Dialysis can be divided into hemodialysis and peritoneal dialysis, both of which are a treatment to prolong the life of patients with uremia. The one that requires fistulas is hemodialysis, and the reason why fistulas are chosen is that they are equivalent to establishing long-term access to the patient for hemodialysis. The problem is how to get the blood out of the body, because it has to be taken out of the body, and there are options to get the blood out of the body with an internal jugular vein or a femoral vein, but because the catheter is prone to infection, the preferred way to get the blood out of the body is with a fistula. A fistula is a sutured artery and vein that allows arterial blood to enter the vein directly so that the pressure in the vein is increased and the flow of blood for dialysis can be met. If the vein is punctured directly because of the low pressure in the vein, the blood flow out of the vein is slower and may not drive the dialysis pump on top of the hemodialysis machine.