A dosing nozzle is intended to be fitted onto a container containing a product. The nozzle comprises a dosing cavity which can move between a first position and a second position in which it occupies a minimum volume, the cavity being delimited by first and second pistons capable of sliding inside a fixed body. The first piston is fixed to a closure member capable, selectively, of closing off/exposing at least one outlet of the dosing cavity. During a first phase of the movement of the dosing cavity, the first piston is driven by through the effect of the pressure of the product being exerted on the second piston and, during a second phase of the movement of the dosing cavity, the first piston is driven by the pressure of the product being exerted on the first piston, the second piston being immobilized in translation during this second phase.

The invention describes a squeeze bottle for dispensing a liquid, in particular a liquid medicament, in a metered and substantially germ-free manner, at least comprising: a storage chamber for accommodating the liquid, a metering chamber with a variable volume for dispending from this chamber, under reduction of volume of the chamber, a measured volume of liquid, restoring means for returning the metering chamber to its original state after a volume of liquid has been dispensed, an inlet for placing the metering chamber in communication with the storage chamber by mediation of a flow restrictor, which flow restrictor counteracts flow from the metering chamber to the storage chamber substantially completely when the pressure in the storage chamber is increased, counteracts flow between the storage chamber and the metering chamber substantially completely and , when the increase pressure in the storage chamber is removed, allows flow from the storage chamber into the metering chamber, at least one outflow opening for placing the interior of the metering chamber in communication with the environment, the outflow opening comprising a non-return valve, actuating means can be actuated by squeezing the bottle, means for ventilating the squeeze bottle.

A device (2) for fitting to the neck of a deformable bottle (4) to give a metered dose of liquid when the bottle is squeezed. The liquid dispensed through outlet (30) has to pass through a metering chamber (34) in which it is directed around or through a freely-moving shuttle (8), movement of the shuttle (8) with the flow being resisted by the creation of a partial vacuum in the expanding control chamber (42) behind the shuttle, so that the rate at which the shuttle moves to the outlet end of the metering chamber (34) to close the outlet (30), and hence the amount of liquid dispensed, is controlled by the rate at which liquid can enter control chamber (42). Because it is configured so that all the liquid enters metering chamber (34) at its inward end, the chamber may fitted either inside or outside the neck of the bottle (4) and the dose may be adjusted by moving the outlet (30) closer to, or further from, the inlet.