Artificial head assembly for an articulated joint between two bo

Details Artificial head assembly for an articulated joint between two bo Artificial head assembly for an articulated joint between two bo

1975-10-29

1977-03-22

Frinks, Ronald L.

Surgery

Truss

Pad

3 1913, 128 92CA, A61F 124

Patent

active

040127958

ABSTRACT:
An artificial head assembly for a human femur consists of the head portion roper 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 conically inward toward the contact face. The pin is shaped for insertion 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 portion because of differences in coefficients of thermal expansion between the metal and the ceramic material.

REFERENCES:
patent: 3894297 (1975-07-01), Mittelmeier et al.

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