Polycentric variable axis hinge for an orthopedic knee brace

Details Polycentric variable axis hinge for an orthopedic knee brace Polycentric variable axis hinge for an orthopedic knee brace

1995-01-03

1997-05-27

Apley, Richard J.

Surgery: splint, brace, or bandage

Orthopedic bandage

Splint or brace

602 16, 623 39, A61F 501

Patent

active

056327250

ABSTRACT:
A polycentric variable axis hinge for use in an orthopedic knee brace to provide a mechanical joint between the femoral and tibial cuffs of the brace. The hinge includes a femoral stem which is attached to the femoral cuff and which extends downwardly from the femoral cuff, and it also includes a tibial stem attached to the tibial cuff which extends upwardly from the tibial cuff. The ends of the two stems overlap one another to provide a joint. The action is such that angular movement of the stems relative to one another causes them to slide and rotate relative to one another to replicate the actual movement of the knee joint of the user as the leg is bent and straightened. The femoral and tibial stems have a 30 degree angulated shape so as to displace the joint of the hinge two-thirds of the distance from the patella to the rear of the knee to cause the hinge precisely to simulate the anatomical femoral arc in the human knee. The hinge is constructed to be relatively thin as compared to the prior art hinges and to be relatively light so as to optimize the comfort of the wearer. The hinge is also rugged in its construction.

REFERENCES:
patent: 4379463 (1983-04-01), Meier et al.
patent: 4723539 (1988-02-01), Townsend
patent: 4773404 (1988-09-01), Townsend
patent: 4890607 (1990-01-01), Townsend
patent: 5060640 (1991-10-01), Rasmusson
patent: 5230696 (1993-07-01), Silver et al.

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