U.S. patent application number 14/730806 was filed with the patent office on 2015-09-24 for vacuum pump systems for prosthetic limbs and methods of using the same.
This patent application is currently assigned to NORTHWESTERN UNIVERSITY. The applicant listed for this patent is Ryan J. Caldwell, Wei Chen, Andrew H. Hansen, Bennett E. Kuhar, Andrew J. Nelson, Eric Nickel, Regan A. Radcliffe, Sean M. Wood, Kevin A. Yngve. Invention is credited to Ryan J. Caldwell, Wei Chen, Andrew H. Hansen, Bennett E. Kuhar, Andrew J. Nelson, Eric Nickel, Regan A. Radcliffe, Sean M. Wood, Kevin A. Yngve.
Application Number | 20150265435 14/730806 |
Document ID | / |
Family ID | 47422962 |
Filed Date | 2015-09-24 |
United States Patent
Application |
20150265435 |
Kind Code |
A1 |
Caldwell; Ryan J. ; et
al. |
September 24, 2015 |
VACUUM PUMP SYSTEMS FOR PROSTHETIC LIMBS AND METHODS OF USING THE
SAME
Abstract
Pump systems for use in suspension of a prosthetic device from a
residual limb and methods of suspending a prosthetic device from a
residual limb are disclosed. The pump systems include a
mechanically activated pump having a first compression member
coupled to a second compression member, a compressible bladder
disposed between the first and second compression members, and
coupling elements that engage and couple together the first and
second compression members. The mechanically activated pump may be
connected with an electrically activated pump within a fluid
circuit of a hybrid pump system to provide vacuum engagement
between a prosthetic device and a residual limb.
Inventors: |
Caldwell; Ryan J.; (Long
Grove, IL) ; Hansen; Andrew H.; (Apple Valley,
MN) ; Wood; Sean M.; (Gardena, CA) ; Chen;
Wei; (Glenview, IL) ; Radcliffe; Regan A.;
(Sunnyvale, CA) ; Yngve; Kevin A.; (Evanston,
IL) ; Kuhar; Bennett E.; (Concor Twp., OH) ;
Nelson; Andrew J.; (Chicago, IL) ; Nickel; Eric;
(Brooklyn Park, MN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Caldwell; Ryan J.
Hansen; Andrew H.
Wood; Sean M.
Chen; Wei
Radcliffe; Regan A.
Yngve; Kevin A.
Kuhar; Bennett E.
Nelson; Andrew J.
Nickel; Eric |
Long Grove
Apple Valley
Gardena
Glenview
Sunnyvale
Evanston
Concor Twp.
Chicago
Brooklyn Park |
IL
MN
CA
IL
CA
IL
OH
IL
MN |
US
US
US
US
US
US
US
US
US |
|
|
Assignee: |
NORTHWESTERN UNIVERSITY
Evanston
IL
|
Family ID: |
47422962 |
Appl. No.: |
14/730806 |
Filed: |
June 4, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13529833 |
Jun 21, 2012 |
9066822 |
|
|
14730806 |
|
|
|
|
61571233 |
Jun 23, 2011 |
|
|
|
Current U.S.
Class: |
623/34 |
Current CPC
Class: |
A61F 2/60 20130101; A61F
2002/607 20130101; A61F 2002/5073 20130101; A61F 2/80 20130101;
A61F 2002/689 20130101; A61F 2002/501 20130101; A61F 2002/747
20130101; A61F 2002/608 20130101; A61F 2002/802 20130101; A61F
2002/6809 20130101; A61F 2/70 20130101; A61F 2002/741 20130101;
A61F 2/68 20130101; A61F 2002/7655 20130101; A61F 2002/742
20130101; A61F 2002/704 20130101 |
International
Class: |
A61F 2/80 20060101
A61F002/80; A61F 2/60 20060101 A61F002/60; A61F 2/68 20060101
A61F002/68; A61F 2/70 20060101 A61F002/70 |
Goverment Interests
CONTRACTUAL ORIGIN OF THE INVENTION
[0002] This invention was made with government support under Grant
No. W81XWH-10-1-0744 awarded by the U.S. Army Medical Research and
Material Command. The government has certain rights in the
invention.
Claims
1. A pump system for use in suspension of a prosthetic device from
a residual limb comprising: a prosthetic device having a residual
limb receiving socket; a mechanically activated pump having pumping
action that requires a mechanical input via movement of the
prosthetic device and having a first compression member coupled to
a second compression member; the mechanically activated pump being
connected within a fluid circuit that evacuates air from the
residual limb receiving socket; an elastomeric element disposed
between the first and second compression members and being in fluid
communication with the fluid circuit; and coupling elements that
engage and couple together the first and second compression
members, wherein all of the coupling elements are disposed about an
outer perimeter of the elastomeric element.
2. The pump system in accordance with claim 1, wherein the
elastomeric element further comprises a compressible bladder.
3. (canceled)
4. The pump system in accordance with claim 1, wherein the residual
limb receiving socket is configured to receive a transfemoral
residual limb.
5. The pump system in accordance with claim 1, wherein the residual
limb receiving socket is configured to receive a transtibial
residual limb.
6. The pump system in accordance with claim 1, wherein the first
compression member is pivotally coupled to the second compression
member.
7-8. (canceled)
9. The pump system in accordance with claim 1, wherein the first
compression member translates relative to the second compression
member.
10. The pump system in accordance with claim 1, further comprising
a separate electrically activated pump having an electrical power
source and pumping action that requires an electrical input from
the electrical power source, wherein the electrically activated
pump is coupled within a fluid circuit with the mechanically
activated pump.
11. (canceled)
12. The pump system in accordance with claim 10, wherein the
electrically activated pump is disposed above or below the
mechanically activated pump.
13. (canceled)
14. The pump system in accordance with claim 10, wherein the
electrically activated pump is disposed outward from the outer
perimeter of the elastomeric element.
15. The pump system in accordance with claim 10, wherein the
electrical power source further comprises a battery.
16. The pump system in accordance with claim 15, wherein the
battery is rechargeable.
17-35. (canceled)
36. The pump system in accordance with claim 1, wherein the
mechanically activated pump, and the mechanically activated pump
evacuates air from the residual limb receiving socket when the
prosthetic device is used to walk.
37. The pump system in accordance with claim 1, wherein a
preselected level of vacuum within the residual limb receiving
socket is maintained by operation of the mechanically activated
pump.
38. The pump system in accordance with claim 1, wherein at least
one spring is disposed between the first compression member and the
second compression member.
39. The pump system in accordance with claim 38, wherein the at
least one spring biases the first compression member toward a
position spaced apart from the second compression member.
40. The pump system in accordance with claim 10, further comprising
a controller and wherein the fluid circuit and controller are
configured to evacuate air from the residual limb receiving socket
by operating the electrically activated pump when the prosthetic
device is not being used to walk and the air pressure within the
socket is outside of a preselected range of values.
41. The pump system in accordance with claim 10, further comprising
a controller and wherein the fluid circuit and controller are
configured to evacuate air from the residual limb receiving socket
by operating the electrically activated pump when the residual limb
is initially received within the socket.
