As one of the most commonly applied medical equipment, patient monitors are widely used in various clinical departments. Therefore, the number of faculty is relatively high. Ensuring the normal operation of the monitor can provide comprehensive monitoring for patients and improve the work efficiency of medical staff and provide important and effective information for disease analysis and diagnosis.
The following introduces the methods of fault analysis and troubleshooting related to the commonly used monitoring parameters ECG (electrocardiogram)
1.ECG related faults
The detection of the ECG of the monitor is a process of using the ECG lead wire to detect and receive the potential difference formed on the body surface by the biological current generated by the electrical excitation of the heart. There are two common faults of the monitor:
Fault phenomenon: After the human body is correctly connected to the ECG electrodes, the monitor prompts "no signal reception" or "electrodes falling off".
Troubleshooting: The monitor prompts "no signal reception" or "electrode falling off", which is generally caused by electrode falling off, damage, or failure of the ECG module, which can be detected with the help of an ECG analog signal generator.
Checking steps: Connect the ECG analog signal generator and ECG lead wires correctly, and start the test.
(1)If the waveform and value of the ECG signal are normal, the monitor and the ECG lead wires are normal, and it is necessary to check whether the connection between the electrodes and the human body is normal. If the electrode falls off or the electrode pads are melted after being used for a long time, there will be no ECG waveform display.
(2)If there is no ECG signal waveform and numerical value display, it is necessary to judge whether the ECG lead wire is in good condition. The intact ECG lead wire can be replaced and tested again. If the fault is eliminated, the original ECG lead wire is damaged and needs to be replaced.
(3) If the fault is still not eliminated after replacing the intact ECG lead wire, it should be suspected that the ECG module is faulty, and the machine needs to be disassembled for repair or replacement.
Fault phenomenon: ECG signal scanning baseline can not be displayed stably on the screen, and drift is uncertain; ECG waveform is abnormal or interfered with, and the measured value is inaccurate.
Troubleshooting: ECG baseline drift, abnormal waveform, inaccurate measurement, generally related to external interference or machine settings.
(1)Check whether the part where the electrode pads are attached to the patient is clean and damp, and clean the skin with alcohol if necessary.
(2)Check whether the electrode pads are well connected or need to be replaced due to long-term use; it is generally recommended that the electrode pads be replaced after using for about 3 hours.
(3)The inside of the machine itself is damp, and it needs to be turned on for 24 hours for drying.
(4)Move the machine to a place with less electromagnetic interference, restart the machine to observe, and eliminate the influence of electromagnetic interference of surrounding machines.
(5)Check whether the AC power supply of the machine has a ground wire. If it is not connected, it needs to be reconnected.
(6)Check whether the selected ECG filtering method or power frequency setting is correct, if not, select the appropriate filtering method and power frequency (generally should be set to 50Hz).