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Anterior expandable spinal fusion cage system

  • US 6,835,206 B2
  • Filed: 05/13/2002
  • Issued: 12/28/2004
  • Est. Priority Date: 04/18/2000
  • Status: Expired due to Fees
First Claim
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1. An implant apparatus for positioning between adjacent vertebrae and comprising:

  • a) an anterior inserted fusion cage having a pair of legs interconnected at one end each by a posterior wall having a threaded bore, said legs having free ends opposite said wall, said cage being adapted for implanting between said adjacent vertebrae with outer surfaces of said legs engaging said vertebrae respectively;

    each of said leg free ends including a stop;

    b) an anterior expansion cap having a wedge member positioned between said free ends of said legs in such a manner that movement of said wedge member toward said wall urges said leg free ends apart;

    said wedge member having a base sized and shaped to engage said stops of said legs, so as to provide a fixed degree of expansion for said cage when inserted therein; and

    c) a fastener engaging said wedge member and extending between said wedge member and said wall;

    said fastener having a shank that is posteriorly threaded so as to be threadedly received in a threaded bore in said wall;

    said fastener being rotatable so as to advance in said bore to selectively urge said wedge member toward said wall.

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