Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Leg – Knee
Patent
1993-07-19
1994-12-27
Willse, David H.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Leg
Knee
623 46, A61F 264, A61F 274
Patent
active
053761375
ABSTRACT:
An artificial leg includes a knee mechanism having means for restricting knee flexing movement during the stance phase of the walking cycle. The restricting means includes a piston and cylinder assembly so coupled in the mechanism that the piston is movable in the cylinder with knee flexion and extension. The knee mechanism includes two chassis parts arranged to move relatively to each other when an axial load is applied to the limb. One end of the piston and cylinder assembly is connected to one of the chassis parts while the other chassis part engages a control member coupled to a valve inside the piston and cylinder assembly so that the valve is operated in response to relative load-dependent movements of the chassis parts in order to restrict the flow of fluid and thereby create resistance to knee flexion during the stance phase. The chassis parts are connected together by an anterior pivot joint and are resiliently moveable relative to each other according to applied load. The piston and cylinder assembly is also operable to resist movement during the swing phase of the walking cycle, and the interaction of the knee chassis parts with the control member is arranged so that movement of the member is reduced or does not occur at all for flexion angles greater than a predetermined value between 30.degree. and 40.degree..
REFERENCES:
patent: 2480856 (1949-09-01), Henschke et al.
patent: 2605474 (1952-08-01), Oliver
patent: 2619652 (1952-12-01), Vesper
patent: 2859451 (1958-11-01), Mauch
patent: 4065815 (1978-01-01), Sen-Jung
patent: 5092902 (1992-03-01), Adams et al.
Paul C. Klopsteg and Philip E. Wilson, "Human Limbs and Their Substitutes", pp. 481, 541-545, 581-587, Hafner Publishing Company, 1968.
Cross-sectional drawing of "S-N-S" Hydraulic knee control system of Mauch Laboratories, Inc.
Edwards Peter D.
Shorter John J.
Woolnough Vic J.
Chas. A. Blatchford & Sons Limited
Willse David H.
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