Declotting method and apparatus

• US 6,146,396 A
• Filed: 03/05/1999
• Issued: 11/14/2000
• Est. Priority Date: 03/05/1999
• Status: Expired due to Term

• Current Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Original Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Inventors: Wright, Kenneth C., Konya, Andras
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): LEWIS, WILLIAM W
• Application Number:
  US09/262,994
• Time in Patent Office: 620 Days
• Field of Search: 606/1, 606/108, 606/198, 606/200, 606/159, 604/104, 604/105
• US Class Current: 606/159
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop

Abstract

A declotting method and apparatus. A declotting apparatus includes a catheter, a member positioned within the catheter, and a plurality of deformable members. The plurality of members bow and compress as the catheter slides relative to the member so that a site may be declotted. In another embodiment, a declotting apparatus includes a first and second catheter, a guidewire, a deformable jacket, and a liner. The deformable jacket expands and contracts as the first catheter slides relative to the second catheter so that a site may be declotted. The guidewire facilitates navigation, and the liner prevents material from entering the apparatus.

Claims

1. A declotting apparatus comprising:

a catheter;

a member positioned within said catheter, said member slidable relative to said catheter;

a plurality of deformable members forming at least one loop, said members having a proximal portion and a distal portion, said proximal portion being coupled to said catheter at a proximal site and said distal portion being coupled to said member at a distal site;

wherein said proximal site and said distal site are separated by a distance;

wherein said plurality of deformable members are configured to bow as said catheter slides to reduce said distance; and

wherein said plurality of deformable members are configured to compress as said catheter slides to increase said distance.

2. The apparatus of claim 1, wherein said plurality of deformable members form at least two loops.

3. The apparatus of claim 1, wherein said plurality of deformable members are programmed with thermal memory.

4. The apparatus of claim 1, wherein said plurality of deformable members are programmed with superelasticity.

5. The apparatus of claim 1, wherein said plurality of deformable members comprise nitinol wire.

6. The apparatus of claim 1, wherein said plurality of deformable members are elastically deformable.

7. The apparatus of claim 1, further comprising a deformable jacket in operable relation to said plurality of deformable members and configured to cover at least a portion of said plurality of deformable members.

8. The apparatus of claim 7, wherein said deformable jacket is configured to expand as said plurality of deformable members bow and wherein said deformable jacket is configured to contract as said plurality of deformable members compress.

9. The apparatus of claim 7, wherein said deformable jacket comprises braided stainless steel mesh.

10. The apparatus of claim 7, further comprising a liner coupled to an inner surface of said deformable jacket and configured to prevent material from entering an interior of said apparatus.

11. The apparatus of claim 1, further comprising a pair of clips coupled to said plurality of deformable members.

12. The apparatus of claim 1, further comprising a sliding agent in operative relation to said catheter and said member and operable to slide said catheter relative to said member.

13. The apparatus of claim 12, wherein said sliding agent comprises:

a hand grip;

a one-arm lever coupled to said hand grip and to said catheter;

a luer adaptor coupled to said member; and

a spring coupled to said hand grip and to said one-arm lever, said spring extending therebetween.

14. The apparatus of claim 12, wherein said sliding agent comprises:

a grip body;

a luer adaptor coupled to said grip body;

a spring coupled to said grip body and configured to pull said catheter to compress said deformable members;

a thumb button coupled to said spring and said catheter and configured to control the extent of compression of said deformable members; and

a ratchet mechanism in operative relation to said thumb button and configured to engage said thumb button to lock a position of said deformable members.

15. The apparatus of claim 1, further comprising a lock in operative relation to said catheter and said member and configured to fix the distance between said proximal site and said distal site.

16. The apparatus of claim 1, further comprising an injection port and one or more injectors coupled to said catheter.

17. The apparatus of claim 1, wherein said member comprises a catheter.

18. The apparatus of claim 17, further comprising a guidewire positioned within said catheter and extending through said distal site.

