Method and device for processing a time-dependent measurement signal
First Claim
1. A device 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, 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 device comprising:
- an input for the time-dependent measurement signal;
a signal processor connected to said input and comprising a processing module configured to obtain a first pulse profile which is a predicted temporal signal profile of the first pulse, and to filter the time-dependent measurement signal in a time-domain to output an error signal in which the first pulse is essentially eliminated while the second pulse is retained; and
an adaptive filter;
wherein the signal processor is further configured to;
supply the first pulse profile as input to the adaptive filter;
calculate the error signal as a difference between the measurement signal and an output signal of the adaptive filter; and
provide 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.
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Accused Products
Abstract
A monitoring device is arranged to receive a time-dependent measurement signal from a pressure sensor in a fluid containing system, which is associated with a first pulse generator and a second pulse generator. 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. The monitoring device is configured to process the measurement signal to remove the first pulse. In this process, the monitoring device receives the measurement signal, obtains a first pulse profile which is a predicted temporal signal profile of the first pulse, and filters the measurement signal in the time-domain, using the first pulse profile, to essentially eliminate the first pulse while retaining the second pulse. The fluid containing system may include an extracorporeal blood flow circuit and a blood circuit of a human patient.
103 Citations
26 Claims
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1. A device 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, 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 device comprising:
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an input for the time-dependent measurement signal; a signal processor connected to said input and comprising a processing module configured to obtain a first pulse profile which is a predicted temporal signal profile of the first pulse, and to filter the time-dependent measurement signal in a time-domain to output an error signal in which the first pulse is essentially eliminated while the second pulse is retained; and an adaptive filter; wherein the signal processor is further configured to;
supply the first pulse profile as input to the adaptive filter;
calculate the error signal as a difference between the measurement signal and an output signal of the adaptive filter; and
provide 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A computer-readable medium comprising instructions for causing a computer to perform a method for processing a time-dependent measurement signal, said method comprising:
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receiving the time-dependent measurement signal 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, 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, obtaining a first pulse profile which is a predicted temporal signal profile of the first pulse, and filtering the time-dependent measurement signal in a 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 first pulse profile as input to an adaptive filter;
calculating the error signal as a difference 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.
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26. A device 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, 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 device comprising:
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means for receiving the time-dependent measurement signal, means for obtaining a first pulse profile which is a predicted temporal signal profile of the first pulse, and means for filtering the time-dependent measurement signal in a time-domain to output an error signal in which the first pulse is essentially eliminated while the second pulse is retained, wherein said means for filtering is further configured to supply the first pulse profile as input to an adaptive filter;
calculate the error signal as a difference between the measurement signal and an output signal of the adaptive filter; and
provide 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.
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Specification