Methods and systems for power optimization in a medical device
First Claim
1. A method of operating a physiological monitor, the method comprising:
- generating a first light drive signal for activating a first light source to emit a first photonic signal of a first wavelength of light, wherein the first light drive signal is in an “
on”
state for a plurality of consecutive physiological pulses;
receiving a first light signal attenuated by a subject, wherein the first light signal comprises a first component corresponding to the first photonic signal;
determining, using a processor, when to activate a second light source based on the first component;
generating, when it is determined to activate the second light source, a second light drive signal for activating the second light source to emit a second photonic signal of a second wavelength of light, wherein the second light drive signal is in an “
off”
state during at least one portion of each of the plurality of consecutive physiological pulses;
receiving a second light signal attenuated by the subject, wherein the second light signal comprises a second component corresponding to the second photonic signal; and
determining, using the processor, a physiological parameter of the subject based on the first and second components of the respective first and second received light signals.
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Accused Products
Abstract
A physiological monitoring system may use photonic signals to determine physiological parameters. The system may vary parameters of a light drive signal used to generate the photonic signal from a light source such that power consumption is reduced or optimized. Parameters may include light intensity, firing rate, duty cycle, other suitable parameters, or any combination thereof. In some embodiments, the system may use information from a first light source to generate a light drive signal for a second light source. In some embodiments, the system may vary parameters in a way substantially synchronous with physiological pulses, for example, cardiac pulses. In some embodiments, the system may vary parameters in response to an external trigger.
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Citations
20 Claims
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1. A method of operating a physiological monitor, the method comprising:
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generating a first light drive signal for activating a first light source to emit a first photonic signal of a first wavelength of light, wherein the first light drive signal is in an “
on”
state for a plurality of consecutive physiological pulses;receiving a first light signal attenuated by a subject, wherein the first light signal comprises a first component corresponding to the first photonic signal; determining, using a processor, when to activate a second light source based on the first component; generating, when it is determined to activate the second light source, a second light drive signal for activating the second light source to emit a second photonic signal of a second wavelength of light, wherein the second light drive signal is in an “
off”
state during at least one portion of each of the plurality of consecutive physiological pulses;receiving a second light signal attenuated by the subject, wherein the second light signal comprises a second component corresponding to the second photonic signal; and determining, using the processor, a physiological parameter of the subject based on the first and second components of the respective first and second received light signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a physiological monitor, the method comprising:
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generating a first light drive signal for activating a first light source to emit a first photonic signal; receiving a first light signal attenuated by a subject, wherein the first light signal comprises attenuated light corresponding to the first photonic signal; identifying, using a processor, a systole period of the subject based on the attenuated light of the first light signal; determining, using the processor, when to activate a second light source based on the systole period; generating, when it is determined to activate the second light source, a second light drive signal for activating the second light source to emit a second photonic signal; receiving a second light signal attenuated by the subject, wherein the second light signal comprises attenuated light corresponding to the second photonic signal; and determining, using the processor, a physiological parameter of the subject based on the attenuated light of the respective first and second received light signals. - View Dependent Claims (18, 19, 20)
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Specification