U.S. patent application number 17/126886 was filed with the patent office on 2021-04-22 for multi-orientation canister for use with a reduced pressure treatment system.
The applicant listed for this patent is KCI Licensing, Inc.. Invention is credited to Fernando T. CHEN, Kevin H. DAI, Stephen C. YEADON.
Application Number | 20210113745 17/126886 |
Document ID | / |
Family ID | 1000005290200 |
Filed Date | 2021-04-22 |
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United States Patent
Application |
20210113745 |
Kind Code |
A1 |
CHEN; Fernando T. ; et
al. |
April 22, 2021 |
Multi-Orientation Canister For Use With A Reduced Pressure
Treatment System
Abstract
Systems and methods for reduced pressure tissue treatments,
including a multi-orientation canister. The canister includes an
inlet for receiving fluids from a tissue site, and a main chamber
in fluid communication with the inlet for receiving fluids from the
inlet. The canister includes a filter chamber separated from the
main chamber by one or more filter chamber walls. The one or more
filter chamber walls includes a primary hole having a first
diameter and a secondary hole having a second diameter smaller than
the first diameter. The primary hole provides a first path of fluid
communication between the filter chamber and the main chamber. The
canister includes an outlet for providing fluid communication
between the filter chamber and a reduced pressure source.
Inventors: |
CHEN; Fernando T.; (San
Antonio, TX) ; DAI; Kevin H.; (San Antonio, TX)
; YEADON; Stephen C.; (San Antonio, TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KCI Licensing, Inc. |
San Antonio |
TX |
US |
|
|
Family ID: |
1000005290200 |
Appl. No.: |
17/126886 |
Filed: |
December 18, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15971873 |
May 4, 2018 |
10898621 |
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17126886 |
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14271991 |
May 7, 2014 |
9987401 |
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15971873 |
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13401433 |
Feb 21, 2012 |
8758315 |
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14271991 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61M 2205/75 20130101;
A61M 1/0096 20140204; A61M 2205/21 20130101; A61M 1/0088 20130101;
A61M 1/0001 20130101 |
International
Class: |
A61M 1/00 20060101
A61M001/00 |
Claims
1. A liquid-collection canister comprising: a first chamber and a
second chamber fluidly isolated by one or more walls; and a
plurality of apertures positioned in the one or more walls to
provide fluid communication between the first chamber and the
second chamber, wherein one aperture of the plurality of apertures
is positioned in a plane perpendicular to another of the plurality
of apertures.
2. The liquid-collection canister of claim 1, wherein one of the
plurality of apertures is located at a centroid of the
liquid-collection canister.
3. The liquid-collection canister of claim 1, wherein at least one
of the apertures is vertical relative to a force of gravity in a
primary operating orientation of the liquid-collection
canister.
4. The liquid-collection canister of claim 1, wherein one of the
plurality of apertures has a first diameter and another of the
plurality of apertures has a second diameter smaller than the first
diameter.
5. The liquid-collection canister of claim 1, further comprising a
filter positioned within the second chamber and isolated from the
first chamber by the one or more walls.
6. The liquid-collection canister of claim 1, further comprising a
baffle positioned to inhibit splashing of fluids as the fluids
enter the liquid-collection canister.
7. The liquid-collection canister of claim 1, further comprising a
gelling agent positioned within the first chamber for creating a
gel upon contact with fluids received from the tissue site.
8. The liquid-collection canister of claim 1, wherein at least one
of the plurality of apertures is positioned beneath another of the
plurality of apertures in the liquid-collection canister's primary
operating orientation.
9. The liquid-collection canister of claim 1, wherein at least one
of the plurality of apertures is horizontal to a force of gravity
when the liquid-collection canister is in the primary operating
orientation.
10. The liquid-collection canister of claim 1, wherein at least one
of the plurality of apertures is configured to provide less
restrictive fluid communication between the first chamber and the
second chamber than fluid communication through another of the
plurality of apertures.
11. A liquid-collection canister comprising: a first and second
chamber fluidly isolated by one or more walls; and a plurality of
apertures positioned in the one or more walls to provide fluid
communication between the first and second chambers; wherein the
plurality of apertures are not covered by a filter or membrane.
12. The liquid-collection canister of claims 11, wherein the first
chamber is a main chamber and the second chamber is a filter
chamber, the liquid-collection canister further comprising: an
inlet capable of receiving fluids from a tissue site, the inlet
adapted to provide fluid communication between the tissue site and
the main chamber; one aperture of the plurality of apertures
positioned in a plane perpendicular to another of the plurality of
apertures, the one aperture having a first diameter and the other
aperture having a second diameter smaller than the first diameter;
and an outlet providing fluid communication with the filter
chamber, the outlet adapted to be fluidly connected to a reduced
pressure source.
13. The liquid-collection canister of claim 12, further comprising
a liquid-air separator positioned adjacent the outlet.
14. The liquid-collection canister of claim 12, further comprising
a filter positioned within the filter chamber.
