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Fault analysis and treatment of one-time infusion device.
Aug 10, 2018

Fault analysis and treatment of one-time infusion device

The clinical application of disposable infusion device not only effectively avoids the occurrence of cross infection, but also is convenient and affordable. However, some problems are often encountered in practical use, such as improper handling, which may cause adverse consequences and even endanger life. The following will be introduced.

1. Air enters above the infusion tube

In infusion, if the syringe needle is inserted into the infusion bottle and the syringe needle is located close to the ramp, and the position of the infusion needle is slightly lower than that of the syringe needle, the suction generated by the liquid velocity in the infusion tube will suck the bubble generated by the snorkel into the infusion tube. In addition, as the needle inserted into the infusion bottle has a thin surface and weak stability, the needle attached to the infusion bottle will also move in the corresponding direction and position if the infusion tube is affected by external forces such as the body movement of the patient. Subsequently, the infusion tube intake or not is also changed due to whether the infusion tube needle and the ventilation needle are in the intake position after moving. If the two needles are in an intake position, air can enter the infusion tube from the needle of the infusion tube.


(1) prevent air from entering into the upper part of the infusion tube. When inserting the needle into the infusion tube or the replacement liquid into the bottle stopper, avoid the two needle bevel faces to each other and keep a certain distance;

(2) when infusion occurs, if there is air intake above the infusion tube, one of the two needles should be immediately rotated, and the direction of the inclined surface of the needle should be adjusted, so that the inclined surface of the needle is turned back, which can immediately prevent air from entering.

2. Liquid passes through the air pipe

To prevent fluid leakage, it is common practice to remove the vent needle on the bottle stopper of the infusion tube or hold the vent pipe with hand or pliers for a while, and insert the vent needle or open the vent pipe after a certain amount of liquid is injected. This is both time-consuming and wasteful.


(1) in order to prevent the leakage of liquid, when the liquid is added into the infusion bottle, please note that the amount of air drawn is greater than or equal to the amount of liquid added;

(2) in the case of liquid leakage, the needle of the infusion tube can be removed and the bottle can be inverted to allow the air inside the bottle to escape from the needle. After the pressure of the air inside and outside of the bottle becomes balanced, insert the needle of the infusion tube and the leakage will stop.

3. Venous blood reflux

Clinical infusion sometimes replace the undoped liquid, because of the greater negative pressure in the infusion bottle, resulting in more blood reflux, easy to give patients psychological pressure. Treatment: when the liquid is replaced each time, the ventilator needle should be inserted into the bottle stopper. After the negative pressure in the bottle becomes positive pressure, the needle in the infusion tube can be inserted again, so as to avoid the phenomenon of blood flowing back into the infusion tube.

4. Stop of liquid drip and accompanied by blood reflux

Sometimes the infusion stops halfway through, and blood continues to flow back into the scalp needle silicone tube. After using the hand pressure, can squeeze blood into the blood vessels, after letting go, blood continues to flow back. After treatment, another well-connected needle can be inserted into the bottle stopper to restore the normal status of infusion.

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