Medical device with adaptive power consumption
First Claim
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1. A system, comprising:
- a photoplethysmograph (PPG) sensor comprising at least one emitter comprising a first light emitting diode (LED) and a second LED that are configured to emit light into a tissue of a patient when activated and at least one detector configured to detect the light after interaction with the tissue and to generate a PPG signal based on the detected light;
a motion sensor configured to generate a motion signal indicative of motion of the patient; and
a processor configured to;
receive the PPG signal from the PPG sensor and the motion signal from the motion sensor;
process the PPG signal for a respiration rate, an oxygen saturation, and a pulse rate;
analyze the motion signal to detect motion of the patient and to determine a type of motion of the patient;
in response to detecting a first type of motion, calculate the oxygen saturation and the pulse rate based on the PPG signal and suppress processing of the PPG signal for the respiration rate, wherein the light detected by the detector to generate the PPG signal that is used to calculate the oxygen saturation and the pulse rate during detection of the first type of motion comprises light emitted from the first and second LEDs after interaction with the tissue; and
in response to detecting a second type of motion, deactivate the first LED of the at least one emitter of the PPG sensor while the second LED of the at least one emitter remains activated, wherein the light detected by the detector to generate the PPG signal when the first LED is deactivated comprises light emitted from the second LED after interaction with the tissue, and wherein the processor is configured to calculate the respiration rate of the patient based on the PPG signal while the first LED is deactivated and the second LED is activated.
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Abstract
A system may include a photoplethysmograph (PPG) sensor configured to be secured to a patient and to generate a PPG signal for the patient. The system may also include a motion sensor configured to generate a motion signal indicative of motion of the patient. Further, the system may include a controller configured to receive the PPG signal from the PPG sensor and the motion signal from the motion sensor, to analyze the motion signal to detect motion of the patient, and to deactivate the at least one emitter of the PPG sensor based on the analysis of the motion signal when motion of the patient is detected.
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Citations
16 Claims
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1. A system, comprising:
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a photoplethysmograph (PPG) sensor comprising at least one emitter comprising a first light emitting diode (LED) and a second LED that are configured to emit light into a tissue of a patient when activated and at least one detector configured to detect the light after interaction with the tissue and to generate a PPG signal based on the detected light; a motion sensor configured to generate a motion signal indicative of motion of the patient; and a processor configured to; receive the PPG signal from the PPG sensor and the motion signal from the motion sensor; process the PPG signal for a respiration rate, an oxygen saturation, and a pulse rate; analyze the motion signal to detect motion of the patient and to determine a type of motion of the patient; in response to detecting a first type of motion, calculate the oxygen saturation and the pulse rate based on the PPG signal and suppress processing of the PPG signal for the respiration rate, wherein the light detected by the detector to generate the PPG signal that is used to calculate the oxygen saturation and the pulse rate during detection of the first type of motion comprises light emitted from the first and second LEDs after interaction with the tissue; and in response to detecting a second type of motion, deactivate the first LED of the at least one emitter of the PPG sensor while the second LED of the at least one emitter remains activated, wherein the light detected by the detector to generate the PPG signal when the first LED is deactivated comprises light emitted from the second LED after interaction with the tissue, and wherein the processor is configured to calculate the respiration rate of the patient based on the PPG signal while the first LED is deactivated and the second LED is activated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A patient monitor, comprising:
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a memory encoding one or more processor-executable routines; and a processor configured to access and execute the one or more processor-executable routines encoded by the memory, wherein the one or more processor-executable routines, when executed, cause the processor to; receive a photoplethysmograph (PPG) signal from a PPG sensor configured to be secured to a patient, wherein the PPG sensor comprises at least one emitter comprising a first light emitting diode (LED) and a second LED; receive a motion signal indicative of motion of the patient from a motion sensor; detect patient motion in response to a determination that the motion signal exceeds a motion threshold; determine a type of the patient motion based on the motion signal; and deactivate a first light emitting diode (LED) of at least one emitter of the PPG sensor in response to a determination that the type of patient motion comprises tapping on the PPG sensor, a determination that a degree of the patient motion exceeds a motion degree threshold, and a determination that a duration of the patient motion exceeds a motion duration threshold; and calculate respiration rate based on the PPG signal generated while the second LED is activated. - View Dependent Claims (13, 14, 15)
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16. A system, comprising:
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a photoplethysmograph (PPG) sensor comprising at least one emitter comprising a first light emitting diode (LED) and a second LED that are configured to emit light into a tissue of a patient when activated and at least one detector configured to detect the light after interaction with the tissue and to generate a PPG signal based on the detected light; a motion sensor configured to generate a motion signal indicative of motion of the patient; and a processor configured to; receive the PPG signal from the PPG sensor and the motion signal from the motion sensor; process the PPG signal for a respiration rate, an oxygen saturation, and a pulse rate; analyze the motion signal to determine a type of motion of the patient; and in response to a determination that the type of motion is tapping on the PPG sensor, deactivate the first LED of the at least one emitter of the PPG sensor while the second LED of the at least one emitter remains activated, wherein the light detected by the detector to generate the PPG signal when the first LED is deactivated comprises light emitted from the second LED after interaction with the tissue, and wherein the processor is configured to calculate the respiration rate of the patient based on the PPG signal while the first LED is deactivated and the second LED is activated and to suppress processing of the PPG signal for an oxygen saturation calculation and a pulse rate calculation while the first LED is deactivated and the second LED is activated.
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Specification