Patent ID: 11970600
Assignee: THE GENERAL HOSPITAL CORPORATION
Field: Medical technology (Instruments)
Classification: CPC C  A | IPC A  C

Claim 9:
10. A wear resistant medical implant fabricated from peroxide crosslinked ultra-high molecular weight polyethylene containing vitamin-E, wherein ultra-high molecular weight polyethylene is first blended with di-cumyl peroxide and vitamin E to form a blend, wherein the blend is compression molded to obtain a crosslinked and consolidated preform and cooled to about room temperature, wherein the crosslinked and consolidated preform is subjected to a high temperature melting (HTM) cycle in a reduced oxygen environment to produce a peroxide cross-linked and high temperature melted polymeric preform, wherein the peroxide cross-linked and high temperature melted polymeric preform has an acetophenone (ACP) index less than 0.03 and an elongation at break (EAB) less than 400%, wherein the peroxide cross-linked and high temperature melted polymeric preform is machined into a medical implant,
wherein the high temperature melting cycle comprises heating the crosslinked and consolidated preform above 250° C. for at least 50 hours and less than 70 hours, wherein during the heating the crosslinked and consolidated preform is heated at 295±5° C. for a duration that is not longer than 9 hours.