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Publication numberUS3874004 A
Publication typeGrant
Publication dateApr 1, 1975
Filing dateMay 28, 1974
Priority dateMay 31, 1973
Also published asDE2426070A1, DE2426070B2, DE2426070C3
Publication numberUS 3874004 A, US 3874004A, US-A-3874004, US3874004 A, US3874004A
InventorsMay Denis Ronald William
Original AssigneeHanger & Co Ltd J E
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Symes ankle joint
US 3874004 A
Abstract
The invention provides an artificial ankle joint particularly suitable for patients who have undergone the Symes amputation. An effective ankle pivot center is provided at substantially the natural position by the use of a pair of links pivoted to points on the metal sole plate of an artificial foot and points, spaced nearer together, on a stump socket.
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Description  (OCR text may contain errors)

United States Patent May Apr. 1, 1975 i 1 SYMES ANKLE JOINT 975.439 11/1910 Lawrence .1 3/32 l.l02,774 7/l9l4 M t' h k 3 34 [751 Memo" 5:"? kdonald 1.323,444 12/1919 t 333 g an [73] Assignee: J. E. Hanger & Company Limited, FOREIGN PATENTS OR APPLICATONS L d E l d 325,333 9/!920 Germany 4. 3/6 455,64l 2/1928 Germany 3/6 [22] Filed; May 28, 1974 [2]] Appl. No: 474,064 Primary E.\'aminerRonald L. Frinks Attorney, Agent, or Firm-Imirie, Smiley & Linn [30] Foreign Application Priority Data May 31 @973 United Kingdom 1. 25978/73 [57} ABSTRACT [52] U5. CL I I I I H 3/33 3/7 The invention provides an artificial ankle joint partic- {511 lm. CL ularly suitable for patients who have undergone the [58] Field ofgearch 3/3045 Symes amputation. An effective ankle pivot center is provided at substantially the natural position by the use of a pair of links pivoted to points on the metal {56] References Ci'ed sole plate of an artificial foot and points. spaced UNITED STATES PATENTS nearer together, on a stump socket 487,697 l2/l892 Ehle 3/33 7 Claims, 2 Drawing Figures QJEHTED APR 1 I975 SHEET 1 BF 2 PATENTEI] APR 1 i975 swear} 1 SYMES ANKLE JOINT This invention concerns improvements in artificial ankle joints. It is particularly but not exclusively directed to the provision of joints suitable for patients who have undergone the Symes amputation (disarticulation of the ankle); the joints also lend themselves to use with mono-tubular of skeletal modular legs and can accommodate appreciably longer below the knee stumps.

The Syrnes amputation results in a functionally good stump because the end of the stump is capable of taking the full weight of the patient. Prosthetic replacement, however. is difficult because of the small ground clearance. This is the distance between the end of the stump and the ground when the patient is standing level, and may be as little as one inch.

The patient has good control of the hip and knee, as these musculatures are not affected by this type of amputation. therefore patients are usually very active and require a robust device.

Devices in accordance with the invention make provision for an ankle joint to be supplied within the space of 1 inch from the base of the stump.

According to the invention we provide an artificial ankle joint comprising a metal sole plate within an artificial foot. the said sole plate carrying pivot bearings for a posterior upwardly and forwardly sloped swinging link and an anterior upwardly and rearwardly sloped swinging link. the said links being pivoted at their upper ends to posterior and and anterior lugs forming part of patient weight-bearing structure. and a pre-compressed resilient stress-relieving control block located between the sole plate and the weight-bearing structure.

The weight-bearing structure may be a stump socket or a plate fitted to the lower end of a modular leg. In either case its base may have a ground clearance of less than 30mm.

The swinging links may have an effective length less than 2()mm., the pivot bearings on the sole plate may have centres a little over lOOmm apart. while the lugs on the weight-bearing structure may provide pivot centres somewhat less than 80mm apart.

The locus of instantaneous centres of rotation of the joint. that is the points of intersection of the extended axes of the two links. forms an inverted hyperbola which passes through the two lower pivot centres and the effective ankle pivot at zero deflection.

The locus of the effective ankle pivot moves only about one-eighth inch over the range of Plant-aflexion to l2- doriflexion. This enables the effective ankle centre to be approximately I/4 inches up inside the stump (i.e. approximately at the level of the lateral maleolus. the natural ankle level).