42. The pump system in accordance with claim 10, wherein a
preselected level of vacuum within the residual limb receiving
socket is maintained by operation of the electrically activated
pump.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation application of co-pending
U.S. patent application Ser. No. 13/529,833, filed Jun. 21, 2012,
and further claims benefits and priority of U.S. Provisional Patent
Application Ser. No. 61/571,233, filed Jun. 23, 2011, the
disclosures of which are hereby incorporated by reference in their
entirety.
BACKGROUND OF THE INVENTION
[0003] 1. Field of the Invention
[0004] The present invention generally relates to suspension
systems for prosthetic devices, and more particularly to vacuum
pump systems for prosthetic limbs that include at least a
mechanically activated pump.
[0005] 2. Discussion of the Prior Art
[0006] Various systems have been developed for coupling a
prosthetic device or prosthetic limb to a residual limb. The
residual limb is connected to the prosthesis via a socket which
receives and holds in place an end portion of the residual limb.
Suspension is the mechanism that holds the socket to the residual
limb. Vacuum is a form of suspension that uses a difference in
atmospheric pressure to hold a socket to the residual limb. Liners
help protect the residual limb tissue by providing cushioning and
helping distribute the applied negative pressure in a uniform
manner.
[0007] Vacuum pump technology is used to suspend the socket to the
residual limb by creating a vacuum between the liner and the
socket. The ability to maintain vacuum at a relatively consistent
level can help avoid undesirable movement between the socket and
the residual limb which improves comfort and avoids soft tissue
damage.
[0008] Vacuum pumps fall into two categories, namely, mechanically
activated or electrically activated. Electrically activated pumps
tend to evacuate air more quickly, are able to monitor and adjust
the vacuum pressure, and to automatically initiate pump operation
if the vacuum pressure is not at least at a preselected threshold.
However, electrically activated pumps include a small DC motor that
requires a power source, such as disposable or rechargeable
batteries. Electrically activated pumps also may generate
undesirable noise.
[0009] Mechanically activated pumps use the walking motion of the
user to create vacuum. One way pressure valves permit proper
maintenance of vacuum pressure, without access to electricity. The
necessary vacuum may be maintained indefinitely as long as there
are no leaks in the system and/or the user walks occasionally.
However, the mechanically activated pumps do not provide initial
evacuation of air without effort, take longer to achieve operative
vacuum levels, and typically need periodic motion to maintain
appropriate vacuum levels. Mechanically activated pumps also tend
to require a significant length for operation, as they typically
operate by using a telescoping assembly. Depending on the number of
parallel alignment elements involved, length can be important
within a telescoping assembly, so as to provide adequate surface
engagement to avoid binding. Mechanically activated pumps generally
are configured for mounting below the knee because the pumps are
too long to fit between the socket and the knee joint of the
prosthetic limb, and as such, are not as well suited for
transfemoral amputees.
[0010] Mechanically activated pumps also typically use a piston
within a cylinder for pumping, or systems that include a flexible
toroidal or ring-shaped reservoir or bladder that has a relatively
large cylindrical telescopic tube running through the center, in
place of a section of a lower limb pylon. The tube must be
relatively large and of length sufficient to avoid binding, while
withstanding the significant stresses encountered. In turn, the
reservoir must be constructed to account for the large opening
through the center.
[0011] For some users, such as military personnel with amputation
who wish to return to active duty, there is an enhanced need to be
able to maintain acceptable physical performance. An active soldier
with amputation may be in the field for a prolonged period of time,
with a need to maintain proper vacuum levels for suspension, while
being without access to a power source for recharging of batteries.
Thus, there exists a need for a compact, quiet, unobtrusive vacuum
pump system with adjustable pressure and minimal battery recharging
needs that will evacuate air from a cavity between a socket of a
prosthetic limb and a residual limb.
[0012] The present invention addresses shortcomings in prior art
vacuum pump systems for prosthetic limbs, while providing enhanced
pumping systems that enable more flexible design and enhanced
performance.
SUMMARY OF THE INVENTION
[0013] The purpose and advantages of the invention will be set
forth in and apparent from the description and drawings that
follow, as well as will be learned by practice of the claimed
subject matter.
[0014] The present disclosure generally provides pump systems that
include mechanically activated pumps having a lower profile design
while still being able to provide vacuum within the desired range
of 15 mmHg to 25 mmHg. The mechanically activated pumps utilize a
bladder but do not require a large central opening for a tubular
telescopic assembly. By avoiding use of such a central tubular
telescopic assembly, the mechanically activated pumps of the
present disclosure permit use of a relatively large diameter
bladder having a greater volume and which requires less
displacement to achieve adequate pumping capacity. Such pumps
optionally permit location above or below the knee joint in a
transfemoral prosthetic limb, or compact placement within a
transtibial prosthetic limb.
[0015] The mechanically activated pumps of the present disclosure
may utilize first and second compression members, with a
compressible bladder disposed therebetween and any of a variety of
coupling elements disposed about an outer perimeter of the
compressible bladder. Thus, the compression members may be
pivotally coupled in a configuration that permits angular
displacement of a first compression member relative to a second
compression member, or in a configuration that permits the first
compression member to translate, maintaining a parallel
relationship to the second compression member. Alternatively, the
compression members may be coupled in a configuration that does not
involve any pivotal connection, and permits the first compression
member to translate relative to the second compression member.
[0016] To further enhance the performance of pump systems for
suspension of a prosthetic limb, the present disclosure also
provides pump systems that include an electrically activated pump,
such as of the micro pump type utilized in exclusively electrical
systems, thereby providing a modular hybrid system. A hybrid pump
system may offer significant advantages, such as the desired rapid
engagement upon initial donning of the prosthetic device, while not
requiring solely battery power to evacuate air and to maintain
appropriate vacuum levels. This may permit elongated intervals
between charging of rechargeable batteries or battery packs, or
between replacement of disposable batteries. A hybrid system also
may provide for better optimization of the size and capacities of
the components utilized, as the mechanically activated pump portion
of a hybrid system need not be as concerned with the ability to
rapidly establish initial evacuation solely via the mechanically
activated pump, while the electrically activated pump is less
likely to be cycled during the course of many activities that now
will provide operation of a mechanically activated pump.
Accordingly, depending on the length of the residual limb, it may
be possible to implement a hybrid pump system of this disclosure
within a system having a relatively short length, such that it
could be located above the knee joint for a transfemoral
amputee.
[0017] Thus, a hybrid system may utilize the respective strengths
of mechanically and electrically activated pumps to achieve
superior overall performance, while essentially also providing a
redundant pump system to ensure at least adequate performance for
the user. By utilizing a low profile design, the systems also
permit placement above the knee for a transfemoral amputee, for
direct interaction with a socket of a prosthetic device. The pump
systems preferably have a height of about 1.5 inches or less, to
permit positioning above the knee. It will be appreciated that the
height may be more or less, depending on the configuration of
mechanically activated pump, and whether or not the system includes
an electrically activated pump, as well as its configuration. This,
in turn, helps avoid many of the hindrances associated with below
knee systems, while permitting an inline assembly that need not
require external tubing.
[0018] Accordingly, in a first aspect, disclosed herein is a pump
system for use in suspension of a prosthetic device from a residual
limb. The pump system includes a mechanically activated pump having
a first compression member coupled to a second compression member,
a compressible bladder disposed between the first and second
compression members, and coupling elements that engage and couple
together the first and second compression members, wherein all of
the coupling elements are disposed about an outer perimeter of the
compressible bladder.
