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The difference between negative pressure ambulance and ordinary ambulance

The biggest difference between a negative pressure ambulance and the other two types of ambulances lies in the word "negative pressure". Simply put, let the air pressure in the car be lower than the outside air pressure, and the air will always be lower from a place where the pressure is high Local mobility, so you can ensure that the virus in the car will not pollute the outside world. In fact, the principle of "negative pressure" is very simple, and it is often seen and used in our daily lives. For example, we use a straw to drink water. Inhalation will create a low pressure zone in the straw, and then the outside air pressure will press the water into our mouth. Another example is the formation of a typhoon. The eye is a low pressure area, so the surrounding air moves towards the eye, and the magnitude of the wind depends on the pressure difference.

First of all, what is a "negative pressure ambulance" and what is the difference between it and an ordinary ambulance? There are three types of ambulances A, B and C. Type A is a transfer ambulance with basic first aid and nursing equipment; Type B is an ambulance, which adds a lot of first aid equipment to Type A, such as pressurized infusion equipment and chest cavity. Decompression equipment, ventilators, defibrillators, etc. Negative pressure ambulances are of type C and are mainly used to transport patients with high-risk infectious diseases, especially diseases that can be transmitted through the air. In addition to the new coronavirus, there are influenza and typhoid fever.

Compared with ordinary ambulances, what are the differences between negative pressure ambulances? First of all, the air in the negative pressure ambulance is under negative pressure, that is, the air pressure in the car is lower than the normal atmospheric pressure. In this way, only the air outside the car is allowed to enter the car under the action of atmospheric pressure. The air in the car is discharged after being harmlessly treated, which is more safe.

We only look from the appearance, the negative pressure emergency vehicle is not much different from the ordinary emergency vehicle, mainly in its internal structure, the negative pressure emergency vehicle has an additional negative pressure device. The device is located in the middle of the carriage, and is similar to a smoke extraction duct that can be moved freely in a barbecue restaurant. The biggest difference between it and general emergency vehicles is that it has the function of isolating airborne diseases.

The air pressure inside the car will be lower than the air pressure outside the car, so air can flow from the outside to the inside of the car. The negative pressure device will form a fixed air circulation area, and the air will flow from top to bottom in the car to ensure that the medical staff get fresh air first, and then filter and absorb the air exhaled by the patient. The filter is generally located on the patient's head, which also ensures that the dirty air is recovered in the first time.

In the design of the car, a stricter isolation cabin can be installed on the basis of the stretcher, which is also an independent negative pressure device. The fan of this isolation cabin is powered by lithium batteries and can be used continuously, which adds another protection for medical staff. The air flowing out of the independent isolation bin directly enters the air filtration system for effective harmless treatment to prevent harmful air from flowing out and causing harm to the outside world.

In fact, the biggest feature of negative pressure ambulances is the ability to "negative pressure isolation", while conventional ambulances cannot do this. Implement emergency treatment of new and sudden infectious diseases, including the transfer of patients at risk of infection, which can be effectively isolated, and the harmless treatment of the air in the car, so as to protect the external environment from pollution and prevent the further spread of the epidemic. It is used for the safe isolation and transfer of people with major infectious diseases. Especially for the new coronavirus epidemic, this kind of negative pressure ambulance must be used to effectively isolate the infected person.

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2025-04-29