Apparatus for recognizing abnormal tissue using the detection of early increase in microvascular blood content

• US 20070129615A1
• Filed: 11/27/2006
• Published: 06/07/2007
• Est. Priority Date: 10/27/2005
• Status: Abandoned Application

• Current Assignee: Northshore University Healthsystem (Advocate Aurora Health, Inc.)
• Original Assignee: Evanston Northwestern Healthcare Corporation, Northwestern University
• Inventors: Liu, Yang, Backman, Vadim, Roy, Hemant, Kim, Young
• Application Number:
  US11/604,659
• Publication Number:
  US 20070129615A1
• Time in Patent Office: Days
• US Class Current: 600/315
• CPC Class Codes: A61B 2560/0443 Modular apparatus
• CPC Class Codes: A61B 2562/0242 for varying or adjusting the optical path length in the tissue
• CPC Class Codes: A61B 5/0075 by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy A61B5/0071 takes precedence
• CPC Class Codes: A61B 5/0084 for introduction into the body, e.g. by catheters A61B5/1459 takes precedence
• CPC Class Codes: A61B 5/0091 for mammography
• CPC Class Codes: A61B 5/0261 using optical means, e.g. infrared light
• CPC Class Codes: A61B 5/1459 invasive, e.g. introduced into the body by a catheter A61B5/1464 takes precedence
• CPC Class Codes: G01N 33/48 Biological material, e.g. blood, urine G01N33/02, G01N33/26, G01N33/44, G01N33/46 take precedence; Haemocytometers counting blood corpuscules distributed over a surface by scanning the surface G06M11/02

Abstract

The present invention relates to probe apparatuses and component combinations thereof that are used to recognize possibly abnormal living tissue using a detected early increase in microvascular blood supply and corresponding applications. In one embodiment there is disclosed an apparatus that emits broadband light obtained from a light source onto microvasculature of tissue disposed within a human body and receives interacted light that is obtained from interaction of the broadband light with the microvasculature for transmission to a receiver. Different further embodiments include combinations of optical fibers, polarizers and lenses that assist in the selection of a predetermined depth profile of interacted light. In another embodiment, a kit apparatus is described that has various probe tips and/or light transmission elements that provide for various combinations of predetermined depth profiles of interacted light. In a further embodiment, a method of making a spectral data probe for a depth range detection selectivity for detection of blood within microvasculature of tissue is described.

Claims

1. An apparatus that emits broadband light obtained from a light source onto microvasculature of tissue of a human body and receives interacted light that is obtained from interaction of the broadband light with the microvasculature for transmission to a receiver, the apparatus comprising:

a probe having an end adapted for insertion into the human body and which illuminates the tissue with the broadband light and receives interacted light that interacts with blood in the microvasculature that is within the tissue, the probe including;

a delivery optical fiber having a delivery numerical aperture for transmitting the broadband light obtained from the light source, the delivery optical fiber having a light delivery end adapted for emission of the broadband light and a light delivery source connection end adapted for connection to the light source;

at least one collection optical fiber having a collection numerical aperture, the collection optical fiber having a light collection end that receives the interacted light and a receiver connection end adapted for connection to the receiver, wherein the light collection end is substantially aligned with and at a predetermined distance from the light delivery end of the delivery optical fiber; and

a lens that is spaced substantially about one focal length of the lens from the light collection end of the collection optical fiber and from the light delivery end of the delivery optical fiber;

wherein the delivery optical fiber and the collection optical fiber and the lens are adapted to collect the interacted light at a collection spot on a surface of the tissue that is within the focal plane of the lens, and wherein the interacted light collected results from interactions with the microvasculature that are substantially at a predetermined penetration depth below the collection spot, and wherein the predetermined penetration depth is obtained in part due to a selected plurality of characteristics, the selected plurality of characteristics including selection of the focal length of the lens and at least one further characteristic from one of the delivery optical fiber, the collection optical fiber, and the lens.

2. The apparatus according to claim 1 wherein the at least one further characteristic is a characteristic of one of the delivery optical fiber and the collection optical fiber, and is either (1) a type of the delivery optical fiber, (2) a type of the collection optical fiber, (3) the delivery and collection numerical apertures, (4) the substantial alignment of the light delivery end of the delivery optical fiber and the light collection end of the collection optical fiber, and (4) the predetermined distance between the light delivery end of the delivery optical fiber and the light collection end of the collection optical fiber.

3. The apparatus according to claim 1 wherein the at least one further characteristic is a lens characteristic and is at least one of (1) a type of lens and (2) a spacing between the lens and the tissue.

4. The apparatus according to claim 1 wherein there is one and only one collection optical fiber.

5. The apparatus according to claim 4 wherein the delivery numerical aperture and the collection numerical aperture are the same.

6. The apparatus according to claim 1 wherein there are two and only two collection optical fibers.

7. The apparatus according to claim 6 wherein the two collection optical fibers have the same collection numerical aperture and the light collection end of each collection optical fiber is substantially aligned with and substantially at a same predetermined distance from the light delivery end of the delivery optical fiber.

