US2640200A - Prosthesis construction - Google Patents

Prosthesis construction Download PDF

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US2640200A
US2640200A US176459A US17645950A US2640200A US 2640200 A US2640200 A US 2640200A US 176459 A US176459 A US 176459A US 17645950 A US17645950 A US 17645950A US 2640200 A US2640200 A US 2640200A
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plate
foot
leg
stem
leg stem
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Wisbrun Walter
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/60—Artificial legs or feet or parts thereof
    • A61F2/66—Feet; Ankle joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F2/00—Filters 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2002/5072—Prostheses not implantable in the body having spring elements
    • A61F2002/5073—Helical springs, e.g. having at least one helical spring

Definitions

  • Foot and leg prosthesis construction as commonly, known is inadequate.
  • Fig. l is a plan view of a prosthesis in accordance with the present invention.
  • Fig. 2 is a vertical section, on slightly larger scale, taken on a plane substantially indicated by line VIII, Fig. 1;
  • Fig. 3 is a transverse section taken substantially on line IX, Fig. 2;
  • Fig. 4 is a transverse section taken substantially on line X, Fig. 1;
  • Figs. 5, 6 and 7 are views generally analogous j-to Figs. 1, 2 and 4, showing a, slight modification.
  • a leg Dost L from a socket of any desired form is articulated to a foot plate made up of a steel plate 3 having some resiliency, and with cushioning rubber -4 forming a generally foot-like contour. Between the leg post and the foot plate are two joints. Articulating with the foot plate is an intermediate post portion 5 which has a forward extension 0 terminating in a cylindrical head 1 which is mounted in the assemblable bearingyll suitably secured to the plate 3.
  • the composite bearing allows assembly such that the ends of the cylindrical head!
  • leg post L Between the leg post L and the member 5 is a joint for limited rotation on a vertical axis. This may be formed for instance on the order of an assemblable joint with an extension head I2 integral with the member and of T-form.
  • the lower end of the leg post L is closed except for a transverse slot I 4 which is of dimensions to allow the T-head [2 to slide through when the foot plate is turned transversely.
  • assembly of the foot plate with its attached post-member 5 can have the T-head inserted through thereceiving slot I4 when in transverse position, and on then turning the foot plate back to normal toe-forward position the T-head l2 rides on the annular shoulder [5 of the lower end of the leg post L, and disengagement of this joint would be possible only if the foot were to be turned back transversely such as to register the T.-hea d 1-2 with the entry slot.
  • Such disassembly is prevented by a stop-screw l6 which may be set into position with stem and the intermediate member, a limit-screw set through a horizontal slot above said shoulder and the leg stem and into the T-head to limit the extent of rotary movement, a spring between the base of'said intermediate member and the subjacent cover plate, an arm extending forwardly from said leg stem over the foot-plate, an
  • anti-friction roller in the free end of said arm, and a spring with one end secured to the outer edge of the foot-plate and extending inunder said roller.
  • a leg stem, a footplate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion terminating in a diagonally oriented bearing member of generally cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a T-head extension at the top of said intermediate member, a shoulder in the lower end of the leg stem with partial interruption by a slot to receive said T-head when the foot-plate is turned transversely, thereby forming a rotary joint between the leg stem and the intermediate member, a limit-screw set through a horizontal slot above said shoulder and the leg stem and into the T-head to limit the extent of rotary movement, a spring between the base of said intermediate member and the subjacent cover plate, an arm extending forwardly of the leg stem axis allowing end movement with relation to the foot-plate and capable of transmitting pressure to the foot-plate in front of
  • a leg stem, a footplate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion terminating in a diagonally oriented bearing member of generally cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a T-head extension at the top of said intermediate member, a shoulder in the lower end of the leg stem with partial interruption by a slot to receive said T-head when the foot-plate is turned transversely, thereby forming a rotary joint between the leg stem and the intermediate member, a limit-screw set through a horizontal slot above said shoulder and the leg stem and into the T-head to limit the extent of rotary movement, a spring between the base of said intermediate member and the subjacent cover plate, an arm secured to the leg stem and extending forwardly over the footplate, and a spring with one end secured to the outer edge of the foot-plate and extending in
  • a leg stem, a footplate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion terminating in a diagonally oriented bearing member of generally cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a limited motion rotary joint between said leg stem and said intermediate member, an arm extending forwardly of the leg stem axis allowing independent movement with relation to the foot-plate and capable of transmitting pressure to the foot plate in front of the rocker joint when the leg stem inclines forward in locomotion, and a spring withone end secured to the outer edge of the foot plate and extending under-said forwardarm.
