This invention made amputation much safer, which cut down on the number of people who died during the procedure

The correct answer is:  a tourniquet.

The tourniquets are tight straps around an arm or leg and tightened to stop bleeding, used to control arterial and venous blood flow. In the past, tourniquet are used to control bleeding during amputations. Now,  a tourniquet is used in surgeries to block arterial blood flow following and to minimize blood loss.

i dont know it at allnow im just getting points at this pint