Anesthesia machine sends anesthetic into the patient's alveoli through mechanical circuit to form anesthetic partial pressure, which will directly inhibit the central nervous system after diffusion to the blood, thus producing the effect of general anesthesia. The anesthesia machine belongs to a semi open anesthesia device. It mainly consists of anesthesia evaporation tank, flow meter, foldable bellows ventilator, respiratory circuit (including suction and exhalation one-way valves and manual airbags), corrugated pipeline and other components.

The working principle is that after the patient completes anesthesia induction, the air anesthesia machine is connected to a closed mask or tracheal tube. When inhaling, the anesthetic mixture enters the patient's body through the opened inspiratory valve; When exhaling, the exhaling valve opens while the inspiratory valve closes, expelling the exhaled gas. When using auxiliary or controlled breathing, foldable bellows can be used. Press down on inhalation and pull up on exhalation to ensure sufficient ventilation for the patient. Adjust the ether switch according to actual needs to maintain a stable anesthesia level.