Low power pulse oximeter
First Claim
1. A low power pulse oximeter comprising:
- a sensor interface adapted to drive a pulse oximetry sensor and receive a corresponding input signal;
a processor that derives a physiological measurement corresponding to said input signal;
a display driver adapted to communicate said measurement to a display; and
a controller generating a sampling control output to at least one of said sensor interface and said processor so as to reduce the average power consumption of said pulse oximeter consistent with a predetermined power target.
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Accused Products
Abstract
A pulse oximeter adaptively samples an input signal from a sensor in order to reduce power consumption in the absence of overriding conditions. Various sampling mechanisms may be used individually or in combination, including reducing the duty cycle of a drive current to a sensor emitter, intermittently powering-down a front-end interface to a sensor detector, or increasing the time shift between processed data blocks. Both internal parameters and output parameters may be monitored to trigger or override a reduced power consumption state. In this manner, a pulse oximeter can lower power consumption without sacrificing performance during, for example, high noise conditions or oxygen desaturations.
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Citations
36 Claims
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1. A low power pulse oximeter comprising:
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a sensor interface adapted to drive a pulse oximetry sensor and receive a corresponding input signal;
a processor that derives a physiological measurement corresponding to said input signal;
a display driver adapted to communicate said measurement to a display; and
a controller generating a sampling control output to at least one of said sensor interface and said processor so as to reduce the average power consumption of said pulse oximeter consistent with a predetermined power target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A low power pulse oximetry method comprising the steps of:
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storing a power target;
receiving an input signal from a pulse oximetry sensor;
calculating signal status related to said input signal;
calculating power status related to said power target; and
sampling based upon the result of said calculating signal status and said calculating power status steps. - View Dependent Claims (12, 13, 14, 15)
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16. A low power pulse oximetry method comprising the steps of:
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detecting an override related to a measure of signal quality or a physiological measurement event;
increasing said pulse oximeter to a higher power level when said override exists; and
reducing said pulse oximeter to a lower power level if said override does not exist. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A low power pulse oximeter comprising:
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a sensor interface adapted to receive an input signal from a sensor;
a signal processor configured to communicate with said sensor interface and to generate an internal parameter responsive to said input signal; and
a sampling controller responsive to said internal parameter so as to generate a sampling control to alter the power consumption of at least one of said sensor interface and said signal processor. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A low power pulse oximeter comprising:
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an interface means for communicating with a sensor;
a processor means for generating an internal parameter and an output parameter; and
a controller means for selectively reducing the power consumption of at least one of said interface means and said processor means based upon said parameters. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification