Abstract：
The contaminated liquid mixture containing mucosalivary fluid and blood would be aerosolized during medical procedures, resulting in higher-risk exposures. The novelty of this research is integrating laser visualization and numerical characterization to assess the propagation and evaporation of contaminated droplets, and the interactive effects of humidity and temperature on exposure risks will be numerically evaluated in surgery environments. The numerical model evidenced by experiments can predict the mass balance of ejection droplets, the minimum required fallow time (FT) between appointments, and the disinfection region of greatest concern. Around 98.4 % of the ejection droplet mass will be removed after the cessation of ultrasonic scaling, while the initial droplet size smaller than 72.6μm will dehydrate and become airborne. The FT recommendation of 30 min is not over-cautious, and the extended FT (range of 28-37 min) should be instituted for low temperature (20.5 °C) and high humidity levels (60 %RH). The variation of the temperature and humidity in the range for human thermal comfort has little influence on the area of the disinfection region (0.15m2) and the cut-off size (72.6μm) of droplet deposition and suspension. This research can provide scientific evidence for the guidelines of environmental conditions in surgery rooms.
摘要：
在医疗过程中，含有粘液唾液液和血液的污染液体混合物会被雾化，导致高风险敞口。这项研究的新颖之处在于集成了激光可视化和数值表征，以评估受污染液滴的传播和蒸发，湿度和温度对暴露风险的交互影响将在手术环境中进行数值评估。实验证明的数值模型可以预测喷射液滴的质量平衡，约会之间所需的最小休耕时间(FT)，和最令人关注的消毒区域。超声波结垢停止后，大约98.4%的喷射液滴质量将被去除，而初始尺寸小于72.6μm的液滴将脱水并空气传播。《金融时报》30分钟的建议并没有过于谨慎，对于低温（20.5°C）和高湿度（60％RH），应设置延长的FT（范围为28-37分钟）。温度和湿度在人体热舒适范围内的变化对消毒区域的面积（0.15m2）和液滴沉积和悬浮的截止尺寸（72.6μm）影响很小。本研究可为指导手术室环境条件提供科学依据。
