The invention belongs to the technical field of medical dressings for repairing burn
skin wounds, and provides a double-sustained-release
drug-loaded hydrogel dressing with double-layer microspheres entrapped by a semi-interpenetrating network.
Acrylic acid is used as a pH-sensitive
monomer. The pH / temperature dual-sensitive intelligent hydrogel takes
methacrylic acid 2-
ethyl ester and oligomeric (
ethylene glycol) methyl
ether methacrylate as temperature-sensitive monomers, and an anti-inflammatory
drug gentamicin sulfate is entrapped; the preparation method comprises the following steps: preparing a
calcium alginate core sphere entrapped with
bovine serum albumin through a high-
voltage electrostatic instillation method,
coating the surface of the core sphere with a
chitosan shell layer entrapped with an
antibacterial drug azithromycin to form a double-layer
microsphere, and loading the double-layer
microsphere into the hydrogel to obtain the hydrogel dressing capable of precisely and slowly releasing two drugs and one
protein. According to the pH / temperature change of a
wound surface microenvironment, the hydrogel can achieve accurate
controlled release of drugs and improve the
utilization rate of the drugs, and is a novel double-sustained-release
drug-loaded hydrogel dressing with a semi-interpenetrating network combined double-layer
microsphere structure and good comprehensive performance.