  • aleg'stem a footplate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion .terminating in a diagonally oriented bearing member of generally cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a limited motion rotary joint between said leg stem and said intermediate member, and an arm extending forwardly of the leg stem axis fo independent movement with relation to the foot-plate and transmission of pressure to the foot-plate in front of the rocker-joint when the leg stem inclines forward in locomotion.
  • a leg stem a. foot-plate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion terminating in a diagonally oriented bearing member of generaly cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a longitudinal slit in the forward end of said cover plate, and a rotary joint between said leg stem and said intermediate member including a T-head extension on said intermediate member and a shoulder in the lower end of the leg stem with partial interruption by a slot to receive said T-head when the foot-plate is turned transversely.
  • a leg stem at foot-plate, an intermediate member between said leg stem and said foot-plate, a rotary joint between the leg stern and intermediate member including a T-shaped head on the intermediate member and a shoulder in the adjacent end of the leg stem with partial interruption by a transverse slot to receive said T-shaped head when the foot-plate is turned transversely, and a limit screw to prevent disengagement and allow limited rotary movement.
  • a leg stem a foot-plate articulated to said leg stem by means including a rocker-joint, an arm extending forwardly of the leg stem axis allowing independent lateral movement with relation to the foot-plate and capable of transmitting pressure to the footplate in front of the rocker-joint when the leg stem inclines forward in locomotion, and a spring with one end secured to the outer edge of the foot-plate and extending transversely under the end of said forward arm adjacent the foot-plate.
  • a leg stem, a foot-plate, articulating means therebetween permitting relative movement of the forward end of the foot-plate upwardly and outwardly, and downwardly and inwardly, an arm extending for wardly of the leg stem axis allowing independent lateral movement with relation to the foot plate, and transverse spring means pressed by said arm in inward position and urging said arm out wardly on release.

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  • Health & Medical Sciences (AREA)
  • Transplantation (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Description

June 2, 1953 w. WISBRUN PROSTHESIS CONSTRUCTION Filed July 28, 1950 INVENTOR. \X/ALTEP \X/DDPUN BY 4 T TORNEYS Patented June 2, 1953 UNITED STATES PATENT OFFICE PROSTHESIS CONSTRUCTION Walter Wisb'ru'n, Cleveland Heights, Ohio Application J uly28, 1950, Serial N 0. 176,459
Foot and leg prosthesis construction as commonly, known is inadequate. First, it'does not take account of or accommodate to the peculiar rotating or oscillating motion which the leg performs in locomotion. Accordingly, friction of the stump in the socket is prone to cause discomfort. Second, it lacks capability to provide the throw or'centrifugalpower which is concerned in the effortless automatism and the gracefuhiess of thehuman gait. These defects have arisen from will appear from the following description.
To the accomplishment of the foregoing and related ends, the invention, then, comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.
In said annexed drawings:
Fig. l is a plan view of a prosthesis in accordance with the present invention;
Fig. 2 is a vertical section, on slightly larger scale, taken on a plane substantially indicated by line VIII, Fig. 1;
Fig. 3 is a transverse section taken substantially on line IX, Fig. 2;
1 Fig. 4 is a transverse section taken substantially on line X, Fig. 1; and
Figs. 5, 6 and 7 are views generally analogous j-to Figs. 1, 2 and 4, showing a, slight modification.
