Surgical instrument with electrical connector

1. A surgical instrument comprising:

a roll drive input shaft and a roll drive input capstan on the roll drive input shaft;

an instrument shaft, an end effector disposed at a distal end of the instrument shaft, and a roll drive output capstan on the instrument shaft;

a roll drive tendon routed around the roll drive input capstan and around the roll drive output capstan, wherein the roll drive input capstan, the roll drive tendon, and the roll drive output capstan are operably coupled to roll the instrument shaft about a longitudinal axis of the instrument shaft;

an electrical connector; and

an electrical conductor separate from the roll drive tendon;

wherein a first end of the electrical conductor is electrically coupled to the electrical connector, wherein the electrical conductor is routed around the roll drive input capstan and around the roll drive output capstan, and wherein a second end of the electrical conductor is electrically coupled to the instrument shaft.

2. The instrument of claim 1 :

wherein the electrical conductor is adjacent the roll drive tendon around at least a portion of the roll drive input capstan, between the roll drive input capstan and the roll drive output capstan, and around at least a portion of the roll drive output capstan.

3. The instrument of claim 2 :

wherein the roll drive tendon and the electrical conductor are routed around the roll drive input capstan in a first direction and around the roll drive output capstan in a second direction that is opposite to the first direction.

4. The instrument of claim 1 :

wherein the roll drive input capstan comprises a groove; and

wherein the roll drive tendon is routed in an inner radius portion of the groove and the electrical conductor is routed in an outer radius portion of the groove.

5. The instrument of claim 4 :

wherein the groove is defined in the roll drive input capstan as a helical shape.

6. The instrument of claim 4 :

wherein the inner radius portion of the groove has a smaller width than the outer radius portion of the groove.

7. The instrument of claim 1 :

wherein the roll drive output capstan comprises a groove; and

wherein the roll drive tendon is routed in an inner radius portion of the groove and the electrical conductor is routed in an outer radius portion of the groove.

8. The instrument of claim 7 :

wherein the groove is defined in the roll drive output capstan as a helical shape.

9. The instrument of claim 7 :

wherein the inner radius portion of the groove has a smaller width than the outer radius portion of the groove.

10. The instrument of claim 1 further comprising:

a second roll drive tendon routed around the roll drive input capstan and around the roll drive output capstan;

wherein the roll drive tendon and the second roll drive tendon are routed around the roll drive input capstan in opposite directions and around the roll drive output capstan in opposite directions.

11. The instrument of claim 1 :

wherein the electrical conductor comprises an insulated wire.

12. The instrument of claim 1 :

wherein the roll drive input shaft comprises a hollow interior, a hole into the hollow interior through a side of the roll drive input shaft, and an exit from the hollow interior at an end of the roll drive input shaft; and

wherein the electrical conductor is routed from the electrical connector, through the exit from the hollow interior, through the hollow interior, and through the hole into the hollow interior to the roll drive input capstan.

13. The instrument of claim 1 :

wherein the electrical conductor is slack between the roll drive input capstan and the roll drive output capstan.

14. The instrument of claim 1 :

wherein the instrument shaft is configured to act as a shield for stray currents from an active electrocautery electrode.

15. The instrument of claim 1 :

wherein the output capstan at a proximal end of the instrument shaft.

16. A method of making a surgical instrument, comprising the acts of:

positioning a roll drive input capstan on a roll drive input shaft;

positioning a roll drive output capstan on a shaft of the instrument, the instrument having an end effector at a distal end of the shaft of the instrument;

routing a roll drive tendon around the roll drive input capstan and around the roll drive output capstan, wherein the roll drive input capstan, the roll drive tendon, and the roll drive output capstan are operably coupled to roll the instrument shaft about a longitudinal axis of the instrument shaft;

electrically coupling a first end of an electrical conductor to an electrical connector on the surgical instrument, wherein the electrical conductor and the roll drive tendon are separate from one another;

routing the electrical conductor around the roll drive input capstan and around the roll drive output capstan; and

electrically coupling a second end of the electrical conductor to the instrument shaft.

17. The method of claim 16 further comprising:

routing the electrical conductor adjacent the roll drive tendon around at least a portion of the roll drive input capstan, between the roll drive input pulley and the roll drive output capstan, and around at least a portion of the roll drive output capstan.

18. The method of claim 17 further comprising:

routing the roll drive tendon and the electrical conductor around the roll drive input capstan in a first direction and around the roll drive output capstan in a second direction that is opposite to the first direction.

19. The method of claim 16 further comprising:

forming a groove in the roll drive input capstan, wherein the groove comprises a relatively smaller width inner radius groove and a relatively larger width outer radius groove;

routing the roll drive tendon in the inner radius groove; and

routing the electrical conductor in the outer radius groove.

20. The method of claim 19 further comprising:

forming the groove helical shape.