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Self-disinfection test report from Germande (abstract)
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Contamination of the machine
The filter and the chemicals were taken off and the heater disactivated while the machine was run with heavily contaminated water (106/ml pseudomonas aeruginosa), thus making sure that all part of the circuit was heavily contaminated.
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Tests: three different tests were done
to simulate three different
situations |
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Contamination cycle of the machine |
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Test 1: The self disinfection cycle was run 24 hours after the contamination started |
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Results after one self disinfection cycle 0 bacteria/1000 ml.
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 Washer disinfector for flexible endoscope.
External tank with the contaminating solution
(106 bacteria/ml).
Drain.
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Test 2: The self disinfection cycle was done only a week after the contamination , only one standard cycle was done every day |
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Results: the standard cycle limits the bacterial growth inside the WD (WD contamination level after one week < 103 / 100 ml while the number of bacteria in the water used to contaminate the WD was about 1010.
After a week the first self disinfection cycle led to a residual contamination of 102 / 100 ml an extra one to less than 10 / 100 ml and a third one to 0 / 1000 ml.
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Test 3: Simulation of a contamination of WD chamber that stayed for 72 hours before a self disinfection
(simulation of an aborted cycle during the cleaning that stays for a long week end) |
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Results: after running two self disinfection cycle 0 bacteria / 1000 ml The Soluscope user manual recommends to do a self disinfection cycle every evening and after replacing the 0.2 µ water filter.
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