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Artificial limb joint

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Publication number
US2556525A
US2556525A US12033649A US2556525A US 2556525 A US2556525 A US 2556525A US 12033649 A US12033649 A US 12033649A US 2556525 A US2556525 A US 2556525A
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Prior art keywords
spring
anchor
joint
foot
outer
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Expired - Lifetime
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William M Drennon
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William M Drennon
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • A61F2/6607Ankle joints
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5007Prostheses not implantable in the body having elastic means different from springs, e.g. including an elastomeric insert
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5072Prostheses not implantable in the body having spring elements
    • A61F2002/5073Helical springs, e.g. having at least one helical spring
    • A61F2002/5075Multiple spring systems including two or more helical springs
    • A61F2002/5076Concentric outer and inner helical springs
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • A61F2002/6614Feet
    • A61F2002/6657Feet having a plate-like or strip-like spring element, e.g. an energy-storing cantilever spring keel
    • A61F2002/6671C-shaped
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00Joints and connections
    • Y10T403/45Flexibly connected rigid members
    • Y10T403/459Helical spring type coupling

Description

June 12, 1951 w, DRENNQN 2,556,525

. ARTIFICIAL LIMB JOINT Filed 001;. 8, 1949 FIG.

YINVENTOR ATTORNEYS WILLIAM H. mm:

BY I 74% 6 Patented June 12, 1951 UNHTED STATES PATENT Q'FFICE ARTIFICIAL LIMB JOINT William M. Drennon, South Gate, Calif.

Application October 8, 1949, Serial No. 120,336

1 Claim.

This invention has to do with artificial limbs and has as an object the provision of an improved joint therefor. While my improved joint is particularly well suited as an ankle joint, it should be understood, of course, that I do not intend to confine its use as an ankle joint, since it is capable of providing a joint between any two relatively movable parts of an artificial limb or the like.

It is a further object of the invention to provide a joint which has flexibility approaching that of a human joint such as an ankle joint.

Another object is the provision of a joint of this character which is capable of affording maximum comfort and which is extremely durable.

A further characteristic and advantage of my invention is its simplicity and economy of manufacture.

Other objects will appear hereinafter.

Without intending thereby to limit the broader scope of my invention as defined by the appended claim, I shall now describe an embodiment thereof which I, at present, prefer, for which purpose I shall refer to the accompanying drawings, wherein:'

Fig. 1 is a view partly in section and partly in side elevation of a foot and leg joined together by my improved ankle joint; I

Fig. 2 is a section taken on line 22 of Fig. 1;

Fig. 3 is a top plan view of the outer spring element; and

Fig. 4 is a top plan view of the inner spring element.

In the drawings, I show a foot portion F and a leg portion L.

The foot portion is composed of an outer layer 5 of soft material, such as sponge rubber, and a core 6 of a relatively stiif material, such as vulcanized rubber, although it is my preference that the core possess some degree of flexibility.

Within the core I embed a spring steel anchor plate In which serves as a lower anchor or foundation for the ankle joint now to be described. The foot portion is provided with an upwardly opening socket l5 within which I mount a pair of nested, concentric spiral springs l7, I8, and atop the spring elements I provide a cup-shaped metallic anchor plate or member 2!] which extends into and is secured to the leg L. As best seen in Figs. 2-4, the upper end of the outer spring I8 is provided with a loop 22 which is secured to anchor member 20 as by a bolt 23, while the lower end of the outer spring terminates in a loop 25 secured to the anchor plate In as by bolt 26.

The upper end of the inner spring I! terminates in a loop 30 secured to the anchor member 20 by bolt 21, while the lower end of the inner spring terminates in a hook 32 secured to the anchor plate by bolt 33.

