26/07/2024
It is not a tourniquet if it does not have a windlass.
A tourniquet is a constricting band placed around a limb and tightened to eliminate arterial flow past the device. Simply tying a constricting band tightly around a limb rarely provides enough pressure to occlude arterial flow. To stop bleeding requires a mechanical advantage, and to obtain that advantage you need a windlass or twist stick to tighten the constricting material. Arterial flow into the limb is a high-pressure system and requires high pressure deep in the limb to occlude or stop its flow. Venous flow is a low-pressure system taking blood from the limb and returning it back to the body and requires less pressure to stop its progress.
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