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, the temperature sensor providing 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; and
and an optical filter, wherein the optical filter attenuates at least a portion of a wavelength spectrum so as to compensate for an imbalance in an attenuation of the plurality of wavelengths by the tissue site.
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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.
1243 Citations
7 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, the temperature sensor providing 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; and and an optical filter, wherein the optical filter attenuates at least a portion of a wavelength spectrum so as to compensate for an imbalance in an attenuation of the plurality of wavelengths by the tissue site. - 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 disposed within a substrate; a plurality of light emitting sources disposed on the substrate proximate the thermal mass and thermally coupled to the thermal mass, the sources having a corresponding plurality of operating wavelengths; a temperature sensor disposed on the substrate proximate the thermal mass and 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; an optical filter configured to attenuate at least one of the plurality of light emitting sources; 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)
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Specification