An Injectable <scp>CMCS</scp> /γ‐ <scp>PGA</scp> / <scp>PRP</scp> Bioadhesive With Antibacterial, Adhesive, and Regenerative Properties for Infected Wound Healing

Infected traumatic wounds remain a formidable clinical challenge because existing bioadhesives provide only tissue adhesion and lack concurrent antimicrobial and regenerative capabilities. Here, we developed an injectable bioadhesive (CγR) that integrates an "antibacterial-adhesive-regenerative" (AAR) triad by precisely tuning the ratio of carboxymethyl chitosan (CMCS), autologous platelet-rich plasma (PRP), and γ-polyglutamic acid (γ-PGA). CγR exhibits > 99.9% bactericidal efficacy against Escherichia coli and Staphylococcus aureus, delivers instantaneous wet-tissue adhesion (> 3 kPa), and sustains a gradient release of PDGF, TGF-β, and VEGF. In a rat model of infected full-thickness wounds, a single application achieved sterile sealing and complete epithelialization within 6 days, increased collagen deposition by 1.5-fold, and markedly drove macrophage polarization toward the prohealing M2 phenotype. By condensing the conventional "suture-antibiotic-dressing" regimen into a one-step procedure, CγR offers a biosafe and readily scalable platform for managing contaminated complex wounds and holds promise for clinical translation.