Anesthesia refers to the method of temporarily losing consciousness of the whole or part of the organism for surgical treatment. There are many methods of anesthesia, such as acupuncture anesthesia, injection anesthesia and inhalation anesthesia. The current method of general anesthesia in hospitals is still based on inhalational anesthesia.
The anesthesia machine is structurally composed of the following parts: frame, external circuit, ventilator, monitoring system.
The anesthesia machine consists of four main subsystems in terms of working principle: gas supply and control circuit system, breathing and ventilation circuit system, removal system, and a set of system functions and breathing circuit monitors. Some anesthesia machines also have monitors and alarms to indicate the values and changes of certain physiological variables and parameters related to cardiopulmonary function or gas and anesthetic concentration in the breathing mixture. Usually manufacturers only provide less monitoring and alarm combinations for standard products.

The anesthesia machine has a set of monitoring-related devices according to different configurations, such as monitoring the airway, physiological aspects, anesthetic gas concentration, and monitoring that can indirectly reflect the patient’s anesthesia depth and muscle relaxation.
The monitoring system of most anesthesia machines is only equipped with a basic monitoring device as the system platform. The monitoring content includes: airway pressure, inhaled tidal volume, minute ventilation, respiratory rate and related alarm systems. Additional monitoring required may be purchased separately and added to the system.
In addition, the anesthesia workstation also needs to be equipped with an anesthesia information management system, which can receive, analyze, and store information related to anesthesia clinical and administrative management, automatically collect information from monitors, and automatically generate anesthesia records.

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