What does pvc intravenous cannulae mean?

It is a medical device.The main purpose of PVC IV tubing is to provide patients with medical treatments that require long-term venous access, infusion, blood transfusion, drug delivery, and chemotherapy.Unlike traditional intravenous fluids, PVC IV tubing can be left in the patient's body for a longer period of time, which reduces the need for frequent insertion of the tubing and also reduces the inconvenience to the patient.