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Surgical trocars having optical tips defining one or more viewing ports

  • US 5,445,142 A
  • Filed: 03/15/1994
  • Issued: 08/29/1995
  • Est. Priority Date: 03/15/1994
  • Status: Expired due to Term
First Claim
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1. A surgical apparatus for inserting a cannula through tissue defining a wall of a body cavity, said surgical apparatus comprising:

  • a hollow axially elongated tube having a proximal end and a distal end;

    a substantially solid optically clear tip, said tip having a distal cutting end and a proximal base end secured to said distal end of said tube and including an axial bore extending from its proximal base end to its distal cutting end;

    a viewing rod positioned within said axial bore of said tip, said viewing rod having a proximal end defining a viewing port at said proximal base end of said tip and a distal end defining a window at said distal cutting end of said tip for collecting light which is carried to said viewing port by said viewing rod; and

    a cutting element disposed at the distal end of said tip for cutting said tissue for insertion of a cannula through said tissue into said body cavity, said cutting element comprising;

    at least one electrode disposed at said distal cutting end of said tip; and

    at least one electrical conductor extending from said proximal end of said tube to said distal end of said tube, said at least one electrical conductor being connected to said at least one electrode for conducting high frequency energy thereto for electrosurgically cutting said tissue to insert a cannula through said tissue into said body cavity.

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