[0019] In a second aspect, disclosed herein is a method of
suspending a prosthetic device from a residual limb. The method
includes providing a prosthetic device having a socket that
receives the residual limb. The method further includes providing a
mechanically activated pump having a first compression member
coupled to a second compression member, a compressible bladder
disposed between the first and second compression members, and
coupling elements engaging and coupling together the first and
second compression members, wherein all of the coupling elements
are disposed about an outer perimeter of the compressible bladder.
The method also includes providing a fluid circuit in communication
with the socket and the compressible bladder, the fluid circuit
being configured to evacuate air from the socket when operating the
mechanically activated pump, and operating the mechanically
activated pump when the prosthetic device is used to walk.
[0020] In a third aspect, disclosed herein is hybrid pump system
for use in suspension of a prosthetic device from a residual limb.
The hybrid pump system includes a mechanically activated pump, an
electrically activated pump, and the mechanically activated pump
and electrically activated pump are connected within a fluid
circuit that provides vacuum engagement between the prosthetic
device and the residual limb.
[0021] It will be appreciated that the unique mechanically
activated pumps disclosed herein provide advantageous
configurations that permit low profile arrangements to be utilized
in suspending a prosthetic device from a residual limb. It also
will be appreciated from this disclosure that a mechanically
activated pump may be connected to a fluid circuit that includes an
electrically activated pump, so as to create a hybrid system for
use in suspension of a prosthetic device from a residual limb. It
is contemplated that various configuration may be utilized and the
appended claims are not to be limited to the examples
illustrated.
[0022] Thus, the present disclosure presents alternatives to the
prior art mechanically activated pumps, as well as to systems that
use only an electrically activated pump, where the prior art
systems have proven to be less effective than desired.
[0023] It is to be understood that both the foregoing general
description and the following detailed description are exemplary
and provided for purposes of explanation only, and are not
restrictive of the subject matter claimed. Further features and
objects of the present disclosure will become more fully apparent
in the following description of the preferred embodiments and from
the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In describing the preferred embodiments, reference is made
to the accompanying drawing figures wherein like parts have like
reference numerals, and wherein:
[0025] FIG. 1A is a simplified side view of a prosthetic device in
the form of a prosthetic limb for a transfemoral amputee having a
first example pump system that includes a mechanically activated
pump, with the pump system also including an electrically activated
pump, so as to provide a hybrid pump system.
[0026] FIG. 1B is a simplified side view of a prosthetic device in
the form of a prosthetic limb for a transtibial amputee having the
pump system shown in FIG. 1A.
[0027] FIG. 1C is a side perspective view of the pump system shown
in FIG. 1A.
[0028] FIG. 1D is a lower rear perspective view of the pump system
shown in FIG. 1A.
[0029] FIG. 1E is a side view of the pump system shown in FIG.
1A.
[0030] FIG. 1F is an upper front perspective view of the pump
system shown in FIG. 1A.
[0031] FIG. 1G is simplified top view of a layout of major
components within the electrically activated pump of the pump
system shown in FIG. 1A.
[0032] FIG. 1H is further simplified upper perspective view of a
layout of major components within the electrically activated pump
of the pump system shown in FIG. 1A.
[0033] FIG. 1I is an upper front perspective partially exploded
view of the pump system shown in FIG. 1A.
[0034] FIG. 1J is an alternative view of that shown in FIG. 1I,
showing a portion of the fluid circuit of the pump system shown in
FIG. 1A.
[0035] FIG. 1K is a side partially exploded view of the pump system
shown in FIG. 1A.
[0036] FIG. 1L is an alternative view of that shown in FIG. 1K,
showing a portion of the fluid circuit of the pump system shown in
FIG. 1A.
[0037] FIG. 1M is a schematic view of the process involved in using
the pump system shown in FIG. 1A.
[0038] FIG. 1N is a schematic view of the control system for the
pump system shown in FIG. 1A.
[0039] FIG. 1O is a schematic view of operation of the pump system
shown in FIG. 1A when the electrically activated pump and the
mechanically activated pump are in operation.
[0040] FIG. 1P is a schematic view of operation of the pump system
shown in FIG. 1A when only the mechanically activated pump is in
operation.
[0041] FIG. 2A is a side perspective view of a second example pump
system for a prosthetic device.
[0042] FIG. 2B is a side view of the pump system shown in FIG.
2A
[0043] FIG. 2C is a lower rear perspective view of the pump system
shown in FIG. 2A.
[0044] FIG. 2D is an upper front perspective view of the pump
system shown in FIG. 2A.
[0045] FIG. 2E is an upper front perspective partially exploded
view of the pump system shown in FIG. 2A.
[0046] FIG. 2F is an alternative view of that shown in FIG. 2E,
showing view of a layout of major components within the
electrically activated pump of the pump system shown in FIG.
2E.
[0047] FIG. 3A is an upper perspective view of a third pump system
for a prosthetic device.
[0048] FIG. 3B is a front view of the pump system shown in FIG.
3A.
[0049] FIG. 3C is a side view of the pump system shown in FIG.
3A.
[0050] FIG. 3D is an upper front perspective partially exploded
view of the pump system shown in FIG. 3A.
[0051] FIG. 3E is a simplified upper perspective view of a layout
of major components within the electrically activated pump of the
pump system shown in FIG. 3A.
[0052] FIG. 4A is a simplified side view of a prosthetic device in
the form of a prosthetic limb for a transfemoral amputee having a
fourth example pump system that includes a mechanically activated
pump.
[0053] FIG. 4B is a simplified side view of a prosthetic device in
the form of a prosthetic limb for a transtibial amputee having the
pump system shown in FIG. 4A.
[0054] FIG. 4C is a rear view of the pump system shown in FIG.
4A.
[0055] FIG. 4D is a side view of the pump system shown in FIG.
4A.
[0056] FIG. 4E is an upper perspective view of the pump system
shown in FIG. 4A.
[0057] FIG. 4F is a lower perspective view of the pump system shown
in FIG. 4A.
[0058] FIG. 4G is a lower rear perspective partially exploded view
of the pump system shown in FIG. 4A.
[0059] FIG. 4H is a simplified upper perspective view of an upper
compression member of the pump system shown in FIG. 4A and further
including an electrically activated pump that is shown with a
layout of the major components.
[0060] It should be understood that the drawings are not to scale.
While some details of a pump system for a prosthetic device,
including details of fastening means and other plan and section
views of the particular components, have not been included, such
details are considered well within the comprehension of those of
skill in the art in light of the present disclosure. It also should
be understood that the present invention is not limited to the
example embodiments illustrated.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0061] Referring generally to FIGS. 1A-4H, it will be appreciated
that a vacuum pump system for use in suspension of a prosthetic
device from a residual limb of the present disclosure generally may
be embodied within numerous configurations of pump systems having a
mechanically activated pump and/or a hybrid pump system having a
mechanically activated pump and an electrically activated pump.
Indeed, while acknowledging that all of the example configurations
may include at least one of the example mechanically activated
pumps, it is contemplated that a pump system may be incorporated
into various prosthetic devices, such as transfemoral and
transtibial prosthetic limbs.