For an understanding of the invention it is necessary to first briefly refer. to some peculiarities of the anatomy of the foot. The peculiar components of the normal foot, which are essential .for the effortless and graceful character of the human gait, involve: First, upward and downvward rotation of the first metatarsal bone about the sagital axis of the sub-talar joint; second, rotation about the vertical axis of this articulation, creating centrifugal power; and third. ar-
rest of the centrifugal motion converting it into 11 Claims. (Cl. 3-6) propelling motion. These factors are taken account of in prosthesis construction, as illustrated, referring first to Figs. 1 1. Here, a leg Dost L from a socket of any desired form is articulated to a foot plate made up of a steel plate 3 having some resiliency, and with cushioning rubber -4 forming a generally foot-like contour. Between the leg post and the foot plate are two joints. Articulating with the foot plate is an intermediate post portion 5 which has a forward extension 0 terminating in a cylindrical head 1 which is mounted in the assemblable bearingyll suitably secured to the plate 3. The composite bearing allows assembly such that the ends of the cylindrical head! are, overhungbythe bearing structure and the joint is held against separation, while allowing a limited rocking motion of the foot plate on the member 5, within the limits of the cut-away margins of the plate 3 and bearing. It is to be especially noticed that a peculiarity of this joint is that it is diagonally oriented with respect to the toe-heel axis. That is, the outer end of the cylindrical head 1 is further forward than the medial or inner end. This peculiar orientation of the joint gives a result that when the foot plate is tipped down at the toe-end, it is also moved inwardly within the limits of the movement, and when the foot plate is-reversely rocked, the toe-end is thrown upwardly and outwardly. The importance of this will appear from the description further on. A spring I0 in a socket in the member 5 and bearing against the plate 3 thereunder, normally tends to urge the foot plate in the the toe-end in its elevated phase. V.
. Between the leg post L and the member 5 is a joint for limited rotation on a vertical axis. This may be formed for instance on the order of an assemblable joint with an extension head I2 integral with the member and of T-form. The lower end of the leg post L is closed except for a transverse slot I 4 which is of dimensions to allow the T-head [2 to slide through when the foot plate is turned transversely. Thus, assembly of the foot plate with its attached post-member 5 can have the T-head inserted through thereceiving slot I4 when in transverse position, and on then turning the foot plate back to normal toe-forward position the T-head l2 rides on the annular shoulder [5 of the lower end of the leg post L, and disengagement of this joint would be possible only if the foot were to be turned back transversely such as to register the T.-hea d 1-2 with the entry slot. Such disassembly is prevented by a stop-screw l6 which may be set into position with stem and the intermediate member, a limit-screw set through a horizontal slot above said shoulder and the leg stem and into the T-head to limit the extent of rotary movement, a spring between the base of'said intermediate member and the subjacent cover plate, an arm extending forwardly from said leg stem over the foot-plate, an
anti-friction roller in the free end of said arm, and a spring with one end secured to the outer edge of the foot-plate and extending inunder said roller.
3. In prosthesis construction, a leg stem, a footplate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion terminating in a diagonally oriented bearing member of generally cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a T-head extension at the top of said intermediate member, a shoulder in the lower end of the leg stem with partial interruption by a slot to receive said T-head when the foot-plate is turned transversely, thereby forming a rotary joint between the leg stem and the intermediate member, a limit-screw set through a horizontal slot above said shoulder and the leg stem and into the T-head to limit the extent of rotary movement, a spring between the base of said intermediate member and the subjacent cover plate, an arm extending forwardly of the leg stem axis allowing end movement with relation to the foot-plate and capable of transmitting pressure to the foot-plate in front of the rocker-joint when the leg stem inclines forward in locomotion, and a spring with one end secured to the outer edge of the foot-plate and extending in under said forward arm.
