Anesthesia Machine Is A Kind Of More Complicated Medical Device

- Jun 21, 2018-

Anesthesia machine is a kind of more complicated medical device. It will have many problems in clinic. Here are some typical examples, and analyze the reasons for the problems and the methods to solve them.

1. Why do some anesthesia machines start for a long time after they are switched on?

Anesthesia machine under normal circumstances, start 3 to 5 seconds after the start up, the reason for a very long time to start, usually 9V power failure alarm battery capacity is insufficient, 9V power failure alarm battery is generally replaced once a year, If there is a significant decrease in capacity in less than a year, it indicates that the use is defective. After some anesthesiologists are accustomed to surgery, the anesthesia machine is not turned off, and the power supply is directly pulled off. This will cause a power failure alarm and battery consumption.

2. The anesthetic machine lacks an alarm. Why does it still not work after adjusting the flow switch?

This kind of failure occurs more often in clinical practice, and it is particularly prone to happen when an adult folding ball is changed to a pediatric folding ball, or when a folding ball is replaced by an adult folding ball, an alarm cannot be cancelled because the folding ball is not mounted in place. In order to ensure the patient's tidal volume, the anesthesia machine is generally set to zero optocoupler, and each optocoupler zero optocoupler should get a pulse signal, and once it is not available, an alarm will be generated.

3. Why does the oxygen concentration on the anesthesia monitor go?

The oxygen concentration sensor is also commonly referred to as an oxygen electrode, and an electrolyte is generally added once a year. Some users don't need to laugh, so they don't have to install an oxygen concentration sensor, but they will fail in a year. After the oxygen concentration sensor is installed on the anesthesia machine, 21% calibration is performed. The calibration is automatic, but the oxygen concentration 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. Why does anesthesia machine leak?

Anesthesia machine leaks are a common clinical problem. The anaesthetic machine leaked here, the anaesthetist mainly has two feelings, one feeling is that the output tidal volume is lower than the undetermined tidal volume, and the patient is not atelectasis. Another feeling is that it seems to hear a slight air leak in the machine, and the oxygen is expensive, here is the use of oxygen storage tank gas supply. In this case, a simple leak check should be performed. On the one hand, listen to the sound, and use soapy water to test the internal leakage of the anesthesia machine. If the internal leakage does not occur, you can check the circuit leakage. The specific method is to take a simulated lung, inflate with a quick button to about 2.0Kpa, and then follow the loop to do a leak check.

5. How is the output of tidal volume of anesthesia machine too small?

In general anesthesia surgery, the anesthesiologist thinks that the tidal volume calculated based on the patient's weight is correct, but the monitor shows incorrect, or the patient is not suffocating and has insufficient ventilation. In this case, the anesthesia machine must be checked first. The flow meter is not on, and this will happen if no fresh gas is added. Secondly, it may be because the anesthetic machine has been used for a long time. There will be water accumulation in the anesthesia ventilator and in the connecting pipe. The water resistance will also cause the above malfunction.