Patent ID: 11925479
Assignee: FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 7:
8. An apparatus for determining the body temperature or a temperature correlated therewith of a patient having an extracorporeal blood circuit, wherein the extracorporeal blood circuit has a heat exchanger which is flowed through by blood at one side and by a heat carrier medium at the other side; characterized in that the apparatus has measurement sensors which are arranged to measure the temperature (Tdi) of the heat carrier medium at the inlet side at the inlet of the heat exchanger and to measure the temperature (Tdo) of the heat carrier medium at the outlet side at the outlet of the heat exchanger and to measure the volume flow of the heat carrier medium (Qd); and in that the apparatus has a calculation unit which is configured to determine the temperature (Tbi) of the blood at the inlet side at the inlet of the heat exchanger in accordance with the relationship

Tbi=Tdi+(Qd/D)(Tdo−Tdi)  (1)

where the value D is a value characteristic of the heat transfer by the heat exchanger.