Embolic coils
Coils, such as embolic coils, and related methods, devices, and compositions, are disclosed.
1. An embolic coil formed of a wound ribbon having a primary shape and a secondary shape, wherein:
the primary shape is a straight shape;
the secondary shape is selected from the group consisting of a spiral shape, a single apex vortex shape, a J shape, a helical shape, a complex helical shape and a straight shape;
the wound ribbon is configured to exhibit its primary shape when disposed in a lumen of a medical device;
the wound ribbon is configured to exhibit its secondary shape upon exit from the medical device;
in its primary shape, the wound ribbon comprises consecutive windings of the ribbon that contact each other and are flush with each other; and
the ribbon is a strip of material having a polygonal transverse cross-section.
2. The embolic coil of claim 1 , wherein the wound ribbon includes a first end that is not attached to a medical device or a medical device component, and a second end that is not attached to a medical device or a medical device component.
3. The embolic coil of claim 1 , wherein the wound ribbon includes more than two windings.
4. The embolic coil of claim 1 , wherein the strip of material has a rectangular transverse cross-section having a width and a length, and the length is greater than the width.
5. The embolic coil of claim 4 , wherein the length of the rectangular transverse cross-section is at least 0.001 inch.
6. The embolic coil of claim 5 , wherein the length of the rectangular transverse cross-section is at most 0.005 inch.
7. The embolic coil of claim 4 , wherein the width of the rectangular transverse cross-section is at least 0.0005 inch.
8. The embolic coil of claim 7 , wherein the width of the rectangular transverse cross-section is at most 0.005 inch.
9. The embolic coil of claim 1 , wherein a ratio of the length of the rectangular cross-section to the width of the rectangular cross-section is at most about 75:1.
10. The embolic coil of claim 1 , further comprising at least one fiber.
11. The embolic coil of claim 10 , wherein the consecutive windings include a first winding and a second winding, and the at least one fiber is disposed between the first and second windings.
12. The embolic coil of claim 11 , wherein the first and second windings are consecutive windings.
13. The embolic coil of claim 12 , wherein the at least one fiber is snapped in between adjacent windings of the wound ribbon.
14. The embolic coil of claim 10 , wherein the at least one fiber is snapped in between adjacent windings of the wound ribbon.
15. The embolic coil of claim 1 , wherein the strip of material comprises a metal.
16. The embolic coil of claim 1 , wherein the strip of material comprises a radiopaque material.
17. The embolic coil of claim 1 , wherein the strip of material has a square transverse cross-section.
18. The embolic coil of claim 1 , further comprising:
a first bunch of fibers; and
a second bunch of fibers,
wherein a distance between the first bunch of fibers and the second bunch of fibers is at least two millimeters.
19. The embolic coil of claim 1 , wherein a stiffness of the wound ribbon is at most about 0.01 pound-force.
20. The embolic coil of claim 19 , wherein a stiffness of the wound ribbon is at least about 0.001 pound-force.