Abstract: A device for delivering fluid, comprising an elongated outer casing (10) provided with a substantially cylindrical inner chamber (11); a plunger (21) movable axially along a longitudinal axis A-A of an inner reservoir (22) towards an outlet (28); an actuator comprising a multi-stage lead-screw with a plurality of coaxial, screwably-interconnected bushings and an output spindle or an output bushing linked to the movable plunger (21), whereby a rotation of the rotating element causes a translation of the bushings relative to each other in telescopic fashion, and a translation of the movable plunger in the cartridge.

Abstract: A device for delivering fluid, having an elongated outer casing (10) provided with a substantially cylindrical inner chamber (11); an inner cartridge (20), for insertion into the inner chamber (11) and including a plunger (21) movable axially along a longitudinal axis A-A of an inner reservoir (22) towards an outlet (28). The device also includes a coil assembly (12, 23, 24) having an outer coil (12), an inner coil (23) and an inner coil core (24). The outer coil (12) is provided on the outer casing (10) and axially oriented along the chamber longitudinal axis. And, the inner coil (23) is provided in the inner cartridge (20) attached to the movable plunger (21).