利用液滴喷雾模型对呼吸器与医用口罩的性能进行比较测试。
Comparative Performance Testing of Respirator versus Surgical Mask Using a Water Droplet Spray Model.
机构信息
Department for Health Evidence, Research Laboratory Molecular Epidemiology, 6500 HB Radboudumc, Nijmegen, The Netherlands.
Department of Medical Microbiology, Radboudumc, 6500 HB Nijmegen, The Netherlands.
出版信息
Int J Environ Res Public Health. 2021 Feb 8;18(4):1599. doi: 10.3390/ijerph18041599.
BACKGROUND
During the SARS-CoV-2 pandemic, there was shortage of the standard respiratory protective equipment (RPE). The aim of this study was to develop a procedure to test the performance of alternative RPEs used in the care of COVID-19 patients.
METHODS
A laboratory-based test was developed to compare RPEs by total inward leakage (TIL). We used a crossflow nebulizer to produce a jet spray of 1-100 µm water droplets with a fluorescent marker. The RPEs were placed on a dummy head and sprayed at distances of 30 and 60 cm. The outcome was determined as the recovery of the fluorescent marker on a membrane filter placed on the mouth of the dummy head.
RESULTS
At 30 cm, a type IIR surgical mask gave a 17.7% lower TIL compared with an FFP2 respirator. At 60 cm, this difference was similar, with a 21.7% lower TIL for the surgical mask compared to the respirator. When adding a face shield, the TIL at 30 cm was further reduced by 9.5% for the respirator and 16.6% in the case of the surgical mask.
CONCLUSIONS
A safe, fast and very sensitive test method was developed to assess the effectiveness of RPE by comparison under controlled conditions.
背景
在 SARS-CoV-2 大流行期间，标准呼吸防护设备（RPE）短缺。本研究旨在开发一种测试用于 COVID-19 患者护理的替代 RPE 性能的程序。
方法
开发了一种基于实验室的测试，通过总内漏（TIL）比较 RPE。我们使用横流喷雾器产生带有荧光标记的 1-100 µm 水滴射流。将 RPE 放置在模拟人头模型上，并在 30 和 60 cm 的距离处进行喷雾。结果确定为放置在模拟人头模型口部的膜过滤器上回收的荧光标记。
结果
在 30 cm 处，与 FFP2 呼吸器相比，I 型 II 类外科口罩的 TIL 低 17.7%。在 60 cm 处，这种差异相似，外科口罩的 TIL 比呼吸器低 21.7%。当添加面罩时，呼吸器在 30 cm 处的 TIL 进一步降低了 9.5%，而外科口罩的 TIL 降低了 16.6%。
结论
开发了一种安全、快速且非常敏感的测试方法，通过在受控条件下进行比较来评估 RPE 的有效性。
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