A multiplicity of high frequency electrodes in a cluster configuration may be inserted into tissue of a patient's body for producing heat ablation of abnormal tissue such as a tumor. The electrodes are connected coherently to the voltage output of a high frequency generator. An enlarged ablation volume...http://www.google.es/patents/US6530922?utm_source=gb-gplus-sharePatente US6530922 - Cluster ablation electrode system