At full dorsiflexion the instantaneous centre is back at the rear lower pivot and at full plantafexion it is in front at the forward lower pivot. The effective lever distances to the control rubber are great (compared with single axis ankle joints), the rubber loadings being thus relieved and reducing the stresses in the unit.

Two constructional forms of ankle joint are illustrated in the accompanying drawings, in which;

FIG. 1 is a vertical section through a joint suitable for a disarticulated ankle, and

FIG. 2 is a vertical section through a joint suitable for use with a modular leg.

In FIG. 1 the metal sole plate 1 carries posterior pivot bearing 2 and an anterior pivot bearing 3 carrying swinging links 4A and 48 respectively.

A stump socket 5 carries posterior and anterior lugs to which the upper ends oflinks 4A and 4B are pivoted.

A rubber block 6 is bonded to the plate 1 and is precompressed to bear against the base of the socket 5.

A balata toe spring assembly 7 is secured to the forward part of the plate 1 and a foamed plastic foot is moulded around the whole.

The locus of the instantaneous centres of rotation is indicated by the broken line 8.

In FIG. 2 like references denote like parts to those of FIG. 1. In the illustrated joint the stump socket 5 has been replaced by the modular leg fitting 10.

The fitting 11, shown in broken lines, is in the position requisite for attachment to a conventional ankle joint and demonstrates that a modular leg tube more than 2 inches longer can be accommodated by use of the linkage joint of the invention.

It will be understood that the invention is not restricted to the details of the preferred form which has been described by way ofexample which can be modified without departure from the broad ideas underlying them.

I claim:

1. An artificial ankle joint comprising a metal sole plate within an artificial foot, the said sole plate carrying pivot bearings for a posterior upwardly and forwardly sloped swinging link and an anterior upwardly and rearwardly sloped swinging link. the said links being pivoted at their upper ends to posterior and an anterior lugs forming part of patient weight-bearing structure, and a pre-compressed resilient stressrelieving control block located between the sole plate and the weight-bearing structure.

2. An artificial ankle joint according to claim 1 in which the weight-bearing structure is a stump socket.

3. An artificial ankle joint according to claim I, in which the weight-bearing structure is a plate fitted to the lower end of a modular artificial leg.

4. An artificial ankle joint according to claim 1, in which the instantaneous centres of rotation of the joint, namely the intersection points of the axes of the two links, forms an inverted hyperbola which passes through the two lower pivot centres and through the locus of the effective ankle pivot at zero deflection of the joint.

5. An artificial ankle joint according to claim 1, in which the length of each link is less than 30 mm.

6. An artificial ankle joint according to claim 1, in which the pivot bearings on the sole plate are more than 100 mm apart.

