Delivery and detachment systems and methods for vascular implants

Patent metadata

Field	Value
Publication number	US-10123802-B2
Application number	US-201514973185-A
Country	US
Kind code	B2
Filing date	Dec 17, 2015
Priority date	Nov 16, 2012
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A system for delivering an implant device to a vascular site in a patient a delivery pusher apparatus, an implant device detachably connected to the delivery pusher apparatus by a tether having a distal end connected to a proximal end of the implant device, wherein the tether is substantially non-tensioned when connecting the implant device to the delivery pusher, and an electrical heating element configured coaxially around at least a portion of the tether, wherein heat generated by the heating element severs the tether at a point near the proximal end of the implant device.

First claim

The invention claimed is:

1. An implant delivery system comprising:
an elongate delivery device having a proximal end and a distal end;
an implant device having a proximal end and a distal end and detachably connected to the delivery device by a tether, the proximal end of the implant adjacent the distal end of the elongate delivery device, wherein the tether is substantially non-tensioned;
an electric heater arranged coaxially around at least a portion of the tether, the electric heater comprising a distal winding portion contained substantially at the distal end of the elongate delivery device and providing a focused heating zone;
wherein the electric heater is operable to achieve a temperature in the distal winding portion that is sufficient to sever the tether; and,
wherein the distal winding portion is doubled back or reversed upon itself.

2. The implant delivery system of claim 1 , wherein the tether comprises a distal end coupled to the proximal end of the implant device.

3. The implant delivery system of claim 1 , wherein the distal winding portion has a pitch that is between about 0.018 mm and about 0.38 mm.

4. The implant delivery system of claim 1 , wherein the distal winding portion has between 2 and 10 coil windings.

5. The implant delivery system of claim 4 , wherein the distal winding portion has between 2 and 5 coil windings.

6. The implant delivery system of claim 1 , wherein the distal winding portion has a length that is between 0.1 mm and 0.5 mm.

7. The implant delivery system of claim 1 , wherein the tether comprises a polymeric material.

8. The implant delivery system of claim 1 , wherein the tether comprises a monofilament.

9. The implant delivery system of claim 1 , wherein the tether has a diameter or thickness of between about 0.05 mm and 0.2 mm.

10. The implant delivery system of claim 1 , wherein the tether is configured to withstand a tensile load of between 0.5 kg and 5 kg.

11. The implant delivery system of claim 1 , wherein the tether comprises polyester.

12. The implant delivery system of claim 1 , wherein the implant device includes a braided vascular occlusion device.

13. The implant delivery system of claim 1 , wherein the electric heater has a first resistance and is connectable to a power source by a pair of lead wires having a second resistance, and wherein the ratio of the first resistance to the second resistance is between 0.6 and 1.6.

14. The implant delivery system of claim 1 , wherein the tether has a distal portion and a proximal portion, and wherein the electric heater is disposed coaxially around the distal portion of the tether.

15. The implant delivery system of claim 14 , wherein the distal portion of the tether is connected to a proximal end of the implant device.

16. The implant delivery system of claim 1 , wherein the electric heater comprises a wire formed of a platinum-tungsten alloy.

17. The implant delivery system of claim 1 , further comprising an insulating tubing extending over the electric heater.

18. The implant delivery system of claim 17 , wherein a chamber is defined between the electric heater and the tether, the chamber being configured to resist the entrance of fluid.

19. The implant delivery system of claim 1 , wherein the electric heater comprises wire having a coating.

20. The implant delivery system of claim 19 , wherein the coating comprises an insulative material.

21. The implant delivery system of claim 20 , wherein the insulative material comprises polyimide.

22. The implant delivery system of claim 1 , wherein the electric heater further comprises a first open-pitch winding portion and a second open pitch winding portion, each extending proximally from the distal winding portion.

23. An implant delivery system comprising:
an elongate delivery device having a proximal end and a distal end;
an implant device having a proximal end and a distal end and detachably connected to the delivery device by a tether, the proximal end of the implant adjacent the distal end of the elongate delivery device, wherein the tether is substantially non-tensioned;
an electric heater arranged coaxially around at least a portion of the tether, the electric heater comprising a distal winding portion contained substantially at the distal end of the elongate delivery device and providing a focused heating zone;
wherein the electric heater is operable to achieve a temperature in the distal winding portion that is sufficient to sever the tether; and,
wherein the electric heater further comprises a first open-pitch winding portion and a second open pitch winding portion, each extending proximally from the distal winding portion.

24. The implant delivery system of claim 23 , wherein the tether comprises a distal end coupled to the proximal end of the implant device.

25. The implant delivery system of claim 23 , wherein the distal winding portion has a pitch that is between about 0.018 mm and about 0.38 mm.

26. The implant delivery system of claim 23 , wherein the distal winding portion has between 2 and 10 coil windings.

27. The implant delivery system of claim 26 , wherein the distal winding portion has between 2 and 5 coil windings.

28. The implant delivery system of claim 23 , wherein the distal winding portion has a length that is between 0.1 mm and 0.5 mm.

29. The implant delivery system of claim 23 , wherein the tether comprises a polymeric material.

30. The implant delivery system of claim 23 , wherein the tether comprises a monofilament.

31. The implant delivery system of claim 23 , wherein the tether has a diameter or thickness of between about 0.05 mm and 0.2 mm.

32. The implant delivery system of claim 23 , wherein the tether is configured to withstand a tensile load of between 0.5 kg and 5 kg.

33. The implant delivery system of claim 23 , wherein the tether comprises polyester.

34. The implant delivery system of claim 23 , wherein the implant device includes a braided vascular occlusion device.

35. The implant delivery system of claim 23 , wherein the electric heater has a first resistance and is connectable to a power source by a pair of lead wires having a second resistance, and wherein the ratio of the first resistance to the second resistance is between 0.6 and 1.6.

36. The implant delivery system of claim 23 , wherein the tether has a distal portion and a proximal portion, and wherein the electric heater is disposed coaxially around the distal portion of the tether.

37. The implant delivery system of claim 36 , wherein the distal portion of the tether is connected to a proximal end of the implant device.

38. The implant delivery system of claim 23 , wherein the electric heater comprises a wire formed of a platinum-tungsten alloy.

39. The implant delivery system of claim 23 , further comprising an insulating tubing extending over the electric heater.

40. The implant delivery system of claim 39 , wherein a chamber is defined between the electric heater and the tether, the chamber being configured to resist the entrance of fluid.

41. The implant delivery system of claim 23 , wherein the electric heater comprises wire having a coati

Assignees

• Sequent Medical Inc

Inventors

• Plaza Claudio
• Hemmelgarn Scott
• Charlton Eileen
• Hewitt Todd
• Marchand Philippe
• Welsh Daniel
• Patterson William R
• Pham Son

Classifications

• A61B17/12172 Primary

  having a pre-set deployed three-dimensional shape (methods of manufacturing A61B2017/00526) · CPC title

• A61B17/12109 Primary

  in a blood vessel · CPC title

• A61B17/12113

  within an aneurysm · CPC title

• A61B2017/12068

  detachable by heat · CPC title

• A61B2017/12077

  Joint changing shape upon application of heat, e.g. bi-metal or reversible thermal memory · CPC title