Fast-detaching electrically insulated implant

• US 6,156,061 A
• Filed: 08/29/1997
• Issued: 12/05/2000
• Est. Priority Date: 08/29/1997
• Status: Expired due to Term

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Target Therapeutics, Inc. (Boston Scientific Corporation)
• Inventors: Bashiri, Mehran, Wallace, Michael P., Roue, Chad C.
• Primary Examiner(s): Milano, Michael J.
• Application Number:
  US08/920,526
• Time in Patent Office: 1,194 Days
• Field of Search: 623/1, 623/11, 623/12, 623/1.11, 623/1.1, 606/195, 606/198, 606/200
• US Class Current: 623/1.11
• 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 17/12154 having stretch limiting means
• CPC Class Codes: A61B 2017/12063 electrolytically detachable
• CPC Class Codes: A61F 2/01 Filters implantable into blood vessels
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts

Abstract

This is an implant for placement in the human body and an assembly for so placing that implant. Most desirably, it is an implant for use in the vasculature of the human body and is used to occlude some space in that vasculature as a portion of a treatment regimen. The implant itself is preferably a component of a deployment device using an electrolytically severable joint. The implant component is at least partially covered with a highly resistive or insulative covering. The highly resistive or insulative layer or covering appears to enhance the susceptibility of the electrolytic joint to quick erosion and thus detachment of the implant. Although the implant itself is preferably a vaso-occlusive device, it may instead be a stent, a vena cava filter, or other implant which may be installed in this manner. The implant may be independently coated with insulative or resistive material or may be formed using a material with such as tantalum, which forms such an insulator or resistor in situ.

Claims

1. An implant for placement in the human body comprising an implant member of a size and configuration suitable for implantation in the human body and having a proximal end and a distal end and having an implant member core at least partially covered with an inorganic insulative covering.

2. The implant of claim 1 further comprising an electrolytically severable joint attached to said implant member proximal end, said electrolytically severable joint being relatively more susceptible to electrolysis in an ionic solution than is said implant member.

3. The implant of claim 1 wherein said implant member at least partially comprises an oxide-forming material.

4. The implant of claim 2 wherein said implant member at least partially comprises an oxide forming material.

5. The implant of claim 1 wherein said implant member comprises an implant member core at least partially covered by a oxide-forming member.

6. The implant of claim 2 wherein said implant member comprises an implant member core at least partially covered by an oxide-forming material.

7. The implant of claim 1 wherein the implant member is a stent.

8. The implant of claim 1 wherein the implant member comprises a vena cava filter.

9. The implant of claim 1 wherein the implant member comprises a helically wound coil having a proximal end and a distal end.

10. The implant of claim 9 wherein the helically wound coil implant member further comprises a stretch resistant member extending at least partially from said proximal end to said distal end.

11. The implant of claim 10 wherein the stretch resistant member comprises polypropylene.

12. The implant member of claim 1 wherein the implant member comprises a braid.

13. A vaso-occlusive device for occluding a space within a human body comprising a tantalum occluding member at least partially covered with tantalum oxide.

14. The vaso-occlusive device of claim 13 wherein said tantalum occluding member has a proximal end and a distal end and further comprising an electrolytically severable joint attached to said tantalum occluding member proximal end, said electrolytically severable joint being relatively more susceptible to electrolysis in an ionic solution than is said tantalum occluding member.

15. The vaso-occlusive device of claim 13 wherein the tantalum occluding member is a coil.

16. The vaso-occlusive device of claim 14 wherein the tantalum occluding member is a coil.

17. The vaso-occlusive device of claim 13 wherein the tantalum occluding member is a braid.

18. The vaso-occlusive device of claim 14 wherein the tantalum occluding member is a braid.

19. The vaso-occlusive device of claim 15 herein the helically wound coil implant member has a proximal end and a distal end and further comprises a stretch resistant member extending at least partially from said proximal end to said distal end.

20. The vaso-occlusive device of claim 19 wherein the stretch resistant member comprises polypropylene.

21. The vaso-occlusive device of claim 16 herein the helically wound coil implant member has a proximal end and a distal end and further comprises a stretch resistant member extending at least partially from said proximal end to said distal end.

22. The vaso-occlusive device of claim 21 wherein the stretch resistant member comprises polypropylene.

23. A vaso-occlusive device for occluding a space within the human body comprising:

(a.) a tantalum occluding member having a proximal end and a distal end, and

(b.) an electrolytically severable joint attached to said tantalum occluding member proximal end, said electrolytically severable joint being relatively more susceptible to electrolysis in an ionic solution than is said tantalum occluding member.

24. The vaso-occlusive device of claim 23 wherein the tantalum occluding member is a helically wound coil.

25. The vaso-occlusive device of claim 23 wherein the tantalum occluding member is a braid.