User feedback through handpiece of surgical instrument

1. A surgical instrument comprising:

(a) a handle assembly, wherein the handle assembly comprises a user feedback feature;

(b) a shaft assembly extending distally from the handle assembly; and

(c) an end effector disposed at a distal end of the shaft assembly, wherein the end effector is operable to deliver energy from the shaft assembly to a surgical site;

wherein the user feedback feature is operable to provide feedback to the user, indicating information relating to multiple steps of operation of the end effector including indicating activation of the end effector and indicating whether a threshold impedance value has been reached.

2. The surgical instrument of claim 1 , wherein the user feedback feature is operable to provide at least one of a visual, an auditory, or a haptic feedback and is operable to provide information relating to at least one of amplitude of a blade of the end effector or a power level associated with the surgical instrument.

3. The surgical instrument of claim 1 , wherein the handle assembly further comprises a user input feature, wherein the end effector includes an active feature responsive to actuation of the user input feature, and wherein the active feature is operable to operate on tissue in response to actuation of the user input feature.

4. The surgical instrument of claim 3 , wherein the user feedback feature is operable to provide haptic feedback to a user.

5. The surgical instrument of claim 4 , wherein the user feedback feature comprises a haptic motor configured to vibrate in response to a signal of a change in a status of the surgical instrument.

6. The surgical instrument of claim 4 , wherein the user input feature comprises a feedback pad configured to receive one or more user inputted setting commands, and wherein the feedback pad and the user feedback feature form one of a single unit or separate units.

7. The surgical instrument of claim 3 , wherein the user feedback feature comprises a visual indicator operable to provide visual feedback to a user.

8. The surgical instrument of claim 7 , wherein the visual indicator is configured to display information upon a screen disposed on the surgical instrument in response to a signal of a change in a status of the surgical instrument.

9. The surgical instrument of claim 8 , wherein the user input feature comprises a trigger, wherein the change in status is associated with a force applied to the trigger.

10. The surgical instrument of claim 8 , further comprising a force sensor, wherein the user input feature comprises a trigger, wherein the force sensor is operable to measure force applied through the trigger.

11. The surgical instrument of claim 10 , wherein the force sensor comprises a spring loaded gauge in communication with the trigger.

12. The surgical instrument of claim 10 , wherein the force sensor is selected from the group consisting of a pressure sensor in communication with the trigger, a pressure sensor in communication with the end effector, an acoustic impedance sensor, a tissue impedance sensor, and a displacement measuring device.

13. The surgical instrument of claim 8 , wherein the displayed information comprises at least one of a pattern display or a bar display.

14. The surgical instrument of claim 8 , further comprising a removable cartridge disposed in the handle assembly, wherein the screen comprises clear plastic and is disposed on a proximal, upper surface of the handle assembly, wherein the user feedback feature comprises one or more lighting devices in communication with the cartridge, wherein the lighting devices are operable to emit light through the clear plastic screen.

15. The surgical instrument of claim 8 , wherein the user feedback feature further comprises a flexible display, wherein the cartridge is in electrical communication with the flexible display, wherein the flexible display is disposed below the clear plastic lens.

16. The surgical instrument of claim 1 , wherein the threshold impedance value comprises a tissue impedance value.

17. The surgical instrument of claim 1 , wherein the threshold impedance value comprises an acoustic impedance value.

18. A surgical instrument comprising:

(a) a handle assembly, wherein the handle assembly comprises:

(i) a user input feature,

(ii) a user feedback feature;

(b) a shaft assembly extending distally from the handle assembly; and

(c) an end effector disposed at a distal end of the shaft assembly, wherein the end effector includes an active feature responsive to actuation of the user input feature, wherein the active feature is operable to operate on tissue in response to actuation of the user input feature, wherein the end effector further includes at least one electrode;

wherein the user feedback feature is operable to provide haptic feedback to the user, indicating information relating to multiple stages of operation of the end effector including indication of activation of the end effector and confirmation of severing and sealing tissue by the end effector.

19. The instrument of claim 18 , wherein the user feedback feature is configured to vibrate in response to a level of impedance sensed in tissue engaged by the end effector.

20. The instrument of claim 18 , wherein the user feedback feature is further operable to provide an auditory feedback to the user, indicating information relating to operation of the end effector.

21. The instrument of claim 18 , wherein the handle assembly comprises a pistol grip, wherein at least part of the user feedback feature is positioned within the pistol grip to transmit haptic feedback to a user through the pistol grip.