Fracture resistant stimulation lead

A lead 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 different from 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, wherein a portion of the inner core extends beyond the inner and outer layers forming an anchor and wherein at least a portion of the anchor is uninsulated forming an electrode.

A lead comprising:

• an inner core;
• an inner layer, wherein at least a portion of a length of the inner layer is wound in a first orientation;
• an outer layer, wherein at least a portion of a length of the outer layer is wound in a second orientation different from the first orientation;
• wherein the portion of the length of the outer layer and the portion of the length of the inner layer comprise a helical coil structure wound in the first orientation;
• insulation covering at least a portion of the helical structure;
• and
• an anchor formed from the inner core, inner layer and outer core and extending from the helical structure, wherein the anchor comprises no helical coil structure.

A lead comprising:

• an inner core comprising a single filar;
• an inner layer wound in a first orientation around the inner core;
• an outer layer wound in a second orientation opposite the first orientation;
• insulation covering a portion of a length of the outer layer and inner layer and a portion of a length of the inner core, wherein the insulation, the portion of the length of the outer layer and inner layer and the portion of the length of the inner core comprise a helical coil structure;
• and
• an anchor formed by the inner core, the inner layer and the outer layer, wherein the anchor comprises no helical coil structure.