Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Having fluid actuator
Patent
1991-08-09
1992-03-03
Green, Randall L.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Having fluid actuator
623 44, 92 84, 92110, A61F 264, A61F 274
Patent
active
050929020
ABSTRACT:
A prosthetic leg has a pivotal knee joint and a hydraulic fluid control unit connected to provide variable forces which dampen flexion and extension of the knee and also bias the leg to its extended position. The unit includes an aluminum housing lined with an axially adjustable sleeve and control bushing defining a cylindrical chamber which receives a piston mounted on a tubular piston rod. The housing and chamber receive hydraulic fluid or oil which flows during movement of the piston through fluid control ports, channel and adjustable gaps defined by the sleeve and bushing for damping the movement of the rod. The piston rod encloses a gas filled flexible bladder which forms an oil accumulator during inward movement of the piston rod and also produces variable forces for moving the piston rod outwardly to its extended position. The housing confines a gap defining ring which compensates for changes in oil viscosity with heat.
REFERENCES:
patent: 2859451 (1958-11-01), Mauch
patent: 3316558 (1967-05-01), Mortensen
patent: 4065815 (1978-01-01), Sen-Jung
patent: 4212087 (1980-07-01), Mortensen
patent: 4578082 (1986-03-01), Sen-Jung
patent: 4595179 (1986-06-01), Glabiszewski
patent: 4662486 (1987-05-01), Stenberg
patent: 4880213 (1989-11-01), Shinbori et al.
Adams Thomas C.
Wiggins Lanny K.
Green Randall L.
Mauch Laboratories, Inc.
Willse David H.
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