Device for the Removal of Thrombi

• US 20090306702A1
• Filed: 11/09/2006
• Published: 12/10/2009
• Est. Priority Date: 08/23/2004
• Status: Abandoned Application

• Current Assignee: Phenox Gmbh
• Original Assignee: Phenox Gmbh
• Inventors: Pracht, Holgar, Dieste, Fabian, Hannes, Ralf, Monstadt, Hermann, Miloslavski, Elina
• Application Number:
  US12/084,596
• Publication Number:
  US 20090306702A1
• Time in Patent Office: Days
• US Class Current: 606/200
• 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 2010/0216 Sampling brushes
• CPC Class Codes: A61B 2017/22001 Angioplasty, e.g. PCTA
• CPC Class Codes: A61B 2017/22034 for gripping the obstruction or the tissue part from inside
• CPC Class Codes: A61B 2017/22038 with a guide wire
• CPC Class Codes: A61B 2017/22042 Details of the tip of the guide wire
• CPC Class Codes: A61B 2017/22079 with suction of debris
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61B 2090/397 electromagnetic other than visible, e.g. microwave

Abstract

The invention relates to a device provided with one or several distal elements (27), with the distal element (27) comprising at least two core wires (14) which are twisted around each other and between which fibers (6) are arranged transversely to the extension of the core wires (14), with said fibers (6) being twisted together with the core wires (14) so that the fibers (6) project radially outward from the distal element (27).

Claims

1. Device for the removal of foreign objects and thrombi from body cavities and blood vessels comprising a guide wire (18) provided with one or several distal elements (27), characterized in that the distal element (27) consists of at least two core wires (14) which are twisted around each other and between which fibers (6) are arranged transversely to the extension of the core wires (14), with said fibers (6) being twisted together with the core wires (14) so that the fibers (6) project radially outward from the distal element (27).

2. Device according to claim 1, characterized in that the core wires (14) are connected with each other at the distal end in such a way that they form a loop (16).

3. Device according to claims 1 or 2, characterized in that the core wires (14) are connected at their proximal end via a coil (17) with other, proximally arranged components of the device.

4. Device according any one of claims 1 to 3, characterized in that the core wires (14) are made of platinum or a platinum alloy, platinum-iridium, a nickel-titanium alloy, tungsten, a tungsten alloy, stainless steel or a combination thereof.

5. Device according to any one of the claims 1 to 4, characterized in that the twisted core wires (14) extend in a straight line.

6. Device according to any one of the claims 1 to 4, characterized in that the twisted core wires (14) form a secondary structure.

7. Device according to claim 6, characterized in that an elongation preventing filament extends through the inner space of the secondary structure or external to the secondary structure.

8. Device according to claim 7, characterized in that the elongation preventing filament is designed in the form of a straight, wave-like or helical wire.

9. Device according to claim 7, characterized in that the elongation preventing filament consists of a polymer material.

10. Device according to any one of the claims 6 to 9, characterized in that the twisted core wires (14) have a wave-like configuration.

11. Device according to any one of the claims 6 to 9, characterized in that the twisted core wires (14) are designed in the form of a helix.

12. Device according to claim 11, characterized in that the diameter of the helix increases from distal to proximal or from proximal to distal.

13. Device according to any one of the claims 1 to 12, characterized by several distal elements (27) from which fibers (6) protrude radially outward.

14. Device according to claim 13, characterized in that the distal elements (27) are connected with each other by articulated joints (20).

15. Device according to claim 13, characterized in that the distal elements (27) are arranged side by side viewed in a cross-sectional representation.

16. Device according to claim 15, characterized in that the distal elements (27) are twisted around each other to form a helix.

17. Device according to any one of the claims 1 to 16, characterized in that the distal elements (27) are provided with braces (21) starting out from the distal end of the distal element (27), extend radially outward and again converge centrally at the proximal end of the distal element (27).

18. Device according to claim 17, characterized in that the braces (21) span over several distal elements (27).

19. Device according to claim 17 or 18, characterized in that additional intermediate braces (22) are arranged between braces (21) and the centrally extending core wires (14) of the distal element (27).

20. Device according to any one of the claims 1 to 19, characterized in that the radial extension of the fibers (6) of the distal element (27) increases from proximal to distal.

21. Device according to any one of the claims 1 to 20, characterized in that the fibers (6) in the proximal area of the distal element (27) are harder than in the distal area of the distal element (27).

22. Device according to any one of the claims 1 to 20, characterized in that the fibers (6) in the middle area of the distal element (27) are softer than in the proximal and distal area of the distal element (27).

23. Device according to any one of the claims 1 to 22, characterized in that the density of the fiber coverage in the middle area of the distal element (27) is lower than in the proximal and distal area of the distal element (27).

24. Device according to any one of the claims 1 to 23, characterized in that the fibers (6) are secured or attached to the core wires (14) by clamping, bonding, knotting and/or fusing.

25. Device according to any one of the claims 1 to 24, characterized in that the ends of the fibers (6) located radially outward are provided with slubs or nubs.

26. Device according to any one of the claims 1 to 25, characterized in that the ends of the fibers (6) located radially outward are at least in part connected with each other by means of loops.

27. Device according to any one of the claims 1 to 26, characterized in that the fibers (6), at least partially, protrude differently far radially outward at both sides of the distal element (27).

28. Device according to any one of the claims 1 to 27, characterized in that the core wires (14) in the cross sectional area of the distal element (27) are arranged and extend eccentrically.

29. Device according to any one of the claims 1 to 28, characterized in that the brush structure formed by one or several distal elements is suitable to be flatly collapsible under the external strain exerted by a micro-catheter and transported inside the micro-catheter and unfolds to its full brush structure when said external strain caused by the micro-catheter is omitted.

30. Device according to any one of the claims 1 to 29, characterized in that the distal elements (27) are designed so as to be detachable from the guide wire (18).

31. Device according to any one of the claims 1 to 30, characterized in that the device additionally is provided with an elongated cage structure which is suitable to be flatly collapsible under the external strain exerted by a micro-catheter and transported inside the micro-catheter and unfolds to its full cage structure when said external strain caused by the micro-catheter is omitted.

32. Device according to any one of the claims 1 to 31, characterized in that the fibers (6) form an angle with longitudinal axis of the device that ranges between 70°

and 110°

, preferably between 80° and

90°

.

33. Device according to any one of the claims 1 to 32, characterized in that the fibers (6) have been provided with a coating.

34. Device according to any one of the claims 1 to 31, characterized by one or several radiopaque markers (9).

35. Device according to any one of the claims 1 to 34 in combination with a guide catheter and/or micro-catheter.

36. Device according to claim 35, characterized in that the guide or micro-catheter is designed as aspiration catheter.

37. Method for the manufacture of a distal element (27) forming part of a device according to claim 1, characterized in that at least two core wires (14) are arranged parallel to each other, between which fibers (6) are arranged transversely to the extension of the core wires (14), with said core wires (14) being twisted around each other.

38. Device for the removal of foreign objects and thrombi from body cavities and blood vessels comprising a guide wire (18) provided with one or several distal elements (27), with the distal element (27) being provided with fibers (6) projecting radially outward, characterized in that the distal element (27) has a tapered shape.

39. Device according to claim 38, characterized in that the diameter of the distal element (27) increases from proximal to distal.

40. Device according to claim 38, characterized in that the diameter of the distal element (27) increases from distal to proximal.