A tip electrode for an ablation catheter mounted at the distal tip of an elongated catheter body member has a distal-end region and a proximal-end region. A tip thermal sensor is located at or near the apex of the distal-end region and one or more side thermal sensors are located near the surface of...http://www.google.com.au/patents/US6312425?utm_source=gb-gplus-sharePatent US6312425 - RF ablation catheter tip electrode with multiple thermal sensors
