Patent ID: 6595944
Filing Date: 2003-07-22
Classification: A61M,B01F

Abstract:
A dialysis machine comprising:a dialyzer subdivided by a semipermeable membrane into a chamber for a liquid to be purified and a dialysis fluid chamber; a dialysis fluid inlet line leading to an inlet of the dialysis fluid chamber; a dialysis fluid outlet line leading away from an outlet of the dialysis fluid chamber; a balancing system connected to the dialysis fluid inlet and outlet lines for balancing fresh and spent dialysis fluid; and a proportioning device for supplying fresh dialysis fluid, the proportioning device comprising: a water source; at least one proportioning unit having a first chamber half and second chamber half configured to operate so that liquid is displaced from one chamber half when the other chamber half is filled with liquid; a proportioning unit inlet line leading from the water source, the proportioning unit inlet line connected to an inlet of the first chamber half and an inlet of the second chamber half, and a proportioning unit outlet line connected to an outlet of the first chamber half and an outlet of the second chamber half, so that the chamber halves can be alternately filled and emptied; at least one mixing point provided in at least one of the proportioning unit inlet line and the proportioning unit outlet line; at least one dialysis fluid concentrate source for supplying a fluid concentrate to the at least one mixing point for forming a fresh dialysis fluid; and an equalizing chamber for the fresh dialysis fluid, the equalizing chamber connected to the proportioning unit outlet line, wherein the equalizing chamber provides a variable buffer volume between the proportioning unit and the balancing system such that the flow rate of a dialysis fluid through the dialysis fluid chamber has no effect on the flow rate of the fresh dialysis fluid in the proportioning unit outlet line.