U.S. patent application number 17/450424 was filed with the patent office on 2022-03-03 for breathing assistance apparatus.
The applicant listed for this patent is Fisher & Paykel Healthcare Limited. Invention is credited to Dean Antony BARKER, Russel William BURGESS, Jae Chul HAN, Peter Geoffrey HAWKINS, Cameron Alexander LAWRENCE, Joel Michael LAWSON, Eamonn Bernard MCKNIGHT, Ella Marie MEISEL, Rachel Adeline MILLER, Kevin Peter O'DONNELL, Andrew Paul Maxwell SALMON, Andre VAN SCHALKWYK.
Application Number | 20220062578 17/450424 |
Document ID | / |
Family ID | |
Filed Date | 2022-03-03 |
United States Patent
Application |
20220062578 |
Kind Code |
A1 |
VAN SCHALKWYK; Andre ; et
al. |
March 3, 2022 |
BREATHING ASSISTANCE APPARATUS
Abstract
An apparatus for delivering a flow of gas has a housing and a
humidifier. The housing has a recess for a motor and/or sensor
module, an outlet port for a flow of gas, and a removable elbow for
a flow of gas. The humidifier has a heater, a chamber bay for
receipt of a liquid chamber, and a lever and/or detent(s) for
assisting with insertion and/or retention and/or removal of the
liquid chamber in and/or from the chamber bay.
Inventors: |
VAN SCHALKWYK; Andre;
(Auckland, NZ) ; SALMON; Andrew Paul Maxwell;
(Auckland, NZ) ; LAWSON; Joel Michael; (Auckland,
NZ) ; BURGESS; Russel William; (Auckland, NZ)
; LAWRENCE; Cameron Alexander; (Auckland, NZ) ;
MILLER; Rachel Adeline; (Auckland, NZ) ; BARKER; Dean
Antony; (Auckland, NZ) ; HAWKINS; Peter Geoffrey;
(Auckland, NZ) ; MEISEL; Ella Marie; (Auckland,
NZ) ; MCKNIGHT; Eamonn Bernard; (Auckland, NZ)
; O'DONNELL; Kevin Peter; (Auckland, NZ) ; HAN;
Jae Chul; (Auckland, NZ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Fisher & Paykel Healthcare Limited |
Auckland |
|
NZ |
|
|
Appl. No.: |
17/450424 |
Filed: |
October 8, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15739096 |
Dec 21, 2017 |
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PCT/IB2016/053761 |
Jun 24, 2016 |
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17450424 |
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62340910 |
May 24, 2016 |
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62264220 |
Dec 7, 2015 |
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62183889 |
Jun 24, 2015 |
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International
Class: |
A61M 16/16 20060101
A61M016/16; A61M 16/00 20060101 A61M016/00; A61M 16/10 20060101
A61M016/10; A61M 16/06 20060101 A61M016/06 |
Claims
1-54. (canceled)
55. An apparatus for delivering a flow of gas comprising: a
housing; and a removable gasflow tube that defines a gasflow
passage for a flow of gas, wherein the removable gasflow tube
comprises a PCB electrical connector for coupling to a
complementary connector when the gasflow tube is connected to the
housing.
56. The apparatus of claim 55, wherein a first end of the removable
gasflow tube comprises a gas port for coupling with an outlet gas
port on a liquid chamber.
57. The apparatus of claim 56, wherein a second end of the
removable gasflow tube is configured for connection to a patient
breathing conduit.
58. The apparatus of claim 55, wherein the PCB electrical connector
comprises a plurality of connector portions at one end for
engagement with complementary conductors in the complementary
connector, wherein the complementary connector is a female
connector.
59. The apparatus of claim 55, wherein the removable gasflow tube
comprises a female connector for receipt of a complementary male
connector.
60. The apparatus of claim 55, wherein the removable gasflow tube
comprises one or more electrical connectors for coupling to and
powering a heater wire in a patient breathing conduit.
61. The apparatus of claim 60, wherein the one or more electrical
connectors are in electrical communication with connector portions
of the PCB electrical connector.
62. The apparatus of claim 55, wherein the PCB electrical connector
comprises one or more surface mounted temperature sensors.
63. The apparatus of claim 62, wherein the one or more temperature
sensors are in electrical communication with connector portions of
the PCB electrical connector.
64. The apparatus of claim 62, wherein the one or more temperature
sensors are embedded in a body of the gasflow tube.
65. The apparatus of claim 62, wherein the removable gasflow tube
comprises a removable elbow.
66. The apparatus of claim 65, wherein the one or more temperature
sensors are positioned adjacent an interface of a port of the
removable elbow.
67. The apparatus of claim 55, wherein a port of the removable
gasflow tube comprises a T-seal or L-seal,
68. The apparatus of claim 55, wherein a port of the removable
gasflow tube comprises an O-ring.
69. The apparatus of claim 55, wherein electronics of the removable
gasflow tube are sealed from liquid and/or gas ingress.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a flow therapy apparatus
for delivering gas to patients.
BACKGROUND ART
[0002] Breathing assistance apparatuses are used in various
environments such as hospital, medical facility, residential care,
or home environments to deliver a flow of gas to users or
patients.
SUMMARY
[0003] The applicant has identified potential fire or explosion
risk if some gases, such as high concentration oxygen for example,
come into contact with electrical and/or electronics components in
breathing assistance apparatuses.
[0004] The applicant has also identified potential difficulties in
inserting and/or retaining and/or removing a liquid chamber in
and/or from a chamber bay of a breathing assistance apparatus,
particularly for users with limited mobility. Full or correct
insertion and/or retention may be required to ensure that a
satisfactory seal is obtained and maintained between the liquid
chamber and other component(s) that form part of the gasflow
path.
[0005] The applicant has also identified potential difficulties in
keeping components clean and/or sterile when those components are
fixed in the housing of a breathing assistance apparatus.
[0006] Accordingly, it would be desirable to provide an apparatus
for delivering a flow of gas that isolates gas flow from electrical
and/or electronic components.
[0007] Additionally or alternatively, it would be desirable to
provide an apparatus for delivering a flow of gas that has one or
more features that assist with inserting and/or retaining and/or
removing a liquid chamber in and/or from a chamber bay.
[0008] Additionally or alternatively, it would be desirable to
provide an apparatus for delivering a flow of gas that has one or
more removable components to assist with the use, functioning, or
configuration of the apparatus.
[0009] It is an object of one or more of the disclosed embodiments
to provide an apparatus for delivering a flow of gas that has one
or more features that assist with the use, functioning, or
configuration of the apparatus or improves the safety of the
apparatus, or that will at least provide the public or a medical
professional with a useful choice.
[0010] Thus, in accordance with certain features, aspects and
advantages of at least one of the embodiments disclosed herein, an
apparatus for delivering a flow of gas is disclosed, the apparatus
comprising:
a housing with:
[0011] a recess for a motor and/or sensor module, an outlet port
for a flow of gas, and
[0012] a removable elbow for a flow of gas; and
a humidifier with:
[0013] a heater,
[0014] a chamber bay for receipt of a liquid chamber, and
[0015] a lever and/or detent(s) for assisting with insertion and/or
retention and/or removal of the liquid chamber in and/or from the
chamber bay.
[0016] In some configurations, the apparatus comprises a liquid
chamber for receipt in the chamber bay, the liquid chamber
comprising an inlet port connectable to the outlet port, and an
outlet port connectable to the removable elbow. In some
configurations, at least one of the ports comprises one or more
flexible fingers configured to provide positive engagement between
that port and the port to which it is connectable.
[0017] In some configurations, the apparatus comprises a user
interface.
[0018] In some configurations, the chamber bay is formed in the
housing.
[0019] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
a housing with a recess, and an outlet port for a flow of gas,
wherein the recess is defined by at least one wall that is
substantially continuous, gas impermeable, and unbroken, other than
a gasflow passage from the recess to the outlet port of the
housing.
[0020] In some configurations, the recess comprises a recess
opening in an exterior wall of the housing, wherein the recess
extends into the housing from the recess opening. In some
configurations, the recess opening is in a bottom of the housing.
Alternatively, the recess opening could be in a different part of
the housing, such as a side, front, or top of the housing. In some
configurations, the recess opening is in a top of the housing.
[0021] In some configurations, the recess is for receipt of a motor
and/or sensor module.
[0022] In some configurations, the apparatus comprises a motor
and/or sensor module positioned in the recess.
[0023] In some configurations, the apparatus is configured so that
gases enter the housing via the recess and exit the housing via the
outlet port. In some configurations, the gases are delivered by a
gases passage from their entrance to the housing to the outlet
port. In some configurations, the gases passage is provided by the
motor and/or sensor module.
[0024] In some configurations, the motor and/or sensor module
comprises a base, a sensing layer, and a cover layer assembled
together to form a sub-assembly housing. In some configurations,
the sub-assembly housing has a shape that is complementary to a
shape of the recess.
[0025] In some configurations, the motor and/or sensor module
comprises a motor with an impeller, the motor arranged to deliver
gas to the outlet port of the housing. In some configurations, the
motor is positioned on the base of the sub-assembly.
[0026] In some configurations, the base is configured to close the
recess opening when the sub-assembly is positioned in the
recess.
[0027] In some configurations, the sub-assembly is maintained in
position in the recess by fasteners, clips, or a quick release
arrangement.
[0028] In some configurations, the sensing layer comprises a
gasflow path with one or more sensors. In some configurations, the
gasflow path is arranged to deliver gas to the outlet port of the
housing. In some configurations, the gas is or comprises oxygen. In
some configurations, the gas comprises a blend of oxygen and
ambient air.
[0029] In some configurations, the gasflow path comprises an
elongate gasflow portion.
[0030] In some configurations, the gasflow path has a tangential
entrance portion that is located at or adjacent an entrance end of
the elongate gasflow portion.
[0031] In some configurations, the motor and/or sensor module
comprises a gasflow path that comprises a sinuous arrangement.
[0032] In some configurations, the housing comprises electrical
and/or electronic components, and wherein the recess is configured
to isolate the electrical and/or electronic components from gasflow
through or from the motor and/or sensor module. In some
configurations, the gasflow passage is provided by a gasflow
passage tube, wherein the gasflow passage tube extends through an
outer tube that is integrally formed with a portion of the
housing.
[0033] In some configurations, the apparatus is configured so that
if a leak occurs in any of the seals of the motor and/or sensor
module, oxygen will leak to the atmosphere rather than to the
electrical and/or electronic components.
[0034] In some configurations, a seal is provided between part of
the motor and/or sensor module and a wall of the recess, to seal
the module to the housing. In some configurations, the seal
comprises a soft seal such as an O-ring. In some configurations,
the seal is provided between a base of the motor and/or sensor
module and the wall of the recess. In some configurations, the base
supports a motor with an impeller.
[0035] In some configurations, the motor and/or sensor module is
removable from the recess. In some alternative configurations, the
motor and/or sensor module may not be removable from the
recess.
[0036] In some configurations, the motor and/or sensor module
comprises a motor with an impeller and a gases outlet port, and the
gases outlet port is coupled to an inlet port of an adjacent
component by a flexible cuff. In some configurations, the motor
and/or sensor module comprises a cuff support member that is
configured to support the cuff. In some configurations, the cuff
support member comprises an upstanding cuff support member that has
an inwardly concave shape, and that is configured to receive and
support the periphery of the cuff. In some configurations, a gases
outlet port end of the cuff comprises an enlarged diameter that
rests on an upper end of the cuff support member.
[0037] In some configurations, gas that is or comprises oxygen
flows through the gasflow passage and/or the outlet port. In some
configurations, the gas is isolated from electrical and/or
electronics components in the housing. In some configurations, the
gas comprises a blend of oxygen and ambient air.
[0038] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
a motor and/or sensor module for use in the apparatus is disclosed,
the motor and/or sensor module having the feature(s) recited
above.
[0039] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0040] a humidifier with: [0041] a heater, [0042] a chamber bay for
receipt of a liquid chamber, and [0043] a lever for assisting
insertion and/or retention and/or removal of the liquid chamber in
and/or from the chamber bay.
[0044] In some configurations, the lever is configured for
assisting with one of insertion, retention, removal of the liquid
chamber. In some configurations, the lever is configured for
assisting with two of insertion, retention, removal of the liquid
chamber. In some configurations, the lever is configured for
assisting with all three of insertion, retention, removal of the
liquid chamber.
[0045] Different configurations may be configured for assisting
with one, two, or all of insertion, retention, or removal of the
liquid chamber in and/or from the chamber bay.
[0046] In some configurations, the chamber bay comprises opposed
guide features to assist with guiding the liquid chamber into
position in the chamber bay. In some configurations, the opposed
guide features comprise opposed guide rails that are arranged to
interact with an outwardly directed annular flange on a liquid
chamber.
[0047] In some configurations, the lever is configured such that a
liquid chamber can be inserted into or removed from the chamber bay
when the lever is in a first position, and such that the lever
inhibits or prevents removal of a liquid chamber from the chamber
bay when the lever is in a second position.
[0048] In some configurations, the lever comprises at least one
liquid chamber engaging feature to engage with part of the liquid
chamber and drive the liquid chamber into engagement in the chamber
bay when the lever is moved toward the second position. In some
configurations, the apparatus comprises two liquid chamber engaging
features, wherein the liquid chamber engaging features comprise
inwardly directed protrusions.
[0049] In some configurations, the apparatus comprises a positive
engagement feature to retain the handle in the second position.
[0050] In some configurations, the lever comprises a handle portion
to enable the apparatus to be carried when the lever is in a raised
position.
[0051] In some configurations, the lever is pivotally connected to
a housing of the apparatus. In some configurations, only one side
of the lever is pivotally connected to the housing.
[0052] In some configurations, the lever is pivotally and
translationally connected to the housing of the apparatus. In some
configurations, the apparatus comprises a lever retainer that is
fixed to part of the housing, wherein the lever retainer and the
part of the housing together provide pivoting and translational
movement of the lever relative to the housing.
[0053] In some configurations, the lever is configured to move
relative to the housing with a varying radius of movement.
[0054] In some configurations, the lever comprises a first pivot
that is configured to move along a first pivot cavity, and the
lever comprises a second pivot that is configured to move along a
second pivot cavity.
[0055] In some configurations, the first pivot cavity is oriented
in a substantially downward-upward orientation relative to the
housing. In some configurations, the first pivot cavity is
substantially straight.
[0056] In some configurations, the second pivot cavity is oriented
in a substantially forward-rearward direction of the apparatus. In
some configurations, the second pivot cavity is arcuate.
[0057] In some configurations, the apparatus comprises an
engagement feature to retain the second pivot at or adjacent a rear
end of the second pivot cavity, to retain the lever in a raised
position.
[0058] In some configurations, the lever is configured for
assisting with removal of the liquid chamber from the chamber
bay.
[0059] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0060] a humidifier with: [0061] a heater, and [0062] a chamber bay
for a liquid chamber; wherein the apparatus comprises at least one
detent for assisting with insertion and/or retention of the liquid
chamber in the chamber bay.
[0063] In some configurations, the apparatus comprises only one
detent. In some configurations, the apparatus comprises two or more
detents.
[0064] In some configurations, the chamber bay comprises opposed
guide features to assist with guiding the liquid chamber into
position in the chamber bay.
[0065] In some configurations, a detent is provided adjacent one of
the guide features. In some configurations, two detents are
provided adjacent respective guide features.
[0066] In some configurations, a detent is provided on one of the
guide features. In some configurations, two detents are provided on
respective guide features.
[0067] In some configurations, the guide features comprise opposed
guide rails that are arranged to interact with an outwardly
directed annular flange on a liquid chamber, and wherein the
detent(s) comprise(s) enlarged recess(es) in one or both of the
guide rails. In some configurations, one or both of the guide rails
comprise(s) inwardly directed ridge(s). In some configurations, the
inwardly directed ridge(s) has/have sufficient resilience to deform
as the liquid chamber is inserted between the guide rails and/or
removed from the guide rails.
[0068] In some configurations, one or both of the guide features
comprise(s) protrusion(s), wherein the liquid chamber comprises
recess(es) to receive the protrusion(s).
[0069] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0070] a housing and
[0071] a removable gasflow tube that defines a gasflow passage for
a flow of gas, and
a removable retention cover, the removable retention cover
configured such that with the removable retention cover removed
from the housing, the removable gasflow tube can be removed from
the housing, and with the removable retention cover connected to
the housing, the removable gasflow tube cannot be removed from the
housing.
[0072] In some configurations, the housing comprises a retainer for
receipt of the removable gasflow tube, and wherein the removable
retention cover is configured such that with the removable
retention cover removed from the housing, the removable gasflow
tube can be removed from the retainer, and with the removable
retention cover connected to the housing, the removable gasflow
tube cannot be removed from the retainer.
[0073] In some configurations, two discrete actions are required to
remove the removable gasflow tube from the retainer. In some
configurations, the removable retention cover is removable from the
housing by moving the removable cover in a first direction, wherein
the removable gasflow tube is removable from the retainer by moving
the removable gasflow tube in a second direction that is
substantially transverse to the first direction for at least part
of the movement. In some configurations, the removable gasflow tube
comprises a gas port for coupling with an outlet port on a liquid
chamber that is arranged to be received in a chamber bay of the
housing, and the second direction corresponds to a direction of
removal of the liquid chamber from the chamber bay.
[0074] In some configurations, the removable gasflow tube comprises
an electrical connector that is coupled to one or more sensors
and/or power connectors in the removable gasflow tube. In some
configurations, the electrical connector comprises a male connector
portion that projects from a portion of the gasflow tube, wherein
the housing comprises a complementary female connector for receipt
of the male connector when the gasflow tube is connected to the
housing. In some configurations, the housing comprises a male
connector portion and the removable gasflow tube comprises a
complementary female connector for receipt of the male connector
when the gasflow tube is connected to the housing.
[0075] In some configurations, the removable gasflow tube comprises
a port with an axis, and the electrical connector is oriented at an
angle of between about -15 degrees and about +30 degrees relative
to the axis, in some configurations between about 0 degrees and
about +30 degrees relative to the axis, in some configurations
between about 0 degrees and about +15 degrees relative to the axis,
and in some configurations at an angle of about +15 degrees
relative to the axis. In some configurations, the electrical
connector is arranged to be oriented at a non-horizontal angle in
use. In some configurations, the electrical connector is oriented
at a non-parallel and non-coaxial angle relative to the axis. In
some configurations, the electrical connector is oriented an angle
of between about -5 degrees and about -15 degrees relative to the
axis, or between about +5 degrees and about +30 degrees relative to
the axis. In some configurations, the electrical connector is
oriented at an angle of between about +5 degrees and about +30
degrees relative to the axis, in some configurations between about
+5 degrees and about +15 degrees relative to the axis, and in some
configurations at an angle of about +15 degrees relative to the
axis.
[0076] In some configurations, the electrical connector of the
removable gasflow tube is coupled to one or more temperature
sensors to determine temperature of gas flowing through the gasflow
tube.
[0077] In some configurations, the electrical connector of the
removable gasflow tube is coupled to a power connector in the
removable gasflow tube, the power connector for coupling to and
powering heater wire(s) of a patient breathing conduit, the
removable gasflow tube configured to provide a pneumatic and
electrical connection to the patent conduit in a single action when
a patient breathing conduit is connected to the removable gasflow
tube.
[0078] In some configurations, the removable gasflow tube comprises
a removable elbow.
[0079] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
a housing comprising an upper chassis and a lower chassis, a
gasflow passage defined in the housing between the upper and lower
chassis, an electrical component in the housing, and a continuous,
unbroken wall in the housing adapted to pneumatically isolate the
electrical component from the gasflow passage.
[0080] In some configurations, gas that is or comprises oxygen
flows through the gasflow passage. In some configurations, the gas
is isolated from the electrical component. In some configurations,
the gas comprises a blend of oxygen and ambient air.
[0081] In some configurations, the apparatus comprises a motor with
an impeller to deliver gas through the gasflow passage, wherein the
motor is pneumatically isolated from the electrical component. In
some configurations, the wall, either alone, or in combination with
one or more additional continuous unbroken walls, defines a recess
which is pneumatically isolated from the electrical component,
wherein the motor is positioned in the recess.
[0082] In some configurations, the motor is removable from the
recess.
[0083] In some configurations, pressure is lower upstream of the
motor impeller and pressure is higher downstream of the motor
impeller, and the motor comprises an electrical connection that is
positioned upstream of the motor impeller, in the lower pressure
region.
[0084] In some configurations, the electrical component comprises a
printed circuit board.
[0085] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0086] a housing and a lever, wherein only one side of the lever is
movably connected to the housing.
[0087] In some configurations, the apparatus comprises a heater and
a chamber bay for receipt of a liquid chamber.
[0088] In some configurations, when the lever is in a raised
position, liquid tube(s) can be fed through a space between the
lever and the housing.
[0089] In some configurations, said one side of the lever is
pivotally connected to the housing.
[0090] In some configurations, when the lever is in a closed
position, the lever encloses a portion of the chamber bay.
[0091] In some configurations, said one side of the lever is
pivotally and translationally connected to the housing.
[0092] In some configurations, when the lever is in a closed
position, a portion of the lever projects sufficiently above a
floor of the chamber bay that it prevents a liquid chamber from
being removed from the chamber bay.
[0093] In some configurations, said one side of the lever is
pivotally and translationally connected to the housing.
[0094] In some configurations, the apparatus comprises a lever
retainer that is fixed to part of the housing, wherein the lever
retainer and the part of the housing together provide pivoting and
translational movement of the lever relative to the housing.
[0095] In some configurations, the lever is configured to move
relative to the housing with a varying radius of movement.
[0096] In some configurations, the lever comprises a first pivot
that is configured to move along a first pivot cavity, and wherein
the lever comprises a second pivot that is configured to move along
a second pivot cavity.
[0097] In some configurations, the first pivot cavity is oriented
in a substantially downward-upward orientation relative to the
housing. In some configurations, the first pivot cavity is
substantially straight.
[0098] In some configurations, the second pivot cavity is oriented
in a substantially forward-rearward direction of the apparatus. In
some configurations, the second pivot cavity is arcuate.
[0099] In some configurations, the apparatus comprises an
engagement feature to retain the second pivot at or adjacent a rear
end of the second pivot cavity, to retain the lever in a raised
position.
[0100] In some configurations, the lever comprises an arm on said
one side of the lever, wherein the arm is pivotally, or pivotally
and translationally, connected to the housing. In some
configurations, the lever comprises a cross-member that is
connected to the arm.
[0101] In some configurations, there is a space between the housing
and the cross-member on a side of the lever opposite to the arm,
when the lever is in a raised position.
[0102] In some configurations, a terminal end of the lever is
arranged to be positioned generally above a centre of mass of the
apparatus, when the lever is in a fully raised position.
[0103] In some configurations, the lever comprises one or more
features for guiding liquid tube(s) to a liquid chamber.
[0104] In some configurations, the lever is configured for
assisting insertion and/or retention and/or removal of the liquid
chamber in and/or from the chamber bay.
[0105] In some configurations, the lever is gas injection
moulded.
[0106] In some configurations, the lever comprises an external
seal.
[0107] In some configurations, a face of the lever bears against a
face of the housing throughout movement of the lever from a fully
lowered position to a fully raised position.
[0108] In some configurations, the lever and/or housing comprise
one or more magnets to retain the lever in a fully lowered and/or
fully raised position.
[0109] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0110] a housing with a recess in an external wall of the housing,
and
[0111] a connector arrangement positioned in the recess, wherein
the connector arrangement comprises one or more ports, and wherein
the port(s) is/are at a non-horizontal and non-vertical angle
between 0 degrees and 90 degrees relative to a vertical axis.
[0112] That is, the port(s) face at least partly downwardly so that
the insertion angle of plug(s) into the connector(s) is at least
partly upward.
[0113] In some configurations, the port(s) is/are at an angle of
between about 5 degrees and about 30 degrees relative to the
vertical axis. In some configurations, the port(s) is/are at an
angle of between about 10 degrees and about 20 degrees relative to
the vertical axis. In some configurations, the port(s) is/are at an
angle of about 15 degrees relative to the vertical axis.
[0114] In some configurations, a wall of the recesses is angled
relative to the vertical direction at an insertion angle of the
port(s).
[0115] In some configurations, one or more port(s) comprises
communication port(s). In some configurations, one or more port(s)
comprises USB port(s).
[0116] In some configurations, a lip is provided on the or each
port to reduce the likelihood of water ingress into the
port(s).
[0117] In some configurations, the apparatus comprises a sharp edge
or a liquid deflector along an upper edge of the recess, to
encourage liquid to drop off the sharp edge/liquid deflector rather
than running into the recess.
[0118] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0119] a housing;
[0120] and a removable gasflow tube for a flow of gas, wherein the
removable gasflow tube comprises a port with an axis, and an
electrical connector for coupling to a complementary connector when
the gasflow tube is connected to the housing, wherein the
electrical connector is oriented at an angle of between about -15
degrees and about +30 degrees relative to the axis.
[0121] In some configurations, the electrical connector is oriented
at an angle of between about 0 degrees and about +30 degrees
relative to the axis, in some configurations between about 0
degrees and about +15 degrees relative to the axis, and in some
configurations at an angle of about +15 degrees relative to the
axis.
[0122] In some configurations, the electrical connector is arranged
to be oriented at a non-horizontal angle in use.
[0123] In some configurations, the electrical connector is oriented
at a non-parallel and non-coaxial angle relative to the axis. In
some configurations, the electrical connector is oriented an angle
of between about -5 degrees and about -15 degrees relative to the
axis, or between about +5 degrees and about +30 degrees relative to
the axis. In some configurations, the electrical connector is
oriented at an angle of between about +5 degrees and about +30
degrees relative to the axis, in some configurations between about
+5 degrees and about +15 degrees relative to the axis, and in some
configurations at an angle of about +15 degrees relative to the
axis.
[0124] In some configurations, the removable gasflow tube comprises
a removable elbow.
[0125] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0126] a housing;
[0127] and a removable gasflow tube for a flow of gas, wherein the
removable gasflow tube comprises an electrical connector for
coupling to a complementary connector when the gasflow tube is
connected to the housing, wherein a body of the removable gasflow
tube is overmoulded onto the electrical connector.
[0128] In some configurations, the removable gasflow tube comprises
power connector(s) that is/are embedded in part of the overmoulded
gasflow tube body. In some configurations, the power connector
comprises upwardly projecting pin connectors for coupling to and
powering heater wire(s) in a patient breathing conduit. In some
configurations, the pin connectors extend substantially parallel to
a longitudinal axis of a gases outlet port of the elbow.
[0129] In some configurations, the electrical connector comprises a
PCB electrical connector.
[0130] In some configurations, the removable gasflow tube comprises
a removable elbow.
[0131] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0132] a housing;
[0133] and a removable gasflow tube for a flow of gas, wherein the
removable gasflow tube defines a gasflow passage and comprises an
internal pool region in communication with the gasflow passage to
allow pooling of liquid.
[0134] In some configurations, the pool region is provided by an
enlarged region in the gasflow passage.
[0135] In some configurations, the enlarged region is a recess in a
horizontal portion of the gasflow passage.
[0136] In some configurations, the gasflow tube comprises
temperature sensor(s) located adjacent the pool region, the
temperature sensor(s) arranged to determine a temperature that is
representative of the gasflow passage and/or a gases
characteristic.
[0137] In some configurations, the temperatures sensor(s) is/are
used to estimate the humidity of the gases.
[0138] In some configurations, the removable gasflow tube comprises
a removable elbow. In some configurations, the pool region is
provided at an interface of a first and second port of the
elbow.
[0139] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0140] a housing;
[0141] and a removable gasflow tube that defines a gasflow passage
for a flow of gas, wherein the removable gasflow tube comprises a
PCB electrical connector for coupling to a complementary connector
when the gasflow tube is connected to the housing.
[0142] In some configurations, a first end of the removable gasflow
tube comprises a gas port for coupling with an outlet gas port on a
liquid chamber. In some configurations, a second end of the
removable gasflow tube is configured for connection to a patient
breathing conduit.
[0143] In some configurations, the PCB electrical connector portion
comprises a plurality of connector portions at one end for
engagement with complementary conductors in a female connector.
Alternatively, in some configurations the removable gasflow tube
comprises a female connector for receipt of a complementary male
connector.
[0144] In some configurations, the removable gasflow tube comprises
one or more electrical connectors for coupling to and powering a
heater wire in a patient breathing conduit. In some configurations,
the electrical connectors are in electrical communication with
connector portions of the PCB electrical connector.
[0145] In some configurations, the PCB electrical connector
comprises surface mounted temperature sensor(s). The temperature
sensor(s) may be thermocouple(s), digital temperature sensor(s), or
thermistor(s) for example. In some configurations, the temperature
sensor(s) are in electrical communication with connector portions
of the PCB electrical connector. In some configurations, the
temperature sensor(s) is/are embedded in a body of the gasflow
tube.
[0146] In some configurations, the removable gasflow tube comprises
a device that is configured to provide functionality including one
or more of identification, calibration functionality, or
information capture. In some configurations, the device is
configured to provide information including one or more of:
tracking data, how long the removable gasflow tube has been used,
when the removable gasflow tube was first used, determine removable
gasflow tube age (e.g. based on manufacturing date), how many times
the removable gasflow tube has been used, determine and log
connection/disconnection of removable gasflow tube, determine if
disinfection has occurred, how many times the removable gasflow
tube has been disinfected, time of use since last disinfection,
when the removable gasflow tube should be disinfected, power
levels, unique ID, calibration, when the removable gasflow tube
should be replaced. In some configurations, the removable gasflow
tube may have a specified usage life stored in the device, such as
up to 5 years from manufacture for example. In some configurations,
the removable gasflow tube may have a specified maximum number of
disinfection cycles before the removable gasflow tube should be
replaced stored in the device. For example, the maximum number of
disinfection cycles may be a specified number of disinfection
cycles per week, for a specified number of weeks. For example, for
a removable gasflow tube having a maximum usage life of one year,
the maximum number of disinfection cycles may be 52 cycles; one
cycle per week for one year. As another example, for a removable
gasflow tube having a maximum usage life of 5 years, the maximum
number of disinfection cycles may be 260 cycles; one cycle per week
for five years.
[0147] In some configurations, the device comprises one or more of
a microprocessor, memory, or microprocessor with integrated memory.
In some configurations, the device is an EEPROM. In some
configurations, the device could be a flash memory or some other
type of memory. In some configurations, the device may be
configured to store functionality data or may be configured to
communicate the functionality data to a controller of the apparatus
via the connector portions or via a suitable wireless transmission
protocol such as WI-FI, Bluetooth, or GSM for example.
[0148] In some configurations, a port of the removable gasflow tube
comprises a T-seal or L-seal. In some configurations, a port of the
removable gasflow tube comprises an O-ring.
[0149] In some configurations, electronics of the removable gasflow
tube are sealed from liquid and/or gas ingress. In some
configurations, the electronics are sealed by potting for
example.
[0150] In some configurations, the removable gasflow tube comprises
a removable elbow. In some configurations, the temperature
sensor(s) is/are positioned adjacent an interface of a first and
second port of the elbow.
[0151] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0152] a motor and/or sensor module, the module comprising a motor
with an impeller and a gases outlet port, and an outlet gasflow
path and sensing layer, the sensing layer having a sensing and
gasflow path, the sensing and gasflow path comprising a gasflow
inlet port for receiving gases from the gases outlet port, and a
gasflow outlet port;
[0153] wherein a pressure drop coefficient from the gases outlet
port to the gasflow path and sensing layer gasflow outlet port is
between about 5 mPa (L min.sup.-1).sup.-2 and about 50 mPa (L
min.sup.-1).sup.-2.
[0154] In some configurations, the pressure drop coefficient is
between about 10 mPa (L min.sup.-1).sup.-2 and about 20 mPa (L
min.sup.-1).sup.-2. In some configurations, the pressure drop
coefficient is about 15 mPa (L min.sup.-1).sup.-2.
[0155] In some configurations, the gases outlet port is coupled to
the gasflow inlet port by a flexible cuff. In some configurations,
the motor and/or sensor module comprises a cuff support member that
is configured to support the cuff. In some configurations, the cuff
support member comprises an upstanding cuff support member that has
an inwardly concave shape, and that is configured to receive and
support the periphery of the cuff. In some configurations, a gases
outlet port end of the cuff comprises an enlarged diameter that
rests on the upper end of the cuff support member.
[0156] In some configurations, the motor and/or sensor module is
removable from the recess. In some alternative configurations, the
motor and/or sensor module may not be removable from the
recess.
[0157] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
a motor and/or sensor module for use in the apparatus is disclosed,
the motor and/or sensor module having the feature(s) recited
above.
[0158] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0159] a shroud for receipt of an electrical component, the shroud
configured to at least partly surround and protect the electrical
component, the shroud configured to support the electrical
component but to enable movement of the electrical component in the
shroud in at least one dimension.
[0160] In some configurations, the shroud is configured to enable
movement of the electrical component in one dimension. In some
configurations, the shroud is configured to enable movement of the
electrical component in a first substantially horizontal dimension
or in a second substantially horizontal dimension.
[0161] In some configurations, the shroud is configured to enable
movement of the electrical component in two dimensions. In some
configurations, the shroud is configured to enable movement of the
electrical component in a first substantially horizontal dimension
and in a second substantially horizontal dimension.
[0162] In some configurations, the shroud is configured to enable
movement of the electrical component in three dimensions. In some
configurations, the shroud is configured to enable movement of the
electrical component in a first substantially horizontal dimension,
in a second substantially horizontal dimension, and in a
substantially vertical dimension.
[0163] In some configurations, the shroud is configured to allow
limited movement of the electrical component in at least one
dimension, the limited movement being sufficient to accommodate
tolerance misalignment in components.
[0164] In some configurations, the electrical component is an
electrical connector.
[0165] In some configurations, the shroud is provided in an
apparatus for delivering a flow of gas. In some configurations, the
shroud is provided in a motor and/or sensor module.
[0166] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising: [0167] a housing, [0168] a heater in the
housing, [0169] a chamber bay in the housing for receipt of a
liquid chamber, and [0170] a lever that is movably connected to the
housing, wherein when the lever is in a closed position, the lever
encloses a portion of the chamber bay.
[0171] In some configurations, when the lever in a closed position,
a portion of the lever projects sufficiently above a floor of the
chamber bay that it prevents a liquid chamber from being removed
from the chamber bay.
[0172] In some configurations, only one side of the lever is
movably connected to the housing.