[0062] FIG. 1A shows a simplified side view of a prosthetic device
or limb 2 in the form of a prosthetic limb for a transfemoral
amputee. The prosthetic device 2 generally includes a socket 4, a
first example pump system 6, a knee joint 8, a pylon 10 and a
prosthetic foot 12. The socket 4 has an upper end 18 that is open
and is adapted to receive a transfemoral residual limb, with a
lower end 20 that includes a port (not shown) in fluid
communication with the pump system 6.
[0063] FIG. 1B incorporates somewhat similar components in showing
a simplified side view of a prosthetic device or limb 2' in the
form of a prosthetic limb for a transtibial amputee. The prosthetic
device 2' generally includes a socket 4', the first example pump
system 6, a pylon 10' and a prosthetic foot 12. The socket 4' has
an upper end 18' that is open and is adapted to receive a
transtibial residual limb, with a lower end 20' that includes a
port (not shown) in fluid communication with the pump system 6.
[0064] There are numerous configurations of socket assemblies for
suspension systems, some custom molded and constructed for direct
contact with the skin of the residual limb, while others are
intended to receive a residual limb that is covered with one or
more liner components that prevent the skin from direct contact
with the socket and exposure to vacuum pressure developed within
the socket. It will be appreciated that the pump systems of the
present disclosure could be configured for use in prosthetic
devices with either type of socket, whether for use with
transfemoral or transtibial residual limbs, with the components and
specifications being appropriately matched to the desired vacuum
pressure. Indeed, the specific construction and shape of the socket
are not at issue, and depending on the particular configuration
used, the port may be placed at various locations within the
socket.
[0065] Although shown in simplified form, it will be understood
that within a prosthetic device 2, 2', the lower end 20, 20' of the
socket 4, 4' will include a mounting flange and associated
fasteners, or other connective elements, for connection to the pump
system 6 or to other intermediary components. Similarly, the upper
end of the knee joint 8 or pylon 10' will be equipped for
connection to the pump system 6, such as by having a mounting
flange for a standard pyramid four bolt connector. It will be
appreciated that the low profile, inline structure of the pump
system 6 may be incorporated into a reduced package height,
preferably although not necessarily of about 1.5 inches or less,
which permits fluid connection of the pump system 6 to the lower
end 20, 20' of the socket 4, 4', and may eliminate the need for
external tubing. Avoiding the use of external tubing can reduce the
likelihood of interference or impedance of flexion of the knee, or
the risk of getting caught on a protrusion.
[0066] A pump system 6 consistent with the first example may be
seen in various views within FIGS. 1C-1L and includes at least a
mechanically activated pump 30. As shown, the first example also
includes an electrically activated pump 70, and the mechanically
activated pump 30 and electrically activated pump 70 are connected
within a fluid circuit 90 that is connected to and adapted to
evacuate air from the socket 4, 4', thereby forming a particularly
advantageous modular, hybrid pump system 6. The evacuation of air
from the socket 4, 4', provides vacuum engagement between the
prosthetic device 2, 2' and a respective transfemoral or
transtibial residual limb. It also will be appreciated that with a
pump system that includes a mechanically activated pump 30, the
pump system alternatively could be configured for periodic use with
a separate hand operated pump to establish initial air
evacuation.
[0067] The hybrid pump system 6 of this first example provides a
compact, low profile, inline structure. As may be seen in FIGS.
1C-1F and 1I-1L, the mechanically activated pump 30 of the first
example pump system 6 includes a first compression member 32
coupled to a second compression member 34, with a compressible
bladder 36 is disposed therebetween. The first and second
compression members 32, 34 preferably are constructed of relatively
light weight, generally rigid, suitable metals, such as aluminum
alloys, titanium alloys, stainless steels or superalloys, or
various plastics or composite materials. Depending on the
environment to which a prosthetic device may be subjected, it may
be desirable for the materials to be waterproof, sand-proof, and
weather and corrosion resistant, although an outer pump system
cover also may be employed to reduce the likelihood of intrusion of
fluids or foreign matter.
[0068] The first compression member 32 includes a generally planar
central body 38 having a central recess 40, spaced apart mounting
apertures 42, and extensions in the form of hinge knuckles 44 that
are opposite a flange 46. The mounting apertures 42 are configured
to permit fasteners to pass therethrough for mounting to a standard
pyramid four bolt connector at the upper end of a knee joint 8 or
pylon 10', but it will be appreciated that alternative connective
elements could be integrally formed into the first compression
member for this or the other examples. The second compression
member 34 includes a generally planar central body 48 having a
central aperture 50, spaced apart mounting apertures 52, and an
extension in the form of a hinge knuckle 54 that is opposite a
flange 56. The first compression member 32 is coupled to the second
compression member 34 via coupling elements that include a the
hinge knuckles 44, 54 and a hinge pin 58 that pivotally engages the
respective knuckles 44, 54, thereby making the first compression
member 32 pivotally coupled to the second compression member 34. An
optional spring assembly 60 extends between the respective flanges
46, 56 and biases the flanges toward a spaced apart position. Use
of the spring assembly 60 may assist in providing consistent
operation and feedback to the user.
[0069] While the coupling elements may be of a different
configuration and size, the mechanically activated pump 30 should
provide sufficient structural integrity and stability to maintain a
consistent and predictable gait and resistance to torsional inputs,
such as a twisting motion after planting a step. Also, it will be
appreciated that the hinge or pivotal coupling is shown on the
anterior or front side of the pump. While the hinge could be placed
anteriorly or posteriorly, depending on the preference of
particular prosthetists, placement anteriorly should cause the
bladder to compress upon heel contact, providing some shock
absorption, and movement of the pivots should mimic a desirable
stance phase knee flexion.
[0070] The compressible bladder 36 may be particularly effective,
while being of relatively short height because it has nearly
continuous generally planar upper and lower surfaces 36', 36'',
which are connected to a radially bulging outer sidewall 36''' that
defines an outer perimeter of the compressible bladder 36. This
configuration of the compressible bladder 36 permits much greater
capacity, and therefore potential efficiency, within a given
overall diameter, when compared to a compressible bladder having an
enlarged passage through the center to accommodate a tubular
pylon-like telescopic structure. Locating the pump system 6 above
the knee in a transfemoral configuration may permit a relatively
large overall diameter, such as around 4 inches.
[0071] The compressible bladder 36 generally is an airtight,
elastomeric body, and depending on the extent of the desired
inherent rebound within the structure, and the anticipated
environmental conditions, may be constructed of various rubbers,
such as plasticized Halobutyl or polysulphide rubbers, plastics,
such as ABS, PEEK or other polymers, Nylon, composites or other
suitable materials. Also, depending on the selected material, the
compressible bladder may be constructed by blow molding or other
suitable manufacturing techniques.
[0072] While the compressible bladder 36 may be constructed of one
or more materials and in a manner that will tend to expand or
return to its original non-compressed state, thereby separating the
first and second compression members 32, 34, the optional spring
assembly 60 is intended to ensure rebound and expansion of the
compressible bladder 36 during repeated hinged compression
movements that occur during walking or isolated bouncing-type
movements. Also, it will be appreciated that many configurations of
compression members, compressible bladders and coupling elements
may be utilized to couple a first compressible member to a second
compressible member, and optional spring assemblies may include
alternative spring forms, including for example, a leaf spring, or
a coiled torsion spring having opposed arms and being incorporated
with a hinge pin, or other suitable alternative structures.
