IV Indwelling Needle is a medical device used for intravenous infusion, consisting of a needle core, a cannula, a heparin cap and other components. It is mainly suitable for patients who need long-term or multiple intravenous infusions, blood transfusions, or drug administration, such as patients with chronic diseases, post-operative patients, and critically ill patients. During use, after the cannula is inserted into the vein, the needle core is withdrawn, and the cannula remains in the vein, which can be connected to the infusion device multiple times for treatment. This design can avoid vascular damage caused by repeated punctures, reduce the patient's pain, and at the same time facilitate the operation of medical staff, improving infusion efficiency.