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Artificial limb

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Publication number
US2692392A
US2692392A US21938651A US2692392A US 2692392 A US2692392 A US 2692392A US 21938651 A US21938651 A US 21938651A US 2692392 A US2692392 A US 2692392A
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Prior art keywords
foot
portion
block
member
metatarsal
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Expired - Lifetime
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Charles H Bennington
James N Tilley
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Modern Limb Supply Co Inc
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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

Description

Oct. 26, 1954 c. H. BENNINGTON ETAL 2,692,392

ARTIFICIAL LIMB Filed April 5, 1951 FIG. l.

Slwentor CHARLES H. BENN/NGTUN Mm n L L mf .0 E7 M Patented Oct. 26, 1954 UNITED STATS ATENT OFFICE ARTIFICIAL LIME Application April 5, 1951, Serial No. 219,386

7 Claims. l

This invention has to do with an artificial limb and in particular with an artificial limb having an ankle and foot capable of simulating many of the movements of a natural limb.

In normal walking the foot has at least six different movements: dorsal and plantar flexion, pronation and supination in the hind foot, and flexion in both directions of the metatarsals and toes in the forefoot. The problem of providing an artiicial limb capable of all these movements is an old one, and ball and socket joints, bearings, springs, connections of various resilient materials and many other suggestions have been made for simulating the natural movements. The commonest objections to prior artificial limbs have been their inability to perform in a manner comparable to a natural foot, and to stand up under the heavy wear and strain to which they are subjected.

An object of the present invention is to provide in an articial limb a rugged, simple connection between the parts representing the shin bone or tibia and the foot, permitting the foot to be moved in a manner closely resembling that of a natural foot. This object is attained by providing a block of resilient material having rigid plates embedded therein and flexibly connecting the tibia to the foot.

According to other features of the invention the metatarsal section is made flexible, and a heel cord is provided which can be readily adjusted to vary its tension.

rlihese and other features of the invention will be more fully described in connection with the drawings, in which:

Fig. l is a side elevation showing a limb according to the invention;

Fig. 2 is a side elevation of the limb partly in section; and

Fig. 3 is perspective of the pantala-r articulation according to the invention.

Referring to Fig. 2, a foot member lil is made from any suitable hard, relatively light material, such as wood. The anterior portion of the foot has two slots il and lia. Slot l is at a point in the foot corresponding to the break at the base of the metatarsal and slot lia corresponds to the break at the toe joint. Slot IIa is approximately 25% wider at its opening or top il than slot i I, thereby permitting the foot in walking to roll forward to approximate the natural fiexion at the respective joints. In an articial foot for the average male adult, slot II will be e across the opening and slot IIa wide. A cavity I3 in midtarsal section I4 and a cavity l in toe sec- 2 tion I'l register with a hollow portion metatarsal I2. An elongated resilient member I8, of rubber or the like, is loosely inserted in cavities I3 and I t and hollow portion I5. The portion of member I8 lying in metatarsal I2 has a con-cavity d8a to insure firm anchoring of rubber IS in cavities I3, I5 and l5 during walking. A pliable sole I9 recessed in the midtarsal section M and toe section il', is secured with the resilient member i8 to the midtarsal, metatarsal and toe sections lli, I2 and Il respectively by means of screws 2li or the like.

The pantalar articulation comprises a block ZI of resilient material, preferably natural or synthetic rubber, such as that used in first line automobile tires. While block 2l will here and in the claims be referred to as being made of rubber, it is understood that any other material having resilient characteristics such as rubber could be used. By pantalar is meant the joints and tissues surrounding the talus. The term pantalar articulation is used to describe an element which can be moved to simulate most of the movements of the talus and oscalcis. The resiliency of'rubbei' block 2| should be about the same throughout, but the resiliency of each block should preferably vary depending on the age, weight and activity of the wearer of the limb. For instance, in the case of a` normally active adult of 200 pounds for whom the limb being described will be considered, the block should have a durometer reading of 50.

