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;
sort the difference signal in an order based on the values of the difference signal to generate a sorted difference signal;
identify a first midpoint of a first segment of the sorted difference signal;
identify a second midpoint of a second segment of the sorted difference signal;
determine an algorithm setting based on the first midpoint and the second midpoint;
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 pulse rate of the subject.
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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 and sort the difference signal to generate a sorted difference signal. The system may identify a midpoint of a first segment of the difference signal and a midpoint of a second segment of the difference signal. The first segment may correspond to positive values of the difference signal and the second segment may correspond to negative values of the difference signal. The system may determine an algorithm setting based on the first midpoint and the second midpoint. 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; sort the difference signal in an order based on the values of the difference signal to generate a sorted difference signal; identify a first midpoint of a first segment of the sorted difference signal; identify a second midpoint of a second segment of the sorted difference signal; determine an algorithm setting based on the first midpoint and the second midpoint; 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 pulse rate of the subject. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pulse oximetry processing module for determining physiological information of a subject, wherein the pulse oximetry processing module comprises non-transitory computer-readable storage media configured to:
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store a rate algorithm; receive a photoplethysmographic (PPG) signal from a pulse oximetry sensor, wherein the pulse oximetry sensor detects 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; sort the difference signal in an order based on the values of the difference signal to generate a sorted difference signal; identify a first midpoint of a first segment of the sorted difference signal; identify a second midpoint of a second segment of the sorted difference signal; determine an algorithm setting based on the first midpoint and the second midpoint; apply the algorithm setting to the rate algorithm stored by the pulse oximetry processing module; and determine the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises 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, comprising:
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storing, using a pulse oximeter, a rate algorithm; receiving, using the pulse oximeter, a photoplethysmographic (PPG) signal derived from a pulse oximetry sensor output, wherein the pulse oximetry sensor detects light attenuated by the subject and generates the PPG signal based on the detected attenuated light; generating, using the pulse oximeter, a difference signal based on the PPG signal; sorting, using the pulse oximeter, the difference signal in an order based on the values of the difference signal to generate a sorted difference signal; identifying, using the pulse oximeter, a first midpoint of a first segment of the sorted difference signal; identifying, using the pulse oximeter, a second midpoint of a second segment of the sorted difference signal; determining, using the pulse oximeter, an algorithm setting based on the first midpoint and the second midpoint; applying, using the pulse oximeter, the algorithm setting to the stored rate algorithm; and determining, using the pulse oximeter, the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises pulse rate of the subject. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A non-transitory computer-readable storage media for use in determining physiological information of a subject, the non-transitory computer-readable storage media having computer program instructions recorded thereon for:
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storing a rate algorithm; receiving a photoplethysmographic (PPG) signal derived from a pulse oximetry sensor output, wherein the pulse oximetry sensor detects light attenuated by the subject and generates the PPG signal based on the detected attenuated light; generating a difference signal based on the PPG signal; sorting the difference signal in an order based on the values of the difference signal to generate a sorted difference signal; identifying a first midpoint of a first segment of the sorted difference signal; identifying a second midpoint of a second segment of the sorted difference signal; determining an algorithm setting based on the first midpoint and the second midpoint; applying the algorithm setting to the stored rate algorithm; and determining the physiological information of the subject using the rate algorithm and the PPG signal, wherein the physiological information comprises pulse rate of the subject. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification