System and method for locating and accessing a blood vessel

• US 20050281445A1
• Filed: 12/22/2004
• Published: 12/22/2005
• Est. Priority Date: 01/16/2004
• Status: Active Grant

• Current Assignee: Syris Scientific, LLC
• Original Assignee: Syris Scientific, LLC
• Inventors: Pelletier, Dominic, Arsenault, Mark, Waner, Milton, Hebold, Walter, Marcotte, Ronald, Fink, Louis
• Granted Patent: US 7,532,746 B2
• Time in Patent Office: Days
• US Class Current: 382/128
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/150748 Having means for aiding positioning of the piercing device at a location where the body is to be pierced means for aiding positioning of devices for bringing media into the body A61M5/427, locating blood vessels A61B5/489
• CPC Class Codes: A61B 5/489 Blood vessels
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: G06T 2207/10048 Infrared image
• CPC Class Codes: G06T 2207/30101 Blood vessel; Artery; Vein; Vascular
• CPC Class Codes: G06T 5/00 Image enhancement or restoration
• CPC Class Codes: G06T 5/004 Unsharp masking
• CPC Class Codes: G06T 5/009 Global, i.e. based on properties of the image as a whole applied in cameras using an electronic image sensor H04N23/80, H04N23/70
• CPC Class Codes: G06T 5/10 using non-spatial domain filtering
• CPC Class Codes: G06T 5/20 using local operators
• CPC Class Codes: G06T 5/75 Unsharp masking
• CPC Class Codes: G06T 5/92 based on global image properties

Abstract

An imaging system for locating subcutaneous blood vessels and a method for locating subcutaneous blood vessels using the system. The system includes at least one infrared emitter an infrared detector, a computing unit that enhances images and outputs enhanced images in substantially real time, a display device for displaying enhanced images, and a power source. The method includes the steps of preparing a body target area, putting on the headset, powering up the system, locating a target blood vessel, inserting a needle into the target blood vessel, and performing the medical procedure.

Claims

1. An imaging system for locating subcutaneous blood vessels, said system comprising:

at least one infrared emitter configured to illuminate a region under a surface of a skin with waves of infrared light;

an infrared detector configured to accept waves of infrared light reflected from the region under the surface of the skin, said infrared detector comprising an output for outputting a signal corresponding to unenhanced image data;

a computing unit comprising an input for accepting said unenhanced image data, a memory, means for enhancing said unenhanced image data and outputting result images in which enhanced images of blood vessels are shown within images of the region under the surface of the skin, and an output for outputting said enhanced images in substantially real time;

a display device for inputting said enhanced images from output of said computing unit and displaying said enhanced images; and

a power source in electrical communication with said infrared emitter, said infrared detector, said computing unit and said display device.

2. The system of claim 1 wherein said means for enhancing and outputting result images comprises a digital signal processing unit programmed with computer program means for enhancing and outputting result images at a rate of at least five frames per second.

3. The system of claim 2 wherein said computer program means comprises:

program means for Gaussian blurring a raw image with a kernel radius of 15;

program means for adding an inverse Gaussian-blurred image to the raw image; and

program means for level adjusting a result image to use an entire dynamic range.

4. The system of claim 1 further comprising a headset, wherein said at least one infrared emitter, said infrared detector, said computing unit, said display, and said power source are attached to said headset, and wherein said display is disposed such that a user is able to view both said display and the surface of the skin without removing said headset.

5. The system of claim 4 wherein said at least one infrared emitter comprises two arrays of light emitting diodes.

6. The system of claim 5 wherein said light emitting diodes are surface mounted light emitting diodes comprising integral micro reflectors.

7. The system of claim 6 further comprising at least one light shaping diffuser disposed between said at least one array of surface mounted light emitting diodes and the surface of the skin.

8. The system of claim 7 further comprising at least one first polarizing filter disposed between said at least one array of surface mounted light emitting diodes and the surface of the skin

9. The system of claim 8 further comprising at least one second polarizing filter disposed between the surface of the skin and said infrared detector.

10. The system of claim 9 further comprising a camera lens disposed between the surface of the skin and said infrared detector.

11. The system of claim 5 further comprising a pair of extension arms extending from said headset and a mounting surface pivotally attached to said pair of extension arms, and wherein said two arrays of light emitting diodes and said infrared detector are attached to said mounting surface.

12. The system of claim 6 further comprising a pair of extension arms extending from said headset and a mounting surface pivotally attached to said pair of extension arms, wherein said infrared detector comprises a CMOS camera, and wherein said two arrays of surface mounted light emitting diodes and said CMOS camera are attached to said mounting surface.

13. The system of claim 4 further comprising at least one first polarizing filter disposed between said at least one array infrared emitter and the surface of the skin

14. The system of claim 13 further comprising at least one second polarizing filter disposed between the surface of the skin and said infrared detector.

15. The system of claim 14 further comprising a camera lens, wherein said infrared detector comprises a CMOS camera adapted to generate digital data corresponding to said waves of infrared light reflected from the subcutaneous blood vessels located in the region under the surface of the skin, and wherein said camera lens is disposed between the surface of the skin and said CMOS camera.

