Abstract: A dialysis machine assembly having an internal flushing and filling facility for a blood flow circuit of the assembly is disclosed. The dialysis machine assembly includes dialyzer having a membrane and an inlet and an outlet for blood side with corresponding blood tubes and an inlet and an outlet for dialysate side with a valve located downstream of the outlet for dialysate side. A dialysis liquid supply is connected to the inlet for the dialysate side and the valve is partially closed to force dialysis liquid to flow through the membrane from the dialysate side to the blood side through the blood tubes to flush and fill a blood flow circuit prior to performing a dialysis treatment with the dialysis machine.

Abstract: In the on-line method of the invention, dialysis liquid which has been produced or prepared by a dialysis machine is taken from the dialyzer at the blood side and pumped, either by means of a blood pump of the machine or by the pump of the dialysis liquid circuit, through the blood tubes, optionally using the filling program specific to the machine. As a result, the extracorporeal blood circulation system need no longer be flushed and filled with a salt solution, which has so far entailed considerable costs.