Micro-dialysis probe

• US 7,008,398 B2
• Filed: 02/05/2002
• Issued: 03/07/2006
• Est. Priority Date: 08/06/1999
• Status: Expired due to Term

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Disetronic Licensing Ag
• Inventors: Ehwald, Rudolf, Thomas, Andreas, Uwe, Beyer
• Primary Examiner(s): MENDEZ, MANUEL A
• Application Number:
  US10/068,670
• Publication Number:
  US 20020087145A1
• Time in Patent Office: 1,491 Days
• Field of Search: 604/43, 604/44, 604/113, 600/366
• US Class Current: 604/43
• CPC Class Codes: A61B 5/145 Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissuemeasuring of blood pressure or blood flow A61B5/02; non-radiation detecting or locating of foreign bodies in blood A61B5/06
• CPC Class Codes: A61B 5/14528 invasively

Abstract

A micro-dialysis probe extending longitudinally between a proximal probe opening and a distal probe tip and having a supply line and a drainage line for a drip-feed solution. A tube may be provided for supporting the drainage line. A dialysis section, wherein the flow channel for the drip-feed solution experiences an inversion, is formed generally between the supply line and the drainage line, in the vicinity of the distal probe tip. The supply line and the drainage line are arranged substantially side by side and together form the probe shaft of the micro-dialysis probe.

Claims

1. A micro-dialysis probe comprising:

a proximal probe opening providing access to a supply line and a drainage line;

a distal probe tip for introducing the probe into subcutaneous tissue;

a supply line for introducing drip-feed solution into the probe, the supply line having a dialysis opening in the vicinity of the probe tip;

a drainage line formed as a hollow fiber, the hollow fiber being exposed to surrounding tissue in the vicinity of the probe tip;

a dialysis section being formed between the supply line and the drainage line in the area of the supply line dialysis opening and the exposure of the hollow fiber to surrounding tissue;

the drip-feed solution flowing through the supply line experiencing an inversion in the area of the dialysis section and between the supply line and the drainage line,

the supply line and drainage line together forming a probe shaft, the supply line and the drainage line being arranged as separate hollow channels of the probe shaft.

2. The micro-dialysis probe of claim 1, wherein the probe tip is pointed and sealed with a sealing material.

3. The micro-dialysis probe of claim 1, wherein the supply line and the drainage line are fixed to one another using a fixing material in the area of the probe shaft between the proximal probe opening and the dialysis section.

4. The micro-dialysis probe of claim 1, further including a tube surrounding the drainage line, the tube having recesses to expose the hollow fiber to surrounding tissue in the vicinity of the probe tip.

5. The micro-dialysis probe of claim 4, wherein the supply line and the drainage line, together with the tube surrounding the drainage line, are fixed to one another using a fixing material in the area of the probe shaft between the proximal probe opening and the dialysis section.

6. The micro-dialysis probe of claim 1, wherein the supply line and the drainage line each extend substantially linearly.

7. The micro-dialysis probe of claim 1, wherein the supply line and the drainage line are arranged substantially side-by-side.

8. The micro-dialysis probe of claim 1, wherein the hollow fiber of the drainage line penetrates into the supply line proximally of the inversion, the hollow fiber being fixed in the area of the probe tip such that a linear course of flow is achieved distal of the inversion, while proximally of the inversion the hollow fiber is sealed in a tube surrounding the drainage line.

9. The micro-dialysis probe of claim 8, wherein a section of the tube lies over the hollow fiber in the area of the probe tip and thereby forms a supporting section for the hollow fiber.

10. The micro-dialysis probe of claim 9, wherein the supply line and supporting section together form an outer framework that shields the hollow fiber from surrounding tissues.

11. The micro-dialysis probe of claim 1, wherein the hollow fiber is formed to be replaceable and is sealed in the tube.

12. The micro-dialysis probe of claim 1, wherein the shaft formed by the supply line and the drainage line further includes a supporting profile for separating the supply line and the drainage line from each other, the supporting profile including overflow openings in the area of flow inversion.

13. The micro-dialysis probe of claim 12, wherein the profile is star-shaped.

14. The micro-dialysis probe of claim 13, wherein the profile is star-shaped as a three-armed star.

15. The micro-dialysis probe of claim 13, wherein the profile is star-shaped as a four-armed star.

16. The micro-dialysis probe of claim 12, wherein the profile is flat.

17. The micro-dialysis probe of claim 16, wherein the profile comprises bristles or knobs on at least one of its flat sides to support the hollow fiber.