[0073] The first and second compression members 32, 34 and
compressible bladder 36 utilize a fluid circuit 90 to evacuate air
from the socket 4, 4'. The compressible bladder 36 includes an
intake valve 62 that communicates through the aperture 50 in the
second compression member 34, and an output valve 64 that is vented
to the atmosphere to expel air that has been evacuated from the
socket 4, 4' by the pump system 6.
[0074] In the first example, the electrically activated pump 70 is
positioned inline with and connected to the second compression
member 34 of the mechanically activated pump 30. As may be seen in
a simplified manner in FIGS. 1L and 1J, the electrically activated
pump 70 includes a housing 72 having an inlet valve 74 in
communication with a central passage 76 therethrough for fluid
connection to the socket 4, 4', and an output valve 78 that is
vented to the atmosphere to expel air that has been evacuated from
the socket 4, 4' by the pump system 6. The housing 72 also includes
passages 80 therethrough that are aligned with the mounting
apertures 52 in the second compression member 34 and together
receive fasteners (not shown) that provide mechanical connection of
the mechanically activated pump 30 and electrically activated pump
70 to a suitable mounting flange (not shown) at the lower end 20,
20' of a socket 4, 4'. It will be appreciated that the electrically
activated pump may be equipped with alternative valving and
operative features, as desired. Also, the housing of the
electrically activated pump could be configured to be integrated
into the lower end of a socket.
[0075] As may be appreciated in FIGS. 1G, 1H and 1N, the electrical
components of the electrically activated pump 70 are shown in a
simple layout and with a functional schematic to show the basic
function and connection configuration. It will be appreciated that
the components may be configured and connected in fluid
communication by conventional means, such as by suitable tubing,
and/or may be configured and connected electrically by conventional
means, such as by suitable wires, leads or other circuitry, so as
to meet the needs and satisfy the design specifications and
constraints within of a particular implementation. In this first
example, within the housing 72 of the electrically activated pump
70 is a microcontroller M that includes a circuit board and is
connected to a motorized pump MP, a pressure sensor PS, and a
battery BAT. A user interface A, in the form of an on/off button,
is located in conjunction with the output valve 78 and is connected
to the microcontroller M. An optional serial data port D may be
utilized to interact with the microcontroller M, such as to track
and record the operating conditions of the pump system 6, for
diagnostic and historical monitoring purposes.
[0076] A further user interface B, such as in the form of a
wireless remote control device, a personal data assistant device, a
laptop or tablet computer, a cell phone or other wireless
apparatus, may be utilized to interact with the microcontroller M
to input particular settings that are associated with performance
parameters, such as the minimum and maximum vacuum pressures
between which the system will operate, the battery charge level at
which a warning light or alarm may be emitted, or to adjust other
parameters that would be desirable to control. The user interface B
also may be used to display information associated with the present
status of the system, such as the current vacuum pressure level,
battery charge level, or predictive information, such as the
battery life remaining or time interval until the next regular
maintenance is recommended. The pump system 6 may include warning
lights or alarms that may be connected to the housing 72, or
embodied within a user interface B, to alert a user to important
information.
[0077] The battery BAT preferably is rechargeable, such as by
direct or indirect connection to a power charge device PC. It
further is desirable that the battery BAT be replaceable, so as to
permit one or more spare, charged batteries to be utilized during
periods of extended use away from a power recharging source. It
will be appreciated that the battery BAT may simply be of a
disposable type, or that there could be an interface to permit
interchangeability between a rechargeable battery and a disposable
battery, based on the convenience and circumstances faced by the
user.
[0078] It will be appreciated that the pump system 6 presents a
hybrid, modular system that can be utilized in a number of ways. A
high level schematic is provided in FIG. 1M to show that when the
residual limb of a user has been received in a socket 4, 4', the
user is faced with an input that essentially could be considered an
unevacuated chamber. The user then may take one of two actions,
namely, first to press a button, such as user interface button A on
the housing 72, or on a user interface B, such as a remote control,
to provide electrical power to engage the electrically activated
pump 70, or second to step with the prosthetic limb 2, 2' to
provide mechanical power to the mechanically activated pump 30. The
two different actions both cause the pump system 6 to provide a
response by which air is expelled to the atmosphere, resulting in
an outcome by which the chamber between the socket 4, 4' and the
residual limb changes to an evacuated chamber.
[0079] Thus, the mechanically activated pump 30 or the electrically
activated pump 70 may be used to evacuate air from the socket 4,
4', with the understanding that either pump may be used
exclusively, if need be. However, maximum comfort and convenience
can be achieved by first utilizing the electrically activated pump
70 to establish rapid initial evacuation, and thereafter the user
may rely on the mechanically activated pump 30, if the user is
actively moving, such as walking, running or able to impose at
least a bouncing motion on the prosthetic limb 2, 2', or if the
user happens to be inactive at a time when further evacuation of
air is needed, the monitoring system within the electrically
activated pump 70 may automatically engage the motorized pump MP to
reestablish an acceptable vacuum pressure.
[0080] FIG. 1O provides a schematic representation of the pump
system 6 when a user is walking and the pump system 6 is within an
electrical pump-vacuum control range. Thus, within a swing phase,
the first and second compressible members 32, 34 move away from
each other, allowing the compressible bladder 36 to expand and draw
air from the socket 4, 4'. Meanwhile, the electrically activated
pump 70 may draw air from the socket 4, 4' and expel the air to the
atmosphere through the output valve 78. Within the stance phase,
the compression member 32 pivots relative to the compression member
34 to compress the compressible bladder 36, expelling the air
previously withdrawn from the socket 4, 4', while the electrically
activated pump 70 is able to continue to operate in the same manner
as during the swing phase.
[0081] FIG. 1P provides a schematic representation of the pump
system 6 when a user is walking and the pump system 6 is outside of
an electrical pump-vacuum control range. While the schematic
represents portions of the fluid circuit 90 as elongated lines, it
will be appreciated that the connections between components may be
direct, or may be by tubing, and that tubing could be used in a
configuration of a prosthetic device having a socket 4 for a
transfemoral residual limb, with a pump system 6 positioned below
the knee joint. Within the swing phase shown in FIG. 1P, the first
and second compressible members 32, 34 again move away from each
other, allowing the compressible bladder 36 to expand and draw air
from the socket 4, 4'. Meanwhile, the electrically activated pump
70 is not energized, to save battery charge. Within the stance
phase, the compression member 32 pivots relative to the compression
member 34 to compress the compressible bladder 36, expelling the
air previously withdrawn from the socket 4, 4'.
[0082] From the foregoing description, it will be appreciated that
a method of suspending a prosthetic device 2, 2' from a residual
limb is provided herein. The method includes providing a prosthetic
device 2, 2' having a socket 4, 4' that receives the residual limb.
