Apparatus and method for measuring an analyte such as bilirubin, using light
First Claim
1. An analyte measuring device, comprising multiple narrow band light sources and multiple detector assemblies, whereinthe multiple detector assemblies include:
- a first detector assembly configured to receive light emitted by the multiple narrow band light sources and reflected by a subject, the first detector assembly including a first filter coupled to a first photodetector, wherein the first filter is configured such that light having wavelengths in a main transmission band of the first filter passes through and such that light having wavelengths in one or more transmission sidebands of the first filter passes through;
a second detector assembly configured to receive light emitted by the multiple narrow band light sources and reflected by the subject, the second detector assembly including a second filter coupled to a second photodetector, wherein the second filter is configured such that light having wavelengths in a main transmission band of the second filter passes through and such that light having wavelengths in one or more transmission sidebands of the second filter passes through; and
a third detector assembly configured to receive light emitted by the multiple narrow band light sources and reflected by the subject, the third detector assembly including a third filter coupled to a third photodetector, wherein the third filter is configured such that light having wavelengths in a main transmission band of the third filter passes through and such that light having wavelengths in one or more transmission sidebands of the third filter passes through; and
the multiple narrow band light sources include;
a first narrow band light source being structured to emit a first narrow band spectrum of light covering a first set of wavelengths, wherein the first set of wavelengths includes wavelengths that fall within the main transmission band of one or more of the first filter, the second filter, and the third filter, and wherein the first set of wavelengths does not include any wavelengths that fall within the transmission sidebands of the first filter, the second filter, or the third filter; and
a second narrow band light source being structured to emit a second narrow band spectrum of light covering a second set of wavelengths, wherein the second set of wavelengths includes wavelengths that fall within the main transmission band of one or more of the first filter, the second filter, and the third filter and wherein the second set of wavelengths does not include any wavelengths that fall within the transmission sidebands of the first filter, the second filter, or the third filter;
wherein one or both of the first narrow band light source and the second narrow band light source being structured to emit a narrow band spectrum of light covering wavelengths that fall within the main transmission bands of at least two of the filters.
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Abstract
An analyte measuring device (5) for monitoring, for example, levels of a tissue analyte (e.g., bilirubin), includes a number of narrow band light sources (10), each narrow band light source being structured to emit a spectrum of light covering a number of wavelengths, and a number of detector assemblies (15) configured to receive light reflected from the transcutaneous tissues of a subject. Each of the detector assemblies includes a filter (20) and a photodetector (25), each filter being structured to transmit a main transmission band and one or more transmission sidebands, wherein for each narrow band light source the spectrum thereof includes one or more wavelengths that fall within the transmission band of at least one of the filters, and wherein for each narrow band light source the spectrum thereof does not include any wavelengths that fall within the one or more transmission sidebands of any of the optical filters.
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Citations
18 Claims
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1. An analyte measuring device, comprising multiple narrow band light sources and multiple detector assemblies, wherein
the multiple detector assemblies include: -
a first detector assembly configured to receive light emitted by the multiple narrow band light sources and reflected by a subject, the first detector assembly including a first filter coupled to a first photodetector, wherein the first filter is configured such that light having wavelengths in a main transmission band of the first filter passes through and such that light having wavelengths in one or more transmission sidebands of the first filter passes through; a second detector assembly configured to receive light emitted by the multiple narrow band light sources and reflected by the subject, the second detector assembly including a second filter coupled to a second photodetector, wherein the second filter is configured such that light having wavelengths in a main transmission band of the second filter passes through and such that light having wavelengths in one or more transmission sidebands of the second filter passes through; and a third detector assembly configured to receive light emitted by the multiple narrow band light sources and reflected by the subject, the third detector assembly including a third filter coupled to a third photodetector, wherein the third filter is configured such that light having wavelengths in a main transmission band of the third filter passes through and such that light having wavelengths in one or more transmission sidebands of the third filter passes through; and the multiple narrow band light sources include; a first narrow band light source being structured to emit a first narrow band spectrum of light covering a first set of wavelengths, wherein the first set of wavelengths includes wavelengths that fall within the main transmission band of one or more of the first filter, the second filter, and the third filter, and wherein the first set of wavelengths does not include any wavelengths that fall within the transmission sidebands of the first filter, the second filter, or the third filter; and a second narrow band light source being structured to emit a second narrow band spectrum of light covering a second set of wavelengths, wherein the second set of wavelengths includes wavelengths that fall within the main transmission band of one or more of the first filter, the second filter, and the third filter and wherein the second set of wavelengths does not include any wavelengths that fall within the transmission sidebands of the first filter, the second filter, or the third filter; wherein one or both of the first narrow band light source and the second narrow band light source being structured to emit a narrow band spectrum of light covering wavelengths that fall within the main transmission bands of at least two of the filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of measuring an analyte of a subject, comprising:
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directing light from multiple narrow band light sources including a first narrow band light source and a second narrow band light source toward the subject, wherein individual ones of the multiple narrow band light sources emit a narrow-band spectrum of light covering a number of wavelengths, wherein responsive to the directing, emitted light is reflected by the subject; filtering the reflected light using multiple filters, the filters including a first filter coupled to a first photodetector, a second filter coupled to a second photodetector, and a third filter coupled to a third photodetector, wherein individual ones of the multiple filters have a main transmission band and one or more transmission sidebands, wherein; for individual ones of the multiple narrow band light sources the emitted narrow-band spectrum includes one or more wavelengths that fall within the main transmission band of at least one of the multiple filters, wherein one or both of the first narrow band light source and the second narrow band light source being structured to emit a narrow band spectrum of light covering wavelengths that fall within the main transmission bands of at least two of the filters, and for individual ones of the multiple narrow band light sources the emitted narrow-band spectrum does not include any wavelengths that fall within the one or more transmission sidebands of any of the multiple filters, the filtering producing a filtered light associated with individual ones of the multiple filters; and determining a measurement relating to the analyte based on the filtered light associated with individual ones of the multiple filters. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification