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Seal members for surgical trocars

  • US 5,545,142 A
  • Filed: 04/12/1993
  • Issued: 08/13/1996
  • Est. Priority Date: 10/18/1991
  • Status: Expired due to Term
First Claim
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1. A trocar assembly for providing communication into an anatomical cavity, comprising:

  • (a) a trocar tube defining an interior lumen having an open distal end portion and an open proximal end portion for accommodating axial movement of an elongate instrument of lesser cross-sectional dimension therethrough;

    (b) a housing adjoining said proximal end portion of said trocar tube defining a chamber having open distal and proximal end portions that communicate with said lumen and permit axial movement of an elongate instrument therethrough; and

    (c) an elastomeric seal member positioned in said chamber for sealing said proximal end portion of said chamber, said seal member having an inner section and an outer section, said inner section having an opening formed therein for permitting an elongate instrument to pass therethrough in sealing engagement therewith, said inner section having a plurality of spaced apart projections extending outwardly from a proximally facing surface of said inner section to reduce surface contact with an elongate instrument inserted into said housing means through said opening in said seal member, said seal member having a corrugated portion formed in said outer section in surrounding relationship with said opening so as to maintain the sealing engagement with an elongate instrument during off-centering of an instrument with respect to said seal member.

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