Several alternative designs, structures, assemblies, treatment methods andor methods of manufacturing medical closure devices adapted andor configured for closing an opening, for example, an incision or a puncture in the tissue of a patient, for example, the dural membrane of a patient. The shaving tray defines a chamber configured to receive and hold shavings produced during a sharpening operation. The programming language application associates the geometry of the object with the engineering rules such that any change made to the geometry is automatically reflected in the engineering rules and any change made to the engineering rules is reflected in the geometry. In this motor controller, execution of square-wave control on the motor is permitted only over a predetermined time period, when the converter circuit is not boosting the DC power and an operating point of the motor is included in the resonance region. These barriers are shaped so that only one of either a largest log or a smallest log, which it is expected that the singulator should handle, can rest on the primary lifting devices and be carried upward at a time.