16. The system of claim 15 wherein said CMOS camera comprises a high band pass filter adapted to eliminate substantially all light outside of an infrared spectrum from said signal corresponding to said unenhanced image data.

17. The system of claim 4 wherein said infrared detector comprises a CMOS camera adapted to generate digital data corresponding to said waves of infrared light reflected from subcutaneous blood vessels located in the region under the surface of the skin.

18. The system of claim 17 wherein said CMOS camera comprises a high pass filter adapted to eliminate substantially all light outside of an infrared spectrum from said signal corresponding to said unenhanced image data

19. The system of claim 18 further comprising at least one first polarizing filter disposed between said at least one infrared emitter and the surface of the skin.

20. The system of claim 19 further comprising a camera lens disposed between the surface of the skin and said CMOS camera.

21. The system of claim 4 wherein said display comprises at least one LCD screen.

22. The system of claim 21 further comprising an optical lens disposed between said LCD screen and an eye of a user.

23. The system of claim 21 wherein said display comprises a pair of LCD screens.

24. The system of claim 23 further comprising a pair of optical lenses disposed between said LCD screens and a pair of eyes of a user.

25. The system of claim 1 wherein said infrared detector is a CMOS camera adapted to generate digital data corresponding to said waves of infrared light reflected from the subcutaneous blood vessels located in the region under the surface of the skin.

26. The system of claim 25 further comprising at least one first polarizing filter disposed between said at least one infrared emitter and the surface of the skin.

27. The system of claim 26 further comprising at least one second polarizing filter disposed between the surface of the skin and said CMOS camera.

28. The system of claim 25 further comprising a camera lens disposed between the surface of the skin and said CMOS camera.

29. The system of claim 25 wherein said CMOS camera comprises a high pass filter adapted to filter out substantially all light outside of an infrared spectrum.

30. The system of claim 1 wherein said computing unit further comprises image data storage means for storing multiple images for future viewing.

31. The system of claim 1 wherein said computing unit further comprises an interface and wherein said means for enhancing and outputting result images comprises a digital signal processing unit.

32. The system of claim 31 further comprising a data output in communication with said digital signal processing unit through said interface.

33. The system of claim 32 further comprising a data input in communication with said digital signal processing unit through said interface.

34. The system of claim 31 further comprising a data input in communication with said digital signal processing unit through said interface.

35. The system of claim 1 further comprising a data input, wherein said means for enhancing and outputting result images comprises a digital signal processing unit and wherein said data input is in communication With said digital signal processing unit.

36. A method of using an imaging system to aid in an insertion of a needle into a blood vessel during a performance of a medical procedure, wherein the imaging system comprises a headset, at least one infrared emitter, an infrared detector, a computing unit, a power source, and a display disposed such that a user is able to view both an enhanced image on the display and an unenhanced image on the target area of a surface of a skin of a patient without removing said headset, and wherein said method comprises the steps of:

preparing a body target area;

putting on the headset;

powering up the system;

locating a target blood vessel by viewing an image of the body target area on the display of the system;

inserting the needle into the target blood vessel; and

performing the medical procedure.

37. The method of claim 36 wherein the infrared detector of the system comprises a camera, and wherein said step of locating a target blood vessel comprises the steps of:

directing incident light from the infrared emitters on the target area of the surface of the skin; and

viewing the target area on the display.

38. The method of claim 37 wherein the display comprises an optical lens and wherein said step of locating a target blood vessel further comprises the steps of:

viewing the image of the target area of the skin as displayed on the display;

viewing the unenhanced image on the target area of the skin;

adjusting the optical lens to correct the enhanced image displayed on display for depth perception differences between the enhanced image and the unenhanced image.

39. The method of claim 37 wherein said step of locating a target blood vessel further comprises the steps of:

viewing the image of the target area of the skin as displayed on the display;

viewing the unenhanced image on the target area of the skin;

adjusting the display to correct the enhanced image displayed on display for depth perception differences between the enhanced image and the unenhanced image.

40. The method of claim 36 further comprising the step of optimizing the system, wherein the computing unit comprises a digital signal processor and a memory, wherein the system comprises a data input, and wherein said step of optimizing the system comprises the step of using the data input to specify an enhancement algorithm stored in memory to be used by the digital signal processor to generate the enhanced image.

41. The method of claim 40 wherein said step of optimizing the system further comprises the step of selecting an enhancement algorithm based upon a factor selected from a group consisting of a body type, pigmentation, and age of the patient.

42. The method of claim 41 wherein the computing unit comprises a digital signal processor and a memory, wherein the system comprises a data input, and wherein said step of optimizing the system comprises the step of using the data input to adjust an intensity level of the at least one infrared emitter.

43. The method of claim 36 further comprising the step of optimizing the system, wherein the computing unit comprises a digital signal processor and a memory, wherein the system comprises a data input, and wherein said step of optimizing the system comprises the step of using said data input to adjust an intensity level of the at least one infrared emitter.

44. The method of claim 36 wherein the needle is an infrared viewable needle and wherein said step of inserting a needle into the target blood vessel further comprises viewing the infrared viewable needle on the display during and after insertion into the target blood vessel.