Oxygen Mask Types

Medical masks are mostly made of one or more layers of non-woven fabrics. The main production processes include meltblown, spunbond, hot air or needle punch, etc., which have the equivalent effect of resisting liquids, filtering particles and bacteria. It is a kind of medical protection. textile.

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Description

Technical Parameters

According to performance characteristics and scope of application, medical masks can be divided into: medical protective masks, medical surgical masks, and ordinary medical masks.

1. Medical protective mask

Medical protective masks are suitable for the protection of medical staff and related staff against airborne respiratory infectious diseases. It is a kind of close-fitting self-priming filtering medical protective equipment with a high level of protection, especially suitable for exposure to airborne during diagnosis and treatment activities. Or worn by patients with respiratory infections spread by droplets at close range. It can filter particles in the air and block droplets, blood, body fluids, secretions, etc. It is a disposable product. Medical protective masks can prevent most pathogens such as bacteria and viruses. The WHO recommends that medical staff use protective masks against particulates to prevent virus infection in the hospital air. [2]

Medical protective masks meet the GB19083-2003 "Technical Requirements for Medical Protective Masks" standard, and important technical indicators include non-oily particle filtration efficiency and airflow resistance. The specific indicators are as follows: [3]

1) Filtration efficiency: Under the condition of air flow (85±2) L/min, the filtration efficiency of sodium chloride aerosol with aerodynamic median diameter (0.24±0.06) μm is not less than 95%, which is in line with N95 ( Or FFP2) and above. It can block airborne infectious agents with a diameter of <5μm or close contact with infectious agents transmitted by droplets.

2) Inhalation resistance: Under the above flow conditions, the inhalation resistance does not exceed 343.2Pa (35mmH2O).

3) For samples sprayed on the mask under the pressure of 10.9Kpa (80mmHg), there should be no technical indicators such as penetration on the inside of the mask.

4) The mask must be equipped with a nose clip, which is made of bendable plastic material, and the length is >8.5cm.

5) The synthetic blood is sprayed onto the mask sample at 10.7kPa (80mmHg) pressure, and there should be no penetration inside the mask.

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