Non-overlapping spherical three-dimensional coil
View Patent ↗Vaso-occlusive devices with made of non-overlapping turns of a primary coil are described. Also described are methods of making and using these devices.
1. A vaso-occlusive device comprising at least one substantially linear strand of a vaso-occlusive member wound into a stable, three-dimensional relaxed configuration comprising a plurality of non-overlapping loops, wherein said relaxed configuration self-forms upon release from a restraining member.
2. The vaso-occlusive device of claim 1 , wherein the relaxed configuration fills a body cavity.
3. The vaso-occlusive device of claim 1 , wherein the relaxed configuration approximates a sphere.
4. The vaso-occlusive device of claim 1 , comprising between 6 and 20 loops.
5. The vaso-occlusive device of claim 1 , comprising between 6 and 12 loops.
6. The vaso-occlusive device of claim 1 , wherein the vaso-occlusive member comprises a metal selected from the group consisting of platinum, palladium, rhodium, gold, tungsten and alloys thereof.
7. The vaso-occlusive device of claim 1 , wherein the vaso-occlusive member comprises a stainless steel or super-elastic metal alloy.
8. The vaso-occlusive device of claim 1 , wherein the vaso-occlusive member comprises nitinol.
9. The vaso-occlusive device of claim 1 , further comprising additional filamentary material attached to the vaso-occlusive member.
10. The vaso-occlusive device of claim 1 , further comprising a deployment tip attached to at least one of the two ends of the vaso-occlusive member.
11. The vaso-occlusive device of claim 10 , wherein the deployment tip comprises a mechanically detachable end adapted to attach and detach from a pusher.
12. The vaso-occlusive device of claim 10 , wherein the deployment tip comprises an electrolytically detachable end adapted to detach from a pusher by imposition of a current on the pusher.
13. A method of occluding a body cavity comprising introducing a vaso-occlusive device according to claim 1 into the body cavity.
14. The method of claim 13 , wherein the body cavity is an aneurysm.
15. A method of making a non-overlapping three-dimensional vaso-occlusive device according to claim 1 , the method comprising
(a) winding a substantially linear strand of a vaso-occlusive member around a winding mandrel, said winding comprising a winding pattern that produces a non-overlapping three-dimensional vaso-occlusive device according to claim 1 ; and
(b) heating the mandrel and vaso-occlusive member to produce said vaso-occlusive device.
16. The method of claim 15 , wherein the winding pattern is a Figure 8 or hourglass.
17. The method of claim 15 , wherein the winding mandrel comprises a sphere having grooves adapted to fit the substantially linear strand.
18. The method of claim 15 , wherein the winding mandrel comprises a cylinder.
19. The method of claim 15 , wherein the winding mandrel comprises a sphere having a plurality of pins on the surface thereof.
20. The method of claim 15 , wherein the winding mandrel comprises a tetrahedron.
21. The method of claim 15 , wherein the winding mandrel comprises 3 intersecting posts which form a 6 post structure and wherein each post is at approximately 90 relative to the adjacent posts.
22. The method of claim 21 , wherein at least one post has a round cross section.
23. The method of claim 21 , wherein each post has a round cross section.