How Many Types of Anesthesia Machines are There?

The types of Modern Anesthesia Machine are as follows:

(1) Air anesthesia machine

The air anesthesia machine is a semi-open anesthesia device. It mainly consists of a liquid medicine tank, an ether regulating switch, folding bellows, and a suction and exhalation one-way valve and a bellows. The device is lightly applicable and can directly use air and oxygen as a carrier gas to assist in breathing and control breathing to meet various surgical requirements.

The working principle is that the patient connects the air anesthesia machine to the closed mask or the tracheal tube after completing the anesthesia induction. When inhaling, the anesthetic mixture enters the patient through the open inspiratory flap; when exhaled, the expiratory flap opens, and the inspiratory flap closes, expelling the exhaled gas. Folding bellows can be used when assisting or controlling breathing. Press down during inhalation and pull up when exhaling to ensure adequate ventilation. At the same time, according to actual needs, adjust the ether switch to maintain a stable anesthesia level.

The shortcoming of this device is that the concentration of ether is low, and it can only be used as anesthetic maintenance, and the consumption of ether is large, which is likely to cause environmental pollution.

(2) DC anesthesia machine

The direct current anesthesia machine consists of high-pressure oxygen, pressure reducer, flow meter, and anesthetic liquid evaporator. The device can only provide oxygen and adjust the concentration of anesthetic gas to be inhaled. There must be other devices in series with the output site for anesthesia.

(3) Closed Anesthesia Machine

The device supplies the patient with a low-flow anesthetic mixture and a one-way activity through the outgassing flap (door). The exhaled gas is re-used through the exhalation flap into the CO2 absorber. Its structure is mainly composed of oxygen supply and nitrous oxide device, gas flow meter, evaporator, CO2 absorber; one-way valve, breathing tube, outgassing valve, storage airbag and so on.

Modern anesthesia machines are also equipped with ventilator airway pressure, expiratory flow, end-tidal CO2 concentration, inhalation anesthetic concentration, oxygen concentration monitor, hypoxic alarm and hypoxic-nitrous oxide automatic protection device.