System for controlling artificial knee joint action in an...

Details System for controlling artificial knee joint action in an... System for controlling artificial knee joint action in an...

A - Human Necessities

61

F

A61F 2/70 (2006.01) A61F 2/64 (2006.01) A61F 2/68 (2006.01) B62D 57/00 (2006.01) A61F 2/50 (2006.01) A61F 2/74 (2006.01) A61F 2/76 (2006.01)

Patent

CA 2057108

This invention relates to an above knee prosthesis which employs a hydraulic damper to passively regulate the angular velocity or rotation of the artificial knee joint. A programmed microprocessor recognizes common gait patterns from information received from bending moment strain and knee angle sensors on the prosthesis. The microprocessor, under the control of a rule-based program, reacts at various transition points in the gait by activating a motor which in turn adjusts a valve assembly in the damper. The valve assembly is capable of variably and separately damping the knee joint motion in each of flexion and extension at the same time. Gait is improved because of the improved extent of control of knee action. In addition, distinct routines such as stair descending and sitting down can also be practised.

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