Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Leg – Foot
Patent
1991-12-23
1992-08-18
Green, Randall L.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Leg
Foot
623 50, 623 51, 623 52, A61F 266
Patent
active
051395258
ABSTRACT:
The invention relates to a prosthetic foot, including a hollow cosmesis (7) with a spring (1) fixed therein, and extending in the longitudinal direction of the foot for operative connection to an adapter (4) for connection to a leg prosthesis (5). The spring (1) is adapted to absorb energy on heel strike and to release this energy on toe-off. In accordance with the invention the spring (1) includes at least one spring element (8) which in the rear portion of the foot has a curved portion in a vertical direction, and a snubbing element in association with the curved spring portion or portions (15). The snubbing element (11) has at least one convex curved surface portion with a smaller curvature than the opposing inside of the curved spring portion (15), and is arranged such that when spring element (8) is deflected on loading the prosthetic foot, an increasing part thereof comes into engagement against surface portions of the snubbing element (11) with corresponding foreshortening of the free springing portion or portions of the spring element (8), to produce increased spring resistance to increased load on the foot.
REFERENCES:
patent: 694324 (1902-02-01), Peer
patent: 810180 (1906-01-01), Wintermute
patent: 827720 (1906-08-01), Erwin
patent: 2475372 (1949-07-01), Catranis
patent: 4413360 (1983-11-01), Lamb et al.
patent: 4959073 (1990-09-01), Merlette
Green Randall L.
Willse D.
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