The next day infusion of indwelling needle, in general, after sterilization, directly connected to the infusion line can be, if the indwelling needle has a poor infusion, you can first use a small amount of saline to flush the line, and then connected to the infusion line. The indwelling needle is a commonly used clinical medical device, which mainly retains the soft syringe in the vein to facilitate the infusion of fluids at a later stage. It is especially for pediatric patients, elderly groups and groups that need long-term infusion therapy. It can reduce the fear that venous puncture brings to the patient, and also reduce the damage to the vein caused by multiple punctures. During the infusion on the second day, the specific condition of the indwelling needle is checked first, and alcohol is usually used to sterilize the connection site, and then the infusion line is connected to the end of the indwelling needle. If there is a situation of poor infusion or inability to infuse, you can consider whether there is a blockage of the indwelling needle, you can inject 5 to 10 ml of saline to flush the line, improve the blockage before connecting the infusion line, and finally complete the infusion treatment. After the infusion, a small amount of dilute heparin solution can be injected into the indwelling needle to play an anticoagulant role and reduce the chances of indwelling needle blockage. It is recommended that patients use indwelling needles under professional guidance and supervision.