Dispensing – With discharge assistant – With movable nozzle interconnected therewith
Patent
1995-11-21
1997-11-18
Kaufman, Joseph
Dispensing
With discharge assistant
With movable nozzle interconnected therewith
222341, 222494, G01F 1106
Patent
active
056878842
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a metering device and more particularly to a device making it possible to meter out and deliver a predetermined quantity of a fluid without the intervention of a propellant gas. The new metering device can be used in all positions, and can be fitted to containers of various shapes.
In many fields, it is often necessary to be able to deliver precise metered amounts of fluids or liquids contained in a receptacle designed for this purpose, and in the pharmaceutical field in particular it is indispensable for the metered amounts delivered by the device to be both precise and constant, that is to say that the device has to deliver a predetermined metered amount, and this metered amount must remain identical, even after a relatively large number of uses.
Furthermore, in order to improve reliability of the metering device, and to make it easier to manufacture, it is desirable for it to include the smallest possible number of constituent parts.
2. Discussion of the Background
The metering devices currently in use in the state of the art often include a large number of parts, such as checkvalves, springs, plungers, stoppers, and etc. In addition, the metering devices have to exhibit good sealing to prevent air or water from entering the inside of the receptacle and damaging the product or composition which it contains, and as a general rule this sealing may be obtained satisfactorily only by adding additional elements such as rings, collars, filters or seals.
Thus, for example, Patent EP-A-0,395,754 describes a metering device designed for products of relatively high viscosity, such as cosmetic creams. This metering device consists of a stopper screwed onto the threaded outlet of a cylindrical receptacle comprising a variable-volume expansion chamber communicating with the inside of the receptacle via a valve and a pipe.
Patent FR-A-2,676,714 relates to a receptacle containing a fluid product to be dispensed, equipped with a device intended to protect the product contained in the receptacle after use, and providing a sealed closure without it being necessary to close off the outlet duct for the product using a cap. In one embodiment, the receptacle is a pressurized container equipped with a valve. Actuation of the valve causes fluid to flow which pushes back an elastic membrane including a needle valve surrounded by openings via which the product may flow out. When the valve is released, suction returns the membrane against its support such that the needle valve closes off the outlet orifice.
Such device affords good ease of use, but cannot reliably and repetitively dispense a predetermined metered amount of product.
Patent US-A-4,376,495 describes a device designed to provide an adjustable metered amount of a fluid contained in a flexible receptacle, comprising a hollow piston moving in the neck of the receptacle, combined with a valve allowing the fluid to pass.
Patent FR-A-2,674,024 describes a simple metering device comprising a relatively small number of constituent parts. The main element of this metering device essentially consists of a stopper containing an elastic deformable part pierced at its center with an orifice which is partially closed by a check valve, and including on its edge a tubular portion fitted to a lid made of a rigid material. This device is suitable for fluids which can be used especially in cosmetics, but is not appropriate for pharmaceutical products owing to the lack of precision in the metered amount delivered, and to the lack of sealing of the device as a whole.
The situation is that, in the field of pharmaceutical products, the conditions of precision and constancy of the metered amount delivered are essential and absolutely must be complied with, with a very small margin of error, without detracting from the ease of use. In addition, the sealing of the metering receptacle must be perfect, to preclude any risk of the primed state being lost, and also to ensure that the product to be dispensed, i
REFERENCES:
patent: 4685594 (1987-08-01), Czech
patent: 5033647 (1991-07-01), Smith et al.
patent: 5154325 (1992-10-01), Ryder et al.
patent: 5267673 (1993-12-01), Crosnier et al.
patent: 5447258 (1995-09-01), Suzuki
Bodin Jacques
Taberlet Jean-Philippe
Kaufman Joseph
Labcatal (societe anonyme)
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