Braun Introcan Safety® IV Catheter 24G x 3/4" L, Straight Style, Polyurethane Unique catheters have a passive safety device that is automatically activated and cannot be bypassed. Easy to use and feature double flashback technology for successful needle placement every time. Available in polyurethane, for more comfortable, in-dwelling performance, or FEP polymer with firmer construction for arterial access and special procedures. All are DEHP- and latex-free.