15. The liquid-collection canister of claim 12, further comprising
a baffle positioned adjacent the inlet to inhibit splashing of
fluids as the fluids enter the liquid-collection canister through
the inlet.
16. The liquid-collection canister of claim 12, further comprising
a gelling agent positioned within the main chamber for creating a
gel upon contact with fluids received from the tissue site.
17. The liquid-collection canister of claim 12, wherein the one
aperture is a distance, D, from the other aperture.
18. The liquid-collection canister of claim 12, wherein the
liquid-collection canister has a primary operating orientation.
19. The liquid-collection canister of claim 18, wherein the one
aperture is positioned beneath the other aperture in the primary
operating orientation of the liquid-collection canister.
20. The liquid-collection canister of claim 18, wherein the one
aperture is horizontal to a force of gravity when the
liquid-collection canister is in the primary operating
orientation.
21. The liquid-collection canister of claim 18, wherein the other
aperture is vertical to a force of gravity when the
liquid-collection canister is in the primary operating orientation.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation of U.S. patent
application Ser. No. 15/971,873, filed May 4, 2018 which is a
continuation of U.S. patent application Ser. No. 14/271,991, filed
May 7, 2014, now U.S. Pat. No. 9,987,401, which is a divisional of
U.S. patent application Ser. No. 13/401,433 entitled
"Multi-Orientation Canister For Use With A Reduced Pressure
Treatment System", filed Feb. 21, 2012, now U.S. Pat. No. 8,758,315
each of which are hereby incorporated by reference for all
purposes.
BACKGROUND
1. Field of the Invention
[0002] The present invention relates generally to reduced pressure
treatment systems and more particularly to a multi-orientation
canister for use with a reduced pressure treatment system.
2. Description of Related Art
[0003] Clinical studies and practice have shown that providing a
reduced pressure in proximity to a tissue site augments and
accelerates the growth of new tissue at the tissue site. The
applications of this phenomenon are numerous, but one particular
application of reduced pressure involves treating wounds. This
treatment (frequently referred to in the medical community as
"negative pressure wound therapy," "reduced pressure therapy," or
"vacuum therapy") provides a number of benefits, including
migration of epithelial and subcutaneous tissues, improved blood
flow, and micro-deformation of tissue at the wound site. Together
these benefits result in increased development of granulation
tissue and faster healing times. Typically, reduced pressure is
applied by a reduced pressure source to tissue through a porous pad
or other manifold device. The porous pad contains cells or pores
that are capable of distributing reduced pressure to the tissue and
channeling fluids that are drawn from the tissue. The porous pad
often is incorporated into a dressing having other components that
facilitate treatment. Fluids drawn from the tissue site are often
collected in a canister.
SUMMARY
[0004] The problems presented by existing reduced pressure
treatment systems are solved by the systems and methods of the
illustrative embodiments described herein. In one illustrative
embodiment, a multi-orientation canister for use in a reduced
pressure tissue treatment includes an inlet adapted to be fluidly
connected with a tissue site, the inlet being capable of receiving
fluids from the tissue site, and a main chamber in fluid
communication with the inlet for receiving fluids from the inlet.
The multi-orientation canister further includes a filter chamber
separated from the main chamber by one or more filter chamber
walls. The one or more filter chamber walls includes a primary hole
having a first diameter and a secondary hole having a second
diameter smaller than the first diameter. The primary hole is
positioned through the one or more filter chamber walls for
providing a first path of fluid communication between the filter
chamber and the main chamber. The multi-orientation canister
further includes an outlet for providing fluid communication with
the filter chamber such that the outlet is adapted to be fluidly
connected to a reduced pressure source.
[0005] In another illustrative embodiment, a canister for use in a
reduced pressure tissue treatment includes one or more canister
walls arranged to create an enclosure with a main chamber and a
filter chamber positioned within the enclosure. The main chamber
may collect exudate received by a tissue site. The filter chamber
has a first filter chamber wall and a second filter chamber wall
for partitioning the filter chamber from the main chamber. A first
aperture extends through the first filter chamber wall spaced apart
from the one or more canister walls. A second aperture smaller than
the first aperture extends through the second filter chamber
wall.
[0006] In yet another illustrative embodiment, a canister for use
in a reduced pressure tissue treatment includes a main chamber
having an inlet adapted to receive liquid from a tissue site and a
filter chamber isolated from the main chamber by one or more walls.
The filter chamber has an outlet adapted to be fluidly coupled to a
reduced pressure source. A first aperture and a second aperture
extend through the one or more walls. The first aperture is
configured to provide fluid communication between the main chamber
and the filter chamber until the first aperture is occluded by the
liquid. Upon occlusion of the first aperture by the liquid, the
second aperture is configured to provide fluid communication
between the main chamber and the filter chamber.
[0007] In another illustrative embodiment, a liquid-collection
canister includes a first and second chamber fluidly isolated by
one or more walls and a plurality of apertures positioned in the
one or more walls to provide fluid communication between the first
and second chambers. The plurality of apertures are not covered by
a membrane.
