Medio-lateral control enhancing, cantilever-spring type prosthet

Details Medio-lateral control enhancing, cantilever-spring type prosthet Medio-lateral control enhancing, cantilever-spring type prosthet

1991-05-06

1992-05-26

Green, Randall L.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Leg

Foot

623 53, A61F 266

Patent

active

051163853

ABSTRACT:
An improved prosthetic foot keel is proposed, based on the capability of the flexible keel to maintain the amputee's stability by means of medio-lateral forces and impulsions, while initially storing energy at heel strike and mid-stance, for restoring same at toe-off, in all planes. The keel is of the cantilever spring type, as generally disclosed in U.S. Pat. No. 4,645,509 to Poggi et al.. The improvement is directed: firstly, to a medially-oriented heel curvature which, at heel strike, provides medio-lateral stability during the weight transfer from the contra-lateral limb to the prosthetic limb; and secondly, to an inward medio-lateral forefront portion extension thereof which, by extending the lever arm of the deformable keel, produces a medio-lateral propulsion capability at foot push off. Hence, this keel medio-lateral heel curvature and inward extension facilitates lateral back and forth swinging motion of the amputee's body center of gravity, typical of a normal gait.

REFERENCES:
patent: 344154 (1886-06-01), Bartlette
patent: 456206 (1891-07-01), Rowley
patent: 4547913 (1985-10-01), Phillips
patent: 4645509 (1987-02-01), Poggi et al.
patent: 5004477 (1991-04-01), Palfray
patent: 5037444 (1991-08-01), Phillips
Burgess et al., Development and Preliminary Evaluation of the VA Seattle Foot, Journal of Rehabilitation Research & Development 22, 3, 75-84, Jul. 1985.

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