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Cutting instrument

  • US 7,485,125 B2
  • Filed: 12/17/2001
  • Issued: 02/03/2009
  • Est. Priority Date: 12/17/2001
  • Status: Expired due to Term
First Claim
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1. A cutting instrument, comprising:

  • an outer member having an opening at least partially bounded by a sharp cutting edge; and

    a helical knife coupled to the outer member for rotation relative to the outer member, the helical knife having a flat surface at a distal end of the helical knife, the helical knife having an edge configured to slice into tough, fibrous tissue, the edge of the helical knife extending through the opening such that, during use, the edge slices into tough, fibrous tissue to draw the tough, fibrous tissue proximally along the helical knife towards the sharp cutting edge, the helical knife edge being arranged relative to the cutting edge such that the edges align in a plane substantially perpendicular to a longitudinal axis of the instrument to create a shearing action therebetween.

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