It will be observed that the top and bottom loops of the outer spring are anchored at diametrically opposite points, while the top and bottom loops of the inner spring are also anchored at diametrically opposite points. That is, the respective ends of the outer spring are anchored at points spaced 180 from each other, while the respective ends of the inner spring are also anchored at points spaced 180 from each other, and spaced from the respective anchor points of the outer spring. Thus, no matter in which direction the foot is tilted relative to the leg, the stress is communicated directly to one of the anchor points, while vertical loads are taken by the springs in compression.

While, for illustrative purposes only, a portion of the rubber is shown in Fig. 1, I prefer to embed the springs l1, H3 in that portion of the rubber core 6 which fills socket I5. Thus, the rubber to some extent shares the vertical loads with the springs and it also protects the springs from exposure and corrosion.

The sole means of anchoring the foot to the leg is through the attachment of the springs to the anchor members, although in practice the leg and foot may be provided with some sort of flexible sheathing (not shown) which might afford some degree of attachment.

From the foregoing it will be apparent that my joint permits both twisting and tilting of the foot relative to the leg, the joint is fully cushioned and it affords suflicient resistance to too free tilting and twisting of the limb.

I claim:

In an artificial limb having a foot portion and a leg portion, a leaf spring embedded in the foot portion, a top anchor member secured to the leg portion, and a pair of nested spiral springs interposed between said leaf spring and said top anchor member, the upper end of the outer spring being anchored to said top anchor member and thelower end of said outer spring being anchored to the leaf spring at a point spaced from the point at which the top end thereof is anchored to the top anchor member; and the respective ends of the inner spring being anchored to said top anchor member and said leaf spring, respectively, at points spaced, respectively, 90 from the said anchor points of the outer spring.

WILLIAM M. DRENNON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 117,733 Black Aug. 8, 1871 288,239 Ingram Nov. 13, 1883 2,453,969 Carter Nov. 16, 1948

US2556525A 1949-10-08 1949-10-08 Artificial limb joint Expired - Lifetime US2556525A (en)

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US2556525A US2556525A (en) 1949-10-08 1949-10-08 Artificial limb joint

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US2556525A true US2556525A (en) 1951-06-12

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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335428A (en) * 1964-11-02 1967-08-15 Goodrich Co B F Resilient prosthetic foot made from elastic polymers of different hardness
US3754286A (en) * 1972-01-21 1973-08-28 M Ryan Artificial foot having ankle flexible mount
DE2341887A1 (en) * 1973-08-18 1975-02-27 Ipos Gmbh & Co Kg Art foot for leg prostheses
US3920610A (en) * 1973-02-28 1975-11-18 Eugene Wagner Method of making and tailoring prosthetic feet
US4177525A (en) * 1977-11-09 1979-12-11 Ohio Willow Wood Co., Inc. Reinforced artificial foot and method of making
US4328594A (en) * 1980-02-13 1982-05-11 Campbell John W Prosthetic foot
US4395783A (en) * 1980-07-16 1983-08-02 Vessa Limited Method of making an artificial leg
US4442554A (en) * 1982-02-12 1984-04-17 Arthur Copes Biomechanical ankle device
EP0277175A1 (en) * 1986-07-28 1988-08-10 Ohio Willow Wood Inc Prosthetic foot.
FR2612768A1 (en) * 1987-03-26 1988-09-30 Lehn Phillips Van leg prosthesis and the foot modular composite material
FR2626463A1 (en) * 1988-01-28 1989-08-04 Espace Composites Sarl Frame device for foot prosthesis
FR2638087A1 (en) * 1988-10-21 1990-04-27 Proteor Sa Prosthesis for leg amputation and method for making
DE3918810A1 (en) * 1989-06-09 1990-12-13 Bock Orthopaed Ind Loser joint prosthesis foot
US5156632A (en) * 1990-11-29 1992-10-20 Otto Bock Orthopaedische Industrie Besitz- und Verwaltungs-Kommanditgesel lschaft Jointless prosthetic foot
US5258039A (en) * 1991-11-15 1993-11-02 The National University Of Singapore Energy storing composite prosthetic foot
FR2698538A1 (en) * 1992-11-27 1994-06-03 Proteor Sa Foot replacement prosthesis with internal energy storage springs - has pair of independently-reacting spring blades enclosed within elastic body of foot prosthesis, secured together below ankle recess
US5458656A (en) * 1991-09-30 1995-10-17 Flex-Foot Energy-storing prosthesis leg pylon vertical shock leg
US5486209A (en) * 1989-04-13 1996-01-23 Phillips; Van L. Foot prosthesis having auxiliary ankle construction
US5509938A (en) * 1991-02-28 1996-04-23 Phillips; Van L. Prosthetic foot incorporating adjustable bladder
US5514186A (en) * 1989-04-13 1996-05-07 Phillips; Van L. Attachment construction for prosthesis
US5514185A (en) * 1991-02-28 1996-05-07 Phillips; Van L. Split foot prosthesis
US5549714A (en) * 1990-09-21 1996-08-27 Phillips; Van L. Symes foot prosthesis
US5766265A (en) * 1985-08-01 1998-06-16 Phillips; Van L. Prosthetic foot having curved integral support
US5899944A (en) * 1991-02-28 1999-05-04 Phillips; Van L. Prosthetic foot incorporating compressible members
US5993488A (en) * 1994-08-15 1999-11-30 Phillips; Van L. Prosthesis with resilient ankle block
US6206934B1 (en) 1998-04-10 2001-03-27 Flex-Foot, Inc. Ankle block with spring inserts
US6406500B1 (en) 1989-04-13 2002-06-18 Van L. Phillips Foot prosthesis having curved forefoot
US6443995B1 (en) 2000-12-22 2002-09-03 Barry W. Townsend Prosthetic foot
US20030093158A1 (en) * 2000-10-26 2003-05-15 Phillips Van L. Foot prosthesis having cushioned ankle
US20040199265A1 (en) * 2000-12-22 2004-10-07 Townsend Barry W. Prosthetic foot
US20040225376A1 (en) * 2000-12-22 2004-11-11 Townsend Barry W. Prosthetic foot
US20050038525A1 (en) * 1999-05-24 2005-02-17 The Ohio Willow Wood Company Shock absorbing prosthetic foot for use with prosthetic ankle
US6899737B1 (en) 1998-04-10 2005-05-31 Van L. Phillips Foot prosthesis having cushioned ankle
US20050284160A1 (en) * 2004-06-25 2005-12-29 Johnson Controls Technology Company Method of and apparatus for evaluating the performance of a control system
US20080004719A1 (en) * 2006-07-03 2008-01-03 Sigurdur Asgeirsson Prosthetic foot
WO2008005424A2 (en) 2006-07-03 2008-01-10 Ossur Hf Prosthetic foot
US20100004757A1 (en) * 2008-07-01 2010-01-07 Ossur Hf Smooth rollover insole for prosthetic foot
US9351853B2 (en) 2008-08-18 2016-05-31 The Ohio Willow Wood Company Prosthetic foot
USD795433S1 (en) * 2015-06-30 2017-08-22 Össur Iceland Ehf Prosthetic foot cover

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US117733A (en) * 1871-08-08 Improvement in universal joints for shaft-couplings
US288239A (en) * 1883-11-13 George a
US2453969A (en) * 1947-04-03 1948-11-16 Edwin C Carter Artificial limb

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US117733A (en) * 1871-08-08 Improvement in universal joints for shaft-couplings
US288239A (en) * 1883-11-13 George a
US2453969A (en) * 1947-04-03 1948-11-16 Edwin C Carter Artificial limb

Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335428A (en) * 1964-11-02 1967-08-15 Goodrich Co B F Resilient prosthetic foot made from elastic polymers of different hardness
US3754286A (en) * 1972-01-21 1973-08-28 M Ryan Artificial foot having ankle flexible mount
US3920610A (en) * 1973-02-28 1975-11-18 Eugene Wagner Method of making and tailoring prosthetic feet
DE2341887A1 (en) * 1973-08-18 1975-02-27 Ipos Gmbh & Co Kg Art foot for leg prostheses
US4177525A (en) * 1977-11-09 1979-12-11 Ohio Willow Wood Co., Inc. Reinforced artificial foot and method of making
US4328594A (en) * 1980-02-13 1982-05-11 Campbell John W Prosthetic foot
US4395783A (en) * 1980-07-16 1983-08-02 Vessa Limited Method of making an artificial leg
US4442554A (en) * 1982-02-12 1984-04-17 Arthur Copes Biomechanical ankle device
US5766265A (en) * 1985-08-01 1998-06-16 Phillips; Van L. Prosthetic foot having curved integral support
EP0277175A1 (en) * 1986-07-28 1988-08-10 Ohio Willow Wood Inc Prosthetic foot.
EP0277175A4 (en) * 1986-07-28 1990-09-05 The Ohio Willow Wood Company, Inc. Prosthetic foot
FR2612768A1 (en) * 1987-03-26 1988-09-30 Lehn Phillips Van leg prosthesis and the foot modular composite material
FR2626463A1 (en) * 1988-01-28 1989-08-04 Espace Composites Sarl Frame device for foot prosthesis
FR2638087A1 (en) * 1988-10-21 1990-04-27 Proteor Sa Prosthesis for leg amputation and method for making
US5004477A (en) * 1988-10-21 1991-04-02 Establissements Proteor Prosthesis for leg amputation and a process for its manufacture
US6527811B1 (en) 1989-04-13 2003-03-04 Van L. Phillips Foot prosthesis with modular foot plate
US5486209A (en) * 1989-04-13 1996-01-23 Phillips; Van L. Foot prosthesis having auxiliary ankle construction
US5976191A (en) * 1989-04-13 1999-11-02 Phillips; Van L. Foot prosthesis having curved forefoot
US6406500B1 (en) 1989-04-13 2002-06-18 Van L. Phillips Foot prosthesis having curved forefoot
US5728176A (en) * 1989-04-13 1998-03-17 Flex-Foot, Inc. Attachment construction for prosthesis
US5514186A (en) * 1989-04-13 1996-05-07 Phillips; Van L. Attachment construction for prosthesis
US5593457A (en) * 1989-04-13 1997-01-14 Phillips; Van L. Foot prosthesis having auxiliary ankle construction
US5062859A (en) * 1989-06-09 1991-11-05 Otto Bock Orthopaedische Industrie Besitz- und Verwaltungs-Kommanditgesel lschaft Prosthetic foot having z shaped insert
DE3918810A1 (en) * 1989-06-09 1990-12-13 Bock Orthopaed Ind Loser joint prosthesis foot
US5549714A (en) * 1990-09-21 1996-08-27 Phillips; Van L. Symes foot prosthesis
US5156632A (en) * 1990-11-29 1992-10-20 Otto Bock Orthopaedische Industrie Besitz- und Verwaltungs-Kommanditgesel lschaft Jointless prosthetic foot
US5899944A (en) * 1991-02-28 1999-05-04 Phillips; Van L. Prosthetic foot incorporating compressible members
US5514185A (en) * 1991-02-28 1996-05-07 Phillips; Van L. Split foot prosthesis
US5509938A (en) * 1991-02-28 1996-04-23 Phillips; Van L. Prosthetic foot incorporating adjustable bladder
US5458656A (en) * 1991-09-30 1995-10-17 Flex-Foot Energy-storing prosthesis leg pylon vertical shock leg
US5258039A (en) * 1991-11-15 1993-11-02 The National University Of Singapore Energy storing composite prosthetic foot
