Circulating Closed Anesthesia Machine
The device supplies the patient with a low flow of anesthesia mixed gas in a one-way flow through the outgassing valve. Exhaled air enters the CO2 absorber through the expiratory valve for reuse. Its structure is mainly composed of oxygen supply and nitrous oxide device, gas flow meter, evaporator, CO2 absorber; one-way valve, breathing pipeline, outgas valve, storage bag, etc. Modern anesthesia machines are also equipped with ventilation. Airway pressure, expiratory flow, end-tidal CO2 concentration, inhalation anesthetic concentration, oxygen concentration monitor, hypoxia alarm and hypoxia-nitrous oxide automatic protection device.

Its structural principle can be divided into: gas supply and delivery system, anesthetic gas vaporizer, breathing circuit, anesthesia ventilator, safety monitoring system and residual gas removal system.