An RF ablation system comprises irrigated split tip electrode catheter, an RF generator and a signal processor. The catheter comprises four orthogonally arranged electrodes at the distal tip. The catheter is used to map the electrical activity of a heart chamber to locate site(s) of aberrant electrical...http://www.google.com.au/patents/US6217574?utm_source=gb-gplus-sharePatent US6217574 - System and method for measuring subsurface temperature of tissue during ablation
