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A device for spraying at least one substance onto a medium includes a supply of vector gas, a substance feed in communication with a supply of the substance and at least one shutter which interrupts communication between the substance feed and the supply of substance. The substance can be sucked fro

A device for spraying at least one substance onto a medium includes a supply of vector gas, a substance feed in communication with a supply of the substance and at least one shutter which interrupts communication between the substance feed and the supply of substance. The substance can be sucked from the supply by suction established in the vicinity of the substance feed by emission of the vector gas. The vector gas is emitted from at least one gas outlet orifice located in the vicinity of the substance feed.

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What is claimed as new and desired to be secured by Letters Patent of the United States is: 1. A device for spraying at least one substance onto a medium, the device comprising: a supply of vector gas; at least one substance feed that communicates with a supply of said substance, the substance bein

What is claimed as new and desired to be secured by Letters Patent of the United States is: 1. A device for spraying at least one substance onto a medium, the device comprising: a supply of vector gas; at least one substance feed that communicates with a supply of said substance, the substance being sucked from the supply of said substance by suction established in a vicinity of said at least one substance feed by emission of said vector gas; at least one shutter that interrupts communication between said at least one substance feed and the supply of said substance; and at least two gas outlet orifices, from which said vector gas is emitted, said two gas outlet orifices being positioned such that a vector gas jet emitted from a first of said at least two gas outlet orifices meets another vector gas jet emitted from a second of said at least two gas outlet orifices, wherein the shutter comprises a gasket mounted on a hollow rod, the rod being closed at a bottom end, the gasket being capable of bearing via a top face against a shoulder of the rod, the rod having at least one substance admission orifice passing therethrough, the substance admission orifice being of a diameter that is smaller than or equal to the thickness of the gasket, said gasket being capable of coming into abutment via a bottom face against a stationary bearing wall when the hollow rod is pushed down, thereby causing the gasket to be compressed so as to open the substance admission orifice at least in part and enabling the substance to flow towards said at least one substance feed. 2. A device according to claim 1, wherein said vector gas jets meet in said vicinity of said at least one substance feed. 3. A device according to claim 2, wherein the gas outlet orifices are disposed symmetrically about a spray axis. 4. A device according to claim 3, wherein the substance feed comprises an orifice presenting an axis situated substantially in a same plane as axes of the gas outlet orifices. 5. A device according to claim 2, wherein axes of the gas outlet orifices are at angles of 45° relative to a spray axis. 6. A device according to claim 1, wherein the substance feed comprises at least one orifice. 7. A device according to claim 1, wherein the substance feed comprises at least one member which feeds the substance by capillarity. 8. A device according to claim 1, further comprising a mechanism that reestablishes communication automatically between said at least one substance feed and the supply of said substance while vector gas is being emitted from said at least two gas outlet orifices. 9. A device according to claim 1, further comprising a pushbutton which activates a vector gas dispenser valve and said at least one shutter, whereby communication between said at least one substance feed and the supply of said substance is established when the pushbutton causes the vector gas to be dispensed. 10. A device according to claim 9, wherein said pushbutton activates said vector gas dispenser valve by directly acting on said vector gas dispenser valve. 11. A device according to claim 9, wherein said pushbutton activates said vector gas dispenser valve by indirectly acting on said vector gas dispenser valve. 12. A device according to claim 1, further comprising a first receptacle containing said substance and providing said supply of said substance, said first receptacle being coupled to a second receptacle containing the vector gas and providing said supply of vector gas. 13. A device according to claim 12, wherein said first receptacle and said second receptacle are fixed to each other so as to prevent relative movement during use. 14. A device according to claim 12, wherein the first receptacle containing the substance is annular in shape and defines a passage through which a control member can extend for controlling a valve fitted to the second receptacle containing the vector gas. 15. A device according to claim 12, wherein the receptacle containing the substance is coupled to the receptacle containing the vector gas in a removable manner. 16. A device according to claim 1, wherein said at least one shutter is operationally connected to at least one element actuated by moving a pushbutton. 17. A device according to claim 16, wherein said element comprises a hollow rod having at least one inside passage enabling the substance to reach an orifice of said at least one substance feed. 18. A device according to claim 1, wherein the shutter comprises at least one gasket which closes at least one orifice through which the substance can flow to reach said at least one substance feed, and which uncovers said orifice at least in part while said substance is being dispensed. 19. A device according to claim 1, wherein the gasket bears via a periphery against an inside surface of a duct in which the hollow rod can move axially, the duct being capable of communicating freely with the outside. 20. A device according to claim 1, wherein the hollow rod is actuated by moving a pushbutton that controls emission of the vector gas. 21. A device according to claim 1, wherein space inside the bearing wall, against which the gasket can come into abutment via said bottom face, communicates with a receptacle containing the substance via an annular channel formed in a bottom end wall of said receptacle. 22. A device according to claim 1, further comprising a pushbutton having a bottom portion assembled to a top portion. 23. A device according to claim 22, wherein the bottom portion is integral with an actuator rod extending along a passage in a receptacle containing the substance and providing said supply of said substance. 