# US 4,395,783 A · Method of making an artificial leg

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- Number: US 4,395,783 A
- Document ID: US4395783A
- Status: Granted
- Kind: A
- Application number: 06/283,865
- Filed: 1981-07-16
- Granted: 1983-08-02
- Earliest claimed: 1980-07-16
- Assignees: Vessa Limited
- Inventors: Harry Eyre; James A. Wood
- Web page: https://patentgrep.com/patent/US4395783A

## CPC

- A61F 2/60: Artificial legs or feet or parts thereof
- A61F 2/6607: {Ankle joints}
- A61F 2002/30433: {using additional screws, bolts, dowels, rivets or washers e.g. connecting screws}
- A61F 2002/5007: {having elastic means different from springs, e.g. including an elastomeric insert}
- A61F 2002/5055: {Reinforcing prostheses by embedding particles or fibres during moulding or dipping, e.g. carbon fibre composites}
- A61F 2220/0041: using additional screws, bolts, dowels or rivets, e.g. connecting screws
- 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 (dental prosthetics A61C)

## Abstract

An artificial leg is assembled from a thigh member and a selected one of a plurality of preformed modular endoskeletal shin members each having an identical knee support member and ankle attachment member but differing in length of shin tube. A cellular plastics cosmesis is moulded onto the shin member. A foot may be attached to the shin member with an intermediate disc bearing differentially spaced circumferential teeth on its upper and lower faces which locate in sockets in the ankle attachment member and in the foot to permit fine adjustment of the position of the foot relative to the shin member.

## Claims

### Claim 1

An assembly of a shin member and foot for an artificial leg having a disc sandwiched between said shin member and foot, the upper face of the disc and the shin member locating by engagement of a first set of circumferentially spaced teeth in a first corresponding set of sockets and the lower face of the disc and the foot locating by engagement of a second set of circumferentially spaced teeth in a second corresponding set of sockets, said second set of teeth having a different angular spacing from said first set of teeth to permit the making of fine adjustments in the positions of said shin member and foot relative to one another, and a bolt passing through a hole in said disc and locating in an internally threaded anchorage point at the base of the shin member to secure the foot to the shin member against movement longitudinally apart whereby the foot is located in a fixed predetermined angular position relative to the shin member.

### Claim 2 (depends on 1)

An assembly according to claim 1, wherein the foot comprises a keel member of rigid material moulded into a body of cellular plastics material, an ankle base member above the keel member and fixed to the shin member, and transverse pivot means interconnecting the keel member and the ankle base member.