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...http://www.google.ca/patents/US5540681?utm_source=gb-gplus-sharePatent US5540681 - Method and system for radiofrequency ablation of tissue