According to the invention, a safety device for a pre-filled syringe comprises of a needle shield adapted to cover an injection needle of the pre-filled syringe before and after an injection, a support body with at least one pivoting arm adapted to engage a barrel collar of the pre-filled syringe and an outer body with a first inner sleeve comprising a bevelled section. The device comprises an applicator including a source of microwave radiation and an array of retractable needles arranged so as to extend from one face of the applicator and, in operation, to confine the irradiated microwave energy field emanating from the applicator. Diaphragmatic stimulation is synchronized with intrinsic inspiration so as to increase the amplitude of diaphragmatic contraction during inspiration. When scanning or printing is interrupted, scan or print setting information set before the interruption, and optionally the image data scanned before the interruption, are acquired.