DETAILS OF THE DISCLOSURE The device for injecting liquid without needle, comprises an elongated body in two separable parts placed end to end, of which the first, called medical, comprises at least one housing receiving a sealed cartridge containing the liquid to be injected. This cartridge has a movable bottom, the displacement of which sends liquid from the cartridge to at least one metering chamber with variable volume, formed in the first part and communicating with a nozzle fitted with an injector capable of forming a jet of narrow liquid following a sudden discharge of the liquid out of the dosing chamber. The second of the two separable parts, called the motor, comprises a mobile assembly with reciprocating movement and pneumatically controlled. This movable assembly includes a working piston and a control and propulsion spring acting on this piston while being progressively compressed under the effect of the displacement of a thrust piece, caused by a pressure of compressed air in a sealed chamber provided in the body. The displacement of the thrust piece occurs until the moment when the spring is suddenly released with release of the compressed air pressure, ensuring the rapid movement of the piston and the expulsion of the liquid out of the metering chamber before return to the initial position of the thrust piece.
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