Johnson & Johnson Professional, Inc.

Robert C Hurlburt

Michael J O'Neil

Gerald J Cicierega

Frank D Matthews

Robert S Brown

An augmentation system for an implantable bone prosthesis, such as a femoral component of a knee joint prosthesis, includes an augmenting block having an aperture disposed therein. A collet having an expandable distal end, extending beyond one surface of the augmenting block, is positioned within the aperture. The proximal end of the collet includes a threaded cavity that receives a set screw which is adapted to communicate with the collet to expand and contract the collet. The distal end of the collet is adapted to fit within a mounting cavity of a joint prosthesis. With the augmenting block placed on the appropriate surface of the joint prosthesis, the distal end of the collet is positioned within the mounting cavity. Tightening of the set screw causes the distal end of the collet to expand, thus frictionally and/or mechanically engaging the interior walls of the mounting cavity to firmly secure the augmenting system to the prosthesis.

Augmentation device for joint prosthesis

An augmentation system for an implantable bone prosthesis, such as a femoral component of a knee joint prosthesis, includes an augmenting block having an aperture disposed therein. A collet having an expandable distal end, extending beyond one surface of the augmenting block, is positioned within the aperture. The proximal end of the collet includes a cavity that receives an expansion pin that is adapted to communicate with the collet to expand the collet. The distal end of the collet is adapted to fit within a mounting cavity of a joint prosthesis. With the augmenting block placed on the appropriate surface of the joint prosthesis, the distal end of the collet is positioned within the mounting cavity. Advancement of the expansion pin causes the distal end of the collet to expand, thus frictionally and/or mechanically engaging the interior walls of the mounting cavity to firmly secure the augmenting system to the prosthesis. The expansion pin can include threads which mate with corresponding threads within the cavity of the collet. Alternatively, the pin and collet cavity can include ratchet and pawl-like surface features.

Joint prosthesis augmentation system

A knee prosthesis includes a femoral component, a patella insert, a tibial bearing insert, a tibial tray and a reinforcement pin. The reinforcement pin is constructed such that it includes a ribbed region comprised of one or more circumferentially oriented ribs. The diameter of the ribbed region of the pin exceeds that of the non-ribbed region of the pin. The reinforcement pin is adapted to seat within a bore formed in the tibial bearing insert in an interference fit. A distal portion of the pin protrudes from the inferior surface of the tibial bearing insert and is adapted to fit, in a clearance fit, within a bore formed in a superior surface of the tibial tray.

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Whitman, MA, United States of America

Robert C Hurlburt