Myoelectrically controlled knee joint locking device

Details Myoelectrically controlled knee joint locking device Myoelectrically controlled knee joint locking device

1990-06-05

1991-11-05

Green, Randall L.

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

Having electrical actuator

Bioelectrical

623 43, 623 39, A61F 264, A61F 272

Patent

active

050628577

ABSTRACT:
A damped knee joint may be locked myoelectrically at any angle of flexing. A special hydraulic cylinder is pivoted above the knee center at one end and in the shank at the other end. This attachment strategy allows 110 degrees of knee flexion, permitting the normal range of sitting and standing positions. The cylinder assembly incorporates a closed loop, sealed hydraulic system and electro-mechanical valving to control piston position. The closed loop hydraulic system also prevents fluid leakage and contamination. Valving is accomplished by a microelectrically operated barrel or gate valve located in a hydraulic system. The use of a barrel or gate valve allows the microelectrically operated plunger to be physically isolated from the working fluid and to be operated reliably at the highest working pressure of the systems.

REFERENCES:
patent: 2619652 (1952-12-01), Vesper
patent: 2859451 (1958-11-01), Mauch
patent: 3316558 (1967-05-01), Mortensen
patent: 3501776 (1970-03-01), Beeker et al.
patent: 4441644 (1984-04-01), Farian
patent: 4854428 (1989-08-01), Horvath
S. C. Saxena et al., "E.M.G. Operated Electronic Artificial-Leg Controller", Medical & Biological Engineering & Computing, 9/77, pp. 553-557.
G. W. Horn, "Electro-Control:am EMG-Controlled A/K Prosthesis", Med. & Biol Engng., vol. 10, 1972, pp. 61-73.
Hensche-Mauch, Manual for the Henschke-Mauch "Hydraulik" Swing-N-Stance Control System (Type S-N-S), 2/76.

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