Dispensing – With filter – Associated with vent passage
Patent
1995-09-13
1996-10-29
Kashnikow, Andres
Dispensing
With filter
Associated with vent passage
222365, 222636, 239307, 406132, 12820313, B67D 558
Patent
active
055688845
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a portable device for projecting measured quantities of a fluid substance by means of a puff of compressed air.
The intended fluid substances are particularly powders, but also possibly liquids.
The present invention is particularly applicable to the field of sprays for projecting doses of a pharmaceutical substance in powder form onto the mucous membranes of the respiratory tract (by mouth or by nose). Such sprays use an effect whereby the powder is projected onto the mucous membrane, unlike inhalers for sending powder into the bronchi, where the powder is transported by the flow of air inhaled by the patient on breathing.
It is known to use aerosol sprays for this purpose. The powder is contained in a tank with a liquefied propellant gas, and a valve triggers expulsion of the powder in suspension in the liquefied gas. On expanding at atmospheric pressure, the liquefied gas returns to the gaseous state and expands very greatly, thereby propelling the powder.
However, aerosols suffer from the drawback of using propellant gases that are generous either for the environment (freons) or else for users (hydrocarbons). Also, before expelling powder, they require the tank to be properly shaken in order to put the powder into suspension in the liquefied gas. If a user forgets to shake the tank, or shakes it insufficiently, then the expelled dose of powder is inaccurate.
An object of the present invention is to remedy those drawbacks.
The present invention provides a device for projecting measured quantities of a fluid substance by means of a puff of compressed air, said device comprising:
a body having an ejection channel;
an actuator member displaceable relative to the body between a rest position and an actuated position;
a resilient return member for the actuator member, urging the actuator member towards its rest position;
a supply of said substance;
feed means adapted to displace a measured quantity of said substance from the supply into the ejection channel when the actuator member is displaced from its rest position to its actuated position; and
an air pump having a pump chamber provided with a displaceable wall secured to the actuator member and adapted to compress the pump chamber when the actuator member is displaced from its rest position to its actuated position, said pump chamber having an inlet valve which communicates with the atmosphere, and an outlet valve which communicatees with the ejection channel, the outlet valve being constituted by a shutter member which co-operates with an outlet opening, said shutter member isolating the outlet opening from the pump chamber so long as the actuator member is not in the immediate vicinity of its actuated position, said shutter member opening communication between the pump chamber and the outlet opening when the actuator member is in the immediate vicinity of its actuated position;
the device being characterized in that the outlet valve is constituted by a valve piston constrained to move with the actuator member and sliding in sealed manner in a valve cylinder having a top end, said cylinder having a lateral outlet orifice which communicates with the ejection channel, said valve cylinder having its top end in communication with the pump chamber, said lateral outlet orifice being positioned sufficiently far from said top end of the valve cylinder for the valve piston to isolate the lateral outlet orifice from the pump chamber so long as the actuator member is not in the immediate vicinity of its actuated position.
In an embodiment of the invention, the valve cylinder may possess a vent orifice positioned in such a manner that said lateral outlet orifice is disposed between said vent orifice and said top end of the valve cylinder which is in communication with the pump chamber. In this case, said vent orifice may optionally be provided with a filter to prevent dust penetrating into the valve cylinder.
According to another characteristic of the invention, the feed means are constituted by a feed rod having a measuring recess a
REFERENCES:
patent: 2581182 (1952-01-01), Fields
patent: 2587215 (1952-02-01), Priestly
patent: 4524769 (1985-06-01), Wetterlin
patent: 5033463 (1991-07-01), Cocozza
patent: 5113855 (1992-05-01), Newhouse
patent: 5239992 (1993-08-01), Bougamount et al.
patent: 5447151 (1995-09-01), Bruna et al.
Dergkshani Philippe
Kashnikow Andres
Valois S.A.
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