Gerät zum Messen der Ultrafiltration in einer Dialysemaschine und Verfahren zur Kalibrierung des Gerätes

摘要

Method and device for measuring the flow differential between incoming liquid flow to a dialysis machine and outgoing liquid flow from a dialysis machine, as well as a method for calibration of the device. The dialysis machine comprises a heat exchanger (10) for transfer of heat energy from the outgoing (29) to the incoming (8) liquid flow, a connection (23,24) to a dialyser (2) for feeding the dialysis solution through the dialysate side of the dialyser, a device (20, 28) for attaining an ultrafiltration in the dialyser, and a plurality of temperature sensors (30,31;32,33) for detecting the temperature of the dialysis solution. The flow differential is calculated with help of the equation $where\; DELTA\; Q\; =\; the\; flow\; differential,\; Q\; =\; the\; liquid\; flow,\; DELTA\; T1\; =\; temperature\; difference\; across\; one\; side\; of\; the\; heat\; exchanger\; and\; DELTA\; T2=\; temperature\; difference\; across\; the\; other\; side\; of\; the\; heat\; exchanger.\; Calibration\; takes\; place\; with\; built\; in\; concentrate\; pumps\; (6,16,18).\mathop{\mathrm{image}}$