Endocardial dispersive electrode for use with a monopolar RF ablation pen
First Claim
1. A method for forming a lesion in a target tissue having a cavity within, the method comprising:
- providing a first RF electrode coupled to one pole of an RF current source;
providing a second RF electrode electrically coupled to the other pole of the RF current source, wherein the second RF electrode has an electrically conductive expandable surface defining an expandable interior volume;
inserting the second electrode into the tissue cavity;
expanding the interior volume of the second electrode such that the electrically conductive expandable surface contacts the target tissue from within the cavity; and
disposing the first electrode against the target tissue while applying RF current between the first and second electrodes to ablate the target tissue.
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Abstract
Methods and devices for forming a lesion in a target tissue having a cavity within. A first RF electrode and a second RF electrode can be coupled to opposite poles of an RF current source. The second electrode can be inserted into the tissue cavity and expanded to contact the target tissue from within. The first electrode can be externally disposed against the target tissue while applying RF current between the first and second electrodes to ablate the target tissue. Some methods are directed to ablating tribiculated atrial wall tissue to treat atrial fibrillation. The second electrode can contact the tribiculated tissue directly from within to provide a direct path between the two electrodes. In some methods, the second electrode is inserted through an incision made to remove an atrial appendage. The methods can provide deeper, narrower lesions relative to those made using remote, indifferent electrodes. Atrial fibrillation ablation procedures can be performed using the invention, requiring fewer incisions than conventional methods.
423 Citations
6 Claims
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1. A method for forming a lesion in a target tissue having a cavity within, the method comprising:
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providing a first RF electrode coupled to one pole of an RF current source; providing a second RF electrode electrically coupled to the other pole of the RF current source, wherein the second RF electrode has an electrically conductive expandable surface defining an expandable interior volume; inserting the second electrode into the tissue cavity; expanding the interior volume of the second electrode such that the electrically conductive expandable surface contacts the target tissue from within the cavity; and disposing the first electrode against the target tissue while applying RF current between the first and second electrodes to ablate the target tissue. - View Dependent Claims (2)
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3. A method for performing a maze procedure to treat atrial fibrillation by ablating atrial tissue to form at least one lesion in the atrial tissue, the method comprising:
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providing a first RF electrode coupled to one pole of an RF current source; providing a second RF electrode electrically coupled to the other pole of the RF current source; inserting the second electrode into the atrial chamber; and disposing the first electrode against the target tissue and drawing paths with the first electrode to form the maze lesions while applying RF current between the first and second electrodes to ablate the target tissue in a maze pattern, wherein the inserting is done through an incision made to remove the right atrial appendage. - View Dependent Claims (4, 5, 6)
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Specification