Analysis of Common Faults of Infusion Pumps

Infusion pump is a kind of medical equipment that can transport liquid. It often uses peristaltic pump or disk pump as the power source and acts on the infusion catheter to control the infusion speed. It controls the fluid flow into the patient's body through the positive pressure generated by the pump, which is commonly used in clinical nursing equipment. Infusion pump in the clinical use of high frequency, time-consuming, inevitable failure, so it is necessary to master the common troubleshooting methods.

1. Fault 1 

1.1 Fault Symptom

The bubble alarm, which is manifested as the infusion pump alarm caused by air in the infusion pipe at the peristaltic pump.

1.2 Fault Analysis

The possible causes of the failure are: ① the infusion tube exhaust is not enough before infusion, and there are bubbles on the tube wall; ② After a bottle of liquid input is completed, the replacement of the liquid is not timely, and the air enters the infusion tube; ③The liquid level of Murphy's tube is too low, and the tiny bubbles generated by the rebound of water droplets when the liquid drops into the peristaltic pump of the infusion tube gather and produce large bubbles; ④ The infusion tube is not the special infusion tube specified by the manufacturer.

1.3 Troubleshooting

First, check whether there is air in the infusion tube before infusion to minimize the generation of bubbles. When bubble alarm occurs when the liquid level in the infusion tube drops to the bubble sensor, first adjust the flow rate regulator on the infusion set to the infusion speed required by the liquid, so as not to cause changes in the patient's condition when the infusion pump door is opened, then open the infusion pump door, pop out the bubble, and then move the infusion tube up or down a little.In order to avoid the infusion tube squeezed by the peristaltic pump before, and to avoid the tiny bubbles in the liquid congregating at the compressed infusion tube and alarming again. When the infusion tube is venting, the medicine liquid should be injected into 1/2 ~ 1/3 of the Murphy tube. Before the infusion tube is placed on the infusion pump, the distance between the Murphy dropper and the infusion pump should be adjusted, and the Murphy tube is 15 ~ 20 cm away from the infusion pump, so as to reduce the small bubbles generated by the rebound liquid surface when the medicine drops enter the peristaltic pump of the infusion tube and gather, resulting in large bubbles causing alarm [4]. After inspection, it was found that the infusion was not used in the special infusion tube specified by the manufacturer, which caused the bubble alarm. After applying a little water or petroleum jelly in the groove of the ultrasonic sensor, the fault was removed. Try to use the manufacturer's special infusion set during the infusion process to reduce the alarm caused by inappropriate infusion set.

2. Fault 2 

2.1 Fault Symptom

The pressure is too large, which is manifested as poor drug infusion and alarm occurs.

2.2 Fault Analysis
The possible causes of the failure are: ① The flow rate regulator of the infusion set is not opened; ② The infusion pipe is broken; ③The drug precipitates and causes blockage of the infusion tube; ④ Leakage of infusion puncture site; ⑤ The continuous working time of the infusion pump is too long, causing the fuselage to heat.

2.3 Troubleshooting
Check in sequence according to fault analysis: ① During infusion, if the operator forgets to open the flow rate regulator, the infusion pump will alarm after working for a few seconds, then turn on the flow rate regulator and press the "Start" button to cancel the alarm and eliminate the fault caused by this reason；② During infusion, the infusion tube is broken and pressurized, resulting in poor liquid flow, causing alarm. Clean the infusion tube smoothly and press the "Start" button again to eliminate the fault caused by this reason；③Considering the long time input of self-made jejunal nutrient solution due to its large particles prone to blockage, it is assumed that the blockage has occurred, and the infusion set is replaced, but the fault is still; ④ In the process of infusion, observe whether the puncture site of the patient is leaking; ⑤ When touching the body of the infusion pump and finding that it is overheating, because some drugs need to be input for 24 hours, the infusion pump has a long continuous working time, which will cause the fuselage to overheat, indicating excessive pressure and alarm. The solution is to wet the infusion tube and peristaltic pump with a small gauze block and cold water, and wipe the infusion tube and peristaltic pump in the infusion pump.If there is no alarm, the failures are removed.

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