[0173] In some configurations, the lever is pivotally connected to
the housing.
[0174] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0175] a gasflow tube for a flow of gas, the gasflow tube
configured to couple to a gasflow outlet from a flow generator,
wherein the coupling to the gasflow outlet is within an outer tube
that allows venting of gas to atmosphere but that is pneumatically
isolated from an electrical component by a continuous, unbroken
wall.
[0176] In some configurations, the flow generator comprises a motor
with an impeller, wherein the motor is pneumatically isolated from
the electrical component by a continuous unbroken wall.
[0177] In some configurations, the wall, either alone, or in
combination with one or more additional continuous unbroken walls,
defines a recess which is pneumatically isolated from the
electrical component, and wherein the motor is positioned in the
recess.
[0178] In some configurations, pressure is lower upstream of the
motor impeller and pressure is higher downstream of the motor
impeller, and wherein the motor comprises an electrical connection
that is positioned upstream of the motor impeller, in the lower
pressure region.
[0179] In some configurations, coupling between the gasflow tube
and gasflow outlet in the conduit comprises at least one seal
between the gasflow tube, the gasflow outlet, and/or the outer
tube. In some configurations, the at least one seal allows lateral
movement of the gasflow outlet in the outer tube. The seal may
comprise a face seal between the gasflow outlet and the gasflow
tube for example. In some configurations, the at least one seal
allows both lateral and axial movement of the gasflow outlet in the
outer tube. The seal may comprise a bellows seal for example.
Therefore, depending on the configuration, the seal(s) may comprise
an O-ring, T-seal, L-seal, face seal, or foam, for example.
[0180] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0181] a housing comprising an upper chassis and a lower chassis,
and a substantially continuous tongue and groove arrangement
between the upper chassis and lower chassis.
[0182] In some configurations, the upper chassis comprises a left
side wall and a right side wall, and the lower chassis comprises a
left side wall and a right side wall, and tongue and groove
arrangements are provided between the left side walls and right
side walls of the upper chassis and lower chassis.
[0183] In some configurations, the apparatus comprises a chamber
bay for a receipt of a liquid chamber, and a tongue and groove
arrangement is provided between the upper and lower chassis around
substantially the entire perimeter of the chamber bay.
[0184] In some configurations, the apparatus comprises at least one
tongue and groove with a chamfered edge. In some configurations,
the apparatus comprises at least one tongue and groove arrangement
with a space between part of the tongue and part of the groove.
[0185] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0186] a housing,
[0187] a mount for mounting the apparatus to a stand or pole,
and
[0188] a projection that is configured to cause the apparatus to
lean towards the stand or pole when mounted thereto.
[0189] In some configurations, the mount comprises a tongue, and
the projection is provided on the tongue.
[0190] In some configurations, the bump is configured to cause the
apparatus to lean in towards the stand by a suitable angle, such as
1-15.degree., or 1-10.degree., or 1-7.degree., or 1-5.degree., or
1-2.degree. for example.
[0191] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0192] a housing, and
[0193] a mount for mounting the apparatus to a stand or pole,
wherein the mount is integrally formed with part of the
housing.
[0194] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0195] a housing, and
[0196] a gasflow tube that defines a gasflow passage for a flow of
gas, wherein the gasflow tube comprises a T-seal or an L-seal to
assist with sealing a port of the gasflow tube to another
component.
[0197] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0198] a housing,
[0199] a recess in the housing for receipt of a motor and/or sensor
module, and
[0200] a component for providing functionality to the apparatus and
that is securable to the housing, wherein the component comprises a
retention feature that is arranged to extend under a base of the
motor and/or sensor module to maintain the motor and/or sensor
module in position in the recess in the housing.
[0201] In some configurations, the component comprises a battery
that is securable to the housing. In some configurations, the
battery comprises a base flange or other projecting feature that is
arranged to extend under a base of the motor and/or sensor module.
In some configurations, the component comprises a different
functional component.
[0202] Additionally, in accordance with certain features, aspects
and advantages of at least one of the embodiments disclosed herein,
an apparatus for delivering a flow of gas is disclosed, the
apparatus comprising:
[0203] a housing,
[0204] an electrical connector, the electrical connector comprising
a receiving socket in the housing that is arranged to receive a
plug of a power cord by movement of the plug in a first direction,
the electrical connector comprising a retainer to maintain the plug
in engagement with the socket by movement of the retainer in a
second direction that is substantially transverse to the first
direction.
[0205] In some configurations, the second direction is
perpendicular to the first direction. In some configurations, the
first direction is vertical and the second direction is
horizontal.
[0206] Features from one or more embodiments may be combined with
features of one or more other embodiments. Additionally, more than
one embodiment may be used together during a process of respiratory
support of a patient.
[0207] The term "comprising" as used in this specification means
"consisting at least in part of". When interpreting each statement
in this specification that includes the term "comprising", features
other than that or those prefaced by the term may also be present.
Related terms such as "comprise" and "comprises" are to be
interpreted in the same manner.
[0208] It should be understood that alternative embodiments may
comprise any or all combinations of two or more of the parts,
elements or features illustrated, described or referred to in this
specification.
[0209] This invention may also be said broadly to consist in the
parts, elements and features referred to or indicated in the
specification of the application, individually or collectively, and
any or all combinations of any two or more said parts, elements or
features.
[0210] To those skilled in the art to which the invention relates,
many changes in construction and widely differing embodiments and
applications of the invention will suggest themselves without
departing from the scope of the invention as defined in the
appended claims. The disclosures and the descriptions herein are
purely illustrative and are not intended to be in any sense
limiting. Where specific integers are mentioned herein which have
known equivalents in the art to which this invention relates, such
known equivalents are deemed to be incorporated herein as if
individually set forth.
BRIEF DESCRIPTION OF THE DRAWINGS
[0211] Specific embodiments and modifications thereof will become
apparent to those skilled in the art from the detailed description
herein having reference to the figures that follow, of which:
[0212] FIG. 1 shows in diagrammatic form a breathing assistance
apparatus in the form of a flow therapy apparatus.
[0213] FIG. 2 is a front view of the flow therapy apparatus with a
humidifier chamber in position and a raised handle/lever.
[0214] FIG. 3 is a top view corresponding to FIG. 2.
[0215] FIG. 4 is a right side view corresponding to FIG. 2.
[0216] FIG. 5 is a left side view corresponding to FIG. 2.
[0217] FIG. 6 is a rear view corresponding to FIG. 2.
[0218] FIG. 7 is a front left perspective view corresponding to
FIG. 2.
[0219] FIG. 8 is a front right perspective view corresponding to
FIG. 2.
[0220] FIG. 9 is a bottom view corresponding to FIG. 2.
[0221] FIG. 10 shows a first configuration of an air and oxygen
inlet arrangement of the flow therapy apparatus.
[0222] FIG. 11 shows a second configuration of an air and oxygen
inlet arrangement of the flow therapy apparatus.
[0223] FIG. 12 is a transverse sectional view showing further
detail of the air and oxygen inlet arrangement of FIG. 11.
[0224] FIG. 13 is another transverse sectional view showing further
detail of the air and oxygen inlet arrangement of FIG. 11.
[0225] FIG. 14 is a longitudinal sectional view showing further
detail of the air and oxygen inlet arrangement of FIG. 11.
[0226] FIG. 15 is an exploded view of upper and lower chassis
components of a main housing of the flow therapy apparatus.
[0227] FIG. 16 is a front left side perspective view of the lower
chassis of the main housing showing a housing for receipt of a
motor and/or sensor module sub-assembly.
[0228] FIG. 17a is a first underside perspective view of the main
housing of the flow therapy apparatus showing a recess inside the
housing for the motor and/or sensor module sub-assembly.
[0229] FIG. 17b is a second underside perspective view of the main
housing of the flow therapy apparatus showing the recess for the
motor and/or sensor module sub-assembly.
[0230] FIG. 18 is an exploded rear perspective view schematically
showing by way of an arrow the gasflow path through the flow
therapy apparatus.
[0231] FIG. 19 is a perspective view of the motor and/or sensor
sub-assembly, underside of the main housing, and fixed elbow of the
flow therapy apparatus.
[0232] FIG. 20 is an exploded perspective view of components of the
motor and/or sensor sub-assembly schematically showing by way of an
arrow the gasflow path through the sub-assembly.
[0233] FIG. 21 is an underside view of a cover and sensing PCB of
the motor and/or sensor sub-assembly showing the position of
sensors.
[0234] FIG. 22a is a rear perspective view of the flow therapy
apparatus sectioned adjacent the rear edge of the apparatus,
showing the arrangement of a portion of the main housing that
provides the recess for receipt of the motor and/or sensor
sub-assembly.
[0235] FIG. 22b is a view similar to FIG. 22a but sectioned closer
to the front of the apparatus.
[0236] FIG. 22c is a view similar to FIG. 22b but sectioned closer
to the front of the apparatus.
[0237] FIG. 22d is a view similar to FIG. 22c but sectioned closer
to the front of the apparatus.
[0238] FIG. 22e is a view similar to FIG. 22d but sectioned closer
to the front of the apparatus.
[0239] FIG. 22f is a view similar to FIG. 22e but sectioned closer
to the front of the apparatus.
[0240] FIG. 23 is a front left side perspective view of a liquid
chamber for use in the flow therapy apparatus.
[0241] FIG. 24 is a front left side perspective view of some of the
components of the flow therapy apparatus.
[0242] FIG. 25 is a view similar to FIG. 24, but with a removable
elbow retention cover removed from the main housing.
[0243] FIG. 26a is an overhead perspective view of the removable
elbow retention cover of FIG. 25.
[0244] FIG. 26b is an underside perspective view of the removable
elbow retention cover of FIG. 25.
[0245] FIG. 27 is an overhead perspective view of the removable
elbow when attached to the main housing.
[0246] FIG. 28 is a perspective view of the removable elbow.
[0247] FIG. 29 is a sectional view of the removable elbow showing
electrical components and a gasflow path.
[0248] FIG. 30 is an exploded view showing the removable elbow
disconnected from an electrical connector of the main housing.
[0249] FIG. 31 shows an exemplary electrical connector for use in
the main housing.
[0250] FIG. 32 is an exploded view showing a connector guard of the
electrical connector of FIGS. 30 and 31.
[0251] FIG. 33 is a front perspective view of the flow therapy
apparatus showing a first configuration humidifier bay for receipt
of a humidifier chamber, with a handle/lever in a raised
position.
[0252] FIG. 34 is a view similar to FIG. 33 but with the humidifier
chamber positioned partly in the humidifier bay and located by
guide rails.
[0253] FIG. 35 is a view similar to FIG. 34 with the handle/lever
partly lowered to move the humidifier chamber further into
engagement in the humidifier bay.
[0254] FIG. 36 is a view similar to FIG. 35 with the handle/lever
further lowered.
[0255] FIG. 37 is a view similar to FIG. 36 with the handle/lever
nearly fully lowered.
[0256] FIG. 38 is a view similar to FIG. 37 with the handle/lever
fully lowered and engaged with a retaining feature.
[0257] FIG. 39 is a front overhead perspective view of the flow
therapy apparatus showing a second configuration humidifier bay for
receipt of the humidifier chamber, having an alternative
configuration of guide rails with detents for locating the chamber
in the humidifier bay, and with the handle/lever being configured
for assisting with removal of the liquid chamber from the chamber
bay.
[0258] FIG. 40 is a front overhead perspective view of the left
side guide rail and detent.
[0259] FIG. 41 is a front overhead perspective view of the right
side guide rail and detent.
[0260] FIG. 42 is an overhead perspective view of a retaining
feature for engaging the handle/lever in a lowered or closed
position.
[0261] FIG. 43 is a front overhead perspective view of the left
side of the apparatus of FIGS. 39 to 42 showing the humidifier
chamber engaged with the detent.
[0262] FIG. 44 is a front overhead perspective view of the
apparatus of FIGS. 39 to 43, showing an alternative configuration
handle/lever in a raised position.
[0263] FIG. 45 is a front overhead perspective view of the
apparatus of FIG. 44, showing the handle/lever in a lowered or
closed position.
[0264] FIG. 46 is a front overhead perspective view of the left
side of the apparatus of FIG. 44, showing detail of the
handle/lever.
[0265] FIG. 47 is a front overhead perspective view of the left
side of the apparatus of FIG. 44, showing exemplary pivot detail of
the handle/lever.
[0266] FIG. 48 is a front overhead perspective view showing detail
of the handle/lever pivots.
[0267] FIG. 49 is a front overhead perspective view of the left
side of the apparatus of FIG. 44, with the handle/lever in a raised
position.
[0268] FIG. 50 is a front overhead perspective view of the
apparatus of FIG. 44, showing a chamber positioned in the
humidifier bay and with the handle/lever in a raised position.
[0269] FIG. 51 shows the chamber positioned beneath the guide rails
in the apparatus of FIG. 44.
[0270] FIG. 52 is a front overhead perspective view of the
apparatus of FIG. 44 with the chamber positioned beneath the guide
rails and the handle/lever in the completely lowered or closed
position.
[0271] FIG. 53 is a view of a user interface display of the flow
therapy apparatus of any one of the preceding figures.
[0272] FIG. 54 is a longitudinal sectional view of the user
interface display of FIG. 53 showing a button configuration.
[0273] FIG. 55 is a front overhead perspective view of the flow
therapy apparatus showing an alternative configuration
handle/lever, with the handle/lever in a lowered or closed
position.
[0274] FIG. 56 is a view corresponding to FIG. 55, but with the
handle/lever in a partly raised position.
[0275] FIG. 57 is a view corresponding to FIG. 55, but with the
handle in a fully raised or opened position, and with a liquid
chamber positioned in the chamber bay.
[0276] FIG. 58 is a right side view of the flow therapy apparatus,
but with the handle/lever in a partly raised position, and with a
liquid chamber positioned in the chamber bay.
[0277] FIG. 59 is a view corresponding to FIG. 55, but with a
liquid chamber positioned in the chamber bay.
[0278] FIG. 60 is a longitudinal cross-sectional view of the flow
therapy apparatus of FIGS. 55 to 59, showing the pivot mounting of
the handle/lever to the main housing when the handle/lever is in
the lowered or closed position.
[0279] FIG. 61 is a view corresponding to FIG. 60, but with the
handle/lever in a partly raised position.
[0280] FIG. 62 is a view corresponding to FIG. 60, but with the
handle/lever in the fully raised or opened position.
[0281] FIG. 63 is a cross-sectional perspective view with the
handle/lever in the position of FIG. 61.
[0282] FIG. 64 is a view corresponding to FIG. 63 but with the
handle/lever in the fully raised or opened position of FIG. 62.
[0283] FIG. 65 is a view of the motor for use in the motor and/or
sensor module sub-assembly of FIGS. 19-21 or FIGS. 78-101.
[0284] FIG. 66 is a side perspective view of an alternative
removable elbow for use in the flow therapy apparatuses, the elbow
shown removed from the main housing.
[0285] FIG. 67 is a front/side perspective view of the removable
elbow of FIG. 66.
[0286] FIG. 68 is a rear underside perspective view of the
removable elbow of FIG. 66.
[0287] FIG. 69 is a partial cross-sectional view of the removable
elbow of FIG. 66.
[0288] FIG. 70 is an overhead perspective view of a PCB electrical
connector of the removable elbow of FIG. 66.
[0289] FIG. 71 is an overhead plan view of the PCB electrical
connector of FIG. 70.
[0290] FIG. 72 is a side perspective view of another alternative
removable elbow for use in the flow therapy apparatuses, the elbow
shown removed from the main housing.
[0291] FIG. 73 is a rear underside perspective view of the
removable elbow of FIG. 72.
[0292] FIG. 74 is a front/side perspective view of the removable
elbow of FIG. 72.
[0293] FIG. 75 is an overhead plan view of a PCB electrical
connector of the removable elbow of FIG. 72.
[0294] FIG. 76 is a partial front overhead perspective view of a
carrier for the display and user interface module, the carrier
being part of the main housing of one of the flow therapy
apparatuses, with an elbow receiver configured for receipt of the
removable elbow of FIG. 66 or 72.
[0295] FIG. 77 is a front overhead perspective view of the carrier
and elbow receiver of FIG. 76.
[0296] FIG. 78 is a perspective view of the motor and/or sensor
sub-assembly for use in the flow therapy apparatuses.
[0297] FIG. 79 is a perspective view of the base of the motor
and/or sensor sub-assembly of FIG. 78.
[0298] FIG. 80 is another perspective view of the base of the motor
and/or sensor sub-assembly of FIG. 79.
[0299] FIG. 81 is an overhead perspective view of the base of FIGS.
79 and 80 assembled with the motor/blower unit.
[0300] FIG. 82 is another overhead perspective view of the base and
motor/blower unit of FIG. 81.
[0301] FIG. 83 is a bottom view of the base of the motor and/or
sensor sub-assembly of FIG. 78.
[0302] FIG. 84 is a perspective view of the motor and/or sensor
sub-assembly of FIG. 78, with part of the cover layer not shown,
and showing a coupling tube or cuff.
[0303] FIG. 85 is a perspective view of a mid-section of the motor
and/or sensor sub-assembly of FIG. 78, and schematically showing an
upper part of the gasflow path from the cover layer.
[0304] FIG. 86 is a top view of parts of the mid-section of FIG.
85.
[0305] FIG. 87 is an overhead perspective view of the parts of FIG.
86.
[0306] FIG. 88 is an overhead perspective view of an outlet gasflow
path and sensing layer of the motor and/or sensor sub-assembly of
FIG. 78, which forms a lower part of a gasflow path.
[0307] FIG. 89 is an underside perspective view of the cover layer
of the motor and/or sensor sub-assembly of FIG. 78, which forms an
upper part of a gasflow path.
[0308] FIG. 90 is a rear overhead perspective view of the
mid-section of the motor and/or sensor sub-assembly of FIG. 78 with
a PCB in place, and schematically showing an upper part of the
gasflow path from the cover layer.
[0309] FIG. 91 is a rear overhead perspective view of the
mid-section of the motor and/or sensor sub-assembly of FIG. 78
without the PCB in place.
[0310] FIG. 92 is an underside perspective view of the outlet
gasflow path and sensing layer of the motor and/or sensor
sub-assembly of FIG. 78.
[0311] FIG. 93 is a top view of a cover layer of the motor and
sensor sub-assembly of FIG. 78.
[0312] FIG. 94 is an overhead perspective view of the cover layer
of FIG. 92.
[0313] FIG. 95 is an underside view of the cover layer of FIG.
93.
[0314] FIG. 96 is a schematic view of a sealing arrangement between
a gas outlet port of the motor and/or sensor sub-assembly of FIG.
78 and a portion of the housing of the flow therapy apparatus of
FIG. 1.
[0315] FIG. 97 shows the gasflow path through the motor and/or
sensor sub-assembly of FIG. 78.
[0316] FIG. 98 is another overhead perspective view of the motor
and/or sensor sub-assembly of FIG. 78.
[0317] FIG. 99 is a schematic view of a sealing arrangement for the
PCB of the motor and/or sensor sub-assembly of FIG. 78.
[0318] FIG. 100 is an overhead perspective view of the PCB of the
motor and/or sensor sub-assembly of FIG. 78.
[0319] FIG. 101 is a front overhead perspective view of a flow
therapy apparatus showing an alternative configuration handle/lever
arrangement, with the handle/lever in a lowered or closed
position.
[0320] FIG. 102 is an exploded front overhead perspective view of
some of the components of the apparatus of FIG. 101.
[0321] FIG. 103 is an exploded underside perspective view of some
of the components of the apparatus of FIG. 101.
[0322] FIG. 104 is an exploded overhead perspective view of some of
the components of the apparatus of FIG. 101.
[0323] FIG. 105 is a left side view of some of the components of
the handle/lever arrangement of the apparatus of FIG. 101.
[0324] FIG. 106 is a left side view similar to FIG. 105, but
showing movement paths of the pivots of the handle/lever.
[0325] FIG. 107 is an overhead perspective view showing the
handle/lever of the apparatus of FIG. 101.
[0326] FIG. 108 is a left side view of part of the apparatus of
FIG. 101, with the handle/lever in a substantially lowered or
closed position.
[0327] FIG. 109 is a view corresponding to FIG. 108, with the
handle/lever in a partly raised position.
[0328] FIG. 110 is a view corresponding to FIG. 108, with the
handle/lever in a further raised position.
[0329] FIG. 111 is a view corresponding to FIG. 108, with the
handle/lever in a fully raised position.
[0330] FIG. 112 is a detail view of part of the handle/lever
arrangement of FIG. 101, showing detail of a step feature in a
pivot cavity for the front pivot of the handle/lever
arrangement.
[0331] FIG. 113 is a plot showing the movement path of a terminal
end of the handle/lever arrangement of the apparatus of FIG.
101.
[0332] FIG. 114 is a view showing an alternative configuration
second pivot cavity to that of FIGS. 106 and 108 to 112.
[0333] FIG. 115 is a left side sectional view showing details of
the handle/lever arrangement of the apparatus of FIG. 101, with the
handle/lever in a partly raised position.
[0334] FIG. 116 is a view corresponding to FIG. 115, with the
handle/lever in a fully raised position.
[0335] FIG. 117 is a left front overhead perspective view of the
apparatus of FIG. 101, showing the handle/lever in a partly raised
position.
[0336] FIG. 118 is a front overhead perspective view showing the
housing, elbow arrangement, and removable retention cover of the
apparatus of FIG. 101.
[0337] FIG. 119 is a front underside view showing details of the
removable retention cover of FIG. 118.
[0338] FIG. 120 is a right front overhead perspective view showing
the housing and an alternative removable retention cover of the
apparatus of FIG. 101, with the retention cover removed from the
housing.
[0339] FIG. 121 is a view similar to FIG. 120, but showing the
retention cover engaged with the housing.
[0340] FIG. 122 is an overhead perspective view of an electrical
connector arrangement of the apparatus of FIG. 101.
[0341] FIG. 123 is another overhead perspective view of the
electrical connector arrangement of FIG. 122.
[0342] FIG. 124 is a bottom perspective view of the electrical
connector arrangement of FIG. 122.
[0343] FIG. 125 is an overhead perspective view of the electrical
connector arrangement of FIG. 122, showing the steps of coupling a
power cord to the socket.
[0344] FIG. 126 is a perspective view of part of the interior of
the apparatus of FIG. 101, showing a power harness guide.
[0345] FIG. 127 is a perspective view of the power harness guide of
FIG. 126.
[0346] FIG. 128 is a perspective view of the power harness guide
from the opposite side to FIG. 127.
[0347] FIG. 129 is a bottom rear perspective view of a region of
the housing of the apparatus of FIG. 101 that receives the power
cord.
[0348] FIG. 130 is an overhead front perspective view from the
interior of the housing, showing a region of the housing
corresponding to that of FIG. 129.
[0349] FIG. 131 is a side cross-sectional view through a USB
connector arrangement of the apparatus of FIG. 101.
[0350] FIG. 132 is a rear perspective view of the apparatus of FIG.
101, showing a battery pack and the USB connector arrangement of
FIG. 131.
[0351] FIG. 133 is a side perspective view of the apparatus of FIG.
101, showing an integral mount to mount the apparatus to a pole or
stand.
[0352] FIG. 134 is a schematic side perspective view of the
apparatus of FIG. 101 mounted to a pole or stand.
[0353] FIG. 135 is a perspective view of a PCB electrical connector
of the apparatus of FIG. 101, the connector having an over-moulded
collar.
[0354] FIG. 136 is a front overhead perspective view of the lower
chassis of the apparatus of FIG. 101, showing exemplary placements
of the PCB electrical connector of FIG. 135.
[0355] FIG. 137 is a side view of the removable elbow of FIG. 72,
with a T-seal in place on the elbow.
[0356] FIG. 138 is a cross-sectional view of the T-seal shown in
FIG. 137, when not in place on the elbow.
[0357] FIG. 139 is a schematic cross-sectional view of part of the
T-seal of FIGS. 137 and 138, showing exemplary dimensions.
[0358] FIG. 140 is a perspective view of an alternative
configuration removable elbow and alternative configuration T-seal
for use in the flow therapy apparatuses.
[0359] FIG. 141 is a cross-sectional perspective view of the
removable elbow and T-seal of FIG. 140.
[0360] FIG. 142 is a perspective view of an alternative
configuration removable elbow and adapted T-seal that resembles an
L-seal for use in the flow therapy apparatuses.
[0361] FIG. 143 is a cross-sectional perspective view of the
removable elbow and seal of FIG. 142.
[0362] FIG. 144 shows an inlet port of the removable elbow coupled
to the outlet port of a liquid chamber, showing a mechanical
standoff feature.
[0363] FIG. 145 is a rear underside perspective view of an
alternative configuration of the lower chassis of the flow therapy
apparatus of FIG. 101 in the region where the electrical connector
is located.
[0364] FIG. 146 is an underside perspective view of a retainer of
the electrical connector of FIG. 145.
[0365] FIG. 147 is an overhead view of the retainer of FIG.
146.
[0366] FIG. 148 is a front side overhead perspective view of an
alternative configuration inlet elbow for use in the flow therapy
apparatuses.
[0367] FIG. 149 is a rear underside perspective view of the inlet
elbow of FIG. 148.
[0368] FIG. 150 is a front perspective view of the inlet elbow of
FIGS. 148 and 149, showing a one-way valve.
[0369] FIG. 151 is a front overhead perspective view of an
alternative lower chassis of the flow therapy apparatus of FIG.
101, showing tongue and/or groove features.
[0370] FIG. 152 is another front overhead perspective view of the
lower chassis of FIG. 151, showing tongue and/or groove
features.
[0371] FIG. 153 is a rear underside perspective view of an
alternative upper chassis of the flow therapy apparatus of FIG.
101, showing tongue and/or groove features.
[0372] FIG. 154 is a front underside perspective view of the upper
chassis of FIG. 153, showing tongue and/or groove features.
[0373] FIG. 155 is a side partial cross-sectional view of the flow
therapy apparatus of FIG. 101 with the upper and lower chassis of
FIGS. 151 to 154, showing locations of tongue and groove
arrangements.
[0374] FIG. 156 is a view of detail D156 showing the tongue and
groove arrangement in the region of the battery.
[0375] FIG. 157 is a view of detail D157 showing the tongue and
groove arrangement.
[0376] FIG. 158 is a view of detail D158 showing the tongue and
groove arrangement.
[0377] FIG. 159 is a view of detail D159 showing the tongue and
groove arrangement.
[0378] FIG. 160 is view of detail D160 of the tongue and groove
arrangement in the region of the communication connector
arrangement.
[0379] FIG. 161 is a schematic view of one configuration of tongue
and groove arrangement for use in the flow therapy apparatuses.
[0380] FIG. 162 is a schematic view of another configuration of
tongue and groove arrangement for use in the flow therapy
apparatuses.
[0381] FIG. 163 is a rear view of the apparatus of FIG. 101,
showing a larger battery in place on the rear of the apparatus.
[0382] FIG. 164 is an underside rear perspective view the apparatus
with the battery shown in FIG. 163, showing an overlap between a
base flange of the battery and the motor and/or sensor module.
[0383] FIG. 165 is a side perspective view of an alternative
removable elbow for use in the flow therapy apparatuses.
[0384] FIG. 166 is an underside view of the removable elbow of FIG.
165.
[0385] FIG. 167 is an overhead perspective view of a PCB electrical
connector of the removable elbow of FIG. 166.
[0386] FIG. 168 is a plan view of the PCB electrical connector of
FIG. 167.
[0387] FIG. 169 is a partly transparent overhead perspective view
of the removable elbow of FIG. 165, showing some details of the PCB
electrical connector.
[0388] FIG. 170 is a partly transparent overhead perspective view
of the removable elbow of FIG. 165 showing alternative details of
the PCB electrical connector.
[0389] FIG. 171 is a partly transparent overhead perspective view
of the removable elbow of FIG. 165 showing alternative details of
the PCB electrical connector.
[0390] FIG. 172 is a partly transparent overhead perspective view
of the removable elbow of FIG. 165 showing alternative details of
the PCB electrical connector.
[0391] FIG. 173 is an overhead perspective view of a carrier for
the display and user interface module, the carrier being part of
the main housing of one of the flow therapy apparatuses.
[0392] FIG. 174 is an underside perspective view of the carrier of
FIG. 173.
[0393] FIG. 175 is an underside perspective view of a removable
retention cover for use with the carrier of FIGS. 173 and 174.
[0394] FIG. 176 is a perspective view of a flexible tether for
coupling the removable retention cover of FIG. 175 to the carrier
of FIGS. 173 and 174.
[0395] FIG. 177 is a perspective view of the motor and/or sensor
sub-assembly for use in the flow therapy apparatuses.
[0396] FIG. 178 is an overhead perspective view of the base of the
motor and/or sensor sub-assembly.
[0397] FIG. 179 is an overhead perspective view of the base and
mid-section of the motor and/or sensor sub-assembly.
[0398] FIG. 180 is an underside of the mid-section of the motor
and/or sensor sub-assembly.
[0399] FIG. 181 is a perspective view of the mid-section of the
motor and/or sensor sub-assembly.
[0400] FIG. 182 is an overhead perspective view of the cover layer
of the motor and/or sensor sub-assembly.
[0401] FIG. 183 is a partial exploded view of some of the
components of the motor and/or sensor sub-assembly.
[0402] FIG. 184 is a perspective view of a patient breathing
conduit arrangement that utilises a T-seal or L-seal.
[0403] FIG. 185 shows an inner part of a connector of the patient
breathing conduit arrangement of FIG. 184.
[0404] FIG. 186 is a partly transparent view of the connector of
the patient breathing conduit arrangement of FIGS. 184 and 185.
DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS
1. Introduction
[0405] A flow therapy apparatus 10 is shown in FIG. 1. In general
terms, the apparatus 10 comprises a main housing 100 that contains
a flow generator 11 in the form of a motor/impeller arrangement, an
optional humidifier 12, a controller 13, and a user I/O interface
14 (comprising, for example, a display and input device(s) such as
button(s), a touch screen, or the like). The controller 13 is
configured or programmed to control the components of the
apparatus, including: operating the flow generator 11 to create a
flow of gas (gasflow) for delivery to a patient, operating the
humidifier 12 (if present) to humidify and/or heat the generated
gasflow, receive user input from the user interface 14 for
reconfiguration and/or user-defined operation of the apparatus 10,
and output information (for example on the display) to the user.
The user could be a patient, healthcare professional, or anyone
else interested in using the apparatus.
[0406] A patient breathing conduit 16 is coupled to a gasflow
output 344 in the housing 100 of the flow therapy apparatus 10, and
is coupled to a patient interface 17 such as a nasal cannula with a
manifold 19 and nasal prongs 18. Additionally, or alternatively,
the patient breathing conduit 16 could be coupled to a face mask.
Additionally or alternatively, the patient breathing conduit could
be coupled to a nasal pillows mask, and/or a nasal mask, and/or a
tracheostomy interface, or any other suitable type of patient
interface. The gasflow, which may be humidified, that is generated
by the flow therapy apparatus 10 is delivered to the patient via
the patient breathing conduit 16 through the cannula 17. The
patient breathing conduit 16 can have a heater wire 16a to heat
gasflow passing through to the patient. The heater wire 16a is
under the control of the controller 13. The patient breathing
conduit 16 and/or patient interface 17 can be considered part of
the flow therapy apparatus 10, or alternatively peripheral to it.
The flow therapy apparatus 10, breathing conduit 16, and patient
interface 17 together form a flow therapy system.
[0407] General operation of a flow therapy breathing apparatus 10
will be known to those skilled in the art, and need not be
described in detail here. However, in general terms the controller
13 controls the flow generator 11 to generate a gasflow of the
desired flow rate, controls one or more valves to control the mix
of air and oxygen or other alternative gas, and controls the
humidifier 12 if present to humidify the gasflow and/or heat the
gasflow to an appropriate level. The gasflow is directed out
through the patient breathing conduit 16 and cannula 17 to the
patient. The controller 13 can also control a heating element in
the humidifier 12 and/or the heating element 16a in the patient
breathing conduit 16 to heat the gas to a desired temperature that
achieves a desired level of therapy and/or comfort for the patient.
The controller 13 can be programmed with or can determine a
suitable target temperature of the gasflow.
[0408] Operation sensors 3a, 3b, 3c, 20, 25 such as flow,
temperature, humidity, and/or pressure sensors can be placed in
various locations in the flow therapy apparatus 10 and/or the
patient breathing conduit 16 and/or cannula 17. Output from the
sensors can be received by the controller 13, to assist it to
operate the flow therapy apparatus 10 in a manner that provides
optimal therapy. In some configurations, providing optimal therapy
includes meeting a patient's inspiratory demand. The apparatus 10
may have a transmitter and/or receiver 15 to enable the controller
13 to receive 8 signals from the sensors and/or to control the
various components of the flow therapy apparatus 10, including but
not limited to the flow generator 11, humidifier 12, and heater
wire 16a, or accessories or peripherals associated with the flow
therapy apparatus 10. Additionally, or alternatively, the
transmitter and/or receiver 15 may deliver data to a remote server
or enable remote control of the apparatus 10.
[0409] The flow therapy apparatus 10 may be any suitable type of
apparatus, but in some configurations may deliver a high gasflow or
high flow therapy (of e.g. air, oxygen, other gas mixture, or some
combination thereof) to a patient to assist with breathing and/or
treat breathing disorders. In some configurations, the gas is or
comprises oxygen. In some configurations, the gas comprises a blend
of oxygen and ambient air. `High flow therapy` as used in this
disclosure may refer to delivery of gases to a patient at a flow
rate of greater than or equal to about 10 liters per minute (10
LPM). In some configurations, `high flow therapy` may refer to the
delivery of gases to a patient at a flow rate of between about 10
LPM and about 100 LPM, or between about 15 LPM and about 95 LPM, or
between about 20 LPM and about 90 LPM, or between about 25 LPM and
about 85 LPM, or between about 30 LPM and about 80 LPM, or between
about 35 LPM and about 75 LPM, or between about 40 LPM and about 70
LPM, or between about 45 LPM and about 65 LPM, or between about 50
LPM and about 60 LPM. Gases delivered may comprise a percentage of
oxygen. In some configurations, the percentage of oxygen in the
gases delivered may be between about 20% and about 100%, or between
about 30% and about 100%, or between about 40% and about 100%, or
between about 50% and about 100%, or between about 60% and about
100%, or between about 70% and about 100%, or between about 80% and
about 100%, or between about 90% and about 100%, or about 100%, or
100%.
