Systems and methods for determining respiration information from a photoplethysmograph
First Claim
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1. A pulse oximetry monitoring system for processing physiological information of a subject, comprising:
- a pulse oximeter comprising;
a pulse oximetry sensor input configured to be coupled to a pulse oximetry sensor, the pulse oximetry sensor configured to detect light attenuated by the subject and generate a photoplethysmograph (PPG) signal, which is received by the pulse oximetry sensor input;
a microprocessor coupled to the pulse oximetry sensor input and configured to;
generate a plurality of morphology signals based on the PPG signal, wherein each of the plurality of morphology signals is indicative of a respective morphology of the PPG signal,generate a first autocorrelation sequence for a first morphology signal of the plurality of morphology signals,generate a second autocorrelation sequence for a second morphology signal of the plurality of morphology signals,combine at least the first autocorrelation sequence and the second autocorrelation sequence into a combined autocorrelation sequence, anddetermine a respiration rate from the combined autocorrelation sequence; and
a display on which the respiration rate is displayed.
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Abstract
A signal representing physiological information may include information related to respiration. A patient monitoring system may generate a plurality of autocorrelation sequences from the signal and combine the autocorrelation sequences to generate a combined autocorrelation sequence. The combined autocorrelation sequence may be analyzed to identify one or more peaks that may correspond to respiration information. Respiration information such as respiration rate may be determined based on the one or more peaks.
181 Citations
20 Claims
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1. A pulse oximetry monitoring system for processing physiological information of a subject, comprising:
a pulse oximeter comprising; a pulse oximetry sensor input configured to be coupled to a pulse oximetry sensor, the pulse oximetry sensor configured to detect light attenuated by the subject and generate a photoplethysmograph (PPG) signal, which is received by the pulse oximetry sensor input; a microprocessor coupled to the pulse oximetry sensor input and configured to; generate a plurality of morphology signals based on the PPG signal, wherein each of the plurality of morphology signals is indicative of a respective morphology of the PPG signal, generate a first autocorrelation sequence for a first morphology signal of the plurality of morphology signals, generate a second autocorrelation sequence for a second morphology signal of the plurality of morphology signals, combine at least the first autocorrelation sequence and the second autocorrelation sequence into a combined autocorrelation sequence, and determine a respiration rate from the combined autocorrelation sequence; and a display on which the respiration rate is displayed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for processing physiological information of a subject by a pulse oximeter, comprising:
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receiving, using a pulse oximeter, a photoplethysmograph (PPG) signal from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject; generating, using the pulse oximeter, a plurality of morphology signals based on the PPG signal, wherein each of the plurality of morphology signals is indicative of a respective morphology of the PPG signal; generating, using the pulse oximeter, a first autocorrelation sequence for a first morphology signal of the plurality of morphology signals; generating, using the pulse oximeter, a second autocorrelation sequence for a second morphology signal of the plurality of morphology signals; combining, using the pulse oximeter, at least the first autocorrelation sequence and the second autocorrelation sequence into a combined autocorrelation sequence; determining, using the pulse oximeter, a respiration rate from the combined autocorrelation sequence; and displaying, using a display, the respiration rate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer-readable medium for use in processing physiological information of a subject, the non-transitory computer-readable medium comprising:
computer program instructions recorded thereon for causing a pulse oximeter to; receive a photoplethysmograph (PPG) signal from a pulse oximetry sensor, wherein the pulse oximetry sensor is configured to detect light attenuated by the subject; generate a plurality of morphology signals based on the PPG signal, wherein each of the plurality of morphology signals is indicative of a respective morphology of the PPG signal; generate a first autocorrelation sequences for a first morphology signal of the plurality of morphology signals; generate a second autocorrelation sequence for a second morphology signal of the plurality of morphology signals; combine at least the first autocorrelation sequence and the second autocorrelation sequence into a combined autocorrelation sequence; determine a respiration rate from the combined autocorrelation sequence; and display the respiration rate on a display. - View Dependent Claims (18, 19, 20)
Specification