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Coaxial needle and severing snare

  • US 5,961,526 A
  • Filed: 02/18/1998
  • Issued: 10/05/1999
  • Est. Priority Date: 02/18/1998
  • Status: Expired due to Term
First Claim
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1. A device for treating a lesion within a living body, comprising:

  • a sheath extending from a proximal end which, in an operative position, is located outside the body, to a distal end which, in the operative position is located within the body;

    a fluid injection needle having a tissue piercing tip at a distal end thereof and a fluid injection port at a proximal end thereof, the fluid injection needle extending through the sheath and defining a central lumen which extends from the fluid injection port to the tissue piercing tip;

    a snare extending within the central lumen to a loop formed in a distal end of the snare;

    a needle actuator for moving the fluid injection needle between a retracted position in which the distal tip is received within the sheath to an injection position in which the distal tip extends distally beyond a distal end of the sheath; and

    a snare actuator for moving the snare between a covered position in which the loop is received within the central lumen and an extended position in which the loop extends distally from the central lumen beyond the distal tip.

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