System and method for assessing electrode-tissue contact and lesion quality during RF ablation by measurement of conduction time
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United States of America Patent
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Jul 13, 2004
Grant Date -
Mar 20, 2003
app pub date -
Sep 18, 2001
filing date -
Sep 18, 2001
priority date (Note) -
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Abstract
The efficacy of a lesion produced between a pair of ablation electrodes is assessed by analyzing the time it takes for a pulse of energy to travel from one electrode to the other. During a first time period, a first pulse of energy is applied to a first electrode. The time it takes for the pulse to conduct through the tissue to a second electrode is determined. During a time period subsequent to the first time, a subsequent pulse of energy is applied to the first electrode and the time it takes for the subsequent pulse to conduct through the tissue to the second electrode is determined. Changes in the conduction times are monitored by calculating the difference between consecutive conduction times and comparing the difference to a preset value. If the difference is below the preset value the lesion is considered adequate.
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