Feedback algorithms for manual bailout systems for surgical instruments

A modular surgical stapling instrument, comprising:

• a housing;
• a shaft assembly extending from said housing;
• an end effector extending from said shaft assembly, wherein said end effector comprises:
• a first jaw;
• a second jaw comprising an elongate channel;
• and
• a surgical staple cartridge in said elongate channel;
• a power source replaceably coupled to said housing;
• a firing drive comprising a motor and a firing shaft portion driveable by said motor to perform a staple firing stroke;
• one or more sensors configured to:
• detect an operational parameter of said power source;
• detect a current drawn by said motor during said staple firing stroke;
• and
• detect a parameter of said surgical staple cartridge;
• and
• a controller in communication with said one or more sensors, wherein said controller is configured to:
• determine whether the current drawn by the motor increases beyond a first predetermined percentage;
• in response to the current increasing beyond the first predetermined percentage, reduce a speed of said firing shaft portion to a non-zero value during a surgical staple firing stroke while continuing through said surgical staple firing stroke;
• in response to the current not increasing beyond the first predetermined percentage, maintain previous speed of said firing shaft portion during the surgical staple firing stroke while continuing through said surgical staple firing stroke;
• determine whether the current drawn by the motor increases beyond a second predetermined percentage since the reduction of the speed;
• and
• in response to the current increasing beyond the second predetermined percentage, pause said firing shaft portion for a predetermined period of time during said firing stroke, the second predetermined percentage being different than the first predetermined percentage.