A device for anastomosing a pair of living vessels includes a ring having at least two integrally formed hooking protrusions and an integrally formed tab by which the surgeon positions the ring. The surgeon draws an end of a first vessel through the ring and impales the wall of the vessel on the protrusions,...http://www.google.co.uk/patents/US4593693?utm_source=gb-gplus-sharePatent US4593693 - Methods and apparatus for anastomosing living vessels
