Views:1 Author:Site Editor Publish Time: 2018-07-19 Origin:Site
A ventilator is a common medical device that can adjust and improve a person's physiological breathing and improve a person's respiratory function. It plays an important role in modern medical care. So today this article will give you a detailed introduction to the principles and types of ventilators.
The aspiration of natural ventilation produces a negative pressure in the chest, and the alveolar and airway negative pressures when the lungs are passively dilated, thereby forming a pressure difference between the airway opening and the alveoli and completing the inhalation. After inhalation, the chest and lungs are elastically recoiled, creating an opposite pressure differential to complete the exhalation.
The ventilator must have four basic functions: to inflate the lungs, to inhale to exhale, to expel the alveoli, and to exhale to inhale.
(1) Provide an appropriate amount of moisture (VT) or minute ventilation (MV) to meet the needs of respiratory metabolism
(2) Provide the power to transport gas, replacing the work of the human respiratory muscle
(3) Supply good enough gas to be heated and humidified to replace the nasal function of the human body, and can supply more O2 than the amount contained in the atmosphere, so as to increase the concentration of O2 inhaled and improve oxygenation.
(4) Produce respiratory frequency and respiratory absorption ratio and replace the function of human respiratory central nerve to control respiratory rhythm
Modern ventilator power supplies are available in both pneumatic and electric versions.
Ventilator for treatment is commonly used in patients with complex and serious diseases. This ventilator is very functional and can perform a variety of breathing modes to meet the needs of different diseases. The ventilator is mainly used for patients undergoing anesthesia and anesthesia. Most patients have no cardiovascular abnormalities. At this time, the function of the ventilator, mainly respiratory rate and respiratory specific absorption, can be done with IPPV.
1. Fixed capacity respirator
The ventilator pumps a fixed volume of gas into the patient's airway and lungs, producing an inhalation and exhalation. The advantage of this kind of ventilator is that it can guarantee a certain amount of moisture within the safe pressure range under the closed airway condition. The disadvantage is that the air leakage can not be compensated, and the air passage pressure is too high, which can also lead to insufficient ventilation.
2. Constant pressure breathing machine
When inhaling, the ventilator pumps some pressure gas into the airway, causing the alveoli to expand and the airway pressure to rise gradually. When reaching the predetermined pressure, the airflow stops and turns into the exhalation phase. The amount of moisture in such ventilators is related to the preset pressure, suction time and flow rate of the ventilators. If the flow rate is low, the breathing time is short, the predetermined pressure is low, the tidal volume is small, and vice versa, the tidal volume increases. If the lung compliance drops or bronchospasm makes the airway resistance increase, the tidal volume can be decreased.
3. Timing ventilator
It is a timed, pressure limiting and constant current ventilator. The ventilator generates airflow, enters the respiratory tract for a predetermined time, and the inhalation stops, generating exhalation. During the exhalation phase, there is still a low pressure airflow through the airway. It can adjust the inhalation time, respiratory rate, inspiration/expiration ratio and inhaled oxygen concentration.
The above classification is based on the transition from the inspiration phase to the expiration phase. There is also a high-frequency ventilator characterized by high respiratory rate, low water vapor volume, and airway operation that is not closed.
The above is a detailed introduction to the ventilator. You can follow our website, we will often post some useful information to help you solve the problem, our ventilator will definitely bring you good results.