24. A device according to claim 23, further comprising a control rod of a valve for delivering the vector gas, said control rod being engaged in the actuator rod. 25. A device according to claim 1, wherein the vector gas is contained in liquefied form in a vector gas receptacle providing said vector gas supply. 26. A device according to claim 1, wherein said substance is a liquid. 27. A device according to claim 1, wherein said substance is a powder. 28. A device according to claim 1, further comprising a receptacle containing said substance and providing said supply of said substance. 29. A device according to claim 28, wherein said receptacle defines a microleak. 30. A device according to claim 28, further comprising an air intake valve mounted on said receptacle. 31. A device according to claim 1, wherein the shutter comprises a gasket mounted on a hollow rod. 32. A device according to claim 31, wherein the rod is closed at a bottom end. 33. A device according to claim 32, wherein the gasket is capable of bearing via a top face against a shoulder of the rod. 34. A device according to claim 33, wherein the rod has at least one substance admission orifice passing therethrough. 35. A device according to claim 34, wherein the substance admission orifice is of a diameter that is smaller than or equal to the thickness of the gasket. 36. A device according to claim 35, wherein said gasket is capable of coming into abutment via a bottom face against a stationary bearing wall when the hollow rod is pushed down. 37. A device for dispensing a substance, comprising: a first receptacle containing said substance and defining a substance opening in communication with a substance orifice from which said substance is emitted outside said device; a first member movable with respect to said substance opening, said first member fully covering said substance opening in a first position and at least partly uncovering said substance opening in a second position; a second receptacle containing a gas and defining a gas opening in communication with a gas outlet from which said gas is emitted outside said device, said gas outlet being distinct from said substance orifice; a second member movable with respect to said gas opening, said second member fully covering said gas opening in a first position and at least partly uncovering said gas opening in a second position; and a pushbutton coupled to said first member and to said second member, wherein said first and second members are in their respective first positions when said pushbutton is not pushed and wherein said first and second members move in their respective second positions when said pushbutton is pushed. 38. A device according to claim 37, wherein said gas opening is in communication with two gas outlets from which said gas is emitted outside said device. 39. A device according to claim 37, wherein said gas outlet is in a vicinity of said substance orifice so that gas emitted from said gas outlet creates a suction at the substance orifice. 40. A device according to claim 39, wherein said first member comprises a gasket mounted on a rod coupled to said pushbutton at a first rod end. 41. A device according to claim 40, wherein said rod is hollow and closed at a second rod end. 42. A device according to claim 40, wherein a diameter of said substance opening is smaller than a thickness of said gasket. 43. A device according to claim 37, wherein said second member includes a valve coupled to a valve control rod coupled to said pushbutton. 44. A device according to claim 43, wherein said valve control rod is hollow and coupled to said valve at a first end and coupled to a hollow actuator rod at a second end. 45. A device according to claim 44, wherein said hollow actuator rod is coupled to said pushbutton. 46. A device according to claim 45, wherein said hollow actuator rod is integral with said pushbutton. 47. A device for dispensing a substance, comprising: a gas receptacle; a substance receptacle mounted on said gas receptacle; a pushbutton mounted on said substance receptacle; a substance orifice defined by said pushbutton and in communication with said substance receptacle; and two gas orifices defined by said pushbutton and in communication with said gas receptacle; wherein said substance orifice and said two gas orifices are within a same plane. 48. A device according to claim 47, wherein said substance orifice is positioned between said two gas orifices. 49. A device according to claim 47, wherein said substance orifice communicates with said substance receptacle in part via a radial duct defining a spray axis. 50. A device according to claim 49, wherein said gas orifices communicate with said gas receptacle in part via gas ducts having axes perpendicular to each other. 51. A device according to claim 50, wherein said gas ducts axes are at 45° with respect to said spray axis. 52. A device according to claim 50, wherein said ducts communicate with an axial duct having an axis parallel to an axis of said pushbutton. 53. A device according to claim 52, wherein said axial duct is coaxial with said axis of said pushbutton. 54. A device according to claim 49, wherein said radial duct communicates with an axial duct having an axis parallel to an axis of said pushbutton. 55. A device according to claim 54, wherein said axis of said axial duct is offset from said axis of said pushbutton. 56. A device for spraying at least one substance onto a medium, the device comprising: a supply of vector gas; at least one substance feed that communicates with a supply of said substance, the substance being sucked from the supply of said substance by suction established outside said device in a vicinity of said at least one substance feed by emission of said vector gas; at least one shutter that interrupts communication between said at least one substance feed and the supply of said substance; and at least one gas outlet orifice, from which said vector gas is emitted outside said device, said at least one gas outlet orifice being located in said vicinity of said at least one substance feed; wherein the shutter comprises a gasket mounted on a hollow rod, the rod being closed at a bottom end, the gasket being capable of bearing via a top face against a shoulder of the rod, the rod having at least one substance admission orifice passing therethrough, the substance admission orifice being of a diameter that is smaller than or equal to the thickness of the gasket, said gasket being capable of coming into abutment via a bottom face against a stationary bearing wall when the hollow rod is pushed down, thereby causing the gasket to be compressed so as to open the substance admission orifice at least in part and enabling the substance to flow towards said at least one substance feed.