Method for ablating with needle electrode
First Claim
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1. A method for ablating tissue in or around the heart comprising:
- introducing into the heart a distal end of a catheter comprising a catheter body and, a needle electrode assembly at the distal end of the catheter body, the needle electrode assembly comprising a proximal tubing and distal tubing, wherein the proximal tubing is more flexible than the distal tubing, the distal tubing of the needle electrode assembly being in a retracted position within the distal end of the catheter;
introducing a distal end of the distal tubing of the needle electrode assembly into the tissue, including moving the distal tubing of the needle electrode assembly from its retracted position within the distal end of the catheter to an extended position outside the distal end of the catheter;
infusing into the tissue an electrically-conductive fluid through the distal tubing of the needle electrode assembly while in the extended position; and
ablating the tissue after and/or during introduction of the fluid into the tissue, whereby the fluid conducts ablation energy within the tissue to create a larger lesion than would be created without the introduction of the fluid.
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Abstract
A method for ablating tissue in or around the heart to create an enhanced lesion is provided. The distal end of a catheter including a needle electrode at its distal end is introduced into the heart. The distal end of the needle electrode is introduced into the tissue. An electrically-conductive fluid is infused through the needle electrode and into the tissue. The tissue is ablated after and/or during introduction of the fluid into the tissue. The fluid conducts ablation energy within the tissue to create a larger lesion than would be created without the introduction of the fluid.
223 Citations
42 Claims
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1. A method for ablating tissue in or around the heart comprising:
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introducing into the heart a distal end of a catheter comprising a catheter body and, a needle electrode assembly at the distal end of the catheter body, the needle electrode assembly comprising a proximal tubing and distal tubing, wherein the proximal tubing is more flexible than the distal tubing, the distal tubing of the needle electrode assembly being in a retracted position within the distal end of the catheter; introducing a distal end of the distal tubing of the needle electrode assembly into the tissue, including moving the distal tubing of the needle electrode assembly from its retracted position within the distal end of the catheter to an extended position outside the distal end of the catheter; infusing into the tissue an electrically-conductive fluid through the distal tubing of the needle electrode assembly while in the extended position; and ablating the tissue after and/or during introduction of the fluid into the tissue, whereby the fluid conducts ablation energy within the tissue to create a larger lesion than would be created without the introduction of the fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification