Endocardial mapping and ablation system for introduction into a chamber of a heart formed by a wall and having a passage leading thereto. The system is comprised of a catheter probe having a distal extremity. A plurality of electrodes are carried by the distal extremity for mapping the wall of the chamber....http://www.google.ca/patents/US5782899?utm_source=gb-gplus-sharePatent US5782899 - Endocardial mapping and ablation system utilizing a separately controlled ablation catheter and method 
