Compressed gas device for spraying a single dose of a fluid substance in finely divided form

A compressed gas device for spraying a single dose of a fluid substance in finely divided form, the device comprising:

• a tank (1, 101) containing said single dose, said tank having an inlet orifice (2, 102) for compressed gas and an outlet orifice (3, 103);
• manually-actuated gas compression means (4, 104), said gas compression means (4, 104) comprising a supply of gas (5, 105) communicating with the inlet orifice (2, 102) of the tank (1, 101) via an intermediate channel (6, 16) said intermediate channel including a length of narrowed section (7, 107), said length of narrowed section being closed in sealed manner by a plug (8, 103) which is held in said length of narrowed section so that when the pressure of the gas contained in the supply of gas (5, 105) reaches a predetermined threshold, said plug (8, 103) is expelled from said length of narrowed section (7, 107) towards the tank (1, 101) of substance, thereby opening said intermediate channel (6, 106);
• the device including means (9, 10, 11, 112) for limiting the displacement of the plug (8, 13) towards the outlet orifice of the tank of said substance, thereby defining an abutment position for the plug;
• the device being characterized in that said means (9, 10, 11, 112) for limiting displacement of the plug include means (9c, 10a, 11a, 112a) for guaranteeing that the compressed gas can continue to flow when the plug is in its abutment position.