Surgery – Instruments – Electrical application
Patent
1997-05-06
1999-02-09
Cohen, Lee
Surgery
Instruments
Electrical application
606 33, 606 41, 600374, 607 99, A61B 1739
Patent
active
058687378
ABSTRACT:
A catheter for use in an electrophysiological procedure to ablate a site includes a metallic tip having a first work function and energized by a source of RF energy. The RF energy return path is through a relatively large plate of a metallic material having a second work function and disposed at a location removed from the ablation site. The difference in work functions of the tip and the plate, operating in the presence of an electrolyte represented by intermediate tissue, produces an exchange of electrical charges through chemical reaction to create a galvanic cell. By loading the galvanic cell with a shunt resistor, it becomes a current source providing a current signal having a peak value representative of occurrence of tissue damage. This representation is used to regulate the RF energy applied to the ablation site.
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Acker Loren C.
Taylor Junius E.
Cohen Lee
Engineering & Research Associates, Inc.
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