18. The micro-dialysis probe of claim 17, wherein the supply line and the drainage line each extend substantially linearly.

19. A micro-dialysis probe comprising:

a probe shaft having a proximal end and a distal probe tip;

a hollow fiber forming a supply line for introducing drip-feed solution into the probe and

a drainage line, the supply line and drainage line being arranged as separate hollow channels of the probe shaft and together being formed by the shaft itself, the supply line and the drainage line extending substantially side-by-side;

a supporting profile inserted into the hollow fiber, the supporting profile separating the supply line from the drainage line, the supporting profile at least one overflow opening, the drip-feed liquid flowing from the supply line into the drainage line in the area of the overflow opening, the drip-feed liquid there experiencing an inversion.

20. The micro-dialysis probe of claim 19, further comprising a primary dialysis section in the area of flow inversion between the supply line and the drainage line.

21. The micro-dialysis probe of claim 19, further comprising a dialysis section extending from the shaft to the probe tip and within both the supply line and the drainage line.

22. The micro-dialysis probe of claim 19, wherein the supply line and the drainage extend substantially linearly.

23. The micro-dialysis probe of claim 19, wherein the supply line and the drainage line are arranged substantially side-by-side.

24. The micro-dialysis probe of claim 19, wherein the drainage line comprises two drainage channels.

25. The micro-dialysis probe of claim 19, wherein the supply line is accommodated by a supply hose inserted in the probe shaft.

26. The micro-dialysis probe of claim 19, wherein the drainage line is accommodated by a drainage hose inserted in the probe shaft.

27. The micro-dialysis probe of claim 19, wherein the supply line and drainage line are integrated by a fixing material.

28. The micro-dialysis probe of claim 19, further including a supporting profile for separating the supply line and the drainage line from each other, the supporting profile including overflow openings in the area of flow inversion.

29. The micro-dialysis probe of claim 28, wherein the profile is star-shaped.

30. The micro-dialysis probe of claim 29, wherein the profile is star-shaped as a three-armed star.

31. The micro-dialysis probe of claim 29, wherein the profile is star-shaped as a four-armed star.

32. The micro-dialysis probe of claim 28, wherein the profile is flat.

33. The micro-dialysis probe of claim 32, wherein the profile comprises bristles or knobs on at least one flat side to support the hollow fiber.

34. A micro-dialysis probe comprising:

a proximal probe opening providing access to a supply line and a drainage line;

a distal probe tip for introducing the probe into subcutaneous tissue;

a supply line for introducing drip-feed solution into the probe,

a drainage line;

a dialysis section being formed between the supply line and the drainage line;

the drip-feed solution flowing through the supply line in a flow direction, the flow direction

being reversed in the area of the dialysis section and between the supply line and the drainage line.

35. The micro-dialysis probe of claim 34, wherein the drainage line is formed as a hollow fiber, the hollow fiber being exposed to surrounding tissue in the area of the dialysis section.

36. The micro-dialysis probe of claim 35, further including a tube surrounding the drainage line, the tube having recesses to expose the hollow fiber to surrounding tissue in the area of the dialysis section.

37. The micro-dialysis probe of claim 36, wherein the hollow fiber is formed to be replaceable and is sealed in the tube.

38. The micro-dialysis probe of claim 34, wherein the supply line and the drainage line each extend substantially linearly.

39. The micro-dialysis probe of claim 34, wherein the supply line and the drainage line are arranged substantially side-by-side.

40. The micro-dialysis probe of claim 34, wherein the supply line and the drainage line are formed by a hollow fiber.

41. The micro-dialysis probe of claim 40, wherein the supply line and the drainage line extend substantially side-by-side.

42. The micro-dialysis probe of claim 40, wherein the supply line and the drainage line extend substantially linearly.

43. The micro-dialysis probe of claim 40, further including a supporting profile for separating the supply line and the drainage line from each other, the supporting profile including overflow openings in the area in which the flow direction is reversed.

44. The micro-dialysis probe of claim 40, wherein the profile is star-shaped.

45. The micro-dialysis probe of claim 44, wherein the profile is star-shaped as a three-armed star.

46. The micro-dialysis probe of claim 44, wherein the profile is star-shaped as a four-armed star.

47. The micro-dialysis probe of claim 40, wherein the profile is flat.

48. The micro-dialysis probe of claim 47, wherein the profile comprises bristles or knobs on at least one flat side to support the hollow fiber.