US Patent 10441281 surgical instrument including securing and aligning features

A powered surgical stapler comprising an outer housing body, a shaft housing rotatable relative to the outer housing body, an elongate shaft extending from the shaft housing and including a driver, an inner housing assembly configured to be removably attached to the outer housing body, a plurality of securing features, and a loading unit is disclosed. The inner housing assembly comprises a motor configured to output rotary motions, a battery, control electronics in signal communication with the motor and a shaft output configured to be driven by the motor. The plurality of securing features are configured to align and hold the inner housing assembly in a position which allows the shaft output to be operably attached to the driver. The loading unit is removably attachable to the elongate shaft and comprises an end effector configured to perform an end effector function in response to the rotary motions of the motor.