Non-oxidizing polymeric medical implant

  • US 6,174,934 B1
  • Filed: 01/23/1998
  • Issued: 01/16/2001
  • Est. Priority Date: 06/01/1993
  • Status: Expired due to Fees
First Claim
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1. A medical implant comprising a formed ultra-high molecular weight polyethylene having a weight average molecular weight greater than 400,000, said material irradiated to create free radicals in the absence of a free radical generation catalyst while sealed by a layer of material whose function is to prevent said material from contact with oxygen in a concentration greater than 1% volume by volume and then heated at a temperature of greater than 25°

  • C. to create cross-links between free radicals while sealed within said layer for a sufficient time to create a level of cross-linking wherein the temperature and time are selected to be at least equivalent to heating said irradiated material at 50°

    C. for 144 hours as defined by the Arrhennius'"'"' equation (14).

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