PICC lines are medical devices inserted into a patient's vein by a registered nurse with specialized training, allowing for long-term intravenous access and administration of medications, fluids, blood products, and nutrition. Peripherally inserted central catheters (PICC) are flexible thin tubes placed in one of the large veins of the arm to provide vascular access for weeks or months, avoiding repeated needle sticks and allowing for home treatment. Nurses who are specially trained perform PICC line insertions, ensuring patients receive long-term intravenous care and treatment in a safe and effective manner.