Scheme 1

a Schematic illustration of the self-healing Ag(I)-thiol (Au–S) coordinative hydrogel developed by mixing 4-arm-PEG-SH with AgNO3. b In situ encapsulation of drug (DFO) to obtain an injectable, self-healing, antibacterial, and angiogenic multifunctional hydrogel for diabetic skin wound repair. c Foot ulcers of type I diabetes (left) and therapeutic effect after hydrogel treatment (right). d Mechanism of the hydrogel in repairing skin defects through injection