The connector of the indwelling needle needs to be mated with the needle of the infusion set. The use of an indwelling needle during infusion can play a role in protecting blood vessels, avoiding damage to blood vessels caused by frequent punctures, and at the same time reducing the pain caused by frequent punctures. In general, the connector of the indwelling needle is docked with the needle of the infusion set, and then the thin tube part of the infusion tube is fixed, and then the switch of the infusion tube is turned on, and then the infusion can be done normally, and the operation is very simple. If the treatment of the disease requires multiple infusions, it is recommended to choose the retention needle, so that you do not have to be too afraid of the pain that will occur every time you tie the needle for infusion. However, during the retention of the indwelling needle, protective measures should be taken to maintain local cleanliness and hygiene to avoid infection. After removing the indwelling needle, you should use a medical sterilized cotton swab to press the eye of the needle site, usually press for about 3~5 minutes to avoid bleeding from the eye of the needle.