Hemodialysis (HD) is one of the forms of renal replacement therapy for patients with acute and chronic renal failure. It drains the blood from the body to the outside of the body through the circulatory line and passes through the dialyzer that can carry out material exchange, in which the metabolic wastes in the blood (which cannot be removed by itself because of renal failure) and the electrolyte solution (dialysate) containing similar concentration of the body are exchanged with the electrolyte solution (dialysate) through diffusion/convection to remove metabolic wastes from the body, to maintain the electrolyte and acid-base balance; and at the same time, to remove the excessive water from the body and return the purified blood back to the patient, which is known as hemodialysis. The entire process of returning purified blood to the body is called hemodialysis.