[0410] High flow therapy has been found effective in meeting or
exceeding the patient's inspiratory demand, increasing oxygenation
of the patient and/or reducing the work of breathing. Additionally,
high flow therapy may generate a flushing effect in the nasopharynx
such that the anatomical dead space of the upper airways is flushed
by the high incoming gas flows. This creates a reservoir of fresh
gas available of each and every breath, while minimising
re-breathing of carbon dioxide, nitrogen, etc.
[0411] The patient interface may be a non-sealing interface to
prevent barotrauma (e.g. tissue damage to the lungs or other organs
of the respiratory system due to difference in pressure relative to
the atmosphere). The patient interface may be a nasal cannula with
a manifold and nasal prongs, and/or a face mask, and/or a nasal
pillows mask, and/or a nasal mask, and/or a tracheostomy interface,
or any other suitable type of patient interface.
[0412] As shown in FIGS. 2 to 54 and described below, the flow
therapy apparatus 10 has various features to assist with the
functioning, use, and/or configuration of the apparatus 10.
2. Overview Including Main Housing Description
[0413] As shown in FIGS. 2 to 18, the flow therapy apparatus 10
comprises a main housing 100. The main housing 100 has a main
housing upper chassis 102 and a main housing lower chassis 202.
[0414] The main housing upper chassis 102 has a peripheral wall
arrangement 106. The peripheral wall arrangement defines a
humidifier or liquid chamber bay 108 for receipt of a removable
liquid chamber 300. The removable liquid chamber 300 contains a
suitable liquid such as water for humidifying gases that will be
delivered to a patient.
[0415] In the form shown, the peripheral wall arrangement 106 of
the main housing upper chassis 102 comprises a substantially
vertical left side outer wall 110 that is oriented in a
front-to-rear direction of the main housing 100, a substantially
vertical left side inner wall 112 that is oriented in a
front-to-rear direction of the main housing 100, and an
interconnecting wall 114 that extends between and interconnects the
upper ends of the left side inner and outer walls 110, 112. The
main housing upper chassis 102 further comprises a substantially
vertical right side outer wall 116 that is oriented in a
front-to-rear direction of the main housing 100, a substantially
vertical right side inner wall 118 that is oriented in a
front-to-rear direction of the main housing 100, and an
interconnecting wall 120 that extends between and interconnects the
upper ends of the right side inner and outer walls 116, 118. The
interconnecting walls 114, 120 are angled towards respective outer
edges of the main housing 100, but could alternatively be
substantially horizontal or inwardly angled.
[0416] The main housing upper chassis 102 further comprises a
substantially vertical rear outer wall 122. An upper part of the
main housing upper chassis 102 comprises a forwardly angled surface
124. The surface 124 has a recess 126 for receipt of a display and
user interface module 14 shown in more detail in FIGS. 53 and 54.
An interconnecting wall 128 extends between and interconnects the
upper end of the rear outer wall 122 and the rear edge of the
surface 124.
[0417] A substantially vertical wall portion 130 extends downwardly
from a front end of the surface 124. A substantially horizontal
wall portion 132 extends forwardly from a lower end of the wall
portion 130 to form a ledge. A substantially vertical wall portion
134 extends downwardly from a front end of the wall portion 132 and
terminates at a substantially horizontal floor portion 136 of the
liquid chamber bay 108. The left side inner wall 112, right side
inner wall 118, wall portion 134, and floor portion 136 together
define the liquid chamber bay 108. The floor portion 136 of the
liquid chamber bay 108 has a recess 138 to receive a heater
arrangement such as a heater plate 140 or other suitable heating
element(s) for heating liquid in the liquid chamber 300 for use
during a humidification process.
[0418] The floor portion 136 of the liquid chamber bay 108
terminates short of the front edge of the left side inner wall 112
and the right side inner wall 118 to form a downwardly extending
lip 142. The lip 142 forms part of a recess for receiving a handle
portion 506 of a lever 500 for use in assisting with insertion of
the liquid chamber 300, as will be described further below. The
liquid chamber bay 108 further comprises opposed guide features in
the form of left side and right side horizontally extending guide
rails 144, 146 which extend toward a centre of the bay 108 from the
respective left and right side inner walls 112, 118 to assist with
guiding the liquid chamber 300 into position in the bay 108 as will
be described in detail below.
[0419] The main housing lower chassis 202 is attachable to the
upper chassis 102, either by suitable fasteners or integrated
attachment features such as clips for example. The main housing
lower chassis 202 comprises a substantially vertical left side
outer wall 210 that is oriented in a front-to-rear direction of the
main housing 100 and is contiguous with the left side outer wall
110 of the upper chassis 102, and a substantially vertical right
side outer wall 216 that is oriented in a front-to-rear direction
of the main housing 100 and is contiguous with the right side outer
wall 116 of the upper chassis 102. The main housing lower chassis
202 further comprises a substantially vertical rear outer wall 222
that is contiguous with the rear outer wall 122 of the upper
chassis 102.
[0420] The lower housing chassis 202 has a lip 242 that is
contiguous with the lip 142 of the upper housing chassis 102, and
also forms part of the recess for receiving the handle portion 506
of the lever 500. The lower lip 242 comprises a forwardly directed
protrusion 243 that acts as a retainer for the handle portion 506
of the lever 500.
[0421] An underside of the lower housing chassis 202 comprises a
bottom wall 230. Respective interconnecting walls 214, 220, 228
extend between and interconnect the substantially vertical walls
210, 216, 222 and the bottom wall 230. The bottom wall 230
comprises a grill 232 comprising a plurality of apertures to enable
drainage of liquid in case of leakage from the liquid chamber 300
(e.g. from spills). The bottom wall 230 additionally comprises
elongated forward-rearward oriented slots 234. The slots 234
additionally enable drainage of liquid in case of leakage from the
liquid chamber 300, without the liquid entering the electronics
housing. In the illustrated configuration, the heater plate 140 is
not supported by outer portions of the bottom wall 230, and so the
slots 234 can be wide and elongate relative to the apertures of the
grill 232 to maximize the drainage of liquid.
[0422] As shown in FIGS. 17a to 22f, the lower chassis 202 has a
motor recess 250 for receipt of a removable motor and/or sensor
module 400 which is shown in FIGS. 19 to 21 and will be described
in further detail below. A recess opening 251 is provided in the
bottom wall 230 adjacent a rear edge thereof, for receipt of a
removable motor/sensor module 400 which is shown in FIGS. 19 and 21
and FIGS. 22b to 22f and will be described in further detail below.
A continuous, gas impermeable, unbroken peripheral wall 252 is
integrally formed with the bottom wall 230 of the lower chassis 202
and extends upwardly from the periphery of the opening 251. A
rearward portion 254 of the peripheral wall 252 has a first height,
and a forward portion 256 of the peripheral wall 252 has a second
height that is greater than the first height. The rearward portion
254 of the peripheral wall 252 terminates at a substantially
horizontal step 258, which in turn terminates at an upper auxiliary
rearward portion 260 of the peripheral wall 252. The forward
portion 256 and upper auxiliary rearward portion 260 of the
peripheral wall 252 terminate at a ceiling 262. All of the walls
and the ceiling 262 are continuous, gas impermeable, and unbroken
other than the gasflow passage. As can be seen most clearly in FIG.
22f, the tube 264 forming the gasflow passage is integrally formed
with the ceiling 262, with the ceiling surrounding and extending
outwardly from the tube 264. Therefore, the entire motor recess 250
is gas impermeable and unbroken, other than the gasflow
passage.
[0423] As shown in FIG. 22f, the tube 264 forming the gasflow
passage extends upwardly through a downward outer extension tube or
conduit 133 that is integrally formed with the ledge 132 in the
upper housing chassis 102. The tube 264 extends at least as far as
the ledge 132, and may extend to a point where it is vertically
higher than the ledge 132. A soft seal such as an O-ring seal (not
shown) is located between the exterior of the gasflow passage tube
264 and the interior of the downward outer extension tube 133, to
provide a seal between the components when assembled. In other
configurations, the gasflow passage tube 264 and the downward
extension tube 133 could be configured to be fitted together via an
interference or press fit arrangement while still providing for a
seal between the components when assembled. Still other
configurations including but not limited to latch/catch-style
fittings and bayonet-style fittings between the gasflow passage
tube 264 and the downward extension tube 133 are contemplated. The
tube 264 terminates beneath the cover 150 which will be described
in further detail below.
[0424] The configuration is such that if there is any leaking of
gas from the motor or gasflow path following the motor via any
seals, the gas will vent to atmosphere rather than ingressing into
the interior of the main housing that contains the control boards
and other electrical components as described below. The electrical
components and electronics boards in the housing are pneumatically
isolated from the gasflow path. The only way for gas to leak into
the portion of the main housing 100 that contains the electronics
boards and other electrical components will be if there is a
physical crack in the housing 100 or another physical component.
The pressure in the motor of the motor and/or sensor module 400
upstream of the impeller may be lower than the pressure in the
portion of the main housing 100 that contains the
electrical/electronic components, which also assists with any gas
leaks venting to atmosphere.
[0425] There will be a pressure drop in the gasflow as it moves
through the system due to the formation of gas turbulence and due
to friction (e.g. as gas passes along walls defining the gas
passages).
[0426] If there is a failure (e.g. crack) in the housing defining
the motor and/or sensor module 400, the leak (to atmosphere) at the
failure would more greatly decrease the pressure of gases
downstream (e.g. in the portion of the main housing 100 that
contains electrical/electronic components), which mitigates the
probability or severity of leak to electrical/electronic components
if additional failures are encountered downstream.
[0427] In the motor and/or sensor module 400, the pressure is lower
before/upstream of the motor impeller, and the pressure is higher
after/downstream of the motor impeller. An electrical connection
will be provided for the motor upstream of the motor impeller, in
the lower pressure region. If there is a failure in the housing in
the portion near the electrical connection, air will be sucked into
the low pressure side.
[0428] In an alternative configuration, the motor recess comprising
items 252, 254, 256, 258, 260, 264 may be separately formed from
the lower chassis 202. The motor assembly including the recess may
be insertable into the recess opening 251 and attachable to the
lower chassis 202. Upon insertion of the motor assembly and recess
into the lower chassis 202, the gasflow passage tube 264 will
extend through the downward extension tube 133 and be sealed by the
soft seal.
[0429] In the form shown, the recess 250 comprises a recess opening
in a bottom wall of the housing. Alternatively, the recess opening
could be in a different part of the housing, such as a side, front,
or top of the housing.
[0430] The described configuration provides a chamber shaped to
receive a removable motor and/or sensor module 400 as described
below with reference to FIGS. 19 and 20. The interior wall of the
recess 250 (including but not limited to portions of the peripheral
wall 252) may be provided with guides and/or mounting features to
assist with locating and/or attaching the module 400 in the recess
250. The removable motor and/or sensor module 400 is a flow
generator and comprises a motor 402 with an impeller that operates
as a blower to deliver gases to the patient interface 17 via the
liquid chamber 300. It will be appreciated that the shape of the
chamber can vary depending on the shape of the motor/sensor module
400. However, the chamber will be provided with continuous, gas
impermeable, and unbroken walls and a ceiling to isolate the
gasflow from electrical and electronic components in the main
housing 100.
[0431] With reference to FIG. 23, the removable liquid chamber 300
comprises an outer housing 302 defining a liquid reservoir, a
liquid chamber gases inlet port 306 in fluid communication with the
liquid reservoir, and a liquid chamber gases outlet port 308 in
fluid communication with the liquid reservoir. A baffle 304 is
provided internally in the liquid reservoir to define a flow path
of gases through the liquid chamber 300. A lower edge of the liquid
chamber 300 comprises an outwardly directed annular flange 310
which interacts with the guide rails 144, 146 in the chamber bay
108 for locating and retaining the liquid chamber 300 in the
chamber bay 108. The flange 310 extends outwardly from the base of
a peripheral wall 312 of the liquid chamber 300. A bottom wall of
the liquid chamber 300 is heat conducting and is adapted for
resting on the heater plate 140 for heating liquid in the liquid
chamber 300.
[0432] The apparatus 10 comprises a connection manifold arrangement
320 for fluid coupling of the liquid chamber 300 to the apparatus
10. The liquid chamber 300 can be fluidly coupled to the apparatus
10 in a linear slide-on motion in a rearward direction of the
liquid chamber 300 into the chamber bay 108, from a position at the
front of the housing 100 in a direction toward the rear of the
housing 100. The connection manifold arrangement 320 comprises a
manifold gases outlet port 322 that is in fluid communication, via
a fixed L shaped elbow 324, with the gasflow passage from the
motor/impeller unit 402. As shown in FIG. 22f, the lower portion
325 of the elbow 324 that forms a gasflow inlet port of the elbow
extends downwardly into the interior of the gasflow passage tube
264, preferably to a position below the lower end of the gasflow
passage tube 264. A soft seal such as an O-ring seal is provided
between the exterior of the lower portion 325 and the interior of
the gasflow passage tube 264 to seal between those components.
[0433] The connection manifold arrangement 320 further comprises a
manifold gases inlet port 340 (humidified gases return) that is
embodied in a removable elbow 342. The removable elbow 342 is
L-shaped, and further comprises a patient outlet port 344 for
coupling to the patient breathing conduit 16 to deliver gases to
the patient interface 17. The manifold gases outlet port 322,
manifold gases inlet port 340, and patient outlet port 344 each
comprise soft seals such as O-ring seals (not shown) to provide a
sealed gases passageway between the apparatus 10, the liquid
chamber 300, and the patient breathing conduit 16.
[0434] The liquid chamber gases inlet port 306 is complementary
with the connection manifold gases outlet port 322, and the liquid
chamber gases outlet port 308 is complementary with the connection
manifold gases inlet port 340. The axes of those ports are
preferably parallel to enable the liquid chamber 300 to be inserted
into the chamber bay 108 in a linear movement.
[0435] The apparatus 10 has air and oxygen (or alternative
auxiliary gas) inlets in fluid communication with the motor 402 to
enable the motor 402 to deliver air, oxygen, or a suitable mixture
thereof to the liquid chamber 300 and thereby to the patient. In
some configurations, the gas comprises a blend of oxygen and
ambient air. As shown in FIG. 10 the apparatus 10 may have a
combined air/oxygen (or alternative auxiliary gas) inlet
arrangement 350. This arrangement comprises a combined air/oxygen
port 352 into the housing 100, a filter 354, and a cover 356 with a
laterally extending oxygen tube 358 that is in fluid communication
with an oxygen source. The port 352 is fluidly coupled with the
motor 402. For example, the port 352 may be coupled with the motor
and/or sensor module 400 via a gasflow passage between the port 352
and an inlet aperture or port in the motor and/or sensor module
400, which in turn would lead to the motor. This arrangement may be
of the type described in patent application US 2014/0345615, and
the contents of that specification are incorporated herein in their
entirety by way of reference.
[0436] Alternatively, the apparatus 10 may have the arrangement
shown in FIGS. 11 to 14 to enable the motor 402 to deliver air,
oxygen (or alternative auxiliary gas), or a suitable mixture
thereof to the liquid chamber 300 and thereby to the patient. This
arrangement comprises an air inlet 356' in the rear wall 222 of the
lower chassis 202 of the housing 100. The air inlet 356' comprises
a rigid plate with a suitable grill arrangement of apertures and/or
slots. Sound dampening foam may be provided adjacent the plate on
the interior side of the plate. An air filter box 354' is
positioned adjacent the air inlet 356' internally in the main
housing 100, and comprises an air outlet port 360 to deliver
filtered air to the motor 402 via an air inlet port 404 in the
motor and/or sensor module 400. The air filter box 354' may
comprise a filter configured to remove particulates (e.g. dust)
and/or pathogens (e.g. viruses or bacteria) from the gasflow. A
soft seal such as an O-ring seal will be provided between the air
outlet port 360 and air inlet port 404 to seal between the
components. The apparatus 10 comprises a separate oxygen inlet port
358' positioned adjacent one side of the housing 100 at a rear end
thereof, the oxygen port 358' for receipt of oxygen from an oxygen
source such as a tank or source of piped oxygen. The oxygen inlet
port 358' is in fluid communication with a proportional oxygen
valve 362. The oxygen valve 362 will suitably be a solenoid valve
that enables the control of the amount of oxygen that is added to
the gasflow that is delivered to the liquid chamber 300. It should
be understood that in alternative configurations the oxygen port
358' and proportional oxygen valve 362 may be used with other
auxiliary gases to control the addition of other auxiliary gases to
the gasflow. The other auxiliary gases may comprise any one or more
of a number of gases useful for gas therapy, including but not
limited to heliox and nitric oxide.
[0437] As shown in FIGS. 13 to 16 and 22b to 22f, the lower housing
chassis 202 carries suitable electronics boards 272 such as printed
circuit boards. The electronics boards are positioned adjacent
respective outer side walls 210, 216 of the lower housing chassis
202. The electronics boards 272 contain, or are in electrical
communication with, suitable electrical or electronics components
such as but not limited to microprocessors, capacitors, resistors,
diodes, operational amplifiers, comparators, and switches. Sensors
may be used. Components of the electronics boards 272 (such as but
not limited to one or more microprocessors) act as the controller
13 of the apparatus.
[0438] One or both of the electronics boards 272 are in electrical
communication with the electrical components of the apparatus 10,
including the display unit and user interface 14, motor 402, oxygen
valve 362, and the heater plate 140 to operate the motor 402 to
provide the desired flow rate of gas, operate the humidifier 12 to
humidify and heat the gasflow to an appropriate level, and supply
appropriate quantities of oxygen (or in alternative configurations
quantities of an alternative auxiliary gas) to the gasflow.
[0439] The electronics boards 272 are in electrical communication
with a connector arrangement 274 projecting from the rear wall 122
of the upper housing chassis 102. The connector arrangement 274 may
be coupled to a nurse alarm, pulse oximetry port, and/or other
suitable accessories. The electronics boards 272 are also in
electrical communication with an electrical connector 276 that is
also provided in the rear wall 122 of the upper housing chassis 102
to provide mains or battery power to the components of the
apparatus 10. The electronics boards 272 are also in electrical
communication with an electrical connector 278 for the removable
elbow 342, the purpose of which will be described in more detail
below.
[0440] As mentioned above, operation sensors, such as flow,
temperature, humidity, and/or pressure sensors can be placed in
various locations in the flow therapy apparatus 10 and/or the
patient breathing conduit 16 and/or cannula 17. The electronics
boards 272 will be in electrical communication with those sensors.
Output from the sensors can be received by the controller 13, to
assist the controller 13 to operate the flow therapy apparatus 10
in a manner that provides optimal therapy, including meeting
inspiratory demand.
[0441] As outlined above, the electronics boards 272 and other
electrical and electronic components are pneumatically isolated
from the gasflow path, thereby reducing or avoiding any fire or
explosion risk that could otherwise occur if there was not that
isolation.
[0442] Various aspects of the device will now be described in more
detail.
3. Motor and/or Sensor Module
[0443] FIGS. 19 to 22f show the removable motor and/or sensor
module or sub-assembly 400 in greater detail. As discussed above,
the lower chassis 202 comprises a recess 250 for receipt of the
motor and/or sensor module 400.
[0444] In the form shown in FIGS. 19 to 21, the motor and/or sensor
module 400 comprises a stacked arrangement of three main
components; a base 403 of the sub-assembly 400 (on which is
positioned the motor 402), an outlet gasflow path and sensing layer
420 positioned above the base 403, and a cover layer 440. The base
403, the sensing layer 420, and the cover layer 440 assemble
together to form a sub-assembly housing that has a shape that is
complementary to that of the recess 250 so that the sub-assembly
400 can be received in the recess 250. The base 403 is configured
to close the recess opening 251 when the sub-assembly 400 is
positioned in the recess 250. The sub-assembly 400 may be
maintained in position in the recess in any suitable way such as
with fasteners, clips, or a quick release arrangement for
example.
[0445] The sensing layer comprises a gasflow path with one or more
sensors, the gasflow path arranged to deliver gas to the outlet
port of the housing.
[0446] The motor 402 has a body 408 that defines an impeller
chamber that contains an impeller. The motor 402 could be any
suitable gas blower motor, and may for example be a motor and
impeller assembly of the type described in published PCT
specification WO2013/009193 and shown in FIG. 65 for example. The
contents of that specification are incorporated herein in their
entirety by way of reference.
[0447] A plurality of vibration isolation structures 412 are
located in spaced apart positions around the periphery of the body
408. The vibration isolation structures 412 are configured to
absorb vibrations caused by movement of the impeller or of other
components of the motor 402 during operation. The absorption of
vibrations can mitigate rattling of the motor 402 inside of the
sub-assembly housing, which in turn can reduce noise emitted by the
motor 402. The absorption of vibrations can also mitigate material
fatigue on various components of the sub-assembly 400. The
vibration isolation structures 412 may be constructed from a
silicone material. In other configurations, other resilient
materials including but not limited to acrylic resins and
polyurethane resins might be used. In the form shown, the vibration
isolation structures 412 comprise upright plastic posts with
resilient cylindrical sleeves positioned over the posts. The
vibration isolation structures are mounted to the body 408 and are
received in recesses in the base and the sensor layers.
Alternatively, the arrangement could be reversed. In another
alternative, a mounting post could be provided on each of the base
and sensor layers, with the posts mating against or connecting to
each other in the resilient sleeve. In other configurations, the
vibration isolation structures 412 could be in a different form.
For example, in alternative configurations, the vibration isolation
structures 412 might comprise one or more overmoulded features on
the body 408. In still other alternative configurations, the
vibration isolation structures 412 might comprise one or more
springs, resilient structures (e.g. nipples, protrusions, blocks,
sheets, etc), or foam structures (e.g. encapsulations, `ring`-like
fittings around the periphery of the body 408, etc) affixed to one
or more sides of the body 408. In still other configurations, inner
walls of the base 403 and/or sensing layer 420 might comprise
vibration isolation structures that vibrationally isolate the body
408.
[0448] A gases outlet 406 is in fluid communication with a gases
inlet of the outlet gasflow path and sensing layer 420, which is
stacked on top of the motor. This layer 420 comprises a body 422
which comprises a plurality of mounting legs 425 that can be
inserted into a plurality of mounting slots (not shown) of the base
403 to secure the body 422 to the base 403. In other
configurations, other structures or arrangements may be used to
secure the body 422 to the base 403, including but not limited to
fasteners, clips, or quick release arrangements. In one
configuration, the body 422 defines a gasflow path that couples the
gases outlet 406 with the gases inlet of the gasflow path and
sensing layer 420. An alternative configuration such as but not
limited to a coupling tube could be used to couple the gases outlet
406 with that gases inlet.
[0449] The body 422 defines a lower portion 426 of a sensing and
gasflow path. The cover layer 440 has a body 442 that defines the
upper portion 446 of the sensing and gasflow path, with the shape
of the upper and lower portions 426, 446 corresponding
substantially to each other.
[0450] As shown in FIGS. 20 and 21, the gasflow path comprises a
linear elongate gasflow portion 428, 448. The inlet is in fluid
communication with a tangential entrance portion 430, 450 of the
gasflow path, which is located at or adjacent an entrance end of
the linear elongate portion 428, 448 of the gasflow path. Recesses
433, 453 and 434, 454 may be provided at opposite ends of the
linear elongate portion of the gasflow path.
[0451] A gasflow outlet port 452 extends vertically through the
body 442 of the cover layer 440, and is located at or adjacent an
opposite exit end of the linear elongate portion 428, 448 of the
gasflow path. As shown in FIGS. 22d and 22e for example, the gas
outlet port 452 is in fluid communication with an upper portion of
the motor recess 250, which in turn is in fluid communication with
the gasflow passage. Again, due to the wall 252 and ceiling 262
configuration of the recess 250, if there is gas leakage from the
motor/sensor module 400, that will be vented to atmosphere rather
than entering the portion of the main housing 100 that contains the
bulk of the electronics and control equipment. The recess 250 may
comprise spacer(s), such as lugs that protrude downwardly from
ceiling 262 as shown in FIG. 17b, to maintain a suitable spacing
for gasflow from the gas outlet port 452 and the ceiling of the
recess 262.
[0452] It can be seen from FIG. 20 that that at least part of the
gasflow path through and out of the motor and/or sensing module 400
has a tortuous or sinuous configuration. For example, the direction
of gasflow travel through the elongate portions 428, 448 is
generally opposite to the direction of gasflow travel from the gas
outlet port 452 to the entrance of the gasflow passage through
elbow 324.
[0453] As shown in FIG. 21, the cover layer 440 comprises a sensing
printed circuit board (PCB) 456. The cover layer 440 may also
comprise one or more temperature sensors such as thermistors that
sit in the elongate portion 428, 448 of the gasflow path. One
sensor will measure gas temperature and the other can act as a
redundant temperature sensor. Alternatively, one of the thermistors
could be used as a reference flow sensor (e.g. via use as a
constant-temperature thermistor), and the measured temperatures
could be used to determine the gasflow rate through the portion
428, 448 of the gasflow path. The one or more temperature sensors
may be located on a portion of the sensing PCB 456 that faces the
gasflow. The sensing PCB 456 may additionally comprise other
sensors including but not limited to pressure sensors, humidity
sensors and dew point sensors.
[0454] One or both of the electronics boards 272 will be in
electrical communication or coupled with the sensors to process
information received from the sensors and operate the apparatus 10
based on the information received from the sensors.
[0455] The sensing layer 420 and cover layer 440 comprise
complementary locating features 438, 458 to correctly locate the
layers relative to each other. In the form shown, the locating
features comprise projections 438 and complementary recesses 458;
however, other features could be provided. The base 403, sensing
layer 420 and cover layer 440 (and optionally the motor 402) can be
fastened together using fasteners (e.g. screws) that extend through
apertures of components of the sub-assembly 400. Alternatively, a
different fastening arrangement could be used. For example, the
layers 403, 420, 440 could be adhered or fused together.
[0456] The cover layer 440 has a grid arrangement of vertical walls
on its upper surface to minimise water ingress in the event of
leakage of water from the fixed elbow 324. The grid arrangement may
thus help to prevent water that would have entered the sub-assembly
400 (due to, for example, accidental tilting of a filled liquid
chamber 300 in the chamber bay 108) from entering the gas outflow
port 452 and disrupting electrical components of the sub-assembly
400. In alternative configurations, the upper surface of the cover
layer 440 may define a basin having a bottom wall lower than the
upper portion of the gas outflow port 452 to receive water.
[0457] In an alternative configuration, the motor/impeller unit may
be provided remotely from the apparatus 10. In that configuration,
the module received in the recess 250 may only comprise a gasflow
path and various sensors, to deliver gases to the fixed elbow 324
and thereby to the liquid chamber 300. In an alternative
configuration, the module received in the recess 250 may only
comprise the motor and a gasflow path, but no sensors.
[0458] In another alternative configuration the motor and/or sensor
module 400 may not be removable from the recess 250, but instead
may be permanently mounted therein. The benefits of the gas
isolation from the electrical/electronics components would still be
provided in that configuration.
[0459] The removable motor and/or sensor module allows the module
to be cleaned, and/or replaced if there are any faults. The
removable module allows for a more compact flow path, and a reduced
distance flow path. This reduces resistance to flow since the flow
does not need to travel as far.
[0460] The flow path is compact, and has reduced turns/sharp turns
which reduces flow separation and reduces resistance to flow.
[0461] The arrangement of the motor and flow path provides another
layer of isolation because of the wall arrangement.
[0462] Having a modular motor and/or sensor module enables the
various parts of the module to be taken apart if needed for
cleaning and/or servicing.
[0463] There are advantageously no leak paths in the motor and/or
sensor module. While the motor and/or sensor module may be a
potential leak point, a leak in that region would result in the
oxygen venting to atmosphere or into the liquid chamber.
4. Removable Gasflow Tube or Elbow
[0464] As discussed above, the apparatus 10 comprises a removable
gasflow tube in the form of a removable elbow 342 for receiving
humidified gases from the liquid chamber 300 and directing the
humidified gases toward the patient interface 17 through the
patient breathing conduit 16. The elbow 342 and related features
will now be described with reference to FIGS. 24 to 32. A benefit
of having a removable tube is that the parts in contact with
potential condensation are removable for cleaning, disinfection,
and/or sterilisation.
[0465] The removable elbow 342 is substantially L-shaped and has
the manifold gases inlet port 340 (humidified gases return) and the
patient outlet port 344 for coupling to the patient breathing
conduit 16 to deliver gases to the patient interface 17. As shown
in FIG. 29, the elbow 342 comprises a gasflow passage 364 that
extends through the elbow from the inlet port 340 to the outlet
port 344.
[0466] The upper chassis 102 comprises an elbow retainer 160
extending forwardly from wall 130. The retainer 160 comprises a
base wall 161 and two spaced apart upright side walls 162. Inwardly
directed flanges 163 extend towards each other from the upper ends
of the side walls 162, with a spacing between the flanges 163 being
large enough to enable the patient outlet port 344 to extend
upwardly therebetween. As shown in FIGS. 28, 30, and 32, the body
of the elbow 342 comprises elongate ribs 365 extending transversely
outwardly from opposite sides thereof. The ribs 365 and flanges 163
are advantageously both substantially horizontally orientated. The
ribs 365 and flanges 163 are sized and configured such that the
elbow 342 can be engaged with the elbow retainer 160 by moving the
elbow 342 rearwardly in a horizontal direction. However, once the
elbow 342 is engaged with the elbow retainer 160, it can only be
removed by moving the elbow 342 forwardly in a horizontal
direction. The elbow 342 cannot be lifted upwardly to disengage it
from the elbow retainer 160, because the ribs 365 and flanges 163
will prevent that movement.
[0467] The upper housing chassis 102 comprises a removable
retention cover 150 as shown in FIGS. 25-26b. With the removable
retention cover 150 removed from the upper chassis 102, the elbow
342 can be removed from the elbow retainer 160. With the removable
retention cover 150 connected to the upper chassis 102, the elbow
342 cannot be removed from the elbow retainer 160.
[0468] The retention cover 150 is generally L-shaped in cross
section, and has an upper ceiling portion 151 and a substantially
vertical wall portion 152 extending downwardly from a front edge
thereof. The ceiling portion 151 comprises a recess 153 for receipt
of the patient outlet port 344 of the removable elbow 342. The wall
portion 152 comprises two recesses 154, 155; one for receipt of the
manifold gases outlet port 322 and one for receipt of the manifold
gases inlet port 340 (humidified gases return).
[0469] The retention cover 150 is configured such that it can only
be removed from the upper chassis 102 of the housing 100 by moving
it in a direction that is at least in part substantially transverse
to the removal and insertion direction of the elbow 342. To that
end, opposite sides of the retention cover 150 comprise retainment
features 156 that co-operate with complementary retainment features
170 extending inwardly from the inner walls 112, 118 of the upper
chassis 102. In the form shown, the retainment features 156 in the
cover 150 comprise elongate recesses that extend substantially
vertically, and the retainment features 170 of the upper chassis
102 comprise elongate slats that extend substantially vertically.
Alternatively, the configuration could be reversed such that the
cover 150 comprises the slats and the upper chassis 102 comprises
the recesses. Alternatively one of the components could have a
plurality of projections rather than slats. Preferably, the slats
and recesses are tapered so that upper ends of the recesses and
slats are narrower than their lower ends, to provide positive
engagement of the cover 150 and upper chassis 102.
[0470] If the cover 150 is in position in the housing 100 and the
elbow 342 is in position in the elbow retainer 160, attempting to
pull elbow 342 forward will be unsuccessful, because of engagement
between the retainment features 156, 170 between the retainment
cover 150 and the upper chassis 102. It is necessary to lift the
cover 150 upwardly relative to the housing 100 so that the
retainment features 156, 170 clear each other, at which time the
cover 150 can be removed, and the elbow 342 can be disengaged from
the elbow retainer 160. After cleaning the removable elbow 342, the
elbow 342 can be reengaged with the elbow retainer 160, and the
cover 150 can be moved downwardly relative to the housing 100 to
reengage with the housing 100, and to retain the elbow 342 in
position in the housing 100.
[0471] This configuration has the benefit that two discrete actions
are required to remove the elbow 342 from the housing 100, the
movement of the cover 150 in a first direction to release that from
the housing 100 followed by the movement of the elbow 342 in a
second direction that is transverse to the first direction, to
remove the elbow 342 from the elbow retainer 160. The result is
that a user is unlikely to accidentally disconnect the elbow 342,
but the arrangement enables easy removal and reconnection of the
elbow 342 without the use of fasteners or great force, which is
particularly beneficial for users with limited mobility. This
arrangement is also beneficial where the direction of connection
and disconnection of the liquid chamber 300 with the main housing
100 (and the ports) corresponds to the direction of connection and
disconnection of the elbow 342 and the housing 100. The described
arrangement will prevent accidental removal of the removable elbow
342 as the liquid chamber 300 is removed from the chamber bay
108.
[0472] It will be appreciated that while the movement direction of
the retention cover 150 is shown as being normal or perpendicular
to that of the elbow 342, the same result could be achieved with a
smaller relative angle between the two movements, provided the
movements are at least substantially transverse to one another for
at least part of the movement. Additionally, it will be appreciated
that the first direction of movement of the retention cover 150
does not necessarily need to be vertical. For example, the
retention cover 150 could be removable from the main housing 100
and reconnectable thereto by moving it in a lateral or sideways
direction.
[0473] An electrical connector 366 projects from a rear portion of
the elbow 342 in a direction opposite to that of the gases inlet
port 340. The electrical connector 366 is suitably a printed
circuit board that forms a male connector portion that protrudes
outward from the elbow and that is adapted for receipt in the
female electrical connector 278 in the upper chassis 102. The
electrical connector 366 is advantageously a male connector portion
to avoid difficulties with space constraints in the elbow 342 and
for electrical safety to prevent over-currents. Alternatively, the
electrical connector 366 may be or may comprise a female connector
to receive a complementary male connector. The electrical connector
366 is configured to be in electrical communication with the
electrical connector 276 that is provided in the rear wall 122 of
the upper housing chassis 102 to receive mains or battery power
from the same source as the electrical connector 276. In
alternative configurations, the electrical connector 366 can be
connected to a separate mains or battery power source.
