Tourniquet
A tourniquet was a device, often improvised, used to cut off blood flow to an injured limb. 

In 2372, B'Elanna Torres compared Automated Unit 3947's power depletion to a bleeding artery, saying she didn't have a tourniquet. ()

In 2373, Miles O'Brien told a badly injured Enrique Muniz that he would "tighten this bandage like a tourniquet" if he didn't stop complaining about the first aid the engineer was providing to him. ()

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Medical equipment