7. An artificial ankle joint according to claim I, in which the lugs on the weight-bearing structure are less than mm apart.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US487697 *Feb 12, 1892Dec 6, 1892F OneHomer f
US975439 *May 31, 1910Nov 15, 1910F FortyArtificial limb.
US1102774 *Aug 13, 1913Jul 7, 1914 Artificial leg.
US1323444 *Mar 29, 1919Dec 2, 1919 Artificial leg.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4225982 *Dec 4, 1978Oct 7, 1980Cochrane Ian WMolded syme foot with attached stump socket
US4413360 *Oct 27, 1981Nov 8, 1983Lamb Steve RAdjustable prosthetic ankle assembly
US4442554 *Feb 12, 1982Apr 17, 1984Arthur CopesProsthesis means
US4645509 *Jun 11, 1984Feb 24, 1987Model & Instrument Development CorporationProsthetic foot having a cantilever spring keel
US4718913 *May 27, 1986Jan 12, 1988Voisin Jerome PDual, ankle, springs prosthetic foot and ankle system
US5037444 *Jan 5, 1989Aug 6, 1991Phillips L VanProsthetic foot
US5066305 *Oct 25, 1988Nov 19, 1991Model & Instrument Development CorporationProsthetic foot having a low profile cantilever spring keel
US5181932 *Apr 13, 1989Jan 26, 1993Phillips L VanFoot prosthesis having auxiliary ankle construction
US5314499 *Apr 4, 1991May 24, 1994Collier Jr Milo SArtificial limb including a shin, ankle and foot
US5458656 *Dec 20, 1993Oct 17, 1995Flex-FootEnergy-storing prosthesis leg pylon vertical shock leg
US5486209 *Jul 1, 1994Jan 23, 1996Phillips; Van L.Foot prosthesis having auxiliary ankle construction
US5509938 *Jan 4, 1994Apr 23, 1996Phillips; Van L.Prosthetic foot incorporating adjustable bladder
US5514185 *Jan 21, 1994May 7, 1996Phillips; Van L.Split foot prosthesis
US5514186 *Mar 8, 1994May 7, 1996Phillips; Van L.Attachment construction for prosthesis
US5545234 *Nov 1, 1994Aug 13, 1996Collier, Jr.; Milo S.Lower extremity prosthetic device
US5549714 *Jan 12, 1995Aug 27, 1996Phillips; Van L.Symes foot prosthesis
US5593457 *Sep 22, 1995Jan 14, 1997Phillips; Van L.Foot prosthesis having auxiliary ankle construction
US5728176 *Oct 30, 1995Mar 17, 1998Flex-Foot, Inc.Attachment construction for prosthesis
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US5800569 *Aug 15, 1995Sep 1, 1998Phillips; Van L.Prosthesis with resilient ankle block
US5800570 *Mar 14, 1996Sep 1, 1998Collier; Milo S.Lower extremity prosthetic device
US5976191 *Oct 8, 1996Nov 2, 1999Phillips; Van L.Foot prosthesis having curved forefoot
US5993488 *May 13, 1998Nov 30, 1999Phillips; Van L.Prosthesis with resilient ankle block
US6206934Aug 21, 1998Mar 27, 2001Flex-Foot, Inc.Ankle block with spring inserts
US6280479Apr 9, 1999Aug 28, 2001Flex-Foot, Inc.Foot prosthesis having cushioned ankle
US6406500Nov 2, 1999Jun 18, 2002Van L. PhillipsFoot prosthesis having curved forefoot
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US6743260Jul 31, 2001Jun 1, 2004Barry W. TownsendProsthetic foot
US6811571Jun 1, 2000Nov 2, 2004Van L. PhillipsUniversal prosthesis with cushioned ankle
US6875241Feb 5, 2003Apr 5, 2005Roland J. Christensen, As Operating Manager Of Rjc Development Lc, General Partner Of The Roland J. Christensen Family Limited PartnershipVariable resistance cell
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US6966933Oct 21, 2003Nov 22, 2005Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited PartnershipProsthetic foot with an adjustable ankle and method
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US7172630Feb 20, 2004Feb 6, 2007Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited PartnershipProsthetic foot with cam
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US7419509Sep 8, 2004Sep 2, 2008Freedom Innovations, LlcProsthetic foot with a resilient ankle
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US7520904Oct 19, 2005Apr 21, 2009Freedom Innovations, LlcProsthetic foot with an adjustable ankle and method
US7572299Mar 15, 2006Aug 11, 2009Freedom Innovations, LlcProsthetic foot with energy transfer
US7581454Sep 20, 2004Sep 1, 2009össur hfMethod of measuring the performance of a prosthetic foot
US7618464Aug 3, 2006Nov 17, 2009Freedom Innovations, LlcProsthetic foot with variable medial/lateral stiffness
US7686848Jan 4, 2008Mar 30, 2010Freedom Innovations, LlcProsthetic foot with energy transfer
US7727285Jan 22, 2008Jun 1, 2010Freedom Innovations, LlcProsthetic foot with variable medial/lateral stiffness
US7794506Sep 16, 2008Sep 14, 2010Freedom Innovations, LlcMulti-axial prosthetic ankle
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US7879110Dec 1, 2009Feb 1, 2011Ossur HfFoot prosthesis having cushioned ankle
US7891258Aug 7, 2009Feb 22, 2011össur hfMethod of measuring the performance of a prosthetic foot
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US8377146Jul 18, 2011Feb 19, 2013Ossur HfLow profile prosthetic foot
US8486156Feb 24, 2011Jul 16, 2013össur hfProsthetic foot with a curved split
US8500825Jun 29, 2010Aug 6, 2013Freedom Innovations, LlcProsthetic foot with floating forefoot keel
US8685109Mar 24, 2009Apr 1, 2014össur hfSmooth rollover insole for prosthetic foot
WO1989000035A1 *Jul 8, 1987Jan 12, 1989Jerome P VoisinProsthetic foot and ankle system
Classifications
U.S. Classification623/50, 623/55
International ClassificationA61F2/60, A61F2/66
Cooperative ClassificationA61F2/6607, A61F2002/6657, A61F2/66
European ClassificationA61F2/66