Investigation of Bacterial Contamination of Medical Machines with Water Tubes

在本研究中，我们调查了有水管的医疗机器、自动内窥镜再处理机、水消毒器和牙科单元的细菌污染情况。所有机器均分离出非典型分枝杆菌、甲基杆菌和非发酵革兰氏阴性杆菌。我们还对医院使用的城市水进行了调查，从城市水中分离出非典型分枝杆菌和甲基杆菌。然而，核因子-GNRs不是从城市水中分离出来的。此外，我们调查了其他医院使用的内窥镜消毒器，得到了类似的结果。我们对医院使用的水消毒器进行了细菌学检查。它们被用来提供洗手用的无菌水。有两种类型的水消毒器：紫外线(UV)型和滤光型。UV型机器通过紫外线杀死水中的微生物。滤光式机器可移除麦克风…通过过滤从水中分离出更多的微生物。本院使用的UV型机器均被非典型分枝杆菌、甲基杆菌和核因子-核糖核酸酶污染。没有定期更换过滤器的过滤器类型的机器也被相同的细菌污染。另一方面，定期更换过滤器的过滤器类型的机器没有被细菌污染。我们检查了牙科单元的细菌污染。接受检查的牙科单位均受到上述细菌的污染。机器的污染程度与使用频率呈负相关。对牙科病房水管进行消毒，可有效地防止细菌污染。结果表明，有水管的医疗机器常被细菌污染。本研究分离到的菌种致病性不强。然而，对于受攻击的主机来说，它们是足够危险的。因此，有必要对机器的细菌污染进行预防和控制。较少

In this study, we investigated bacterial contamination of medical machines with water tubes ; automatic endoscope reprocessors, water sterilizers, and dental units.We investigated bacterial contamination of the endoscope reprocessors used in Jichi Medical School Hospital. Atypical mycobacteria, methylobacteria, and non-fermenting Gram-negative rods(NF-GNRs) were isolated all the machines. We also investigated city water used in the hospital, and atypical mycobacteria and methylobacteria were isolated from city water. However, NF-GNRs were not isolated from city water. In addition, we investigated the endoscope reprocessors used in other hospitals and obtained similar results.We examined bacteriologically the water sterilizers used in our hospital. They had been used in order to supply germ-free water for hand washing. There are two types of water sterilizers ; Ultraviolet(UV) type and Filter type. UV type machines kill microorganisms in water by UV rays. Filter type machines remove mic … More roorganisms from water by filtration. The UV-type machines used in our hospital were all contaminated with atypical mycobacteria, methylobacteria, and NF-GNRs. The filter type machines whose filters had not been replaced regularly were also contaminated with the same bacteria. On the other hand, the filter type machines whose filters had been replaced regularly were not contaminated with bacteriaWe examined bacterial contamination of dental units. The dental units examined were all contaminated with the above bacteria. The contamination level of the machines was negatively correlated with their use-frequency. Disinfection of water lines of dental units was effective for the prevention of bacterial contamination.Our results indicate that medical machines with water tubes are commonly contaminated with bacteria. The bacteria species isolated in this study do not have strong pathogenicity. However, they are dangerous enough for compromised hosts. Thus, it is necessary to prevent and control of the bacterial contamination of the machines. Less