The method further includes providing a mechanically activated pump
30 having a first compression member 32 coupled to a second
compression member 34, a compressible bladder 36 disposed between
the first and second compression members 32, 34. The coupling
elements include the hinge knuckles 44, 54 and the hinge pin 58
which engages and couples together the first and second compression
members 32, 34, wherein all of the coupling elements are disposed
about an outer perimeter that is defined by the sidewall 36''' of
the compressible bladder 36, such that the coupling elements are at
or beyond the outer perimeter of the compressible bladder 36. The
method also includes providing a fluid circuit 90 in communication
with the socket 4, 4' and the compressible bladder 36, the fluid
circuit 90 being configured to evacuate air from the socket 4, 4'
when operating the mechanically activated pump 30. Operation of the
mechanically activated pump 30 occurs when the prosthetic device 2,
2' is used to walk.
[0083] Turning to FIGS. 2A-2F, a second example pump system 106 is
disclosed for use in a prosthetic device, such as the prosthetic
devices 2, 2'. The pump system 106 is quite similar to the first
example pump system 6, but varies somewhat in the mechanically
activated pump 130 that replaces the mechanically activated pump
30. However, the second example pump system 106 also includes at
least a mechanically activated pump 130, and is equipped with an
electrically activated pump 70. The mechanically activated pump 130
and electrically activated pump 70 are connected within a fluid
circuit that is similar to the fluid circuit 90 and is connected to
and adapted to evacuate air from the socket 4, 4', thereby forming
a particularly advantageous hybrid pump system 106. The evacuation
of air from the socket 4, 4', provides vacuum engagement between
the prosthetic device 2, 2' and a respective transfemoral or
transtibial residual limb.
[0084] The hybrid pump system 106 similarly provides a compact, low
profile, inline structure, where the mechanically activated pump
130 includes a first compression member 132 coupled to a second
compression member 134, which preferably are constructed of
materials similar to those mentioned with respect to the first
example pump system 6. A compressible bladder 136 is disposed
between the first and second compression members 132, 134.
[0085] The first compression member 132 includes a generally planar
central body 138 having a central recess 140, spaced apart mounting
apertures 142, and extensions in the form of hinge knuckles 144
that are opposite a flange 146. The second compression member 134
includes a generally planar central body 148 having a central
aperture 150, spaced apart mounting apertures 152, and an extension
in the form of a hinge knuckle 154 that is opposite a flange 156.
The first compression member 132 is coupled to the second
compression member 134 via coupling elements that include a the
hinge knuckles 144, 154 and a hinge pin 158 that pivotally engages
the respective knuckles 144, 154, thereby making the first
compression member 132 pivotally coupled to the second compression
member 134. An optional strap 159 is connected, such as by rivets,
screws or other fasteners, to the respective flanges 146, 156,
extends between them and limits the pivotal travel of the first
compression member 132 relative to the second compression member
134. In this second example pump system 106, an optional spring
assembly 160 extends through a central opening 176 in the
compressible bladder 136 between and biases the respective bodies
138, 148 toward a spaced apart position. It will be appreciated
that the optional spring assembly 160 also would not be needed if
the strap 159 alternatively incorporated a spring element.
[0086] The compressible bladder 136 may be particularly effective,
while being of relatively short height because it has nearly
continuous generally planar upper and lower surfaces 136', 136'',
which are connected to a radially bulging outer sidewall 136'''
that defines an outer perimeter of the compressible bladder 136. As
with the first example pump system 6, the coupling elements of the
second pump system 106 are disposed about the outer perimeter of
the compressible bladder 136. This configuration of the
compressible bladder 136 permits much greater capacity within a
given overall diameter, when compared to a compressible bladder
having an enlarged passage through the center to accommodate a
tubular pylon-like telescopic structure. The compressible bladder
136 generally is elastomeric and may be constructed of materials
similar to those mentioned above with respect to the first example
pump system 6.
[0087] While the compressible bladder 136 may be constructed of one
or more materials and in a manner that will tend to expand to a
non-compressed state, thereby separating the first and second
compression members 132, 134, the optional spring assembly 160 is
intended to ensure rebound and expansion of the compressible
bladder 136 during repeated hinged compression movements that occur
during walking or isolated bouncing-type movements. Also, it will
be appreciated that many configurations of compression members,
compressible bladders and coupling elements may be utilized to
couple a first compressible member to a second compressible member,
and optional spring assemblies may include alternative spring
forms, such as are mentioned above with respect to the first
example pump system 6.
[0088] The first and second compression members 132, 134 and
compressible bladder 136 utilize a fluid circuit 190 to evacuate
air from the socket 4, 4'. The fluid circuit 190 is similar to the
fluid circuit 90 of the first example pump system 6, but the
compressible bladder 136 incorporates an intake valve (not shown)
that communicates through the aperture 150 in the second
compression member 134, and an output valve (not shown) that is
vented to the atmosphere to expel air that has been evacuated from
the socket 4, 4' by the pump system 106.
[0089] In the second example, the electrically activated pump 70 is
positioned inline with and connected to the second compression
member 134 of the mechanically activated pump 130. As shown in a
simplified manner, the electrically activated pump 70 is
essentially the same as that shown in the first example pump system
6 and operates in the same way. The housing 72 of the electrically
activated pump 70 includes passages 80 therethrough that are
aligned with the mounting apertures 152 in the second compression
member 134 and together receive fasteners (not shown) that provide
mechanical connection of the mechanically activated pump 130 and
electrically activated pump 70 to a suitable mounting flange (not
shown) at the lower end 20, 20' of a socket 4, 4'.
[0090] As may be best appreciated in FIG. 2F, the electrical
components of the electrically activated pump 70 are shown in a
simple layout, and it will be appreciated that the components may
be configured and connected in a manner similar to that discussed
above with respect to the first example pump system 6. The pump
system 106 also may utilize similar user interfaces, operations and
methods of use to those described above with respect to the
schematic diagrams provided for the first example pump system
6.
[0091] Turning to FIGS. 3A-3E, a third example pump system 206 is
disclosed for use in a prosthetic device, such as the prosthetic
devices 2, 2'. The pump system 206 is somewhat similar to the
second example pump system 106, but varies in the mechanically
activated pump 230 that replaces the mechanically activated pump
130. However, the third example pump system 206 also includes at
least a mechanically activated pump 230, and is equipped with an
electrically activated pump 70 that is similar to that used in the
first example pump system 6. The mechanically activated pump 230
and electrically activated pump 70 are connected within a fluid
circuit that is similar to the fluid circuit 90 and is connected to
and adapted to evacuate air from the socket 4, 4', thereby forming
a particularly advantageous hybrid pump system 206. The evacuation
of air from the socket 4, 4', provides vacuum engagement between
the prosthetic device 2, 2' and a respective transfemoral or
transtibial residual limb.
[0092] The hybrid pump system 206 similarly provides a compact, low
profile, inline structure, where the mechanically activated pump
230 includes a first compression member 232 coupled to a second
compression member 234, which preferably are constructed of
materials similar to those mentioned with respect to the first
example pump system 6. A compressible bladder 236 is disposed
between the first and second compression members 232, 234.
[0093] The first compression member 232 includes a generally planar
central body 238 having a central recess (not shown), spaced apart
mounting apertures 242, and an extension 244 that is generally
perpendicular to the central body 238 and has a pair of parallel
bores 246 extending therethrough. The second compression member 234
includes a generally planar central body 248 having a central
aperture 250, spaced apart mounting apertures 252, and an extension
254 that is generally perpendicular to the central body 248 and has
a pair of parallel bores 256 extending therethrough. The respective
pairs of parallel bores 246, 256 are parallel to each other and
each bore is aligned with a further bore 255 through an end of a
respective parallel upper or lower link 257. Pairs of pivot pins
258 are received by the respective pairs of bores 246, 256 in the
first and second compression members 232, 234, and are pivotally
connected to the bores 255 at the ends of the links 257.
