In the battle against the new epidemic, negative pressure ambulances are often seen. Negative pressure ambulances, that is, protective ambulances, the biggest difference between it and ordinary ambulances is the ability to "negative pressure isolation", mainly for the safe isolation and transfer of major infectious patients.
Only from the appearance, negative pressure ambulance and ordinary ambulance is not much different, the difference is mainly in its internal structure. Negative pressure ambulance body is a closed negative pressure cabin, there is a set of negative pressure device, can make the cabin negative pressure value of -10Pa to -120Pa, so that the fresh air can only flow from the outside to the cabin, and the cabin by the patient's contaminated air can not be directly discharged to the outside of the vehicle, and can make the air flow of dead space and vortex minimum.
In the car airflow control, clean air from above into the car, from under the car was discharged, which can try to ensure that the air in the head position of the medical staff is clean and sterile, while the patient lying in the polluted air, need to be filtered and disinfected, and then discharged to the car, effectively prevented the external pollution.
The design of the car, but also in the stretcher based on the addition of more stringent isolation cabin - independent negative pressure equipment, the fan of this isolation cabin using lithium battery power supply, can be used continuously, for the health care workers to add another safeguard. The air flowing out of the independent isolation chamber goes directly to the air filtration system for harmless treatment.
▲ Internal structure of the negative pressure ambulance
In short, the negative pressure ambulance plays a "triple protection" role. The first protection comes from the negative pressure ambulance medical cabin, which itself is a large negative pressure cabin, to ensure a certain amount of fresh air input at the same time, the cabin air filtered and disinfected out of the vehicle, so as to ensure that the outside environment is not contaminated. The second protection is the negative pressure stretcher cabin, the cabin will form a fixed air flow field, air always flow from the clean zone (medical staff zone) to the source of infection zone (patient area), and then after harmless treatment and discharge, to minimize the probability of cross-infection between doctors and patients in the cabin. The third protection is the personal protection equipment for medical personnel, drivers and stretcher bearers. The "triple protection" escort, in the patient, medical staff, drivers and stretcher bearers to do a good job of safety protection, but also to effectively prevent the further spread of the source of disease. Because the negative pressure ambulance can effectively isolate the infected, so that the air inside the negative pressure cabin is always fresh and clean, so that the cunning new coronavirus in the cabin has no hiding place.
