Picc is the abbreviation of Peripherally-inserted-central-venous-catheter, which refers to the placement of central venous catheter via peripheral vein. Its indications: 1, those who need long-term intravenous infusion and whose peripheral superficial veins are not easily punctured; 2, those who need long-term input of highly permeable drugs or irritating drugs; 3, those who need rapid infusion or repeated input of blood products; 4, those who need repeated blood collection for many times.