Method for determination of analytes using NIR, adjacent visible spectrum and discrete NIR wavelenths

• US 6,741,876 B1
• Filed: 06/28/2002
• Issued: 05/25/2004
• Est. Priority Date: 08/31/2000
• Status: Expired due to Fees

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: CME Telemetrix, Inc.
• Inventors: Scecina, Thomas, Pawluczyk, Romauld, Cadell, Theodore E.
• Primary Examiner(s): WINAKUR, ERIC FRANK
• Application Number:
  US10/070,187
• Time in Patent Office: 697 Days
• Field of Search: 600/310, 600/316, 600/322, 600/323, 600/473, 356/39, 356/300, 356/319, 356/320, 356/326, 356/328, 250/339.01, 250/339.02, 250/339.05, 250/339.06, 250/339.07, 250/339.11, 250/339.12, 250/340, 250/341.1, 250/341.2, 250/341.8
• US Class Current: 600/316
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/14546 for measuring analytes not otherwise provided for, e.g. ions, cytochromes
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters

Abstract

Described is a method for measuring the concentration of a blood constituent within a body part (80) of a living subject which comprises irradiating a body part of the subject with a continuum of a broad spectrum of radiation in adjacent and near infrared range of the electomagnetic spectrum; collecting the band of radiation after the radiation has been directed onto the part; dispersing the continuum of collected radiation into a dispersed spectrum of component wavelengths onto a detector (120) the detector taking measurements of at least one of transmitted or reflected radiation from the collected radiation; and transferring the measurements to a processor (300), and then measuring the same kind of absorbance or reflectance with respect to one or more a discrete wavelengths of radiation from the longer near infrared range and using the measurements to calculate the concentration of the constituent.

Claims

1. A method for determining a concentration of a constituent in a tissue of a subject comprising the steps of:

irradiating the tissue with a broad spectrum of radiation in the AV and NIR region from a first source of radiation;

irradiating the tissue with radiation in the longer wavelength NIR region from a second source of radiation;

measuring with a detector transmitted or radiation from the tissue at a continuum of wavelengths in the AV and NIR region and at one, or more than one discrete wavelength in the longer wavelength NIR region, wherein the continuum of wavelengths in the AV and NIR region is between 500 and 1100 nm, and wherein the one, or more than one discrete wavelength is between 1590 and 1700 nm; and

calculating the concentration of the constituent on the basis of the measurements, thereby determining the concentration of the constituent in the tissue,

wherein said first and second sources are approximately oppositely disposed to said detector.

2. A method according to claim 1, wherein the discrete wavelength measurements are at 1595, 1610 and 1620 nm.

3. A method according to claim 1 wherein the radiation at each discrete wavelength is provided by a separate energy source.

4. A method according to claim 1 wherein the radiation at each of the discrete wavelengths is provided sequentially.

5. A method according to claim 1 wherein the radiation at all of the discrete wavelengths is provided simultaneously.

6. A method according to claim 1 wherein a single energy source provides radiation in the range of 500 to 1300 nm.

7. A method according to claim 1 wherein the steps of irradiating the tissue in the AV and NIR region, and in the longer wavelength NIR region, are done simultaneously, and the measurement in each of said AV and NIR region and said longer wavelength NIR region is made simultaneously.

8. A method according to claim 1 wherein the subject is a human and the body part is a finger.

9. A method according to claim 1 wherein the constituent is glucose, and the tissue is blood.

10. A method for measuring concentration of a blood constituent within a body part of a living subject comprising:

irradiating a body part of the subject with a broad spectrum of radiation in the AV and NIR region from a first source of radiation;

collecting the radiation from the AV and NIR region after the radiation has been directed onto the part, wherein the collected radiation comprises a band of radiation from 500 to 1100 nm;

dispersing the collected radiation into a dispersed spectrum of component wavelengths onto a detector, the detector taking measurements transmitted and radiation from the collected radiation;

transferring the measurements to a processor;

irradiating the body part of the subject with radiation in the longer wavelength NIR region from a second source of radiation;

detecting with the detector one, or more than one discrete wavelength in the longer wavelength NIR region after the radiation has been directed onto the part, wherein the one, or more than one discrete wavelength is between 1590 and 1700 nm, the detector taking measurements of transmitted and reflected radiation; and

transferring the measurements to a processor;

based on the measurements and one or more calibration algorithms, the processor calculating the concentration of said constituent of said blood, wherein said first and second sources are approximately oppositely disposed to said detector.

11. The method according to claim 10 wherein the detector is a linear array detector and the measurement is of absorbed radiation.

12. A method according to claim 10, and wherein the discrete wavelength measurements are at 1595,1610 and 1620 nm.

13. A method according to claim 10 wherein the subject is a human and the body part is a finger.

14. A method according to claim 10 wherein the constituent is glucose, and the tissue is blood.

15. A method for measuring concentration of a blood constituent within a body part of a living subject comprising:

irradiating the body part of the subject with a first continuum of a broad spectrum band of radiation in the AV and NIR region from a first source of radiation;

collecting the first band of radiation after the radiation has been directed onto the part, wherein the first band of radiation collected is between 500 and 1100 nm;

dispersing the continuum of collected radiation into a dispersed spectrum of component wavelengths onto a detector, the detector taking measurements of transmitted and radiation from the collected radiation; and

transferring the measurements to a processor;

irradiating the body part of the subject with a second continuum of a radiation band in the longer wave NIR region from a second source of radiation;

collecting the second band of radiation after the radiation has been directed onto the part;

dispersing the continuum of collected radiation into a dispersed spectrum of component wavelengths onto the detector;

detecting with the detector one, or more than one discrete wavelengths in the longer wavelength NIR region with the detector, wherein the one, or more than one discrete wavelength is between 1590 and 1700 nm, the detector taking measurements of transmitted and radiation from the collected radiation; and

transferring the measurements to a processor based on the measurements and one or more calibration algorithms, the processor calculating the concentration of said constituent of said blood,

wherein said first and second sources are approximately oppositely disposed to said detector.