[0094] The parallel links 257 permit the first and second
compression members 232, 234 to be pivotally coupled to each other,
but form a four bar linkage that also causes the first compression
member 232 to translate toward and away from the second compression
member 234, while maintaining a relative parallel orientation of
the generally planar central bodies 238, 248. This compact, low
profile configuration presents a further alternative that may
utilize the same shorter height, yet higher capacity compressible
bladder 136 that is used in the second example pump system 106.
Accordingly, the compressible bladder 136 is disposed between the
first and second compression members 232, 234, and utilizes an
optional spring assembly 160 that extends through a central opening
176 in the compressible bladder 136 and assists in biasing the
respective central bodies 238, 248 toward a spaced apart position.
It will be appreciated that the coupling elements include the
extensions 244, 254, the pivot pins 258 and the links 257.
[0095] The compressible bladder 136 may be particularly effective,
while being of relatively short height because it has nearly
continuous generally planar upper and lower surfaces 136', 136'',
which are connected to a radially bulging outer sidewall 136'''
that defines an outer perimeter of the compressible bladder 136. In
this configuration, as with the prior examples, the coupling
elements are disposed generally outside of or about the outer
perimeter of the compressible bladder 136. This permits much
greater capacity within a given overall diameter, when compared to
a compressible bladder having an enlarged passage through the
center to accommodate a tubular pylon-like telescopic structure.
The compressible bladder 136 generally is elastomeric and may be
constructed of materials similar to those mentioned above with
respect to the first example pump system 6. The first and second
compression members 232, 234 and compressible bladder 136 utilize a
fluid circuit that is the same as the fluid circuit 190 in the
second example pump system to evacuate air from the socket 4,
4'.
[0096] While the compressible bladder 136 may be constructed of one
or more materials and in a manner that will tend to expand to a
non-compressed state, thereby separating the first and second
compression members 232, 234, the optional spring assembly 160 is
intended to ensure rebound and expansion of the compressible
bladder 136 during repeated hinged compression movements that occur
during walking or isolated bouncing-type movements. Also, it will
be appreciated that many configurations of compression members,
compressible bladders and coupling elements may be utilized to
couple a first compressible member to a second compressible member,
and optional spring assemblies may include alternative spring
forms, such as are mentioned above with respect to the first
example pump system 6.
[0097] In the third example, the electrically activated pump 70 is
positioned inline with and connected to the second compression
member 234 of the mechanically activated pump 230. As shown in a
simplified manner, the electrically activated pump 70 is
essentially the same as that shown in the first and second example
pump systems 6, 106 and operates in the same way. The housing 72 of
the electrically activated pump 70 includes passages 80
therethrough that are aligned with the mounting apertures 252 in
the second compression member 234 and together receive fasteners
(not shown) that provide mechanical connection of the mechanically
activated pump 230 and electrically activated pump 70 to a suitable
mounting flange (not shown) at the lower end 20, 20' of a socket 4,
4'.
[0098] A simple schematic representation of the layout of the
electrical components of the electrically activated pump 70 was
previously provided with respect to the first example pump system
6, but is included again for convenience in FIG. 3E. Accordingly,
it will be appreciated that the components of the third example
pump system 206 may be configured and connected in a manner similar
to that discussed above with respect to the first example pump
system 6. The pump system 206 also may utilize similar user
interfaces, operations and methods of use to those described above
with respect to the schematic diagrams provided for the first
example pump system 6. It further will be appreciated that the
linkage and first and second compression members 232, 234 that
provide parallel relative displacement, with a compressible bladder
136 therebetween, may achieve advantages over pumps utilized in
other contexts and configurations.
[0099] Turning to FIGS. 4A-4H, a fourth example is provided, with
the example initially including only a mechanically activated pump
in FIGS. 4A-4G, and then in FIG. 4H showing further coupling to and
inclusion of an electrically activated pump to form a modular,
hybrid pump system.
[0100] FIG. 4A shows a simplified side view of a prosthetic device
or limb 302 in the form of a prosthetic limb for a transfemoral
amputee. The prosthetic device 302 generally includes a socket 4, a
fourth example pump system 306, a knee joint 8, a pylon 10 and a
prosthetic foot 12. The socket 4 has an upper end 18 that is open
and is adapted to receive a transfemoral residual limb, with a
lower end 20 that includes a port (not shown) in fluid
communication with the pump system 306. It will be appreciated that
aside from the pump system 306, the other components of the
prosthetic limb 302 are the same as those of the previously
described prosthetic limb 2.
[0101] FIG. 4B incorporates in a prosthetic device 302' the same
components as shown in the simplified side view of a prosthetic
device or limb 2', in the form of a prosthetic limb for a
transtibial amputee. The prosthetic device 302' generally includes
a socket 4', the fourth example pump system 306, a pylon 10' and a
prosthetic foot 12. The socket 4' has an upper end 18' that is open
and is adapted to receive a transtibial residual limb, with a lower
end 20' that includes a port (not shown) in fluid communication
with the pump system 306.
[0102] The disclosure provided previously relating to the sockets
4, 4' and other components of prosthetic devices apply to and will
not be repeated for this fourth example. Thus, though not shown in
the simplified drawings, it will be understood that the prosthetic
devices 302, 302' would include mounting flanges or other hardware
to accommodate mounting of the pump system 306 to the socket 4, 4'
and to the upper end of the knee joint 8 or pylon 10'.
Nevertheless, the fourth example prosthetic devices 302, 302' also
embody low profile, inline structures with a pump system 306 that
may be incorporated into a reduced package height, as discussed
with the other examples. This would permit fluid connection of the
pump system 306 to the lower end 20, 20' of the socket 4, 4', and
may eliminate the need for external tubing, having the advantages
of such previously noted with respect the first example.
[0103] A fourth example pump system 306 may be seen in various
views within FIGS. 4C-4H and includes at least a mechanically
activated pump 330. As shown in FIG. 4H, the fourth example also
may include an electrically activated pump 370. The mechanically
activated pump 330 and electrically activated pump 370 may be
connected within a fluid circuit 390, a portion of which is shown,
but which is connected to and adapted to evacuate air from the
socket 4, 4' in a similar manner to that shown in the first
example, thereby forming a particularly advantageous modular,
hybrid pump system. The evacuation of air from the socket 4, 4',
provides vacuum engagement between the prosthetic device 2, 2' and
a respective transfemoral or transtibial residual limb. It also
will be appreciated that with a pump system that includes a
mechanically activated pump 330, the pump system alternatively
could be configured for periodic use with a separate hand operated
pump to establish initial air evacuation.
[0104] The hybrid pump system of this fourth example provides a
compact, low profile, inline structure, and takes advantage of
space provided at the front of the knee. As may be seen in FIGS.
4C-4H, the mechanically activated pump 330 of the fourth example
pump system 306 includes a first compression member 332 coupled to
a second compression member 334, with the compressible bladder 36
of the first example being disposed therebetween. The first and
second compression members 332, 334 preferably are constructed of
relatively light weight, generally rigid materials, such as
discussed with respect to the first example.
