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Multiple electrode ablation apparatus

  • US 5,536,267 A
  • Filed: 08/12/1994
  • Issued: 07/16/1996
  • Est. Priority Date: 11/08/1993
  • Status: Expired due to Term
First Claim
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1. A tissue ablation apparatus, comprising:

  • a delivery catheter with a distal end and a proximal end;

    a handle attached to the proximal end of the delivery catheter;

    an electrode deployment device positioned at least partially in the delivery catheter and including a plurality of retractable electrodes that are inserted into tissue, penetrate tissue and surround a selected mass, each electrode having a non-deployed state when positioned within the delivery catheter, and a distended deployed state when advanced from the distal end of the delivery catheter defining an ablation volume between the deployed electrodes, each deployed electrode having at least two radii of curvature when advanced through the distal end of the delivery catheter and positioned at a desired tissue site; and

    an electrode advancement and retraction member connected to the electrode deployment device, for advancing the electrodes in and out of the delivery catheter distal end.

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