Prosthetic knee joint

Details Prosthetic knee joint Prosthetic knee joint

1975-06-13

1977-02-01

Frinks, Ronald L.

3 22, 3 29, 3 2, A61F 104, A61F 108

Patent

active

040054969

ABSTRACT:
A prosthetic knee joint having a femoral member and a tibial member each of which is provided with a bearing surface. The bearing surface of the tibial member supports the bearing surface associated with the femoral member such that flexion between the tibial member and the femoral member causes the respective bearing surfaces to roll relative to one another. Rollers, cam surfaces and guide slots are provided to ensure the retention of the proper relationship for this rolling contact between the tibial bearing surface and the femoral bearing surface. The knee joint includes a mechanical brake which produces a brake force that increased with flexure between the tibial member and the femoral member. The brake includes a resilient deformable element which transmits a brake applying force to a brake shoe which is operable along an axis generally perpendicular to the direction in which the force is applied. Hyperextension of the knee joint is mechanically limited and a torsion rod accommodates torsional motion between the knee joint and a lower leg to which it may be attached. The knee joint also includes a member which simulates the movement of the patella bone of a human knee.

REFERENCES:
patent: 50770 (1865-10-01), Lockwood
patent: 1431292 (1922-10-01), Dilworth
patent: 2046069 (1936-06-01), Greissinger
patent: 3351955 (1967-11-01), Middleton
patent: 3723997 (1973-04-01), Kolman
patent: 3731323 (1973-05-01), Glancy
"Human Limbs & Their Substitutes" by Klopsteg & Wilson et al., McGraw-Hill Book Co., Inc., 1954, pp. 499-502, relied upon.

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