An angiocatheter is a medical device used for vascular access in medical procedures. It is a thin, hollow tube that is inserted into a blood vessel, typically in the arm or leg, to allow for the delivery of fluids, medications, or contrast agents used in diagnostic imaging. It comes in various sizes, ranging from very small gauges used for delicate procedures, to larger ones used in surgeries or emergency situations. They are often used in procedures such as dialysis, chemotherapy, or diagnostic angiography.