Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1999-01-07
2000-11-28
Millian, V.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 2035, A61F 238
Patent
active
061529605
ABSTRACT:
A femoral component of a knee prosthesis includes a bearing surface defined by a smooth, continuous surface which in one embodiment is entirely formed by a series of three segments of surfaces of revolution, the respective shapes of which are generated by rotating a common generating curve around three separate generating axes at respective pairs of major generating radii and through respective angles of rotation. The central segment of the surfaces of revolution constantly maintains the substantially same contact configuration with the superior bearing surface of a bearing insert over a range extending from full extension (0.degree. of flexion) to at least 45.degree. of flexion and up to 105.degree. of flexion. The maintenance of the substantially same contact configuration ensures area, point or line contact between the articulating surfaces which reduces contact stress and wear in flexion. In a second embodiment, the bearing surface is defined by four segments of surfaces of revolution shaped for implantation in a knee where one or both cruciate ligaments are retained.
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Biomedical Engineering Trust I
Casella Anthony J.
Hespos Gerald E.
Millian V.
Porco Michael J.
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