Analysis Of Some Problems In The Clinical Use Of Anesthesia Machine And Its Treatment

- Jun 21, 2018-

1. Why does an anesthesia breathing machine start for a long time after it is turned on?

The anesthesia ventilator usually starts in 3~5 seconds and starts up. After a long time, it usually starts with a 9V power failure alarm battery. The 9V battery is usually replaced once a year. If the capacity is reduced in less than a year, there is a defect in use. Some anaesthetists are accustomed to surgery, anesthesia ventilator is not pulled off the power, this will cause a power failure alarm, battery consumption.

2, anesthesia ventilator insufficient flow alarm, why adjust the flow switch does not work?

This kind of failure occurs more clinically, especially when adults fold balls for pediatric fold balls or pediatric fold balls for adults fold balls, because the fold balls are not installed in place and alarm failures cannot occur. In order to ensure the patient's tidal volume, the anesthetic ventilator is generally set to zero optocoupler, and each optocoupler zero-optocoupler should get a pulse signal, and one can't get a production alarm.

3, oxygen concentration on the anesthesia monitor

The oxygen concentration sensor also has an electrolyte called an oxygen electrode which is generally added once a year. Some users don't use laughing gas, so the oxygen sensor can't be installed, and it will expire in a year. After the oxygen sensor is mounted on the anesthesia machine, 21% calibration is required. The calibration is automatic, but the sensor must be removed from the anesthesia machine during calibration and placed in the air. According to the above requirements, the oxygen concentration will be normal.

4, anesthesia machine leak

Anesthesia machine leaks are a common clinical problem. The leaked anaesthetist mentioned here has two main sensations. One is that the output tidal volume is lower than the undetermined tidal volume, and the patient is atelectasis. Another feeling is that it seems to hear a slight air leak in the machine, and the oxygen is expensive (refers to the use of an oxygen gas cartridge for air supply.) This situation can be checked from two aspects according to the block diagram of Figure 1. Listen to the sound and use a soapy water test to check the internal leakage of the anesthetic machine. If the internal leak does not occur, check for leaks in the circuit. The specific method is to take a simulated lung fistula, inflate it with a quick button to about 2.0 Kpa, and then follow the block diagram to find the reason from five aspects.

5, anesthesia ventilator output tidal volume is too small

In clinical general anesthesia, the anesthesiologist thinks that the tidal volume calculated based on the patient's weight is correct, but the patient's lungs are not displayed correctly, or the patient's lungs are not suffocating and the ventilation is insufficient. In this case, the flow meter must be checked first. This will happen if there is no fresh supplemental gas. Secondly, because the anesthesia machine takes a long time to have water in the anesthesia ventilator and the circuit connecting pipe, the above-mentioned trouble may also occur due to the water resistance. Specifically refer to Figure 2 for inspection.

6, anesthesia machine flowmeter off less than zero

The flow switch of the anesthesia machine is a needle-type valve. Be sure to close it each time you close it. Do not turn it off. If you turn it off too often, it will damage the needle valve for a long time, and it will result in less than zero shutoff. The solution is to open it up and readjust it.

7. The anesthetic machine consumes large amounts of air and feels anesthetic. Surgeon, anaesthetist feels headache

The large gas consumption is related to the large adjustment of the flow switch. Generally, the flow switch is adjusted to be as small as possible to ensure that the flow does not alarm. It may be appropriate to add some suction plates.

Feel leaky anesthetic first check the evaporator. The evaporator can be removed from the seat, check that the two O-rings on the seat are in good condition, and then check the flow switch, generally 1 to 1.2 liters/minute, because the exhaust gas is too large to be discharged. After the above-mentioned work is done, it still feels that leakage of anesthetic can be connected to a long plastic tube from the exhaust pipe behind the ventilator to the outside.