[0474] The connector 366 is coupled to one or more temperature
sensors to determine the temperature of the gas flowing through the
gases inlet port 340. In one configuration, the temperature
sensor(s) may comprise thermistor(s) 367 that is/are coupled to the
electrical connector 366. In an alternative configuration, at least
part of the removable elbow 342 may be a material that is
transparent to infrared wavelengths (such as transparent
polycarbonate for example), and the temperature sensor 367 may
comprise an infrared temperature sensor. This may provide a reduced
number of wires and more accurate sensing. In some alternative
configurations, if part of the removable elbow 342 is of a material
that is transparent to infrared wavelengths, the infrared
temperature sensor 367 may instead be located elsewhere within a
wall of the elbow 342, or may be located within a portion of the
housing 100 proximal to the elbow 342. In an alternative
configuration, digital temperature sensor(s) may be used instead of
thermistor(s).
[0475] In one configuration, the electrical connector 366 is also
coupled to a power connector comprising a pin connector or
inductive power connector 368 for coupling to and powering the
heater wire(s) 3c in the patient breathing conduit. The connector
368 is in the form of a chimney portion. The connector 368 extends
upwardly adjacent to the gasflow outlet 344 and is positioned above
the top of the retention cover 150, and is configured such that
when the patient breathing conduit 16 is pneumatically coupled to
the gasflow outlet, the heater wire 3c electrically couples to the
connector 368 in the same single action.
[0476] The elbow comprises depressions 370 on part of the gasflow
outlet 344 for engagement with complementary protrusions on a
sliding locking collar connected to the heated patient interface
tube 16.
[0477] The electrical connector 366 is electrically coupled to one
or both of the electronics boards 272 via the female electrical
connector 278 and cable 279 which is connected to one of the
electronics boards by a detachable connector 280. This enables the
electronics board(s) 272 to power the sensors and electrical
connector 366 in the removable elbow 342 and receive and process
data from the sensors.
[0478] A connector guard 278a (FIG. 32) may be provided and
fastened to the female connector 278 to minimise the likelihood of
bending pins of the connector, to prevent a user's finger from
touching a live portion of the connector 278, and to assist with
maintaining the female connector in position.
[0479] The removable elbow 342 comprises retainment features 372 on
or adjacent the gases inlet port 340 to positively engage with the
liquid chamber gases outlet port 308. The gases outlet port may
have feature(s) (not shown) that are adapted to accept or interface
with the retainment features 372, such as a lip and/or O-ring seal
for example. In the form shown, the retainment features 372
comprise a plurality of resilient fingers on a portion of the inlet
port 340 adjacent a recess for receipt of an O-ring seal. The
resilient fingers are positioned at discrete locations around the
periphery of the inlet port 340. In the configuration shown, there
are four resilient fingers around the periphery of the inlet port
340, with an even angular spacing between the fingers.
Alternatively, there may be two or more resilient fingers located
with any suitable angular spacing.
[0480] The resilient fingers each comprise a relatively narrow
portion 372a positioned toward an outer end of the gases inlet port
340, and an enlarged head portion 372b positioned further from the
outer end of the gases inlet port 340. It can be seen from FIG. 28
that at least the enlarged heads 372b project transversely outward
beyond a portion of the gases inlet port 340 adjacent the fingers.
The liquid chamber gases outlet port 308 has a cylindrical region
with an internal diameter slightly larger than the outer diameter
of the portion of the gases inlet port 340 adjacent the fingers. As
the gases inlet port 340 is inserted into the liquid chamber gases
outlet port 308, the O-ring seal will initially seal against the
interior of the gases outlet port 308. Upon further insertion, the
fingers 372 will deform inwardly against the interior of the gases
outlet port 308 until they pass a lip in that interior, at which
time the fingers 372 move outward to positively engage against the
lip and minimise the likelihood of accidental removal of the liquid
chamber 300. When the liquid chamber 300 is to be removed from the
apparatus 10, the chamber 300 will need to be moved outwardly with
sufficient force to force the fingers 372 inwardly to clear the
lip.
[0481] The fingers 372 may provide significant resistance against
movement of the liquid chamber 300 inwardly or outwardly. In some
configurations, movement of the chamber 300 into or out of
engagement with the housing 100 may be entirely manual by a user
pushing directly on the liquid chamber 300. In alternative
configurations, the apparatus 10 may be provided with a
handle/lever arrangement as described below, to assist with
engaging and/or disengaging the liquid chamber 300 with/from the
housing 100.
[0482] In the form shown, the manifold gases outlet port 322 is
also shown as having the resilient fingers 372. The engagement and
operation of the resilient fingers 372 with the liquid chamber
gases inlet port 306 will be the same as that described above. In
some configurations, the manifold gases outlet port 322 and
manifold gases inlet port 340 will both have the resilient fingers.
In other configurations, only one of those ports may have the
resilient fingers, as that may be sufficient to minimise the
likelihood of accidental disengagement of the liquid chamber
300.
[0483] In an alternative configuration, the ports on the housing
322, 340 may be larger than the ports 306, 308 on the liquid
chamber 300, so that ports 306, 308 are received within ports 322,
340. Soft seals, such as O-ring seals, will again be provided to
seal between the ports. In that configuration, if resilient fingers
are provided they will be provided on one or both of the ports 306,
308. Alternatively, the resilient fingers could be provided on one
or both of the larger ports, and be inwardly directed to interact
with an outer surface of the smaller port(s). The apparatus 10 may
have any combination of these alternatives.
[0484] In an alternative configuration, snap-fit features, bayonet
connections, or other features may be provided instead of the
resilient fingers.
[0485] Rather than being in the form of an elbow, the gasflow tube
could have any other suitable configuration depending on the
configuration of the apparatus. For example, the gasflow tube could
be substantially linear or a non-liner configuration, with the
manifold gases inlet port 340 and the patient outlet port 344 at
ends of the tube. The inlet and outlet ports will typically be
offset from each other. The direction of insertion and removal of
the gasflow tube into and from the retainer 160 (e.g. forward and
rearward) will be at an angle to the movement direction of the
retention cover 150 as described above. The retainer 160 may be
modified as required, depending on the configuration of the gasflow
tube.
5. Humidifier/Liquid Chamber Bay
[0486] The liquid chamber bay 108 and handle/lever arrangement will
now be described in more detail with reference to FIGS. 33 to
52.
[0487] As discussed, the liquid chamber bay 108 comprises opposed
left side and right side guide rails 144, 146 which extend toward a
centre of the bay 108 from the respective left and right side inner
walls 112, 118. The guide rails 144, 146 assist with guiding the
liquid chamber 300 into position in the bay 108. The guide rails
144, 146 are parallel to the floor 136 of the liquid chamber 300
and/or with the upper surface of the heater plate 140, to enable
the flange 310 of the liquid chamber 300 to slide therebetween.
Insertion of the liquid chamber 300 into the bay 108 is shown in
FIGS. 34 to 38.
[0488] The main housing 100 comprises a handle/lever 500 for
assisting with insertion and/or retention and/or removal of the
liquid chamber 300 in and/or from the chamber bay 108. Different
configurations may be configured for assisting with one, two, or
all of insertion, retention, removal of the liquid chamber 300 in
and/or from the chamber bay 108. One example configuration is
described below with reference to FIGS. 44 to 52.
[0489] The handle/lever 500 is pivotally attached to the main
housing 100, and is movable from a first, raised or open position
shown in FIG. 33 for example to a second, lowered or closed
position shown in FIG. 38 for example. The handle/lever has a left
side arm 502 that is pivotally attached to the left inner side wall
112 of the upper chassis 102, a right side arm 504 that is
pivotally attached to the right inner side wall 118 of the upper
chassis 102, and a cross-member handle portion 506 that
interconnects the free ends of the left and right side arms 502,
504 and forms an engagement region for grasping by a user's
fingers. When the handle 500 is in the raised position, the
cross-member 506 can act as a carrying handle for the apparatus 10.
The liquid chamber 300 can be inserted into or removed from the
chamber bay 108 when the handle/lever 500 is raised. When the
handle/lever 500 is in the lowered position, it inhibits or
prevents removal of the liquid chamber 300 from the chamber bay
108. Because the handle/lever encloses a portion of the chamber bay
when the lever is in the closed or fully lowered position, when the
handle/lever is in the fully raised position, a large space is
created between the cross-member of the handle/lever and the
housing of the apparatus including a large opening at the front of
the chamber bay and around the liquid chamber, allowing easy
insertion and removal of the liquid chamber to and from the chamber
bay because a user's fingers can easily fit between housing walls
and the liquid chamber.
[0490] An example pivot arrangement of the handle/lever 500 is
described below with reference to FIGS. 44 to 51. The pivot
arrangement enables pivotal movement of the handle/lever 500 but
prevents translational movement of the handle/lever.
[0491] The left and right side arms 502, 504 of the handle/lever
500 comprise liquid chamber engaging features in the form of
inwardly directed protrusions 510, 512. The spacing between the
arms 502, 504 is sufficient to enable the widest part of the body
302 of the liquid chamber 300 above the flange 310 to be received
therebetween. However, the spacing between the protrusions 510, 512
is not sufficient to enable the widest part of the body 302 of the
liquid chamber 300 to be received therebetween.
[0492] In some configurations the edges of the protrusions 510, 512
might be bevelled, curved or angled such that they can more easily
ride along and push the chamber 300.
[0493] In some configurations the protrusions 510, 512 may be
formed from or include (for example, as an overmoulded layer) a
soft (or at least softer than the handle 500) resilient material or
component to prevent damage to the chamber 300 that might arise if
the handle 500 is closed on the chamber 300 too forcefully.
[0494] To insert the liquid chamber 300 in the chamber bay 108,
initially the handle/lever 500 is in the raised position as shown
in FIG. 33. The liquid chamber 300 is partially inserted into the
bay 108 with its bottom surface resting on the heating plate 140
and its flange 310 positioned beneath the guide rails 144, 146, as
shown in FIG. 34. The chamber 300 will be manually moved rearwardly
in the housing a sufficient amount that the ports 322, 340, 306,
308 are at least partly engaged. For example, the O-ring seals
between the ports 322, 340, 306, 308 may be engaged but the
resilient fingers 372 may not be engaged.
[0495] The handle/lever 500 can then be pivoted downwardly toward
its lowered position as shown in FIG. 35. In this intermediate
position, the protrusions 510, 512 have engaged with the widest
part of the housing 302 of the liquid chamber 300. Further downward
movement of the handle/lever 500 through the positions shown in
FIGS. 36, 37, and 38 progressively drives the liquid chamber 300
rearwardly into increased engagement with the ports 322, 340 of the
apparatus 10, until the resilient fingers 372 (if present) are
engaged with the lips in the ports 306, 308 in the liquid chamber
300.
[0496] In the closed or fully lowered position of the handle/lever
500 shown in FIG. 38, the cross-member 506 is located in the recess
in front of the lips 142, 242 at the front of the upper and lower
chassis parts, and encloses a portion of the chamber bay. The
forwardly directed protrusion 243 of the lower chassis 202 is
located in a complementary recess 507 in the cross-member, and acts
as a positive engagement feature to positively engage the
handle/lever 500 in the lowered position. With the handle/lever 500
in the lowered position, a portion of the cross-member 506 projects
sufficiently above the floor of the chamber bay 108 and above the
flange 310 of the liquid chamber that it prevents the liquid
chamber 300 from being slid forward and removed from the liquid
chamber bay 108. The guide rails 144, 146 prevent the liquid
chamber 300 from being lifted and removed vertically from the
liquid chamber bay 108.
[0497] The cross-member 506 of the handle/lever is resilient so
that it can flex sufficiently to enable the protrusion 243 to be
inserted into the recess or aperture 507 or removed therefrom.
[0498] To remove the liquid chamber 300 from the chamber bay 108,
the steps shown in FIGS. 33 to 38 are reversed. When the
handle/lever 500 is lifted a sufficient amount, the protrusions
510, 512 will clear the liquid chamber 300 so that the liquid
chamber 300 can be slid forward until its flange 310 clears the
guide rails 144, 146 and the ports 322, 340, 306, 308 disconnect.
The liquid chamber 300 can then be removed from the housing
100.
[0499] In an alternative configuration of the handle/lever 500,
rather than having protrusions 510, 512, only a single protrusion
or other liquid chamber engaging feature may be provided. In
another alternative configuration, part of the cross-member 506 may
be configured to push against liquid chamber 300 and act as the
liquid chamber engaging feature.
[0500] In an alternative configuration, the cross-member 506 may
not be a sufficient size to act as a carrying handle for the
apparatus when in a raised position.
[0501] The handle/lever 500 may be gas injection moulded so that it
has smooth exterior surfaces to assist with cleaning of the
handle/lever. The handle/lever may comprise an external seal to
seal between the handle/lever and the housing. The sealing between
the handle and the housing may be within the handle retainer about
the aperture (in the region of item 4498 in FIG. 117) that the
handle moves in and out of when raised/lowered. A seal could be
used to seal between the handle and the upper chassis.
[0502] FIGS. 39 to 43 show an alternative guide rail configuration
that assists with insertion and/or retention of the liquid chamber
300 in the chamber bay 108. In this configuration, the guide rails
144', 146' comprise detents 144a, 146a. The detents 144a, 146a
comprise enlarged recesses that typically have a size and
configuration corresponding substantially to the largest dimension
of the body 302 of the liquid chamber 300. The detents 144a, 146a
correspond in position to the fully inserted position of the liquid
chamber 300 in the chamber bay 108, and the fully engaged position
of the ports 322, 340, 306, 308.
[0503] A portion 144b, 146b of each guide rail 144', 146' located
between the detent 144a, 146a and the front of the chamber bay 108
forms an inwardly directed ridge, with the ridges having a spacing
therebetween that is smaller than the largest dimension of the body
302 of the liquid chamber 300. At least the ridges 144b, 146b of
the guide rails 144', 146' have sufficient resilience, that as the
liquid chamber 300 is inserted between the guide rails 144', 146'
with its flange 310 beneath the guide rails 144', 146', the ridges
144b, 146b deform or flex outwardly (relative to the main housing
100) until the chamber 300 is fully engaged in the detents 144a,
146a between the guide rails 144', 146', following which the ridges
144b, 146b have flexed back inwardly. Alternatively or
additionally, the liquid chamber 300 may be somewhat resilient and
can deform to pass the ridges 144b, 146b, and can `pop` back to its
original shape once the liquid chamber is fully engaged in the
detents 144a, 146a. Similarly, the ridges 144b, 146b deform or flex
outwardly, and/or the liquid chamber 300 deforms inwardly, as the
chamber 300 is removed from the detents 144a, 146a. The guide rails
and, in particular the detents 144a, 146a and ridges 144b, 146b,
provide tactile feedback to a user to enable the user to easily
determine when the liquid chamber 300 is fully engaged in the
chamber bay 108. The detents 144a, 146a and ridges 144b, 146b may
be provided in addition to the resilient fingers on the port(s), or
could be provided as an alternative to the resilient fingers.
[0504] The heater plate 140 is resiliently mounted; for example, on
biasing device(s) such as spring(s). The resilient mounting enables
the heater plate to move downwardly to accommodate the liquid
chamber in the chamber bay, while maintaining good contact between
the heater plate 140 and the base of the liquid chamber once the
chamber is inserted in the chamber bay.
[0505] The handle/lever arrangement in combination with the guide
rails positions and retains the liquid chamber in the correct
position. The guide rails also enable the liquid chamber to be
turned or rotated to align its ports with the ports in the main
housing.
[0506] Rear portions of the guide rails 144', 146' may have ridges
as shown to provide precise location of the liquid chamber 300 in
the chamber bay 108. However, rather than the guide rails defining
the rearmost position of the liquid chamber 300 in the chamber bay
108, the rearmost position of the liquid chamber 300 in the chamber
bay 108 may instead be defined by engagement of the ports 322, 340,
306, 308 or by engagement of part of the liquid chamber 300 with
part of the housing 100; for example, a rearward portion of the
flange 310 with the wall 134 of the housing 100.
[0507] Rather than having recesses on the guide rails, the detents
may be configured differently. For example, the guide rails may
comprise protrusions, with the liquid chamber having recesses to
receive the protrusions when the liquid chamber is fully engaged in
the chamber bay.
[0508] In an alternative configuration, the detents may be provided
adjacent to the guide rails rather than integrated into the guide
rails. For example, the protrusions or recesses may be provided in
a portion of the chamber bay 108 of the main housing adjacent the
guide rails (for example, above or below the guide rails), with the
liquid chamber configured to engage with the detents when inserted
into the chamber bay 108. The detents will be aligned with the
direction of insertion and removal of the liquid chamber into and
from the chamber bay to enable that engagement. For example, if the
liquid chamber is arranged to be inserted vertically into the
chamber bay, the detents will be configured accordingly.
[0509] In an alternative configuration, only a single detent may be
provided. For example, only one guide rail may have a recess and
ridge. Alternatively, only one guide rail may have a projection for
receipt in a recess on the liquid chamber. Alternatively, a single
detent may be provided adjacent only one of the guide rails.
[0510] This configuration also differs from that described above in
that rather than a protrusion 243 being provided on the front of
the lower chassis 202, a recess 243' is provided in the main
housing. The cross member 506' of the handle/lever 500' may be
provided with a hook or projection (not shown) to engage in the
recess 243'.
[0511] This configuration also differs in that the left and right
side arms 502', 504' of the handle/lever 500' comprise apertures
502a, 504a for guiding liquid tubes from above into the liquid
chamber 300, to enable the liquid chamber 300 to be refilled and/or
emptied as desired. The apertures 502a, 504a are provided in bosses
in pushers 503, 505 that are described below, but could be provided
elsewhere on the handle/lever 500'.
[0512] The handle/lever 500' also assists with disengaging the
liquid chamber 300 from the chamber bay 108. The handle/lever 500'
comprises left and right side pushers 503, 505 to assist with that
disengagement. The left side pusher 503 is connected to and extends
inwardly from the left side arm 502', and the right side pusher 505
is connected to and extends inwardly from the right side arm 504',
such that the pushers 503, 505 extend towards each other. As shown
in FIG. 45, the pushers 503, 505 are positioned on the side arms
502', 504' so that when the handle/lever 500' is in its lowered or
closed position, the pushers 503, 505 are located at the rear of
the chamber bay 108 adjacent the vertical wall portion 134.
[0513] The pushers 503, 505 each comprise a platform portion 503a,
505a, which is substantially horizontal when the handle/lever 500'
is in the lowered or closed position. Each pusher 503, 505 also
comprises at least one engagement member 503b, 503c, 505b, 505c
which is arranged to engage against the liquid chamber 300 and push
the liquid chamber 300 out of engagement from the detents 144a,
146a of the guide rails 144', 146' when the handle/lever 500' is
lifted from the lowered or closed position. As shown in FIG. 45,
the engagement members 503b, 503c, 505b, 505c extend vertically
downwardly from the platform portions 503a, 505a when the
handle/lever 500' is in the lowered or closed position.
[0514] In some configurations the edges of the engagement members
503b, 503c, 505b, 505c might be bevelled, curved or angled such
that they can more easily ride along and push the liquid
chamber.
[0515] In some configurations the engagement members 503b, 503c,
505b, 505c may be formed from or include (for example, as an
overmoulded layer) a soft (or at least softer than the handle 500')
resilient material or component to prevent damage to the liquid
chamber 300 that might arise if the handle is moved too
forcefully.
[0516] Each inner engagement member 503b, 505b positioned toward
the centre of the liquid chamber 300 has a shorter front/rear depth
D1 than the depth D2 of the outer engagement members 503c, 505c
positioned toward the side walls 112, 118 of the housing 100 (FIG.
49). Each inner engagement member 503b, 505b positioned toward the
centre of the liquid chamber 300 has a smaller height H1 than the
height H2 of the outer engagement members 503c, 503d positioned
toward the side walls 112, 118 of the housing 100 (FIG. 49). Each
engagement member 503b, 503c, 505b, 505c has an arcuate engagement
surface 503b', 503c', 505b', 505c' for engaging against the liquid
chamber 300 as the handle/lever 500' is lifted. The inner
engagement surfaces 503b', 505b' have a steeper, more vertical
angle, and a larger radius of curvature than the respective outer
engagement surfaces 503c', 505c'.
[0517] The outer engagement members 503c, 505c are arranged to
engage against the flange 310 of the liquid chamber 300, and the
inner engagement members 503b, 505b are arranged to engage against
the housing 302 of the liquid chamber 300 as the handle/lever 500'
is lifted from the lowered/closed position. That will push the
liquid chamber 300 out of engagement of the guide rail recesses
144a, 146a, and overcome the force of the guide rail ridges 144b,
146b, to enable a user to easily remove the liquid chamber 300 from
the chamber bay 108. The shape, and in particular the curvature, of
the engagement members 503b, 503c, 505b, 505c is such that they
will not interfere with insertion of the liquid chamber 300 into
the chamber bay 108 as the handle/lever 500' is lowered from its
raised/open position to insert the liquid chamber 300 into the
chamber bay 108.
[0518] An inner forward edge 503d, 505d of each pusher platform is
provided as an arcuate surface having a curvature corresponding at
least generally to the curvature of the housing 302 of the liquid
chamber 300. The edges 503d, 505d act as rearward stops for the
liquid chamber 300 when the handle/lever 500' is in the
lowered/closed position.
[0519] In the form shown, each pusher 503, 505 has two engagement
members 503b, 503c, 505b, 505c; however, only a single engagement
member may be provided on each pusher. The handle/lever 500' may
only have a single pusher, but two spaced apart pushers will
disengage the liquid chamber 300 from the guide rails 144', 146'
more evenly.
[0520] In this configuration, there are no inwardly directed
protrusions to force the liquid chamber 300 into full engagement in
the chamber bay 108, but one or both of those protrusions or other
liquid chamber engaging feature(s) may be provided. Alternatively,
as discussed above for the previous configuration, rather than
having inwardly directed protrusions, this handle/lever 500' may
have a feature on its cross-member 506' that drives the liquid
chamber 300 into engagement in the chamber bay 108.
[0521] Similarly, this handle 500' may be provided with feature(s)
to assist with disengagement of the liquid chamber 300 from the
detents 144a, 146a.
[0522] It will be appreciated that the detent(s) 144a, 146a could
alternatively be used in a configuration with the handle/lever 500
of the earlier configuration.
[0523] FIGS. 45-48 show details of the pivot arrangement of the
handle 500' which may also be used for the handle 500. A rearward
portion of each side arm 502', 504' comprises an inwardly directed
pivot protrusion 502b, 504b that is received in a respective pivot
cavity 502c, 504c in ledge 132. The arms 502', 504' are captured,
laterally, between the ledge 132 and the respective inner side
walls 112, 118 so that the pivots cannot be moved laterally but the
arms 502', 504' can pivot about horizontal pivot axes. A ledge
114a, 120a extends inwardly from the interconnecting walls 114, 120
to prevent the pivots from being lifted vertically.
[0524] FIGS. 53 and 54 show the display and user interface module
14 of the apparatus 10. The module 14 comprises a touch screen
display 600 that provides information to a user of the apparatus 10
about the status of the apparatus 10, status of the therapy being
provided, status of a patient, and/or status of an accessory or
peripheral associated with the apparatus 10. The display 600 may
comprise one or more indicia 602a, 602b, 602c that each provide
information about a respective aspect of the therapy; for example
gas temperature, oxygen concentration, gasflow rate, blood oxygen
concentration (SpO.sub.2), and heart rate. Other indicia may also
be provided. The indicia may also act as touch screen `buttons`
where pushing on one of the indicia enables a user to change a
setting of an aspect of the therapy, of the apparatus 10, and/or of
an accessory or peripheral associated with the apparatus 10, which
then causes the controller 13 to adjust the apparatus 10 or
accessory or peripheral to that new setting.
[0525] The touch screen 600 may be in electrical communication with
an interface printed circuit board 604 which, in turn, is in
electrical communication with one or both of the electronics boards
272.
[0526] The interface 14 may also have one or more physical buttons
to enable a user to power up or down the apparatus 10, or to change
a setting. The upper wall 124 is advantageously angled toward a
front of the apparatus 10, at an angle of 10 degrees relative to
horizontal for example. This enables ease of use of the interface
from a front of the apparatus 10.
[0527] A portion of the upper wall 124 defines an integrally formed
cavity 606 comprising an outer cylindrical portion 608, an inner
cylindrical portion 610, and an annular wall 612 that extends
between and interconnects the bottom edges of the two cylindrical
wall portions 608, 610. The axial direction of the cylindrical
portions 608, 610 corresponds to an open/close direction of an
injection-moulding tool to enable the component to be injection
moulded.
[0528] A flexible button 614 is positioned adjacent the top of the
outer cylindrical wall portion 608, and is substantially aligned
with the upper wall 124. An underside of the button 614 comprises
an elongate pusher 616 that extends through the inner cylindrical
wall portion 610 and interacts with a microswitch 618 on the PCB
604. The outer cylindrical wall portion 608, annular wall 612, and
inner cylindrical wall portion 610 form a continuous, unbroken,
liquid impermeable configuration that acts as a liquid reservoir to
capture any liquid that may enter the button arrangement around the
flexible button 614, and prevents the liquid from reaching the
underlying PCB 604.
[0529] The interface 14 may comprise one, two, or more buttons
having this configuration. Alternatively, the interface 14 may
solely be touch screen controlled, and have no buttons.
[0530] FIGS. 55 to 64 show an alternative configuration flow
therapy apparatus 10' showing an alternative configuration
handle/lever 1500. The flow therapy apparatus 10' will have the
features and functionality described in relation to the different
configurations above, but those features are not repeated here for
simplicity. For the features that are shown, like numerals indicate
like parts with the addition of a prime (') for most components,
and with the addition of 1500 for the handle/lever.
[0531] This configuration differs from those described above, in
that the handle/lever 1500 is a single sided configuration. That
is, only one side of the handle/lever 1500 is pivotally connected
to the main housing of the flow therapy apparatus 10', whereas
there is no pivot connection of the other side of the handle/lever
1500 to the main housing. In the form shown, the left side of the
handle/lever 1500 is pivotally connected to the main housing.
However, in an alternative configuration, only the right side may
be pivotally connected to the main housing.
[0532] The handle/lever 1500 and main housing are modified from
those described above to provide that mounting.
[0533] The handle/lever has a left side arm 1502 that is pivotally
attached to the left inner side wall 112' of the upper chassis
102'. The left side arm 1502 is configured to be substantially
flush with the interconnecting wall 114' when the handle 1500 is in
the lowered or closed position of FIG. 55. Rather than a right side
arm, the handle/lever further comprises a right side member 1504
that is shorter than the left side arm 1502, and that is not
pivotally attached to the right inner side wall 118' of the upper
chassis 102'. The right side member 1504 is configured to be
substantially flush with the interconnecting wall 120' when the
handle 1500 is in the lowered or closed position of FIG. 55. The
main housing is provided with recesses to enable the left side arm
1502 and right side member 1504 to be substantially flush with the
interconnecting walls. The right side interconnecting wall 120'
extends further toward the front of the apparatus 10' than the left
side interconnecting wall 114', due to the shorter right side
member 1504.
[0534] A cross-member handle portion 1506 interconnects the forward
ends of the left side arm 1502 and the right side member 1504 and
forms an engagement region for grasping by a user's fingers. When
the handle 1500 is in the raised position as shown in FIG. 57 for
example, the cross-member 1506 can act as a carrying handle for the
apparatus 10'. The liquid chamber 300' can be inserted into or
removed from the chamber bay 108' when the handle/lever 1500 is
raised. When the handle/lever 1500 is in the lowered position, it
inhibits or prevents removal of the liquid chamber 300' from the
chamber bay 108'.
[0535] Rather than having the right side member 1504, the
handle/lever 1500 may terminate at the right side of the
cross-member 1506. However, having the rearwardly directed member
1504 is preferred, as it reduces the likelihood of the apparatus
10' being dropped while it is being carried.
[0536] In the closed or fully lowered position of the handle/lever
1500 shown in FIG. 55, the cross-member 1506 is located in the
recess 242' at the front of the main housing and encloses a portion
of the chamber bay. Although no join is shown in the figures, the
main housing may be formed with upper and lower chassis parts 102',
202', and the recess 242' will be formed in the appropriate chassis
part. The handle/lever 1500 and/or recess 242' may have a positive
engagement feature, such as one of those described above, to
positively engage the handle/lever 1500 in the lowered or closed
position. With the handle/lever 1500 in the lowered or closed
position, a portion of the cross-member 1506 projects sufficiently
above the floor of the chamber bay 108' and above the flange 310'
of the liquid chamber 300' that it prevents the liquid chamber 300'
from being slid forward and removed from the liquid chamber bay
108'. Although not shown in this configuration, the liquid chamber
108' will comprise guide rails to prevent the liquid chamber 300'
from being lifted and removed vertically from the liquid chamber
bay 108' when the handle/lever 1500 is in the lowered or closed
position. Because the handle/lever encloses a portion of the
chamber bay when the lever is in the closed or fully lowered
position, when the handle/lever is in the fully raised position, a
large space is created between the cross-member of the handle/lever
and the housing of the apparatus including a large opening at the
front of the chamber bay and around the liquid chamber, allowing
easy insertion and removal of the liquid chamber to and from the
chamber bay because a user's fingers can easily fit between housing
walls and the liquid chamber.
[0537] FIGS. 55, 56, and 60-64 show details of the pivot
arrangement of the handle/lever 1500. A rearward portion of the
left side arm 1502 is connected to a pivot arm 1502d. The pivot arm
comprises a forward arcuate portion 1502e that extends downwardly
and rearwardly from the left side arm 1502 when the handle is in
the lowered or closed position. A rearward part of that forward
arcuate portion 1502e is connected to a linear portion 1502f that
extends upwardly and forwardly therefrom when the handle is in the
lowered or closed position. An upper end of the linear portion
1502f is coupled to inwardly and/or outwardly directed pivot
protrusion(s) 1502b that is/are received in a pivot cavity or
cavities 1502c in a portion of the housing corresponding to the
ledge 132' and/or in the left inner side wall 112'. The arm 1502 is
captured, laterally, between the ledge 132' and the inner side wall
112' so that the pivot protrusions 1502b cannot be moved laterally
but the arm 1502 can pivot about a horizontal pivot axis.
[0538] As shown in FIGS. 56, 61, and 62, the left inner side wall
112' is provided with a shaped recess 112a' to receive the pivot
arm 1502d. The recess 112a' enables the pivot arm 1502d to travel
throughout its range of motion from the position shown in FIG. 60
to the position shown in FIG. 62, without encroaching significantly
on the space in the liquid chamber bay 108'.
[0539] An upper forward portion of the main housing comprises a
platform 150'. The platform 150' may also comprise apertures and
may be removable to act as the removable retention cover for the
removable elbow as described for the configuration above. An upper
portion 151' of the platform forms a substantial continuation of
the forwardly angled surface 124', and extends forwardly and
downwardly from that surface 124'. A forward edge 151a' of the
upper portion 151' extends at a more horizontal or upward
orientation than the remainder of the upper portion 151'.
[0540] This configuration is suitable for use with a liquid chamber
300' that is filled from a flexible liquid bag. While hospitals and
medical facilities will generally have bag stands for supporting
liquid bags, people do not typically have suitable bag stands in a
home environment. This configuration enables a liquid bag to be
rested on top of the main housing, and particularly on the platform
150'. The forward edge 151a' will reduce the likelihood of the bag
sliding forward off the housing. The one sided handle/lever 1500
will enable the handle/lever 1500 to be raised and lowered while
enabling the liquid bag and/or liquid tube(s) that deliver liquid
from the liquid bag to the liquid chamber 300' to be fed through
the space between the right side member 1504 of the handle/lever
1500 and the main housing, when the handle/lever 1500 is in the
raised position. Long tube(s) do not need to be provided.
[0541] The handle/lever 1500 may comprise one or more features,
such as apertures 502a, 504a as shown in FIG. 52 for example, for
guiding liquid tube(s) from above into the liquid chamber. The
tube(s) will be coupled to the liquid chamber. The liquid chamber
may comprise a float valve which controls flow of liquid from the
tube(s) into the liquid chamber.
[0542] As shown in FIGS. 57 to 59, the forward edge 151a'
preferably also forms a recess for receiving the rear upper edge of
the liquid chamber 300' when it is fully engaged in the liquid
chamber bay 108'.
[0543] The handle/lever 1500 will be provided with one or more
features to assist with insertion, retention, and/or removal of the
liquid chamber 300' in or from the chamber bay 108'. Those features
may be any one or more of the features described in relation to the
configurations above.
[0544] By providing a handle/lever that assists with insertion
and/or retention and/or removal of the liquid chamber in and/or
from the chamber bay, a user can readily ensure that the liquid
chamber is fully inserted in the chamber bay while still being able
to easily remove the liquid chamber form the chamber bay when
desired. This is particularly advantageous for users with limited
mobility. Similarly, by providing detent(s) to assist with
insertion and/or retention of the liquid chamber in the chamber
bay, a user can readily ensure that the liquid chamber is fully
inserted in the chamber bay. Full or correct insertion and/or
retention may be required to ensure that a satisfactory seal is
obtained and maintained between the liquid chamber and other
component(s) that form part of the gasflow path.
6. Removable Gasflow Tube or Elbow and Receiver--Alternative
Configurations
[0545] FIGS. 66 to 71 and 72 to 75 respectively show two
alternative gas flow tubes or elbows 1342 and 2342 that can be used
in the flow therapy apparatuses described herein. Unless described
below, the gas flow tubes or elbows 1342 and 2342 have the features
and functionality described in relation to the removable elbow 342
above, and like reference numerals indicate like parts with 1000
and 2000 respectively added to each reference numeral.
[0546] The removable elbow 1342 of FIGS. 66 to 71 is provided with
an internal pool region 1371 in the gasflow passage at the
interface of the two arms of the substantial L-shape; i.e., at the
interface of the gasflow passage of the manifold gases inlet port
1340 (humidified gases return) and the gasflow passage of the
patient outlet port 1344. As shown in FIG. 69, the pool region 1371
is provided by an enlarged region in the gasflow passage. The pool
region is positioned vertically lower than an adjacent base wall
portion 1340a of the manifold gases inlet port, so that liquid can
pool in the pool region 1371 up to the depth of the adjacent base
wall portion 1340a. The pool region 1371 allows pooling of liquid
to help thermistors 1366d (described below) on the PCB connector
1366 determine a temperature that is representative of the gasflow
passage 1364/gases characteristic. This can assist with the
determination of a wet bulb temperature of the gases passing
through the elbow 1342.
