System and method for detecting occlusion using flow sensor output
First Claim
1. A method of detecting an occlusion for an infusion therapy comprising:
- obtaining a baseline output from a flowrate sensor;
filtering the baseline output to form a filtered baseline output;
determining an upper threshold value and a lower 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 (i) the lower threshold value to determine if an occlusion is present upstream of the flowrate sensor, and (ii) the upper threshold value to determine if an occlusion is present downstream from the flowrate sensor.
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Accused Products
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
11 Claims
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1. 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 an upper threshold value and a lower 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 (i) the lower threshold value to determine if an occlusion is present upstream of the flowrate sensor, and (ii) the upper threshold value to determine if an occlusion is present downstream from the flowrate sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An infusion system comprising:
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a fluid pathway between a fluid source and a patient; a flowrate sensor disposed along the fluid pathway; and a processing device in communication with the flowrate sensor, the processing device configured to (i) obtain a baseline output from the flowrate sensor;
(ii) filter the baseline output to form a filtered baseline output, (iii) determine an upper threshold value and a lower threshold value from the filtered baseline output, (iv) monitor a therapy output of the flowrate sensor during the infusion therapy, (v) filter the therapy output to produce a filtered therapy output, and (vi) compare the filtered therapy output to (a) the lower threshold value to determine if an occlusion is present upstream of the flowrate sensor, and (b) the upper threshold value to determine if an occlusion is present downstream from the flowrate sensor.
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Specification