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Catheter for RF ablation with cooled electrode and method

  • US 5,658,278 A
  • Filed: 01/31/1995
  • Issued: 08/19/1997
  • Est. Priority Date: 12/01/1992
  • Status: Expired due to Term
First Claim
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1. A method for creating a lesion in tissue having blood therein and having a surface by the use of an impervious metal conducting electrode having a chamber therein comprising bringing the electrode into contact with the surface of the tissue to form an electrode-surface interface, supplying radio frequency energy at a predetermined power level in excess of 10 watts to the inpervious metal conducting electrode to cause heating of the tissue in the vicinity of the surface contacted by the impervious metal conducting electrode, cooling the impervious metal conducting electrode with a cooling liquid delivered into the chamber so that the temperature in the tissue does not reach a temperature in excess of approximately 95°

  • C. and thereby inhibiting coagulation of blood on the impervious metal conducting electrode and making possible the formation of a wide and deep lesion in the tissue.

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