Artificial head assembly for an articulated joint between...

Details Artificial head assembly for an articulated joint between... Artificial head assembly for an articulated joint between...

A - Human Necessities

61

F

3/104

A61F 2/36 (2006.01) F16C 11/06 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01) A61F 2/46 (2006.01)

Patent

CA 1061951

ABSTRACT OF THE DISCLOSURE An artificial head assembly for a human femur consists of the head portion proper and a metal pin. The head portion is a sintered ceramic ball having a polished contact face of convex, spherical curvature and a blind bore tapering conical- ly inward toward the contact face. The pin is shaped for insert- ion of one end into the hollow stump of the femur, the other end tapering conically at the same apex angle as the bore in the ball. A knurling of the conical face of the pin reduces the compressive strength of the pin surface to less than the tensile strength of the ball so that the assembled head and pin can be sterilized without cracking the ceramic head port- ion because of differences in coefficients of thermal expans- ion between the metal and the ceramic material.

238449

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