An injection device (10) comprises an injection solution receptacle (30) and a plunger (70) at least a portion of which is slidably received in the injection solution receptacle (30), wherein the plunger (70) is displaceable relative to the injection solution receptacle (30) in a distal direction in order to expel an injection solution contained in the injection solution receptacle (30) from the injection solution receptacle (30). A first plunger stop mechanism (140) is adapted to stop a displacement of the plunger (70) relative to the injection solution receptacle (30) in the distal direction at a first dosing position (P1). A second plunger stop mechanism (140) is adapted to stop a displacement of the plunger (70) relative to the injection solution receptacle (30) from the first dosing position (P1) in the distal direction at a second dosing position (P2), wherein the first and the second dosing position (P2) of the plunger (70) are selected in such a manner that the plunger (70), upon being displaced relative to the injection solution receptacle (30) between the first and the second dosing position (P2) is adapted to expel a desired dose of the injection solution contained in the injection solution receptacle (30) from the injection solution receptacle (30).Un adaptateur de remplissage (12) pour raccorder une seringue (14) contenant une solution d'injection à un dispositif d'injection (10), l'adaptateur de remplissage (12) comprend un manchon (16) creux et un élément adaptateur (18) logé dans le manchon (16), l'élément adaptateur (18) comprend un premier orifice de raccordement (20) conçu pour être raccorder à la seringue (14) et un second orifice de raccordement (22) conçu pour être raccorder au dispositif d'injection (10), et l'élément adaptateur (18) étant pourvu d'une ouverture traversante (26) s'étendant à travers celui-ci. Une canule (27) fait saillie à partir du deuxième orifice de raccordement (22) de l'élément adaptateur (18), la canule (27) étant dispos