FR2698538A1 (en) * 1992-11-27 1994-06-03 Proteor Sa Foot replacement prosthesis with internal energy storage springs - has pair of independently-reacting spring blades enclosed within elastic body of foot prosthesis, secured together below ankle recess
US7354456B2 (en) 1994-08-15 2008-04-08 Phillips Van L Foot prosthesis having cushioned ankle
US5993488A (en) * 1994-08-15 1999-11-30 Phillips; Van L. Prosthesis with resilient ankle block
US20050234563A1 (en) * 1994-08-15 2005-10-20 Phillips Van L Foot prosthesis having cushioned ankle
US6899737B1 (en) 1998-04-10 2005-05-31 Van L. Phillips Foot prosthesis having cushioned ankle
US20100106260A1 (en) * 1998-04-10 2010-04-29 Phillips Van L Foot prosthesis having cushioned ankle
US7279011B2 (en) 1998-04-10 2007-10-09 Phillips Van L Foot prosthesis having cushioned ankle
US20040162623A1 (en) * 1998-04-10 2004-08-19 Phillips Van L. Foot prosthesis having cushioned ankle
US7879110B2 (en) 1998-04-10 2011-02-01 Ossur Hf Foot prosthesis having cushioned ankle
US6206934B1 (en) 1998-04-10 2001-03-27 Flex-Foot, Inc. Ankle block with spring inserts
US6280479B1 (en) 1998-04-10 2001-08-28 Flex-Foot, Inc. Foot prosthesis having cushioned ankle
US20050038525A1 (en) * 1999-05-24 2005-02-17 The Ohio Willow Wood Company Shock absorbing prosthetic foot for use with prosthetic ankle
US7063727B2 (en) 2000-10-26 2006-06-20 Van L. Phillips Foot prosthesis having cushioned ankle
US20030093158A1 (en) * 2000-10-26 2003-05-15 Phillips Van L. Foot prosthesis having cushioned ankle
US6936074B2 (en) 2000-12-22 2005-08-30 Barry W. Townsend Prosthetic foot
US20040225376A1 (en) * 2000-12-22 2004-11-11 Townsend Barry W. Prosthetic foot
US20040199265A1 (en) * 2000-12-22 2004-10-07 Townsend Barry W. Prosthetic foot
US7108723B2 (en) 2000-12-22 2006-09-19 Townsend Barry W Prosthetic foot
US6743260B2 (en) 2000-12-22 2004-06-01 Barry W. Townsend Prosthetic foot
US6443995B1 (en) 2000-12-22 2002-09-03 Barry W. Townsend Prosthetic foot
US20050284160A1 (en) * 2004-06-25 2005-12-29 Johnson Controls Technology Company Method of and apparatus for evaluating the performance of a control system
WO2008005424A2 (en) 2006-07-03 2008-01-10 Ossur Hf Prosthetic foot
WO2008005424A3 (en) * 2006-07-03 2008-06-12 Ossur Hf Prosthetic foot
US20090043403A1 (en) * 2006-07-03 2009-02-12 Sigurdur Asgeirsson Prosthetic foot
US7503937B2 (en) * 2006-07-03 2009-03-17 Ossur Hf Prosthetic foot
US20080004719A1 (en) * 2006-07-03 2008-01-03 Sigurdur Asgeirsson Prosthetic foot
US8177855B2 (en) 2006-07-03 2012-05-15 Ossur Hf Prosthetic foot
US7771488B2 (en) 2006-07-03 2010-08-10 Ossur Hf Prosthetic foot
US20090030531A1 (en) * 2006-07-03 2009-01-29 Sigurdur Asgeirsson Prosthetic foot
US8685109B2 (en) * 2008-07-01 2014-04-01 össur hf Smooth rollover insole for prosthetic foot
US9168158B2 (en) 2008-07-01 2015-10-27 össur hf Smooth rollover insole for prosthetic foot
US20100004757A1 (en) * 2008-07-01 2010-01-07 Ossur Hf Smooth rollover insole for prosthetic foot
US9351853B2 (en) 2008-08-18 2016-05-31 The Ohio Willow Wood Company Prosthetic foot
USD795433S1 (en) * 2015-06-30 2017-08-22 Össur Iceland Ehf Prosthetic foot cover

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