PROBLEM TO BE SOLVED: To provide pulmonary catheters for ablation and tissue diagnostics.SOLUTION: The catheter allows mapping and/or ablation of an area around two or more PV ostia at the same time, with a single placement of a distal section 15 of the catheter having a 2D configuration resembling an infinity or lazy eight symbol. The catheter has an elongated catheter body 12, a distal section having at least a flexible elongated member with shape memory, the member being configured to assume a 2D configuration resembling an infinity symbol, and at least one electrode mounted on the member. The 2D configuration resembles a first loop and a second loop, where the first and second loops are side-by-side, generally extending in a common plane.
