The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 1996
Filed:
Jun. 06, 1994
Todd S Johnson, Fort Wayne, IN (US);
Kevin M Greig, Leesburg, IN (US);
Zimmer, Inc., Warsaw, IN (US);
Abstract
A knee joint prosthesis includes femoral and tibial components. The femoral component has a cam located near the upper extreme of the posterior condyles and substantially flush with the inside surface of the posterior condyles. The prosthesis is characterized by low cam and spine contact which reduces the stress on the components and improves their subluxation resistance. The tibial component has a posteriorly located spine to engage the femoral cam and a relief groove to accommodate the femoral cam. This allows the cam to remain low on the tibial spine and even go below the edges of the tibial component. Cam chamfers, where the femoral cam attaches to the posterior condyles of the femoral component, further facilitate cam clearance. The cam chamfers and relief groove cooperate in flexion to allow at least 12 degrees of rotation, both clockwise and counterclockwise, of the femoral component with respect to the tibial component around the axis of the spine.