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Effect of a circulating nurse walking on airflow and bacteria-carrying particles in the operating room: An experimental and numerical study

机译:循环护士在手术室中行走在气流和细菌的粒子上的影响:实验和数值研究

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摘要

Bacteria-carrying particles (BCPs) shed from surgical staff during surgery are one of the main causes of post operative surgical site infections (SSIs), and the dynamic nature of personnel during surgery make indoor airflow and the distribution of BCPs complicated and difficult to characterize. To investigate the effect of a circulating nurse walking on the airflow and BCP concentration, the Realizable k-E turbulence model and Lagrangian particle tracking model were adopted and validated using airflow velocity and normalized particle concentration obtained from data obtained in an operating room environment cabin. A walking circulating nurse was described by the dynamic mesh model. It was found that when the circulating nurse was not walking, the surgical lamps and thermal plume of surgical staff had a considerable influence on the airflow, resulting a high BCP concentration. This situation did not change when the circulating nurse walked. With increased walking speed, the disturbance of the airflow by the circulating nurse increased significantly, and the length of the wake behind the circulating nurse became longer. Although the walking of the circulating nurse made no difference to the airflow above the operating table, the BCP concentration above nearby instrument tables increased as the circulating nurse passed, resulting in an increased risk of SSI.
机译:从手术期间的手术人员脱落的细菌颗粒(BCP)是术后手术部位感染(SSIS)的主要原因之一,并且手术人员的动态性质使室内气流和BCP分布复杂,难以表征。为了研究循环护士在气流和BCP浓度上行走的效果,采用可实现的K-E湍流模型和拉格朗日粒子跟踪模型,并使用从手术室环境机舱中获得的数据获得的标准化颗粒浓度来验证。动态网格模型描述了行走循环护士。有发现,当循环护士不走路时,手术灯和外科手术人员的热羽对气流有相当大的影响,导致高BCP浓度。当循环护士走路时,这种情况不会改变。随着行走速度的增加,循环护士的气流干扰显着增加,循环护士后面的唤醒长度变得更长。虽然循环护士的行走对操作表上方的气流没有差异,但附近的乐器表上方的BCP浓度随着循环护士通过而增加,导致SSI的风险增加。

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