The washing conditions for soil on the outer surfaces of an endoscope were investigated with an automatic endoscope washer/disinfector which uses a newly developed peracetic acid preparation as an exclusive disinfectant. Ultrasonic washing was effective in cleaning the outer surfaces. Although some degree of soil remained after 2.5 minutes of ultrasonic washing, soil could hardly be detected after an additional 2.5 minutes of washing was done with an alkaline detergent. This automatic reprocessor makes it possible to perform both ultrasonic washing and washing by directing detergent flow into the endoscope channels. Thus, it is believed that this device can effectively clean both the outer surfaces, by means of ultrasonic and alkaline detergent washing, and the inner surfaces or channels of an endoscope, by consecutively directing alkaline detergent into the channels to wash and processing with peracetic acid to disinfect (details will be elucidated in a separate report).
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