The working principle of anesthesia machine
The patient is connected to a closed mask or tracheal tube after anesthesia induction. Inhalation, the anesthetic mixture of gas through the open breathing valve into the patient's body; exhale, expiratory flap open, while breathing valve closed, discharge exhaled gas. When using auxiliary or controlled breathing, a folding bellows is available. Inhalation pressure, breath when pulled up to ensure that patients have enough ventilation. At the same time according to the actual needs, adjust the ether switch to maintain a stable level of anesthesia. The disadvantage of this device is the low concentration of ether, can only be maintained as anesthesia, and the consumption of ether is large, easy to cause environmental pollution.
3, clear the system
Also known as carbon dioxide absorption system, composed of 1-2 CO2 absorption tank (sodium lime tank), the tank is equipped with sodium lime or barium lime, the main role is to remove the patient out of the gas CO2. The anesthesia machine has a set of monitoring-related devices depending on the configuration, such as monitoring airway, physiological aspects, anesthetic gas concentration, and monitoring of the depth of the patient's anesthesia and the degree of muscle relaxation.
Most of the anesthesia machine monitoring system is only equipped with a basic monitoring device as a platform for the system, the monitoring content includes: airway pressure, inhalation tidal volume, minute ventilation, respiratory rate and the relevant alarm system. Other supervisors are available separately and added to the system.
In addition, anesthesia workstations need to be equipped with anesthesia information management system, the system can receive, analyze and store information related to anesthesia clinical and administrative management, automatic collection of monitor information and automatically generate anesthesia record sheet. Keman, Mindray, Yi An, Chang Feng, Chen Wei, Kai Tai and so on
The patient is connected to a closed mask or tracheal tube after anesthesia induction. Inhalation, the anesthetic mixture of gas through the open breathing valve into the patient's body; exhale, expiratory flap open, while the suction valve closed, discharge exhaled gas. When using auxiliary or controlled breathing, a folding bellows is available. Inhalation pressure, breath when pulled up to ensure that patients have enough ventilation. At the same time according to the actual needs, adjust the ether switch to maintain a stable level of anesthesia.
The disadvantage of this device is the low concentration of ether, can only be maintained as anesthesia, and the consumption of ether is large, easy to cause environmental pollution. The device is a low flow of anesthesia mixed gas, by the air valve (door) one-way flow to the patient. The exhaled gas enters the CO2 absorber via the exhalation valve and is reused. Its structure is mainly composed of oxygen and nitrous oxide device, gas flow meter, evaporator, CO2 absorber; one-way valve, breathing tube, Yiqi valve, air bag and other components, as shown in Figure 2-1-3 Show.
The modern anesthesia machine is also equipped with a ventilator airway pressure, expiratory flow, expiratory CO2 concentration, inhalation anesthetic concentration, oxygen concentration monitor, hypoxia alarm and hypoxia - nitrous oxide automatic protection device. Figure 2-1-4 is an actual anesthesia road map. This is a loop closed anesthesia loop. Before anesthesia, first give the patient a certain amount (usually 3 ~ 5min) of pure oxygen, and then anesthesia operation.
