Assembly for the on-line flushing and filling of an extracorporeal blood circulation system of dialysis machines

A dialysis machine assembly having an internal flushing and filling facility for a blood flow circuit of the assembly, said dialysis machine assembly comprising a dialyzer having a membrane, a first inlet and a first outlet in said dialyzer on one side of the membrane, a first blood tube connected to said first inlet and a second blood tube connected to said first outlet, a second inlet and a second outlet in said dialyzer on the other side of the membrane, a dialysis liquid supply means for providing dialdysis liquid under pressure into said second inlet and through said second outlet and forming a dialysis liquid circuit, sterile filter means upstream of said second inlet for assuring a germ-free state of dialysis liquid entering said second inlet, a valve means in said dialysis liquid circuit located downstream of said second outlet, and means for at least partially closing said valve means and forcing dialysis liquid to flow through the membrane to provide a sterile liquid passing out of said first inlet and outlet and through said first and second blood tubes to flush and fill the blood flow circuit prior to performing a dialysis treatment with said dialysis machine.