The AV Fistula Needles are assembled by a protective cap, needle tube,double-wing plate, lock fitting, tubing, inner conical interface, lock cover. The AV Fistula Needles are intended to be used with blood composition collecting machines (for example centrifugalization style and rotating membrane style etc.) or blood dialysis machine for venous or arterial blood collecting work, then administer blood composition return to the human body. With an AV fistula, blood flows from the artery directly into the vein, increasing the blood pressure and amount of blood flow through the vein.The increased flow and pressure cause the veins to enlarge. The enlarged veins will be capable of delivering the amount of blood flow necessary to provide an adequate hemodialysis treatment.