Abstract: Various embodiments are directed to a method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument. The method comprises generating at least one electrical signal. The at least one electrical signal is monitored against a first set of logic conditions. A first response is triggered when the first set of logic conditions is met. A parameter is determined from the at least one electrical signal.

Abstract: A method for determining motional branch current in an ultrasonic transducer of an ultrasonic surgical device over multiple frequencies of a transducer drive signal. The method may comprise, at each of a plurality of frequencies of the transducer drive signal, oversampling a current and voltage of the transducer drive signal, receiving, by a processor, the current and voltage samples, and determining, by the processor, the motional branch current based on the current and voltage samples, a static capacitance of the ultrasonic transducer and the frequency of the transducer drive signal.

Abstract: A device for cleaning surfaces, especially curved or irregular surfaces. The cleaning device includes a base including a generally flat plate possessing a plurality of holes and a conical projection extending away from one side of the plate. The distal end of the conical projection is adapted to receive a longitudinal end of a hollow rod or pole. The device also includes a pillow filled with polystyrene pellets which is glued to the flat base, adjacent to the holes. A cleaning fluid may be delivered under pressure through the hollow rod, into the cavity of the conical projection, and through the holes of the plate to the pillow. Alternatively, a vacuum suction source may be applied to the interior of the hollow rod, whereby liquid in the pillow is sucked through the holes and into the cavity. Alternatively, a generally rectangular cover may selectively surround the pillow, with the corners of the cover being selectively crimped in serrated slits in the peripheral edge of the plate.

Abstract: A device for cleaning dust, grime, and the like from a curved surface such as the interior surface of a skylight window. The device includes a base including a substantially flat, flexible plate and a conical projection extending away from one side of the plate. The distal end of the conical projection is adapted to receive an end of a long pole. The device also includes a pillow filled with polystyrene pellets adapted to be releasably mounted on the side of the plate opposite to the conical projection. The pillow is preferably fashioned of a fabric material suited for removing the dirt and is deformable to a degree such that the shape of the pillow may assume the shape of a curved surface against which the pillow is in forcible contact. The pillow may be releasably attached to the plate by means of hook and loop fasteners. Alternatively, a flexible, removable, interchangeable cover may surround the pillow for the purpose of removing the dirt.