medical breathing machine common faults and solutions

　　medical breathing machine, as a necessary first aid equipment in hospitals at all levels, has become very popular, especially during SARS, medical breathing machine played a huge role in saving the lives of countless patients. However, how to use correctly and how to quickly judge and eliminate the fault after the failure is the most troublesome problem. According to years of maintenance experience, the following common faults and solutions are listed for everyone to exchange.

　　Fault phenomenon 1 There is no alarm sound when the air oxygen mixer is connected to only one air source.

　　Analysis and maintenance When ensuring that the compressed air is in the normal working range, the causes of the failure and the solutions are as follows:

　　(1) It is due to the blockage of the vent, and the treatment method is to remove the blockage;

　　(2) There is dirt in the filter inlet, the treatment method is to replace the filter;

　　(3) The alarm reed is broken and damaged, and the treatment method is to replace the reed.

　　Fault Symptom 2 There is an alarm sound when the air and oxygen supply are normal.

　　The reason for the failure is the pressure imbalance, you can check the compressed air and oxygen intake filter to see if there is dust, soak the filter with cleaning solution for a day, dry and reinstall. If the fault does not disappear, the air mixer needs to be replaced.

　　Symptom 3 Low voltage alarm.

　　Low pressure alarms are common in respiratory use. When the fault occurs, check whether the air supply pressure is insufficient. If it is insufficient, adjust the air supply pressure to ensure that the supply pressure is normal. If the pressure is normal, check the breathing line, the pressure tube, and the connection with the patient for air leakage and treat it accordingly. If the fault persists after the above inspection, check whether the position of the low pressure alarm indicator is set correctly, and the correct setting should be lower than the peak suction pressure of 2~75px.

　　Symptom 4 The difference between the set value of tidal volume and the indicator table is too large

　　Analysis and maintenance of the main reason for this failure is the failure of the pressure tube and the indicator, first of all, check whether the pressure tube has a crack or a place of leakage, if there is a corresponding treatment, if there is no water column in the pressure tube, there is a clear water column. If the fault does not disappear, it may be that the indicator fails and needs to be identified and replaced by professional maintenance engineers.

　　Fault Symptom 5 The gauge pointer is still positive before the expiratory breath.

　　Analysis and maintenance The fault mainly has the following reasons

　　(1) PEEP/CAPA controller is not turned off, and the fault phenomenon can be eliminated as long as the controller is turned off.

　　(2) The inner diameter of the breathing pipe used by the medical breathing machine is smaller than the commonly used one. The solution is to replace the medical breathing machine pipe with the commonly used one.

　　(3) The internal resistance of the expiratory valve is too high or the internal leakage of the valve fittings, in this case only replace the valve or the fittings causing the leakage.

　　Symptom 6 Mechanical or autonomous ventilation is faulty.

　　Analysis and maintenance of mechanical/autonomous ventilation faults are mainly caused by the following factors:

　　(1) The atrophy of the autonomous respiratory balloon, this phenomenon may be due to the set of autonomous respiratory volume is lower than the patient's need or the leakage of the breathing pipe, at this time, as long as the autonomous respiratory volume is reset, so that it can keep the respiratory bag filled during the breathing switch or repair the leakage of the fault can be eliminated.

　　(2) The required mechanical tidal volume is not provided during the selected suction time. This phenomenon should first consider whether the pressure of the reducing valve is set too low, and whether some gas is discharged to the periphery when the limit is reached. The solution is to reset the pressure limit of the reducing valve so that it is 3~125px higher than the high pressure alarm line; Second, see whether the selected flow is too low, if too low should refer to the manual to select the correct flow parameters.

　　(3) When the PEEP/CAPA controller is on to the maximum, the PEEP/CAPA pressure does not meet the maximum pressure specification, and this failure is caused by the pressure limit of the reducing valve is lower than the CAPA pressure; Expiratory valve failure; PEEP/CAPA control valve leakage, the corresponding measures should be taken to reset the pressure limit of the pressure reducing valve, replace the valve, and repair or replace the control valve leakage.

　　Concluding remarks: If the medical breathing machine is faulty, check the pipe system and the medical breathing machine parameter Settings. If the medical breathing machine parameter Settings are incorrect, the pipes are leaking or blocked. Will cause the machine to not work properly.

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