Es wird ein Katheter (1) vorgeschlagen der zur kryochirurgischen und/oder elektrischen Ablation geeignet ist. Gleichzeitig kann nach dem Veröden mit Hilfe eines Elektrodenpaars (29) kontrolliert werden, ob die Ablation erfolgreich war.The catheter (1) has a guide sleeve (3) and a thrust wire which is connected with a plug (17) of a balloon (11) which comprises protruded portion in filled state. An expandable container portion arranged in radial direction at a distal end of catheter, comprises several bars (27) in which a pair of electrodes (29,31) or one electrode is arranged. Several spacers (5,7) moved in the catheter are electrically connected with the electrodes.
