A method and apparatus for ablation of body tissue. A catheter provided with a hollow needle is employed both for mapping the location to be ablated by injection of an excitability reducing agent and for ablating tissue, employing RF energy in conjunction with an injected, conductive fluid....http://www.google.ca/patents/US5725524?utm_source=gb-gplus-sharePatent US5725524 - Apparatus for R-F ablation
