The principles of hemodialysis mainly include diffusion, convection and adsorption. Hemodialysis is the main treatment for acute and chronic renal failure in order to remove metabolic wastes from the body and regulate water, electrolyte and acid-base balance.
1. Diffusion: the solute moves from the side with high concentration to the side with low concentration according to the difference of concentration gradient of solution on both sides of the semi-permeable membrane.
2. Convection: water molecules are small and can freely pass through the semi-permeable membrane, when the water molecules pass through the semi-permeable membrane under the action of hydrostatic pressure and osmotic pressure, i.e. ultrafiltration occurs, and the solute with the water molecules pass through the semi-permeable membrane in order to remove the toxins, i.e. convection.
3. Absorption: selective absorption of certain elements, drugs, poisons, etc. through the role of positive and negative charges.
Patients who need hemodialysis are recommended to go to the nephrology department of regular hospitals, and the doctors will give the suitable treatment plan according to the patient’s condition.