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What is a tourniquet? A tourniquet is a device used to reduce the blood flow to a limb in the event of life-threatening bleeding. The overall purpose of the tourniquet is to prevent the body from losing too much blood. The tourniquet applies pressure to the limb which limits the blood flow to the affected area.

A tourniquet is a device that is used to apply pressure to a limb or extremity in order to limit, but not stop the flow of blood. It may be used in emergencies, in surgery, or in post-operative rehabilitation. Proper application of a tourniquet will partially impede venous blood flow back toward the heart and cause the blood to temporarily pool in the vein so the vein is more prominent and the blood is more easily obtained.