US2617115A - Ankle joint for artificial legs - Google Patents

Ankle joint for artificial legs Download PDF

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Publication number
US2617115A
US2617115A US106690A US10669049A US2617115A US 2617115 A US2617115 A US 2617115A US 106690 A US106690 A US 106690A US 10669049 A US10669049 A US 10669049A US 2617115 A US2617115 A US 2617115A
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leg
plate
ankle joint
upper plate
lower plate
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US106690A
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Emmett C Ellery
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Emmett C Ellery
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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
    • 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
    • A61F2/60Artificial legs or feet or parts thereof
    • 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
    • A61F2002/5003Prostheses not implantable in the body having damping means, e.g. shock absorbers
    • 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
    • A61F2002/5009Prostheses not implantable in the body having elastic means different from springs, e.g. including an elastomeric insert having two or more elastomeric blocks
    • 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

Description

Nov. 11, 1952 E. c. ELLERY 2,617,115

ANKLE JOINT FOR ARTIFICIAL LEGS Filed July' 25, 1949 FIG. l.1

FIG. 2.

FIG'. 3.

25 I8 25 I5; I7

FIG. 6.

l 7 WWII/4&4...

42 ATTORNEYS Patented Nov. 11, 1952 UN IT'ED f ).FFH3131` ANKLE .J 01N 'l5 FOR ARTIFICIAL .LEGS

Emmen c. Euere; Hollywood; ea-1in Application Julyz, 194e. V Serial No.. 1.06.6911

(CL2 S+-6).,

4 Claims. 1

This invention has to do with articial legs'of a type embodying v.a feet ,member pvetalyeennected .to a leg member for limited relative pivetel movement..

While severaltypes of ankle joints have been devised for. .use in artificial legs, so far .as I am aware such. joints have been unsatisfactory'in that when worn for any length of time they Cause pressure sores to develop on the amputated stump of the wearer. For example, one form of joint which has been. widelyj used in artificial legs makes use ofV pairA oirubberbumpers for limiting and resisting thepivo-talactionoffthefoot relative to` ,theleg.. Since considerable. forceis required to compress theiubber,.bumperelements to obtain pivotal movement ofthe parts, pressure is brought to bear upon localized areas .of the stumpresulting insores which-can become quite painful. As .a result, the wearerv of this type-of leg nds it extremely ydiiiicult to properly manipulate the leg..

Another diiliculty with. conventionalf artificial legs is the fact that they .do not provide for automatically raising the forward portion-of the foot with the result that a wearer tends to stub the toe portion of the foot andvcannot swing the leg forwardly in `avertical plane without constant danger of -falling. It is alsotrue of many -joints tha-.t only very limited movement is possible at the ankle joint.

An object of this inventionfisto provide anovel and improVedankle-jjoint structure-for an artiiic-ialleg` =which does-I not have'. the.` aboveenoted disadvantages inherent inalegs; having `converttional` ankle Vj oints A particular Object is to prov-ide aniankle joint which. does `not result in undue pressure being brought upon the stump-ofthe `wearer of-an artificial leg embodying fthe joint'. vwith the result that the v-eerer/.is entirely free .of lpressure sores and theleg may ,be comfortably. wor-n.

Anotherobjeetis `to providefan anklevjoi-nt :for anarticial leg. in. which means are vprovided .ior autmatieally raisingf-the toe or forward portion. of. .the foot lof. Ythe. lappliance Fwhenq-the weight of the wearer is taken off the leg in normal walking thereby. greatly diminishing the hazards. of walking., especially over uneven ground and upgrade.

A further .object of. the inventionistofprovide an ankle joint. means.whichl isv deeigned --to ,absorb the shock when .thelee contacts the groundv -as the walking step begins.

Av still further object of the invention is.to provide an anklejoint structure permittinga,

relatively large pivotal movement embodying means for adjusting the amount of pivotal movement or excursionfof the joint.

Another object is to provide ankle joint means in whichv spring means is employed `for automatically raising the 'toe of the foot and 'for absorbing the shock-of the heel striking the ground.

Af-fur-therobject of the invention is t0 DIfovide asimple ankle joint--construction which may be economically manufactured and readily installed in articial legs.

