Filtered detector array for optical patient sensors
First Claim
1. A physiological sensor, comprising:
- an emitter configured to emit two or more wavelengths of light having a first polarization into the tissue of a patient;
a charge coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) photodetector array comprising a plurality of photodetectors, wherein each photodetector is configured to receive the light from the tissue of the patient and to produce a corresponding output signal; and
one or more filter layers disposed over the plurality of photodetectors, wherein a first portion of the one or more filter layers is configured to only allow light associated with a first physiological measurement to reach a first portion of the plurality of photodetectors, wherein a second portion of the one or more filter layers is configured to only allow light corresponding to a second physiological measurement to reach a second portion of the plurality of photodetectors, and wherein the one or more filter layers comprise a graded polarization filter layer configured to block a greater amount of light of the first polarization from reaching a portion of photodetector array disposed nearest the emitter.
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Accused Products
Abstract
The present embodiments relate generally to patient monitoring system and, more particularly, to optical patient monitoring systems. In an embodiment, a physiological sensor includes a broadband emitter configured to emit two or more wavelengths of light into the tissue of a patient. The sensor also includes a charge coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) photodetector array comprising a plurality of photodetectors. Each photodetector in the photodetector array is configured to receive the light from the tissue of the patient and to produce a corresponding output signal. Additionally, the sensor also includes one or more filter layers disposed on the plurality of photodetectors. The filter layers are configured to only allow light of particular wavelengths, polarizations, or both, to be received by each of the plurality of photodetectors.
35 Citations
18 Claims
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1. A physiological sensor, comprising:
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an emitter configured to emit two or more wavelengths of light having a first polarization into the tissue of a patient; a charge coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) photodetector array comprising a plurality of photodetectors, wherein each photodetector is configured to receive the light from the tissue of the patient and to produce a corresponding output signal; and one or more filter layers disposed over the plurality of photodetectors, wherein a first portion of the one or more filter layers is configured to only allow light associated with a first physiological measurement to reach a first portion of the plurality of photodetectors, wherein a second portion of the one or more filter layers is configured to only allow light corresponding to a second physiological measurement to reach a second portion of the plurality of photodetectors, and wherein the one or more filter layers comprise a graded polarization filter layer configured to block a greater amount of light of the first polarization from reaching a portion of photodetector array disposed nearest the emitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of measuring a physiological parameter of a patient comprising:
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emitting light into a tissue of the patient using a broadband emitter; filtering the light received from the tissue of the patient using a graded polarization filter layer and one or more multi-segmented filter layers, wherein each segment of the multi-segmented filter layers is configured to block a different portion of the light based on either the wavelength of the light, the polarization of the light, or both, and wherein a portion of the graded polarization filter layer disposed nearest the broadband emitter is configured to block a greater amount of the light having a first polarization; and measuring the light that traverses the graded polarization filter layer and the one or more multi-segmented filter layers using a charge-coupled device (CCD) or complementary metal-oxide semiconductor (CMOS) detector array comprising a plurality of photodetectors. - View Dependent Claims (13, 14)
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15. A patient monitoring system comprising:
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an optical patient sensor comprising; a broadband emitter configured to emit light over a range of wavelengths and having a first polarization into the tissue of a patient; a first plurality of photodetectors disposed below a graded polarization filter layer and a first filter layer, wherein the first plurality of photodetectors is configured to receive a first filtered portion of the light traversing the tissue of the patient, the graded polarization filter layer, and the first filter layer, and configured to produce a corresponding first plurality of output signals; and a second plurality of photodetectors disposed below the graded polarization filter layer and a second filter layer, wherein the second plurality of photodetectors is configured to receive a second filtered portion of the light traversing the tissue of the patient, the graded polarization filter layer, and the second filter layer, and configured to produce a corresponding second plurality of output signals, wherein the graded polarization filter layer is configured to filter a greater amount of light having the first polarization from reaching a portion of the first or second plurality of photodetectors positioned nearest the broadband emitter; and a patient monitor comprising a processor configured to; receive the first and second pluralities of output signals from the first and second pluralities photodetectors; calculate a first physiological parameter of the patient based, at least in part, on the received first plurality of output signals; and calculate a second physiological parameter of the patient based, at least in part, on the received second plurality of output signals. - View Dependent Claims (16, 17, 18)
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Specification