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Trocar with improved universal seal

  • US 5,628,732 A
  • Filed: 01/19/1996
  • Issued: 05/13/1997
  • Est. Priority Date: 01/19/1996
  • Status: Expired due to Term
First Claim
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1. A trocar for providing access for insertion and withdrawal of surgical instruments to and from a surgical site within a body cavity, said trocar comprising:

  • a) a trocar cannula, said cannula having a cannula housing and a tubular sleeve extending therefrom, said cannula housing having a passageway communicating with said sleeve so as to create a path through said cannula for providing access for insertion and withdrawal of said surgical instruments; and

    b) a seal assembly affixed to said cannula housing in said path of said passageway, said seal assembly including a seal composed of an elastomeric material for sealing against said surgical instruments of varying diameter, said seal having a centrally located interior region containing an aperture therethrough, and a concentrically located sealing region, wherein said sealing region comprises an integral laminate co-molded from said elastomeric material, said laminate having a first underlying layer and a second overlaying layer, said first underlying layer having a hardness between about 5 Shore A Durometer Scale and about 40 Shore A Durometer Scale, and said second overlaying layer having a hardness between about 40 Shore A Durometer Scale and about 80 Shore D Durometer Scale.

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