Exemplary embodiments are directed to providing a method of preparing an anatomical vessel contained within a tissue bundle for ligation, including positioning a cannula adjacent to the tissue bundle, wherein the positioning is non-penetrating, the cannula including a first extendable member, a second...http://www.google.co.uk/patents/US7141057?utm_source=gb-gplus-sharePatent US7141057 - Doppler directed suture ligation device and method
