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Incising trocar and cannula assembly

  • US 5,522,831 A
  • Filed: 06/13/1994
  • Issued: 06/04/1996
  • Est. Priority Date: 06/13/1994
  • Status: Expired due to Fees
First Claim
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1. A combination incising trocar and cannula instrument for incising the walls of a body cavity and inserting the cannula through the walls into the cavity comprising:

  • a trocar including a trocar housing, an incising blade mechanism including an incising blade, a blade drive means positioned in said trocar housing for driving the blade through body tissue and a trigger for operating said blade drive means;

    said blade drive means including a drive spring, an annular spring guide supporting said drive spring and having an annular driving surface and annular flange formed thereon;

    a blade drive shaft having an end cooperating with said annular driving surface for driving said blade drive shaft;

    said annular spring guide and said drive spring being centrally positioned within said trocar housing and concentric with said blade drive shaft;

    said trigger including an actuating finger for engaging said annular flange of said annular spring guide for moving said annular spring guide to compress said drive spring when said trigger is actuated;

    whereby continued movement of said trigger disengages said actuating finger from said annular flange of said spring guide causing said spring to decompress and drive said driving surface of said spring guide against said end of said blade drive shaft propelling said incising blade forwardly to incise body tissue; and

    a cannula having a cannula housing in alignment with said trocar housing, a cylindrical sleeve with a central opening extending from the cannula housing for insertion into the body cavity, and a sealing assembly for creating a seal between said cannula and said trocar during an incising procedure and creating a seal in said cannula thereafter when the trocar is removed.

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