[0008] In another illustrative embodiment, a canister for use in a
reduced pressure tissue treatment includes a main chamber having an
inlet adapted to receive liquid from a tissue site and a filter
chamber isolated from the main chamber by one or more walls. The
filter chamber includes an outlet adapted to be fluidly coupled to
a reduced pressure source. The canister further includes a filter
positioned within the filter chamber as well as a first aperture
and a second aperture extending through the one or more walls. The
first and second apertures are sized to prevent fluid, upon
entrance into the main chamber, from incidentally contacting the
filter.
[0009] In yet another illustrative embodiment, a reduced pressure
delivery system for applying a reduced pressure tissue treatment to
a tissue site includes a multi-orientation canister. The
multi-orientation canister includes one or more canister walls
arranged to create an enclosure, a main chamber positioned within
the enclosure for receiving exudate from a tissue site, and a
filter chamber positioned within the enclosure. The filter chamber
has a first filter chamber wall and a second filter chamber wall
for partitioning the filter chamber from the main chamber. A first
aperture extends through the first filter chamber wall spaced apart
from the one or more canister walls, and a second aperture smaller
than the first aperture extends through the second filter chamber
wall. The system further includes a reduced pressure source fluidly
connected to the multi-orientation canister for applying reduced
pressure to the tissue site, a manifold positioned adjacent the
tissue site, and a conduit fluidly connected between the main
chamber and the manifold for delivering fluids from the tissue site
to the main chamber.
[0010] In another illustrative embodiment, a reduced pressure
delivery system for applying a reduced pressure tissue treatment to
a tissue site includes a liquid-collection canister. The
liquid-collection canister includes a first and second chamber
fluidly isolated by one or more walls, and a plurality of apertures
positioned in the one or more walls to provide fluid communication
between the first and second chambers. The plurality of apertures
are not covered by a membrane. The system further includes a
reduced pressure source for applying reduced pressure to the tissue
site, a manifold positioned adjacent the tissue site, and a conduit
fluidly connected between the main chamber and the manifold for
delivering fluids from the tissue site to the main chamber.
[0011] In another illustrative embodiment, a method for emptying
fluids from a filter chamber positioned in a canister used in
reduced pressure tissue treatment includes the steps of receiving
fluids into a main chamber of the canister and rotating the
canister into a first position to cause fluids in the main chamber
to flow into the filter chamber through either a first aperture or
a second aperture. The first aperture is larger than the second
aperture, and the first aperture is located in a first plane
substantially perpendicular to a second plane of which the second
aperture is located. The method further includes the step of
rotating the canister into a second position to cause fluids in the
filter chamber to flow back into the main chamber through the first
aperture.
[0012] In yet another illustrative embodiment, a method for
extending the use of a filter positioned in a multi-orientation
canister used in reduced pressure tissue treatment includes the
step of receiving fluids into a main chamber of the
multi-orientation canister such that the fluids react with a
gelling agent to create a gel. The method further includes applying
reduced pressure to the main chamber via a first aperture
positioned in a partition that separates the main chamber from a
filter chamber until a fluid or gel level in the main chamber
covers the first aperture thereby causing a temporary blockage of
the first aperture. The method further includes the step of
responsive to the first aperture becoming temporarily blocked,
continuing to apply reduced pressure to the main chamber via a
second aperture positioned in the partition until the fluid or gel
level in the main chamber covers the second aperture. The first
aperture is a distance, D, from the second aperture. The method
further includes the step of responsive to the fluid or gel level
covering the second aperture, continuing to apply reduced pressure
to the main chamber through the first aperture causing the gel in
the main chamber to pulled into the filter chamber until both the
main chamber and the filter chamber are substantially full of
gel.
[0013] Other objects, features, and advantages of the illustrative
embodiments will become apparent with reference to the drawings and
detailed description that follow.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 illustrates a perspective view, with a portion shown
in cross-section, of a reduced pressure treatment system, including
a multi-orientation canister;
[0015] FIG. 2 illustrates a perspective view of one illustrative
embodiment of a multi-orientation canister, with a portion shown
with hidden lines, for use with the reduced pressure treatment
system illustrated in FIG. 1;
[0016] FIG. 3 illustrates a perspective, exploded view of the
multi-orientation canister illustrated in FIG. 2;
[0017] FIG. 4 illustrates another perspective, exploded view of the
multi-orientation canister illustrated in FIG. 2;
[0018] FIG. 5 illustrates a perspective view of the
multi-orientation canister of FIG. 2 with a back face plate and the
attached clip removed;
[0019] FIG. 6 illustrates a sectional view of the multi-orientation
canister of FIG. 5 taken along line 6-6; and
[0020] FIG. 7 illustrates a sectional view of the multi-orientation
canister of FIG. 5 taken along line 7-7.
DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
[0021] In the following detailed description of several
illustrative embodiments, reference is made to the accompanying
drawings that form a part hereof, and in which is shown by way of
illustration specific preferred embodiments in which the invention
may be practiced. These embodiments are described in sufficient
detail to enable those skilled in the art to practice the
invention, and it is understood that other embodiments may be
utilized and that logical structural, mechanical, electrical, and
chemical changes may be made without departing from the spirit or
scope of the invention. To avoid detail not necessary to enable
those skilled in the art to practice the embodiments described
herein, the description may omit certain information known to those
skilled in the art. The following detailed description is,
therefore, not to be taken in a limiting sense, and the scope of
the illustrative embodiments are defined only by the appended
claims. Unless otherwise indicated, as used herein, "or" does not
require mutual exclusivity.
[0022] The term "reduced pressure" as used herein generally refers
to a pressure less than the ambient pressure at a tissue site that
is being subjected to treatment. In most cases, this reduced
pressure will be less than the atmospheric pressure at which the
patient is located. Alternatively, the reduced pressure may be less
than a hydrostatic pressure associated with tissue at the tissue
site. Although the terms "vacuum" and "negative pressure" may be
used to describe the pressure applied to the tissue site, the
actual pressure reduction applied to the tissue site may be
significantly less than the pressure reduction normally associated
with a complete vacuum. Reduced pressure may initially generate
fluid flow in the area of the tissue site. As the hydrostatic
pressure around the tissue site approaches the desired reduced
pressure, the flow may subside, and the reduced pressure is then
maintained. Unless otherwise indicated, values of pressure stated
herein are gauge pressures. Similarly, references to increases in
reduced pressure typically refer to a decrease in absolute
pressure, while decreases in reduced pressure typically refer to an
increase in absolute pressure.
[0023] Reduced pressure treatment systems often use canisters for
collecting exudate, including liquids and other fluids, received
from a tissue site undergoing reduced pressure tissue treatment.
Exudate collected within the canister may move within the canister
by way of splashing or sloshing for a number of reasons. For
example, when the exudate enters the canister, they may splash or
foam within the canister enclosure. Likewise, once the exudate has
entered the canister, the exudate may slosh due to canister
movement. In some circumstances, the canister is worn by a patient
and may be subject to orientation changes as the patient bends over
or moves in general. The movement of the exudate within the
canister may cause the exudate to come into contact with a filter
used to protect the reduced pressure source from contamination.
[0024] The filter may be positioned within the canister to block
unwanted liquids from contaminating the reduced pressure source.
When wound exudate contacts the filter, even if the contact is
brief, such as when the filter is splashed by exudate or the
canister undergoes a brief orientation change due to patient
movement, the exudate may leave a protein film or deposit on the
filter. The protein deposits can build-up on the filter as the
filter is subject to repeated and prolonged contact with exudate,
compromising the filter's ability to allow air flow between the
canister and the reduced pressure source.
[0025] A blocked or compromised filter can create at least two
problems. The first problem is that restricting air flow between
the canister and the reduced pressure source causes air flow
restriction at the wound site. Restricting the ability of the
reduced pressure system from drawing air from the tissue site
results in an inability to maintain reduced pressure at the tissue
site. The other problem is that when the air flow between the
canister and the reduced pressure source is restricted, an alarm
may sound indicating that the canister is full and needs to be
emptied or changed, when, in fact, the canister is not full.
Reduced pressure therapy systems may have an alarm indicating that
a canister is full based on reduced pressure no longer being
supplied to the tissue site at a desired treatment level. Since
false canister-full alarms are both wasteful in time and resources,
it would be beneficial for a canister that is configured to be worn
on a patient's body, and is therefore, subject to orientation
changes, to have a means for protecting the filter from contacting
exudate until the canister is truly full of exudate. Additionally,
it would be beneficial for the canister to be able to drain
unwanted exudate away from the filter in the event the exudate
contacts the filter before the canister is full.
[0026] Referring to FIG. 1, an illustrative embodiment of a reduced
pressure treatment system 100 for treating a tissue site 102 on a
patient includes a dressing 104 placed proximate the tissue site
102, and a reduced pressure treatment unit 106 fluidly coupled to
the dressing 104 via a reduced pressure connector 108 and a conduit
110. As used herein, the term "tissue site" may refer to a wound or
defect located on or within any tissue, including but not limited
to, bone tissue, adipose tissue, muscle tissue, neural tissue,
dermal tissue, vascular tissue, connective tissue, cartilage,
tendons, or ligaments. The term "tissue site" may further refer to
areas of any tissue that are not necessarily wounded or defective,
but are instead areas in which it is desired to add or promote the
growth of additional tissue. For example, reduced pressure tissue
treatment may be used in certain tissue areas to grow additional
tissue that may be harvested and transplanted to another tissue
location.
