What is a ventilator？
The ventilator is a device that can replace, control or change a person's normal physiological breathing, increase lung ventilation, improve breathing function, reduce breathing work consumption, and save heart reserve capacity. When infants and young children are complicated by acute respiratory failure, active conservative treatment is ineffective, the breathing is weakened and the sputum is thick and thick, sputum is difficult to discharge, the airway is blocked or atelectasis occurs. Intubation and ventilator should be considered.
The ventilator must have four basic functions, namely, inflating the lungs, inhaling to exhaling, exhaling alveolar air, and exhaling to inspiratory, in turn. Therefore, it must have: can provide the power to transport gas to replace the work of the human respiratory muscles; can produce a certain breathing rhythm, including breathing frequency and breathing ratio, to replace the function of the human central nervous system to control the breathing rhythm; can provide appropriate tidal gas Volume (VT) or minute ventilation (MV) to meet the needs of respiratory metabolism; the supplied gas should preferably be warmed and humidified to replace the human nasal function, and can supply higher than the amount of O2 contained in the atmosphere, to Increase inhaled O2 concentration and improve oxygenation. Power source: Compressed gas can be used as power (pneumatic) or motor as power (electric). Breathing frequency and breath-breathing ratio can also use pneumatic air control, electric electric control, pneumatic electric control and other types. It is often switched to exhalation (constant pressure type) after reaching a predetermined pressure in the breathing circuit during inhalation or to exhalation (constant volume type) after reaching a predetermined volume during inhalation, but modern ventilators have both Various forms.
The therapeutic ventilator is often used in patients with more complicated and heavier conditions, and requires more complete functions. It can perform various breathing modes to meet the needs of changing conditions. The anesthesia ventilator is mainly used for patients during anesthesia surgery. Most of the patients do not have major cardiopulmonary abnormalities. The required ventilator can basically use IPPV as long as the variable ventilation volume, breathing frequency and breathing ratio can perform IPPV.
Working process of ventilator：
The atmosphere enters the safety valve through the filter. The size of the safety valve and the pump variables are controlled by the CPU. The pressure and volume of the ventilation are set by the doctor according to the needs of the SARS patient. The appropriate amount of gas is adjusted to enter the human mask through the check valve. When entering the human body, the positive pressure is sucked; the one-way valve is closed, the suction pressure is reduced, and the positive pressure of the patient's lungs is automatically reduced, that is, exhaled through a mask.
The pressure of the patient gas is injected, the oxygen pressure of the oxygen cylinder and the positive pressure air are generated.
Medical oxygen is mixed with the air passing through the filter into the air storage tank through the pressure reducing valve. The flow regulator is controlled by the CPU. The pressure and volume of the ventilation are set by the doctor according to the needs of the SARS patient. The appropriate amount of gas is adjusted to enter the person through the check valve. The human body mask enters the human body, that is, inhales the positive pressure. When the patient exhales, the one-way valve is closed, the inhalation pressure is reduced, and the positive pressure inhaled by the patient's lungs is automatically replaced, that is, exhaled through the mask.
Ventilator Chip Solutions —— CPAP Application Solutions for Several Major Brands
(A) Maxim Integrated (B) Texas Instruments (C) STMicroelectronics
(D) NXP Semiconductors (E) Renesas Electronics (F) Microchip Technology