Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Leg – Knee
Patent
1994-01-21
1995-04-11
Willse, David H.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Leg
Knee
188314, 18832219, 267129, A61F 264, A61F 274
Patent
active
054054095
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 operating chamber which receives a piston mounted on a tubular piston rod. The housing and operating chamber receive hydraulic fluid or oil which flows during movement of the piston through fluid control ports, channels 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 into a displacement chamber and also produces variable forces for moving the piston rod outwardly to its extended position. An annular seal engages an inner portion of the piston rod and prevents the higher hydraulic pressure in the displacement chamber from transferring to the operating chamber and the annular seal between the housing and the outer portion of the piston rod.
REFERENCES:
patent: 2859451 (1958-11-01), Mauch
patent: 3151856 (1964-10-01), Bresk et al.
patent: 5092902 (1992-03-01), Adams et al.
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