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Trocar and cannula assembly

  • US 5,246,425 A
  • Filed: 09/21/1992
  • Issued: 09/21/1993
  • Est. Priority Date: 09/21/1992
  • Status: Expired due to Term
First Claim
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1. A trocar and cannula assembly for guarding against accidental puncture wounds of a patient or medical personnel, which comprisesa hollow cannula having an open end;

  • a trocar member adapted to be removably inserted through the cannula so to expose a piercing apex through the cannula'"'"'s open end, the trocar member having a substantially cylindrical shank terminating in the piercing apex;

    the piercing apex comprising a tip, a sloping side wall providing a contoured profile and sufficient surface area to create a smooth transition between the tip and the trocar'"'"'s shank, and a plurality of openings in the side wall surrounding the tip;

    a trocar tip protector housed within the trocar member and adapted to actuate between a retracted and an extended position, the tip protector having a plurality of projections, each projection adapted to pass through one of the openings in the piercing apex, to surround the tip in the extended position; and

    means to actuate the tip protector into an extended position;

    wherein once the tip of the trocar member has entered a patient'"'"'s body cavity and before the piercing apex has been fully inserted, the tip protector is actuated into an extended position to surround the tip and guard against accidental puncture.

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