Systems and methods, including computer software, for reading data from a flash memory cell involve detecting voltages from a group of memory cells. The device comprises an elongate tube formed, at an upper end thereof, with a tubular body part; a pair of fixing balloons attached up and down to an outer surface of the tubular body part such that a clamping portion is defined between the fixing balloons; and a tube opening and closing balloon attached to an inner surface of the tubular body part. The shroud includes an inner wall surface and an outer wall surface. The injection device adds to the liquid an oscillation energy based on a change of volume of the chamber caused by the piezoelectricelectrostrictive element, for atomizing the liquid to be injected. In one embodiment, each jaw is curved upwardly towards its distal end along the longitudinal axis of the body portion and has a radius of curvature r of between about 0.