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Endocardial dispersive electrode for use with a monopolar RF ablation pen

  • US 7,497,857 B2
  • Filed: 04/29/2003
  • Issued: 03/03/2009
  • Est. Priority Date: 04/29/2003
  • Status: Expired due to Fees
First Claim
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1. A method for forming a lesion in cardiac tissue, the method comprising:

  • providing a first RF electrode coupled to a RF current source;

    providing a second RF electrode electrically coupled to form a current path for the first RF electrode, wherein the second RF electrode includes an electrically conductive envelope surface defining an interior volume within, wherein the envelope has a first, unexpanded configuration and a second, expanded configuration, wherein the second configuration has an interior volume greater that the first configuration interior volume;

    making an incision in a heart chamber wall;

    inserting the second electrode through the incision and into the heart chamber interior;

    expanding the second electrode conductive surface to the second configuration to contact a target region of the heart chamber endocardium; and

    disposing the first electrode against the target region epicardium while applying RF current between the first and second electrodes.

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