Popular science article: Surgical mask is not equivalent to medical mask!
2020-05-06
Speaking of Surgical Mask, I believe many people are not unfamiliar. Surgical operations and dressing operations all need to be worn, but some packages, although written with this name, are not true. Generally speaking, medical surgical masks must meet the YY 0469-2004 "Technical Requirements for Medical Surgical Masks" standard. Important technical indicators include filtration efficiency, bacterial filtration efficiency and respiratory resistance: 1. Filtration efficiency: Under the condition of air flow (30 ± 2) L / min, the filtration efficiency of aerodynamic median diameter (0.24 ± 0.06) μm sodium chloride aerosol is not less than 30%; 2. Bacterial filtration efficiency: Under the specified conditions, the filtration efficiency of the aerosol of Staphylococcus aureus with an average particle diameter of (3 ± 0.3) μm is not less than 95%; 3. Breathing resistance: Under the condition of filtration efficiency flow, the inhalation resistance does not exceed 49Pa, and the exhalation resistance does not exceed 29.4Pa. 
Surgical protective mask is suitable for all invasive operations, such as blood and body fluid splashing. At the same time, qualified surgical protective masks should have a blocking effect on the large amount of aerosols and smoke particles generated by electrical cutting and electrocoagulation during surgery. Note: The earhook type cannot be used as a surgical protective mask during surgery. Due to the long time of surgical operation, the intraoperative staff need to carry out the necessary verbal communication. In order to prevent the "sunset phenomenon" (refers to the intraoperative surgeons talking, coughing, etc. droplets along the lower edge of the mask, have fallen into the operation one after another , If you use light projection, you can see the sunset like a sunset), to reduce infections related to the surgical site, surgical masks must choose a lace-up type, and no knots on the lower jaw (if the knot is tied to the lower jaw, wear surgery When wearing clothes and during surgery, it is easy to contaminate the neckline). The two laces should cross separately and be knotted at the neck and the back of the head. After the mask is worn, make sure that the nose clip is shaped and the lower part of the mask should closely fit the jaw .
