Device for dispensing a fluid product and method for priming same

A method for priming a device for dispensing a fluid product, comprising the following steps:

• providing a reservoir which contains at least two doses of fluid product;
• providing a dispenser comprising a pump body containing a dosing chamber, and a dispensing head comprising a dispensing aperture, said dispensing aperture comprising a stopper that is movable and/or deformable between a closed position and an open position, said stopper being resiliently biased towards its closed position and being adapted to open during actuation, said dispensing head being axially movable with respect to said pump body between a rest position and an actuation position, a piston, secured to said dispensing head, being adapted to slide in said dosing chamber between a rest position and an actuation position, said dosing chamber comprising three openings, a first opening connecting said dosing chamber to said reservoir when said piston is in the rest position prior to the first actuation, a second opening connecting said dosing chamber to said dispensing aperture and a third opening provided at the lower axial end of said pump body, said first and third openings being isolated from said dosing chamber when said piston moves out of its rest position,
• said method comprises the step of joining said dispenser to said reservoir, by inserting said pump body in said reservoir with said plunger in the rest position, this insertion moving the fluid product contained in said reservoir, said moved fluid product penetrating inside said dosing chamber through said first opening, to thus prime the device.