These and "otherobjects will be Yapparent from the drawing and the following descrptionthereof;

Referring to the drawing, which is for illustrative purposes only:

Figs l *isi an elevational Iview partly broken away of an artificial leg embodying the invention;

Fig. 2 `is aside elevational view of an ankle vjoint structure embodyingvthe invention;

Fig.l 3 'is a plan view of thestructure of Fig.Y 2;

Fig.l 4 isa sectional view onthe line i4-4 Yof Fig. 2

Fig. 5V-isa sectional lview onfthe line 5--5 of IFig'. 3; and

Fig. 6 is a cross section-on the line S- of Fig. 2.'

More particularly describing the invention, reference numeral I I generally indicates an arti- .cial leg-which includes a leg part I2 and a foot member III.. These parts vare pivotally connected for vlimited `relative pivotal movement by. means offanl ankle -joint structure generally indicated by .numeral 15."

The ankle joint structure I 5 comprises basically a pair of plates which are hingedly or pivotallyv connected together vwith means -for adjustably limiting the pivotal 'movement -of lthe plates and a-means for biasing the plates in one direction. Referring particularly to "Figs,- 2-6,' the ankle joint-means includes an upper plate member I6 and 'a.=lower plate I'I. The upper plate is provided With' anupwardly'extending centrally 1ocated boss I8 having `a threaded socket i9 for the .reception of afboltwhich is held in position bymeans vofae-retaining nut 2I. The bolt 20-is adapted toeXtend-.through an opening 23 formed in a mounting partition 24 (Fig. 1). at the lower endor the-leg portion I2fof the. artificial leg. The plete I6 .is .alsosprovided withanpropriate .holes p25 ferr-the v`re,Cantieriof fxneunting screws. and these-together.. with gafnut. 26 and a Washer 21.0n the lbolt serveto-secure the Yupper.plate tothe leg.

Theaupper. plate.. is formed Eto. provideA` three depending centrally disposed lugs or ears, the outer two of which have been indicated by the numeral 30 and the innermost or centrally disposed one of which has been indicated by numeral 3l. These parts of the upper plate are provided with axially aligned bores 30', 3 I for receiving a pivot pin 32 which will be further described later.

The lower plate I'I is centrally apertured at 35 and is provided with a pair of guide ribs 36 on its inner surface. A U-shaped connecting member 38, including a base portion 39, adapted to t between the guide ribs 36, serves to mount the lower plate I'I and connect it to the upper plate. The connecting member is provided with a threaded bore 39' in the base 39 which receives a mounting bolt 42, the mounting bolt being provided with a shoulder 43 for abutting the outer surface of the lower plate I'I.

The connecting member 38 includes the two leg portions 45 which are bored at 45 to receive the pivot pin 32. Various means may be provided for securing the mounting pin in place. However, in the form of the invention shown, each of the outer lugs 30 of the upper plate are recessed at 41 to receive retaining washers 4B. These washers accommodate retaining screws 49 which thread into the ends of the pivot pin 32.

The mounting pin 42 is adapted to extend through a bore 52 in the body 53 of the foot element I4 of the artiicial leg. In addition, the lower plate is provided with screw holes 54 so that the plate may be additionally anchored to the body 53 by screws (not shown).

It will be obvious from the description thus far that the construction described provides for pivotal movement of the plates I6 and I'! relative to each other. In order to limit this movement a pair of adjustable stops; is provided. Re-

ferring particularly to Figs. 2 and 5, these stops are mounted on the lower plate one at each end thereof and each comprises an adjustment screw 56 which is threadedly received in the plate and which carries a lock or retaining nut 51 thereon for locking the screw in adjusted position. The inner ends of the screws are provided with a flat plate-like head 58 upon which is mounted a rubber or rubber-like bumper 60. The bumpers are adapted to contact the inner surface of the upper plate I6 and for this purpose the heel or rearward end of that plate is provided with a recess 6I on its inner surface for the reception of the rear stop member.

It is a particular feature of the invention that means are provided in the ankle joint for automatically cushioning the leg as the heel contacts the ground during walking and for automatically raising the toe of the foot when weight is taken off the leg. The means for accomplishing this comprises a compression spring 64 which is mounted rearwardly of the pivotal axis of the plates and is shown as carried on a pin 65 mounted on the lower plate. The upper end portion of the spring is received within a suitable bore or recess 56 formed in the underside of the upper plate I6.

