Catheter-associated urinary tract infection (CAUTI) represents one of the most common causes of morbidity and mortality. The resistance demonstrated by many microorganisms to conventional antibiotic therapies and the increasing health-care costs have recently encouraged the definition of alternative preventive strategies, which can have a positive effect in the management of infections. Antimicrobial urinary catheters have been developed through the photo-chemical deposition of silver coatings on the external and luminal surfaces. The substrates are exposed to ultraviolet radiation after impregnation into a silver-based solution, thus inducing the in situ synthesis of silver particles. The effect of the surface treatment on the material was investigated through scanning electron microscopy (SEM) and silver ion release measurements. The ability of microorganisms commonly associated with urinary tract infections was investigated in terms of bacterial viability, proliferation and biofilm development, using Escherichia coli, Klebsiella pneumoniae and Proteus mirabilis as target organisms. The silver coatings demonstrated good distribution of silver particles to the substrate, and proved an effective antibacterial capability in simulated biological conditions. The low values of silver ion release demonstrated the optimum adhesion of the coating. The results indicated a good potential of silver-based antimicrobial materials for prevention of catheter-associated urinary tract infection.
Materials science & engineering. C, Materials for biological applications. 2016 Jul 05 [Epub]
Ian Richard Cooper, Mauro Pollini, Federica Paladini
School of Pharmacy & Biomolecular Sciences, University of Brighton, Lewes Road, Brighton BN2 4GJ, UK., Department of Engineering for Innovation, University of Salento, Via Monteroni, 73100 Lecce, Italy; Silvertech Ltd, Via Monteroni, 73100 Lecce, Italy. Electronic address: ., Department of Engineering for Innovation, University of Salento, Via Monteroni, 73100 Lecce, Italy.