Abstract: The present invention relates to a drug preparation and drug delivery device comprising: a drug preparation unit comprising at least two receptacles capable of containing constituents to be mixed, at least one of the receptacles being movable inside the drug preparation unit, a drug administration means, such as an injection or spray means, a fluid circuit capable of fluidically connecting the at least two receptacles and the administration means, the connecting of the fluid circuit with the at least two receptacles being made using at least two piercing means when said at least two receptacles move from an initial position to a contact position with said at least two corresponding piercing means, an electromechanical assembly for fluidically driving the constituents within the fluid circuit, characterised in that said drug preparation unit comprises a release mechanism comprising a compressed drive spring which, when it is released, is capable of generating a movement along an axis A1 of at least one of the

Abstract: The invention relates to a fluid spray nozzle which is intended to be mounted on a distribution receptacle, the nozzle comprising at least one fluid inlet capillary extending longitudinally along an axis, a supply means to receive the fluid from the at least one inlet capillary in order to supply it to a pillar comprising at least two pipes, the pipes extending longitudinally along the axis A1 and being radially offset relative to the axis, at least two turbulence channels in fluid connection with the at least two pipes, a turbulence chamber for receiving the fluid coming tangentially from the at least two turbulence channels in order to supply at least one spray opening having axial symmetry and a constant cross-section s, the chamber having a cross-section decreasing towards the opening and having a maximum cross-section S and a maximum diameter, the ratio of the cross-section s of the spray opening to the maximum cross-section S of the turbulence chamber is 1%?s/S?20%.