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Surgical trocar and spike assembly

  • US 5,224,951 A
  • Filed: 02/19/1991
  • Issued: 07/06/1993
  • Est. Priority Date: 02/19/1991
  • Status: Expired due to Term
First Claim
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1. A surgical trocar instrument, comprising:

  • an elongated trocar tubular housing having a first open end portion for positioning through a body wall and a second opposite open end portion for introduction and removal of auxiliary surgical devices therethrough while said first open end portion is positioned through the body wall;

    an elongate trocar spike assembly concentrically insertable through said second open end and comprising a cylindrical housing including an inboard end and an outboard open end extendable through said second opposite open end of said trocar housing, said cylindrical housing defining an elliptical configuration terminating in a sharp needle point at the outboard-most end of said cylindrical housing; and

    coring prevention means received within said cylindrical housing and biased for extension outboard of said needle point for urging solid material interior of said body wall away from said needle point and said open end of said cylindrical housing while said cylindrical housing is moved through said solid material interior of said body wall, and means for applying a concentric bias between said cylindrical housing and said coring prevention means, wherein said coring prevention means includes a plow-shaped end extending through said open end of said cylindrical housing.

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