RADIOFREQUENCY ABLATION SYSTEM

摘要

A system for delivering radiofrequency energy to ablate tissue comprises a radiofrequency generator and an intravascular catheter. The catheter includes a radiofrequency ablation electrode and a temperature sensor within its distal end and may also include an additional electrode for ECG endocavitary mapping, or HIS. Delivery of power to the ablation monopolar electrode may then be controlled based on electrode temperature using a cascade feedback 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 a disposal catheter.