[0547] The body of the removable elbow is provided with an arcuate
transition region 1372 that extends downwardly and in a direction
away from the adjacent base wall portion 1340a, at a relatively
shallow angle. The arcuate transition region 1372 forms a forward
portion of the pool region 1371. The rearmost portion of the
transition region 1372 terminates at an upper end of a wall portion
1373 that extends downwardly and rearwardly at a second relatively
steep angle. The wall portion 1373 forms a front wall of a support
portion 1374 of the body. An upper inner part of the support
portion 1374 forms a rearward portion of the pool region 1371,
which extends upwardly and rearwardly from its interface with the
transition region 1372.
[0548] A lower angled outer edge 1375 of the support portion 1374
extends upwardly and rearwardly from the base of the front wall
1373. The support portion 1374 of the elbow serves two purposes.
The first is to provide a mounting of the PCB electrical connector
1366 to the removable elbow 1342, as will be described below. The
second is to provide a support surface to assist with aligning the
PCB connector 1366 during insertion of the removable elbow into
position in the main housing of the apparatus.
[0549] As can be seen most clearly from FIG. 69, the lower angled
outer edge 1375 is oriented at a non-parallel and non-coaxial angle
.alpha. relative to a longitudinal axis 1340A of the manifold gases
inlet port 1340. The angle may be between about -15 degrees
(downward) and about +30 degrees (upward) relative to the
longitudinal axis 1340A. In one form, the angle is between about 0
degrees and about 30 degrees upward relative to the longitudinal
axis 1340A. Advantageously, the upper limit is 30 degrees, as
having too much tilt on the PCB electrical connector 1366 may
result in the elbow providing an undesirable shallow flow path
through the elbow and prevent the provision of a useful pooling
region. In one form, the angle is between about 0 degrees and about
15 degrees upward relative to the longitudinal axis 1340A. In one
form, the angle is about 15 degrees upward relative to the
longitudinal axis 1340A. Within these ranges, the angle may be
non-parallel and non-coaxial relative to the longitudinal axis, and
may be oriented at least +/-5 degrees relative to the longitudinal
axis 1340A. In an alternative form, the angle may be parallel to or
coaxial with the longitudinal axis 1340A. The PCB electrical
connector 1366 is mounted in the support portion 1374 to be
collinear with, or parallel to, the lower angled outer edge 1375.
Therefore, the PCB connector advantageously also extends upwardly
and rearwardly at an angle of between about -15 degrees and about
+30 degrees, in one form between about 0 degrees and about +30
degrees, in one form between about 0 degrees and about +15 degrees,
and in one form at about +15 degrees, relative to the longitudinal
axis 1340A. Again, within these ranges, the angle may be non-zero,
and for example may be at least +/-5 degrees relative to the
longitudinal axis. A base portion 1368b of the electrical connector
portion may be aligned with the lower wall portion 1375. It can be
seen that in this version, the interface of the PCB electrical
connector with the elbow body is lower than in the version shown in
FIG. 29.
[0550] FIGS. 76 and 77 show an alternative configuration upper main
chassis/display and user interface carrier 2102 of the main housing
that may be used in the flow therapy apparatuses described above,
in combination with the removable elbow 1342 or 2342. Unless
described below, the features and functionality will be the same as
described for the flow therapy apparatuses above, and like
reference numerals indicate like parts with 2000 added to each
reference numeral.
[0551] The upper chassis/carrier 2102 comprises an elbow retainer
2160 extending forwardly from wall 2130. The retainer 2160
comprises a base wall 2161 and two spaced apart upright side walls
2162. Inwardly directed flanges 2163 extend towards each other from
the upper ends of the side walls 2162, with a spacing between the
flanges 2163 being large enough to enable the patient outlet port
1344 to extend upwardly therebetween. An upright ridge 2163a is
formed by a substantially vertical wall portion at the inner edge
of each flange 2163. The flanges 2163 and ridge 2163a are arcuate
to form a mouth to receive the patient outlet port 1344. The
upright ridge is arranged to be in close contact with the periphery
of the patient outlet port 1344 when the removable elbow is
received in the retainer 2160. A rear portion 2164 of the retainer
has a dimension smaller than that of the patient outlet port 1344,
and is provided to enable the power connector portion 1368a of the
body to project upwardly therethrough.
[0552] The walls 2162, flanges 2163, and ridge 2163a form a hood
region that substantially matches the shape of the removable elbow
1342, 2342 when it is inserted into the elbow retainer. The hood
region assists with holding the elbow in place, and helps to reduce
liquid ingress to the elbow or PCB connector, and encapsulates the
PCB connector. The ridge 2163a further assists with directing
liquid away from the connection between the PCB connector and the
connector 278.
[0553] To insert the elbow into the retainer 2160, the elbow is
oriented so that the lower wall portion 1375 of the support portion
is resting on the base wall 2161 of the retainer. The elbow is
moved rearwardly so that the patient outlet port 1344 is located
between the flanges and the connector 1366 is inserted to extend
through the slot in the retainer so that it can be inserted into
the female connector 278 which is positioned in the upper chassis
at the rear of the retainer 2160. The retainer is oriented at an
angle corresponding to angle .alpha. of the PCB connector so that
the PCB connector is parallel with the base wall 2161. The
orientation of the manifold gases inlet port 1340 relative to the
PCB connector provides for a horizontal connection with the liquid
chamber. Thus, the PCB connector can be inserted directly into the
retainer 2160 without needing to tilt or adjust the elbow to
achieve that insertion. In alternative configurations, the PCB
connector and elbow retainer 2160 may be oriented at different
angles, such as those described above in relation to the elbow.
[0554] By having the PCB connector at a non-horizontal angle in
use, any liquid that may ingress into the main housing should drain
away from the connector. A removable retention cover 150 will again
be used to assist with maintaining the removable elbow in position
in the housing, and the operation of the cover and interaction of
the elbow and liquid chamber will be as described above. The hood
provides a lower profile retainer 2160 than the version shown in
FIG. 30, with the hood sized to receive just the lower portion of
the elbow 1342 that houses the PCB connector, rather than the
entire height of the manifold gases inlet port.
[0555] In this configuration, the port 1344 is positioned closer to
the liquid chamber than in the apparatus of FIG. 24, which means
that the breathing conduit 16 will block the user display and user
interface module less than in the apparatus of FIG. 24. As a
result, the elbow is shorter in length than the elbow of FIG.
28.
[0556] FIGS. 70 and 71 show details of the PCB electrical connector
1366 of the removable elbow 1342. The connector 1366 comprises a
plastic board 1366a with a plurality of electrically conductive
tracks 1366b embedded therein. A plurality of electrically
conductive connector portions or pins 1366c are provided at one end
of the PCB, which is the end that projects from the elbow. Those
tracks are configured to engage with complementary conductors in
the female connector 278 to provide an electrical and/or
communication coupling of the PCB connector to other components of
the apparatus. The connector portions 1366c and tracks 1366b may
all be provided on one side of the PCB connector, or some may be
provided on opposite sides of the PCB connector to reduce the risk
of electrical shorting.
[0557] In the form shown in FIG. 71, four of the conductive
connector portions 1366c are in electrical communication with
thermistors 1366d that are positioned at or adjacent an opposite
end of the PCB connector, and that are embedded in the elbow body.
The remaining two connector portions 1366c are in electrical
communication with couplings 1366e that receive bases of two
substantially rigid upwardly projecting pin connectors 1368 for
coupling to and powering the heater wire(s) 3c in the patient
breathing conduit. As shown in FIG. 70, the pin connectors 1368 may
be rigid members that extend at a non-perpendicular angle from the
top of the PCB, the non-perpendicular angle corresponding to angle
.alpha. of the PCB connector relative to the longitudinal axis
1340A (FIG. 69). The pin connectors may be any suitable angle
relative to the PCB connector, including perpendicular. The pin
connectors advantageously extend substantially parallel to a
longitudinal axis of the patient outlet port 1344.
[0558] The two thermistors 1366d are surface mounted at the front
of the PCB connector, and are embedded in the body of the removable
elbow. They are located approximately in position 1366d shown in
FIG. 69, in close proximity to the pooling region 1371. By
positioning them close to the pooling region, they can provide a
more representative gases measurement. Digital temperature
sensor(s) could be used instead of thermistor(s).
[0559] The PCB connector can be mounted to the elbow body in any
suitable manner. In one example, when surface mounted thermistors
1366d are used on the PCB connector, single shot overmoulding could
be used to manufacture the elbow on the PCB connector, to simplify
manufacturing. The single shot overmoulding can also encompass the
elongate pin connectors 1368 in a chimney portion 1368a. Hole(s)
1366g in the PCB can allow overmoulded material to flow through the
PCB, to reduce or prevent deflection of the PCB connector that
could otherwise occur due to moulding pressures. The lower portion
1368b of the elbow body beneath the electrical connector portion
under the PCB connector acts to cover the solder points at the base
of the pin connectors.
[0560] The shape of the pooling region and surrounding elbow body
is configured to remove as much mass as possible from around the
thermistors to improve their performance. The pooling region may
also assist with gasflow through the removable elbow by stopping
the gases from `clinging` tightly to the inner wall.
[0561] The removable elbow 1342 will be provided with suitable
seals. For example, T-seals may be provided on the manifold gases
inlet port 1340 to seal between that port and the liquid chamber
gases outlet port 308 and an O-ring seal may be provided on the
patient outlet port 1344.
[0562] Similar to the elbow 1342 described above, the removable
elbow 2342 is provided with a support portion 2374 extending
generally rearwardly from the elbow body at the base of the
interface of the two arms of the substantial L-shape; i.e.,
substantially at the interface of the manifold gases inlet port
1340 and the patient outlet port 1344. The support portion
comprises a body portion with a front wall 2373 and a lower angled
outer edge 2375 that extends rearwardly therefrom. The body portion
is shaped and configured to receive a PCB electrical connector
2366.
[0563] The lower angled outer edge 2375 extends upwardly and
rearwardly from the base of the front wall 2373. The support
portion 2374 of the elbow serves two purposes. The first is to
provide a mounting and support for the PCB electrical connector
2366 to the removable elbow 2342, as will be described below. The
second is to provide a support surface to assist with aligning the
PCB connector during insertion of the removable elbow into position
in the main housing of the apparatus.
[0564] The support portion 2374 provides additional plastic around
the PCB connector to encapsulate the PCB connector. When the elbow
2342 is connected to the retainer 2160, the support portion 2374
interacts with the underside of the hood to reduce or prevent
vertical movement of the elbow and rotation about the axis
1340A.
[0565] As can be seen most clearly from FIG. 72, the lower angled
outer edge 2375 is oriented at a non-parallel and non-coaxial angle
.alpha. relative to a longitudinal axis 2340A of the manifold gases
inlet port 2340. The angle may be between about -15 degrees
(downward) and about +30 degrees (upward) relative to the
longitudinal axis 1340A. In one form, the angle is between about 0
degrees and about 30 degrees upward relative to the longitudinal
axis 2340A. Advantageously, the upper limit is 30 degrees, as
having too much tilt on the PCB electrical connector 2366 may
result in the elbow providing an undesirable shallow flow path
through the elbow and prevent the provision of a useful pooling
region. In one form, the angle is between about 0 degrees and about
15 degrees upward relative to the longitudinal axis 2340A. In one
form, the angle is about 15 degrees upward relative to the
longitudinal axis 1340. Within these ranges, the angle may be
non-parallel and non-coaxial relative to the longitudinal axis, and
may be oriented at at least +/-5 degrees relative to the
longitudinal axis 2340A. In an alternative form, the angle may be
parallel to or coaxial with the longitudinal axis 2340A. The PCB
electrical connector 2366 is mounted in the support portion 2374 to
be parallel to, the lower angled outer edge 2375. Therefore, the
PCB connector advantageously also extends upwardly and rearwardly
at an angle of between about -15 degrees and about +30 degrees, in
one form between about 0 degrees and about +30 degrees, in one form
between about 0 degrees and about +15 degrees, and in one form at
about +15 degrees, relative to the longitudinal axis 2340A. Again,
within these ranges, the angle may be non-zero, and for example may
be at least +/-5 degrees relative to the longitudinal axis.
[0566] This enables the removable elbow 2342 to be inserted into
the elbow retainer 2160 of the upper main chassis of FIGS. 76 and
77 in the same way described for elbow 1342 above.
[0567] The removable elbow 2342 of FIGS. 72 to 75 is shown without
an internal pool region, however a pool region may be provided as
outlined for the elbow of FIGS. 66 to 71. In one configuration, the
pool region may be provided internally in the elbow 2342 without
changing the shape of the exterior of the elbow. By not including
the pool region, the internal surface in the elbow may be smoother
(and configured as shown in FIG. 29 for example). This also enables
a more even wall thickness, which may strengthen the elbow.
[0568] FIG. 75 shows details of the PCB electrical connector 2366
of the removable elbow 2342. The connector 2366 comprises a plastic
board 2366a with a plurality of embedded electrically conductive
tracks 2366b. A plurality of electrically conductive connector
portions or pins 2366c are provided at one end of the PCB, which is
the end that projects from the elbow in use. Those connector
portions are configured to engage with complementary conductors in
the female connector 278 to provide an electrical and/or
communication coupling of the PCB to other components of the
device. In the form shown, some of the connector portions 2366c are
in electrical communication with thermistors 2366d that are
positioned at or adjacent an opposite end of the PCB connector and
that are embedded in the elbow body. Each thermistor has two tracks
extending from the connector portions 2366c to the thermistor, with
the two tracks extending to the thermistor being positioned on
opposite sides of the PCB to reduce the risk of electrical shorting
between the tracks. Two connector portions 2366c are in electrical
communication with couplings 2366e that receive bases of two
upwardly projecting substantially rigid pin connectors 2368 for
coupling to and powering the heater wire(s) 3c in the patient
breathing conduit. Again, these tracks may be provided on opposite
sides of the PCB to reduce the risk of electrical shorting. The pin
connectors will be configured and angled as shown in FIG. 70.
Additional connector portions 2366c may be used to power or provide
communication coupling of other components.
[0569] Two of the tracks are coupled to a device 2366f that is
configured to provide functionality which may include one or more
of identification, calibration functionality, and information
capture such as duration of use, power levels, and disinfection,
for example. For example, the device 2366f may be configured to
store and/or communicate usage/lifetime information of the
removable gasflow tube/elbow. Example information may include one
or more of: tracking data, how long the removable gasflow
tube/elbow has been used, when the removable gasflow tube/elbow was
first used, determine removable gasflow tube/elbow age (e.g. based
on manufacturing date), how many times the removable gasflow
tube/elbow has been used, determine and log
connection/disconnection of removable gasflow tube/elbow, determine
if disinfection has occurred, how many times the removable gasflow
tube/elbow has been disinfected, time of use since last
disinfection, when the removable gasflow tube/elbow should be
disinfected, power levels, unique ID, calibration, when the
removable gasflow tube/elbow should be replaced. The elbow may have
a specified usage life stored in the device 2366f such as up to 5
years from manufacture, or a shorter period such as a 1 year life
for example. In some configurations, the removable gasflow
tube/elbow may have a specified maximum number of disinfection
cycles before the removable gasflow tube/elbow should be replaced
stored in the device 2366f. For example, the maximum number of
disinfection cycles may be a specified number of disinfection
cycles per week, for a specified number of weeks. For example, for
a removable gasflow tube/elbow having a maximum usage life of one
year, the maximum number of disinfection cycles may be 52 cycles;
one cycle per week for one year. As another example, for a
removable gasflow tube/elbow having a maximum usage life of 5
years, the maximum number of disinfection cycles may be 260 cycles;
one cycle per week for five years.
[0570] The device 2366f may comprise one or more of a
microprocessor, memory, or microprocessor with integrated memory
for example. In one form, the device 2366f is an EEPROM. In some
configurations, the device 2366f could be a flash memory or some
other type of memory. The device 2366f may be configured to store
the functionality data or may be configured to communicate the
functionality data to the controller 13 of the apparatus via the
connector portions 2366c or via a suitable wireless transmission
protocol such as WI-FI, Bluetooth, or GSM for example.
[0571] The electronics of the removable elbow may be sealed against
liquid or gas ingress by potting.
[0572] The PCB electrical connector may be provided with one or
more apertures 2366g to assist with mounting the PCB connector to
the elbow body, and/or to reduce liquid ingress to the PCB. In the
form shown, the PCB is provided with two sets of apertures; one
relatively large aperture near the narrow end of the PCB adjacent
the thermistors 2366d, and five smaller apertures positioned closer
to the wider end of the PCB with the connectors 2366c. There are
also two of the smaller apertures positioned between the larger
aperture and the smaller apertures. However, this configuration
could be varied.
[0573] The two thermistors 2366d are surface mounted at the front
of the PCB connector, and are embedded in the body of the removable
elbow. They are located approximately in position 2366d shown in
FIG. 72, in close proximity to the gas flow passage 2364. The
plastic covering the thermistors may be thinned to enhance
temperature measurement, which may slightly alter the internal
curvature of the elbow from that shown.
[0574] The PCB connector 2366 can be mounted to the elbow body in
any suitable manner. In one example, when surface mounted
thermistors 2366d are used on the PCB connector, single shot
overmoulding could be used to manufacture the elbow on the PCB
connector, to simplify manufacturing. The single shot overmoulding
can also encompass the elongate pin connectors 2368 in a chimney
portion 2368a. The hole(s) in the PCB can allow overmoulded
material to flow through the PCB, to reduce or prevent deflection
of the PCB that could otherwise occur due to moulding
pressures.
[0575] Digital temperature sensor(s) may be used instead of
thermistor(s).
[0576] The support portion 2374 provides protection for the PCB. It
can serve to reduce liquid ingress to the PCB by plugging the
connection between the PCB connector and the main control board,
along with an optional seal if desired or required. The support
portion 2374 helps to fill the slot that receives the PCB when
coupled to the elbow retainer. Thus, if liquid was to drip/splash
into the coupling region, the support portion abuts the plastic of
the retainer surrounding the slot and reduces the likelihood that
the liquid would reach the PCB connector within. If the support
portion did not exist, there would be a higher chance that the
liquid could enter when the PCB and retainer are coupled through
gaps between the PCB and the retainer slot.
[0577] This is also helpful with regards to keeping water out of
the electrical connector and/or control board within the elbow
retainer.
[0578] A seal can be located on the additional plastic of the
support portion 2374, about the portion of the PCB
connector/support portion that presses against the elbow retainer
slot when inserted, or around the electrical connector that is
within the slot to aid in sealing between the PCB connector and the
connector of the retainer.
[0579] A combination of seals could be used.
[0580] These features, combined with the non-horizontal angle of
the PCB connector in use, helps to drain liquid away from the PCB
connector. Plastic surrounds the sides and upper portion of the PCB
so that there is no join between the PCB and elbow where liquid
could ingress. The support portion 2374 also provides protection
for the thin wall section at the base of portion 2368a, and the
plastic of the support portion encapsulates the PCB connector. It
also provides a flat base to assist with alignment during insertion
of the PCB connector into the elbow retainer.
[0581] The PCB connector may be plasma treated or coated with a
conformal coating to aid with bonding between the PCB and
overmoulded elbow.
[0582] The removable elbow 2342 will be provided with suitable
seals. For example, a T-seal may be provided on the manifold gases
inlet port 2340 to seal between that port and the liquid chamber
gases outlet port 308, and an O-ring seal or other seal may be
provided on the patient outlet port 2344. A T-seal can provide a
symmetrical seal which is easier for manufacturing. The T-seal can
deflect in both the insertion and removal directions, over a wide
range of heights (where the seal is contacted by the
inserting/removing part), which makes the T-seal more versatile
than an O-ring seal.
[0583] FIG. 137 shows an exemplary T-seal 2342T in place on the
manifold gases inlet port 2340 of the removable elbow 2342. The
T-seal 2342T is received in an annular recess 2340R adjacent the
outer end of the manifold gases inlet port 2340. As shown in FIG.
138, the T-seal has a relatively wide annular base or body 2342T1
that is sized and configured to be received in the annular recess
of the elbow 2342. The body 2342T1 defines a recess 2342T2 that
fits on an annular body portion in the annular recess of the elbow
2342. The radial thickness of the body 2342T1 may be sized to be
slightly thinner than the radial thickness of the recess.
[0584] An annular sealing projection 2342T3 projects radially
outwardly from the body 2342T1, and beyond the periphery of the
manifold gases inlet port 2340, to seal against an inner surface of
the liquid chamber gases outlet port 308. The annular sealing
projection 2342 T3 comprises a relatively narrow resilient annular
rib 2342T4 that extends radially outwardly from the body, and a
wider bobble tip or annular head 2342T5 having a bulbous
cross-sectional shape to provide a seal against the inner surface
of the liquid chamber gases outlet port 308.
[0585] The bobble tip 2342T5 provides a smooth/continuous sealing
surface, and advantageously reduces jamming or folding of the seal
as it changes the direction it is deflected. The bobble tip also
provides resistance to blow-over occurring from gas pressure in the
circuit. If any flash remains on the bobble tip post-manufacture,
the impact on effective sealing by this flash should be reduced
because the flash location will not be on the contact surface of
the liquid chamber gases outlet port 308 when the T-seal is
deflected. The T-seal may be moulded in the axial direction so that
flash will not affect sealing. The bobble tip 2342T5 may have a
non-sticky surface finish to prevent it from sticking to the
surface it seals against.
[0586] The following summarises the chosen exemplary dimensions and
parameters of the T-seal for use on the manifold gases inlet port
2340 of the removable elbow 2342T, which have been found to improve
locating and sealing between the liquid chamber and the removable
elbow, with reference to FIG. 139.
[0587] The exemplary dimensions and parameters are selected for the
specific embodiment described, but different values or combinations
of dimensions and parameters can be used for different embodiments,
applications, and/or materials.
[0588] Base width 2342T1': 2.3 mm-6 mm, for example 6 mm--It is
generally preferable to maximise the base width for a particular
application, to minimise seal base lift. The width of the base can
be optimised for stability of the seal. The base width will be
chosen to be thick enough to prevent rolling or lifting of the base
in use, which can compromise the seal.
[0589] Base thickness 2342T1'': 0.5 mm-0.9 mm, for example 0.9
mm--Chosen as a balance between minimising base lift and allowing
space for the T-seal to deflect into when assembled. An excessively
large base thickness may result in a compression fit between the
base 2342T1 and bobble tip 2342T5 when assembled. If the base is
too thick, the deflection of the T may be limited and cause a
compression seal with the base rather than a deflection seal. This
could cause the shape to remain deformed over time, which could
lead to increased force to make a seal and could lead to failure
over time. A thick base will allow more T deflection as it is less
likely to roll or lift when the T is deflected.
[0590] Stretch: for example 10%--This configuration is chosen to
allow stretching of the T-seal 2342T onto the recess 2342R of the
manifold gases inlet port 2340. If the seal is overstreched it will
have increased stress which can lead to tearing, and the height of
the seal may be reduced which may lead to issues with sealing. If
the seal is understretched, it may not hold onto the part very
well. The stretch is dependent on the base thickness, and any
suitable range may be chosen to optimise the seal.
[0591] T-section/annular rib thickness 2342T4': 0.35 mm-0.7 mm, for
example 0.7 mm--Having a relatively thin thickness reduces the
stiffness of the seal and helps prevent seal base lift. The thicker
the T is, the thicker the base needs to be to prevent the base from
lifting or rolling in use. Other materials could be used and
different results would be obtained.
[0592] Bobble tip diameter 2342T5': 0.6 mm-0.9 mm, e.g. 0.9
mm--This dimension was chosen as a combination of maximum
resistance to "blow-over" while still providing an acceptable user
insertion force and avoiding a compression fit against the seal
base 2342T1 when assembled. Blow over would occur if gas could
force the bobble tip beyond a sealing position and out of contact
with a sealing surface. This "bobble" geometry provides a smooth
sealing surface and reduces jamming or folding of the seal when it
changes the direction it is deflected.
[0593] Shore-A hardness: for example 60 Shore A--In testing of
O-rings this was found to provide the best trade-off between softer
materials that are "sticky" and cause the seal to extrude out of
its recess on insertion, and harder materials that are too plastic
and tear easily when assembled. The 60 Shore A for the given
material (silicone) provided a smooth insertion feel. This material
also has a higher elongation to break and tear resistance when
compare to the equivalent 70 Shore A grade. The non-sticky surface
finish will inhibit sticking of the seal to the liquid chamber port
over time. Shore hardness is specific to material choice, so it
will be appreciated that different Shore hardnesses will be
suitable for different materials such as nitrile, PTFE, EPDM
rubber, flurorcarbon, for example. Different Shore hardnesses may
also be suitable depending on the desired properties.
[0594] Stretch, non-stickiness, and toughness are desirable
material properties for the T-seal.
[0595] By inserting the base 2342T1 of the T-seal into the recess
2340R in the manifold gases outlet port 2340 of the removable elbow
2342, gas flow is prevented from getting under the seal and lifting
the base 2342T1 of the seal away from the elbow during use. The
ridges that are provided by the end walls at either end of the
recess minimise the likelihood of base lift of the seal or damage
when the liquid chamber is assembled with the removable elbow,
helping to locate the seal correctly and prevent movement of the
seal. The T-shape of the seal provides good resistance to
leakage.
[0596] The T-seal 2342T may be removable from the elbow 2342, to
enable the seal to be replaced when required.
[0597] In alternative configurations, the seal may be overmoulded
onto the removable elbow 2342 or other suitable component. By
overmoulding the seal onto the component, greater scope is provided
to alter the dimensions discussed above. For example, the base
width 2342T1' can be greatly decreased. The T-seal may no longer
rest within a recess 2340R in the removable elbow 2342, which means
that sealing can occur closer to the outer end of the manifold
gases outlet port 2340 without requiring the manifold gases inlet
port 2340 of the elbow to be pushed as far into the liquid chamber
gases outlet port 308, and/or the base 2342T1 of the seal will not
be lifted up during insertion/removal or due to flow beneath the
seal.
[0598] FIGS. 140 and 141 show an alternative configuration T-seal
2342T' in position on the gases inlet port 2340 of a modified
removable elbow 2342'. Unless described below, the features and
functionality are as described above, and like reference numerals
indicate like parts.
[0599] This configuration differs in that the T-seal 2342T' has an
asymmetric shape, with one side of the base 2342T1 being narrower
than the other side of the base 2342T1. In the configuration shown,
the width of the base 2342T1 on the side of the seal adjacent the
outer end of the inlet port 2340 is shorter than the width of the
base 2342T1 on the side of the seal located further from the outer
end of the inlet port. The dimensions and parameters may otherwise
be the same as described above. While a recess 2340R is provided in
the inlet port, that is a one-sided recess. The recess is open to
the outer end of the inlet port 2340, and an inner edge of the
recess 2340R forms a shoulder against the edge of the T-seal
2342T'. The overmoulding of the T-seal onto the inlet port 2340
means that the base 2342T1 of the T-seal 2342T' will not lift away
from the inlet port 2340 during removal or insertion of the outlet
port 2340 into the liquid chamber gases outlet port 308.
Alternatively, a recess 2340R may not be provided in the inlet
port, and the T-seal may be overmoulded directly onto the exterior
of the port.
[0600] FIGS. 142 and 143 show an alternative configuration seal
2342T'' in position on the gases inlet port 2340 of a modified
removable elbow 2342''. Unless described below, the features and
functionality are as described above, and like reference numerals
indicate like parts.
[0601] This seal 2342T'' is adapted T-seal that resembles an
L-seal, and has a generally L-shaped configuration, with the
annular base 2342T1 of the seal extending from only one side of the
radially extending annular rib 2342T3. In the configuration shown,
the base 2342T1 only extends from the rib 2342T3 in a direction
away from the edge of the inlet port 2340. With this configuration,
sealing can occur right at the outer edge of the inlet port 2340.
The dimensions and parameters may otherwise be the same as
described above. While a recess 2340R is provided in the inlet
port, that is a one-sided recess. The recess is open to the edge of
the inlet port 2340, and an inner edge of the recess 2340 forms a
shoulder against the edge of the T-seal 2342T''. The overmoulding
of the seal 2342T'' onto the inlet port 2340 means that the base
2342T1 of the seal 2342T'' will not lift away from the inlet port
2340 during removal or insertion of the outlet port 2340 into the
liquid chamber gases outlet port 308. Alternatively, a recess 2340R
may not be provided in the inlet port, and the T-seal may be
overmoulded directly onto the exterior of the port.
[0602] The liquid chamber gases outlet port 308 and/or gases inlet
port 2340 may be provided with one or more alignment features to
limit eccentricity between the two ports and thereby reduce loading
on the seal. FIG. 144 shows one example in which the alignment
feature comprises a mechanical standoff located in the gases inlet
port 2340. In the form shown, the mechanical standoff is provided
by an inner shoulder 2340R5 of the seal recess 2340R, which acts to
locate and align the ports during insertion so that the seal only
has to seal rather than align the ports or accommodate significant
loading from the ports. The mechanical standoff(s) can be located
either in front of or behind the sealing surface of the seal, and
could have any suitable form.
[0603] Utilising a flexible T-seal or L-seal provides a good seal
without requiring a high force to couple of the liquid chamber with
the removable elbow. The effective seal can be maintained over
time, whereas other types of seals such as O-ring seals may creep
or reduce sealing over time and require a compression fit.
[0604] Rather than being in the form of an elbow, the gasflow tube
1342, 2342, 2342', 2342'' could have any other suitable
configuration depending on the configuration of the apparatus. For
example, the gasflow tube could be substantially linear or a
non-liner configuration, with the manifold gases inlet port and the
patient outlet port at ends of the tube. The inlet and outlet ports
will typically be offset from each other. The direction of
insertion and removal of the gasflow tube into and from the
retainer (e.g. forward and rearward) may be at an angle to the
longitudinal axis 1340A, 2340A, so that the elbow can form a
connection with a desired orientation for coupling to the liquid
chamber. The retainer may be modified as required, depending on the
configuration of the gasflow tube.
7. Motor and/or Sensor Module--Alternative Configurations
[0605] FIGS. 78 to 100 show an alternative configuration removable
motor and/or sensor module or sub-assembly 1400 that can be used as
a flow generator in the flow therapy apparatuses described herein.
Unless described below, the sub-assembly has the features and
functionality described in relation to the sub-assembly of FIGS. 16
to 22f, and like reference numerals indicate like parts, with 1000
added to each reference numeral.
[0606] As discussed above, the motor and/or sensor module or
sub-assembly 1400 has been designed as an individual and sealed
component. Any seals that are breached will cause gases such as
oxygen to leak to the atmosphere rather than into the electronics
of the apparatus. The module 1400 is positioned in the apparatus
slightly off-centre so that it fits a filter and oxygen manifold
and is located close to the air/oxygen inlet arrangement 350 of the
apparatus. The module 1400 is configured to be replaceable, so if a
sensor fails the entire module can be replaced. The module may only
contain electronics relevant to sensing.
[0607] The motor and/or sensor module 1400 comprises a stacked
arrangement of three main components; a base 1403 of the
sub-assembly 1400 (on which is positioned the motor 1402 with an
impeller that forms a blower), an outlet gasflow path and sensing
layer 1420 positioned above the base 1403, and a cover layer 1440.
The cover layer 1440 and outlet gasflow path and sensing layer 1420
will typically be assembled together in use to form the sensing
layer. The gases move through the module 1400 substantially as
described above with reference to FIGS. 16 to 22f. An opening
formed between the blower 1402 and the outlet gasflow path and
sensing layer 1420 provides a gases inlet into the module and
enables the temperature of incoming gases to be measured.
[0608] The base 1403 comprises a region 1403A for receipt of the
gas blower motor 1402. The region 1403A may be concave. The
diameter of the concave region is selected to correspond with the
shape of the underside of the body 1408 of the motor 1402. The
region 1403A guides gasflow to the blower. Ribs on the underside of
the base 1403 give stiffness to the area and reduce noise in
combination with the shape of the concave region. In an alternative
configuration, the region 1403A may be a different shape, for
example a non-concave shape.
[0609] As shown in FIG. 79, the base 1403 comprises a plurality of
flexible mounts 1411. The flexible mounts act as vibration
isolating structures. Engagement plates 1411A are retained by the
upper casing of the motor/blower body 1408, and provide a slot into
which the mounts can slide. Any suitable number of flexible mounts
1411 may be provided. Upper ends of the mounts are received in
complementary receiving portions such as cups in a body 1422 of the
outlet gasflow path and sensing layer 1420.
[0610] As shown in FIGS. 78-82, 84, 85, and 88, the base 1403 and
the body 1422 of the outlet gasflow path and sensing layer 1420 are
provided with complementary securing features 1405, 1425 to secure
the body 1422 to the base 1403. The base 1403 comprises a plurality
of upstanding clips 1405 positioned at spaced apart locations
around the periphery of the base. The upper ends of the clips
comprise heads 1405A that are tapered toward their upper ends. The
heads are provided with recesses or cut-outs to provide a
substantially constant cross-sectional area in the plastic to
enable the plastic to cool quickly.
[0611] The body 1422 comprises a corresponding plurality of
receiver members 1425 at spaced apart locations around the
periphery of the body. The receiver members comprise apertures
1425A towards their lower ends, the apertures 1425A sized and
configured to receive the tapered heads 1405A of the clips. The
body 1422 can be secured to the base 1403 by moving the body and
the base towards each other so the clip heads 1405A are received in
the apertures 1425A. The body can be separated from the base by
moving the heads 1405A transversely so that they clear the
apertures 1425A, then moving the body away from the base.
[0612] The clips 1405 and receiver members 1425 may be positioned
at or close to the outer edge of the base 1403 and body 1422. There
will suitably be at least two clips and receiver members, but may
be three or more clips and receiver members. In the form shown, the
clips 1405 are located on opposite sides of the base 1403 and the
receiver members 1425 are located on opposite sides of the body
1422. The clips could alternatively be part of the body 1422 and
the receiver members part of the base 1403, or there could be a
combination of clips and receiver members mounted on both the base
1403 and the body 1422.
[0613] The clips 1405 and receiver members 1425 are configured to
be strong enough to enable the removable motor and/or sensor module
or sub-assembly 1400 to be removed from the housing as a single
part, but are not required to carry load once assembled. The clips
and receiver members could be used as the sole method of securing
the base and body, or they could be used in combination with other
fasteners such as screws or the like. Alternatively, a different
securing method could be used.
