Fracture resistant stimulation lead
A lead may comprise a multiple filar wire comprising an inner core, an inner layer and an outer layer, where a portion of the inner layer is wound in a first orientation and the inner layer comprises a first number of filars of wire and where a portion of the outer layer is wound in a second orientation opposite the first orientation and the outer layer comprises a second number of filars of wire, the second number of filars of wire being greater than the first number of filars of wire. The lead may also comprise insulation covering a portion of the multiple filar wire, the portion of the multiple filar wire and the insulation comprising a helical coil structure wound in the first orientation and an anchor formed by the inner core, inner layer and outer layer extending away from the portion of the multiple filar wire, wherein the anchor comprises no helical coil structure.
1. A lead comprising:
a multiple filar wire comprising an inner core, an inner layer and an outer layer,
wherein a portion of the inner layer is wound in a first orientation and the inner layer comprises a first number of filars of wire,
wherein a portion of the outer layer is wound in a second orientation opposite the first orientation and the outer layer comprises a second number of filars of wire, the second number of filars of wire being greater than the first number of filars of wire;
insulation covering a portion of the multiple filar wire, the portion of the multiple filar wire and the insulation comprising a helical coil structure wound in the first orientation; and
an anchor formed by the inner core, inner layer and outer layer extending away from the portion of the multiple filar wire, wherein the anchor comprises no helical coil structure.
2. The lead of claim 1 , wherein the anchor is bent relative to the portion of the multiple filar wire between about 40 degrees and 100 degrees.
3. The lead of claim 1 , wherein the anchor is bent relative to the portion of the multiple filar wire at about 90 degrees.
4. The lead of claim 1 , wherein the anchor is bent relative to the portion of the multiple filar wire between about 40 degrees and 90 degrees.
5. The lead of claim 1 , wherein the anchor is bent relative to the portion of the multiple filar wire at about 70 degrees.
6. The lead of claim 1 , wherein the first number of filars of wire comprises six filars of wire.
7. The lead of claim 1 , wherein the second number of filars of wire comprises twelve filars of wire.
8. The lead of claim 1 further comprising a ball attached to an end of the anchor, wherein the ball prevents the inner core, inner layer and the outer layer from coming apart.
9. The lead of claim 1 , wherein the first orientation comprises a left-hand lay.
10. The lead of claim 1 , wherein the first orientation comprises a right-hand lay.
11. The lead of claim 1 , wherein the multiple filar wire is formed from 316LVM stainless steel.
12. The lead of claim 1 , wherein a length of the multiple filar is free of insulation and comprises the helical coil structure wound in the first orientation.
13. The lead of claim 12 , wherein the length of the multiple filar comprises an electrode.
14. A lead comprising:
an inner core;
an inner layer comprising a first number of filars, wherein a portion of a length of the inner layer is wound in a first orientation;
an outer layer comprising a second number of filars, wherein a portion of a length of the outer layer is wound in a second orientation opposite the first orientation, the second number of filars being greater than the first number of filars;
insulation covering a second portion of the length of the outer layer, wherein the portion of the length of the outer layer, the portion of the length of the inner layer and the insulation comprise a helical coil structure wound in the first orientation; and
an anchor formed by a portion of a length of the inner core, a third portion of the length of the inner layer and a third portion of the length of outer layer, wherein the anchor comprises no helical coil structure.
15. The lead of claim 14 , wherein a distance between the portion of the length of the outer layer and the third portion of the length of the outer layer is free of insulation and comprises the helical coil structure wound in the first orientation.
16. The lead of claim 15 , wherein the distance comprises an electrode.
17. The lead of claim 14 , wherein the anchor is bent relative to the helical coil structure between about 40 degrees and 100 degrees.
18. The lead of claim 17 , wherein the anchor is bent relative to the helical coil structure at about 90 degrees.
19. The lead of claim 14 , wherein the anchor is bent relative to the helical coil structure between about 40 degrees and 90 degrees.
20. The lead of claim 19 , wherein the anchor is bent relative to the helical coil structure at about 70 degrees.
21. The lead of claim 14 , wherein the first number of filars comprises six filars.
22. The lead of claim 21 , wherein the second number of filars comprises twelve filars.
23. The lead of claim 22 further comprising a ball attached to an end of the anchor, wherein the ball prevents the inner core, inner layer and the outer layer from coming apart.
24. The lead of claim 22 , wherein the first orientation comprises a left-hand lay.
25. The lead of claim 24 , wherein the inner core, inner layer and outer layer are formed from 316LVM stainless steel.
26. The lead of claim 22 , wherein the first orientation comprises a right-hand lay.
27. A lead comprising:
an inner core comprising a single filar;
an inner layer comprising a first number of filars a portion of a length of the inner layer is wound in a first orientation around the inner core;
an outer layer comprising a second number of filars a portion of a length of the outer layer is wound in a second orientation opposite the first orientation, the second number of filars being greater than the first number of filars;
insulation covering a second portion of the length of the outer layer and inner layer and a portion of a length of the inner core, wherein the insulation the second portion of the length of the outer layer and inner layer and the portion of a length of the inner core comprise a helical coil structure wound in the first orientation; and
an anchor formed by a third portion of the length of the inner core, a third portion of the length of the inner layer and a second portion of the length of outer layer, wherein the anchor comprises no helical coil structure.
28. The lead of claim 27 , wherein a distance between the portion of the length of the outer layer and the third portion of the length of the outer layer is free of insulation and comprises the helical coil structure wound in the first orientation.
29. The lead of claim 28 , wherein the distance comprises an electrode.
30. The lead of claim 27 , wherein the anchor is bent relative to the helical coil structure between about 40 degrees and 100 degrees.
31. The lead of claim 27 , wherein the anchor is bent relative to the helical coil structure at about 90 degrees.
32. The lead of claim 27 , wherein the anchor is bent relative to the helical coil structure between about 40 degrees and 90 degrees.
33. The lead of claim 27 , wherein the anchor is bent relative to the helical coil structure at about 70 degrees.
34. The lead of claim 27 , wherein the first number of filars comprises six filars.
35. The lead of claim 27 , wherein the second number of filars comprises twelve filars.
36. The lead of claim 27 further comprising a ball attached to an end of the anchor, wherein the ball prevents the inner core, inner layer and the outer layer from coming apart.
37. The lead of claim 27 , wherein the first orientation comprises a left-hand lay.
38. The lead of claim 27 , wherein the first orientation comprises a right-hand lay.
39. The lead of claim 27 , wherein the inner core, inner layer and outer layer are formed from 316LVM stainless steel.