Referring to Fig. 3, the upper surface of block 2l is V-shaped and consists of front portion 22 and rear portion 23 which slope towards the opposed lower horizontal surface. Preferably front portion 22 is slightly, about 12%, longer than. rear portion 23. By way of example some of the dimensions of block 2I are as follows:

(d) Narrowest distance between upper and lower` surfaces (e) Maximum distance between portion 22 and lower surface 115e- (f) Maximum distance between portion 23 andlower surface ha;

(g) Width at juncture of portions 22 and The angle which portions 22 and 23 (the legs of the V) make with one another is determined by the thickness of rubber required between the l5 in upper and lower surfaces of block 2|. This will vary as previously pointed out with the weight, age and activity of the wearer of the limb. However, in all cases it is desirable to keep this thickness to a minimum in order to insure that the pivoting point of the leg will be as close to the foot as possible as in the natural pantalar joints.

A thin plate 24, of the order of 116 thick, of metal or other rigid material, e. g. bronze, is bonded into block 2| just below and parallel to the surfaces of portions 22 and 23. Plate 24 is preferably one piece which has been bent to conform the V-shaped upper surface of the block.

Another plate 25, similar to plate 24, is bonded into block 2| just above and parallel to its flat lower surface. Two bolts 26 are brazed to plate 25 and project therefrom. Two bolts 21 are brazed to the front of plate 24 and project therefrom as do two other bolts 28 brazed to the rear of plate 24.

Bolts 25, 21 and 28, respectively, serve as the means for fastening block 2| to the foot and leg, and plates 24 and 25 the means for anchoring the bolts in the block. While other fastening and anchoring means are possible according to the invention, it is important that the connection between the leg and foot be secure yet not rigid.

The bonding of plates 24 and 25, with their respective bolts extending therefrom, into block 2| may be done in any one of a number of well known ways.

In the embodiment of the invention here illustrated, plate 24 is about 11g" in thickness and plate 25, g3g thick. Plate 25 is preferably made of slightly heavier stock than plate 24 because it is fastened to the foot by only two bolts 26, whereas plate 24 is fastened to the leg by four bolts 21, 28. While both plates are substantially co-extensive with their parallel block surfaces and are embedded in the block about M3 from the nearest outside surface, they could be at a greater or a lesser distance therefrom. The plates could also be merely bonded or otherwise fastened to the upper and lower surfaces of the block. The important point is to guard against thefplates being torn away from the block as a result of the heavy strain to which they are subjected during use of the artificial leg. Embedding them is one good way of preventing this.

The leg, tibia or shin bone is divided into a hollow upper portion 3| and a lower portion 32 which telescopes into portion 3|. By means of bolts 33 and flange 34 on upper portion 3| the position of lower portion 32 may be adjusted therein to vary the length of the leg depending on the requirements of the wearer. Base 35 of portion 32 is V-shaped to correspond to upper surfaces 22 and 23 of block 2|. It will be noted' that edge 36 of front portion 22 extends beyond base 35 because front portion 22 is slightly, about 12%, longer than rear portion 23. The reason for making front portion 22 longer than rear portion 23 is that in plantar exion the front of block 2| undergoes greater strain and must stretch more than in dorsal flexion, because in the latter the heel cord acts as a restraint.

Suitable holes to accommodate bolts 26 extend through foot lil and terminate in cut-out 31 in the bottom of foot l0. Nuts 38 may be screwed onto the ends of bolts 26 and work against a plate 39 to hold the block securely on the foot. Similarly, holes extending through base 35 permit bolts 21 and 28 to extend therethrough and the block is securely held to the lower portion of the tibia by nuts 40.

It will be appreciated that an important feature of block 2| is that it provides in a single, relatively inexpensive unit a pantalar articulation where heretofore a plurality of complicated parts was necessary. Furthermore, block 2| may be easily replaced with another block by the wearer if it becomes Worn or breaks.

