“…IO is a method to deliver blood, fluids, and medications directly into the marrow of the bone. 2 At present, the widely used bone marrow cavity injection devices mainly include bone marrow puncture needles and corresponding equipment, and their mechanisms of action are mostly similar. There are 3 representative first-aid tools for bone marrow cavity infusion: First Access for Shock and Trauma (FAST), Bone Injection Gun (BIG), and EZ-IO.…”