1. An injection device used in conjunction with a cartridge or syringe to dispense multiple doses of the contents of the cartridge or syringe, comprising: a housing (10, 10) for the cartridge or syringe； a plunger (40), when using the device, interacting with the cartridge or syringe for sequential withdrawal doses； a dose setting unit (16, 20) that provides a choice of the dose volume； a drive mechanism (22, 24) that is released for sequential withdrawal of these doses by means of a discrete feed of the plunger with preliminary setting of the step size at the feed, characterized in that the drive mechanism contains a drive spring (22) for imparting movement to the plunger (40) directly or through other parts, and the dose setting unit contains a component (16) for setting the dose, moved during the dose setting to set the discrete value supplying the plunger corresponding to a given dose, while the drive mechanism further comprises a sleeve configured to block the plunger moving forward and / or isolate the component for installation at the dose setting stage dose of force generated by the drive pruzhinoy.2. The device according to claim 1, characterized in that the component (16) for setting the dose is rotatable while setting the value of the discrete feed of the plunger. 3. The device according to claim 2, characterized in that the coupling (56) contains an element configured to move between non-blocking and blocking positions. The device according to claim 3, characterized in that the coupling element (56) is made with the possibility of axial movement together with the element for setting the dose, while the axial movement of the lump1. Устройство для инъекций, используемое совместно с картриджем или шприцем для выдачи множества доз содержимого картриджа или шприца, содержащее:корпус (10, 10) для картриджа или шприца；плунжер (40), при использовании устройства взаимодействующий с картриджем или шприцем для последовательного выведения доз；узел (16, 20) установки
