A device intended to be used to mechanically stop or interrupt the flow of blood in veins or arteries temporarily during vascular surgery and emergency trauma surgery. It is typically designed with a ring having a small portion left open so that it can be slipped over the blood vessel to be occluded, or it can have semicircular pivoted arms that can be opened and placed over the vessel with a latch to lock the arms once in place. The inner surface of this ring is lined with a soft-plastic balloon, or pair of balloons, inflated via a connecting tube using a standard syringe. This device facilitates occlusion with minimal trauma to the wall of the blood vessel. This is a single-use device.