Medical surgical mask
Medical surgical masks are suitable for basic protection of medical staff or related personnel, as well as protection to prevent the spread of blood, body fluids and splashes during invasive operations. The protection level is medium and it has certain respiratory protection performance. It is mainly worn in a clean environment with a cleanliness level of 100,000 or less, working in an operating room, nursing patients with immunocompromised function, and performing body cavity puncture operations. Medical surgical masks can block most bacteria and some viruses, prevent medical staff from being infected, and at the same time prevent the direct discharge of microorganisms carried in the breath of medical staff, posing a threat to patients undergoing surgery. Medical surgical masks require a filtration efficiency of more than 95% for bacteria. Disposable medical surgical masks should also be issued to suspicious respiratory patients to prevent the threat of infection to other hospital personnel and reduce the risk of cross-infection, but the effectiveness of preventing infection is not as good as medical protective masks. [4]
It complies with the YY0469-2004 "Technical Requirements for Medical Surgical Masks" standard. Important technical indicators include filtration efficiency, bacterial filtration efficiency and respiratory resistance. The specific indicators are as follows:
1) Filtration efficiency: Under the condition of air flow (30±2) L/min, the filtration efficiency of sodium chloride aerosol with aerodynamic median diameter (0.24±0.06) μm is not less than 30%.
2) Bacterial filtration efficiency: Under the specified conditions, the filtration efficiency of Staphylococcus aureus aerosol with an average particle diameter of (3±0.3) μm is not less than 95%; the bacterial filtration rate should be ≥95%; for non-oily particles The filtration rate should be ≥30%.
3) Respiration resistance: Under the condition of filtration efficiency and flow rate, the inhalation resistance does not exceed 49Pa and the exhalation resistance does not exceed 29.4Pa. When the pressure difference △P between the two sides of the mask for gas exchange is 49Pa/cm, the gas flow rate should be ≥264mm/s.
4) Nose clip and mask strap: The mask should be equipped with a nose clip, which is made of plastic material, and the length of the nose clip should be greater than 8.0cm. The mask straps should be easy to wear and take, and the breaking strength at the connection point between each mask strap and the mask body should be greater than 10N.
5) Synthetic blood penetration: After 2ml of synthetic blood is sprayed on the outside of the mask at a pressure of 16.0kPa (120mmHg), there should be no penetration on the inside of the mask.
6) Flame retardant performance: The mask material should be made of non-flammable materials, and the mask will burn for less than 5 seconds after leaving the flame.
7) Residual amount of ethylene oxide: The residual amount of ethylene oxide on masks sterilized by ethylene oxide should be less than 10μg/g.
8) Skin irritation: The primary irritation index of the mask material should be ≤0.4, and there should be no allergenic reaction.
9) Microbiological indicators: The total number of bacterial colonies is ≤20CFU/g, and coliforms, Pseudomonas aeruginosa, Staphylococcus aureus, Streptococcus hemolyticus and fungi shall not be detected.
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