Engineered composite dressing with exudate management capabilities for the process of entire wound healing

A timely antibacterial dressing that can adapt to dynamic wound environments poses a significant challenge in burn research and management. Herein, a four-layered composite dressing is reported. At its core, it features a modified micropore arrayed Janus membrane with a super-hydrophobic polyurethane layer on one side and a super-hydrophilic hydrogel on the other. This unique design enables the dressing to maintain stable and durable self-pumping capabilities, effectively transferring wound exudate to the upper foam layer. The self-pumping rate exceeds that of traditional foam dressings, being approximately 1.39 times more efficient in absorbing excess wound exudate. The composite dressing demonstrates an impressive water donation capacity when tested on 45% gelatin-simulated skin, achieving a water donation rate of (59.20 ± 2.66)%. Furthermore, the water vapor permeability of the composite dressing outperforms hydrocolloids by approximately 3.66 times. Additionally, the composite dressing, when loaded with super-hydrophilic nanometer zinc oxide, exhibits a potent antibacterial effect. The dressing's surface reduces cellular, platelet, fibrinogen, and bovine serum albumin adhesion, reducing the risk of tissue adhesion. During a 20-day trial covering deep II-degree burn wounds, the dressing demonstrated excellent biocompatibility. It effectively compresses the inflammatory phase, promotes vascularization, and significantly accelerates the regeneration of skin accessory organs. This innovative dressing exhibits great potential for use throughout the entire wound-healing process in future burn treatments.