[0614] The base 1403 and body 1422 comprise a plurality of
vertically extending wall members 1407, 1427. The wall members are
complementary with each other and the upper ends of the lower wall
members 1407 engage with the lower ends of the upper wall members
1427 when the base 1403 is secured to the body 1422, to prevent
rocking of the body 1422 relative to the base 1403. There will be
at least two wall members at spaced apart locations around the body
and base, but may be three or more wall members. The wall members
may be provided on either side of the clips to help the clips to
engage more securely, thereby providing a more stable assembly
which is less likely to rock. The length and/or shape of the wall
members may vary. An aperture 1427A is positioned in one of the
wall members or between two of the wall members, to receive a
temperature sensor for determining the temperature of incoming
gases. Alternatively, the temperature sensor may be positioned
elsewhere.
[0615] The base 1403 and/or body 1422 also comprise a plurality of
locating pins 1412 to guide the base and body together during
coupling. There will suitably be at least two locating pins 1412 to
provide rotational and vertical locating, but there may be three or
more pins 1412.
[0616] A periphery 1403B of the base 1403 is provided with a recess
that receives a soft seal such as an O-ring seal 1403C. The seal
1403C seals the module 1400 against the housing of the apparatus
and prevents atmospheric air entrainment which would bypass the
filter. In particular, the seal 1403C seals between the base 1403
and the peripheral wall of the recess 250 of the apparatus housing.
The seal 1403C also provides a force between the module 1400 and
the housing of the apparatus that must be overcome to remove the
module 1400 from the housing.
[0617] As shown in FIG. 83, the underside of the base 1403 is
scalloped and is provided with a plurality of strengthening ribs
1403D to provide structural strength and stability. The ribs are
shown in a radial arrangement, but may be in any suitable
configuration. One edge (the lower edge shown in FIG. 83) of the
periphery 1403B is substantially linear to accommodate the shape of
an oxygen inlet manifold in the apparatus. The sides of the
peripheral edge may be tapered to assist with tooling. An aperture
1403E is provided in a projecting portion of the base 1403, to
enable the module 1400 to be fastened to the housing of the
apparatus using a fastener such as a screw for example.
[0618] Once gases enter the module 1400 via the inlet region, they
move to the blower inlet, which is located underneath the blower
1402 in the concave portion 1403A of the base 1403. Gases entering
the module may act to cool the motor. Gases then move through the
blower 1402 and exit via the blower gases outlet port 1406. Gases
exiting the blower gases outlet port 1406 enter a coupling tube or
cuff 1409 which couples the blower gases outlet port 1406 to a
gases inlet port 1430 of the outlet gasflow path and sensing layer
1420. The cuff has a gases inlet port 1409A that is coupled to the
blower outlet port 1406, an arcuate body portion 1409B that directs
the gases upwardly away from the gases inlet port 1409A, and a
gases outlet port 1409C that delivers gases to the gases inlet port
1430 of the outlet gasflow path and sensing layer 1420. The arcuate
body portion of the cuff directs the gases through an angular
change of about 90 degrees from the blower outlet port 1406 to the
gases inlet port 1430, but over a short horizontal distance, while
minimising pressure drop. In one configuration, the maximum
pressure drop between the blower outlet port 1406 and a centre of
the gasflow path 1426, 1446 is a maximum of 2.5 cm H.sub.2O.
[0619] It will be appreciated that the cuff can be configured to
direct gases through different angles depending on the required
configuration. The inlet 1409A and outlet ports 1409C of the cuff
1409 will be sealed to the blower outlet port 1406 and gases inlet
port 1430 using a suitable sealing arrangement; for example, soft
seals such as O-ring seals.
[0620] The cuff 1409 is configured to minimise the pressure drop of
the gases passing though the cuff and to isolate blower vibration
from the case of the unit in tight space constraints. The cuff is
made from a soft flexible material and has localised region(s) that
act as a diaphragm and serve as vibration isolators. Some regions
of the cuffs may be thinned out to provide isolation to prevent or
minimise any vibration from being transmitted to structural parts.
This could be achieved by moulding thinner section(s) into the
cuff. Additionally, or alternatively, a concertina may be provided
in the cuff to assist with isolating vibrations from the case of
the unit while allowing more movement of the module 1400 in the
housing.
[0621] The base 1403 comprises an upstanding cuff support member
1407A projecting upwardly at or adjacent the periphery of the base.
The cuff support member 1407A has an inwardly concave shape when
viewed in overhead plan view, and is configured to receive and
support the periphery of the cuff 1409. As shown in FIG. 82 for
example, the gases outlet port 1409C end of the cuff comprises an
enlarged diameter that rests on the upper end of the cuff support
member 1407A. The cuff support member 1407A holds the flexible cuff
1409 in a desired position and helps prevent the cuff from being
blown off the inlet 1430 under pressurised flow. The centre of the
cuff may be more flexible than either end of the cuff. The cuff may
be manufactured from a low compression set material that reduces
creep and allows the neck of the cuff to be stretched over and onto
the port and held firmly in place. The cuff may be provided with
one or more grab tabs to aid with the assembly process. The grab
tab(s) may be provided on any suitable region of the cuff. However,
the grab tabs will generally be positioned so as to not
obstruct/interfere gasflow in the region where air and/or oxygen or
other gases enter the motor and/or sensor module 1400. In one
example, a grab tab may be positioned near an upper edge of the
cuff. In another example, the grab tab may be positioned elsewhere
on the cuff.
[0622] As an alternative to grab tab(s), edge(s) of the cuff may be
chamfered to assist with putting the cuff in place.
[0623] The gasflow path and sensing layer 1420 comprises a gasflow
path with one or more sensors, the gasflow path is arranged to
deliver gas to the outlet port of the housing.
[0624] A body 1422 of the gasflow path and sensing layer 1420
defines a lower portion 1426 of a sensing and gasflow path. The
cover layer 1440 has a body 1442 that defines the upper portion
1446 of the sensing and gasflow path, with the shape of the upper
and lower portions 1426, 1446 corresponding substantially to each
other. Therefore, while FIGS. 84 and 85 schematically show the
upper portion 1446 of the sensing and gasflow path, that will only
be present when the cover layer 1440 is coupled to the body 1442,
as will be clear from the cover layer shown in FIGS. 93 to 95.
[0625] As shown in FIGS. 88 and 89, the sensing and gasflow path
comprises an arcuate elongate gasflow portion 1428, 1448. Recesses
1433, 1453, 1434, 1454 may be provided adjacent opposite ends of
the arcuate elongate portion of the sensing and gasflow path.
[0626] In the form shown, the arcuate elongate gasflow portion
1428, 1448 is curved. In the form shown, the arcuate elongate
gasflow portion has a length of about 85 mm. In the form shown, the
ends of the gasflow path are more arcuate (i.e. have a tighter
radius) than the centre, which is still arcuate but more linear.
The gasflow path is curved to minimise the pressure drop of the
gases as they travel along it, and yet to direct the gases through
the module, which requires the gases to turn sharply several times.
The curve helps to smooth the sharp turns as the gases move through
the module. The gases enter the arcuate gasflow path shortly
after/as they leave the cuff 1409.
[0627] An intermediate portion 1428A, 1448A of the gasflow path has
a smaller diameter than portions on either end of the intermediate
portion. Therefore, the gasflow path tapers inwardly slightly
before widening again, to speed up flow going through the flow
path.
[0628] A gasflow outlet port 1452 extends vertically through the
body 1442 of the cover layer 1440, and is located at or adjacent an
end of the arcuate elongate gasflow portion 1428, 1448 opposite to
the inlet port 1430.
[0629] The sensing and gasflow path has a curved shape. The gas
flow enters at inlet port 1430, flows along a curved sensing and
gasflow path, and exits on the opposite side of the sensing and
gasflow path at outlet port 1452. In some configurations, the
entrance and exit may be positioned in vertically opposed
directions, and the gas flow may enter the path in a vertical
upwards direction, then curve around to a horizontal direction, and
then curve around to a vertical upwards direction again. In some
configurations, the sensing and gasflow path does not have sharp
turns. In some configurations the sensing and gasflow path has
curved ends with a straighter middle section. In some
configurations, the sensing and gasflow path maintains a constant
cross-section shape throughout the length of the flow path. In some
configurations, the sensing and gasflow path tapers inward slightly
from the first end of the sensing and gasflow path, and widens
again to the second end of the sensing and gasflow path, which can
speed up the flow. In some configurations, the surface of the
sensing and gasflow path is lined with a surface modifier/lubricant
to reduce friction within the sensing and gasflow path. A curved
flow path shape can reduce a gas flow's pressure drop. A number of
different flow path configurations could be used.
[0630] The sensing and gasflow path 1426, 1446 has a total distance
between opposite ends of the arcuate elongate gasflow portion 1428,
1448 (between the closest portions of recesses 1433, 1453, 1434,
1454) of between about 10 mm and about 1000 mm, between about 40 mm
and about 200 mm, between about 50 mm and about 150 mm, between
about 70 mm and about 120 mm, between about 80 mm and 100 mm, or
between any of the foregoing values, or about 95 mm.
[0631] The sensing and gasflow path 1426, 1446 can have a diameter
greater than about 2 mm and less than about 100 mm, between about 5
mm and about 50 mm, between about 10 and about 30 mm, between about
15 and about 25 mm, between any of the foregoing values, or about
16 mm. Decreasing the diameter of the flow path can increase the
gas velocity at high flows beyond useful velocities and can lead to
pressure drops. Increasing the diameter of the flow path can take
up more space in the system. Thus, an optimal balance can be
obtained according to the ranges described above. Equivalent ranges
can be used with devices that have different flow
configurations.
[0632] A slot 1422C is provided in the body 1422 to pass wires from
the blower 1402 to a sensing printed circuit board (PCB) 1456. At
least part of the PCB overlaps with the gas flow path through the
gasflow path and sensing layer 1420. The PCB 1456 is sandwiched
between the gasflow path sensing layer 1420 and cover layer 1440.
Temperature sensors will be positioned on the portion of the PCB
that is within/overlaps with the gasflow path. As shown in FIG.
100, the PCB 1456 comprises a recess 1457 with an arcuate portion
1457A that is a complementary shape to the curvature of the outer
edge of the arcuate elongate gasflow portion 1428, 1448. A
projecting portion 1456A of the PCB carries the electronics of the
PCB, and is configured to be positioned externally of the flow
path.
[0633] As shown in FIGS. 88 and 89, an upper side of the body 1422
of the layer 1420 is provided with a groove 1423 for receipt of a
soft seal such as an O-ring 1423A to seal against an underside of
the PCB 1456. A lower side of the body 1442 of the cover layer 1440
is provided with a groove 1443 for receipt of a soft seal such as
an O-ring 1443A to seal against the upper side of the PCB 1456. The
grooves 1423, 1443 are advantageously provided with
inwardly-directed projections 1423B, 1443B (shown more clearly in
FIG. 99) to assist with maintaining the O-ring seals in position in
the grooves.
[0634] The soft seals 1423A, 1443A seal the high pressure region of
the module, as gasses passing through the gasflow path have been
pressurised by the blower. The seals 1423A, 1443A prevent gases
from escaping and moving towards the electronics of the apparatus.
The soft seals could alternatively be co-moulded to the bodies 1422
and 1442, with a soft layer co-moulded onto the more rigid
bodies.
[0635] As shown in FIG. 92, the lower surface of the body 1422 is
provided with a plurality of stiffening ribs 1422B in any suitable
configuration, to decrease warping.
[0636] As discussed in relation to the configurations above, the
electronics of the apparatus are positioned in the low pressure
region of the housing to cause a tortuous path which decreases the
likelihood of liquid or oxygen ingress to the electronics. The
portion of the PCB 1456A comprising the electronics components is
positioned `outside` the O-rings. The portion of the PCB 1456
comprising the sensors is inside the flow path and is sealed from
the outside by the O-rings 1423A, 1443A pressing tightly against
the PCB 1456. Therefore, liquid or oxygen ingress may be at least
substantially prevented.
[0637] The cover layer 1440 may be coupled to the gasflow path and
sensing layer 1420 using fasteners such as screws. The fasteners
sandwich the two sections together providing a compressive force to
seal the soft seals 1423A, 1443A against the PCB board 1456. Any
suitable number of apertures 1422A, 1442A (FIGS. 88 and 89) may be
provided for receipt of the screws. Washers could be used on the
underside of the screws. To minimise the chance of leakage around
the screws to the low pressure region (which could impact
performance), ridges could be added to the bosses on which the head
of the screw will sit once inserted. Alternatively, once the screws
have been inserted, adhesive or filler could be used to seal any
possible openings. Alternatively, the cover layer 1440 could
comprise clips or adhesive features to couple with the gasflow path
and sensing layer 1420 to seal between the layers when force is
applied.
[0638] As shown in FIGS. 93 and 94, the upper surface of the
covering layer 1440 is provided with a plurality of stiffening ribs
1442B in any suitable configuration, to decrease warping. The
covering layer 1440 is provided with a projecting portion 1441A
that covers the projecting portion 1456A of the PCB, to protect the
electronics of the PCB. The covering layer 1440 also has a
projecting portion 1441B to cover and protect an electrical
connection to the PCB.
[0639] The cover layer 1440 is provided with a shroud 1441C on the
projecting portion 1441A, for receipt of an electrical component
such as an edge card/connector of the PCB 1456. The edge
card/connector may be directly connected to the PCB 1456 or may be
connected by wires. The edge card/connector may be used to
electrically couple the blower motor to the electronics of the main
apparatus. The shroud is shown most clearly in FIGS. 93-95 and is
configured to at least partly surround and protect the electrical
component, the shroud may be configured to support the electrical
component but to enable movement of the electrical component in the
shroud in at least one dimension. In the form shown, an upper part
of the shroud 1441C is open.
[0640] The shroud 1441C comprises an elongate body with a long
dimension 1441D and a short dimension 1441E. Slots 1441F are
provided adjacent each end of the body to receive the ends of the
edge card/PCB. Sides of the body are provided by two resilient
supports 1441G that support opposing faces of the edge card
connector.
[0641] In some configurations, the shroud 1441C is configured to
enable movement of the edge card/connector in one dimension. For
example, the shroud 1441C may be configured to enable movement of
the edge card/connector transversely (in the short dimension 1441E
of the shroud) due to the resilient supports 1441G, or may be
configured to enable movement of the edge card/connector in the
long dimension 1441D of the shroud, if the length of the edge
card/connector is shorter than the distance between the ends of the
slots 1441F. The PCB/edge card could alternatively be the same
length as the long distance 1441D between the slots, and therefore
less free to move.
[0642] In some configurations, the shroud 1441C is configured to
enable movement of the electrical component in two dimensions. For
example, the shroud may be configured to enable movement of the
edge card/connector transversely (in the short dimension 1441E of
the shroud) due to the resilient supports 1441G, and may be
configured to enable movement of the edge card/connector in the
long dimension 1441D of the shroud, if the length of the edge
card/connector is shorter than the distance between the ends of the
slots 1441F. The PCB/edge card could alternatively be the same
length as the long distance 1441D between the slots, and therefore
less free to move.
[0643] In this application, the shroud does not provide for
vertical movement of the edge card/connector. In an alternative
configuration, the shroud 1441C is configured to enable movement of
the electrical component in three dimensions. For example, the
shroud may be configured to enable movement of the edge
card/connector transversely (in the short dimension 1441E of the
shroud) due to the resilient supports 1441G, may be configured to
enable movement of the edge card/connector in the long dimension
1441D of the shroud, if the length of the edge card/connector is
shorter than the distance between the ends of the slots 1441F, and
may be configured to enable vertical movement of the edge
card/connector. The PCB/edge card could alternatively be the same
length as the long distance 1441D between the slots, and therefore
less free to move.
[0644] The shroud may be configured to allow limited movement of
the edge card/connector in at least one dimension, the limited
movement being sufficient to accommodate tolerance misalignment in
components.
[0645] Once gases have passed through the gasflow path and sensing
layer 1420, they exit the module 1400 via the gasflow outlet port
1452 which couples with the gasflow inlet elbow 324. A soft seal
such as an O-ring seal 1452A may be provided to seal the gasflow
outlet port 1452 of the module 1400. As shown in FIG. 96, the soft
seal 1452A seals against an inner wall of a downward outer
extension tube or conduit 133 of the housing, or another part of
the housing. A soft seal such as an O-ring seal 324A may be
provided to seal between the elbow 324 and the inner wall of the
downward extension tube 133 of the housing, or another part of the
housing. The soft seals function to keep the module 1400 sealed and
reduce the likelihood of the pressurised gases flowing into the
housing of the apparatus. The soft seals may be provided in annular
grooves in the gasflow outlet port 1452 and the gasflow inlet elbow
324. Alternatively, one of both of those components may be provided
with outwardly directed shoulders to provide a resting surface for
the soft-seals. For example, the seal 1452A may rest on top of a
shoulder 1452B on the gasflow outlet port 1452, and the soft seal
324A may rest under a shoulder 324B on the gasflow inlet elbow 324,
as shown in FIG. 96.
[0646] In another configuration, a different type of seal may be
provided to seal between the gasflow outlet port 1452, the gasflow
inlet elbow 324, and/or the outer extension tube/housing 133. For
example, rather than using O-rings, face seal(s), foam, or a
bellows seal may be used, which will allow for some relative
movement of the components in a direction that is lateral to a
gasflow direction through the components, without breaking the
seal. A seal that enables that movement will not over-constrain the
module 1400 when it is in place in the lower chassis, but will
enable sealing between the upper surface of the gasflow outlet port
1452 and the bottom surface of the inlet elbow 324, while enabling
some lateral movement between the gasflow outlet port 1452 of the
module 1400 and the inlet elbow 324. If a bellows seal is used to
seal between the gasflow outlet port 1452 and the inlet elbow 324,
that will enable both some lateral and some axial movement between
the gasflow outlet port 1452 of the module 1400 and the inlet elbow
324.
[0647] The connection between the gasflow outlet port 1452 and
gasflow inlet elbow 324 is formed outside the motor and/or sensor
module 1400 such that any leakage that occurs from this connection
will be directed outside the housing of the apparatus. Because the
lower chassis extends up around the outside of the inlet elbow 324,
and is formed as a single integral part including the walls and
ceiling that define the recess 250 and gasflow tube 264 in the case
of a leak the gas will follow the path of least resistance, which
is to gather outside the leak region and exit to atmosphere via the
outside of the inlet elbow 324. It is very unlikely that gases will
flow into the housing and via a tortuous path to the electronics of
the apparatus.
[0648] The PCB and other components of the module 1400 may be
provided with reliefs or recesses as shown in various figures, to
assist with mounting the components or to provide relief for other
adjacent components.
[0649] The overall flow of gases through the module 1400, once the
gases have entered the module, is represented by the arrows in FIG.
97. If the pressure drop is assumed be of the form P=kQ.sup.2 where
Q is the flow in L min.sup.-1, P is the pressure in Pa, and k is a
pressure drop coefficient, then the pressure drop coefficient from
the blower outlet port 1406 to the gasflow outlet port 1452 of the
module will be between about 5 mPa (L min.sup.-1).sup.-2 and about
50 mPa (L min.sup.-1).sup.-2, in one configuration between about 10
mPa (L min.sup.-1).sup.-2 and about 20 mPa (L min.sup.-1).sup.-2,
and in one configuration about 15 mPa (L min.sup.-1).sup.-2.
Equivalently, the pressure drop, at 100 L min.sup.-1, will be
between about 50 Pa and about 500 Pa, in one configuration between
about 100 Pa and about 200 Pa, and in another configuration about
150 Pa. The inlet to the module/blower may add a small pressure
drop, but that small drop may be negligible.
[0650] It will be appreciated that the module 1400 may have any of
the alternative configurations described above for module 400.
8. Alternative Configurations
[0651] FIGS. 101 to 179 show features of an alternative
configuration flow therapy apparatus 3010'. The flow therapy
apparatus 3010' may have any of the features and/or functionality
described herein in relation to other configurations, but those
features are not repeated here for simplicity. Generally, like
numerals are used to indicate like parts to the configurations of
FIG. 2 to 54 or 55 to 64, with 3000 added to each reference
numeral. Similarly, the features and/or functionality of this
alternative configuration apparatus 3010' may be used in the other
apparatuses described herein.
[0652] FIGS. 101 to 117 show details of the handle arrangement of
the flow therapy apparatus 3010', with the handle arrangement
having an alternative configuration handle/lever 4500. For the
features that are shown in these figures, like numerals indicate
like parts to FIGS. 55 to 64, with 3000 added to each reference
numeral.
[0653] Similar to the configuration of FIGS. 55 to 64, the
handle/lever 4500 is a single sided configuration. That is, only
one side of the handle/lever 4500 is movably connected relative to
the main housing of the flow therapy apparatus 3010', whereas there
is no pivot connection of the other side of the handle/lever 4500
to the main housing. In the form shown, the left side of the
handle/lever 4500 is pivotally connected relative to the main
housing. However, in an alternative configuration, only the right
side may be pivotally connected to the main housing. This
configuration differs from that of FIGS. 55 to 64, in that the
handle is pivotally and translationally connected to the main
housing, so that the handle moves on a path having a varying radius
relative to the main housing. The handle/lever 4500 and main
housing are modified from those described above to provide that
pivotal and translational connection.
[0654] The handle/lever 4500 has a left side arm 4502 that is
pivotally and translationally attached relative to the left inner
side wall 3112' of the upper chassis 3102'. The left side arm 4502
is configured to be substantially flush with the interconnecting
wall 3114' when the handle 4500 is in the lowered or closed
position of FIG. 101. Rather than a right side arm, the
handle/lever further comprises a right side member 4504 that is
shorter than the left side arm 4502, and that is not pivotally
attached to the right inner side wall 3118' of the upper chassis
3102'. The right side member 4504 is configured to be substantially
flush with the interconnecting wall 3120' when the handle 4500 is
in the lowered or closed position of FIG. 101. The main housing is
provided with recesses to enable the left side arm 4502 and right
side member 4504 to be substantially flush with the interconnecting
walls. In the form shown, the left side member 4502 is longer than
the right side member 4504, so a spacer member 3120'' is mounted to
the upper chassis 3102' and sits substantially flush with the
interconnecting wall 3120' and the right side member 4504 when the
handle 4500 is in the lowered or closed position. The spacer member
3120'' may carry a label or other indicia with information
representing the device and/or its user.
[0655] A terminal part of the handle has a cross-member handle
portion 4506 that interconnects the forward ends of the left side
arm 4502 and the right side member 4504 and forms an engagement
region for grasping by a user's fingers. When the handle 4500 is in
the raised position as shown in FIG. 111 for example, the
cross-member 4506 can act as a carrying handle for the apparatus
3010'. With the configuration shown, when the handle is in the
fully raised position, the cross-member 4506 is positioned
generally above and generally in line with the centre of gravity of
the apparatus (including the liquid chamber). In one configuration,
the cross-member 4506 may be positioned substantially directly
above and substantially directly in line with the centre of the
gravity of the apparatus. The liquid chamber 300'--shown in FIG. 55
for example--can be inserted into or removed from the chamber bay
3108' when the handle/lever 4500 is raised. When the handle/lever
4500 is in the lowered position, it inhibits or prevents removal of
the liquid chamber 300' from the chamber bay 3108'.
[0656] Rather than having the right side member 4504, the
handle/lever 4500 may terminate at the right side of the
cross-member 4506. However, having the rearwardly directed member
4504 is preferred, as it reduces the likelihood of the apparatus
3010' being dropped while it is being carried.
[0657] In the closed or fully lowered position of the handle/lever
4500 shown in FIG. 101, the cross-member 4506 is located in the
recess 3242' at the front of the main housing and encloses a
portion of the chamber bay. The main housing may be formed with
upper and lower chassis parts 3102', 3202', and the recess 3242'
will be formed in the appropriate chassis part. In the form shown,
both chassis parts have a corresponding recess. The handle/lever
4500 and/or recess 3242' may have a positive engagement feature,
such as one of those described above, to positively engage the
handle/lever 4500 in the lowered or closed position. With the
handle/lever 4500 in the lowered or closed position, a portion of
the cross-member 4506 projects sufficiently above the floor of the
chamber bay 3108' and above the flange 310' of the liquid chamber
300' that it prevents the liquid chamber 300' from being slid
forward and removed from the liquid chamber bay 3108'. The liquid
chamber bay 3108' comprises guide rails 3144, 3146 to prevent the
liquid chamber 300' from being lifted and removed vertically from
the liquid chamber bay 3108' when the handle/lever 4500 is in the
lowered or closed position.
[0658] The guide rails 3144, 3146 may have a curved shape and/or
upwardly angled leading portions 3144a (FIG. 102) to assist with
easing the liquid chamber 300' into the liquid chamber bay 3108'.
Alternatively, or additionally, the guide rails 3144, 3146 may be
oriented to be non-parallel with a base of the chamber bay 3108',
and thereby with the heater plate. In particular, the guide rails
may be oriented so that a major part of the length of the guide
rails is oriented so that the front of that major part is
positioned further from the base of the liquid chamber 3108', than
the rear of the major part. That is, the front of that major part
is higher than the rear of that major part, to guide the base of
the liquid chamber 300' into tighter engagement with the heater
plate, as the liquid chamber is inserted into the chamber bay
3108'. This may be instead of, or in addition to, the upwardly
angled leading portions 3144a of the guide rails. The guide rails
help with usability of the apparatus as they guide the user while
inserting the liquid chamber 300' into the liquid chamber bay
3108'.
[0659] FIGS. 102 to 114 show details of the pivot arrangement of
the handle/lever 4500. A rearward portion of the left side arm 4502
is connected to a pivot arm 4502d. The pivot arm 4502d comprises a
forward arcuate portion 4502e that extends downwardly and
rearwardly from the left side arm 4502 when the handle is in the
lowered or closed position. A rearward part of that forward arcuate
portion 4502e is connected to a body portion 4502f that extends
upwardly and forwardly therefrom when the handle is in the lowered
or closed position. The body portion 4502f has a tapered
configuration with a base of the body portion being relatively
small and an upper terminal portion of the body portion being
relatively large. The body portion 4502f is relatively large so as
to provide additional mass to help stabilise the handle in the
raised position and reduce side-to-side movement of the handle in
that position.
[0660] A spacing is provided between the majority of the pivot arm
4502d and the body portion 4502f. An upper end of the body portion
4502f comprises two pivot protrusions, a rear, outwardly directed,
first pivot protrusion 4502b' and a forward, inwardly directed,
pivot protrusion 4502b''.
[0661] The rear pivot protrusion 4502b' is received in a first
pivot cavity 4502c'. The first pivot cavity 4502c' comprises a slot
or a channel, and is a substantially vertically extending pivot
cavity. The first pivot cavity is generally straight so that the
rear pivot protrusion 4502b' follows a substantially linear path LP
as the handle is moved between the lowered position and the raised
position. The rear pivot protrusion 4502b' is configured to be
retained in the first pivot cavity 4502c', but to substantially
freely move along the length of that pivot cavity.
[0662] The front pivot protrusion 4502b'' is received in a second
pivot cavity 4502c''. The second pivot cavity comprises a slot or a
channel, and is a relatively horizontal pivot cavity extending
substantially in a forward-rearward direction of the apparatus. The
second pivot cavity 4502c'' is generally arcuate so that the front
pivot protrusion 4502b'' follows a substantially arcuate path AP as
the handle is moved between the lowered position and the raised
position. In the form shown, the second pivot cavity 4502c''
substantially follows the curvature of the left side
interconnecting wall 3114', and has a convex curvature relative to
a position above the pivot cavity. The front pivot protrusion
4502b'' is configured to be retained in the second pivot cavity
4502c'', but to substantially freely move along the length of that
pivot cavity.
[0663] In the form shown in FIG. 106, the upper end of the first
pivot cavity 4502c' is located at a height higher than a
corresponding portion of the second pivot cavity 4502c'', where the
two pivot cavities overlap in side view (represented by an X in
FIG. 106). The position represented by an X is referred to herein
as the origin.
[0664] The rear and front pivot protrusions 4502b', 4502b'' may
comprise pins that are received in corresponding apertures in the
body portion 4502f of the handle. Alternatively, the pivot
protrusions may be integrally formed with the body portion
4502f.
[0665] The apparatus comprises a handle retainer 4498, which is
shown most clearly in FIGS. 102, 103, and 104. The handle retainer
comprises a substantially hollow body that has an upper edge 4498a
corresponding substantially in shape to the underside of the
interconnecting wall 3114'. However, the handle retainer 4498
projects further forward than a front edge of the interconnecting
wall 3114', so that an aperture 4498b in the handle retainer 4498
is positioned in front of the interconnecting wall 3114'. The shape
of the aperture 4498 corresponds substantially to that of the
forward arcuate portion 4502e of the pivot arm. The aperture 4498b
is sized so as to be only slightly larger than that of the forward
arcuate portion 4502e of the pivot arm, so that there is no space
for foreign objects to be entered into the aperture when the handle
is raised. The positioning of the handle 4500 relative to that
aperture 4498b is shown in FIGS. 115, 116, and 117.
[0666] The handle retainer 4498 comprises a base wall that opens
into a liquid drain channel 4498c that extends down the side of the
housing. The liquid drain channel 4498c may be in communication
with a cavity in the base of the main housing (as shown in FIGS.
115 and 116), so that any liquid that enters the handle mechanism
can drain through the liquid drain channel 4498c and exit through
the base of the main housing. The handle retainer provides a
diffusion based mechanism to remove liquid/gas. Additionally, the
holes in the chassis parts for receipt of the handle
retainer/handle are small and self-contained and are spaced apart
from sources of gas to reduce the likelihood of gas leakage into
the case of the apparatus. Apertures do not need to be punched into
the walls of the chassis parts for receipt of the handle
pivots.
[0667] The handle retainer 4498 seals between the upper chassis
3102' and the lower chassis 3202' in the region of the handle
retainer. In an alternative configuration, the handle retainer 4498
could seal against the upper chassis 3102' and/or the handle 4500
to prevent liquids/gases from entering the case or the handle
retainer. Face seals, convoluted path seals, and/or tongue and
groove arrangements could be provided for example.
[0668] As shown in FIG. 104, an inner portion of the left side wall
of the handle retainer 4498 comprises a channel that forms a base
4498d' of the first pivot cavity 4502c'. As shown in FIG. 103, an
underside 4498d'' of an outer wall portion of the upper chassis
part 3102' forms an upper edge of the first pivot cavity
4502c'.
[0669] As shown in FIG. 104, an inner portion of the right side
wall of the handle retainer comprises a ledge 4498e' that forms a
base of the second pivot cavity 4502c''. As shown in FIG. 103, an
underside 4498e'' of an inner wall portion of the upper chassis
part 3102' forms an upper edge of the second pivot cavity
4502c''.
[0670] To mount the handle 4500 to the apparatus, the handle 4500
is positioned in the handle retainer 4498 so that the second pivot
protrusion 4502b'' is positioned on the ledge 4498e' and so that
the first pivot protrusion 4502b' is positioned in the channel
4498d'. The handle and handle retainer can then be moved into
engagement with the upper chassis part 3102' such that apertures
4498f' in the handle retainer are aligned with apertures 4498f'' in
the upper chassis part 3102', and fasteners such as screws or the
like are used to fasten the components together. Therefore, the
handle retainer 4498 becomes part of the main housing of the
apparatus when the handle retainer is fixed to the upper chassis
part.
[0671] Movement of the pivot protrusions 4502b', 4502b'' and the
handle 4500 can be split into several phases. Those phases are
shown in FIGS. 108 to 112, and are represented graphically in FIG.
113. Referring to FIG. 113, the path of movement of the terminal
end 4506 of the handle relative to the apparatus housing is shown
by curve TEP. That path has a varying radius of movement of the
terminal end of the handle from a fully lowered to a fully raised
position. In the form shown, the path is generally elliptical; that
is, it follows the shape of a part of an ellipse. In the form
shown, the path corresponds to slightly over one quarter of an
ellipse. The radial lines represent a general transition point from
one phase to another or indicate the beginning and ending of a
phase relative to the position of the end of the handle.
[0672] FIG. 108 shows the handle as it has been moved away from a
fully lowered position. During this first phase P1 of movement, the
second pivot protrusion 4502b'' remains at the terminal forward end
of the second pivot cavity 4502c''. The first pivot protrusion
4502b' is caused to translate downward toward the origin X. This
urges the end 4506 of the handle forward and upward away from the
lowered/closed position. Because the first pivot protrusion 4502b'
is initially positioned above the origin X, the initial movement of
the terminal end of the handle 4500 is out and away from the
housing so that the handle does not collide with the housing at
either end.
[0673] FIG. 109 shows the handle as it has been moved further away
from the closed position. During this second phase P2 of movement,
the first pivot protrusion 4502b' has translated further downward
in the first pivot cavity 4502c' relative to the housing, toward
the lower terminal end of the first pivot cavity 4502c'. The second
pivot protrusion 4502b'' has started to translate rearwardly along
the second pivot cavity 4502c''. This results in a relatively steep
upward and rearward movement of the terminal end 4506 of the handle
relative to the housing.
[0674] FIG. 110 shows the handle as it has been moved further away
from the closed position. During this third phase P3 of movement,
the first pivot protrusion 4502b' has reached the lower terminal
end of the first pivot cavity 4502c'. The second pivot protrusion
4502b'' has translated further rearwardly in the second pivot
cavity 4502c'' to pass through the origin X. This has resulted in a
relatively flat upward and rearward movement of the terminal end
4506 of the handle relative to the housing.
[0675] As shown in FIG. 111, during the third phase P3 of movement,
after passing the origin X the second pivot protrusion 4502b'' has
reached an engagement feature 4502ef at or adjacent a rear end of
the second pivot cavity 4502c''. The purpose of the engagement
feature 4502ef is to retain the second pivot protrusion 4502b'' in
position at or adjacent the rear end of the second pivot cavity
4502c''.
[0676] The engagement feature 4502ef is shown in more detail in
FIG. 112. In the form shown, the engagement feature comprises a
step 4502ef' in the base of the second pivot cavity 4502c''
followed by a region 4502ef'' of decreased depth. As the handle
4500 reaches its fully raised position, the second pivot protrusion
4502b'' moves over the step 4502ef' and into engagement with the
region 4502ef'' of decreased depth. While the second pivot
protrusion can move substantially freely over most of the length of
the second pivot cavity 4502c'', the second pivot protrusion
4502b'' is a tight fit in the region 4502ef'' of decreased depth.
This arrangement biases the handle into the fully raised position
in which the user can carry the apparatus, without fear of the
handle moving from the fully raised position. When the user has
finished transporting the apparatus, a force can be applied to the
handle in the forward direction of the apparatus, to remove the
second pivot protrusion 4502b'' from the region 4502ef'' of
decreased depth.