4. In prosthesis construction, a leg stem, a footplate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion terminating in a diagonally oriented bearing member of generally cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a T-head extension at the top of said intermediate member, a shoulder in the lower end of the leg stem with partial interruption by a slot to receive said T-head when the foot-plate is turned transversely, thereby forming a rotary joint between the leg stem and the intermediate member, a limit-screw set through a horizontal slot above said shoulder and the leg stem and into the T-head to limit the extent of rotary movement, a spring between the base of said intermediate member and the subjacent cover plate, an arm secured to the leg stem and extending forwardly over the footplate, and a spring with one end secured to the outer edge of the foot-plate and extending in under said forwardly extending arm.
5. In prosthesis construction, a leg stem, a footplate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion terminating in a diagonally oriented bearing member of generally cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a limited motion rotary joint between said leg stem and said intermediate member, an arm extending forwardly of the leg stem axis allowing independent movement with relation to the foot-plate and capable of transmitting pressure to the foot plate in front of the rocker joint when the leg stem inclines forward in locomotion, and a spring withone end secured to the outer edge of the foot plate and extending under-said forwardarm. w
6. In prosthesis construction,aleg'stem, a footplate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion .terminating in a diagonally oriented bearing member of generally cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a limited motion rotary joint between said leg stem and said intermediate member, and an arm extending forwardly of the leg stem axis fo independent movement with relation to the foot-plate and transmission of pressure to the foot-plate in front of the rocker-joint when the leg stem inclines forward in locomotion.
7. In prosthesis construction, a leg stem, a. foot-plate, an intermediate member between said leg stem and said foot-plate having a forwardly and downwardly extending portion terminating in a diagonally oriented bearing member of generaly cylindrical form, a receiving bearing overhanging the ends of the latter in the foot-plate and permitting limited rocking movement, a general cover plate on the foot-plate to which said receiving bearing is secured, a longitudinal slit in the forward end of said cover plate, and a rotary joint between said leg stem and said intermediate member including a T-head extension on said intermediate member and a shoulder in the lower end of the leg stem with partial interruption by a slot to receive said T-head when the foot-plate is turned transversely.
8. In prosthesis construction, a leg stem, at foot-plate, an intermediate member between said leg stem and said foot-plate, a rotary joint between the leg stern and intermediate member including a T-shaped head on the intermediate member and a shoulder in the adjacent end of the leg stem with partial interruption by a transverse slot to receive said T-shaped head when the foot-plate is turned transversely, and a limit screw to prevent disengagement and allow limited rotary movement.
9. In prosthesis construction, a leg stem, a foot-plate articulated to said leg stem by means including a rocker-joint, an arm extending forwardly of the leg stem axis allowing independent lateral movement with relation to the foot-plate and capable of transmitting pressure to the footplate in front of the rocker-joint when the leg stem inclines forward in locomotion, and a spring with one end secured to the outer edge of the foot-plate and extending transversely under the end of said forward arm adjacent the foot-plate.
10. In prosthesis construction, a leg stem, a foot-plate, articulating means therebetween permitting relative movement of the forward end of the foot-plate upwardly and outwardly, and downwardly and inwardly, an arm extending for wardly of the leg stem axis allowing independent lateral movement with relation to the foot plate, and transverse spring means pressed by said arm in inward position and urging said arm out wardly on release.
' Number 7 11. In p'r'osthetic construction; a, leg stem, a feet member ineluding a r'silieht steel plate having a longitudinal slit in its forward end separating spring sections unconnected other than 110 the said plate, and joint-means between said foot member and said leg stem.
