1. A catheter comprising: an elongated catheter body； an idistal segment located distal to the catheter body and including at least two carriers, each carrier having a proximal end attached to the distal end of the catheter body, and a free distal end, each carrier containing: a support arm with shape memory； a non-conductive shell near the abutment regions support arm； at least one electrode； each of at least two carriers having a different length. The catheter according to claim 1, wherein at least one electrode is mounted at or near the distal end of the carrier and is electrically isolated from the support arm. The catheter according to claim 1, wherein the at least one electrode includes at least one ring electrode mounted in the vicinity of the abutment regions of the non-conductive sheath. The catheter of claim 1, wherein each support arm comprises nitinol. The catheter according to claim 1, in which the distal segment is able to move from an expanded state, in which each carrier radically leaves the catheter body in a folded state, in which each carrier is mainly located along the longitudinal axis of the catheter body. The catheter according to claim 5, in which, if the distal segment is deployed, each carrier projects radially outward from the catheter body and takes a curved shape. The catheter according to claim 5, wherein if the distal segment is not deployed, each carrier projects radially outward from the catheter body and takes the form of a substantially straight line. The catheter according to claim 1, wherein the distal ends are1. Катетер, содержащий:удлиненный корпус катетера； идистальный сегмент, расположенный дистальнее корпуса катетера и включающий по меньшей мере две несущие, причем каждая несущая имеет проксимальный конец, прикрепленный к дистальному концу корпуса катетера, и свободный дистальный конец,причем каждая несущая содержит:поддерживающий рычаг с памятью формы；непроводящую оболочку вблизи областей прилегания поддерживающего рычага；
