A catheter includes a first plurality of expandable leads and a second plurality of expandable leads separate and longitudinally spaced-apart from the first plurality to deliver energy to a hollow anatomical structure, such as vein, fallopian tube, hemorrhoid, esophageal varix, to effectively ligate...http://www.google.se/patents/US6682526?utm_source=gb-gplus-sharePatent US6682526 - Expandable catheter having two sets of electrodes, and method of use
