n.
or hemodialysis
Process of removing blood from a patient with kidney failure , purifying it with a hemodialyzer (artificial kidney), and returning it to the bloodstream.
Many substances (including urea and inorganic salts ) in the blood pass through a porous membrane in the machine into a sterile solution; particles such as blood cells and proteins are too large to pass. This process controls the acid-base balance of the blood and its content of water and dissolved materials.