[0027] The dressing 104 may include a manifold 112 placed proximate
the tissue site 102, a reduced pressure interface 114 fluidly
coupled to the manifold 112, and a drape 116. The drape 116 may be
placed over the manifold 112 to secure the manifold 112 at the
tissue site 102 and to create a fluidly sealed space 113 that is
located beneath the drape and that is at least partially occupied
by the manifold 112. In one embodiment, the drape 116 extends
beyond a perimeter of the tissue site 102 and is placed over a
patient's epidermis 118 to create the fluidly sealed space 113
between the drape 116 and the epidermis 118. The drape 116 may
include an adhesive 120 or bonding agent to secure the drape 116 to
the epidermis 118. In one embodiment, the adhesive 120 may be used
to create a seal between the drape 116 and the epidermis 118 to
prevent leakage of reduced pressure from the tissue site 102. In
another embodiment, a seal layer (not shown) such as, for example,
a hydrogel or other material may be disposed between the drape 116
and the epidermis 118 to augment or substitute for the sealing
properties of the adhesive 120. As used herein, "fluid seal" means
a seal adequate to maintain reduced pressure at a desired site
given the particular reduced pressure source involved.
[0028] The term manifold generally refers to a substance or
structure that is provided to assist in applying reduced pressure
to, delivering fluids to, or removing fluids from the tissue site
102. The manifold 112 typically includes a plurality of flow
channels or pathways that distribute fluids provided to and removed
from the tissue site around the manifold 112. In one illustrative
embodiment, the flow channels or pathways are interconnected to
improve distribution of fluids provided or removed from the tissue
site 102. Examples of manifolds 112 may include, for example,
without limitation, devices that have structural elements arranged
to form flow channels, such as, for example, cellular foam,
open-cell foam, porous tissue collections, liquids, gels, and foams
that include, or cure to include, flow channels. In one embodiment,
the manifold 112 is a porous foam and includes a plurality of
interconnected cells or pores that act as flow channels. The porous
foam may be a polyurethane, open-cell, reticulated foam such as
GranuFoam.RTM. material manufactured by Kinetic Concepts,
Incorporated of San Antonio, Tex. Other embodiments may include
"closed cells."
[0029] Referring still to FIG. 1, the reduced pressure interface
114 may be positioned adjacent to or coupled to the drape 116 to
provide fluid access to the manifold 112. The reduced pressure
interface 114 may be coupled to the drape 116 by an adhesive 121
similar to the adhesive 120 described above. The conduit 110 and
the reduced pressure connector 108 fluidly couple the reduced
pressure treatment unit 106 and the reduced pressure interface 114.
The reduced pressure interface 114 allows the reduced pressure to
be delivered to the tissue site 102. While the amount and nature of
reduced pressure applied to the tissue site 102 will typically vary
according to the application, the reduced pressure treatment unit
106 will typically provide reduced pressure between -5 mm Hg and
-500 mm Hg and more typically between -100 mm Hg and -300 mm
Hg.
[0030] The reduced pressure treatment unit 106 may include a
canister 122 for collecting exudate and a sensing unit 130 in fluid
communication with a reduced pressure source 124. While FIG. 1
illustrates that the reduced pressure treatment unit 106 houses the
canister 122, the sensing unit 130, and the reduced pressure source
124 in a single housing unit, it should be appreciated that
elements of the reduced pressure treatment unit 106, which may
include the canister 122, the sensing unit 130, and the reduced
pressure source 124, may be located in a number of different
housing units that are fluidly connected (not shown). The canister
122 will be discussed in more detail below.
[0031] The conduit 110 may be a multi-lumen conduit or tube that
provides a continuous conduit between the reduced pressure
interface 114 and the reduced pressure connector 108 positioned on
the reduced pressure treatment unit 106. While the conduit 110
illustrates multiple lumens, it should be appreciated that the
reduced pressure treatment system 100 may operate using a single
lumen tube. The conduit 110 may include conduits for carrying
reduced pressure and removing liquids alone or may be combined with
one or more lumens for sensing pressure and providing a vent or a
purging capability. The conduit 110 may include a main lumen 126
and one or more ancillary lumens 128 and is adapted to maintain
fluid isolation between the main lumen 126 and the one or more
ancillary lumens 128. Liquids or exudate communicated from the
manifold 112 through the main lumen 126 are removed from the
conduit 110 and retained within the canister 122. The one or more
ancillary lumens 128 fluidly communicate reduced pressure levels
from the tissue site 102 to the sensing unit 130.
[0032] In the embodiment illustrated in FIG. 1, the reduced
pressure source 124 is an electrically-driven vacuum pump. In
another implementation, the reduced pressure source 124 may instead
be a manually-actuated or manually-charged pump that does not
require electrical power. The reduced pressure source 124 instead
may be any other type of reduced pressure pump, or alternatively a
wall suction port such as those available in hospitals and other
medical facilities. The reduced pressure source 124 may be housed
within or used in conjunction with the reduced pressure treatment
unit 106, which may also contain sensors, processing units, alarm
indicators, memory, databases, software, display units, and user
interfaces 132 that further facilitate the application of reduced
pressure treatment to the tissue site 102. In one example,
pressure-detection sensors (not shown) located in the sensing unit
130 may be disposed at or near the reduced pressure source 124. The
pressure-detection sensors may receive pressure data from the
reduced pressure interface 114 via the one or more ancillary lumens
128 that are dedicated to delivering reduced pressure data to the
pressure-detection sensors. The pressure-detection sensors may
communicate with a processing unit that monitors and controls the
reduced pressure that is delivered by the reduced pressure source
124.