It will be apparent that, with the construction described, the excursion or amount of relative pivotal movement between the upper and lower plates and hence the foot I4 and leg I2 of the articial leg, may be limited and adjusted to suit a particular wearer by means of the adjustable stop or abutment means described. It will also be apparent that the spring 54 serves as a means for cushioning the shock or jar of the leg contacting the ground and serves to automatically raise the toe or forward portion of the foot I4 during walking as the weight of the wearer is taken off the leg. It is, of course, contemplated that a tension spring might be employed forwardly of the pivotal axis of the plates in place of the compression spring shown;

Although the invention has been particularly shown and described, it is contemplated that various changes and modications can be made without departing from the scope thereof as defined in the claims.

I claim:

l. In ankle joint means for an artificial leg having a leg portion and a foot portion, an upper plate having an upwardly extending mounting bolt for securing the plate to the leg portion of the artificial leg, said plate having apertured depending lugs centrally thereof, a lower plate, a pivot pin carried by the lugs on the upper plate, a connecting member receiving said pivot pin and pivotally connected to the upper plate thereby, a mounting bolt detachably securing said lower plate to said connecting member and being adapted to secure said connecting member and lower plate as a unit to the foot portion of the artificial leg, a spring interposed between said plate for biasing the plates pivotally in one direction, and a pair of adjustable stops for limiting relative pivotal movement of the plates, said stops being located one at each end of said lower plate and each comprising a set screw carrying a resilient pad for engagement by the upper plate.

2. In ankle joint means for an artificial leg having a leg portion and a foot portion, an upper plate, said plate having apertured depending lugs centrally thereof, a lower plate, a pivot pin carried by the lugs on the upper plate, a connecting member receiving said pivot pin and pivotally connected to the upper plate thereby, a mounting bolt detachably securing said lower plate to said connecting member and being adapted to secure said connecting member and lower plate as a unit to the foot portion of the articial leg, and a pair of adjustable stops for limiting relative pivotal movement of the plates, said stops beng located one at each end of said lower plate and each comprising a set screw carrying a resilient pad for engagement by the upper plate.

3. In ankle joint means for an artificial leg having a leg portion and a foot portion, an upper plate, said plate having apertured depending lugs centrally thereof, a lower plate, a pivot pin carried by the lugs on the upper plate, a connecting member receiving said pivot pin and pivotally connected to the upper plate thereby, a mounting bolt detachably securing said lower plate to said connecting member and being adapted to secure said connecting member and lower plate as a unit to the foot portion of the artificial leg, and a spring interposed between said plates for biasing the plates pivotally in one direction.

4. In ankle joint means for an artificial leg having a leg portion and a foot portion, an upper plate, said plate having apertured depending lugs centrally thereof, a lower plate, a pivot pin carried by the lugs on the upper plate, a connecting member receiving said pivot pin and pivotally connected to the upper plate thereby, a mounting bolt detachably securing said lower plate tc saidv connecting member and being adapted to REFEREL CES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Number Name Date Foster June 29, 1869 Loeiller July 1, 1902 Gaines et al Aug. 5, 1913 Beck July 9, 1940 FOREIGN PATENTS Country Date Germany Mar. 27, 1923 Germany Sept. 29, 1925

US106690A 1949-07-25 1949-07-25 Ankle joint for artificial legs Expired - Lifetime US2617115A (en)

