Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Leg – Ankle
Patent
1992-04-01
1995-04-11
Willse, David H.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Leg
Ankle
623 52, 403111, 403144, A61F 266
Patent
active
054054117
ABSTRACT:
An artifical ankle joint for use as an ankle between a foot prosthesis and leg prosthesis in an artificial limb. The artificial ankle joint includes a foot plate attached to a foot prosthesis, a leg plate attached to a leg prosthesis, a stem assembly and bearing assembly connected between the plates in which the bearing is a spherical bearing oriented vertically and including an inner race connected to the leg plate about an axis generally horizontal when the ankle joint is in use and an outer race connected with the stem assembly. Resilient structure extends between the plates for providing a degree of resistance to relative movement of the plates and includes a heel spring enclosing the stem assembly and a toe spring spaced from the heel spring with both the toe and heel springs extending between the plates. The stem includes a unitary or two piece unit anchored to the foot plate at one end and including a vertically disposed spherical bearing assembly connected to the leg plate at its other end to enable relative pivotal movement of the foot prosthesis in any angular direction with respect to the leg prosthesis and enabling limited swivelling movement of the foot prosthesis in relation to the leg prosthesis. This enables the articulated ankle to closely simulate all movement capabilities of a natural ankle.
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