Lowelimb prothesis

Details Lowelimb prothesis Lowelimb prothesis

1989-03-03

1992-05-26

Green, Randall L.

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

Leg

Ankle

623 50, 623 53, 623 55, A61F 266

Patent

active

051163837

ABSTRACT:
In a lower limb prothesis an energy storing foot (10) is combined with a resilient ankle joint (13) which is arranged to allow plantar flexion but substantially to prevent dorsi-flexion. The ankle joint (13) comprises a ball and socket joint (42), the socket (44) of which is extended downwardly on the anterior, medial and lateral sides to form a skirt (44A) positioned so as to compress a resilient ring (54) encircling a ball member (46) of the ball and socket joint (42). Metal plates (56) are embedded in the anterior part of the ring to prevent significant dorsi-flexion. The foot (10) has a single-piece carbon fiber reinforced plastics keel (12) having a lower spring portion (12B) connected at its posterior end as a cantilever to an upper ankle mounting portion (12). The resilient of the foot (10) is adjustable by means of a transversely extending support bar (28) which can be moved longitudinally by rotating an adjusting screw (30). The screw (30) passes through an aperture in the keel (12) and is accessible at the rear of the heel.

REFERENCES:
patent: 1112819 (1914-10-01), McFarland
patent: 4461045 (1984-07-01), Shorter et al.
patent: 4499613 (1985-02-01), Yarrow
patent: 4645508 (1987-02-01), Shorter
patent: 4645509 (1987-02-01), Poggi et al.
patent: 4652266 (1987-03-01), Truesdell

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