ULTRAFILTRATION CONTROL IN DIALYSIS MACHINE

摘要

The machine includes a flow system for drawing fresh dialysis solution from a source through a dialyzer 12. Inlet and outlet valves 22,26 can cut off flow to and from the dialyzer. An ultrafiltration branch 48 is provided between the valves and the dialyzer for drawing liquid from the dialyzer when the valves are closed. This branch includes a single- acting piston pump 52 operated by a stepper motor 54 to draw the liquid in accurately controlled amounts and at accurately controlled rates.