Abstract: A device for cutting venous valves includes a support member adapted to be inserted into a vein and having a fore, rounded insertion end and a rear end provided with valve cutters, the valve cutters having a cutting edge or edges extending substantially transversely to the member and being directed in the backward direction of the support member to cut venous valves when the support member is moved in the backward direction. A possibly branched fluid duct extends from an inlet centrally disposed at the rear end of the support member to at least one outlet located ahead of the valve cutters, and the inlet is connected or connectable to a fluid supply through an at least slightly flexible conduit.