From the point of view of human physiological structure, because the blood circulation of nasal mucosa is very strong, and the passage in nasal cavity is very tortuous, the nasal hair constitutes a filtering "barrier". When the air is inhaled into the nostrils, the airflow forms a vortex in the tortuous channel, which heats up the airflow in the nasal cavity. Some tests have shown that when cold air of minus 7 ℃ is inhaled into the lungs through the nasal cavity, the air flow has been heated to 28.8 ℃, which is very close to the temperature of human body. If you wear a mask for a long time, it will make the nasal mucosa become fragile and lose the original physiological function of the nasal cavity, so you can't wear a mask for a long time. Masks can only be worn in special environments, such as in places with many people and poor ventilation. Of course, it is necessary to wear a mask when walking in the wild to resist the wind, sand and cold, or to move in the environment with air pollution, but the time should not be too long. In addition, during the flu season, masks should also be worn in public places where there may be a large number of pathogens. Wearing masks is only one of the ways to prevent respiratory infectious diseases. It is very important to keep good living habits.

Cleaning and maintenance

The outer layer of the mask often accumulates a lot of dust, bacteria and other dirt in the outside air, while the inner layer blocks the exhaled bacteria and saliva. Therefore, the two sides can not be used alternately. Otherwise, the dirt on the outer layer will be inhaled into the human body when it is directly close to the face, and become the source of infection. When the mask is not worn, it should be folded into a clean envelope, and the side close to the mouth and nose should be folded inward. Do not put it into the pocket or hang it around the neck.

If the mask is humidified by the exhaled heat or saliva, its function of blocking bacteria will be greatly reduced. Therefore, it is recommended to prepare more masks for replacement, which should be replaced once a day. Wash with boiling water for 5 minutes.

Masks should be cleaned and disinfected every day. Both gauze masks and air filter masks can be disinfected by heating. The specific measures are as follows:

1. Cleaning. First, gently rub the gauze mask with warm water and soap. The bowl shaped mask can be gently cleaned with a soft brush dipped in detergent, and then cleaned with water. Please note that do not rub hard, because if the gap between the warp and weft of the gauze is too large, it will lose the function of preventing droplets.

2. Disinfection. Soak the cleaned mask in 2% Peracetic Acid Solution for 30 minutes, boil it in boiling water for 20 minutes or steam it in a steamer for 15 minutes, and then dry it for standby. This method is suitable for gauze masks and bowl masks.

3. Check. Before using again, you should carefully check whether the masks and masks are still in good condition. For gauze masks and masks, you can take light inspection method, that is, take care of them before the lamp to see if there are obvious light spots, and whether the light transmittance of the middle part and the edge part is consistent. If you have any doubt, you should replace them with new ones. In any case, face masks and masks need to be updated after 3 to 7 times of cleaning. Masks with excellent quality can be cleaned 10 times. Pay attention to replace the activated carbon interlayer regularly. If the activated carbon interlayer is not replaceable, it should be replaced after 7 to 14 days. This kind of mask can not be reused after cleaning.

Deal with it properly

Daily use of masks should be properly handled. Masks used by patients or used in the course of care should be placed in lined containers in the patient's room for reprocessing.