An implantable venous port(PAC) is a fully implanted vascular access system that provides patients with long-term venous access. Intended for repeated intravenous administration, such as chemotherapy, antibiotics and antivirals, parenteral nutrition, blood sampling or transfusion. Change the injury-free needle at the infusion port every 7 days during infusion. In case of tube blockage, dilute urokinase 5000u/ml or 0.5ml can be injected into the PICC luma using negative pressure technology, and after 15 to 20 minutes, the syringe is used to withdraw the blood, indicating that the thrombus is successfully thawed.