A heel cord 42 is connected between a hook 43 formed on bracket 44 secured to the posterior of tibia portion 32 and an adjustable screw mechanism in the heel of the foot. The adjustable screw mechanism operates in a hole 45 extending through the bottom of heel 46 and contains an internally threaded flanged bushing 41 having holes 4B in its flanged end whereby bushing 41 may be turned by means of a Spanner wrench or key (not shown). Ends 49 of cord 42 are secured in an externally threaded ferrule 50 and held therein by an anchored pin 5| which rests against shoulder 52 in pipe 55. Threaded members 41 and 50 cooperate so that when member 41 is turned the tension on heel cord 42 will be varied. It is important that the wearer of the artificial limb can easily adjust the tension of the heel cord himself without recourse to others.

While I have shown cord 42 as made from fibrous material with a leather covering 53, it may be made from any other suitable inelastic material.

It will be appreciated that the metatarsal section, pantalar articulation and heel cord here described combine to provide an artificial limb whose foot portions mechanically simulate many of the movements of a natural foot. While any one of the three above described improvements may be incorporated individually in an artificial limb, the combination of all three of these constitutes an important feature of the invention.

Terms such as tibia, foot, heel, etc. used in the claims designate mechanical simulations which perform some of the functions of the natural members.

What is claimed is:

1. In an artificial foot, 'two slots of different widths in the front portion of said foot defining a metatarsal section, a hole through said metatarsal section and cavities registering therewith in the toe and midtarsal sections of the foot on either side of the metatarsal, and a p-iece of flexible material extending through said hole and cavities.

2. An artificial foot comprising a toe, a metatarsal and a midtarsal section, a first slot between said toe and metatarsal sections, a second slot narrower than said first slot between said metatarsal and midtarsal sections, a hole in said metatarsal registering with cavities in the toe and midtarsal sections, and a piece of flexible material extending through said hole and cavities whereby in walking the front portion of the foot simulates some of the movements of a natural foot.

3. In an artificial limb, a pantalar articulation connected between the tibia and the foot comprising a block of rubber having a V-shaped upper surface and a relatively fiat lower surface, the upper surface contacting the tibia member and divided into a front and a rear portion sloping towards the lower surface, the front portion being of the order of 12% longer than the rear portion, the lower surface of said block contacting the foot member, a first metal plate embedded in said block just below and parallel with the upper surface, a second metal plate embedded in the block just above and parallel with the lower surface, fastening means projecting from both said plates for fastening said block to the tibia and foot members, a heel cord connected between said tibia and the heel portion of said foot, and an adjustable screw in a hole in the bottom of the heel connecting said cord to the heel whereby the tension exerted by said cord may be Varied.

4. In an artificial limb, a leg member having an upper portion and a lower portion telescoping therein to adjust the length of said leg, a foot member, a pantalar articulation between said last two mentioned members comprising a block of automobile tire grade rubber having an upper surface contacting the lower leg member and divided into front and rear portions angularly disposed with respect to each other to resemble a V, said front portion being of the order of 12% longer than said rear portion and extending said amount free from said lower leg member when the upper surface of the block is in contact therewith, the lower surface of said block being substantially flat and contacting the foot member, a rst bronze plate embedded in said block just below and parallel with the upper surface, a second bronze plate embedded in the block just above and parallel with the lower surface, bolts extending from both of said plates for fastening said block to the leg and foot, a heel cord of relatively inelastic material connected between the lower rear portion of said leg and the heel of the foot, an adjustable screw mechanism in a hole in the bottom of the heel for connecting the cord to the heel whereby tension exerted by said cord may be varied, the front portion of said foot being divided by two slots into a metatarsal, a midtarsal and a toe section, the anterior of said slots being of the order of 25% wider at its top than Isaid posterior slot, a hollow portion extending through said metatarsal section and cavities corresponding therewith in said midtarsal and toe sections, a piece of rubber extending through said cavities and hollow portion and having a concavity in the portion in the metatarsal, and a sole of pliable material covering the bottom of said foot portions through which said piece of rubber extends.

5. An artificial foot comprising complementary toe, metatarsal and midtarsal sections having angular end faces disposed in spaced, end to end relation, each of said sections being recessed inwardly of its bottom face, a block of resilient material common to said sections disposed in said recesses in section spanning relation, a yieldable sole member recessed in said toe and midtarsal sections in overlying relation to said resilient material, and a plurality of screws securing said sole member and said block of resilient material to said toe, metatarsal and midtarsal sections.