[0677] The above describes one exemplary engagement feature 4502ef,
and other feature(s) could be used. For example, a spring-loaded
retainer could be provided to engage the handle in the fully raised
position. Additionally or alternatively, the handle may be provided
with an actuator such as a user-actuable button, to enable the user
to urge the first pivot protrusion away from the engagement feature
and/or to release the spring-loaded retainer. As another example,
an engagement feature such as any of those described could be used
to retain the handle in the fully lowered position, either in
addition to or instead of retaining the handle in the fully raised
position.
[0678] The handle 4500 is designed so that when the handle is in
the fully raised position and is being used to carry the apparatus
3010', the handle is located generally above the centre of gravity
of the apparatus including a liquid chamber containing liquid. This
reduces swinging of the apparatus as the apparatus is being
carried, making the apparatus easier to carry and reducing the
likelihood that liquid will enter the apparatus from the liquid
chamber. The apparatus may be configured so that the raised handle
is over or generally over the centre of mass with a full liquid
chamber inserted. The apparatus is heaviest with a full liquid
chamber, and that is when liquid is most likely to spill back into
the apparatus. Alternatively, the apparatus may be configured so
that the raised handle is over or generally over the centre of the
mass of the apparatus with a partially full liquid chamber
inserted, such as a half-full liquid chamber for example.
[0679] Depending on whether the fully raised handle is positioned
directly over the centre of mass of the apparatus, or close to that
position, the base of the apparatus may sit substantially flat
while the apparatus is being carried, or alternatively may be
slightly angled while the apparatus is being carried. The force
provided by the user in holding the apparatus is not offset
significantly from the centre of mass. This also means that the
liquid in the liquid chamber 300' remains substantially horizontal,
reducing the risk of liquid flow into the gasflow path. The
generally elliptical movement path of the handle 4500 enables the
handle to move from the fully lowered position to a fully raised
position located generally above and generally in-line with the
centre of mass. Additionally, the movement path is such that there
is a substantially constant spacing between the handle and an upper
portion of the housing, at least between a half-raised position
(FIG. 117) and fully raised position (FIG. 116) of the handle, to
minimise possible pinch points between the handle and the
housing.
[0680] The handle is designed so that the pivot protrusions 4502b',
4502b'' do not carry the apparatus load when the handle is in the
fully lowered position or in the fully raised position. When the
handle is in the fully lowered position, the load is carried by a
front wall 4498g of the handle retainer, which engages against a
lower edge of the forward arcuate portion 4502e of the handle. When
the handle is in the fully raised position, the load is carried by
an upper edge 3114a' of the interconnecting wall 3114', which
engages against an opposite edge of the forward arcuate portion
4502e of the handle. Additionally or alternatively, when the handle
is in the fully raised position, the load may be carried by an
underside of the interconnecting wall 3114' which is in contact
with the upper surface of the body portion 4502f of the handle that
is shown as contacting the underside of the interconnecting wall
3114' in FIG. 116. The handle arrangement is configured to carry
the full apparatus load including a liquid chamber 300' containing
liquid. The handle may comprise honeycomb or rib feature(s) or
fibre reinforcement to strengthen and stiffen the handle. The
handle may be made from a suitable stiff and strong material. For
example, the material may be a plastic material such as
polycarbonate.
[0681] When the handle is in the fully raised position, the second
pivot protrusion 4502b'' is located at the upper rear end of the
second pivot cavity 4502c''. The handle is held in that position
due to the angle of the second pivot cavity 4502c''. When the
handle is in the fully raised position the second pivot protrusion
4502b'' will try to move upward and the top wall of the second
pivot cavity 4502c'' will interact with the chassis of the
apparatus. To move the handle to the lowered position, the handle
is moved horizontally and downwardly to release the handle from its
fully raised position.
[0682] That required movement is accentuated by the shape and
position of the region of decreased depth 4502ef''. Alternatively,
the region of decreased depth may not be provided. As another
alternative, the required movement could be accentuated by having
portion 4502ef'' raised further relative to an adjacent portion of
the second pivot cavity 4502c'', such that the upper wall and lower
wall of portion 4502ef'' are positioned higher than the respective
upper wall and lower wall of the adjacent portion of the second
pivot cavity. Such a configuration is shown in FIG. 114. Rather
than a step being provided, portion 4502ef' forms a ramp between
the rearward portion 4502ef'' and the adjacent portion of the
second pivot cavity 4502c''. Although the first pivot cavity 4502c'
is not shown in FIG. 114, it will be understood that the first
pivot cavity will be provided.
[0683] In the form shown, the first pivot protrusion 4502b' and
first pivot cavity 4502c' are located toward an outer portion of
the apparatus, and the second pivot protrusion 4502b'' and the
second pivot cavity 4502c'' are located toward a centre of the
apparatus. In an alternative configuration, the sides could be
reversed. By having the pivot protrusions and pivot cavities on
opposite sides of the handle, the handle mechanism is less likely
to bind during movement of the handle 4500, particularly at the
intersection between the first pivot cavity 4502c' and the second
pivot cavity 4502c'', adjacent the step 4502ef'. Alternatively, the
pivot protrusions 4502b', 4502b'' and the pivot cavities 4502c',
4502c'' could be provided on one side of the device (either towards
the centre or the outer side), with a more rounded edge provided at
the intersection between the first and second pivot cavities to
reduce the likelihood of binding.
[0684] A surface of the handle 4500 bears against a surface of the
handle retainer 4498 throughout movement of the handle from the
fully lowered position to the fully raised position, to support the
handle and prevent it from wobbling. For example, a left side face
of the body portion 4502f of the handle may bear against the left
side wall of the handle retainer throughout that movement.
Alternatively, a right side face of portions 4502e, 4502f of the
handle may bear against the right side wall of the handle retainer
throughout that movement. The surfaces that bear against each other
are load-bearing and remain load-bearing throughout the movement of
the handle.
[0685] The body portion 4502e and arcuate portion 4502f are wide to
deal with bending moments through the single sided handle. The
length of the base of the handle (between and extending beyond the
pivot protrusions 4502b', 4502b'') may be made as long as possible
to reduce wobbling of the handle.
[0686] As shown in FIG. 101, when the handle 4500 is in the fully
lowered position, the handle is flush with the upper portion of the
housing. That is, a substantially continuous surface is formed
around the upper sides, front, and rear of the upper chassis 3102'
of the housing, including the handle 4500.
[0687] When forward/downward force is applied to the handle 4500 to
lower it from the fully raised position, the force is applied via
the handle to the handle retainer 4498 rather than directly to the
upper or lower chassis. The force is not carried by the pivot
protrusions in the pivot cavities.
[0688] In some configurations, the main housing and/or handle 4500
may be provided with one or more magnets to retain the handle in
the fully lowered and/or fully raised positions For example, the
handle may comprises magnet(s) and the housing may comprise
magnet(s) or conductive component(s) that are attracted by the
magnets, or vice versa. FIG. 103 shows recesses 4506' in the
underside of the handle 4500 on or adjacent the cross-member 4506,
and FIG. 104 shows corresponding recesses 4506'' in the upper
chassis part 3102' of the housing. Each recess may comprise a
suitable magnet or conductive component. The apparatus may comprise
one or more sensors, such as Hall Effect sensor(s) to determine
whether the handle is in a lowered or raised position.
[0689] The magnets can provide a tactile and/or audible indication
of engagement of the handle in the fully raised and/or lowered
position. When using magnets, there is less likelihood of a liquid
supply tube to the chamber being compressed and stopping liquid
flow, as there may be with a mechanical latch (with which a liquid
supply tube could potentially be captured between the handle and
main housing and water flow cut off and/or the tube damaged).
Magnets also have the benefit of reduced wear compared to a
mechanical engagement feature.
[0690] The single-sided handle/lever 4500 enables tube(s) that
connect a liquid bag to the liquid chamber 300' to be fed through
the space between the right side member 4504 of the handle/lever
4500 and the main housing, when the handle/lever 4500 is in the
raised position.
[0691] Instead of the pivot cavities 4502c' 4502c'' being provided
between the upper chassis part of the housing and the handle
retainer 4498, the pivot cavities could instead be provided in the
upper chassis part 3102' or between the upper and lower chassis
parts 3102', 3202' of the housing, and the handle retainer 4498 not
used.
[0692] An upper portion of the main housing comprises a forwardly
angled surface 3124'. The surface 3124' is configured for receipt
of a display and user interface module 14. As shown in FIGS. 101,
102, and 104, the surface 3124' has elongate drainage channels
3124a', 3124a'' extending in a forward/rearward direction of the
apparatus. The channels are provided externally of respective
upstanding walls 3124b', 3124b''. The walls 3124b', 3124b'' are
connected at their rear ends by a rear transverse upstanding wall
arrangement 3124c and at their front ends by a front transverse
upstanding wall arrangement 3124d. The front transverse upstanding
wall arrangement 3124d has an arcuate shape corresponding to the
curvature of wall 3134'. The upstanding walls 3124b', 3124b'',
3124c, 3124d form a continuous wall and are configured to cause any
liquid that falls onto the top of the apparatus to drain toward the
base of the chamber bay 3108' and out of the base of the apparatus
through aperture(s), rather than into the regions of the apparatus
with gasflow paths or electrical or electronic components. Adhesive
may be provided between the display 14 and the surface 3124' to
minimise liquid ingress.
[0693] This configuration is also suitable for use with a liquid
chamber 300' that is filled from a flexible liquid bag, as
discussed in relation to the configuration of FIGS. 55 to 64.
[0694] The handle/lever 4500 may comprise one or more features,
such as apertures 502a, 504a as shown in FIG. 52 for example, for
guiding liquid tube(s) from above into the liquid chamber. The
tube(s) will be coupled to the liquid chamber. The liquid chamber
may comprise a float valve which controls flow of liquid from the
tube(s) into the liquid chamber.
[0695] The handle/lever 4500 will be provided with one or more
features to assist with insertion, retention, and/or removal of the
liquid chamber 300' in or from the chamber bay 3108'. Those
features may be any one or more of the features described in
relation to the configurations above.
[0696] By providing a handle/lever 4500 that assists with insertion
and/or retention and/or removal of the liquid chamber in and/or
from the chamber bay, a user can readily ensure that the liquid
chamber 300' is fully inserted in the chamber bay 3108' while still
being able to easily remove the liquid chamber from the chamber bay
when desired. This is particularly advantageous for users with
limited mobility. The handle/lever also avoids the use of a
separate fingerguard. The chamber bay may have detent(s) to assist
with insertion and/or retention of the liquid chamber in the
chamber bay, such as those described above in relation to other
configurations. Those details will enable a user to readily ensure
that the liquid chamber is fully inserted in the chamber bay. Full
or correct insertion and/or retention may be required to ensure
that a satisfactory seal is obtained and maintained between the
liquid chamber and other component(s) that form part of the gasflow
path. Because the handle/lever encloses a portion of the chamber
bay when the lever is in the closed or fully lowered position, when
the handle/lever is in the fully raised position, a large space is
created between the cross-member of the handle/lever and the
housing of the apparatus including a large opening at the front of
the chamber bay and around the liquid chamber, allowing easy
insertion and removal of the liquid chamber to and from the chamber
bay because a user's fingers can easily fit between housing walls
and the liquid chamber.
[0697] The handle/lever 4500 may be configured so that the liquid
chamber 300' can be inserted into the chamber bay 3108' when the
handle/lever is in the raised position. When the handle/lever 4500
is in the lowered position, the handle/lever will act as a chamber
guard to both prevent the removal of the liquid chamber 300' from
the chamber bay 3108', and to prevent a user from touching the
heater plate in the base of the liquid chamber.
[0698] Removal of the liquid chamber 300' from the chamber bay
3108' is a two-step procedure. First, the user lifts the handle
4500 to the fully raised position. Second, the user removes the
liquid chamber 300' from the chamber bay 3108'. Each of these steps
can be done with a single hand, and the force required to perform
each of the steps is low. This makes the apparatus particularly
suitable for home use by a user who is unwell.
[0699] FIGS. 118 and 119 show an alternative configuration
removable retention cover 4150a to retain a removable gasflow tube
or elbow 1342 in place in the apparatus. The apparatus has the
removable gasflow tube or elbow configuration of FIGS. 66 to 77,
but could have any other suitable configuration such as that of
FIGS. 25 to 33 for example.
[0700] Similar to the configuration of FIGS. 25 to 26b, with the
removable retention cover 4150a removed from the upper chassis
3102', the elbow 1342 can be removed from the elbow retainer 2160.
With the removable retention cover 4150a connected to the upper
chassis 3102', the elbow 1342 cannot be removed from the elbow
retainer 2160.
[0701] The retention cover 4150a has an upper ceiling portion 4151
with a curved configuration and two substantially vertical side
wall portions 4152. The ceiling portion 4151 comprises a recess
4153 for receipt of the patient outlet port of the removable elbow
1342.
[0702] The retention cover 4150a is configured such that it can
only be removed from the upper chassis 3102' of the housing by
moving it in a direction that is transverse to the removal and
insertion direction of the elbow 1342. To that end, each side wall
portion comprises at least one guide recess 4156a at a base
thereof. In the form shown, the two spaced apart guide recesses
4156a are provided at the base of each side wall portion 4152. The
guide recesses are shown as being square or rectangular, but could
be any suitable shape. The forwardly angled surface 3124' of the
upper chassis 3102' comprises complementary guide projections 3125a
that are sized and configured to engage with the guide recesses
4156a.
[0703] Each side wall portion of the removable retention cover
4150a also has a guide projection 4156b positioned between the
guide recesses 4156a. The forwardly angled surface 3124' of the
upper chassis 3102' comprises complementary guide recesses 3125b
that are sized and configured to engage with the guide projections
4156b. The guide projections 4156b of the removable retention cover
have enlarged portions or barbs 4156b' that engage under lips of
the guide recesses 3125b when the removable retention cover is
engaged with the housing of the device, to provide a positive
engagement of those components.
[0704] The configuration of guide recesses and guide projections is
such that the removable retention cover 4150a can only be engaged
and disengaged from the upper chassis 3102' by substantially
vertical movement of the removable retention cover relative to the
main chassis, which is transverse to the insertion and removal
direction of the removable elbow 1342 to and from the elbow
retainer 2160. Alternatively, the retention cover could be
configured to be engaged and disengaged from the upper chassis by
movement in a sideways direction, which is transverse to the
insertion and removal direction of the removable elbow to and from
the elbow retainer.
[0705] An upper portion of the gasflow inlet elbow 324 is provided
with an engagement feature 324a which engages with a complementary
engagement feature 4156c on the underside of the removable
retention cover 4150a, to assist with locating the removable
retention cover in position on the upper chassis. In the form
shown, the engagement feature 324a comprises a cross-shaped
projection and the engagement feature 4156c comprises a
complementary cross-shaped recess. However, any suitable shapes
could be used.
[0706] If the retention cover 4150a is in position on the upper
chassis 3102' and the elbow 1342 is in position in the elbow
retainer 2160, attempting to pull elbow 1342 forward will be
unsuccessful, because of engagement between the cover 4150 and the
upper chassis 3102'. The electrical connection between the
removable elbow 1342 and the elbow retainer 2160 and related
electrical receiver, will also provide some structural coupling
between the removable elbow and the housing.
[0707] A flexible tether (not shown) such as a silicon cord may
couple the retention cover 4150a to the housing to minimise the
likelihood of that being lost.
[0708] In an alternative configuration, the removable retention
cover may be arranged to slide on and off the upper chassis part in
substantially the same plane as the removable gasflow tube or elbow
1342 inserts into and removes from the elbow retainer 2160. FIGS.
120 and 121 show one alternative removable retention cover 4150b
with that configuration. The apparatus may have the removable elbow
1342 configuration of FIGS. 66 to 77, but could have any other
suitable configuration such as that of FIGS. 25 to 33 for
example.
[0709] The retention cover 4150b has an upper ceiling portion 4151
with a curved configuration and two substantially vertical side
wall portions 4152. The ceiling portion 4151 comprises a recess
4153 for receipt of the patient outlet port of the removable elbow
1342.
[0710] In this configuration, the upper chassis 3102' comprises
elongate guide recesses 3125a' in the form of channels that extend
substantially in a forward and rearward direction of the apparatus.
The side wall portions 4152 of the retention cover 4150b have
complementary projections 4152a in the form of elongate rails that
project outwardly from the side wall portions 4152, and that are
sized and configured to slidably engage with the guide recesses
3125a'. In another configuration, the recesses may be provided in
the side wall portions 4152 and the rails may be provided in the
upper chassis 3102'. Alternatively, the rails and recesses could be
provided elsewhere. For example, rails could be provided on the
base of the forwardly angled surface 3124', and recesses provided
on the side wall portions 4152, or vice versa. The handle/lever
4500 (not shown in FIGS. 120 and 121) tapers slightly so that the
retention cover 4150b can be inserted/removed when the handle/lever
4500 is in a raised position.
[0711] To insert the removable elbow 1342 and retention cover 4150b
into the housing, the elbow can be inserted through the aperture
4153 in the retention cover 4150b. The elbow 1342 and cover 4150b
can then be slid as one unit into the main housing, so that the
elbow 1342 is received in the elbow retainer 2160 and the retention
cover 4150b is engaged with the guide rails 3125a'. This provides
an easier assembly of the elbow and retention cover into the
housing with movement in a single degree of freedom.
[0712] As discussed above, the PCB connector 1366 of the elbow 1342
may be oriented at a suitable non-parallel and non-coaxial angle
relative to the longitudinal axis 1340A of the manifold gases inlet
port 1340 of the removable elbow. The guide rails 3125a' and the
PCB connector 1366 will be on substantially the same plane so that
the retention cover 4150b and elbow 1342 can be inserted together
in one movement. The guide rails 3125a' and the PCB connector may
act to guide the retention cover and elbow into successful
engagement.
[0713] The difference between the insertion angle of the elbow 1342
and retention cover 4150b into the housing, and the insertion angle
of the chamber 300' into the chamber bay 3108', means that removal
of the chamber 300' from the chamber bay 3108' will not cause the
elbow 1342 or retention cover 4150b to be removed from the upper
chassis.
[0714] The retention cover 4150b and/or removable elbow 1342 may
have one or more features to assist with retaining the removable
elbow 1342 in engagement with the retention cover. The feature(s)
may assist with aligning the retention cover 4150b and elbow 1342
with each other, so they are correctly aligned for insertion into
the apparatus. The feature(s) may, for example, comprises
protrusion(s) and/or recess(es), or an interference fit between the
retention cover 4150b and the elbow 1342.
[0715] The handle/lever 4500 may comprise feature(s) to prevent
removal of the removable retention cover 4150a, 4150b from the
apparatus housing, when the handle is in the fully lowered
position, but to enable the removal of the retention cover 4150a,
4150b from the apparatus housing when the handle is in the fully
raised position. Alternatively, in some configurations the
retention cover 4150a, 4150b can be inserted or removed from the
apparatus housing when the handle 4500 is in any position.
[0716] The removable retention covers 4150a, 4150b are shown as
being substantially open at their front ends. A rear end of either
retention covers 4150a, 4150b may be arranged to provide a
rearwardly-directed outcropping region that is spaced above a front
of the apparatus display. The open front end and/or outcropping
region may be used as additional handles to assist with carrying
the apparatus 3010'.
[0717] FIGS. 122 to 125 show an electrical connector 3276 that is
provided in a bottom rear corner of the lower chassis 3202' of the
main housing of the apparatus 3010'. The electrical connector 3276
is arranged to provide mains or battery power to the components of
the apparatus 3010', such as the electronics boards 272 and other
electrical components.
[0718] The electrical connector 3276 comprises a receiving socket
3276a that is arranged to receive the plug of a power cord 3277.
The receiving socket 3276a and other components of the electrical
connector are oriented in the main housing such that the power cord
can be inserted into the electrical connector 3276 in a plane that
is coplanar or parallel with the base of the apparatus; i.e. with a
horizontal movement.
[0719] The electrical connector 3276 comprises a retainer 3276b to
maintain the power cord 3277 in engagement with the socket 3276a.
As shown in FIG. 125, the retainer 3276b comprises a generally
U-shaped body to receive an underside of the plug of the power cord
3277. An entrance end 3276c of the retainer comprises at least one
upstand 3276c' that forms a protrusion to engage with a recess in
the plug of the power cord. In the form shown, the retainer
comprises a pair of upstands that are configured and sized to
receive a necked portion 3277a of the plug of the power cord. Once
the plug of the power cord 3277 is inserted into the socket 3276a
and the retainer 3276 is engaged with the plug, the protrusions
3276c' will prevent the removal of the plug of the power cord from
the socket, by engaging against a widened surface adjacent the
necked region 3277a of the power cord if the power cord is
pulled.
[0720] A fastener aperture 3276d is provided in the base of the
retainer 3276a, to enable the retainer to be attached to the lower
chassis part 3202' with a suitable fastener such as a screw.
[0721] A mounting foot 3276e extends from the bottom of the
retainer to minimise the likely hood of slippage on a supporting
surface.
[0722] The retainer 3276b comprises at least one projecting wing
3276f, and in the form shown has two projecting wings. The
projecting wings extend transversely to the insertion direction of
the plug of the power cord 3277 into the electrical connector 3276.
The wings 3276f interact with complementary recesses in the lower
chassis to prevent horizontal movement of the retainer 3276b.
[0723] To insert the power cord into the apparatus, the plug of the
power cord 3277 is inserted into the electrical connector 3276 in
horizontal insertion direction (direction 1 of FIG. 125). Once the
plug of the power cord is inserted into the socket 3276a, the
retainer 3276b is inserted vertically into the base of the lower
chassis part 3202' in insertion direction 2. The wings 3276f of the
retainer engage in the recesses in the lower chassis, and the
projections of the retainer engage with the necked portion 3277a of
the power cord, so that the power cord cannot be removed from the
electrical connector. A fastener is then used to fasten the
retainer to the lower chassis. The process needs to be reversed to
remove the power cord from the electrical connector.
[0724] The horizontal entry electrical connector makes it easier to
retain the power cord in the apparatus and to hide most of the
power plug when inserted. The horizontal entry also positions the
wires nearer to the mains inlet, and enables the electrical
connector to only take up a small space in the apparatus.
[0725] Rather than being on a horizontal orientation, the described
electrical connector 3276 features could be used on an angled
orientation that is non-horizontal and non-vertical relative to the
main housing of the apparatus. An angled orientation may reduce the
likelihood of liquid ingress, and may result in the power cord
projecting less from the apparatus which has benefits if the
apparatus is to be pole-mounted. The power cord may have an elbow
plug that is retained in position with retention features similar
to those described above.
[0726] In addition to the power cord retainer 3276b described
above, the apparatus 3010' may have the power harness guide 4276
shown in FIGS. 126 to 130. The power harness guide 4276 will
suitably be made from a plastic material, and is used to position
the wires or power harness that connect to the inside portion of
the receiving socket 3276a.
[0727] The power harness guide 4276 comprises an inverted generally
C-shaped base portion 4276a that defines a recess 4276a' that
receives the body of the receiving socket 3276a. The base portion
4276a has a pair of inwardly directed flanges 4276a'' that are
positioned beneath the receiving socket 3276a, when the receiving
socket 3276a is positioned in the base portion 4276a. A support arm
4276b extends from the base portion 4276a and has a generally
L-shaped cross-section. The support arm 4276b has a generally
linear portion 4276p' adjacent to the base portion, and a generally
arcuate portion 4276p'' distal the base portion. A plurality of
holders 4276b' are provided along the support arm 4276b to receive
and hold wires or cables. Although two holders are shown, any
suitable number of holders could be provided.
[0728] A passage 4276b'' is located in a portion of the support arm
4276b that is distal from the base portion 4276a, and enables wires
or cables to be routed out of the support arm 4276b and connected
to a portion of the apparatus to be powered, such as PCB 272. A
portion 4276tp of the arm adjacent the passage is tapered, to
provide a smooth surface for routing the wires or cables out of the
support arm.
[0729] A locator/coupler 4276d is located at an end of the support
arm 4276b opposite to the base portion, to locate and couple the
power harness guide 4276 to the PCB 272. The generally linear
portion 4276p' is oriented to be substantially parallel to a plane
of the PCB 272 in use.
[0730] The power harness guide 4276 couples wires or cables from
the receiving socket 3276a to the PCB 272, to control the position
of the wires or cables and allow ease of assembly of the apparatus,
as the PCB 272 assembly can be inserted into the main housing in
one movement.
[0731] FIGS. 129 and 130 show details of the lower chassis 3202' in
the region where the electrical connector 3276 is located. The
lower chassis 3202' defines an aperture 3800 through which the
power cord plug 3277 can be inserted into the receiving socket
3276a. An exterior base part is provided with a curved cavity 3802
to receive the power cord plug 3277. Transverse recesses 3804 are
provided on either side of the cavity 3802 to receive the
projecting wings 3276f of the retainer 3276b. The recesses have
threaded apertures to receive fasteners.
[0732] As shown in FIG. 130, the lower chassis is provided with an
upstand 3806 that has channels 3808 at either end thereof. The
upstand has a height slightly greater the height of the receiving
socket 3276a. The channels are complementary to a front flange
3276a' on the receiving socket 3276a, so the receiving socket 3276a
can be inserted into the upstand 3806 from above. A base rib 3810
is provided to engage behind the front flange of the receiving
socket 3276a, to prevent liquid getting underneath the receiving
socket 3276a. Recesses 3812 are provided on either side of the rib
3810, so that liquid will drip off the bottom of the front flange
3276a' rather than wicking under the flange into the main housing
of the apparatus. A channel 3814 is provided in the lower chassis
between the curved cavity 3802 and the aperture 3800, to prevent
liquid bridging across from the cavity 3802 to the receiving socket
3276a.
[0733] FIGS. 146 and 147 show an alternative retainer 3276b' for
use in the electrical connector 3276. Unless described below, the
features and functionality are as described above, and like
reference numerals indicate like parts. The shape of the retainer
3276b' has been modified to correspond with the external shape of
the housing of the lower chassis. The retainer 3286b' has two
fastener apertures 3276d; one on either side of the retainer. That
provides more symmetrical loading through the retainer; however, a
single aperture could alternatively be provided.
[0734] FIG. 145 shows an alternative configuration of the lower
chassis 3202'' in the region where the electrical connector 3276 is
located. Unless described below, the features and functionality are
as described above with reference to FIGS. 129 and 130, and like
reference numerals indicate like parts. The cavity 3802 is shaped
to receive the power cord plug and to receive the retainer 3276b'.
A drainage aperture 3809 is provided through the base of the lower
chassis 3202'', inward of the retainer 3276b'. The drainage
aperture is positioned beneath the power cord plug when the power
cord plug is inserted into the electrical connector. The drainage
aperture 3809 is configured to enable liquid to drain from the
lower chassis to an exterior of the housing, if any liquid enters
the lower chassis. The aperture causes a break in the wall to help
prevent water tracking from inside to outside the case, or vice
versa.
[0735] FIGS. 131 and 132 show details of a communication connector
arrangement 3274 in an upper portion of the rear wall of the lower
chassis 3202'. The connector arrangement 3274 is in electrical
communication with the electronics boards 272
[0736] In the form shown, the connector arrangement 3274 comprises
three USB ports. While three ports are shown, any suitable number
of ports could be used. The port(s) could be different types of
communication port(s).
[0737] The port(s) could be positioned at any suitable angle
relative to a vertical axis of the apparatus. The insertion angle
of a plug into the connector may be between 0 degrees and 90
degrees relative to the vertical axis. The angle may be
non-horizontal to reduce the likelihood of the inserted plugs being
bumped, and may be non-horizontal and non-vertical to reduce the
likelihood of liquid ingress; i.e. the port(s) may face at least
partly downwardly so that the insertion angle of plug(s) into the
connector(s) is at least partly upward. Another benefit of an
angled USB connection is that the PCB can be larger. In the
configuration shown, the plug inserts into the connector at an
angle that is perpendicular to the PCB and thus the PCB can better
use the space within the housing if the configuration is angled. In
one form, the port(s) may be at an angle of between about 5 degrees
and about 30 degrees relative to the vertical axis. In one form,
the port(s) may be at an angle of between about 10 degrees and
about 20 degrees relative to the vertical axis. In one form, the
angle is about 15 degrees relative to the vertical axis of the
apparatus, to allow the USB plug upon insertion into the ports, to
be at an angle of 90 degrees relative to the PCB 272. As shown in
FIG. 132, the lower chassis part may have a recess with a wall
3274d that is angled relative to vertical at the insertion angle of
the plug into the connector, to provide support for the plug once
inserted. A lip may be provided on each port to reduce the
likelihood of water ingress into the port(s).
[0738] As shown in FIG. 131, each connector of the connector
arrangement 3274 preferably has chamfered lead-in ribs 3274b
positioned above and below an entrance to the USB port 3274a, to
assist with the insertion of the USB plug 3274c into the port
3274a. The lead-in ribs 3274b may be positioned above and below,
and/or on either side of the USB port.
[0739] An upper outer horizontal edge 3274e of the recess of the
communication connector arrangement 3274 may comprise a sharp edge
or a liquid deflector, to minimise the likelihood of liquid seeping
into the connectors of the connector arrangement, by encouraging
liquid to drop off the sharp edge or liquid deflector rather than
running into the recess. For example, the sharp edge may be
provided by an inwardly directed wall portion that extends towards,
or below, the connectors and that intersects with the rear wall
portion 3222 of the lower chassis on a sharp angle, such as an
orthogonal angle for example. Alternatively, a liquid deflector may
be provided by extending the rear wall portion 3222 downwardly
beyond the connectors, or by providing a louvre or ramp that
overhangs the connectors to deflect liquid away from the
connectors.
[0740] As shown in FIG. 132, the apparatus 3010' may have a battery
3222a to provide power to the apparatus when there is a power
outage. The battery may be replaceable.
[0741] In the form shown, the battery is coupled to an exterior of
the back wall of the apparatus. This provides a large surface area
to cool the battery and reduces the amount of heat entering the
apparatus from the battery. Additionally, this configuration
reduces the influence of heat generated by components of the
apparatus on the battery, particularly when the battery is being
charged. In an alternative configuration, the battery may be
internally mounted in the main housing.
[0742] The back wall may comprise a recess and/or electrical
connector(s) to connect with the battery terminals, the electrical
connector(s) being in electrical communication with the PCBs 272. A
wall may be provided around the electrical connection to reduce
liquid ingress in that region.
[0743] As shown in FIGS. 133 and 134, the apparatus 3010' may have
a mount 3700 for mounting the apparatus to a stand or pole 3701.
This enables the apparatus to be used in an elevated position,
without taking up horizontal storage space on bedside tables.
[0744] The mount 3700 may be integrally formed with part of the
main housing of the apparatus. In the form shown, the mount 3700 is
integrally formed with the left side wall 3210' of the lower
chassis 3202' of the housing. The mount could instead be integrally
formed with any of other walls of the housing, such as a rear wall,
right side wall, or other wall.
[0745] The side of the apparatus comprises a recess 3702. A
downwardly projecting tongue 3704 has an upper end that is
integrally formed with the wall, and is positioned in the recess. A
free, lower end of the tongue 3704 is provided with a projecting
bump 3706. The bump projects outwardly a greater distance than the
remainder of the tongue.
[0746] When the apparatus is mounted to the stand using the mount
3700, the bump 3706 causes the apparatus to lean towards the stand
as shown schematically in FIG. 134. Without the bump, a user may
perceive the apparatus leaning away from the stand (due to the base
of the apparatus swinging in towards the stand) and be concerned
that the apparatus is not securely held. The bump 3706 therefore
positions the apparatus such that it leans inwardly towards the
stand so that a user is unlikely to be concerned regarding the
coupling between the stand and the apparatus.
[0747] The mounting 3700 will be sufficient that the apparatus
3010' is securely held with a reasonable buffer strength to hold
the apparatus through likely usage cases (e.g. a user leaning on
the apparatus, accidental bumping of the apparatus), whether or not
the bump is present. The bump addresses the visual look and user's
perception of the case.
[0748] The bump 3706 may be configured to cause the unit apparatus
to lean in towards the stand 3701 by any suitable angle. For
example, angle .theta..sub.1 may be approximately 1-15.degree., or
approximately 1-10.degree., or approximately 1-7.degree., or
approximately 1-5.degree., or approximately 1-2.degree.. Therefore
.theta..sub.2 is .gtoreq.0.degree..
[0749] The main housing of the apparatus may be formed from any
suitable material that will allow the mounting 3700 to be
integrally formed. For example, the case may be formed from
polycarbonate.
[0750] The integral mount 3700 has greater impact strength compared
to an additional, screwed in part. Strengthening of the mount 3700
may also be done by, for example, varying the wall thickness,
ribbing, or varying internal geometries.
[0751] The apparatus could be mounted to the pole or the stand by a
c-clamp 3707 such as that shown in FIGS. 102 to 104 and 117. The
c-clamp 3707 has an arcuate recess 3707a that is configured to
snap-fit onto a suitable pole or clamp 3701. A side of the c-clamp
comprises an engagement region 3707b having two inwardly-directed
flanges that are configured to receive the tongue 3704. The bump
3706 on the bottom of the tongue may engage with a bump 3707c at
the base of the engagement region 3707b. These features are shown
in FIGS. 102 and 104.
[0752] To mount the apparatus to the pole or stand 3701, the
c-clamp 3707 will be fixed to the pole or stand at a suitable
height, by inserting the pole or stand into the arcuate recess
3707a. The apparatus 3010' is then mounted to the c-clamp 3707 and
thereby the pole or stand 3701, by inserting the tongue 3704 into
the engagement region 3707b of the c-clamp until the bumps 3706,
3707c engage. The c-clamp 3707 may have two engagement regions
3707b, to enable two apparatuses 3010' to be supported by one
c-clamp. The apparatuses 3010' can be lifted vertically relative to
the c-clamps 3707 to disengage them from the c-clamps and the stand
or pole.
[0753] Alternatively, the integral mount 3707 could couple with any
complementary structure so that the apparatus 3010' can be mounted
to any suitable support, such as a wall, shelf, or pole for
example.
[0754] FIGS. 135 and 136 show electrical connection arrangements
3722 that can be used in the apparatus 3010'. Electrical
connections will occur between PCBs and components of the
apparatus.
[0755] To form each electrical connection, a PCB 3722a is provided.
A generally annular collar 3722b made of a suitable plastic
material is then over-moulded onto the PCB 3722a. As shown in FIG.
135, the PCB will be provided with suitable apertures(s) 3722c to
enable collar material to flow through the PCB during the
over-moulding process, to provide a strong connection between the
collar 3722b and the PCB 3722a.
[0756] The collar 3722b and PCB 3722a assembly is then over-moulded
onto part of the main housing, for example onto a wall or floor of
the main housing, to form a structural connection and seal between
the PCB 3722a and the main housing of the apparatus.
[0757] The collar can be formed from any suitable plastics
material. In one example, the collar is formed from polycarbonate.
The formed collar is substantially rigid, meaning that the PCB
3722a would need to be snapped out of the collar 3722b to be
removed from the housing, as opposed to a soft grommet that could
possibly be pushed through by a user. The collar will provide a
better seal than a soft grommet that could be torn or damaged.
[0758] The PCB 3722 could be plasma treated to help with bonding
between the over-moulded collar 3722b and the PCB 3722a. That may
also assist with sealing against oxygen leakage into the regions of
the housing that house electrical and/or electronics
components.
[0759] The exposed portion of the PCB 3722a will be coupled to
suitable electrical connector(s).
[0760] FIG. 136 shows two exemplary locations for the PCB and
collar assemblies 3722, 3722' in the lower chassis 3202' of the
apparatus. Alternative positions are possible.
[0761] FIGS. 148 to 150 show an alternative configuration gasflow
inlet elbow 1324 for delivering gases from the outlet port 1452 of
the motor and/or sensor module 1400 to the liquid chamber gases
inlet port 306 of the liquid chamber in the flow therapy
apparatuses. Unless described below, the gasflow inlet elbow 1324
has the features and functionality described above for elbow 324,
and like numerals indicate like parts, with 1000 added to each
numeral.
[0762] The inlet elbow 1324 comprises a first body component 1324'
and a second body component 1324''. The first and second body
components are injection moulded plastic components. The first body
component comprises a tube that forms the manifold gases outlet
port 1322 and a first interface portion 1324A.
[0763] The first interface portion 1324A is provided at a base of
the manifold gases outlet port 1322 and comprises a stepped
arrangement comprising upper and lower angled sections 1324A1,
1324A2 that are oriented on any suitable angle relative to a
longitudinal axis 1322A of the gasflow outlet port, such as between
30 and 60 degrees, or 45 degrees, for example. The first interface
portion also includes a section 1324A3 that extends forward from
the base of the upper angled section, a section 1324A4 that extends
upward from the top of the lower angled section, and an angled
transition section 1324A5 between the sections 1324A3, 1324A4.
[0764] The second body component 1324'' comprises a second
interface portion 1324A' at an upper end of a gasflow inlet port
1325. The second interface portion comprises a stepped arrangement,
comprising upper and lower angled sections 1324A1', 1324A2' that
are oriented on any suitable angle relative to a longitudinal axis
1322A of the gasflow outlet port, such as between 30 and 60
degrees, or 45 degrees for example. The second interface portion
also includes a section 1324A3' that extends forward from the base
of the upper angled section, a section 1324A4' that extends upward
from the top of the lower angled section, and an angled transition
section 1324A5' between the sections 1324A3', 1324A4'. The first
and second interface portions are complementary so that they can
mate together. A suitable soft seal, such as an O-ring seal, will
be provided between the first and second interface parts. The first
and second interface parts can be fastened together by clips or
suitable fasteners 1324F such as screws for example.
[0765] The first and second interface portions 1324A, 1324A'
comprise recesses 1324R to receive fasteners or locating
protrusions on the main housing of the apparatus, to prevent
rotation of the inlet elbow 1324 relative to the housing and/or to
prevent the elbow from being pulled out of the housing. The inlet
elbow 1324 may be configured to mount to the upper and/or lower
chassis of the housing. Alternatively, the inlet elbow 1324 may be
configured to mount to the forwardly angled surface 124, 124',
3124' and/or the display carrier of the apparatus.
[0766] A one-way valve 1326 is mounted in the interior of the elbow
1324, at or adjacent the interface between the manifold gases
outlet port 1322 tube and the gasflow inlet port 1325 tube. In the
form shown, the non-return valve 1326 comprises a plate that is
movably mounted in the elbow to enable gas to flow in a direction
from the inlet port 1325 to the outlet port 1322, but not in the
reverse direction. The non-return valve may be biased in to a
closed position in the absence of gasflow, or may be configured to
close under pressure if gas attempts to flow in a direction from
the outlet portion 1322 to the inlet port 1325. The valve is
configured to prevent liquid from flowing backwards through the
elbow and into the housing.
[0767] The outlet port 1322 is provided with a recess 1322R to
receive a T-seal or L-seal as described herein, and the inlet port
1325 is provided with a recess 1325R to receive a suitable soft
seal such as an O-ring.
[0768] The smoother exterior shape of the inlet elbow 1324 will
likely make it easier to clean than inlet elbow 324.
[0769] The apparatus of FIG. 101 advantageously has tongue and
groove arrangements between components of the apparatus to reduce
water and oxygen ingress into the unit. As shown in FIGS. 151 to
160, the apparatus advantageously has tongue and groove
arrangements between the top of the rear outer wall 3222' of the
lower chassis 3202' and the bottom of the rear outer wall 3122' of
the upper chassis 3102', between the top of the left side outer
wall 3210' of the lower chassis and the bottom of the left side
outer wall 3110' of the upper chassis, between the top of the right
side outer wall 3216' of the lower chassis and the bottom of the
right side outer wall 3116 of the upper chassis, and between the
top of the front lip 3242' of the lower chassis and the bottom of
the front lip 3142 of the upper chassis.
[0770] The tongue and groove arrangements provide a substantially
continuous liquid/gasflow-resistant coupling around the periphery
of the upper and lower chassis parts 3102', 3202'. In the form
shown, the lower chassis 3202' is provided with grooves 3210G,
3222G, 3216G, 3242G, and the upper chassis 3102' is provided with
complementary tongues 3110T, 3122T, 3116T, 3142T that are
configured to be at least partly received in the respective grooves
when the upper and lower chassis parts are assembled together. The
continuous coupling advantageously extends along the front, sides,
and at least most of the rear of the chassis parts, as shown,
including around any corners between those surfaces.
Advantageously, tongue and groove arrangements are also provided
around the communication coupling portion 3274, as will be
described below with reference to FIG. 160.
[0771] FIG. 156 shows details of the tongue and groove arrangement
between the top of the rear outer wall 3222' of the lower chassis
3202' and the bottom of the rear outer wall 3122' of the upper
chassis 3102'. The top of the rear outer wall 3222' is provided
with a groove 3222G, and the bottom of the rear outer wall 3122' is
provided with a tongue 3122T that is sized and configured to be
received in the groove. The bottom of the rear outer wall 3122' of
the upper chassis 3102' may also be provided with a groove 3222G'
to receive a tongue 3222aT of the battery to mount the battery to
the housing.
[0772] The tops of the side walls 3210', 3216' of the lower chassis
3202' are also provided with grooves 3210G, 3216G, and the bottoms
of the side walls 3110, 3116 of the upper chassis 3102' are
provided with tongues 3110T, 3116T that are sized and configured to
be received in the grooves.
[0773] As shown in FIG. 159, the top of the front lip 3242' of the
lower chassis is provided with a groove 3242G, and the bottom of
the front lip 3142' of the upper chassis is provided with a tongue
3142T that is sized and configured to be received in the groove
3242G.
[0774] A portion of the upper chassis 3102' in front of the floor
portion 3136 of the chamber bay (that defines a recess 3138 to
receive a heater arrangement), comprises a downwardly oriented
transversely extending groove 3136G, and a bottom wall 3230 of the
lower chassis 3202' comprises an upwardly extending tongue 3230T
that is sized and configured to be received in the groove
3136G.
[0775] The sides and rear of the heater arrangement receiving
region also comprise a tongue and groove arrangement. As shown in
FIGS. 151 to 154, the upper chassis 3102' comprises a downwardly
extending tongue 3136T that extends around the sides and rear of
the heater arrangement receiving region. The ends of the tongue
3136T meet with the ends of the groove 3136G. The lower chassis
3202' comprise an upwardly oriented groove 3230G that extends
around the sides and rear of the heater arrangement receiving
region. The ends of the groove 3230G meet the ends of the tongue
3230T. Therefore, there is a continuous tongue and groove
arrangement around substantially the entire perimeter of the
chamber bay.
[0776] FIG. 158 shows an alternative configuration of the tongue
and groove arrangement between the upper and lower chassis parts at
the rear of the heater arrangement receiving region. In this
configuration, the lower chassis part comprises an upwardly
extending tongue 3230T', and the upper chassis part comprises a
downwardly oriented groove 3134G in the base of wall 3134, with the
tongue 3230T' sized and configured to be received in the groove
3134G.
[0777] In one configuration, the upper and lower chassis parts may
have a downwardly projecting tongue and upwardly projecting groove
in a rear portion of the housing, and the configuration may be
reversed at a front portion of the housing; e.g. from approximately
the region where the handle mechanism joins with the upper chassis
in FIG. 117.
[0778] FIGS. 151, 152, and 160 show details of the tongue and
groove arrangements between the communication coupling portion 3274
and the upper and lower chassis parts. The bottom of the rear outer
wall part 3122 of the upper chassis is provided with a downwardly
extending tongue 3122T, and the top of an outer wall of the
communication coupling portion 3274 comprises an upwardly oriented
groove 3274G that is sized and configured to receive the tongue
3122T. The top of the rear outer wall part 3222 of the lower
chassis is provided with an upwardly extending tongue 3222T, and
the bottom of an outer wall of the communication coupling portion
3274 comprises a downwardly oriented groove 3274G' that is sized
and configured to receive the tongue 3222T. Two surfaces (e.g. T2B
and G2B) are configured to meet so as to seal the upper and lower
chassis together. Alternatively, or in addition to this, other
surfaces may be configured to meet. An inner wall of the groove
3274G' is advantageously shorter than an outer wall of the groove,
to enable the communication coupling portion to be snap fit into
place on the lower chassis. The tongue and groove arrangement
preferably extends around the entire periphery of the
communications coupling portion 3274. For example, the lower
chassis part may comprise a tongue 3222T that is sized and
configured to be received in a groove 3274G' that extends along the
base and up the sides of the communications coupling portion
3274.
[0779] As shown in FIG. 157, a tongue and groove arrangement is
also provided between the outer extension tube or conduit 3133 of
the upper chassis 3102' and the gasflow passage tube 3264 of the
lower chassis 3202'. An outer wall portion of the gasflow passage
tube 3264 comprises an upwardly oriented annular groove 3264G that
is spaced from the upper end of the gasflow passage tube 3264, and
is positioned close to the ceiling 3262 of the motor and/or sensor
sub-assembly recess 3250. A bottom edge of the extension tube 3133
of the upper chassis comprises a downwardly extending annular
tongue 3133T that is sized and configured to be received in the
groove 3264G. It can be seen from FIG. 157 that the gasflow passage
tube 3264 extends up through the extension tube 3133 at least to
the upper edge of the extension tube, and in the form shown beyond
the upper edge of the extension tube and beyond the angled surface
3124'.
[0780] Because the gasflow passage tube 3264 extends up through the
extension tube 3133 and around the outside of the inlet elbow 324,
1324, and is formed as a single continuous unbroken integral part
including the walls 3256 and ceiling 3262 that define the recess
3250, in the case of a leak the gas will follow the path of least
resistance, which is to gather outside the leak region and exit to
atmosphere via the outside of the inlet elbow 324, 1324. It is very
unlikely that gases will flow into the housing and via a tortuous
path to the electronics of the apparatus
[0781] A tongue and groove arrangement is also provided between the
upper edge of a filter housing 3354 in the lower chassis 3202' and
a corresponding aperture 3354A in the upper chassis 3102'. The
tongue and groove arrangement may extend around the entire
periphery of the filter housing 3354 and aperture 3354A, to prevent
gas from leaking from the interior of the filter housing to the
exterior of the filter housing and into the main housing of the
apparatus. One of the filter housing 3354 and wall around aperture
3354A will have a groove, with the other of the filter housing and
wall around the aperture having a tongue that is sized and
configured to be received in the groove.
[0782] Any one or more of the tongue and groove arrangements may
have the configuration shown in FIG. 161, where the groove G1 has a
base G1B and substantially parallel side walls G1SW, and the tongue
T1 has a tip or edge T1E and substantially parallel side walls
T1SW. Alternatively, or additionally, any one or more of the tongue
and groove arrangements may have the configuration shown in FIG.
162 where the groove G2 has a base G2B, a first side wall G2SW1
that extends orthogonally from the base, and a second side wall
G2SW2 that initially extends orthogonally from the base and then
terminates at a chamfer G2C or angled surface. The chamfer helps to
trap any liquid particles between G2C/G2SW1 and T2SW.
Alternatively, the angled surface or chamfer G2C may extend all the
way to the base G2B. The angled surface or chamfer G2C is
configured to, along with the respective side wall of the tooth
T2SW, minimise or prevent wicking of liquid past the angled surface
or chamfer. The groove G2 will typically be oriented such that the
chamfered surface G2C is positioned on the side of the groove
corresponding to the part of the apparatus which liquid should be
kept away from. For example, the grooves 3210G, 3216G on at least
the side walls 3210', 3216' of the lower chassis 3202' may have the
chamfered surface G2C on their inner edges, to prevent liquid from
wicking into the interior of the side walls. The non-chamfered
outer side wall G2SW1 of the grooves will allow any moisture that
enters the tongue and groove to wick in an outwards direction
toward the exterior of the apparatus.
[0783] Alternatively, or additionally, an enlarged space may be
provided between at least one surface of the tongue T1, T2 and
respective surface(s) of the groove G1, G2 to reduce or prevent
wicking.
[0784] The tongues T1, T2 and grooves G1, G2 may have the
orientations shown in FIGS. 161 and 162.
[0785] The described and shown configurations and orientations are
examples only, and any suitable combination of the tongue and
groove arrangements and/or orientations of the tongue and groove
arrangements may be used in the apparatus.
[0786] The main housing of the apparatus comprises a small number
of parts. The upper chassis 3102' including forwardly angled
surface 3124' and the curved wall portion 3134 that surrounds the
majority of the chamber bay is integrally formed as a single part
(by injection moulding for example), which seals the chamber bay
from the interior of the upper chassis part behind the wall portion
3134, and reduces the likelihood of liquid/gases ingress into the
region behind wall portion 3134 from the chamber bay. Similarly,
the lower chassis 3202' including the walls and ceiling that define
the recess 3250 for receipt of the motor and/or sensor module and
the gasflow passage tube 3264 is integrally formed as a continuous
unbroken single part (by injection moulding for example), which
seals the interior of the recess 3250 from the upper region of the
lower chassis, and reduces the likelihood of gases ingress into the
upper region of the lower chassis from the recess 3250 and into the
part of the main housing formed between the upper and lower
chassis.
[0787] In the form shown, the upper and lower chassis 3102', 3202'
can be fastened together using a small number of fasteners. The
fasteners could be screws, or any other suitable fasteners. The
fasteners simply act to couple the upper and lower chassis parts
together. The nature of the tongue and groove seals between the
upper and lower chassis parts is such that the fasteners to not
need to provide continuous compression between the upper and lower
chassis parts to provide adequate sealing, which would be required
if soft seals were used. In an alternative configuration, the upper
and lower chassis parts could be coupled together using clips or
some other suitable arrangement.
[0788] FIGS. 163 and 164 show a modified battery 3222a that is
coupled to an exterior of the back wall of the apparatus, as
discussed above with reference to FIG. 156. The battery provides
functionality to the apparatus by powering the apparatus. The
battery shown in FIGS. 163 and 164 is larger than that shown in
FIG. 132, and has a higher capacity. Additionally, this battery
3222a differs in that the battery has a retention feature at the
base of the battery that is configured to overlap with part of the
motor and/or sensor module 400, 1400 to maintain the motor and/or
sensor module 400, 1400 in position in the recess 3250 in the
housing.
[0789] In the form shown, the retention feature of the battery
comprises a base flange 3222a' that extends under, and contacts,
part of the bottom wall 3230 of the lower chassis 3202'. The base
flange 3222a' is sized and configured to also extend under, and
contact, part of the base 1403 of the motor and/or sensor module
1400. When the motor and/or sensor module 1400 is positioned in the
recess 3250 and the battery 3222a is secured to the housing of the
apparatus, the motor and/or sensor module cannot be removed from
the recess due to the overlap between the base flange 3222a' and
the motor and/or sensor module.
[0790] To assemble the battery 3222a to the housing, the motor
and/or sensor module 1400 is inserted in the recess 3250. A
fastener can be inserted through aperture 1403E in the tab on the
base 1403 of the motor and/or sensor module, to fasten the module
to the lower chassis 3202'. The upper end of the battery 3222a is
coupled to the lower chassis part by inserting the tongue 3222aT
into the groove 3222G' as described above with reference to FIG.
156. The lower part of the battery can then be tilted forward so
that the base flange 3222a' contacts and overlaps with the base
1403 of the motor and/or sensor module. Fasteners are then inserted
through the apertures 3222a'' in the base flange to fasten the base
flange 3222a' to the lower chassis 3202'. The process can be
reversed to remove the battery 3222a and motor and/or sensor module
1400 from the housing.
[0791] Rather than being a base flange 3222a' that extends the
entire width of the battery 3222a, the retention feature could have
any other suitable form. For example, the battery may have a single
shorter flange, a plurality of shorter flanges, or one or more
other projections that can overlap with the base 1403 of the motor
and/or sensor module 1400 to retain the motor and/or sensor module
in position in the recess 3250 in the housing. Such retention
feature(s) could be incorporated in a smaller battery such as that
shown in FIG. 132 for example. As another alternative, the base
flange 3222a' or other retention feature(s) could be provided in a
different removable component that provides functionality to the
apparatus, with the retention feature(s) of that removable
functional component overlapping and contacting part of the motor
and/or sensor module 1400 to retain that in position in the recess
3250 of the housing when the removable component is secured to the
housing. It will be appreciated that the battery or other
functional component does not solely act to fasten the module 1400
to the housing, but additionally provides other functionality to
the apparatus.
[0792] The communications connector arrangement 3274 shown in these
figures differs from that of FIGS. 131 and 132 in that it comprises
only two USB ports due to the increased size of the battery.
However, while two ports are shown, any suitable number of ports
could be used. The port(s) could be different types of
communication port(s).
[0793] FIGS. 165 and 166 show an alternative removable elbow 3342
for use in the flow therapy apparatuses, the elbow having the PCB
connector 3366 shown in FIGS. 167 and 168. Unless described below,
the elbow will have the same features and functionality as the
removable elbow of FIG. 74, and the PCB connector will have the
same features and functionality as FIG. 75. Like reference numerals
indicate like parts, with 1000 added to each numeral.
[0794] Compared to the PCB connector 2366 of FIG. 75, the PCB
connector 3366 of FIGS. 167 and 168 has shortened electrically
conductive connector portions or pins 3366c. A pair of opposed
recesses 3366h are provided in the sides of the PCB connector 3366,
adjacent the inner ends of the connector portions 3366c. In the
form shown, the recesses 3366h are triangular cut-outs, but they
could have any suitable shape.
[0795] The plastic support portion 3374 of the elbow has angled
edges 3374a to allow for the recesses 3366h on the PCB connector
3366.
[0796] The base at the inner end of the horizontal limb
(corresponding to the manifold gases inlet port 3340) of the
removable elbow has an upwardly curved region 3340c prior to the
bend in the elbow to assist with tooling.
[0797] The PCB electrical connector may be modified so that the
thermistors 3366d or other temperature sensors are less affected by
the patient breathing conduit heater wire, the electrically
conductive tracks 3366b and the plastic board 3366a, and ambient
temperature. This reduces temperature sensor wall effects or stem
effects, to enable the temperature sensors to more accurately
measure gas temperature.
[0798] For example, as shown in FIG. 170, the cross-section and
length of at least one of the electrically conductive tracks 3366b'
that connect the thermistors 3366d' or other temperature sensors to
the connector portions 3366c', may have a reduced cross-section
and/or increased length compared to that shown in FIG. 169. For
example, one or more of the tracks 3366b' may have a tortuous path
along at least part of its length from the respective connector
portion 3366c' to the respective thermistor 3366d'. The track(s)
may have a sinuous configuration, a stepped or castellated
configuration as shown in FIG. 169, or any other suitable
configuration to provide additional length of the track.
[0799] As another example, as shown in FIG. 171, the shape of part
of the plastic board 3366a'' may be made convoluted. The convoluted
configuration may be provided by one or more apertures 3366g'' in
the board. In the form shown, the board has two apertures 3366g'';
a large aperture close to the interface between the two limbs of
the elbow, and a smaller aperture close to the connector portions
3366c'' of the PCB. That configuration could be varied. This
enables the thermal resistance at the join between the plastic
overmould and the plastic board 3366a'' to be exploited, to help
prevent the patient conduit heater wire from affecting thermistor
measurements and reduce stem effects.
[0800] As another example, as shown in FIG. 172, at least one of
the electrically conductive tracks 3366b''' may be provide with one
or more enlarged conductive portions 3366be''' having a relatively
large area and located near to the thermistors 3366d''' or other
temperature sensors. The enlarged conductive portion 3366be''' may
be provided by a widened portion of the track, a separate piece of
conductive material that is coupled to the track, or any suitable
configuration. In the form shown, the PCB electrical connector 3366
has one enlarged conductive portion that is substantially
rectangular or square, but any suitable number and/or shape of
conductive portions may be provided. The enlarged conductive
portion(s) 3366be''' increase heat transfer from the overmoulded
plastic to the board 3366a''' in the region of the thermistors to
reduce stem effects.
[0801] The features described and shown with reference to FIGS.
170-172 may be used alone or in any suitable combination.
[0802] FIG. 173 shows a carrier 3102 for the display and user
interface module in the flow therapy apparatuses. Unless described
below, the features and functionality are the same as for the
carrier 2102 of FIGS. 76 and 77, and like reference numerals
indicate like parts with 1000 added to each numeral. The carrier
3102 is configured for use with the removable retention cover 5150a
of FIG. 175. Unless described below, the features and functionality
of the removable retention cover are the same as for the cover
4150a of FIGS. 118 and 119, and like reference numerals indicate
like parts with 1000 added to each numeral.
[0803] Each side wall 5152 of the removable retention cover 5150a
has a guide recess 5156a that is defined by upward/downward
oriented guide projections 5156b at either end of the recess. Each
side of the carrier 3102 has a projecting ridge 3102p that is sized
and configured to fit in the recess 5156a of the cover. Either end
of the projecting ridge 3102p terminates at a guide recess 3102r
that is sized and configured to receive a respective one of the
cover guide projections 5156b.
[0804] Each side wall 5152 of the removable retention cover 5150a
has at least one downwardly oriented tongue with an enlarged
portion or barb 5156b' that engages under the respective projecting
ridge 3102p of the carrier 3102 when the removable retention cover
is engaged with the carrier 3102, to provide a positive engagement
of those components. Slots are provided on either side of each
tongue to enable the tongues to flex for the barbs 5156b' to pass
the projecting ridges 3102p of the carrier when the removable
retention cover is being engaged with, or removed from, the carrier
3102. While two tongues are shown on either side wall of the cover
5150a, the cover could alternatively have one or more than two
tongues.
[0805] In an alternative configuration, the carrier 3102 could have
the tongue(s) and barb(s), and the cover 5150a could have the
ridges. In another alternative configuration, the removable elbow
and/or retention cover 5150a may have positive engagement
feature(s) to provide additional restraint to the cover.
[0806] The carrier 3102 comprises a plurality of first apertures
3102A1 to enable mounting of the display and user interface module
14 to the carrier 3102 through the use of fasteners such as screws
or the like. The carrier 3102 has a plurality of second apertures
3102A2 to enable mounting of the carrier 3102 to the upper chassis
3102' through the use of fasteners such as screws or the like.
[0807] The removable retention cover 5150a is coupled to the
carrier 3102, and thereby to the main housing, by a flexible tether
6000 shown in FIG. 176. The tether comprises an elongate body 6002,
an aperture 6004 at or toward a first end of the tether, and
enlarged head 6006 at or toward an opposite second end of the
tether. The tether 6000 is coupled to the removable retention cover
5150a by inserting the enlarged head 6006 through a slot (not
shown) in the removable retention cover. The enlarged head inhibits
removal of the tether from the removable retention cover. The
tether 6000 is coupled to the carrier 3102 by inserting the first
end of the tether between the carrier 3102 and the upper chassis
3102' so its aperture 6004 is aligned with the respective aperture
3102A2, and is maintained in position by the fastener that is used
to fasten the carrier 3102 to the upper chassis 3102'. The tether
may be manufactured from a suitable resilient and robust material,
such as TPU for example.
[0808] FIGS. 177 to 183 show an alternative configuration removable
motor and/or sensor module or sub-assembly 2400 that can be used as
a flow generator in the flow therapy apparatuses. Unless described
below, the sub-assembly has the features and functionality
described in relation to the sub-assembly of FIGS. 78 to 95, and
like reference numerals indicate like parts, with 1000 added to
each reference numeral. The sub-assembly contains only minor
modifications from the sub-assembly of FIGS. 78 to 95.
[0809] Referring to FIG. 177, the base 2403 of the motor and/or
sensor module comprises a first recess or cut-out 2403R1 at an end
of the base 2403 for receipt of the base flange 3222a' of the
battery 3222a shown in FIG. 164. The flange 3222a' extends into the
recess 2403R1 to hold the motor and/or sensor module in position in
the lower chassis 3202' of the apparatus. A second recess or
cut-out 2403R2 is provided in a side of the base 2403 to enable a
flange of another removable component to be used to hold the motor
and/or sensor module in position in the lower chassis 3202' of the
apparatus, when the other removable component is secured to the
lower chassis. The protrusion that is shown between the recesses
2403R1, 2403R2 may not be present.
[0810] Rather than having the component 1407 with an aperture
1427A, the base 2403 has upstanding post 2407.
[0811] Referring to FIG. 178, the base 2403 is provided with a
plurality of mechanical stops 2403S in the region 2403A for receipt
of the motor/blower unit 2402. The mechanical stops 2403S are
angularly spaced around the region and are arranged to prevent the
motor/blower unit 2402 from coming off its mounts. In the form
shown, the mechanical stops comprise upstands. However, they could
be any suitable form. The upstands are sized so that they sit clear
of the motor/blower case to allow a small amount of movement of the
case. For example, the upstands may be sized to sit about 3 mm
clear of the blower case.
[0812] The base may have three or more mechanical stops, and in the
form shown six mechanical stops are provided. The mechanical stops
may be provided anywhere in the radial region represented by arrow
2403R; however, the further outward they are positioned and the
more stops there are, the less rocking the motor/blower unit is
able to do. The underside of the layer 2420 may also comprise
mechanical stops 2420S as shown in FIG. 180, to act against the top
of the motor/blower unit.
[0813] The protrusions 2411P are longer than those shown in the
configuration of FIGS. 78 to 95 to hold the motor/blower mounts
more securely in case the apparatus is dropped or knocked.
[0814] Referring to FIG. 179, an electrical connector 2456EC is
connected to the sensing printed circuit board 2456, to
electrically couple the sensing PCB to other electrical
component(s). Referring to FIG. 182, the cover layer 2440 is
provided with apertures 2440A1, 2440A2. Apertures 2440A1, 2440A2
facilitate clearance between electronic or sensing components and
the flow module.
[0815] The apparatuses described herein will advantageously have
removable and replaceable components, including: an oxygen valve
assembly, the motor and/or sensor module, a filter, the screen
carrier module that includes the display and interface PCBs, the
removable gasflow tube or elbow, the retainer cover, power cord and
retainer part, and PCBs. T-seals on the removable gasflow tube or
elbow and/or the inlet gasflow tube and/or elbow may be removable.
Alternatively, the seals may be fixed to the tubes and/or elbows,
with those components being removable/replaceable as one item. The
upper and lower chassis parts and other housing parts may also be
replaceable.
[0816] T-seals or L-seals may be used on the removable gasflow tube
or elbow and on the inlet gasflow tube or elbow, of the apparatuses
described herein, to couple with the fluid chamber. T-seals or
L-seals provide a decreased insertion force to insert the liquid
chamber compared to O-rings or soft couplers. The reaction force of
a T-seal or L-seal is determined by the width of its rib. A softer
material reduces the force. The liquid chamber will seal against
the bent limb of the T-seal or L-seal. Use of a T-seal or L-seal
makes the chamber slightly harder to remove than insert, but this
is easier to remove than if an O-ring or a soft coupler was
used.
[0817] The T-seals 2342T, 2342T' of FIG. 137 to 141 or the L-seals
2342T'' of FIGS. 142 and 143 can be provided in an alternative
apparatus to that described above. FIGS. 184 to 186 show a patient
breathing conduit arrangement 7000 that incorporates such a T-seal
2342T. The patient breathing conduit arrangement 7000 comprises a
patient breathing conduit 7002. A helical recess 7004 along the
periphery of the patient breathing conduit 7002 has a heater wire
to heat gasflow that is passing through the breathing conduit. One
end of the patient breathing conduit 7002 is coupled to a connector
7006. The connector 7006 is arranged to be coupled to a patient
interface such as a nasal cannula with a manifold and nasal prongs,
and/or a face mask, and/or a nasal pillows mask, and/or a nasal
mask, and/or a tracheostomy interface, for example.
[0818] The opposite end of the patient breathing conduit 7002 is
coupled to a connector 7010 for coupling to another apparatus, such
as a gasflow output port of a flow therapy apparatus, or the outlet
of a humidification apparatus, for example. The connector 7010
comprises an outer housing part 7012 and an inner part 7014 that is
at least partly received in the outer housing part.
[0819] The inner part is shown in detail in FIG. 185 and comprises
a tapered tube 7016 that is received in the end of the patient
breathing conduit 7002 to deliver gas to the patient breathing
conduit. An outer surface towards the outer end of the tapered tube
7016 comprises a recess 7018 for receipt of the T-seal 2342T or
L-seal. Alternatively, the T-seal or L-seal may be overmoulded onto
the tapered tube 7016. The inner part also comprises an electrical
connector 7020 to provide power to the heater wire and/or enable
communication between the patient interface and apparatus to which
the patient breathing conduit arrangement will be connected.
[0820] The connector 7010 of the patient breathing conduit
arrangement 7000 can be connected to another apparatus such as a
flow therapy apparatus, or the outlet of a humidification
apparatus, by inserting the outer part of the tube 7016 into a
gasflow outlet port of the flow therapy apparatus, or the outlet of
a humidification apparatus.
[0821] The inner tube 7016 forms a pneumatic connection with the
outlet of a flow therapy apparatus or humidification apparatus. The
inner tube 7016 may be inserted into the outlet or may engage
around the outlet of a flow therapy apparatus or humidification
apparatus to form a pneumatic pathway. The electrical connector
7020 connects with a corresponding electrical connector positioned
on or adjacent or around the outlet of the flow therapy apparatus
or humidification apparatus. In one example the connector 7010
connects to the outlet of a humidification chamber that is part of
the flow therapy apparatus or humidification apparatus.
[0822] The T-seal 2342T or L-seal with seal against the interior of
the gasflow outlet port, and the electrical connector 7020 will
connect to a complementary electrical connector on the apparatus.
The T-seal 2342T or L-seal may have the parameters, dimensions,
and/or modifications described above with reference to FIGS. 137 to
144. The T-seal or L-seal provide an improved seal over an O-ring
type element. Further the T-seal or L-seal also provide a reduced
force to engage the connector on to the outlet of the
humidification apparatus since the T-seal or L-seal flexes/bends
more easily along an axis. The T-seal or L-seal deflects in
response to a force applied to it from a user connecting the
connector onto the outlet of a flow therapy apparatus or
humidification apparatus, as compared to compressing along all
faces, making fitting the connector to the outlet easier for a
user
[0823] Although the present disclosure has been described in terms
of certain embodiments, other embodiments apparent to those of
ordinary skill in the art also are within the scope of this
disclosure. Thus, various changes and modifications may be made
without departing from the spirit and scope of the disclosure. For
instance, various components may be repositioned as desired.
Features from any of the described embodiments may be combined with
each other and/or an apparatus may comprise one, more, or all of
the features of the above described embodiments. Moreover, not all
of the features, aspects and advantages are necessarily required to
practice the present disclosure. Accordingly, the scope of the
present disclosure is intended to be defined only by the claims
that follow.
[0824] The various configurations described are exemplary
configurations only. For example, while the motor and/or sensor
sub-assembly recess is described as being in the underside of the
main housing, it could alternatively be in a rear, side, front, or
top of the housing. With such a variant, the air and/or oxygen
inlets may also be positioned differently as required.
[0825] As another example, rather than the liquid chamber and
chamber bay being configured so that the liquid chamber is inserted
into and removed from the chamber bay from a front of the housing,
the configuration could be such that the liquid chamber is inserted
into and removed from the chamber bay from a side, rear, or top of
the housing.
[0826] The features are described with reference to a flow therapy
apparatus that is capable of delivering heated and humidified gases
to a patient or user. The apparatus may be suitable for treating
chronic obstructive pulmonary disease (COPD). The apparatus may be
configured to deliver gases to a patient interface at a high flow
rate (high flow therapy).
[0827] Alternatively, one, some, or all of the features may be
provided in an apparatus for a different purpose. The apparatus may
be a high flow therapy apparatus, or may be a low flow therapy
apparatus. For example, the features may be provided in an
apparatus for providing continuous positive airway pressure (CPAP),
which may deliver gases (humidified or otherwise) at lower flow
rates.
[0828] One or some of the features may alternatively be provided in
an apparatus that does not require a humidifier and therefore does
not require the liquid chamber 300 or chamber bay 108 features. For
example, it will be appreciated that the configuration that
isolates the motor and gas flow path from the electrical and
electronic components has broad applications in other types of gas
delivery apparatuses.
[0829] The `flow therapy apparatus` language is intended to cover
all such variants.
[0830] Reference to any prior art in this specification is not, and
should not be taken as, an acknowledgement or any form of
suggestion that that prior art forms part of the common general
knowledge in the field of endeavour in any country in the
world.
[0831] Where reference is used herein to directional terms such as
"up", "down", "forward", "rearward", "horizontal", "vertical" etc,
those terms refer to when the apparatus is in a typical in-use
position, and are used to show and/or describe relative directions
or orientations.
* * * * *