Bioadhesive First‐Aid Patch with Rapid Hemostasis and High Toughness Designed for Sutureless Sealing of Acute Bleeding Wounds

Abstract The global military and civilian sectors express widespread concern over the significant hemorrhage associated with various acute wounds. Such bleedings lead to numerous casualties in military confrontations, traffic accidents, and surgical injuries. Consequently, the rapid control of the bleedings, particularly for extensive and pressurized wounds, is crucial in first‐aid situations. In this work, a double‐layered bioadhesive patch that combines a superabsorbent adhesive hydrogel with a highly tough antibacterial polyurethane film, which is called as Bio‐Patch, is proposed. The Bio‐Patch demonstrates superior mechanical strength and forms robust bioadhesion to acute bleeding wounds. Furthermore, the Bio‐Patch enables protecting against external Gram‐negative and Gram‐positive bacteria. Thanks to the double‐layered structures having synergistic functions of stable barrier and robust adhesion, the Bio‐Patch provides optimal wound sealing (burst strength exceeding 310 mmHg) both in vitro and in vivo. It also demonstrates superior hemostatic effects (less than 30 s) in vivo. This offers promising opportunities for rapid control of extensive and pressurized hemorrhage in first‐aid clinical scenarios.