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499613A (en) * 1983-03-01 1985-02-19 Yarrow Harry A Ankle joint and coupling for artificial limbs
US4605417A (en) * 1984-10-03 1986-08-12 Fleischauer K E Prosthetic joint
EP0255556A1 (en) * 1986-08-08 1988-02-10 K.E. Fleischauer Prosthetic joint
FR2658717A1 (en) * 1990-02-26 1991-08-30 Adcro Section Ceraval Adjustable prosthetic foot/ankle assembly made essentially of composite material
US5728175A (en) * 1995-10-03 1998-03-17 Rincoe; Richard G. Artificial ankle joint with cushion structures and prosthetic devices formed therewith
WO1998053769A1 (en) * 1997-05-30 1998-12-03 College Park Industries, Inc. Prosthetic foot assembly having improved resilient cushions and components
US6120547A (en) * 1998-11-06 2000-09-19 Roland J. Christensen Enhanced prosthetic foot structure with ankle reinforcement
US6663673B2 (en) 2000-06-30 2003-12-16 Roland J. Christensen Prosthetic foot with energy transfer medium including variable viscosity fluid
US20040068327A1 (en) * 2002-10-08 2004-04-08 Christensen Roland J. Prosthetic foot with a resilient ankle
US20040068326A1 (en) * 2002-10-08 2004-04-08 Christensen Roland J. Prosthetic foot with oblique attachment
US20040068325A1 (en) * 1998-04-10 2004-04-08 Phillips Van L. Shock module prosthesis
US6805717B2 (en) 2002-10-08 2004-10-19 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Manager Of The Roland J. Christensen Family Limited Partnership Energy-storing prosthetic foot with elongated forefoot
US20050033450A1 (en) * 2002-10-08 2005-02-10 Christensen Roland J. Prosthetic foot with a resilient ankle
US20050071017A1 (en) * 2003-09-30 2005-03-31 Lecomte Christophe Guy Low profile active shock module prosthesis
US6875241B2 (en) 2000-06-30 2005-04-05 Roland J. Christensen, As Operating Manager Of Rjc Development Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Variable resistance cell
US20050203640A1 (en) * 2002-10-08 2005-09-15 Christensen Roland J. Prosthetic foot with a resilient ankle
US6966933B2 (en) 2003-10-21 2005-11-22 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with an adjustable ankle and method
US7169190B2 (en) 1998-04-10 2007-01-30 Van L. Phillips Active shock module prosthesis
US7172630B2 (en) 2004-02-20 2007-02-06 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with cam
US7341603B2 (en) 2000-06-30 2008-03-11 Applied Composite Technology, Inc. Prosthetic foot with energy transfer including variable orifice
US7462201B2 (en) 2003-10-21 2008-12-09 Freedom Innovations, Llc Prosthetic foot with an adjustable ankle and method
US7520904B2 (en) 2003-10-21 2009-04-21 Freedom Innovations, Llc Prosthetic foot with an adjustable ankle and method
US7572299B2 (en) 2000-06-30 2009-08-11 Freedom Innovations, Llc Prosthetic foot with energy transfer
US7618464B2 (en) 2006-08-03 2009-11-17 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US7686848B2 (en) 2000-06-30 2010-03-30 Freedom Innovations, Llc Prosthetic foot with energy transfer
US7727285B2 (en) 2007-01-30 2010-06-01 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US7794506B2 (en) 2007-09-18 2010-09-14 Freedom Innovations, Llc Multi-axial prosthetic ankle
US7824446B2 (en) 2006-12-06 2010-11-02 Freedom Innovations, Llc Prosthetic foot with longer upper forefoot and shorter lower forefoot
US8034121B2 (en) 2008-04-18 2011-10-11 Freedom Innovations, Llc Prosthetic foot with two leaf-springs joined at heel and toe
US8500825B2 (en) 2010-06-29 2013-08-06 Freedom Innovations, Llc Prosthetic foot with floating forefoot keel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US92031A (en) * 1869-06-29 Improved artificial leg
US703431A (en) * 1902-03-24 1902-07-01 Edward F Loeffler Artificial limb.
US1069409A (en) * 1912-08-20 1913-08-05 Arthur E Gaines Ankle-joint for artificial feet.
DE372426C (en) * 1921-10-08 1923-03-27 Anton Leisten Artificial foot
DE419380C (en) * 1924-03-28 1925-09-29 Robert Kellner Connecting link between the Gegenflaechen on artificial lower leg and foot forming mutual hinge plates
US2207473A (en) * 1937-11-26 1940-07-09 Gilbert E Beck Artificial limb

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US92031A (en) * 1869-06-29 Improved artificial leg
US703431A (en) * 1902-03-24 1902-07-01 Edward F Loeffler Artificial limb.
US1069409A (en) * 1912-08-20 1913-08-05 Arthur E Gaines Ankle-joint for artificial feet.
DE372426C (en) * 1921-10-08 1923-03-27 Anton Leisten Artificial foot
DE419380C (en) * 1924-03-28 1925-09-29 Robert Kellner Connecting link between the Gegenflaechen on artificial lower leg and foot forming mutual hinge plates
US2207473A (en) * 1937-11-26 1940-07-09 Gilbert E Beck Artificial limb