6. The invention according to claim 5, and in which the surface juncture between said metatarsal section and said block of resilient material is at least in part concavo-convex.

7. In an artincial limb, the combination of a longitudinally adjustable leg member terminating in a il-shaped end portion, a foot member including a toe section and a metatarsal section yieldably connected thereto in spaced end to end relation, a pantalar connection between said V- shaped end portion and said foot member comprisms a block of resilient material having a horizontal bottom face and a complementary V- shaped upper face, a plurality of oppositely extending stud screws bonded in said block securing it to said V-shaped end portion and to said foot member, a rearwardly extending hook member secured to Said adjustable leg member, a shouldered, internally threaded bushing revolvably seated in the heel portion of said foot member ush therewith, and a looped cord having its free ends secured in an externally threaded ferrule adjustably connected to and between said hook member and said bushing.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 809,875 Wilkins Jan. 9, 1906 2,315,795 Johnson et al. Apr. 6, 1943 2,475,373 Catranis July 5, 1949 FOREIGN PATENTS Number Country Date 7,781 Great Britain Apr. 1, 1909 308,671 Germany Oct. 22, 1918 326,131 Germany Sept. 24, 1920 625,528 Great Britain June 29, 1949

US2692392A 1951-04-05 1951-04-05 Artificial limb Expired - Lifetime US2692392A (en)

