Seal assembly for access device

  • US 5,782,812 A
  • Filed: 06/07/1995
  • Issued: 07/21/1998
  • Est. Priority Date: 07/02/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A combination, comprising:

  • a trocar having a working channel extending between a distal end and a proximal end, the trocar being adapted for disposition across a body wall;

    a valve disposed in the working channel of the trocar;

    an instrument sized and configured for insertion into the working channel of the trocar and through the valve, insertion of the instrument through the valve resulting in friction forces which inhibit movement of the instrument in the working channel of the trocar;

    the valve including a first wall and a second wall intersecting the first wall, the first and second walls having a proximally facing surface with a combined area;

    portions of the first wall and the second wall defining a contact surface in proximity to the intersection of the first wall and second wall, the contact surface having an area less than the combined area of the first wall and second wall and providing substantially the only contact between the instrument and the valve as the instrument is inserted into the working channel;

    wherebythe reduced area of the contact surface significantly lowers the friction forces, thereby facilitating movement of the instrument through the working channel.

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