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499613A (en) * 1983-03-01 1985-02-19 Yarrow Harry A Ankle joint and coupling for artificial limbs
US4605417A (en) * 1984-10-03 1986-08-12 Fleischauer K E Prosthetic joint
EP0255556A1 (en) * 1986-08-08 1988-02-10 K.E. Fleischauer Prosthetic joint
FR2658717A1 (en) * 1990-02-26 1991-08-30 Adcro Section Ceraval Adjustable prosthetic foot/ankle assembly made essentially of composite material
US5728175A (en) * 1995-10-03 1998-03-17 Rincoe; Richard G. Artificial ankle joint with cushion structures and prosthetic devices formed therewith
WO1998053769A1 (en) * 1997-05-30 1998-12-03 College Park Industries, Inc. Prosthetic foot assembly having improved resilient cushions and components
US6537322B1 (en) 1997-05-30 2003-03-25 Christopher Lyle Johnson Prosthetic foot assembly having improved resilient cushions and components
US7169190B2 (en) 1998-04-10 2007-01-30 Van L. Phillips Active shock module prosthesis
US20040068325A1 (en) * 1998-04-10 2004-04-08 Phillips Van L. Shock module prosthesis
US6120547A (en) * 1998-11-06 2000-09-19 Roland J. Christensen Enhanced prosthetic foot structure with ankle reinforcement
US7686848B2 (en) 2000-06-30 2010-03-30 Freedom Innovations, Llc Prosthetic foot with energy transfer
US7572299B2 (en) 2000-06-30 2009-08-11 Freedom Innovations, Llc Prosthetic foot with energy transfer
US6663673B2 (en) 2000-06-30 2003-12-16 Roland J. Christensen Prosthetic foot with energy transfer medium including variable viscosity fluid
US6875241B2 (en) 2000-06-30 2005-04-05 Roland J. Christensen, As Operating Manager Of Rjc Development Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Variable resistance cell
US6875242B2 (en) 2000-06-30 2005-04-05 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with energy transfer medium including variable viscosity fluid
US20040133284A1 (en) * 2000-06-30 2004-07-08 Christensen Roland J. Prosthetic foot with energy transfer medium including variable viscosity fluid
US7341603B2 (en) 2000-06-30 2008-03-11 Applied Composite Technology, Inc. Prosthetic foot with energy transfer including variable orifice
US20050033450A1 (en) * 2002-10-08 2005-02-10 Christensen Roland J. Prosthetic foot with a resilient ankle
US6911052B2 (en) 2002-10-08 2005-06-28 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with oblique attachment
US20040068326A1 (en) * 2002-10-08 2004-04-08 Christensen Roland J. Prosthetic foot with oblique attachment
US20050203640A1 (en) * 2002-10-08 2005-09-15 Christensen Roland J. Prosthetic foot with a resilient ankle
US20040068327A1 (en) * 2002-10-08 2004-04-08 Christensen Roland J. Prosthetic foot with a resilient ankle
US7419509B2 (en) 2002-10-08 2008-09-02 Freedom Innovations, Llc Prosthetic foot with a resilient ankle
US6805717B2 (en) 2002-10-08 2004-10-19 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Manager Of The Roland J. Christensen Family Limited Partnership Energy-storing prosthetic foot with elongated forefoot
US6929665B2 (en) 2002-10-08 2005-08-16 Roland J. Christensen Prosthetic foot with a resilient ankle
US20050071017A1 (en) * 2003-09-30 2005-03-31 Lecomte Christophe Guy Low profile active shock module prosthesis
US20060004467A1 (en) * 2003-09-30 2006-01-05 Lecomte Christophe G Low profile active shock module prosthesis
US7371262B2 (en) 2003-09-30 2008-05-13 össur hf Low profile active shock module prosthesis
US6969408B2 (en) 2003-09-30 2005-11-29 Ossur Engineering, Inc. Low profile active shock module prosthesis
US7462201B2 (en) 2003-10-21 2008-12-09 Freedom Innovations, Llc Prosthetic foot with an adjustable ankle and method
US7520904B2 (en) 2003-10-21 2009-04-21 Freedom Innovations, Llc Prosthetic foot with an adjustable ankle and method
US6966933B2 (en) 2003-10-21 2005-11-22 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with an adjustable ankle and method
US7172630B2 (en) 2004-02-20 2007-02-06 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with cam
US7618464B2 (en) 2006-08-03 2009-11-17 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US7824446B2 (en) 2006-12-06 2010-11-02 Freedom Innovations, Llc Prosthetic foot with longer upper forefoot and shorter lower forefoot
US7727285B2 (en) 2007-01-30 2010-06-01 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US7794506B2 (en) 2007-09-18 2010-09-14 Freedom Innovations, Llc Multi-axial prosthetic ankle
US8034121B2 (en) 2008-04-18 2011-10-11 Freedom Innovations, Llc Prosthetic foot with two leaf-springs joined at heel and toe
US8500825B2 (en) 2010-06-29 2013-08-06 Freedom Innovations, Llc Prosthetic foot with floating forefoot keel

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