To understand the therapeutic mechanism of lung-clearing instrument, we must first understand the structure and physiology and pathology of lung. The lung is in the chest cavity, wrapped by negative pressure cavity (chest cavity), and connected with the heart through pulmonary artery and pulmonary vein. It is composed of trachea, bronchus, alveoli and interstitial lung, and it is a special organ with an open mouth and high humidity. Openness and high humidity are the root causes of lung infection: the lung sputum is not easy to cough up and blocked at the last meeting → it is difficult to cough up and blocked, which will make the infection difficult to heal, the pressure in alveoli will continue to increase, and persistent and severe reflex cough will occur → repeated cough will lead to the increase of alveolar volume due to pressure, forming a vicious circle; Secondly, we should understand the principle of negative pressure pulsation of lung cleaner. "Negative pressure" is a state of gas pressure lower than normal pressure: when breathing, negative pressure appears when the lungs are expanding, and a pressure difference is formed inside and outside the lungs, so that air is sucked into the lungs and waste gas is discharged from the body. Poor breathing is mostly due to excessive carbon dioxide retention in the lungs and enlarged alveoli, that is, poor exhalation, so negative pressure should be used; Pulsation is a high-speed intermittent air flow formed by the lung cleaner driving the valve plate of the pump body with 50Hz electromagnetic wave. This air flow vibrates like a pulse, so it is called pulsation. Click here to learn more.