Deploying Embolic Coils

• US 20080221554A1
• Filed: 02/12/2008
• Published: 09/11/2008
• Est. Priority Date: 03/05/2007
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Elliott, Christopher J., Buiser, Marcia S., McCarthy, Mary, O'Connor, Aidan, Burgos, Ines
• Granted Patent: US 10,524,799 B2
• Time in Patent Office: Days
• US Class Current: 604/526
• CPC Class Codes: A61B 17/12022 Occluding by internal devices, e.g. balloons or releasable wires plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20
• CPC Class Codes: A61B 17/12113 within an aneurysm
• CPC Class Codes: A61B 17/12145 having a pre-set deployed three-dimensional shape methods of manufacturing A61B2017/00526
• CPC Class Codes: A61B 17/1215 comprising additional materials, e.g. thrombogenic, having filaments, having fibers, being coated
• CPC Class Codes: A61B 2017/12054 Details concerning the detachment of the occluding device from the introduction device

Abstract

An embolic coil delivery system includes a catheter and an embolic coil disposed within the catheter, the embolic coil including a coil wire and a fiber bundle. A method of producing an embolic coil delivery system includes: advancing a delivery sheath over a distal end of an embolic coil while applying tension to the embolic coil via a retaining device that is attached to the distal end of the embolic coil.

Claims

1. A system comprising:

a catheter having a delivery end; and

an embolic coil at least partially disposed within the catheter, the embolic coil including

a coil wire having an end fitting configured to releasably couple to an end fitting of a delivery wire, and

a fiber bundle contacting the catheter, the fiber bundle having a first bundle end being attached to the coil wire and a second bundle end opposite the first bundle end;

wherein the fiber bundle is disposed such that a distance from the first bundle end to the delivery end of the catheter is less than a distance from the second bundle end to the delivery end of the catheter.

2. The system of claim 1, wherein the embolic coil comprises multiple fiber bundles contacting the catheter, each fiber bundle having first and second bundle ends, the first bundle end being attached to the coil wire, the second bundle end opposite the first bundle end, the fiber bundle being disposed such that a distance from the first bundle end of a specific fiber bundle to the delivery end of the catheter is less than a distance from the second bundle end of the specific fiber bundle to the delivery end of the catheter.

3. The system of claim 2, wherein more fiber bundles are attached to a first half of the coil than are attached to a second half of the coil.

4. The system of claim 3, wherein the coil is disposed in the catheter such that the second half of the coil is between the first half of the coil and the delivery end of the catheter.

5. The system of claim 3, wherein spacing between adjacent fiber bundles increases with increasing distance from the end fitting of the coil wire.

6. The system of claim 3, wherein the fiber bundles are disposed in at least one group and the spacing between adjacent fiber bundles is constant within each group of the at least one group.

7. The system of claim 2, wherein each fiber bundle is attached to the coil wire at an attachment point and a first attachment point is circumferentially spaced apart from a second attachment point.

8. The system of claim 7, wherein the attachment point of each fiber bundle is circumferentially spaced apart from the attachment points of adjacent fiber bundles.

9. The system of claim 1, wherein the fiber bundle comprises polyethylene terephthalate or nylon.

10. The system of claim 1, wherein the coil wire has a diameter from 0.0075 inch to 0.015 inch.

11. The system of claim 1, wherein the fiber bundle has a length from 0.025 inch to 0.125 inch.

12. The system of claim 1, wherein the coil wire comprises a metal.

13. The system of claim 1, further comprising a lubricant disposed within the catheter.

14. The system of claim 13, wherein the lubricant is disposed on the fiber bundle.

15. The system of claim 1, wherein an inner surface of the catheter comprises a material selected from the group consisting of polypropylene, polytetrafluoroethylene (PTFE), fluoroethylene polymer (FEP), low-density polyethylene (LDPE), high-density polyethylene (HDPE), nylon, Teflon®

, and acrylic.

16. A coil comprising:

a coil wire having a first end, and opposite second end, and a midpoint located halfway between the first end and the second end; and

multiple fiber bundles attached to the coil wire;

wherein more fiber bundles are attached to the coil wire between the first end and the midpoint than are attached to the coil wire between the second end and the midpoint, and

wherein the coil is an embolic coil.

17. The coil of claim 16, wherein spacing between adjacent fiber bundles increases with increasing distance from the first end of the coil.

18. The coil of claim 16, wherein the fiber bundles are disposed in at least one group and the spacing between adjacent fiber bundles is constant within each group of the at least one group.

19. The coil of claim 16, further comprising a end fitting attached to the first end of the coil wire, the end fitting configured to releasably couple the embolic coil to a mating end fitting of a delivery wire.

20. The coil of claim 16, wherein a proximal end of the coil wire is configured to provide an opposable surface configured for engagement of a pusher element.

21. A system comprising:

a catheter having a delivery end;

a delivery wire with an end fitting; and

an embolic coil disposed within the catheter, the embolic coil having a first half and a second half, the second half disposed between the first half and the delivery end of the catheter, the embolic coil including a coil wire and multiple fiber bundles contacting the catheter, the coil wire having an end fitting configured to releasably couple to the end fitting of the delivery wire and each fiber bundle extending from a first bundle end attached to the coil wire to a second bundle end opposite the first bundle end;

wherein a majority of the fiber bundles are angled such that a distance from the first bundle end of a specific fiber bundle to the delivery end of the catheter is less than a distance from the second bundle end of the specific fiber bundle to the delivery end of the catheter; and

wherein more fiber bundles are attached to the first half of the embolic coil than are attached to a second half of the coil.

22. The system of claim 21, wherein spacing between adjacent fiber bundles increases with increasing distance from the end fitting of the coil wire.

23. The system of claim 21, wherein the fiber bundles are disposed in groups and the spacing between adjacent fiber bundles is constant within each group.

24. The system of claim 21, wherein each fiber bundle is attached to the coil wire at an attachment point and a first attachment point is circumferentially spaced apart from a second attachment point.

25. The system of claim 24, wherein the attachment point of each fiber bundle is circumferentially spaced apart from the attachment points of adjacent fiber bundles.

26. A method comprising:

advancing a delivery sheath over a distal end of an embolic coil while applying tension to the embolic coil via a retaining device that is attached to the distal end of the embolic coil.

27. The method of claim 26, further comprising engaging fiber bundles extending from a first bundle end attached to the coil wire to a second bundle end with the sheath such that, for a majority of the fiber bundles, a distance from the first bundle end of a specific fiber bundle to a proximal end fitting of the embolic coil is greater than a distance from the second bundle end of the specific fiber bundle to the end fitting of the embolic coil.

28. The method of claim 27, further comprising stopping advancement of the sheath after the distal end of the coil emerges from a delivery end of the sheath and before any of the fiber bundles emerge from the delivery end of the sheath.

29. The method of claim 28, further comprising detaching the retaining device from the distal end of the coil.

30. The method of claim 29, further comprising refining the distal end of the coil.

31. The method of claim 30, further comprising withdrawing the distal end of the coil into the sheath.

32. The method of claim 26, further comprising stopping advancement of the catheter over the embolic coil before a proximal end of the coil enters the sheath.

33. The method of claim 32, further comprising engaging an end fitting of a delivery wire with a proximal end fitting of the coil.