Extracorporeal blood treatment device with function-monitoring system

Abstract

An extracorporeal blood treatment device with a function-monitoring system, wherein the extracorporeal blood treatment device for connection to the vascular system of a patient has an input branch and an output branch. The extracorporeal blood treatment device is equipped, in a first circuit, with at least one first pump arranged between the input branch and output branch for moving the patient's blood, and, in a second circuit filled with liquid and thermally connected to the first circuit of the extracorporeal blood treatment device via a heat exchanger, it has temperature-influencing means. The function-monitoring system has, in the second circuit, two temperature sensors which are arranged upstream (TS) and downstream (TS), respectively, with respect to the heat exchanger, in addition, temperature sensor TSis arranged in the output branch of the first circuit, downstream from the heat exchanger. The function-monitoring system moreover comprises a computer system which is operatively connected to the aforementioned temperature sensors and the temperature-influencing means and which, after the temperature has been influenced, establishes, from the detected temperature values, corresponding thermodilution curves (TDK, TDK, TDK) and, in order to determine an indicator of the function of the extracorporeal blood treatment device, relates the TDKand the TDKto each other.