An ablation catheter used for treatment of, for example, atrial fibrillation by electrically isolating a vessel, such as a pulmonary vein, from a chamber, such as the left atrium. The ablation catheter has a virtual electrode and a catheter shaft. The virtual electrode comprises a porous conductor. The...http://www.google.se/patents/US20040143255?utm_source=gb-gplus-sharePatent US20040143255 - Ablation catheter having a virtual electrode comprising portholes and a porous conductor
