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Safety trocar

  • US 5,066,288 A
  • Filed: 06/27/1989
  • Issued: 11/19/1991
  • Est. Priority Date: 07/06/1988
  • Status: Expired due to Term
First Claim
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1. A trocar including a trocar tube having a proximal and a distal end, an obturator having a perforating tip and extendable through the tube to perforate tissue at the distal end of the tube, said perforating tip having a three-sided pyramidal shape, and containing three cutting edges, and further including a safety shield extendable to shield the tip of the obturator, said safety shield exhibiting a rounded distal end with a slot for passage of said obturator tip therethorugh, said slot bounded by three distally extending semicircular lobes formed on the distal end of said shield, such that the proximal ends of said lobes oppose each other on either side of said cutting edges while said obturator tip is extended through said slot, and said slot generally conforming to the geometry of said obturator tip such that each of said semicircular lobes fit against said obturator tip while entering the perforation created by the tip to spread the perforation.

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