8. The apparatus according to claim 7 further including first and second polarizers disposed between the lens and the delivery and collection optical fibers, the first polarizer providing polarization of the emitted broadband light and the interacted light that is directed to one of the two collection optical fibers and the second polarizer providing polarization of the interacted light that is directed to the other of the two collection optical fibers, and wherein the inclusion of the first and second polarizers and the polarization of each are further ones of the selected plurality of characteristics.

9. The apparatus according to claim 7 further including first and second polarizers disposed between the lens and the delivery and collection optical fibers, the first polarizer providing polarization of the emitted broadband light and the second polarizer providing polarization of the interacted light that is directed to at least one of the two collection optical fibers, and wherein the inclusion of the first and second polarizers and the polarization of each are further ones of the selected plurality of characteristics.

10. The apparatus according to claim 9 further including a third polarizer disposed between the other of the two collection optical fibers and the lens, the third polarizer providing polarization of the interacted light that is directed to the other of the two collection optical fibers, and wherein the inclusion of the third polarizer and the polarization of the third polarizer are further ones of the selected plurality of characteristics.

11. The apparatus according to claim 8 wherein the substantial alignment is on a same plane.

12. The apparatus according to claim 11 wherein the substantially about one focal length is one focal length for each of the light collection ends of the collection optical fibers and the light delivery end of the delivery optical fiber.

13. The apparatus according to claim 11 wherein the substantially about one focal length is greater than one focal length for each of the light collection ends of the collection optical fibers and the light delivery end of the delivery optical fiber.

14. The apparatus according to claim 11 wherein the substantially about one focal length is less than one focal length for each of the light collection ends of the collection optical fibers and the light delivery end of the delivery optical fiber.

15. The apparatus according to claim 8 wherein the substantial alignment provides for the delivery end of the delivery optical fiber to protrude farther than the light collection ends of the collection optical fibers.

16. The apparatus according to claim 8 wherein the substantial alignment provides for the light collection ends of the collection optical fibers to protrude farther than the delivery end of the delivery optical fiber.

17. The apparatus according to claim 8 wherein a depth of the blood content in microvascular tissue that is detected is between 0 and 250 rnicrons.

18. The apparatus according to claim 8 wherein the first and second polarizers are orthogonal to each other.

19. The apparatus according to claim 8 wherein the first and second polarizers are at angles to each other that are different than 90 degrees and 45 degrees.

20. The apparatus according to claim 8, the apparatus wherein the receiver collects differently polarized spectral components of the interacted light.

21. The apparatus according to claim 20 wherein the receiver includes means for using the different polarization components to create polarization gated spectral data.

22. The apparatus according to claim 20 wherein the receiver includes a linear array CCD detector.

23. The apparatus according to claim 8 wherein the collection end of each collection optical fiber is symmetrically spaced around the light delivery end of the delivery optical fiber.

24. The apparatus according to claim 8 wherein the light source emits at least two wavelength ranges of light.

25. The apparatus according to claim 24 wherein the two wavelength ranges are such that one of them includes 542, 555 and 576 nm wavelengths and the other includes wavelengths longer than 576 nm.

26. The apparatus according to claim 1 wherein the light source emits at least two wavelength ranges of light.

27. The apparatus according to claim 26 wherein the two wavelength ranges are such that one of them includes 542, 555 and 576 nm wavelengths and the other includes wavelengths shorter than 542 nm.

28. The apparatus according to claim 1 wherein the light source obtains the broadband light from a plurality of narrowband light sources.

29. The apparatus according to claim 1 wherein the probe further includes a polarizer disposed between the lens and the delivery and collection optical fibers, the polarizer allowing for at least one of adjustment of polarization of the emitted broadband light and for polarization of the interacted light.

30. An apparatus according to claim 8, wherein the delivery optical fiber and the collection optical fiber are formed as one interchangeable optical transmission element having a device connection end and a detection end, the detection end including the light delivery end and the light connection end of the delivery optical fiber and the collection optical fiber, respectively;

wherein the lens is formed as one interchangeable probe tip assembly, and wherein there is at least one of (a) a plurality of interchangeable probe tip assemblies including the one interchangeable probe tip assembly and (b) a plurality of interchangeable optical transmission elements including the one interchangeable optical transmission element,

wherein each of the plurality of interchangeable probe tip assemblies and each of the plurality of interchangeable optical transmission elements having a different characteristic selected to assist with the detection of the interacted light at different tissue penetration depths so that coupling of a particular interchangeable fiber transmission element to a particular interchangeable probe tip assembly will provide for detection of interacted light at a particular tissue penetration depth.

31. The apparatus according to claim 30 wherein there is a plurality of probe tip assemblies.

32. The apparatus according to claim 31 wherein at least some of the interchangeable probe tip assemblies further include a polarizer disposed between the lens and the delivery and collection optical fibers, the polarizer providing for a further different characteristic of the at least some probe tip assemblies.

33. The apparatus according to claim 32 wherein the polarizer is adapted for at least one of adjustment of polarization of the emitted broadband light and for polarization of the interacted light.

