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Hydrogel arthroplasty device

  • US 9,387,082 B2
  • Filed: 02/24/2014
  • Issued: 07/12/2016
  • Est. Priority Date: 10/05/2004
  • Status: Active Grant
First Claim
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1. A cartilage replacement prosthesis having a first surface and a lubricious second surface, the prosthesis comprising a covalently cross-linked polyacrylic acid network and a polyurethane network, the polyacrylic acid network forming a composition gradient within the polyurethane network such that the polyacrylic acid content of the prosthesis is at a maximum at the second surface and decreases with distance from the second surface towards the first surface, the prosthesis comprising polyurethane at all distances from the second surface to the first surface, the prosthesis comprising water, wherein the water forms a continuous hydration gradient within the polyacrylic acid network and the polyurethane network.

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