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UV-light based decontamination: An effective and fast way for disinfection of endoscopes in Oto-Rhino-Laryngology?
Background Disinfection of endoscopes is becoming increasingly complex, due to the rising demands of hygiene. Established methods are often expensive and/or time-consuming. In literature there are consistent data about the benefits of surface disinfection by UV-light. Thus, in the present study we analyzed the efficiency of the UV-light in the disinfection of standard rigid endoscopes by the D25 UV-light box, produced by the Dutch company UV-Smart.
Material and methods After mechanical pre-cleaning the surface of the endoscopes by a standardized water-based tissue for 20 seconds, the endoscopes are placed and decontaminated for further 25 seconds in the UV-light box, which is about 50cm in diameter, using Impelux™ UV-light technology.
In a first step surface contact samples were taken from 50 endoscopes after clinical use in order to evaluate the bacterial contamination. 50 additional surface contact samples were taken from the used endoscopes after pre-cleaning and disinfection by the D25 UV-device. Another 50 endoscopes were tested on protein residues, again after pre-cleaning and disinfection.
Results Directly after clinical use the 50 endoscopes showed a high bacterial contamination with an average value of 66 908 colony-forming units (CFU). After the disinfection process, only a minimal contamination on 10 % (n = 5) of the endoscopes with 1 CFU in 4 cases and 2 CFU in a single case and a mean value of 0.12 CFU was found. The documented bacteria were attributed to the normal skin flora. Furthermore all of the 50 tested endoscopes were nearly protein-free (< 1 μg).
Conclusion The D25 UV-light system seems to be an effective, easy and fast device for disinfection of rigid ORL-endoscopes and therefore might be suitable for the usage in clinical practice on site.
10 June 2020 (online)
© Georg Thieme Verlag KG
Stuttgart · New York