Harder-softer hard substance articulation for arthroplasty

摘要

Hard substance wear couple has materials of differing hardness forming surfaces for articulation in a joint implant prosthesis. For instance, a first articulating body can have a convex articulating surface, and a second articulating body can have a corresponding concave articulating surface that can articulate with the convex articulating surface of the first articulating body, in which the convex articulating surface of the first articulating body is harder than the corresponding concave articulating surface of the second articulating body. Ceramic materials are preferred.

主权项

1. A hard substance wear couple, for a joint implant prosthesis, which comprises:
a first zirconia ceramic containing articulating body for articulation on a second zirconia ceramic containing articulating body; and the second zirconia ceramic containing articulating body;wherein:
the first and second zirconia ceramic containing articulating bodies are of differing hardness and include respective first and second zirconia articulating surfaces for articulation in the wear couple in a joint implant prosthesis, which thus also are of differing hardness; an MgO-TTZ ceramic makes up both of the first and second articulating bodies such that MgO-TTZ articulates against MgO-TTZ; and the hard substance wear couple is useful in or as the joint implant prosthesis—and wherein the first articulating body has a convex articulating surface, and the second articulating body has a corresponding concave articulating surface that can articulate with the convex articulating surface of the first articulating body, wherein, the convex articulating surface of the first articulating body is harder than the corresponding concave articulating surface of the second articulating body, and wherein the first articulating body embraces the first zirconia containing articulating body, and the second articulating body embraces the second zirconia containing articulating body.