SYSTEM AND METHOD FOR DETECTING OCCLUSION USING FLOW SENSOR OUTPUT
First Claim
1. A method of detecting an occlusion for an infusion therapy comprising:
- monitoring an output signal from a flowrate sensor for a pulsatile fluid flow having a frequency range, the pulsatile flow being through a fluid pathway to a patient;
acquiring a data set that includes the output signal as a function of time;
filtering the data set with a noise rejection filter to produce a filtered data set;
performing spectra analysis on the filtered data set to determine a strength of the output signal in a frequency domain;
calculating a signal strength for the frequency range using the strength of the output signal in the frequency domain; and
comparing the signal strength of the range to at least one threshold level to determine if an occlusion is present during the infusion therapy.
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Abstract
A method of detecting an occlusion for an infusion therapy in one embodiment includes: monitoring an output signal from a flowrate sensor for a pulsatile fluid flow having a frequency range, the pulsatile flow being through a fluid pathway to a patient; acquiring a data set that includes the output signal as a function of time; filtering the data set with a noise rejection filter to produce a filtered data set; performing spectra analysis on the filtered data set to determine a strength of the output signal in a frequency domain; calculating a signal strength for the frequency range using the strength of the output signal in the frequency domain; and comparing the signal strength of the range to at least one threshold level to determine if an occlusion is present during the infusion therapy.
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Citations
19 Claims
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1. A method of detecting an occlusion for an infusion therapy comprising:
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monitoring an output signal from a flowrate sensor for a pulsatile fluid flow having a frequency range, the pulsatile flow being through a fluid pathway to a patient; acquiring a data set that includes the output signal as a function of time; filtering the data set with a noise rejection filter to produce a filtered data set; performing spectra analysis on the filtered data set to determine a strength of the output signal in a frequency domain; calculating a signal strength for the frequency range using the strength of the output signal in the frequency domain; and comparing the signal strength of the range to at least one threshold level to determine if an occlusion is present during the infusion therapy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of detecting an occlusion for an infusion therapy comprising:
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obtaining a baseline output from a flowrate sensor; filtering the baseline output to form a filtered baseline output; determining a threshold value from the filtered baseline output; monitoring a therapy output of the flowrate sensor during the infusion therapy; filtering the therapy output to produce a filtered therapy output; and comparing the filtered therapy output to the threshold value and determining the occlusion based on the comparison. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification