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The ordinary piece of rubber tubing used as a tourniquet in intravenous medication and drawing of blood samples has certain disadvantages. As it is commonly used, the binding loop forms an undesirable bulging against the skin, it is released with a jerk that is apt to cause the needle to leave the vein, and it takes some care to keep the free ends from the sterile field.
The running bow line tourniquet consists of the usual rubber tubing with a 2 or 3 inch loop at one end. This can be made with a heavy rubber band or by sewing.
The open end is slipped through the loop so as to form a running bow line just above the elbow. Traction is exerted on both ends, and the loop is pushed down snugly against the arm and released. It will hold firmly. Steady pressure against the loop with the thumb
Forsbeck FC. RUNNING BOW LINE TOURNIQUET. JAMA. 1925;85(13):974. doi:10.1001/jama.1925.26710130002010b