US Patent 10045782 Surgical stapling loading unit with stroke counter and lockout

A surgical loading unit for use with a handle assembly includes an elongate outer frame, an end effector mounted to a distal end of the outer frame, a drive at least partially disposed within the outer frame and operatively coupled to the end effector, and a rotatable counter mounted to the outer frame and adapted for rotational movement about the longitudinal axis. A counter actuator is mounted to the drive and dimensioned to engage the rotatable counter to cause rotational movement of the rotatable counter through an arc segment of rotation during each firing stroke of the drive.