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Self contained gas powered surgical apparatus

  • US 5,711,472 A
  • Filed: 05/16/1994
  • Issued: 01/27/1998
  • Est. Priority Date: 10/18/1991
  • Status: Expired due to Term
First Claim
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1. In a surgical apparatus of the type having a handle assembly, a body portion extending from the handle assembly, a tool assembly having a longitudinal axis and supported at the distal end of the body portion, and a pneumatic system located on a proximal end of the apparatus, the pneumatic system including a piston with a piston head portion disposed in a drive cylinder and adapted for application of pneumatic force thereto, the improvement wherein said piston head portion has an elliptical configuration and is positioned within said drive cylinder which has opposed proximal and distal end portions and a complementary operative elliptical transverse cross-sectional configuration, the drive cylinder having a longitudinal axis substantially parallel to the longitudinal axis of the tool assembly wherein the pistol head portion is pneumatically actuated to translate from the distal end portion of the drive cylinder away from the tool assembly and towards the proximal end portion of the drive cylinder and is spring biased towards the distal end portion of the drive cylinder.

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