Original title: [Epidemic Prevention and Control] Identification and use of disposable medical masks Mask identification Identification and use of disposable medical masks Medical masks are mainly divided into medical protective masks, surgical mask and disposable medical masks. Medical masks have relevant national standards and specifications, and the specific specifications include non-oily particle filtration efficiency and airflow resistance. Medical protective masks have the highest level of protection. They mainly filter particles in the air, block droplets, blood, body fluids, secretions and other pollutants. The filtering efficiency of non-oily particles can reach more than 95%. They are commonly used protective equipment to deal with airborne diseases. The protection level of surgical mask is the second, which is commonly used in medical outpatient, laboratory, operating room and other environments with the risk of body fluid and blood splashing. The filtering efficiency of medical masks is limited, and most of them are rectangular design, and the tightness with the face is not as tight as that of medical masks. Disposable medical masks generally lack the requirements for the filtration efficiency of particles and bacteria, or the requirements for the filtration efficiency of particles and bacteria are lower than those of surgical mask and medical protective masks, and they are not required to have a barrier effect on blood, nor are they required to be airtight, so they are only used for disposable health care in ordinary environments. Or pathogenicity a barrier or protection from particles other than microorganisms, such as pollen and the like. I. Standards and technical indicators of medical masks (1) Filtration efficiency: under the condition of air flow of (85 ± 2) L/min, the filtration efficiency of the mask for non-oily particles (Grade 1 ≥ 95%, Grade 2 ≥ 99%, Grade 3 ≥ 99.97%). The filtration efficiency of sodium chloride aerosol is not less than 95%,
Medical Full Body Coverall, that is, it meets the N95 (or FFP2) and above levels. (2) Inspiratory resistance: Under the above flow conditions, the inspiratory resistance shall not exceed 343.2 Pa (35mmH2O). 2. Medical surgical mask: in line with the standard of YY0469-2011 Technical Requirements for Medical Surgical Mask, the important technical indicators include filtration efficiency, bacterial filtration efficiency and respiratory resistance: (1) Filtration efficiency: comply with Respiratory Protective Equipment Self-priming Filter Particulate Respirator (GB2626-2006). The filtration efficiency of non-oily particles shall not be less than 30%; the filtration efficiency of sodium chloride aerosol shall not be less than 30%; Expand the full text (2) Bacterial filtration efficiency: under specified conditions, the bacterial filtration efficiency shall not be less than 95%; (3) Respiratory resistance: Under the condition of filtration efficiency flow, the inspiratory resistance does not exceed 49 Pa, and the expiratory resistance does not exceed 29.4 Pa. 3. Disposable medical masks: conform to YY/T0969-2013 Standard for Disposable Medical Masks,
free shipping disposable coverall, with the filtration efficiency for bacteria not less than 95%; the ventilation resistance for gas exchange not more than 49Pa。 Two, the difference between disposable medical masks and surgical mask. Surgical mask and disposable medical masks are similar in appearance and made of non-woven fabrics, which need to be identified and carefully compared. The thickness and quality of the intermediate filter layer of different types of masks are also significantly different. 1. Different standards: The primary difference between disposable medical masks and surgical mask lies in the standards. The surgical mask conforms to YY 0469-2011 Technical Requirements for surgical mask, and the disposable medical masks conform to YY/T 0969-2013 Standards for Disposable Medical Masks. When you buy a mask, you can find the standard information on the outer package. As long as it is YY 0469-2011, it is a medical surgical mask, and YY/T0969-2013 is a disposable medical mask. 2. The manufacturing process is different: the medical surgical mask is divided into three layers, the inner absorbent layer, the middle filter layer and the outer waterproof layer. The inner layer is a skin-friendly moisture absorption layer (generally spun-bonded non-woven fabric, mainly used for moisture absorption), the middle layer is an isolation filter layer (generally melt-blown fabric with electret treatment, mainly used for blocking bacteria, viruses and fine particles), and the outer layer is a spun-bonded water repellent layer (generally spun-bonded non-woven fabric,
