7 August 2019 Self-sterilizing photoactivated catheters to prevent nosocomial infections
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Proceedings Volume 11070, 17th International Photodynamic Association World Congress; 110708C (2019)
Event: 17th International Photodynamic Association World Congress, 2019, Cambridge, Massachusetts, United States
Bacterial colonization and biofilm formation on catheters are the primary causes of nosocomial infections and entails a limitation for their long-term use, often requiring catheter removal. Ca. 80% of the urinary tract infections contracted by patients in hospitals are catheter-associated, leading to substantial morbidity, mortality and higher costs. The increase of multi-drug resistant bacteria has created an urgent need for new strategies to prevent biofilm formation on catheters and antimicrobial photodynamic inactivation (aPDI) appears to be a promising approach. We have developed (patent pending) self-sterilizing silicone catheters with a covalently attached layer of photosensitizer (PS) that shows strong antibacterial effect in vitro against a panel of bacterial species commonly related to catheter-associated infections such as Pseudomonas aeruginosa and Staphylococcus epidermidis. Illumination with a 532 nm diode laser light of the PSderivatized catheter surfaces induced killing of 99-99.9% of the bacterial biofilm attached to it. The population survival decreased to a negligible level after 60 min of illumination and no significant decrease of the bacterial viability was observed in the absence of either light or PS. Time-resolved luminescence measurements with detection at 1265 nm confirmed generation of singlet molecular oxygen (1O2) only in PS-derivatized catheters upon illumination, paving the way for future applications to reduce the occurrence of catheter-associated urinary tract infections.
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F. Amaro, M. Gómez-Mendoza, A. B. Descalzo, L. Rivas, and G. Orellana "Self-sterilizing photoactivated catheters to prevent nosocomial infections", Proc. SPIE 11070, 17th International Photodynamic Association World Congress, 110708C (7 August 2019); Logo
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