Janus Amphipathic Dressing With Liquid Self‐Pumping and Blood‐Clot Anti‐Adhesion for Satisfactory Hemostasis

Ideal hemostatic materials for the emergency rescue of war and traffic accident sufferers are essential to significantly control hemorrhage, reduce patient discomfort, and improve the survival ratio. However, most hemostats absorb blood quickly in contact with the wound; and then, adhere to blood clots, resulting in breaking scabs and tearing the wound when the materials are removed. Herein, an effective Janus amphipathic hemostatic dressing (Fiber@Gel/Ca²⁺/KL) with a fiber layer (polylactic acid/carboxymethyl chitosan) and a hydrogel layer (polyvinyl alcohol, carboxymethyl chitosan, Ca²⁺, and kaolin) is reported. Such a composite dressing unidirectionally drains the excessive serum from its hydrophobic side (fiber layer) to its hydrophilic side (hydrogel layer), so-called self-pumping, thereby further concentrating coagulated factors (including red blood cells and platelets). Further, Ca²⁺ diffused from the hydrogel layer subsequently activates platelets and coagulation cascade. Besides, the Fiber@Gel/Ca²⁺/KL exhibits specific blood-clot anti-adhesion property on the fiber layer, making the dressing easily and safely peel off from the wound. It is believed that this novel hemostatic dressing with good hemostatic performance, easy clots removal, and excellent biocompatibility is expected to be used as a safe and efficient hemostatic dressing in clinical applications.