In an illumination system using mirrors, the facets of a field facet mirror focus plural source images on respective facets of a pupil facet mirror to perform the function of an integrator. The battery optimization system includes a power source, a chargingdischarging station connecting the battery with the power source, and a controller in communication with the chargingdischarging station. A vascular dilator having a tapered distal tip portion is supported within the inner tubular member and is dimensioned to extend beyond the distal end of the inner tubular member for positioning the suturing device at the incision in the wall of the blood vessel. The receiving network device maintains a table identifying which ports are connected to a neighboring network device. The longitudinal direction determination unit determines a longitudinal direction of the valid region. Thus during retraction the joining bolt is drawn to one side of the interface plane by the force of the expanding spring.