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Intervertebral disk arthroplasty

  • US 5,258,031 A
  • Filed: 12/14/1992
  • Issued: 11/02/1993
  • Est. Priority Date: 01/06/1992
  • Status: Expired due to Term
First Claim
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1. An intervertebral disk arthroplasty adapted to replace a disk between a first vertebra and a second vertebra in the spine, said arthroplasty comprising:

  • a first member engaging the first vertebra having a first joint surface, a first posterior end and a first anterior end, said ends defining a transverse midline therebetween, said midline being equidistant from said first anterior end and said first posterior end;

    a second member for engaging the second vertebra having a second joint surface facing said first joint surface, and second posterior and anterior ends juxtaposed with corresponding ends of said first posterior and anterior ends;

    a ball and socket joint between said first and second members defined in said first and second joint surfaces and disposed between said midline and said first posterior end, said ball and socket joint configured to permit relative rotation between said first member and said second member about a first axis parallel to said transverse midline and a second axis perpendicular to said first axis and lying in a saggittal plane.

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