define haemodialysis and explain its process …

The blood of a patient whose kidneys are completely damaged, filtered through a dialysis machine or dialyser. It removes urea and excess of salts from the blood. It is also called artificial kidney or kidney machine. The process of purifying blood by an artificial kidney is called hemodialysis. ??????? ?? ???????????? :- •Blood of the patient is taken out from main artery, cooled to 0°C and mixed with anticoagulant such as heparin. • Blood is pumped into an artificial kidney. Here blood flows through channels or tubes formed of semipermeable membrane of cellophane. •Cellophane tubes are kept in a dialysing fluid which contains sone small solutes and mineral ions. When the blood flows through these cellophane tubes the nitrogenous wastes like urea, uric acid, creatinine, etc., diffuse out in the dialysing fluid. •The blood that comes out of the artificial kidney is pure blood. It is then warmed to body temperature and mixed with antiheparin to restore its normal coagulability and is returned to the vein of the patient. •Haemodialysis prolongs the life of uraemic patients.

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