Silver Nanoparticle-Functionalized Medical Devices for Primary Prevention of Healthcare-Associated Infections: In...

Area of Science:

• Biotechnology
• Materials Science
• Infectious Disease Research

Background:

• Healthcare-associated infections (HAIs) are a major global health threat, driven by biofilm-forming, multidrug-resistant pathogens on medical devices.
• Existing antibiotic strategies are increasingly failing due to widespread antimicrobial resistance, necessitating novel prevention methods.

Purpose of the Study:

• To investigate a primary-prevention nanotechnology strategy using silver nanoparticles (AgNPs) to functionalize medical device surfaces.
• To assess the broad-spectrum, long-term antimicrobial efficacy of AgNP-functionalized materials against clinically relevant pathogens.

Main Methods:

• Photochemical functionalization of polyurethane venous catheters, cotton gauze, and HEPA filter membranes with immobilized silver nanoparticles.
• Quantification of silver release using ICP-MS.
• Evaluation of antimicrobial activity via agar diffusion assays against 10 multidrug-resistant clinical isolates.
• Biofilm inhibition assessment using Crystal Violet Assay.

Main Results:

• Controlled silver release (≈0.44 ppm·day^-1) within safety limits was confirmed.
• Demonstrated broad-spectrum antimicrobial activity against bacteria and fungi persisting for over 15 days.
• Achieved >97% inhibition of bacterial and >96% inhibition of fungal biofilm formation by day 15 across all tested substrates.

Conclusions:

• Silver-functionalized surfaces offer an effective and sustainable approach to combat HAIs and antimicrobial resistance.
• This nanotechnology shows significant promise for clinical applications, including medical devices, air filtration, and wound care.
• The strategy aligns with Antimicrobial Stewardship and One Health principles for infection prevention.