Methods and systems for determining a light drive parameter limit in a physiological monitor
First Claim
1. A method for driving a medical sensor for use on a subject, comprising:
- generating a light drive signal with a variable current below a first maximum current limit, the light drive signal being configured to produce an emitted light in a medical sensor;
receiving a sensor signal from the medical sensor, in response to the emitted light;
determining a parameter based on the received sensor signal;
changing the maximum current limit based on the parameter; and
generating the light drive signal in accordance with the changed maximum current limit.
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Abstract
A physiological monitoring system may receive a sensor signal from a physiological sensor. The system may determine a parameter based on the sensor signal, for example variability of a blood oxygen saturation value or the percent modulation of a light signal. The system may determine a light drive parameter limit based on one or more parameters. For example, the system may determine a light drive current limit. The frequency of changes in the limit may be regulated using a state machine and other techniques that include hysteresis. An extant light drive parameter may be updated or changed in accordance with the light drive parameter limit and a light drive signal may be generated based on the light drive parameter.
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Citations
22 Claims
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1. A method for driving a medical sensor for use on a subject, comprising:
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generating a light drive signal with a variable current below a first maximum current limit, the light drive signal being configured to produce an emitted light in a medical sensor; receiving a sensor signal from the medical sensor, in response to the emitted light; determining a parameter based on the received sensor signal; changing the maximum current limit based on the parameter; and generating the light drive signal in accordance with the changed maximum current limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for monitoring a physiological parameter of a subject, comprising:
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driving a medical sensor with a varying current below a first maximum current to emit light into a subject; receiving a sensor signal from the medical sensor in response to the emitted light; determining a plurality of parameters based on the sensor signal; comparing each of the plurality of parameters to a respective threshold or condition; determining, for each of the plurality of parameters, a vote based on whether the parameter meets its respective threshold or condition; combining the votes of the plurality of parameters; reducing the maximum current limit available to the medical sensor based on the combined votes; and driving the medical sensor with varying current below the reduced maximum current limit. - View Dependent Claims (20, 21, 22)
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Specification