Due to the special circumstances of this year, the negative pressure ambulance car appeared in people's field of vision, and it also appeared in many news. But most people don't know this kind of car very well, thinking that it is just like the ordinary ambulances that they see everyday, because their appearance is similar. In fact, the negative pressure ambulance is equipped with a negative pressure function on the basis of ordinary ambulances. This negative pressure function can be understood as putting a "mask" on the ordinary ambulance, so that the inside and outside of the car can be completely " isolation". It is mainly used to transport patients with high-risk infectious diseases, especially those that can be transmitted through the air. In addition to this epidemic, there are cases such as influenza and typhoid, which require special ambulance car of this type.

How does the "mask" function of the negative pressure ambulance reflect? First of all, there is a special air recovery port on the stretcher in the car where the patient is. It will take all the air exhaled by the patient and drain it out of the car after filtration and disinfection. In the medical cabin inside the car, the atmospheric pressure is 10-30 Pa lower than the outside air, so the contaminated air in the car will not flow out of the car through other gaps, and it will not pollute the surrounding environment.

In addition to the negative pressure device, the most critical parts of the vehicle are the air conditioning system and the air filtration and disinfection system. According to national standards, there are strict requirements on the sterilization ability of the filter. The vehicle is equipped with disinfection equipment such as ultraviolet disinfection lamps to disinfect the environment inside the vehicle. In addition, the common medical first aid equipment for negative pressure ambulances is also readily available. Negative pressure ambulances can not only isolate patients, but also rescue operations such as debridement and suture and cardiopulmonary resuscitation in conventional ambulances.

Another difference between negative pressure ambulances and ordinary ambulances lies in the process and production cycle. The production cycle of ordinary ambulances is short and the process is simple. It only needs to place medical equipment in the vehicle according to the standard, but negative pressure ambulances cannot. It needs to consider the airtightness and the need to redesign the interior of the vehicle, as well as the installation holes, maintenance holes and wiring reserved for ordinary models. In principle, the production of a negative pressure ambulance requires at least production Time for two ordinary ambulances. However, due to special circumstances at the beginning of this year, many ambulance manufacturers worked overtime and maintained quality and quantity to produce a negative pressure ambulance in the time of producing an ordinary ambulance.