Ultrafiltration dialysis function testing - tests pressure in short time intervals during dialysis to check for deviation

摘要

To test for the correct operation of a haemodialysis system, the dialysator (1) is disconnected from the dialysis fluid circuit (II) during dialysis, and for short time intervals, where the dialysis operating pressure is stable in a fault-free condition. The pressure run in the dialysis fluid in the separated dialysator gives a pressure holding test through detection of the signal from the pressure pick-up (22) for deviation from a stable condition. Also claimed is appts. with an electronic circuit for each balance chamber (14) with two entry stages, one for each half chamber section, to take the pressure signal from the pressure pickup (22). Each entry stage gives the pressure run during the working cycle periods and stores them. A following output stage gives the pressure signal for each chamber section during the separate working cycles. The mean values are compared and a signal is generated if the difference exceeds a set threshold value. USE/ADVANTAGE - The test is for the function of a dialysis operation with volumetric ultrafiltration. The operation tests the function of the control system for the ultrafiltration rate, during dialysis, without additional pressure variation.