[0033] Referring now primarily to FIGS. 2-7, but still with
reference to FIG. 1, the canister 122 will be described in more
detail. The canister 122 is adapted to function in a number of
different orientations, and, thus, the canister 122 may be referred
to as a multi-orientation canister. The canister 122, however, will
generally have a primary operating orientation that will maximize
the canister's 122 operational capacity during reduced pressure
tissue treatments. Maximizing the canister's 122 operational
capacity includes maximizing the life span of any filters used in
the canister 122, reducing or eliminating false canister-full
alarms, and maximizing the canister's 122 volumetric capacity for
exudate storage.
[0034] The canister 122 is defined by one or more canister walls
134 arranged to create an enclosure 136. The one or more canister
walls 134 may generally define the exterior of the canister 122.
The canister 122 includes an inlet 138, a main chamber 140, a
filter chamber 142, and an outlet 144. In one embodiment, the
canister 122 is in its primary operating orientation when the inlet
138 is generally positioned superior to the main chamber 140 and
the filter chamber 142.
[0035] The canister 122 may be formed in a number of different ways
and from a number of different materials. As illustrated, with
particular clarity in the exploded view of FIGS. 3 and 4, the
canister 122 may be formed or assembled by joining a main body 162
with a back face plate 164. In one embodiment, the main body 162
and the back face plate 164 may be joined by a tongue-and-groove
fitting. In another embodiment, the main body 162 and the back face
plate 164 may be joined by and adhesive. Pre-assembled, the main
body 162 may have a number of recesses, such as recesses 166 and
168 Likewise, the back face plate 164 may have number of
protrusions, such as protrusions 170 and 172. When assembled, the
recesses 166 and 168 may receive the protrusions 170 and 172,
respectively. In this embodiment, the joining of the recesses 166,
168 with the protrusions 170, 172 define the main chamber 140 and
the filter chamber 142. The joining may further define one or more
apertures that provide fluid communication between the main chamber
140 and the filter chamber 142. It should be appreciated, however,
that other configurations may be available. For example, in one
embodiment (not shown), the main body 162 may have interior walls
that are preformed to define the perimeters of the main chamber 140
and the filter chamber 142. The interior walls may further include
preformed apertures that provide fluid communication between the
main chamber 140 and the filter chamber 142. In this embodiment,
the back face plate 164 does not include any protrusions that
function to substantively join with the main body 162 to form the
interior walls that define the main chamber 140 and the filter
chamber 142.
[0036] Referring again primarily to FIGS. 2-7, the inlet 138 is
fluidly connected with the tissue site 102 and is capable of
receiving exudate from the tissue site 102. The main chamber 140 is
in fluid communication with the inlet 138 and is adapted to receive
exudate from the inlet 138. In one embodiment, the canister 122 may
further include a receiving chamber 146 positioned between the
inlet 138 and the main chamber 140. The receiving chamber 146 may
be configured so as to inhibit exudate from splashing when the
exudate is transferred from the inlet 138 to the main chamber 140.
In another embodiment, a baffle (not shown) may be positioned
adjacent the inlet 138 to inhibit the splashing of exudate as the
exudate enters the canister 122 through the inlet 138. In yet
another embodiment, a baffle may be positioned adjacent the
receiving chamber 146 to provide an additional mechanism to reduced
exudate splash. The receiving chamber 146 includes an aperture 148
for providing fluid communication between the receiving chamber 146
and the main chamber 140.
[0037] The main chamber 140 receives fluids from the inlet 138. A
gelling agent (not shown) may be positioned within the main chamber
140. The gelling agent may form a gel upon contact with exudate
received from the tissue site 102. The gel formed from the
combination of the gelling agent and the exudate may help prevent
the exudate from splashing around within the canister 122 when the
canister 122 is moved.
[0038] The filter chamber 142 is separated from the main chamber
140 by one or more filter chamber walls 150 or partitions. The
recesses 166, 168 of the main body 162 may join with the
protrusions 170, 172 of the back face plate 164 to form the one or
more filter chamber walls 150. The filter chamber walls 150 fluidly
separate the main chamber 140 from the filter chamber 142. In one
embodiment, the filter chamber 142 is defined by at least a first
filter chamber wall 156 and a second filter chamber wall 158. In
this embodiment, the recess 166 may join with the protrusion 170 to
form the first filter chamber wall 156, and the recess 168 may join
with the protrusion 172 to form the second filter chamber wall 158.
The first filter chamber wall 156 may be substantially normal to
the second filter chamber wall 158. The one or more filter chamber
walls 150 may intersect with a centroid 160 of the canister 122.
