Anesthesia Machine Common Faults And Solutions

- Jun 21, 2018-

First, the phenomenon of failure: Patient breathing circuit leakage.

Possible causes: 1. The APL valve is not closed during manual control, 2. The sodium lime tank is not tightly installed, 3. The threaded pipe is damaged or the joint is loose, 4. The valve cover is not tightened, and 5. The manual/automatic switch fails.

Solution: 1. Close the APL valve half-closed, 2. Reinstall the APL valve half-closed, 3. Replace the new tube or reinstall the tubing, 4. Retighten the valve cover.

Second, the phenomenon of failure: the end of the expiratory collapse can not stretch to the top.

Possible causes: 1. The selected respiratory rate is too high when the tidal volume is large, 2. The patient's breathing circuit leaks, 3. The flow control switch is not turned on, 4. The pressure value of the overflow valve is not adjusted correctly.

Solution: 1. Re-set the appropriate respiratory frequency. 2. Check the leak point as described in the previous example. 3. Open the flow control switch.

Third, the phenomenon of failure: when the air bag is not compressed compressed or compressed range is not enough.

Possible causes: 1. The anesthesia machine working mode changeover switch is still in the manual position, 2. ‘Fast-speed oxygen supply switch failure leaks, 3. The bellows cover glass is damaged, 4. The airway is blocked.

Solution: 1. Turn the working mode switch to the machine control position, 2. Change the bellows cover, 3. Eliminate airway obstructions. The

Fourth, the phenomenon of failure: manual breathing when the airway pressure is too large.

Possible causes: 1. The pressure reducer is faulty and the output pressure is normal when the load is no load. When the oxygen is supplied quickly, the pressure is lower than 0.25Mpa. 2. The set value of the air release valve is not adjusted correctly.

Solution: 1. Replace the pressure reducer. 2. Adjust the flow rate to 1L/min and adjust the output of the purge valve to a suitable range. The

V. Symptoms: Airway pressure upper limit alarm.

Probable reasons; 1. The patient's end of the pipeline is not smooth, 2. The patient's airway obstruction, 3. The upper airway pressure is set to a low level, 4. The change of ventilation parameters.

Solution: 1. Check the patient's end tubing and correct patency, 2. Check the patient's respiratory status, 3. Recalibrate the alarm settings, 4. Recalculate and adjust the ventilation parameters. The

Six, failure phenomenon: Airway pressure lower limit alarm.

Possible causes: 1. Patient end gas line leak, 2. Alarm setting value is too high, 3. Patient compliance changes.

Solution: 1. Check the tubing, correct the leak, 2. Reset the alarm value, 3. Check the patient compliance status. The

Seven, failure phenomenon: No indication of airway pressure parameters.

Possible causes: 1. The connection between the suction channel and the pressure sensor is loose or reversed. 2. The air supply is used up.

Solution: 1. Reconnect the connecting pipe between the suction channel and the pressure sensor. 2. Change the air supply.

Eight, fault phenomenon: Negative pressure high alarm.

Fault analysis and maintenance: When the instrument has a high negative pressure alarm, pay special attention to the sound of the negative pressure pump in the instrument, you can hear the negative pressure pump load is very large, and the sound is low. At this time, after opening the lid of the machine, a white air filter was attached to the negative pressure pump, and the filter was darkened to prove that the air filter was clogged. Replace the air filter and troubleshoot.

Nine, failure phenomenon: Large deviation of tidal volume and set value.

Possible causes: 1. The flow sensor is damaged, 2. The flow sensor needs to be calibrated, 3. The exhalation gas pressure sampling tube is blocked.

Solution: 1. Replace the flow sensor, 2. Check and recalibrate the flow sensor, 3. Replace the exhalation gas pressure sampling tube.

X. Symptoms: Positive end-expiratory pressure occurs when PEEP (end of airway constant positive pressure) is not used.

Possible reasons: 1. The skin itself has a large gravity, 2. The gas compensation flow is not set properly, 3. The airway is blocked.

Solution: 1. Reduce the dead weight of the bladder, 2. Use appropriate flow control, 3. Clear the airway components.