34. The apparatus according to claim 31 where a further different characteristic is a distance between the device connection end and a focal plane of the lens for at least some of the plurality of probe tip assemblies.

35. The apparatus according to claim 31 where a further different characteristic is a distance between a focal plane of the lens and a surface of the tissue surface.

36. The apparatus according to claim 34 wherein an outer spacer is used to ensure the distance between the focal plane of the lens and the surface of the tissue surface for at least some of the plurality of probe tip assemblies.

37. The apparatus according to claim 31 wherein one lens in one of the probe tip assemblies has a larger focal length than another lens in another of the probe tip assemblies to obtain a larger spot size of the emitted broadband light.

38. The apparatus according to claim 31 wherein at least one of the optical transmission elements includes two and only two collection optical fibers.

39. The apparatus according to claim 31 where a further different characteristic is a distance between light collection end of each of the two collection optical fibers and the light delivery end of the delivery optical fiber.

40. The apparatus according to claim 39 wherein the distance between the light collection end of each of the two collection optical fibers and the light delivery end of the delivery optical fiber is the same.

41. The apparatus according to claim 38 wherein at least some of the interchangeable probe tip assemblies further include first and second polarizers disposed between the lens and the delivery and collection optical fibers, wherein the first and second polarizers providing for a further different characteristic of the at least some probe tip assemblies.

42. The apparatus according to claim 41, wherein the first polarizer provides polarization of the emitted broadband light and the interacted light that is directed to one of the two collection optical fibers and the second polarizer provides polarization of the interacted light that is directed to the other of the two collection optical fibers.

43. The apparatus according to claim 38 where a further different characteristic is a distance between the light connection end and a focal plane of the lens for at least some of the plurality of probe tip assemblies.

44. The apparatus according to claim 38 where a further different characteristic is a distance between a focal plane of the lens and a surface of the tissue surface.

45. The apparatus according to claim 43 wherein an outer spacer is used to ensure the distance between the focal plane of the lens and the surface of the tissue surface for at least some of the plurality of probe tip assemblies.

46. The apparatus according to claim 38 wherein one lens in one of the probe tip assemblies has a larger focal length than another lens in another of the probe tip assemblies to obtain a larger spot size of the emitted broadband light.

47. The apparatus according to claim 38 where a further different characteristic is a distance between the device connection end and a focal plane of the lens for at least some of the plurality of probe tip assemblies.

48. The apparatus according to claim 38 where a further different characteristic is a distance between a focal plane of the lens and a surface of the tissue surface.

49. The apparatus according to claim 48 wherein an outer spacer is used to ensure the distance between the focal plane of the lens and the surface of the tissue surface for at least some of the plurality of probe tip assemblies.

50. The apparatus according to claim 30 wherein there are a plurality of fiber transmission elements.

51. The apparatus according to claim 50 wherein the different characteristic of at least some of the fiber transmission elements is numerical aperture.

52. The apparatus according to claim 51wherein each of the delivery and collection optical fibers of a particular fiber transmission element have the same numerical aperture.

53. The apparatus according to claim 50 wherein the different characteristic of at least some of the fiber transmission elements is spacing between the delivery optical fiber and each of the at least two collection fibers.

54. The apparatus according to claim 53 wherein the spacing allows for an angular range detection difference of at least 4 degrees between at least two different ones of the fiber delivery elements.

55. The apparatus according to claim 50 wherein the different characteristic of at least some of the fiber transmission elements is a diameter of each of the delivery and collection optical fibers.

56. The apparatus according to claim 30 wherein there is a plurality of probe tip assemblies and a plurality of fiber transmission elements.

57. The apparatus according to claim 1 wherein the at least one collection optical fiber is a plurality of collection optical fibers, the plurality of optical fibers including a plurality of paired collection optical fibers, each paired collection optical fiber having a distance between the light collection end of each of the two paired collection optical fibers and the light delivery end of the delivery optical fiber that is the same, and each of the plurality of paired collection optical fibers having a different distance.

58. A method of making a spectral data probe for a depth range detection selectivity for detection of blood within microvasculature of tissue, the spectral data probe receiving broadband light from a light source and providing interacted light to a receiver, the method comprising the steps of:

determining the depth range that is desired for the detection of the interacted light;

providing the spectral data probe, the spectral data probe including;

a delivery optical fiber for transmitting the broadband light obtained from the light source, the delivery optical fiber having a delivery light output end adapted for connection to the light source and a delivery light source connection end;

a collection fiber group, the collection fiber group including at least one collection optical fiber, each collection optical fiber having a light collection end that receives the interacted light that interacts with the blood in the microvasculature that is within the tissue and a receiver connection end, wherein each light collection end is substantially aligned with and substantially at a predetermined distance from the light delivery end of the delivery optical fiber; and

a lens that is spaced substantially about one focal length of the lens from each light collection end of each collection optical fiber and from the delivery light output end of the delivery optical fiber;

wherein the step of providing selects different characteristics for the delivery optical fiber, the collection fiber group and the lens to assist with allowing the spectral data probe to have the determined depth range.