Engineering surgical stitches to prevent bacterial infection

Area of Science:

• Biomaterials Science
• Nanotechnology
• Infectious Disease Research

Background:

• Surgical site infections (SSIs) pose significant burdens due to bacterial adhesion on sutures.
• Conventional antibiotic-coated sutures face challenges from increasing antibiotic resistance.

Purpose of the Study:

• To develop and evaluate metallic nanoparticles (MNPs) coated on PDS-II sutures for antibacterial efficacy.
• To assess the cytocompatibility and structural integrity of MNP-coated sutures.

Main Methods:

• A novel dip-coating method was employed to apply various MNPs onto PDS-II sutures.
• In vitro antibacterial properties against *P. aeruginosa* and *S. aureus* were tested.
• Cytotoxicity and suture structural integrity (strength, degradation) were evaluated.

Main Results:

• MNP coatings were homogeneous, preserving suture strength, integrity, and degradability.
• Fe2O3 MNPs achieved ~90% bacterial kill rate against *S. aureus* and *P. aeruginosa* after 7 days.
• All tested MNP sutures exhibited minimal cytotoxicity, with cell viability >70%.

Conclusions:

• MNP-coated PDS-II sutures present a viable alternative to conventional antibiotic coatings.
• This technology effectively combats bacterial infections while maintaining biocompatibility.
• MNPs offer a promising strategy to mitigate SSIs and overcome antibiotic resistance.