A spray or injection device (1) for spraying or injecting a product of interest, in liquid form, making it possible to deliver at least a first and a second preset dose of said product in succession, said device extending along a reference axis from a distal end to a proximal end, comprising:
- an axially elongate container (2, 50) containing said product,
- a plunger (4, 53, 60) placed in the container and blocking off the latter, said piston being axially moveable with respect to the container, in a reference direction, allowing said product to be propelled distally from the container,
- a casing (6) designed to accommodate and axially secure said container,
- a pusher (5) assembled with the casing (6), moveable with respect to the latter, designed to come into axial and proximal abutment against the container or the plunger, and to move said plunger in the reference direction,
- means (17, 33, 36, 37) for controlling the length of travel of the pusher with respect to the casing, these means being designed to divide this travel into a first travel portion and a second travel portion, determining the respective delivery of the first and second doses, said device being characterized in that the casing (6) and the pusher (5) are designed to be axially moveable one with respect to the other in a pushing direction, generating the movement of the plunger in the reference direction, and
- in that the control means comprise:
- at least one tab (17) arranged on the pusher (5) or the casing (6), able to move between a first, unstressed, normal position in which said tab does not block the axial movement of the pusher, and a stressed, flexed, second position in which said tab halts the axial movement of the pusher, said tab at its free end comprising a pressing region or element (17a) designed to contribute both to the halting of the axial movement of the pusher (5) and to the flexing of the tab (17) under the effect of the axial movement of the pusher,
- at least one ramp (86) cooperating with said tab from an end known as the initial end (86a) to an end known as the final end (86b) and arranged respectively on the casing (6) or on the pusher (5), against which the pressing region or element (17a) of said tab (17) bears in the direction of pressure of said pusher (5) said ramp being designed to bring said tab from its normal first position to its flexed second position,
- at least one stop (36) cooperating with the pressing region or element (17a) of the tab (17), arranged respectively on the casing (6) or the pusher (5), respectively beyond or before the final end (86b) of the ramp (86) in the direction of pressure, against which the pressing region or element (17a) of the tab (17) finally abuts in its flexed second position,
- at least one nonpressing region or opening (22) which is either arranged on the tab (17) before or beyond said pressing region or element (17a), depending on whether said tab is arranged on the pusher (5) or on the casing (6), or arranged on the casing (6), before the stop (36) when the tab (17) is arranged on the pusher (5) and the pressing element (17a) cooperates with a hollowed ramp (86) formed on the casing, said nonpressing region or opening (22) being designed to allow said pressing region or element (17a) to return to its unstressed normal position from the halted and flexed position of the tab 17 when the pressure on the pusher (5) is released,
- the first portion of travel of the pusher (5) being determined by the movement of this pusher as far as its axial stop position, following contact between the pressing region or element (17a) and the stop (36), and the second portion of travel being determined by the movement of the pusher beyond the axial position in which the nonpressing region or opening (22) has accommodated the pressing region or element (17a).