Methods and systems for determining an algorithm setting based on a difference signal
First Claim
1. A subject monitoring pulse oximetry system for determining physiological information of a subject, comprising:
- a pulse oximetry sensor configured to detect light attenuated by the subject and generate a photoplethysmographic (PPG) signal based on the detected attenuated light; and
a pulse oximeter coupled to the pulse oximetry sensor, wherein the pulse oximeter is configured to;
store a rate algorithm;
generate a difference signal based on the PPG signal;
determine a plurality of positive areas associated with positive regions of the difference signal;
determine a plurality of negative areas associated with negative regions of the difference signal;
determine a plurality of area ratios based on adjacent positive and negative regions of the difference signal;
determine an algorithm setting based on the plurality of area ratios;
apply the algorithm setting to the rate algorithm stored by the pulse oximeter; and
determine the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises a pulse rate of the subject.
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Accused Products
Abstract
A physiological monitoring system may determine physiological information, such as physiological rate information, from a physiological signal. The system may generate a difference signal based on the physiological signal. The system may determine positive areas associated with positive regions of the difference signal and negative areas associated with negative regions of the difference signal. The system may determine area ratios based on adjacent positive and negative regions of the difference signal. The system may determine an algorithm setting based on the area ratios. The algorithm setting may, for example, affect the amount of filtering applied to the physiological signal.
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Citations
24 Claims
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1. A subject monitoring pulse oximetry system for determining physiological information of a subject, comprising:
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a pulse oximetry sensor configured to detect light attenuated by the subject and generate a photoplethysmographic (PPG) signal based on the detected attenuated light; and a pulse oximeter coupled to the pulse oximetry sensor, wherein the pulse oximeter is configured to; store a rate algorithm; generate a difference signal based on the PPG signal; determine a plurality of positive areas associated with positive regions of the difference signal; determine a plurality of negative areas associated with negative regions of the difference signal; determine a plurality of area ratios based on adjacent positive and negative regions of the difference signal; determine an algorithm setting based on the plurality of area ratios; apply the algorithm setting to the rate algorithm stored by the pulse oximeter; and determine the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises a pulse rate of the subject. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A processing module of a pulse oximeter that is configured to store a rate algorithm for determining physiological information of a subject, wherein the processing module comprises non-transitory computer readable media configured to store instructions that instruct the processing module to:
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receive a photoplethysmographic (PPG) signal derived from a detector output of a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject and generate the PPG signal based on the detected attenuated light; generate a difference signal based on the PPG signal; determine a plurality of positive areas associated with positive regions of the difference signal; determine a plurality of negative areas associated with negative regions of the difference signal; determine a plurality of area ratios based on adjacent positive and negative regions of the difference signal; determine an algorithm setting based on the plurality of area ratios; and apply the algorithm setting to the rate algorithm stored by the pulse oximeter, wherein the pulse oximeter is configured to determine the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises a pulse rate of the subject. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for determining physiological information of a subject by a pulse oximeter, comprising:
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storing, using the pulse oximeter, a rate algorithm; receiving, using the pulse oximeter, a photoplethysmographic (PPG) signal derived from a detector output of a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject and generate the PPG signal based on the detected attenuated light, and wherein the pulse oximeter comprises at least one processor and at least on non-transitory memory configured to store instructions that instruct the at least one processor to execute steps of the method; generating, using the pulse oximeter, a difference signal based on the PPG signal; determining, using the pulse oximeter, a plurality of positive areas associated with positive regions of the difference signal; determining, using the pulse oximeter, a plurality of negative areas associated with negative regions of the difference signal; determining, using the pulse oximeter, a plurality of area ratios based on adjacent positive and negative regions of the difference signal; determining, using the pulse oximeter, an algorithm setting based on the plurality of area ratios; applying, using the pulse oximeter, the algorithm setting to the rate algorithm stored by the pulse oximeter; determining, using the pulse oximeter, the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises a pulse rate of the subject. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A non-transitory computer-readable medium for use in determining physiological information of a subject, the non-transitory computer-readable medium comprising:
computer program instructions recorded thereon for causing a pulse oximeter storing a rate algorithm to; receive a photoplethysmographic (PPG) signal derived from a detector output of a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject and generates the PPG signal based on the detected attenuated light; generate a difference signal based on the PPG signal; determine a plurality of positive areas associated with positive regions of the difference signal; determine a plurality of negative areas associated with negative regions of the difference signal; determine a plurality of area ratios based on adjacent positive and negative regions of the difference signal; determine an algorithm setting based on the plurality of area ratios apply the algorithm setting to the rate algorithm stored by the pulse oximeter; and determine the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises a pulse rate of the subject. - View Dependent Claims (20, 21, 22, 23, 24)
Specification