What is the Difference Between a Mono-level Ventilator and a Bi-level Ventilator?

Many people don't understand the difference between a single-level ventilator and a bi-level ventilator. It doesn't matter, as long as you read our article carefully, you can ensure that you can understand the difference between the two.

In order to let everyone understand the single-level ventilator and bi-level ventilator thoroughly and in detail, the concepts of constant pressure ventilator and fully automatic breathing ventilator machine will also be introduced, so we will explain it in three parts.

1. What does the single-level and double-level ventilator mean?

Many people do not know the single-level ventilator and the bi-level ventilator because most people have never been in contact with the ventilator. If you have used these two ventilators, you must know the difference between the two ventilators. Let's use examples from life to make a metaphor.

Suppose we compare the ventilator to a hair dryer, because when the ventilator works, it blows air outside. The difference between single-level and bi-level ventilators is the way of blowing.

The blowing pressure of a single-level ventilator is constant. For example, a blower is blowing. If the blower is single-level, the blower will always blow at a fixed pressure. Switching it to a ventilator is that after a single-level ventilator is turned on, whether you inhale or exhale, the ventilator will only blow air into your mask at a constant pressure.

If the pressure of the single-level ventilator is set to 10, then the single-level ventilator will always blow out at 10 pressures after the machine is turned on, because the pressure will not change with the breathing, this type of ventilator is called single-level breathing ventilator machine.

The bi-level ventilator has two pressures when inhaling, one is the inspiratory pressure, and the other is the pressure when we inhale. One is the expiratory pressure, which is the pressure when we exhale. Generally, the inspiratory pressure is higher than the expiratory pressure.

2. The difference between constant pressure and automatic ventilator

We know that single-level ventilators are also divided into constant-pressure models and fully-automatic models, including dual-level ventilators, which are also divided into constant-pressure and fully-automatic models, so what is the difference between the two?

The constant pressure ventilator is well understood, that is, after the pressure is set, it will not be changed. For example, if the pressure of a single-level constant pressure ventilator is set to 10, then the ventilator will always blow out at a pressure of 10. For another example, if the pressure of the bi-level constant pressure ventilator is set to 4-10, then the machine will always inhale 10 and exhale 4 to blow air.

A fully automatic ventilator means that the pressure will automatically change, and the pressure is not static. For example, a single-level fully automatic ventilator sets the minimum pressure of the ventilator to 4 and the maximum pressure to 13, then the ventilator will be based on the actual situation of the user. Automatically increase or decrease pressure, but the range of pressure changes has been between 4-13. A bi-level fully automatic ventilator has two pressures, and these two pressures will automatically change at the same time.

3. The difference between single-level constant pressure and fully automatic ventilator

The pressure of the single-level constant pressure ventilator, you can see that after the pressure is set to 10, the ventilator will blow at a pressure of 10, and it will always blow at this pressure from the beginning to the end, and the pressure is constant. 

Its pressure changes, you can see that the machine pressure is set to 4.0-13 in the upper left corner of the ventilator. This machine is mainly used for snoring and apnea. If apnea and snoring occur, then this machine will automatically increase the pressure and prevent snoring and apnea through pressure. This pressure can be automatically increased or decreased. The breathing ventilator machine is a single-level fully automatic ventilator.

4. The difference between bi-level constant pressure and fully automatic ventilator

Bi-level constant pressure ventilator is suitable for respiratory failure, chronic obstructive pulmonary disease, chronic bronchial disease and other diseases. Constant pressure ventilator generally has ST mode.

Bi-level constant pressure pressure change: set the pressure to 4-10, then the pressure will be 10 when inhaling, and the pressure will drop to 4 when exhaling. Because it is constant pressure, its pressure will work according to the set 4-10, and it will not automatically change the pressure.

The initial pressure is 4-8. At this time, the inhalation is 8 and the exhalation is 4. The current situation is in line with the characteristics of double levels, that is, there are two pressures. When apnea occurs, the ventilator will automatically increase the pressure, and the pressure has been increased to 5.1-9.1. The purpose of the booster is to keep the upper airway open by increasing the pressure, because this machine has two pressures and can automatically change the pressure, so it is called a bi-level fully automatic ventilator.