[0105] The first compression member 332 includes a generally planar
central body 338 having a central recess (not shown), spaced apart
mounting apertures 342, and extensions 344 having bores 345
therethrough and being generally perpendicular to the central body
338. The second compression member 334 includes a generally planar
central body 348 having a central aperture 350, spaced apart
mounting apertures 352, and an extension in the form of a flange
354 that extends upward and forward from the central body 348. The
first compression member 332 is coupled to the second compression
member 334 via coupling elements that include four respective
fastener pins 356 that may be connected to the second compressible
member 334 at apertures 358, such as by press fit or other suitable
means of connection, and that slide within the bores 345 of the
extensions 344 of the first compression member 332. This coupling
configuration provides for translation of the second compression
member 334 relative to the first compression member 332. While the
coupling elements may be of a different configuration and size, the
mechanically activated pump 330 should provide sufficient
structural integrity and stability to maintain a consistent and
predictable gait and resistance to torsional inputs, such as a
twisting motion after planting a step. Optional springs 360 may be
placed around the extensions 344 and extend between and first and
second compression members 332, 334, tending to bias them toward a
spaced apart position. Use of the springs 360 may assist in
providing consistent operation and feedback to the user.
[0106] The compressible bladder 36 and its associated valving may
be particularly effective in this example, as well, in light of the
relatively short height, and nearly continuous generally planar
upper and lower surfaces that are connected to the radially bulging
outer sidewall 36'''. As with the prior examples, the outer
sidewall defines an outer perimeter of the compressible bladder 36
and such a configuration for a compressible bladder 36 may permit
greater capacity and potential efficiency, within a given overall
diameter, when compared to a compressible bladder having an
enlarged passage through the center to accommodate a tubular
pylon-like telescopic structure. This fourth example similarly has
all of the coupling elements disposed about an outer perimeter that
is defined by the sidewall 36''' of the compressible bladder 36,
such that the coupling elements are at or beyond the outer
perimeter of the compressible bladder 36. This permits a shorter
pump height and location of the pump system 306 above the knee in a
transfemoral configuration, which in turn, may permit a relatively
large overall diameter and capacity for the compressible
bladder.
[0107] As noted previously, the compressible bladder 36 may be
constructed of one or more materials and in a manner that will tend
to expand or return to its original non-compressed state, thereby
separating the first and second compression members 332, 334.
However, the optional springs 360 are intended to ensure rebound
and expansion of the compressible bladder 36 during repeated
telescopic compression movements that occur during walking or
isolated bouncing-type movements. Also, as previously noted, it
will be appreciated that many configurations of compression
members, compressible bladders and coupling elements may be
utilized to couple a first compressible member to a second
compressible member, and optional spring assemblies may include
alternative spring forms, including for example, a leaf spring, or
coiled torsion springs having opposed arms and being positions to
bias the first and second compression members 332, 334 to a spaced
apart position. Given the number of coupling elements and their
spaced arrangement, it is believed that a central, relatively long
and large tubular telescopic assembly need not be required, and
that the shorter, thinner fastener pins 356 sliding within the
bores 345 of the extensions 344 will provide for proper alignment
and smooth translational movement.
[0108] The first and second compression members 332, 334 and
compressible bladder 36 utilize a fluid circuit that would be
comparable to those previously described to evacuate air from the
socket 4, 4' of the prosthetic devices 302, 302'. As noted, the
compressible bladder 36 includes an intake valve, and it is able to
communicate through an aperture 350 in the second compression
member 334, and an output valve is vented to the atmosphere to
expel air that has been evacuated from the socket 4, 4' by the pump
system 306.
[0109] In the fourth example, the electrically activated pump 370
is positioned essentially above and forward of the knee joint 8 or
the pylon 10', connected to the flange 354 of the second
compression member 334 of the mechanically activated pump 330. As
may be seen in a simplified manner in FIG. 4H, the electrically
activated pump 370 includes a housing 372 having an inlet valve 374
in communication with the central aperture 350 of the second
compression member 334 for fluid connection to the socket 4, 4',
and an output valve (not shown) that is vented to the atmosphere to
expel air that has been evacuated from the socket 4, 4' by the pump
system 306. The housing 372 also includes mounting bores 378 that
receive fasteners (not shown) through passages 380 in the central
body 348 of the second compression member 334 to connect the
electrically activated pump 370 to the mechanically activated pump
330. It will be appreciated that the electrically activated pump
may be equipped with alternative valving and operative features, as
desired. Also, the housing of the electrically activated pump could
be configured to be connected to the mechanically activated pump in
an alternative manner, such as for example, in the stacked
arrangement shown in the first three examples, just as any of those
examples could have utilized a side mounting of their respective
electrically activated pumps, such as in the manner shown with the
fourth example or in an alternative configuration that places the
electrically activated pump outside of the outer perimeter of the
compressible bladder. It also will be appreciated that an
additional reduction in height may be achieved if the circuitry is
positioned along the outer perimeter of the first and/or second
compression member.
[0110] As may be appreciated in FIG. 4H, the electrical components
of the electrically activated pump 370 are shown in a simple layout
and it will be understood that they have similar basic functions
and connection configurations those described for the first example
pump system 6 and which also would apply to the other examples. It
will be appreciated that the components may be configured and
connected in fluid communication by conventional means, such as by
suitable tubing, and/or may be configured and connected
electrically by conventional means, such as by suitable wires,
leads or other circuitry, so as to meet the needs and satisfy the
design specifications and constraints within of a particular
implementation. In this fourth example, within the housing 372 of
the electrically activated pump 370 is a microcontroller M' that
includes a circuit board and is connected to a motorized pump MP',
a pressure sensor PS', and a battery BAT'. A user interface A', in
the form of an on/of button, is located along the top of the flange
354 and is connected to the microcontroller M'. An optional serial
data port D' may be utilized to interact with the microcontroller
M', such as to track and record the operating conditions of the
pump system 306, for diagnostic and historical monitoring
purposes.
[0111] As described with respect to the first example and would
apply to the other examples, a further user interface, such as in
the form of a wireless remote control device or other devices may
be utilized, as previously described. In addition, the battery BAT'
may be similar to that which was described previously for the other
examples.
[0112] It will be appreciated that, with inclusion of an
electrically activated pump 370, the pump system 306 may present a
hybrid, modular system that can be utilized in a number of ways to
evacuate air from a socket 4, 4'. Schematics provided for the first
example, as well as the associated description, may be referred to
and similarly apply to the means of operation and methods of use of
the fourth example pump system 306 to establish and maintain an
evacuated chamber in the socket 4, 4' of a prosthetic device 302,
302', whether the mechanically activated pump 330 is used alone, or
is paired with the electrically activated pump 370 to provide a
hybrid pump system.
[0113] It will be appreciated that a pump system for use in
suspension of a prosthetic device from a residual limb in
accordance with the present disclosure may be provided in various
configurations. Any variety of suitable materials of construction,
configurations, shapes and sizes for the components and methods of
connecting the components may be utilized to meet the particular
needs and requirements of an end user. It will be apparent to those
skilled in the art that various modifications can be made in the
design and construction of such pump systems without departing from
the scope or spirit of the claimed subject matter, and that the
claims are not limited to the preferred embodiments illustrated
herein.
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