The "centroid" referred to herein is the geometric enter of the
canister's 122 three-dimensional shape based on an average of all
points on the canister 122. The geometric center may coincide with
the canister's 122 center of mass, however, the geometric center is
not required to coincide with the center of mass. In a specific,
non-limiting embodiment, the first filter chamber wall 156 may
intersect the centroid 160 of the canister 122.
[0039] Referring still primarily to FIGS. 2-7, the one or more
filter chamber walls 150 may include or define a first aperture 152
and a second aperture 154. The first and second apertures 152, 154
may be formed in a number of different shapes. In specific,
non-limiting examples, the first and second apertures 152, 154 may
be round or square. The first aperture 152 may be formed through
the first filter chamber wall 156 and the second aperture 154 may
be formed through the second filter chamber wall 158. The first
aperture 152 is a distance, D, from the second aperture 154 in
three-dimensional space. The first aperture 152 is configured to
provide a first path of fluid communication between the main
chamber 140 and the filter chamber 142. The second aperture 154 is
configured to provide another path of fluid communication between
the main chamber 140 and the filter chamber 142. In one embodiment,
the first aperture 152 is configured to provide the primary path of
fluid communication between the main chamber 140 and the filter
chamber 142. The first aperture 152 is a first size and the second
aperture 154 is a second size. In one embodiment, the first
aperture 152 is larger than the second aperture 154. In another
embodiment, the first aperture 152 is the same size as the second
aperture 154. In one embodiment, the size of the first and second
apertures 152, 154 are configured to prevent fluid, upon entering
the main chamber 140, from inadvertently splashing or contacting
the interior of the filter chamber 142. In another embodiment, the
size of the first and second apertures 152, 154, are configured to
prevent gel from entering the filter chamber 142 due to splashing
or sloshing.
[0040] The first aperture 152 may be positioned on or adjacent the
canister's 122 centroid 160. The first aperture 152 may be
positioned through the first filter chamber wall 156 in a location
that is not adjacent to the one or more canister walls 134 that
define the exterior of the canister 122 to inhibit exudate from
entering the first aperture 152 as a result of exudate sloshing or
splashing. In other words, the first aperture 152 may be spaced
apart from the one or more canister walls 134. The second aperture
154 may be positioned through the second filter chamber wall 158 in
a location that maximizes the distance between the first aperture
152 and the second aperture 154. In another embodiment, the second
aperture 154 may be positioned through the second filter chamber
wall 158 as close to the top of the main chamber 140 as possible
when the canister 122 is viewed in its primary operating
orientation.
[0041] As shown, the outlet 144 is positioned adjacent the filter
chamber 142 through the one or more canister walls 134. The outlet
144 is adapted to provide fluid communication between the reduced
pressure source 124 and the filter chamber 142. A filter (not
shown) is positioned within the filter chamber 142. The filter will
typically be a hydrophobic filter to prevent exudate and liquids
from exiting the canister 122 and reaching the reduced pressure
source 124. In addition to a filter, a liquid-air separator (not
shown) may be placed between the filter and the reduced pressure
source 124 for additional protection of the reduced pressure source
124.
[0042] In operation, the reduced pressure source 124 supplies
reduced pressure to the tissue site 102 via a fluid communication
path linking the reduced pressure source 124 and the tissue site
102. As described above, the manifold 112, the reduced pressure
interface 114, the conduit 110, and the canister 122 are all part
of the fluid communication path linking the reduced pressure source
124 to the tissue site 102. As reduced pressure is supplied to the
tissue site 102, exudate, including liquids, is removed from the
tissue site 102 and deposited within the canister 122 for storage.
The exudate is first deposited in the main chamber 140 of the
canister 122.
[0043] The reduced pressure is supplied to the canister 122 via the
outlet 144 that is in fluid communication with the filter chamber
142. The filter chamber 142 is in fluid communication with the main
chamber 140 by means of the first aperture 152 and the second
aperture 154. The second aperture 154 may be significantly smaller
than the first aperture 152 such that the first aperture 152 is
generally the path of least resistance for fluid communication
between the filter chamber 142 and the main chamber 140. In the
canister's 122 primary operating orientation, the second aperture
154 may be above or superior in position to the first aperture 152.
In this embodiment, when the canister 122 first begins to fill with
exudate, reduced pressure is mainly supplied from the filter
chamber 142 to the main chamber 140 by way of the first aperture
152 because the first aperture 152 generally presents the path of
least resistance. As the main chamber 140 fills with exudate, the
first aperture 152 may become occluded as the fluid level in the
main chamber 140 reaches the first aperture 152. The first aperture
may be occluded as a result of surface tensions.
