Device for dispensing a fluid product

A fluid product dispensing device comprising a reservoir containing a fluid product in an amount of at least one dose, a piston-stopper mounted with the ability to slide in said reservoir in order to dispense the fluid product, a dispensing head, provided with a dispensing orifice, and able to move axially with respect to said reservoir so as to move said piston-stopper in said reservoir in order thus to dispense the fluid product through said dispensing orifice, said piston-stopper comprising a hollow sleeve provided with a central receiving zone arranged in said piston-stopper, a shut-off element being positioned in said central receiving zone in a shutting-off position and being, during actuation, expelled from said shutting-off position towards an open position, wherein said central receiving zone is extended axially on one side by a lower receiving zone comprising at least two wall parts separated by at least two grooves extending axially and radially relative to an axis of the central receiving zone, said wall parts of said lower receiving zone holding said shut-off element in the open position, with the fluid product being able, during actuation, to flow from said reservoir around said shut-off element in the open position via said grooves towards said dispensing orifice;

• wherein said piston-stopper comprises an outer sealing part, formed on the outer periphery of said hollow sleeve, said outer sealing part comprising at least one peripheral bead which provides sealing against an inner side wall of said reservoir;
• and
• wherein said shut-off element, in the shutting-off position, exerts a radial force on said outer sealing part, increasing the interaction between said piston-stopper and said reservoir and therefore the sealing, and during actuation, when said shut-off element is expelled from the shutting-off position, the interaction between said piston-stopper and said reservoir decreases, thus facilitating the movement of said piston-stopper in said reservoir during actuation.

A fluid product dispensing device comprising a reservoir containing a fluid product in an amount of at least one dose, a piston-stopper mounted with the ability to slide in said reservoir in order to dispense the fluid product, a dispensing head, provided with a dispensing orifice, and able to move axially with respect to said reservoir so as to move said piston-stopper in said reservoir in order thus to dispense the fluid product through said dispensing orifice, said piston-stopper comprising a hollow sleeve provided with a central receiving zone arranged in said piston-stopper, a shut-off element being positioned in said central receiving zone in a shutting-off position and being, during actuation, expelled from said shutting-off position towards an open position, wherein said central receiving zone is extended axially on one side by a lower receiving zone comprising at least two wall parts separated by at least two grooves extending axially and radially relative to an axis of the central receiving zone, said wall parts of said lower receiving zone holding said shut-off element in the open position, with the fluid product being able, during actuation, to flow from said reservoir around said shut-off element in the open position via said grooves towards said dispensing orifice;

• and
• wherein said dispensing head includes a dispensing channel that connects an opening tip to said dispensing orifice, said opening tip co-operating with said shut-off element during actuation so as to move said shut-off element from the shutting-off position to the open position, said opening tip including one or more openings at an axial end of said opening tip that enable the fluid product to pass when said opening tip is in contact with said shut-off element when in the open position.