3 Ply Disposable Protective Face Mask ,
KN95 Face Mask, used for blocking droplets). The melt-blown fabric with electret treatment in the middle layer is commonly known as the "heart" of the mask. When the droplets containing the virus are close to the melt-blown fabric, the droplets will be blocked, and the virus will be electrostatically adsorbed on the surface of the fiber, unable to pass through, which can play a role in blocking the spread of the virus. 3. Different protective performance: In the standards of surgical mask and disposable medical masks, the bacterial filtration efficiency is required to be more than 95%, that is to say, both masks can definitely block bacteria. However, there is a significant difference that the filtration efficiency of surgical mask to non-oily particles with a diameter of 0.3 μm is more than 30%, and the fluid resistance to splashes (droplets) of blood and body fluids reaches 120 mmHg, but there is no requirement for disposable medical masks. In addition to isolating bacteria, surgical mask can also isolate blood, body fluid splashes and non-oily particles, while the isolation effect of disposable medical masks on blood, body fluid splashes and non-oily particles is unknown. After electret treatment, the melt-blown fabric in the middle layer of the surgical mask plays a role of electrostatic adsorption barrier for viruses.However, the melt-blown fabric in the middle layer of the disposable medical mask has poor quality or no melt-blown layer, and some of them have not been treated by electret treatment, which has poor barrier effect for viruses. And 4, that use occasion are different: the medical surgical mask can be used for high-level protection of medical staff work in a medical outpatient service, a ward and the like. Disposable medical masks can only be used as ordinary level of protection, if it is a disposable medical mask without melt-blown cloth, it basically has no anti-virus effect. According to the recommendations of the Chinese Center for Disease Control and Prevention: medical staff in general outpatient clinics and wards; staff in crowded places , including staff in hospitals, airports, railway stations, subways, ground buses, airplanes, trains, supermarkets, restaurants and other relatively sealed places; engaged in administrative management related to the epidemic situation , police, security, courier and other employees; home-based quarantine and those living with them It is recommended to wear surgical mask. III. Use of medical masks 1. Carefully cover the mouth and nose with a mask and tie it firmly to minimize the gap between the face and the mask; 2. When using, avoid touching the front of the mask. If the mask is removed, wash hands with soapy water or hand sanitizer; 3. When wearing a medical protective mask, put the fingertips of both hands on the metal nose clip, start from the middle position, press the nose clip inward with your fingers, move and press to both sides respectively, and shape the nose clip according to the shape of the bridge of the nose. 4. Before wearing a medical protective mask to enter the working area, the tightness should be checked. The inspection method is to completely cover the protective mask with both hands and exhale quickly. If there is air leakage near the nose clip, the nose clip should be adjusted. If the air leakage is around, it should be adjusted until there is no air leakage. 5. Replace the mask with a new clean and dry mask in time after the mask is damp and contaminated by the patient's blood and body fluid; 6. Do not reuse disposable masks,
KN95 Mask with Fast Shipping, which should be discarded in special containers or medical waste bags after each use; 7. Wash hands immediately after removing the mask. 8. Medical protective mask (N95) should be used within six hours; surgical mask and disposable medical masks should not be used for more than four hours. 。 Source: Municipal Center for Disease Control Editor: Kang Yuwei Editor: Yang Yuping Disclaimer: Except for the special instructions of the original content, the text and pictures of the articles are from the network and the major mainstream media. The copyright belongs to the original author. If you think the content is infringed, please contact us to delete it. Just released! Jiayuguan City Development Public Welfare Post Recruitment Announcement! Fighting against Epidemic Speeds up the Comprehensive Development of Traditional Chinese Medicine in Jiuquan Iron and Steel Hospital Good-looking "return to Sohu to see more Responsible Editor:.
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