Cup with cross-linked polymer layer
OwnerDerek James Wallace McMinninventor
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Abstract
This invention relates to a method of forming a polymer component and comprises blending polymer particles with antioxidant to form a mixture in which the antioxidant coats the polymer particles, irradiating the polymer particles to cross-link the polymer particles therein and forming the irradiated mixture into a consolidated component. The invention also relates to a method of forming an articular surface for a prosthesis and a prosthesis having a polymer articular bearing surface wherein at least one pre-determined portion of the bearing surface is provided with cross-linked polymer bonds.
Claims20
An acetabular cup prosthesis comprising an outer surface and an inner surface, wherein the center of the inner surface is displaced with respect to the outer surface so as to allow for an increased cup thickness in a pre-determined wear zone and wherein a cut-out is provided at an inferior edge of the cup to compensate for the displacement of the inner surface.
An acetabular cup prosthesis comprising a metal outer shell and a polymer inner liner, wherein the center of the polymer inner liner is displaced with respect to the metal outer shell so as to allow for an increased cup thickness in a pre-determined wear zone and wherein a cut-out is provided at an inferior edge of the cup to compensate for the displacement of the inner liner.
Dependencies are inferred from the claim text.