A catheter includes a plurality of primary leads to deliver energy for ligating a hollow anatomical structure. Each of the primary leads includes an electrode located at the working end of the catheter. Separation is maintained between the primary leads such that each primary lead can individually receive...http://www.google.co.uk/patents/US6200312?utm_source=gb-gplus-sharePatent US6200312 - Expandable vein ligator catheter having multiple electrode leads
