Knee joint prosthesis

Details Knee joint prosthesis Knee joint prosthesis

2004-12-02

2009-10-06

Snow, Bruce E (Department: 3738)

Prosthesis (i.e., artificial body members), parts thereof, or ai

Leg

Knee

Reexamination Certificate

active

07597716

ABSTRACT:
The invention relates to a knee joint prosthesis comprising two arched guiding elements (3, 4) with a variable curvature in a first body (1) associated with the thigh, bolts (6, 7), or the like, of a second body (2) associated with the lower leg engaging in said guiding elements. The points XP(φ), YP(φ) of one guiding element (3) and the points XQ(φ) and YQ(φ) of the other guiding element (4) correspond approximately to the following equations: XP(φ)=A1×φ5+B1×φ4+C1×φ3+D1×φ2+E1×φ−F1; YP(φ)=A2×φ5+B2×φ4+C2×φ3+D2×φ2+E2×φ−F2; XQ(φ)=A3×φ5+B3×φ4+C3×φ3+D3×φ2+E3×φ−F3; YQ(φ)=A4×φ5+B4×φ4+C4×φ3+D4×φ2+E4×φ−F3, the deflection angle f of the knee joint being indicated in radians. The inventive knee joint prosthesis enables a significant adaptation to the natural movement.

REFERENCES:
patent: 1390915 (1921-09-01), Loth

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