Misuses of medical surgical masks

Medical surgical masks must comply with YY 0469-2004 "Technical Requirements for Medical Surgical Masks". 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.

Ear-hook type can not be used as surgical protective mask during surgery! ! !

Reasons: Surgery takes a long time, and intraoperative staff need to carry out necessary verbal communication. In order to prevent the "sunset phenomenon" (drops caused by intraoperative surgeons talking, coughing, etc.) along the lower edge of the mask, they have fallen in the surgical field , If you use light to project, you can see the scene like sunset). To reduce infections related to the surgical site, the surgical mask must choose a lace-up type and must not be tied at the lower jaw. (If the knot is tied to the lower jaw, it will easily pollute the neckline when wearing surgical gowns and during surgery.) Cross each other, knot the neck and the back of the head, and after wearing the mask, make sure the nose clip is shaped, and the lower part of the mask should closely fit the lower jaw.