Surgery – Instruments – Electrical application
Patent
1998-12-01
2000-09-05
Cohen, Lee
Surgery
Instruments
Electrical application
606 38, 606 41, 600374, 607 99, A61B 1812, A61B 5042
Patent
active
061135925
ABSTRACT:
During an ablation procedure in a chamber of the heart RF energy is used to form a myocardial lesion for treatment of some arrhythmias such as sustained supraventricular tachycardia and accessory pathways. A galvanic cell, formed by a metallic electrode having a first work function at the ablation site, a second metallic electrode having a second work function located remote from the ablation site and the intervening tissue serving as an electrolyte, produces an output current signal reflective of the formation of a lesion at the ablation site and is used to control the RF energy applied. A curve depicting the output current signal has a maximum value at the point a burn or lesion begins and thereafter begins to decrease in value. A short duration inflection or bump of the curve occurs prior to charring and carbonization of the lesion and predicts lesion formation of a sufficient depth. Thereafter, RF energy should no longer be applied to prevent unnecessary damage to the myocardial tissue. The bump in the curve serves as an accurate indicator to a physician of successful formation of the lesion.
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Cohen Lee
Engineering & Research Associates, Inc.
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