Prosthetic leg with a hydraulic control

Details Prosthetic leg with a hydraulic control Prosthetic leg with a hydraulic control

1978-11-16

1980-07-15

Frinks, Ronald L.

Brakes

Wheel

Transversely movable

3 22, 188313, A61F 100, A61F 108

Patent

active

042120870

ABSTRACT:
The hydraulic knee control for a prosthetic leg has a cylinder and piston assembly. In addition, within the cylinder is disposed a free floating plug so that the space between the free plug and the head end is filled with air or a compressible fluid, and the spaces between the free plug and the crank end is filled with a liquid or hydraulic fluid. The piston is disposed within this liquid and has sealing means which prevents the liquid from bypassing therearound. Disposed outside of the cylinder are two bypass passageways wherein one end of each passageway communicates with the cylinder in the region between the piston and crank end and the other end of each passageway communicates with the cylinder in the region between the piston and the floating plug. One of the passageways has a one-way adjustable valve which allows the liquid to move only from the head end to the crank end in a controlled manner, and the other passageway has a one-way adjustable valve which allows the liquid to move only from the crank end to the head end in a controlled manner.

REFERENCES:
patent: 2568051 (1951-09-01), Catranis
patent: 3316558 (1967-05-01), Mortensen
patent: 3670341 (1972-06-01), Webb et al.
patent: 3920253 (1975-11-01), Bauer
"UC-BL Pneumatic Swing-Control Unit for Above-Knee Prostheses" by C. W. Radcliffe et al., Bulletin of Prosthetic Research, Fall, 1960, pp. 73-83, 88 & 89.

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