19. The apparatus of claim 18, wherein said guidewire is angled.

20. The apparatus of claim 1, wherein said member comprises a nitinol microtubing.

21. The apparatus of claim 1, wherein said member comprises a nitinol wire.

22. A declotting apparatus comprising:

a first catheter defining a first lumen;

a second catheter defining a second lumen, said second catheter positioned within said first lumen, said second catheter slidable relative to said first catheter;

a deformable jacket having a proximal end and distal end, said proximal end being coupled to said first catheter at a proximal site and said distal end being coupled to said second catheter at a distal site;

a guidewire positioned within said second catheter and extending through said distal site;

a liner coupled to an inner surface of said deformable jacket and configured to prevent material from entering an interior of said apparatus;

wherein said proximal site and said distal site are separated by a distance;

wherein said deformable jacket is configured to expand as said first catheter slides to reduce said distance; and

wherein said deformable jacket is configured to contract as said first catheter slides to increase said distance.

23. The apparatus of claim 22, further comprising a plurality of deformable members coupled between said proximal site and said distal site.

24. The apparatus of claim 23, wherein said plurality of deformable members form at lease one loop.

25. The apparatus of claim 23, wherein said plurality of deformable members are programmed with thermal memory.

26. The apparatus of claim 23, wherein said plurality of deformable members are programmed with superelasticity.

27. The apparatus of claim 23, wherein said plurality of deformable members comprise nitinol wire.

28. The apparatus of claim 23, further comprising a pair of clips coupled to said plurality of deformable members.

29. The apparatus of claim 22, wherein said deformable jacket comprises braided stainless steel mesh.

30. The apparatus of claim 22, further comprising a lock in operative relation to said first and second catheters and configured to fix the distance between said proximal site and said distal site.

31. The apparatus of claim 22, further comprising a sliding agent in operative relation to said first and second catheters and operable to slide said first catheter relative to said second catheter.

32. The apparatus of claim 22, further comprising an injection port and one or more injectors coupled to said first catheter.

33. The apparatus of claim 22, wherein said second catheter comprises a nitinol microtubing.

34. A method for declotting a site, comprising:

providing a declotter including;

a catheter;

a member positioned within said catheter;

a plurality of deformable members forming at least one loop, said members having a proximal portion and a distal portion, said proximal portion being coupled to said catheter at a proximal site and said distal portion being coupled to said member at a distal site;

said proximal site and said distal site being separated by a distance; and

a deformable jacket in operable relation to said plurality of deformable members;

compressing said plurality of deformable members by sliding said catheter relative to said member to increase said distance and to contract said deformable jacket;

positioning said declotter adjacent said site; and

bowing said plurality of deformable members by sliding said catheter relative to said member to decrease said distance and to expand said deformable jacket to declot said site.

35. The method of claim 34, further comprising locking said deformable jacket in a contracted state.

36. The method of claim 34, further comprising continuously modifying a diameter of said deformable jacket by sliding said catheter relative to said member.

37. The method of claim 34, wherein said declotter further comprises an injection port and one or more injectors coupled to said catheter, and wherein said method further comprises injecting contrast through said declotter with said injection port.

38. The method of claim 34, wherein said site is an thrombosed hemodialysis access graft site.

39. The method of claim 34, wherein said site is a thrombosed intragraft site.

40. The method of claim 34, wherein said site is a venous stenosis site.

41. A method for declotting a site, comprising:

providing a declotter including;

a first catheter defining a first lumen;

a second catheter defining a second lumen, said second catheter positioned within said first lumen;

a guidewire positioned within said second catheter;

a deformable jacket having a proximal end and distal end, said proximal end being coupled to said first catheter at a proximal site and said distal end being coupled to said second catheter at a distal site;

wherein said proximal site and said distal site are separated by a distance; and

a liner coupled to an inner surface of said deformable jacket;

contracting said deformable jacket by sliding said first catheter relative to said second catheter to increase said distance;

maneuvering said declotter with said guidewire;

positioning said declotter adjacent said site; and

expanding said deformable jacket by sliding said first catheter relative to said second catheter to decrease said distance to declot said site.

42. The method of claim 41, further comprising preventing material from entering an interior of said declotter with said liner.

43. The method of claim 41, further comprising continuously modifying a diameter of said deformable jacket by sliding said first catheter relative to said second catheter.

44. The method of claim 41, wherein said site is an thrombosed hemodialysis access graft site.

45. The method of claim 41, wherein said site is a thrombosed intragraft site.

46. The method of claim 41, wherein said site is a venous stenosis site.