16. The method according to claim 15 wherein the detector is a linear array detector and the measurement is of absorbed radiation.

17. A method according to claim 15, wherein the discrete wavelength measurements are at 1595,1610 and 1620 nm.

18. The method according to claim 15 wherein the subject is a human and the body part is a finger.

19. A method according to claim 15 wherein the constituent is glucose, and the tissue is blood.

20. A method for determining a concentration of a constituent in a tissue of a subject comprising the steps of:

irradiating the tissue with a broad spectrum of radiation in the AV and NIR region from a first source of radiation;

irradiating the tissue with radiation in the longer wavelength NIR region from a second source of radiation,

measuring with a detector transmitted or radiation from the tissue at a continuum of wavelengths in the AV and NIR region, at one, or more than one discrete wavelength between 1100 and 1300 nm, and at one, or more than one discrete wavelength between 1590 and 1700 nm, wherein the continuum of wavelengths in the AV and NIR region is between 500 and 1100 nm; and

calculating the concentration of the constituent on the basis of the measurements, thereby determining the concentration of the constituent in the tissue, wherein the first and second sources are approximately oppositely disposed to said detector.

21. A method according to claim 20, wherein the discrete wavelength measurements are at 1150, 1195, 1215, 1230, 1240, and 1250 nm, and at 1595, 1610 and 1620 nm.

22. A method according to claim 20, wherein the radiation at each discrete wavelength is provided by a separate energy source.

23. A method according to claim 20, wherein the radiation at each of the discrete wavelengths is provided sequentially.

24. A method according to claim 20, wherein the radiation at all of the discrete wavelengths is provided simultaneously.

25. A method according to claim 20, wherein a single energy source provides continuous energy over the radiation range of 1100 to 1300 nm.

26. A method according to claim 20, wherein the steps of irradiating the tissue in the AV and NIR region, and in the longer wavelength NIR region, are done simultaneously, and the measurement in each of said AV and NIR region and said longer wavelength NIR region is made simultaneously.

27. The method according to claim 20, wherein the subject is a human and the body part is a finger.

28. A method according to claim 20, wherein the constituent is glucose, and the tissue is blood.

29. A method for measuring concentration of a blood constituent within a body part of a living subject comprising:

irradiating a body part of the subject with a broad spectrum of radiation in the AV and NIR region from a first source of radiation;

collecting the radiation from the AV and NIR region after the radiation has been directed onto the part, wherein the collected radiation comprises a band of radiation between 500 and 1100 nm;

dispersing the collected radiation into a dispersed spectrum of component wavelengths onto a detector, the detector taking measurements of transmitted and radiation from the collected radiation;

transferring the measurements to a processor;

irradiating the body part of the subject with radiation in the longer wavelength NIR region from a second source of radiation;

detecting with the detector one, or more than one discrete wavelength between 1100 and 1300 nm, and one, or more than one discrete wavelength between 1590 and 1700 nm with a detector, the detector taking measurements of transmitted and radiation; and

transferring the measurements to a processor;

based on the measurements and one or more calibration algorithms, the processor calculating the concentration of said constituent of said blood,

wherein the first and second sources are approximately oppositely disposed to said detector.

30. The method according to claim 29, wherein the detector is a linear array detector and the measurement is of absorbed radiation.

31. A method according to claim 29, wherein the discrete wavelength measurements are at 1150, 1195, 1215, 1230, 1240, and 1250 nm, and at 1595, 1610 and 1620 nm.

32. The method according to claim 29, wherein the subject is a human and the body part is a finger.

33. A method according to claim 29, wherein the constituent is glucose, and the tissue is blood.

34. A method for measuring concentration of a blood constituent within a body part of a living subject comprising:

irradiating the body part of the subject with a first continuum of a broad spectrum band of radiation in the AV and NIR region from a first source of radiation;

collecting the first band of radiation after the radiation has been directed onto the part, wherein the first band of radiation collected is between 500 and 1100 nm;

dispersing the continuum of collected radiation into a dispersed spectrum of component wavelengths onto a detector, the detector taking measurements transmitted and radiation from the collected radiation; and

transferring the measurements to a processor;

irradiating the body part of the subject with a second continuum of a radiation band in the longer wave NIR region from a second source of radiation;

collecting the second band of radiation after the radiation has been directed onto the part;

dispersing the continuum of collected radiation into a dispersed spectrum of component wavelengths onto the detector;

detecting with the detector one, or more than one discrete wavelength between 1100 and 1300 nm, and one, or more than one discrete wavelength between 1590 and 1700 nm with a detector, the detector taking measurements of transmitted and radiation; and

transferring the measurements to a processor based on the measurements and one or more calibration algorithms, the processor calculating the concentration of said constituent of said blood,

wherein said first and second sources are approximately oppositely disposed to said detector.

35. The method according to claim 34, wherein the detector is a linear array detector and the measurement is of absorbed radiation.

36. A method according to claim 34, wherein the discrete wavelength measurements are at 1150, 1195, 1215, 1230, 1240, and 1250 nm, and at 1595, 1610 and 1620 nm.

37. The method according to claim 34, wherein the subject is a human and the body part is a finger.

38. A method according to claim 34, wherein the constituent is glucose, and the tissue is blood.