In principle, peripheral IV indwelling needles can be used for about 7-10 days, as long as there is no obvious infection or leakage of fluid from the indwelling site. However, in order to reduce the risk of infection of medical origin and to reduce the risk of damage to the vein caused by frequent infusion from the same vein, it is recommended to remove the needle for 3 days and replace it with another vessel and reinsert the needle for infusion. It is also important to note that the peripheral intravenous needle must be sterilized and the sterile dressing must be changed frequently during its placement, and the tube must be sealed with heparin saline after each infusion. The eye area of the needle should not be exposed to water to avoid infection, and the needle should be removed promptly if there is a risk of infection or dislodgement of the needle.