An improved valve cutter for in-situ incision of valve leaflets which safely, efficiently, and consistently renders venous valves incompetent while minimizing frictional forces on the endothelium of the vessel and preventing inadvertent contact between cutting surfaces and the intima of the vein wall....http://www.google.es/patents/US5601580?utm_source=gb-gplus-sharePatente US5601580 - Venous valve cutter
