Patent ID: 9156963
Filing Date: 2015-10-13
Classification: A61F,A61L,C08F,C08J,C08K,G03G

Abstract:
1. A process for preparing crosslinked oxidation resistant UHMWPE for use in medical prostheses comprising the steps of: (i) obtaining UHMWPE resin; (ii) crosslinking the UHMWPE, (iii) combining the UHMWPE resin with both a first amount of a first additive and a second amount of a second additive, wherein the first and the second additives are different additives; (iv) consolidating the crosslinked UHMWPE that has been combined with the first and second additives to create oxidation resistant UHMWPE, wherein the first and second additives synergistically increase the oxidation resistance of the crosslinked UHMWPE, and wherein the amount of the first additive that is combined with the UHMWPE in step (iii) is about 50 ppm to about 2,000 ppm, and wherein the amount of the second additive that is combined with the UHMWPE in step (iii) is about 50 ppm to about 2,000 ppm.