Stretch resistant vaso-occlusive coils

• US 6,004,338 A
• Filed: 08/11/1998
• Issued: 12/21/1999
• Est. Priority Date: 06/30/1995
• Status: Expired due to Term

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Target Therapeutics, Inc. (Boston Scientific Corporation)
• Inventors: Engelson, Erik T., Ken, Christopher G. M., Gia, Son M.
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): TRUONG, KEVIN THAO
• Application Number:
  US09/132,117
• Time in Patent Office: 497 Days
• Field of Search: 606/191, 606/108, 606/198, 606/194, 606/195, 606/200, 623/1, 623/12
• US Class Current: 606/191
• 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 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2017/12063 electrolytically detachable
• CPC Class Codes: A61B 2090/3937 Visible markers
• CPC Class Codes: A61F 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2210/0019 operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation

Abstract

This is an implantable vaso-occlusive device. It is typically a vaso-occlusive coil comprised of a primary helically wound coil which may then be wound into a secondary shape. Central to the invention is the use of a stretch-resisting member fixedly attached within at least a portion of the primary coil. The stretch-resisting member may be formed into coil tips at the ends of the coil by melting the polymeric fibers or alloys or by attaching the fibers with a glue. This stretch-resisting member is for the primary purpose of preventing stretching of the coil during movement of that coil, e.g., by retrieval or repositioning after deployment. The device typically has a self-forming secondary shape made from a pre-formed primary linear helically wound coil, although it need not have the secondary form. External fibers may be attached to the device and affixed to the pre-formed linear member to increase . The vaso-occlusive member may be also be covered with a fibrous braid. The device is typically introduced into the body through a catheter. The device is passed axially through the catheter sheath and assumes its secondary form upon exiting the catheter.

Claims

1. A vaso-occlusive device comprising:

i. an outer helically wound primary coil having a first end and a second end, an axis between said first and second ends, and having a lumen between said first end and second end, and

ii. a stretch-resisting member extending through at least a portion of said lumen and fixedly attached to said primary coil in at least two axially separated locations.

2. A vaso-occlusive device comprising:

i. an outer helically wound primary coil having a first end and a second end, an axis between said first and second ends, and having a lumen between said first end and second end,

ii. a polymeric stretch-resisting member extending through at least a portion of said lumen and fixedly attached to said primary coil in at least two axially separated locations; and

iii. a deployment tip attached to at least one of said first end or said second end, said deployment tip comprising an electrolytically detachable end adapted to detach from a pusher by imposition of a current upon said pusher, and wherein the polymeric stretch-resisting member allows for repositioning of the vaso-occlusive device after deployment.

3. The device of claim 2 where the device has a secondary form.

4. The device of claim 3 wherein said secondary form is C-shaped, clover-leaf shaped or double-looped shape.

5. The device of claim 2 additionally comprising external filamentary material attached to said primary coil.

6. The device of claim 5 wherein the external filamentary material comprises a looped fibrous elements or a fibrous woven or braided tubular member.

7. The device of claim 2 wherein the stretch-resisting member comprises a ribbon.

8. The device of claim 7 wherein said secondary form is C-shaped, clover-leaf shaped or double-looped shape.