Bone Injection Gun (B.I.G.) 18 gauge PediatricBone Injection Gun (B. I. G.) 18G Pediatric Intraosseous Access Device by Safeguard Medical The Safeguard Bone Injection Gun (B. I. G.) 18G Pediatric (model BIG P) is a single use, spring loaded intraosseous (IO) infusion device specifically engineered for children (ages ~012 years). It provides fast, reliable emergency vascular access when traditional IV lines are difficult or impossible to obtain. With a pre set 1. 5 cm insertion depth and color