Prosthetic ankle joint for pivotally connecting a residual limb to a prosthetic foot
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United States of America Patent
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-
Nov 5, 1996
Grant Date -
N/A
app pub date -
Jan 10, 1995
filing date -
Jan 10, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A prosthetic ankle joint includes a first joint structure having a foot attachment plate connecting a pair of spaced apart parallel fins lying in a sagital plane. A second joint structure having a pylon attachment plate is connected to a support block positioned between the fins of the first joint structure. The first and second joint structures are connected to each other by a spherical bearing that allows the joint structures to pivot with respect to each other about three orthogonal axes. The spherical bearing is connected to the first joint structure through an axle that extends through an aperture in the bearing. A rod extending from the bearing is threaded into a bore formed in the support block of the second joint structure. Dorsiflexion and plantar flexion cushions are positioned between the support block and respective surfaces of the first joint structure to resist pivotal dorsiflexal and plantar flexal pivotal movement of the ankle joint. Lateral cushions are positioned on opposite surfaces of the support block between the support block and respective fins to resist coronal and transverse pivotal movements of the ankle joint.
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