Multiple wavelength sensor substrate
First Claim
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1. A physiological sensor comprising:
- a plurality of emitters configured to transmit optical radiation having a plurality of wavelengths in response to a corresponding plurality of drive currents;
a thermal mass disposed proximate the emitters so as to stabilize a bulk temperature for the emitters; and
a temperature sensor thermally coupled to the thermal mass, wherein the temperature sensor provides a temperature sensor output responsive to the bulk temperature so that the wavelengths are determinable as a function of the drive currents and the bulk temperature.
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Abstract
A physiological sensor has emitters configured to transmit optical radiation having multiple wavelengths in response to corresponding drive currents. A thermal mass is disposed proximate the emitters so as to stabilize a bulk temperature for the emitters. A temperature sensor is thermally coupled to the thermal mass. The temperature sensor provides a temperature sensor output responsive to the bulk temperature so that the wavelengths are determinable as a function of the drive currents and the bulk temperature.
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Citations
15 Claims
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1. A physiological sensor comprising:
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a plurality of emitters configured to transmit optical radiation having a plurality of wavelengths in response to a corresponding plurality of drive currents;
a thermal mass disposed proximate the emitters so as to stabilize a bulk temperature for the emitters; and
a temperature sensor thermally coupled to the thermal mass, wherein the temperature sensor provides a temperature sensor output responsive to the bulk temperature so that the wavelengths are determinable as a function of the drive currents and the bulk temperature. - View Dependent Claims (2, 3, 4)
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5. A physiological sensor capable of emitting light into tissue and producing an output signal usable to determine one or more physiological parameters of a patient, the physiological sensor comprising:
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a thermal mass;
a plurality of light emitting sources thermally coupled to the thermal mass, the sources having a corresponding plurality of operating wavelengths;
a temperature sensor thermally coupled to the thermal mass and capable of determining a bulk temperature for the thermal mass, the operating wavelengths dependent on the bulk temperature; and
a detector capable of detecting light emitted by the light emitting sources after tissue attenuation, wherein the detector is capable of outputting a signal usable to determine one or more physiological parameters of a patient based upon the operating wavelengths. - View Dependent Claims (6, 7, 8)
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9. In a physiological sensor adapted to determine a physiological parameter using a plurality of light emitting sources with emission wavelengths affected by one or more dynamic operating parameters, a sensor method comprising:
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transmitting optical radiation from the plurality of light emitting sources into body tissue;
detecting the optical radiation after tissue attenuation; and
determining a plurality of operating wavelengths of the light emitting sources dependent on a bulk temperature of the light emitting sources so that one or more physiological parameters of a patient can be determined based upon the operating wavelengths. - View Dependent Claims (10, 11, 12)
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13. In a physiological sensor adapted to determine a physiological parameter using a plurality of light emitting sources with emission wavelengths affected by one or more dynamic operating parameters, a sensor method comprising:
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transmitting optical radiation from the plurality of light emitting sources into body tissue;
detecting the optical radiation after tissue attenuation; and
indicating an operating wavelength for each of the plurality of light emitting sources. - View Dependent Claims (14, 15)
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Specification