A ring applicator device and method for applying an elastic occluding ring to an anatomical tubular structure which comprises an inner cylinder slidably disposed within an outer cylinder, forceps means slidably disposed within said inner cylinder, and means for moving said forceps means into and out...http://www.google.co.uk/patents/US4374523?utm_source=gb-gplus-sharePatent US4374523 - Occlusion ring applicator
