Surgical instrument with feedback at end effector

An apparatus comprising:

• (a) a handpiece;
• (b) an end effector in communication with the handpiece, wherein the end effector comprises a first and second jaw, wherein the end effector is configured to clamp, cut, and seal tissue;
• and
• (c) an energy sensitive region, wherein the energy sensitive region is positioned on a portion of the end effector, wherein the energy sensitive region is configured to alter the energy sensitive region's visual appearance in response to the application of energy to the end effector.

An apparatus comprising:

• (a) a handpiece;
• (b) an end effector in communication with the handpiece, wherein the end effector is configured to clamp and cut tissue;
• (c) a feedback controller in communication with the end effector, wherein the feedback controller is configured to detect at least one aspect of the end effector;
• and
• (d) a signal device in communication with the feedback controller, wherein the signal device is configured to inform a user of a change in the at least one aspect of the end effector, wherein the signal device is positioned within the handpiece.