WAL'I'ER WISBRUN;
References Cited in the file 0f fihi patent UNITED STATES PATENTS Name fifit 2,181,631 Thdifiiisfih Nev. 21, 1939 OTHER REFERENCES Terminal Researeh Reperts 1 on Artificial Limbs, by Gommittee on Artificial Limbs of the National Research; Council. Received in Div. 55 Neqember 13, @947, page 39 Fig. 42. A copy is 10 in Div"; 55 at the Patent Omee;
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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4892554A (en) * 1987-12-21 1990-01-09 Robinson David L Prosthetic foot
US5158570A (en) * 1991-05-10 1992-10-27 College Park Industries, Inc. Prosthetic foot with improved ankle and elastomeric heel pad
US5944760A (en) * 1997-08-04 1999-08-31 Roland J. Christensen Family Limited Partnership Prosthetic foot with reinforcing member
US6197068B1 (en) 1997-08-04 2001-03-06 Roland J. Christensen Prosthetic foot simulating toe rotation
US6241776B1 (en) 1997-08-04 2001-06-05 Roland Christensen Prosthetic foot with reinforcing member
US20030191541A1 (en) * 2000-08-30 2003-10-09 Phillips Van L. Energy storing foot prosthesis with improved plantar flexion
US6663673B2 (en) 2000-06-30 2003-12-16 Roland J. Christensen Prosthetic foot with energy transfer medium including variable viscosity fluid
US20040068326A1 (en) * 2002-10-08 2004-04-08 Christensen Roland J. Prosthetic foot with oblique attachment
US20040068327A1 (en) * 2002-10-08 2004-04-08 Christensen Roland J. 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
US20050033450A1 (en) * 2002-10-08 2005-02-10 Christensen Roland J. Prosthetic foot with a resilient ankle
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
US20050085926A1 (en) * 2003-10-21 2005-04-21 General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with an adjustable ankle and method
US20050171618A1 (en) * 2000-06-30 2005-08-04 Christensen Roland J. Prosthetic foot with energy transfer including variable orifice
US20050187640A1 (en) * 2004-02-20 2005-08-25 Roland J. Christensen Prosthetic foot with cam
US20050203640A1 (en) * 2002-10-08 2005-09-15 Christensen Roland J. Prosthetic foot with a resilient ankle
US20050216098A1 (en) * 2000-06-30 2005-09-29 Roland J. Christensen Variable resistance cell
US20060041321A1 (en) * 2003-10-21 2006-02-23 Christensen Roland J Prosthetic foot with an adjustable ankle and method
US20060229736A1 (en) * 2000-06-30 2006-10-12 Christensen Roland J Prosthetic foot with energy transfer
US20060241783A1 (en) * 2000-06-30 2006-10-26 Christensen Roland J Variable resistance cell
US20080033578A1 (en) * 2006-08-03 2008-02-07 Christensen Roland J Prosthetic foot with variable medial/lateral stiffness
US20080167731A1 (en) * 2006-12-06 2008-07-10 Christensen Roland J Prosthetic foot with longer upper forefoot and shorter lower forefoot
US20080183301A1 (en) * 2000-06-30 2008-07-31 Christensen Roland J Prosthetic foot with energy transfer
US20080188951A1 (en) * 2007-01-30 2008-08-07 Christensen Roland J Prosthetic foot with variable medial/lateral stiffness
US7462201B2 (en) 2003-10-21 2008-12-09 Freedom Innovations, Llc Prosthetic foot with an adjustable ankle and method
US20090082878A1 (en) * 2007-09-18 2009-03-26 Christensen Roland J Multi-axial prosthetic ankle
US20090265019A1 (en) * 2008-04-18 2009-10-22 Chritstensen Roland J 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
DE102016118834A1 (en) * 2016-07-20 2018-01-25 Andreas Radspieler Prosthetic foot and prosthesis for the lower extremity

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181031A (en) * 1937-08-26 1939-11-21 James C Thompson Artificial leg
US2475372A (en) * 1947-12-11 1949-07-05 John G Catranis Artificial foot(two-link)
US2475373A (en) * 1947-12-11 1949-07-05 John G Catranis Three-part artificial foot(lateral motion and ankle rotation)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181031A (en) * 1937-08-26 1939-11-21 James C Thompson Artificial leg
US2475372A (en) * 1947-12-11 1949-07-05 John G Catranis Artificial foot(two-link)
US2475373A (en) * 1947-12-11 1949-07-05 John G Catranis Three-part artificial foot(lateral motion and ankle rotation)

