Angle distribution technique for analyzing a physiological sensor signal
First Claim
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1. A method for determining a physiological parameter, comprising:
- using a processor;
receiving a signal from a sensor, wherein the signal comprises at least two components;
determining a plurality of angles formed by a respective plurality of individual points of a Lissajous plot derived from the at least two components and wherein the angles comprise angles formed between a first line passing through an initial point selected from the plurality of individual points of the Lissajous plot and a second line passing through an individual point selected from another of the plurality of individual points of the Lissajous plot and the initial point;
determining a distribution of the angles; and
determining a physiological parameter based at least in part on the distribution of the angles.
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Abstract
The present disclosure relates generally to patient monitoring systems and, more particularly, to signal analysis for patient monitoring systems. In one embodiment, a method of analyzing a detector signal of a physiological patient sensor includes obtaining the detector signal from the physiological patient sensor, and determining a ratio of the signal between two or more channels. A distribution of the angles between the points of the ratio over time may be used to determine a true ratio or a ratio of ratios for use in the determination of a physiological parameter.
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Citations
16 Claims
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1. A method for determining a physiological parameter, comprising:
using a processor; receiving a signal from a sensor, wherein the signal comprises at least two components; determining a plurality of angles formed by a respective plurality of individual points of a Lissajous plot derived from the at least two components and wherein the angles comprise angles formed between a first line passing through an initial point selected from the plurality of individual points of the Lissajous plot and a second line passing through an individual point selected from another of the plurality of individual points of the Lissajous plot and the initial point; determining a distribution of the angles; and determining a physiological parameter based at least in part on the distribution of the angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16)
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11. A patient monitoring system, comprising:
a patient monitor comprising a processor configured to; receive a plethysmographic signal from a sensor; determine a plurality of ratio values related to the signal at a plurality of time points; determine a distribution of gradients between the plurality of ratio values; determine angles between each of the plurality of ratio values based at least in part on a position of the plurality of ratio values relative to one another; determine a distribution of the angles; compare a first mean and/or peak ratio value determined based on the distribution of the angles to a second mean and/or peak ratio value determined based on the distribution of gradients; determine a physiological parameter based at least in part on the distribution of the angles; and determine a confidence of a value of the physiological parameter based on the comparing of the first mean and/or peak value to the second mean and/or peak value. - View Dependent Claims (12, 13, 14, 15)
Specification