Determination of premature staple ejection

A surgical device comprising:

• an adapter assembly including:
• a transmission assembly;
• a reload coupled to the transmission assembly;
• a handle assembly including:
• a power source;
• and
• a motor coupled to the power source, the motor configured to move the transmission assembly;
• and
• a controller configured to perform a stapling operation calibration process, during which the controller is configured to:
• operate, during a first portion of the calibration process, the motor to move the transmission assembly distally from an initial position to a distal position;
• operate, during a second portion of the calibration process, the motor to move the transmission assembly proximally from the distal position until a hard stop is reached, wherein the hard stop is positioned proximally from the initial position;
• determine a distance traveled by the transmission assembly during movement from the distal position to the hard stop based on revolutions of the motor;
• and
• compare the determined distance traveled to a threshold distance to determine that one or more of the staples have been ejected.

A method for operating a powered surgical device, the method comprising:

• performing a stapling operation calibration process including:
• operating, as a first portion of the calibration process, a motor to move a transmission assembly distally from an initial position to a distal position, wherein a reload comprising staples is coupled to the transmission assembly;
• operating, as a second portion of the calibration process, the motor to move the transmission assembly proximally from the distal position until a hard stop is reached;
• determining a distance travelled by the transmission assembly during movement from the distal position to the hard stop;
• and
• comparing the determined distance travelled to a threshold distance to whether the distal movement of the transmission assembly to determine that one or more the staples have been prematurely ejected from the reload as part of the first portion of the calibration process.