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Threaded fusion cage with enhanced anterior support

  • US 6,666,888 B1
  • Filed: 08/23/2000
  • Issued: 12/23/2003
  • Est. Priority Date: 08/23/2000
  • Status: Active Grant
First Claim
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1. A spinal fusion cage for implantation between a pair of vertebra;

  • said cage comprising;

    a) an elongate body having semi-circular surfaces on opposite sides thereof that are sized and shaped such that each of said surfaces is adapted to engage a respective vertebra when positioned therebetween;

    b) each of said surfaces including a portion of a radially outward extending thread for engaging a respective vertebra;

    c) said thread having a generally constant major diameter and a variable minor diameter;

    said thread minor diameter increasing uniformly along a length of said thread and approaching said major diameter near an anterior end of said cage so as to reduce thread depth and to provide greater support to the anterior end of vertebrae during usage.

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