For patients who frequently receive fluids through intravenous infusion in order to reduce the number of punctures and reduce the stinging sensation, indwelling needles are usually chosen. At the same time, patients should also pay attention to keep local cleanliness and dryness during the whole process of using indwelling needles to avoid infection, which can be taken care of from various stages: 1, during the puncture process: patients should actively cooperate with medical personnel, keep their body position still when disinfecting the skin and puncturing, do not move the other arm around, do not tear fixed dressings such as tape and transparent film at will, and try to maintain relative asepsis to avoid unsuccessful puncture In the process of infusion, patients should be careful not to move around significantly, especially on the side of the indwelling needle, so as not to accidentally fold or accidentally pull out the infusion tube and the indwelling needle. It is also impossible to unscrew or pull out the heparin cap at the indwelling needle on your own. When the liquid is to be infused, call the medical staff to pull it out before the infusion is finished, do not solve the problem on your own; 3, in the state of non-infusion: patients pay attention to hand washing and face washing to protect the puncture site, keep the indwelling needle and the nearby skin dry to avoid contamination. Avoid exertion of the limb on the side of the indwelling needle. If the patch is wet or falls off, or if there is rebleeding, it needs to be handled by the medical staff in time. If abnormal conditions such as redness, swelling, heat, or pain occur near the indwelling needle, the needle should be removed by the medical staff in time to prevent phlebitis. In addition, if the indwelling needle has been stored for 3 days, timely feedback should be given to the medical staff to determine whether it needs to be replaced according to the specific situation.