Fluid dispenser member

1. A fluid dispenser member having a dispensing wall defining an outside surface and inside surface, said wall being provided with a through dispensing orifice connecting the inside surface to the outside surface, the inside surface forming a leaktight slide cylinder for a piston suitable for moving in leaktight contact inside said cylinder for selectively unmasking the dispensing orifice, said piston forming a wall element of a fluid chamber inside which fluid is selectively put under pressure; the inside surface, at the slide cylinder, forming a fluid swirl system immediately upstream from the dispensing orifice,

wherein the dispensing wall is formed by a substantially cylindrical skirt further provided with a guide wall defining an inside surface whose inside diameter is greater than the inside diameter of the slide cylinder; and

wherein the slide cylinder, the dispensing orifice and the swirl system are formed integrally with the dispensing wall.

2. A fluid dispenser member according to claim 1 , in which the dispensing wall is formed by a pusher having a push wall which is extended at its outer periphery by the dispensing wall.

3. A fluid dispenser member according to claim 2 , in which the piston is urged resiliently against the push wall, and can be moved away from said push wall in order to unmask the dispensing orifice.

4. A fluid dispenser member according to claim 1 , in which the piston is urged resiliently away from the guide wall and can be moved towards said guide wall.

5. A fluid dispenser member according to claim 2 , in which the piston is urged resiliently away from the push wall and can be moved towards said push wall.

6. A fluid dispenser member according to claim 3 , in which the push wall is provided with an inside surface which forms a wall element of the chamber.

7. A fluid dispenser member according to claim 1 , having a body serving to be associated with a fluid reservoir, said body forming a main cylinder in which a main piston slides.

8. A fluid dispenser member according to claim 1 , in which the dispensing wall is formed by a substantially cylindrical skirt which further forms a guide wall defining an inside surface forming a main cylinder for a main piston.

9. A fluid dispenser member according to claim 1 , in which the swirl system comprises at least one swirl channel and a swirl chamber centered on the dispensing orifice and optionally a peripheral feed ring.

10. A fluid dispenser member according to claim 1 , in which the swirl system forms a network that is recessed relative to the substantially cylindrical inside surface of the dispensing wall.

11. The fluid dispenser member according to claim 1 , wherein the inside surface of the guide wall is not in leaktight contact with an opposing surface.

12. The fluid dispenser member according to claim 1 , wherein the swirl system is formed as a one-piece integral construct with the dispensing wall.

13. A fluid dispenser member having a dispensing wall defining an outside surface and inside surface, said wall being provided with a through dispensing orifice connecting the inside surface to the outside surface, the inside surface forming a leaktight slide cylinder for a piston suitable for moving in leaktight contact inside said cylinder for selectively unmasking the dispensing orifice, said piston forming a wall element of a fluid chamber inside which fluid is selectively put under pressure; the inside surface, at the slide cylinder, forming a fluid swirl system immediately upstream from the dispensing orifice,

wherein the dispensing wall is formed by a substantially cylindrical skirt further provided with a guide wall defining an inside surface whose inside diameter is greater than the inside diameter of the slide cylinder; and

wherein the piston is a differential piston which moves in response to variation in the pressure in the chamber, said differential piston having at least one sealing lip in leaktight sliding contact with the slide cylinder.

14. A fluid dispenser member according to claim 13 , in which the differential piston is integral with or secured to a main piston in leaktight sliding contact in a main cylinder.

15. The fluid dispenser member according to claim 13 , wherein the inside surface of the guide wall is not in leaktight contact with the differential piston.

16. A fluid dispenser member, comprising:

a piston; and

a dispensing wall defining an outside surface and inside surface, the wall comprising a dispensing through hole communicating the inside surface to the outside surface;

wherein the inside surface of the wall comprises a leaktight slide cylinder for the piston, the piston moveable in leaktight manner inside the cylinder for selectively unmasking the dispensing orifice;

wherein the piston forms a wall element of a fluid chamber inside which fluid is selectively put under pressure;

wherein the dispensing wall comprises a fluid swirl channel immediately upstream from the dispensing orifice, the fluid swirl channel formed in the inside surface at the slide cylinder;

wherein the dispensing wall is formed by a substantially cylindrical skirt comprising a guide wall defining an inside surface whose inside diameter is greater than the inside diameter of the slide cylinder; and

wherein the slide cylinder, the dispensing orifice and the swirl channel are formed as a one-piece integral construction with the dispensing wall.

17. The fluid dispenser member according to claim 16 , wherein the inside surface of the guide wall is not in leaktight contact with an opposing surface.