MULTIPLE WAVELENGTH OPTICAL SENSOR
First Claim
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1. A physiological sensor comprising:
- an emitter that emits light having a plurality of wavelengths;
a detector that generates an output signal responsive to the emitted light after absorption by tissue;
an attachment assembly that removably attaches the emitter and the detector to tissue;
a spacer that provides a predetermined gap between the emitter and tissue when the emitter is attached to tissue; and
a light scattering medium disposed in a optical path between the emitter and tissue;
the spacer and the light scattering medium providing at least a substantially uniform illumination of tissue by the emitted light for each of the wavelengths.
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Abstract
A multiple wavelength optical sensor has an emitter configured to radiate light having a plurality of wavelengths into a tissue site. The emitter comprises a plurality of LEDs configured in an array and connected within an electrical grid. A detector is configured to receive the light after absorption by pulsatile blood flow within the tissue site. The detector generates a sensor signal capable of being processed by a patient monitor so as to derive oxygen saturation, carboxyhemoglobin, methemoglobin and total hemoglobin.
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Citations
20 Claims
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1. A physiological sensor comprising:
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an emitter that emits light having a plurality of wavelengths; a detector that generates an output signal responsive to the emitted light after absorption by tissue; an attachment assembly that removably attaches the emitter and the detector to tissue; a spacer that provides a predetermined gap between the emitter and tissue when the emitter is attached to tissue; and a light scattering medium disposed in a optical path between the emitter and tissue; the spacer and the light scattering medium providing at least a substantially uniform illumination of tissue by the emitted light for each of the wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A physiological sensor comprising:
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an emitter configured to radiate light having a plurality of wavelengths into a tissue site; the emitter comprises a plurality of LEDs disposed within an emitter ceramic substrate; a detector configured to receive the light after absorption by pulsatile blood flow within the tissue site; the detector generates a sensor signal capable of being processed by a patient monitor so as to derive total hemoglobin (Hbt); the detector comprises a plurality of photodiodes disposed within a detector ceramic substrate; and a first set of the photodiodes is responsive to a first set of the wavelengths and a second set of the photodiodes is responsive to a second set of the wavelengths. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A physiological sensor comprising:
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a light source that radiates light having a plurality of wavelengths; a diffuser that scatters the radiated light so that a tissue site is uniformly illuminated across all of the wavelengths; and at least one detector that generates a sensor signal responsive to the radiated light after tissue attenuation. - View Dependent Claims (17, 18, 19, 20)
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Specification