Method and apparatus for spatially specific electrophysiological sensing in a catheter with an enlarged ablating electrode
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United States of America Patent
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Dec 3, 1996
Issued Date -
N/A
app pub date -
May 25, 1995
filing date -
Jan 8, 1993
priority date (Note) -
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Abstract
Orthogonal sensors, which are comprised of two or more electrodes and generally disposed circumferentially on the catheter at given longitudinal point along the catheter, receive signals which are differenced within a differential amplifier to produce a signal indicative only of the localized biopotential heart activity at a predetermined point in the myocardium. The orthogonal sensors are disposed in an ablative tip of the catheter to allow sensing of the localized cardiac activity which is adjacent to or in contact with the ablative tip during extirpation procedure or during the delivery of radio frequency energy during ablation. Sensing of the localized cardiac activity occurs simultaneously either with the ablation so that detailed and accurate electrocardiograms of the very tissue being ablated can be recorded.
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