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Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800333A (en) * 1971-01-07 1974-04-02 Friberg Ab K Artificial leg
US4204284A (en) * 1977-11-16 1980-05-27 Lord Corporation Joint prosthesis with contoured pin
US4229839A (en) * 1977-11-16 1980-10-28 Lord Corporation Joint prosthesis
US4231122A (en) * 1977-11-16 1980-11-04 Lord Corporation Knee joint prosthesis
DE3239959A1 (en) * 1982-10-28 1984-05-10 Heintz Bruno Ankle joint for leg prostheses
US4652266A (en) * 1986-03-07 1987-03-24 Kingsley Mfg. Co. Molded elastomeric prosthetic foot having energy-storing articulated keel
US4655778A (en) * 1985-08-12 1987-04-07 Harrington Arthritis Research Center Joint prosthesis
US5314499A (en) * 1991-04-04 1994-05-24 Collier Jr Milo S Artificial limb including a shin, ankle and foot
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
US5514185A (en) * 1991-02-28 1996-05-07 Phillips; Van L. Split foot prosthesis
US5514186A (en) * 1989-04-13 1996-05-07 Phillips; Van L. Attachment construction for prosthesis
US5545234A (en) * 1991-04-04 1996-08-13 Collier, Jr.; Milo S. Lower extremity prosthetic device
US5549714A (en) * 1990-09-21 1996-08-27 Phillips; Van L. Symes foot prosthesis
US5593455A (en) * 1994-05-27 1997-01-14 Phillips; Van L. Plug mounted prosthesis
US5728177A (en) * 1994-08-15 1998-03-17 Flex-Foot, Inc. Prosthesis with foam block ankle
US5826304A (en) * 1993-08-06 1998-10-27 Carlson; J. Martin Composite flexure unit
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
US20020087216A1 (en) * 1996-02-16 2002-07-04 Atkinson Stewart L. Prosthetic walking system
US6443995B1 (en) 2000-12-22 2002-09-03 Barry W. Townsend Prosthetic foot
DE10107838A1 (en) * 2001-02-16 2002-09-05 Goemed Orthopaedie Service Gmb Inner part of prosthetic foot, extending from heel to front, includes internal transverse incisions near rear of foot
US6478826B1 (en) 1998-04-10 2002-11-12 Van L. Phillips Shock module prosthesis
US6511512B2 (en) 1998-04-10 2003-01-28 Ossur Hf Active shock module prosthesis
US20030093158A1 (en) * 2000-10-26 2003-05-15 Phillips Van L. Foot prosthesis having cushioned ankle
US20050038524A1 (en) * 2003-08-15 2005-02-17 Jonsson Orn Ingvi Low profile prosthetic foot
US20050038525A1 (en) * 1999-05-24 2005-02-17 The Ohio Willow Wood Company Shock absorbing prosthetic foot for use with prosthetic ankle
US20050071017A1 (en) * 2003-09-30 2005-03-31 Lecomte Christophe Guy Low profile active shock module prosthesis
US6899737B1 (en) 1998-04-10 2005-05-31 Van L. Phillips Foot prosthesis having cushioned ankle
US6936074B2 (en) 2000-12-22 2005-08-30 Barry W. Townsend Prosthetic foot
US20050267603A1 (en) * 2004-05-28 2005-12-01 Lecomte Christophe G Foot prosthesis with resilient multi-axial 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
US20060058893A1 (en) * 2004-05-28 2006-03-16 Clausen Arinbjorn V Method of measuring the performance of a prosthetic foot
US7108723B2 (en) 2000-12-22 2006-09-19 Townsend Barry W Prosthetic foot
WO2005097008A3 (en) * 2004-04-01 2006-12-07 Byron K Claudino Prosthetic foot with tunable performance
US20090287314A1 (en) * 2008-05-13 2009-11-19 Rifkin Jerome R Joints for prosthetic, orthotic and/or robotic devices
US20100004757A1 (en) * 2008-07-01 2010-01-07 Ossur Hf Smooth rollover insole for prosthetic foot
US20100042228A1 (en) * 2008-08-18 2010-02-18 The Ohio Willow Wood Company Prosthetic foot
US20110015762A1 (en) * 2009-07-14 2011-01-20 Tensegrity Prosthetics Inc. Joints for prosthetic, orthotic and/or robotic devices
US20110208322A1 (en) * 2009-07-14 2011-08-25 Tensegrity Prosthetics Inc. Joints for Prosthetic, Orthotic and/or Robotic Devices
US20110208323A1 (en) * 2010-02-23 2011-08-25 Ossur Hf Metatarsal joint shape for prosthetic foot and control mechanism and system for same
US8486156B2 (en) 2010-02-26 2013-07-16 össur hf Prosthetic foot with a curved split
US8961618B2 (en) 2011-12-29 2015-02-24 össur hf Prosthetic foot with resilient heel
US9439786B2 (en) 2012-08-01 2016-09-13 össur hf Prosthetic ankle module
USD795433S1 (en) 2015-06-30 2017-08-22 Össur Iceland Ehf Prosthetic foot cover
USD797292S1 (en) 2014-06-30 2017-09-12 össur hf Prosthetic foot plate

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US809875A (en) * 1904-06-18 1906-01-09 George E Wilkins Artificial limb.
GB190907781A (en) * 1909-04-01 1910-03-03 Joseph Hancock Bradley A Novel or Improved Artificial Foot.
DE326131C (en) * 1919-07-05 1920-09-24 Bernhard Conrad Artificial foot
US2315795A (en) * 1940-06-17 1943-04-06 Conrad B Johnson Artificial limb
GB625528A (en) * 1946-04-24 1949-06-29 Thorsten Wallentin Larsson Foot prosthesis
US2475373A (en) * 1947-12-11 1949-07-05 John G Catranis Three-part artificial foot(lateral motion and ankle rotation)

Patent Citations (7)

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DE308671C (en) *
US809875A (en) * 1904-06-18 1906-01-09 George E Wilkins Artificial limb.
GB190907781A (en) * 1909-04-01 1910-03-03 Joseph Hancock Bradley A Novel or Improved Artificial Foot.
DE326131C (en) * 1919-07-05 1920-09-24 Bernhard Conrad Artificial foot
US2315795A (en) * 1940-06-17 1943-04-06 Conrad B Johnson Artificial limb
GB625528A (en) * 1946-04-24 1949-06-29 Thorsten Wallentin Larsson Foot prosthesis
US2475373A (en) * 1947-12-11 1949-07-05 John G Catranis Three-part artificial foot(lateral motion and ankle rotation)

Cited By (93)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800333A (en) * 1971-01-07 1974-04-02 Friberg Ab K Artificial leg
US4204284A (en) * 1977-11-16 1980-05-27 Lord Corporation Joint prosthesis with contoured pin
US4229839A (en) * 1977-11-16 1980-10-28 Lord Corporation Joint prosthesis
US4231122A (en) * 1977-11-16 1980-11-04 Lord Corporation Knee joint prosthesis
DE3239959A1 (en) * 1982-10-28 1984-05-10 Heintz Bruno Ankle joint for leg prostheses
US4655778A (en) * 1985-08-12 1987-04-07 Harrington Arthritis Research Center Joint prosthesis
US4652266A (en) * 1986-03-07 1987-03-24 Kingsley Mfg. Co. Molded elastomeric prosthetic foot having energy-storing articulated keel
US5593457A (en) * 1989-04-13 1997-01-14 Phillips; Van L. Foot prosthesis having auxiliary ankle construction
US6165227A (en) * 1989-04-13 2000-12-26 Phillips; Van L. Attachment construction for prosthesis
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
US5514186A (en) * 1989-04-13 1996-05-07 Phillips; Van L. Attachment construction for prosthesis
US5728176A (en) * 1989-04-13 1998-03-17 Flex-Foot, Inc. Attachment construction for prosthesis
US5549714A (en) * 1990-09-21 1996-08-27 Phillips; Van L. Symes foot prosthesis
US5509938A (en) * 1991-02-28 1996-04-23 Phillips; Van L. Prosthetic foot incorporating adjustable bladder
US5514185A (en) * 1991-02-28 1996-05-07 Phillips; Van L. Split foot prosthesis
US5545234A (en) * 1991-04-04 1996-08-13 Collier, Jr.; Milo S. Lower extremity prosthetic device
US5314499A (en) * 1991-04-04 1994-05-24 Collier Jr Milo S Artificial limb including a shin, ankle and foot
US5458656A (en) * 1991-09-30 1995-10-17 Flex-Foot Energy-storing prosthesis leg pylon vertical shock leg
US5826304A (en) * 1993-08-06 1998-10-27 Carlson; J. Martin Composite flexure unit
US5888238A (en) * 1994-05-27 1999-03-30 Phillips; Van L. Plug mounted prosthesis
US5593455A (en) * 1994-05-27 1997-01-14 Phillips; Van L. Plug mounted prosthesis
US5993488A (en) * 1994-08-15 1999-11-30 Phillips; Van L. Prosthesis with resilient ankle block
US5800569A (en) * 1994-08-15 1998-09-01 Phillips; Van L. Prosthesis with resilient ankle block
US20050234563A1 (en) * 1994-08-15 2005-10-20 Phillips Van L Foot prosthesis having cushioned ankle
US7354456B2 (en) 1994-08-15 2008-04-08 Phillips Van L Foot prosthesis having cushioned ankle
US5728177A (en) * 1994-08-15 1998-03-17 Flex-Foot, Inc. Prosthesis with foam block ankle
US20020087216A1 (en) * 1996-02-16 2002-07-04 Atkinson Stewart L. Prosthetic walking system
US6511512B2 (en) 1998-04-10 2003-01-28 Ossur Hf Active shock module prosthesis
US20100106260A1 (en) * 1998-04-10 2010-04-29 Phillips Van L Foot prosthesis having cushioned ankle
US6478826B1 (en) 1998-04-10 2002-11-12 Van L. Phillips Shock module prosthesis
US7879110B2 (en) 1998-04-10 2011-02-01 Ossur Hf Foot prosthesis having cushioned ankle
US7279011B2 (en) 1998-04-10 2007-10-09 Phillips Van L Foot prosthesis having cushioned ankle
US7169190B2 (en) 1998-04-10 2007-01-30 Van L. Phillips Active shock module prosthesis
US6280479B1 (en) 1998-04-10 2001-08-28 Flex-Foot, Inc. Foot prosthesis having cushioned ankle
US6887279B2 (en) 1998-04-10 2005-05-03 össur hf Active shock module prosthesis
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