What is the purpose venous access on hemodialysis?

Venous access use: Patients on hemodialysis need access to their vascular system to remove blood and send it to the artificial kidney (af). That can be done with an arteriovenous fistula, a graft or a central venous catheter. The arterial part of the access is the part that takes the blood out of the patients body to the af. The blood is returned to the patient via the venous access.