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Method and instruments for percutaneous arthroscopic disc removal, bone biopsy and fixation of the vertebral

  • US 6,596,008 B1
  • Filed: 11/13/2000
  • Issued: 07/22/2003
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Term
First Claim
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1. A cannula assembly for use in arthroscopic spinal surgery comprising a cannula having a wall of uniform thickness, the wall defining a cylindrical inner passage having an oval cross section, and an obturator located within said cylindrical inner passage, the obturator having a cylindrical outer wall with an oval cross-section and closely fitting the cylindrical inner passage of the cannula.

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