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Ablation catheter and method for isolating a pulmonary vein

  • US 6,325,797 B1
  • Filed: 04/05/1999
  • Issued: 12/04/2001
  • Est. Priority Date: 04/05/1999
  • Status: Expired due to Term
First Claim
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1. A method for forming an ablation pattern to electrically isolate a vessel having an ostium from a chamber formed within a patient for treatment of cardiac arrhythmia, the method including:

  • selecting a catheter assembly comprising a catheter body defining a longitudinal axis and having a proximal portion and a distal portion, the distal portion forming a substantially closed loop transverse to the longitudinal axis, the loop defining a loop axis that is aligned with the longitudinal axis, and at least one electrode displayed along the distal portion;

    guiding the distal portion into the chamber;

    directing the distal portion to a position spaced from the vessel ostium, whereby the loop axis is substantially aligned with a center of the vessel ostium;

    advancing the distal portion in a direction parallel with the loop axis such that the loop contacts the chamber wall about the vessel ostium; and

    energizing the electrode to ablate a continuous, closed lesion pattern about the vessel ostium to electrically isolate the vessel from the chamber.

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