The role of masks is to absorb and block harmful aerosols (including dust, smoke, mist, bacteria, toxic gases, etc.). ) Through the filter material, to achieve the purpose of blocking harmful substances. Medical masks worn by clinical medical staff are a simple method of spacers, which can effectively prevent pathogenic microorganisms from entering through the respiratory tract and prevent the spread of diseases from patients to medical staff and from medical staff to patients. In recent years, due to the occurrence of infectious diseases, the industry has paid more and more attention to the use and protection of medical masks. The current status of research and application of medical masks is summarized as follows.
Medical mask protection efficiency standard Medical masks are mainly divided into general medical masks, medical surgical masks and medical protective masks according to their protection efficiency and scope of application. However, there is no uniform standard for various masks in the world. Except for the Chinese YY0469-2011 standard, other standards only specify the filtration efficiency of physical particles, but do not specify the filtration efficiency of biological particles. As a special protective mask for medical staff, the main protection object should be microbial aerosol. Therefore, it is recommended that the national standards for medical protective masks add corresponding bioaerosol detection indicators.