Described herein are endoscopic staplers used to apply one or more fasteners to body tissue. The track may be divided into zones which are scanned with constant angular velocity. A dislocation-free single crystal having a heavy weight can be produced with a high crystal quality, and the method is applicable to various operation modes at which the apparatus is operated under various conditions of crystal growth. A latch mechanism is supported on the pod body side surface of the flange portion in such a way that it can slide in a direction parallel to the side wall of the flange. A key fob transmitter transmits signals to a smart fixture for summoning emergency assistance.