Patent ID: 8066153

Claim:
A fluid dispenser device comprising: a reservoir (R) of variable working volume comprising a sealing slide-cylinder ( 100 ) and a follower piston ( 2 ) that is in sliding sealing contact in said cylinder; dispenser means ( 3 ) that are suitable for putting the fluid stored in the reservoir under pressure in such a manner as to drive a fraction of the fluid through a dispenser orifice ( 37 ), and under suction in such a manner as to move the follower piston in the direction that decreases the working volume of the reservoir; and non-return means that are suitable for preventing any substantial movement of the follower piston in the direction that increases the working volume of the reservoir; the device being characterized in that the non-return means include at least one chamber (C) of variable volume that is filled with fluid from the reservoir during the suction stage.