US 8,264,363 B2 · System and method for detecting occlusion using flow sensor output

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.

Claims11

Dependent claims

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.

4 more elements

Dependencies are inferred from the claim text.

System and method for detecting occlusion using flow sensor output

Life of this patent

System and method for detecting occlusion using flow sensor output

Life of this patent

Abstract

Claims11