Method and device for monitoring the supply of substitution fluid during extracorporeal blood treatment

摘要

The invention relates to a method for monitoring the supply of substitution fluid upstream or downstream of a dialyzer (1) or filter arranged in an extracorporeal blood circuit (50A). A first embodiment provides for the detection of pre- or post-dilution to measure the pressure in the bloodstream downstream of the dialyzer or filter, based on a pre- or post-dilution on the basis of the change in pressure after switching off and / or switching on for the delivery of Substitutionsflüssigkeit provided Substituatpumpe (20) is detected. An alternative embodiment provides to detect a pre- or post-dilution based on the comparison of the oscillatory pressure signal due to the substituate pump (20) with a characteristic reference signal. The characteristic reference signal with which the pressure signal of the substituate pump is compared is preferably the oscillating pressure signal of a blood pump (10) arranged in the bloodstream for conveying the blood upstream of the dialyzer or filter. In addition, the invention relates to an extracorporeal blood treatment device with a device for detecting pre- or post-dilution, which operates according to the methods specified above.