低温等离子体空气消毒机在骨科病室的应用效果

Objective To satisfy the normalized disinfection in the orthopedic ward, an air sterilizer based on low-temperature plasma has been developed to investigate its sterilization results in a dynamic environment of hospitalization where patients, companions and medical workers are involved. Methods This study took an orthopedics ward inthe Secondary Affiliated Hospital of Xi'an Jiaotong University, as the research object, where a home-made low-temperature plasma air sterilizer was utilized. A six-stage viable Andersen cascade impactor was used to sample the natural bacteria in the ward before and after machine operation for three hours. The species and quantity of bacteria in the ward were analyzed. Results The ozone concentration in the indoor dynamic environment decreased to below 5 ppbv. After three-hour disinfection, the elimination rate of natural bacteria reached 92.35%. The final colony forming unit decreased to ～150 CFU/m3; the extinction rates of Staphylococcus hominis, Bacillus cereus, molds, and Micrococcus luteus were 90.48%, 80.90%, 87.50%, and 92.82% respectively. Even all Haemophilus massiliensis disappeared after two-hour treatment. Conclusion Intermittent disinfection of the dynamic environment in the ward using low-temperature plasma synergistic catalyst has enabled the indoor ozone concentration to reach the first-level national standard line, effectively suppressing secondary pollution caused by ozone leakage while efficiently killing suspended microorganisms in the air, which is close to the disinfection level Ⅰ environment specified in Hygienic Standard for Disinfection in Hospitals(GB 15982-2012). The results also show that the plasma catalytic synergistic disinfection and sterilization has the technical advantages of efficient disinfection and human-machine coexistence, which can ensure indoor air quality safety, reduce the workload of nursing staff, and thus is an effective method to assist or even replace the existing physical and chemical means.