What is a negative pressure ambulance? Why is this vehicle used to haul away all the people diagnosed with New Crown Pneumonia?

Back in 2003, during the SARS outbreak, ambulances with this negative pressure technology were researched and manufactured.

What are the features of a negative-pressure ambulance

Negative pressure in an ambulance can be understood this wayThe air pressure inside the vehicle is lower than that outside the vehicle, somewhat similar to the direction of the wind in a hood, where the air will only flow in one direction.

The air circulation inside an ambulance has this special rule:

Outside air enters the car from the "top of the car" and is finally discharged from the "bottom of the car"; the upper airflow is from the front to the back, and the lower airflow is from the back to the front, resulting in an airflow from the "top of the car" to the "bottom of the car". The upper airflow is from front to back, and the lower airflow is from back to front, forming a directional flow from the "area where the medical staff are" to the "patient area"; this airflow without a loop will be sterilized and discharged to the outside of the vehicle again after going through a cycle. The new crown pneumonia diagnosis personnel are using this car to pull away from the ambulance patients exhaled with germs in the air, will not be spread from the car inside the car to the car outside; the same inside the car, because of the directional flow of air flow, will not be infected with health care workers.

Negative pressure ambulance has another advantage, there is an isolation chamber in the car, the patient into the isolation chamber on the stretcher to start, the negative pressure system will automatically start.

This ambulance and ordinary ambulance what is the difference between

a similar appearance, the internal structure is not the same

Ordinary ambulance only need to be based on the production of the whole car, and then add some modification to meet the needs of the general rescue of critically ill patients; negative pressure ambulance in the ordinary ambulance on the basis of also want to The negative pressure ambulance, based on the ordinary ambulance, has to add a negative pressure equipment and negative pressure isolation warehouse, the same space also needs to be equipped with respirator, cardiac monitor, ultraviolet disinfection lamps, oxygen interface and other full set of rescue equipment, ordinary ambulance function, in the negative pressure ambulance are available.

Two, more powerful than ordinary ambulance

Ordinary ambulance as long as to meet the rescue of general critical patients; negative pressure ambulance not only able to transport the patient, but also need to solve the problem of infection. How to deal with "patients and medical personnel" cross-infection, smart researchers thought of a way, as long as the air flow is not loop, then it can be a perfect solution to this problem, in this theoretical model, the negative pressure device came into being.

Three, the use of pathways and production modes are different

Ordinary ambulance as long as a certain industry standard, regardless of the large hospitals, small hospitals can be used; negative pressure ambulance, because of its use of the specificity and limitations, not suitable for continuous production, there must be an order first! The first order must be placed before the production.