[0044] If the first aperture 152 becomes occluded or blocked with
fluid, the second aperture 154 becomes the path of least resistance
between the filter chamber 142 and the main chamber 140. Fluid will
continue to fill the main chamber 140 until the fluid level reaches
the second aperture 154, occluding or blocking the second aperture
154. In this embodiment, when both the first aperture 152 and the
second aperture 154 are blocked by fluid as a result of the main
chamber 140 becoming full, the path of least resistance between the
filter chamber 142 and the main chamber 140 is again through the
first aperture 152. Sufficient pressure is created within the
filter chamber 142 to cause the fluid in the main chamber 140 to be
pulled into the filter chamber 142 though the first aperture 152.
Fluid may continue filling the filter chamber 142 until the fluid
level in the filter chamber 142 fills, blocking the filter and
outlet 144. The configuration of the canister 122 increases the
useful life span of the filter by limiting the filter's exposure to
exudate before the canister 122 is full. Additionally, the
configuration of the canister 122 increases the canister's useful
volumetric capacity for storing exudate by filling the main chamber
140 with fluids before the filter chamber 142 is filled with
fluids.
[0045] In operation, fluids that have entered the filter chamber
142 due to movement of the canister 122 may be removed or drained
from the filter chamber 142. Fluids received from the tissue site
102 are deposited into the main chamber 140 of the canister 122.
The canister 122 may be moved during operation causing the canister
122 to be rotated into a first position, away from the canister's
122 primary operating orientation. The rotation of the canister 122
may cause fluids in the main chamber 140 to flow into the filter
chamber 142 through either the first aperture 152 or the second
aperture 154. The second aperture 154 being superior in position to
the first aperture 152 when the canister 122 is positioned in its
primary operating orientation. If the canister 122 is then rotated
back into a second position, substantially aligned with the
canister's 122 primary operating orientation, the configuration of
the canister 122 in general, and the placement of the apertures
152, 154 specifically, allows fluids in the filter chamber 142 to
flow back into the main chamber 140 through the first aperture
152.
[0046] In operation, the useful life of the filter positioned in
the canister 122 may be extended. Fluids from the tissue site 102
are received into the main chamber 140 of the canister 122. The
fluids may react with a gelling agent contained within the main
chamber 140 to create a gel. Reduced pressure from the reduced
pressure source 124 may be applied to the main chamber 140 via the
first aperture 152 until a fluid or gel level in the main chamber
140 covers or reaches the first aperture 152, causing a temporary
blockage of the first aperture 152. In response to the first
aperture 152 becoming temporarily blocked, reduced pressure is
supplied to the main chamber 140 via the second aperture 154 until
the fluid or gel level in the main chamber 140 covers or reaches
the second aperture 154. The second aperture 154 is superior in
position to the first aperture 152 when the canister 122 is
positioned in its primary operating orientation. Additionally, the
second aperture 154 is significantly smaller is size than the first
aperture 152 such that the first aperture 152 generally provides
the path of least resistance unless only the first aperture 152 is
blocked. In response to the fluid or gel level covering the second
aperture 154, reduced pressure is again applied to the main chamber
140 through the first aperture 152 causing the gel in the main
chamber 140 to be pulled into the filter chamber 142 until both the
main chamber 140 and the filter chamber 142 are substantially full
of gel.
[0047] During operation of another embodiment, the second aperture
154 is substantially the same size as the first aperture 152. In
response to a liquid or gel level covering the first aperture 152,
the second aperture 154 becomes the path of least resistance.
However, in response to the liquid or gel level covering the second
aperture 154, reduced pressure is applied to the main chamber 140
through both the first and second apertures 152, 154 causing the
liquid or gel in the main chamber 140 to be pulled into the filter
chamber 142 until both the main chamber 140 and the filter chamber
142 are substantially full of liquid or gel.
[0048] In one embodiment, the canister 122 is referred to as a
liquid-collection canister. The liquid-collection canister includes
a first and second chamber fluidly isolated from one another by one
or more walls. The first chamber may be a main chamber similar to
the main chamber 140 and the second chamber may be a filter chamber
similar to the filter chamber 142. A plurality of apertures may be
positioned in the one or more walls to provide fluid communication
between the first and second chambers. The liquid-collection
canister may further include an inlet capable of receiving fluids
from a tissue site. The inlet is adapted to provide fluid
communication between the tissue site and the first chamber. One
aperture of the plurality of apertures may be positioned in a plane
perpendicular to another of the plurality of apertures. The one
aperture may have a first diameter larger than a second diameter of
the another of the plurality of apertures. The one aperture may be
positioned below the another aperture in the liquid-collection
canister's primary operating orientation. The liquid-collection
canister may further include an outlet for providing fluid
communication with the second chamber such that the outlet is
adapted to be fluidly connected to a reduced pressure source.
[0049] It should be apparent from the foregoing that an invention
having significant advantages has been provided. While the
invention is shown in only a few of its forms, it is not just
limited but is susceptible to various changes and modifications
without departing from the spirit thereof.
[0050] While a number of discrete embodiments have been described,
aspects of each embodiment may not be specific to only that
embodiment and it is specifically contemplated that features of
embodiments may be combined with features of other embodiments.
* * * * *