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4892554A (en) * 1987-12-21 1990-01-09 Robinson David L Prosthetic foot
US5158570A (en) * 1991-05-10 1992-10-27 College Park Industries, Inc. Prosthetic foot with improved ankle and elastomeric heel pad
US5944760A (en) * 1997-08-04 1999-08-31 Roland J. Christensen Family Limited Partnership Prosthetic foot with reinforcing member
US6197068B1 (en) 1997-08-04 2001-03-06 Roland J. Christensen Prosthetic foot simulating toe rotation
US6241776B1 (en) 1997-08-04 2001-06-05 Roland Christensen Prosthetic foot with reinforcing member
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
US7341603B2 (en) 2000-06-30 2008-03-11 Applied Composite Technology, Inc. Prosthetic foot with energy transfer including variable orifice
US20080183301A1 (en) * 2000-06-30 2008-07-31 Christensen Roland J Prosthetic foot with energy transfer
US20060241783A1 (en) * 2000-06-30 2006-10-26 Christensen Roland J Variable resistance cell
US20040133284A1 (en) * 2000-06-30 2004-07-08 Christensen Roland J. Prosthetic foot with energy transfer medium including variable viscosity fluid
US20060229736A1 (en) * 2000-06-30 2006-10-12 Christensen Roland J 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
US20050216098A1 (en) * 2000-06-30 2005-09-29 Roland J. Christensen 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
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
US20050171618A1 (en) * 2000-06-30 2005-08-04 Christensen Roland J. Prosthetic foot with energy transfer including variable orifice
US20030191541A1 (en) * 2000-08-30 2003-10-09 Phillips Van L. Energy storing foot prosthesis with improved plantar flexion
US7060104B2 (en) 2000-08-30 2006-06-13 Phillips Van L Energy storing foot prosthesis with improved plantar flexion
US20050033450A1 (en) * 2002-10-08 2005-02-10 Christensen Roland J. Prosthetic foot with a resilient ankle
US20050203640A1 (en) * 2002-10-08 2005-09-15 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
US6929665B2 (en) 2002-10-08 2005-08-16 Roland J. Christensen 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
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
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
US20060041321A1 (en) * 2003-10-21 2006-02-23 Christensen Roland J 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
US20050085926A1 (en) * 2003-10-21 2005-04-21 General Partner Of The Roland J. Christensen Family Limited Partnership 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
US7462201B2 (en) 2003-10-21 2008-12-09 Freedom Innovations, Llc Prosthetic foot with an adjustable ankle and method
US20050187640A1 (en) * 2004-02-20 2005-08-25 Roland J. Christensen Prosthetic foot with cam
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
US20080033578A1 (en) * 2006-08-03 2008-02-07 Christensen Roland J Prosthetic foot with variable medial/lateral stiffness
US7618464B2 (en) 2006-08-03 2009-11-17 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US20080167731A1 (en) * 2006-12-06 2008-07-10 Christensen Roland J Prosthetic foot with longer upper forefoot and shorter lower forefoot
US7824446B2 (en) 2006-12-06 2010-11-02 Freedom Innovations, Llc Prosthetic foot with longer upper forefoot and shorter lower forefoot
US20080188951A1 (en) * 2007-01-30 2008-08-07 Christensen Roland J Prosthetic foot with variable medial/lateral stiffness
US7727285B2 (en) 2007-01-30 2010-06-01 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US20090082878A1 (en) * 2007-09-18 2009-03-26 Christensen Roland J Multi-axial prosthetic ankle
US7794506B2 (en) 2007-09-18 2010-09-14 Freedom Innovations, Llc Multi-axial prosthetic ankle
US20090265019A1 (en) * 2008-04-18 2009-10-22 Chritstensen Roland J Prosthetic foot with two leaf-springs joined at heel and toe
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
DE102016118834A1 (en) * 2016-07-20 2018-01-25 Andreas Radspieler Prosthetic foot and prosthesis for the lower extremity

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