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Expandable intervertebral fusion implant having improved stability

  • US 6,332,895 B1
  • Filed: 03/08/2000
  • Issued: 12/25/2001
  • Est. Priority Date: 03/08/2000
  • Status: Expired due to Term
First Claim
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1. An expandable intervertebral fusion implant comprisinga pair of shells adapted to be assembled to form a hollow body, each of said shells comprising an arcuate central portion, a pair of wings extending in opposite directions from opposite edges of said central portion, and a pair of parallel side walls extending in a common direction from respective outer edges of the wings, and means on the shells for permitting unidirectional expansion of the implant from a retracted initial height to an expanded installed height, wherein each of said wings has a width equal to at least 20% of that of the implant.

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