Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1997-11-14
1999-03-02
Isabella, David J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 20, 623 22, A61F 232
Patent
active
058764569
ABSTRACT:
An implantable orthopedic prosthesis includes a prosthetic component, such as an acetabular shell or tibial baseplate, having a wall. The wall has a first surface for engaging bone and a second surface. The wall defines a hole therethrough extending from the second surface to the first surface. A portion of the hole is oval cylindrical. A plug is provide having a portion that is also oval cylindrical. Each of the oval portions of the hole and plug have respective major and minor transverse axes. The oval cylindrical portion of the plug is sized to fit without interference within the oval portion of the hole if the respective major and minor axes of plug and hole are substantially aligned. The oval portion of the plug fits in locked interference within the oval portion of the hole if the respective major and minor axes of the plug and hole are substantially misaligned. The plug can be freely inserted into and removed from the hole with the respective major and minor axes of the plug and hole substantially aligned. The plug can be interference-locked in the hole by rotating the plug relative to the hole to render the respective major and minor axes of the plug and hole substantially misaligned.
REFERENCES:
patent: 4955325 (1990-09-01), Zarnowski et al.
patent: 5314487 (1994-05-01), Schryver et al.
patent: 5549691 (1996-08-01), Harwin
patent: 5571198 (1996-11-01), Drucker et al.
patent: 5782929 (1998-07-01), Sederholm
Bachmayer Eric N.
Morgan Mack D.
Ritter Robin L.
Sederholm Gary W.
Barrow Kenneth S.
Isabella David J.
Sulzer Orthopedics Inc.
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