First, the structure of medical masks

Medical masks generally include two parts of the mask surface and the tension band, the tension band is common for the elastic whole, but some masks in order to strengthen and facial adhesion to increase the protective effect of manual rope tie. Face mask generally has inner, middle and outer three layers, the inner layer to prevent allergies usually use ordinary health gauze or non-woven skin materials, the middle layer is the isolation filter layer, generally use ultra-fine polypropylene fiber melt-blown material layer, the outer layer generally uses ultra-thin polypropylene melt-blown material and other special materials antibacterial layer, the main protective barrier effect of the outer layer and the middle layer, generally used for a certain period of time, The middle layer and outer layer will gradually lose the protective effect, and the disposable mask should be replaced in time after wearing for a certain period of time to ensure the protective effect.

Second, the main classification of medical masks

1. Medical protective masks

Medical protective masks are the highest level of protection masks, common medical N95 masks are medical protective masks, which can filter particles with an aerodynamic diameter of 0.075m±0.020m with a filtration efficiency of more than 95%. In general, the correct wear can isolate the vast majority of germs and viruses in the air, and has a good protective effect for doctors and other personnel who have direct contact with patients for a long time.

2. Surgical masks

Medical surgical masks are not as effective as medical protective masks, but they can still block most bacteria and some viruses, and medical surgical masks require that the filtration efficiency of bacteria can reach more than 95% (different from N95 - the filtration efficiency of particles with an aerodynamic diameter of 0.075m±0.020m).

3. Ordinary medical masks

Common medical masks are mainly used to block the spatter exhaled from the mouth and nose, and have a certain protective effect on preventing cross infection in the ordinary environment. It is generally used for one-time health care in general medical Settings. The lowest level of protection in medical masks. However, the daily protection can play a certain protective effect when the personnel are not too dense.

Iii. Precautions for the use of medical masks

1. Wash hands before wearing a mask, and avoid hands and other pollutants coming into contact with the inside side of the mask during the wearing process.

2. Wear the mask should pay attention to the upper and lower, inside and outside, the upper side of the nose clip formed by metal or other materials fixed strips, press and fit the nose to enhance air tightness.

3. The mask should be replaced in time when the following situations occur: respiratory impedance is significantly increased, breathing is not smooth, the mask is damaged or damaged, the mask cannot fully fit the face, the mask is contaminated (such as blood stains, droplets and other foreign objects), and the mask has been used for more than the recommended time.