Method and system for radiofrequency ablation of tissue

Details Method and system for radiofrequency ablation of tissue Method and system for radiofrequency ablation of tissue

1994-01-10

1996-07-30

Pellegrino, Stephen C.

Surgery

Instruments

Electrical application

606 1, 606 42, 606 45, 606 31, 607101, 607102, A61B 1736

Patent

active

055406815

ABSTRACT:
A system for delivering radiofrequency energy to ablate tissue comprises a radiofrequency generator and an intravascular catheter. The catheter includes both a radiofrequency ablation electrode and a temperature sensor within its distal end. Delivery of power to the ablation electrode may then be controlled based on electrode temperature using a cascade control system wherein analog temperature controller adjusts the set point to a secondary power controller. Alternatively, power delivered to the patient can be controlled directly based on a power set point. A sinusoidal RF signal is provided to avoid energy attenuation and the sinusoidal RF signal may be pulsed to avoid buildup of coagulum on the catheter tip while providing high power to create large lesions. A verification circuit checks the continuity of circuits in the catheter.

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