Medical PICC is the abbreviation of central venous catheterization after peripheral venipuncture, which needs to be operated in a sterile environment, determine the position under ultrasound guidance, and locate the end catheter in the large cardiac vein through your venous puncture, generally in the middle and lower third of the superior vena cava. I, the role of medical PICC: 1, protection of blood vessels: can protect the peripheral veins, reduce the pain of patients due to multiple venous puncture, and can reduce the incidence of phlebitis; 2, the use of a long time: PICC tube body for silicone material, soft, flexible and strong fit is not easy to fall off, can be left for several months or even a year. 2.Applicable people: 1.Long-term infusion patients: suitable for medium and long-term intravenous infusion treatment, and peripheral vascular conditions are not good puncture patients; 2.Chemotherapy patients: chemotherapy patients who need to infuse irritating chemotherapy drugs or hyperosmolar drugs; 3.Other people: patients who need parenteral nutrition support and patients who are hospitalized in bed for a long time. The activity of the limb on the side of the tube should be reduced within 24 hours, and the sleeve should not be too tight to avoid bleeding at the puncture site, avoid weight-bearing and hand-shaking movements, and do appropriate soothing exercises to promote blood circulation. Regular flushing and dressing changes are required after medical PICC placement to prevent deep vein thrombosis and catheter infection.