Air bubbles inside the IV tube do not matter in the vast majority of cases and usually have no significant effect on the human body. Because the infusion is the use of the principle of atmospheric pressure, there is a certain pressure in the vein, when the liquid input is completed, will be due to the pressure in the vein to produce the effect of blood return, a short time air is unlikely to enter the infusion tube in large quantities. In addition, the location of the infusion tube connected to the needle, there is a filter, the filter not only can filter the impurities in the liquid, but also can prevent a large amount of air to pass freely. According to the data, for a 50kg person, usually 10ml of air injected into the body will not cause significant clinical symptoms. A small amount of air bubbles in the IV tubing will not affect the human body as air bubbles entering the body with 10ml of air during infusion are almost non-existent. If the patient has air bubbles in the IV tubing, the infusion can be interrupted by closing the infusion regulator. Straighten the IV tube with one hand with the purpose of stopping it from shaking, and with the other hand, flick your finger continuously at the place where there are air bubbles, and when the bubbles disappear completely, you can open the infusion regulator and continue the infusion.