Abstract: A dialysis apparatus for regulated blood dialysis includes a dialyser having flow passages for blood and dialysate, respectfully, separated by semipermeable barriers for transferring liquid from the blood to the dialysate, the blood and dialysate being driven through their respective flow passages by individually associated peristaltic pumps mounted on a common shaft and having the same pumping capacity and being respectively disposed on the inlet and outlet sides of the flow passage for dialysate through the dialyser. A tap outlet is provided between the pumps in communication with the passage. The liquid amount tapped off the tap outlet must therefore be equal to the amount of ultrafiltrate extracted from the blood, and thus the latter amount may readily be gauged and supervised.

Abstract: A flow circuit for recirculating dialyzing liquid through a blood dialyzer includes an airtight bag sealed to conduits for liquid flow between the dialyzer and the bag which is enclosed in a closed container. The container is associated with scale means for weighing the liquid content of the bag and thus indicating the amount of ultrafiltrate extracted from the dialyzed blood and received by the dialyzing liquid. Further, the volume of the container outside the bag is connected with a suction pump operatively disposed to provide suitably reduced pressure within the bag and thus the complete recirculation circuit, with the purpose of achieving predetermined regulation of the extracted amount of ultrafiltrate. The bag and the associated flow conduits may be made of inexpensive plastic materials, which may be discarded after single usage. Thus, sterilization will be superfluous and uninhibited bacterial growth in the recirculation system will be avoided.