Methods for making leads with radially-aligned segmented electrodes for electrical stimulation systems

1. A method of making a stimulation lead, the method comprising:

attaching a plurality of segmented electrodes to a carrier;

attaching a plurality of conductors to the plurality of segmented electrodes;

forming the carrier into a cylinder with the plurality of segmented electrodes disposed within the cylinder;

molding a lead body around the plurality of segmented electrodes disposed on the carrier, wherein the plurality of segmented electrodes form at least two sets of segmented electrodes, wherein each of the at least two sets contains at least two of the segmented electrodes disposed around a circumference of the lead body at a same longitudinal position on the lead body; and

grinding at least a portion of the carrier away to separate the segmented electrodes.

2. The method of claim 1 , wherein grinding at least a portion of the carrier away comprises grinding all of the carrier away.

3. The method of claim 1 , further comprising attaching at least one ring electrode to the carrier.

4. The method of claim 3 , where each of the at least one ring electrode has a notch in an edge of the ring electrode to facilitate attachment of a conductor to the ring electrode.

5. The method of claim 1 , wherein each of the segmented electrodes comprises a tab and wherein molding the lead body comprises molding the lead body around the segmented electrodes so that the tabs on the segmented electrodes extend into the lead body.

6. The method of claim 5 , wherein, for at least one of the segmented electrodes, the tab defines at least one hole through the tab.

7. The method of claim 1 , wherein the carrier has at least one slot or tab formed in the carrier.

8. The method of claim 1 , wherein the carrier is a metal or alloy carrier.

9. The method of claim 1 , wherein molding the lead body comprises disposing the carrier and plurality of segmented electrodes in a mold and introducing a material into the mold to form the lead body.

10. The method of claim 1 , wherein each of the segmented electrodes has a curved form extending over an arc in a range of 50 to 180 degrees.

11. The method of claim 1 , wherein forming the carrier into a cylinder comprises forming the carrier into a cylinder around a mandrel.

12. The method of claim 1 , wherein each of the segmented electrodes comprises a corrugated interior surface.

13. The method of claim 1 , wherein each of the sets of segmented electrodes comprises at least three of the segmented electrodes.

14. The method of claim 13 , further comprising attaching at least two ring electrodes to the carrier.

15. The method of claim 14 , wherein one of the at least two ring electrodes is disposed distal to all of the segmented electrodes and another of the at least two ring electrodes is disposed proximal to all of the segmented electrodes.

16. The method of claim 1 , wherein each of the segmented electrodes comprises two tabs disposed on opposite ends of the segmented electrode.

17. The method of claim 16 , wherein molding the lead body comprises molding the lead body around the segmented electrodes so that the tabs on the segmented electrodes extend into the lead body.

18. The method of claim 16 , wherein, for at least one of the segmented electrodes, the two tabs are angled toward each other.

19. The method of claim 16 , wherein, for at least one of the segmented electrodes, each of the tabs defines at least one hole through the tab.

20. The method of claim 1 , wherein the carrier comprises two slots or tabs formed in the carrier opposite each other to aid in alignment when the carrier is formed into a cylinder.