Patent ID: 8715216

Claim:
A method for processing a time-dependent measurement signal obtained from a pressure sensor in a fluid containing system associated with a first pulse generator and a second pulse generator, wherein the pressure sensor is arranged in the fluid containing system to detect a first pulse originating from the first pulse generator and a second pulse originating from the second pulse generator, wherein the fluid containing system comprises an extracorporeal blood flow circuit for connection to a blood system in a human body, and wherein the first pulse generator comprises a pumping device in the extracorporeal blood flow circuit, and wherein the second pulse generator comprises a physiological pulse generator in the human body, said method comprising: receiving the time-dependent measurement signal, obtaining a first pulse profile which is a predicted temporal signal profile of the first pulse, and filtering the time-dependent measurement signal in the time-domain to output an error signal in which the first pulse is essentially eliminated while the second pulse is retained, wherein said filtering comprises: supplying the measurement signal and the first pulse profile as input to an adaptive filter structure comprising an adaptive filter; calculating the error signal between the measurement signal and an output signal of the adaptive filter; and providing the error signal as input to the adaptive filter, whereby the adaptive filter is arranged to essentially eliminate the first pulse in the error signal.