Principle of hemodialysis

In hemodialysis, the blood of the patient via a tube system, controlled by the dialysis machine, passed through a filter. In this filter are hair-thin capillaries, which consist of a semipermeable membrane and are surrounded by a dialysis fluid. Toxic substances or blood salts can now pass through this semipermeable membrane, so that in this way a concentration balance between the patient's blood and dialysis fluid for the said substances takes place and the blood is cleaned.

The dialysis machine itself serves to monitor this process of transporting the blood through a system of pumps, and to determine the composition of the dialysis fluid through which the exchange of substances and the reduction of the patient’s blood volume is achieved.