Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Leg – Ankle
Reexamination Certificate
2000-03-16
2001-09-18
Snow, Bruce (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Leg
Ankle
C623S055000
Reexamination Certificate
active
06290730
ABSTRACT:
BACKGROUND OF THE INVENTION
Many biomechanical systems or prostheses are known that assist an amputee in walking, running, and performing other types of locomotion. One known type of artificial foot and ankle is disclosed in U.S. Pat. No. 5,376,139, the disclosure of which is incorporated by reference herein. This prosthetic device provides contacting cam rolling surfaces and elastic connections that more closely imitate the forces on the foot during locomotion.
SUMMARY OF THE INVENTION
The present invention relates to an artificial foot and ankle based on the principles of operation of the artificial foot and ankle in the above noted U.S. Pat. No. 5,376,139. The artificial foot and ankle includes a keel component, an ankle component, and a central bumper component interposed between the keel component and the ankle component. The ankle component has a lower surface with a radius of curvature greater than the radius of curvature of an upper surface of the keel component in both a sagittal plane and a frontal plane. The curvature of the central bumper component corresponds to the curvature of the keel component. In this way, the ankle component is capable of a rolling motion over the central bumper component and the keel component.
A holding assembly holds the keel component, the ankle component, and the central bumper component together. The holding assembly comprises a generally U-shaped member disposed along medial and lateral sides and a bottom surface of the keel component and along medial and lateral sides of the central bumper component. A pin extends between upper ends of the U-shaped member and is disposed through an opening in the ankle component, whereby the ankle component is capable of rotation about the pin. The pin may be adjustable on the U-shaped member to provide a desired amount of motion of the foot and ankle.
A dorsiflexion stop assembly may also be provided to control the amount of dorsiflexion. The dorsiflexion stop assembly comprises a strap member extending through corresponding openings in the keel component and the central bumper component and attached to a dorsiflexion rod adjustably mounted at the anterior of the ankle component to provide a tension adjustment of the strap member. A compressible strap bumper may be disposed within a loop of the strap member to provide a gradual dorsiflexion stop.
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patent: 1134045 (1968-11-01), None
patent: 2110936 (1983-06-01), None
patent: WO 89/05617 (1989-06-01), None
“Synthesis of a cycloidal mechanism of the prosthetic ankle”, M.R. Pitkin,Prosthetic and Orthotics International,1996, 20, 159-171.
Colvin James M.
Hays John A.
Pitkin Mark R.
Srinivasan Sujatha
Ohio Willow Wood Company
Snow Bruce
Weingarten, Schurgin Gagnebin & Hayes LLP
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