1981-04-15
1982-11-30
Frinks, Ronald L.
3 7, A61F 104, A61F 108
Patent
active
043609317
ABSTRACT:
A prosthetic ankle for use between the ankle block forming the bottom end of a prosthetic lower leg, and a prosthetic foot, comprising a securing bolt extending upwardly through a hole in the foot and screwed into a nut in the ankle block. Under the head of the bolt are two cupped washers that provide a ball-and-socket connection which allows angular movement of the ankle block in all directions with respect to the foot, as well as rotational movement. A pad of elastomeric material is interposed between the top surface of the foot and the bottom surface of the ankle block, and is cemented to the top surface of the foot. The pad is of a thickness and hardness such that when the ankle block is leaned in any direction, the elastomeric material on the inside of the lean is compressed. Pins project downwardly from the bottom surface of the ankle block and are received in cavities in the elastomer. When a torsional stress is exerted on the ankle block, the pins exert a torsional in the elastomer. When the torsional stress is released, the elasticity of the elastomer causes the foot to be returned to the straight-ahead position.
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Crowe John H.
Frinks Ronald L.
Kidder Herbert E.
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