WO2009122035A2

WO2009122035A2 - Method and device for diffusing liquids

Info

Publication number: WO2009122035A2
Application number: PCT/FR2009/000270
Authority: WO
Inventors: Jean-Claude Millet
Original assignee: Osmooze; Millet Innovation
Priority date: 2008-03-13
Filing date: 2009-03-13
Publication date: 2009-10-08
Also published as: FR2928640A1; WO2009122035A3; FR2928640B1

Abstract

The invention relates to a device for diffusing a liquid and a method for manufacturing such a device, the method including the following steps: partially filling a container (1) having an opening (8); mixing polymerizable liquids in a polymer gel; closing the opening and turning the closed container, in such a way that orients the opening downwards, before the end of the polymerization of the mixture, such that a polymer gel cap (3) is formed, closing the opening of the container; and injecting a diffusing liquid (5) into the container by means of a hollow needle (6) passing through the plug.

Description

METHOD AND DEVICE FOR DIFFUSION OF LIQUIDS

The present invention relates to a method and a device for diffusing odors or other active products contained in a liquid, in the air or to a surface to be treated. The present invention applies in particular to the diffusion in the air of active products such as perfumes, essential oils, pheromones, insecticides, insect repellents, etc.

The odor diffusion devices diffuse perfumes either in liquid form or in evaporated form. The diffusion devices in liquid form comprise a vaporization means such as a gas under pressure, or a mechanical vaporizer, with venturi effect, piezoelectric or implementing ultrasound.

Devices that diffuse liquids in evaporated form operate by natural evaporation, or forced evaporation by a stream of air, by heating or by catalysis. But the heat supply can be harmful for some products. The present invention therefore relates more particularly to diffusion devices operating by natural evaporation or forced by an air stream.

There are devices using natural evaporation comprising a wick which quenches partly in the liquid to be dispensed contained in a closed container, a portion of the wick being outside the container. The liquid rises by capillarity in the wick and is thus in contact with the outside air.

There are also devices in which the liquid is contained in a porous material which diffuses the perfume by evaporation as it is exposed to the air. The porous material may include minerals, polymers, plant extracts or more or less complex gels. There are thus adapted tubes for inhaling effective active products to clear the bronchi, or more generally clean the respiratory tract. These devices have the main defect not to broadcast the same product at the beginning of their use and after a certain time of use. Indeed, the products broadcast generally include different molecules with different volatilities. As a result, the most volatile molecules escape first. Moreover, the quantities of product diffused by these devices are not constant. It turns out that the amount of product that vaporizes is greater at the beginning of the diffusion than when the product comes to exhaustion. Devices using a porous material have the disadvantage of having a large volume in which the volume of the porous material is added to the volume of the product to be diffused.

It is therefore desirable to provide a liquid diffusion device by natural or forced evaporation by a stream of air, capable of effecting constant diffusion in quality and quantity.

In one embodiment, there is provided a method of manufacturing a liquid diffusion device. According to one embodiment, the method comprises the steps of: partially filling a container provided with an opening, a mixture of polymerizable liquid in a polymer gel, closing the opening and return the closed container, so as to orient the opening downwards before the end of the polymerization of the mixture, so as to form a first polymer gel stopper closing the opening of the container, and introduce the liquid to be diffused into the container by means of a hollow needle passing through the first cap.

According to one embodiment, the proportions of the liquids forming the mixture are such that at the end of the polymerization of the mixture, residual liquids remain which are retained in a matrix structure resulting from the polymerization. According to one embodiment, the polymer gel comprises a polydimethylsiloxane resulting from the polymerization of a mixture of silicone oils.

According to one embodiment, the method comprises a step of fixing on the container a second plug closing the opening. According to one embodiment, the second plug allows an expansion of the polymer gel beyond the plane of the opening.

According to one embodiment, the container comprises a tubular body and a neck connected to the body by a substantially frustoconical shaped portion. According to one embodiment, the amount of the liquid mixture introduced into the container is such that the volume of polymer gel in the body of the container is greater than or equal to one and a half times the volume of polymer gel in the neck. According to one embodiment, the liquid mixture introduced into the container is such that the height of the polymer gel in the body of the container is greater than or equal to the width of the body of the container.

According to one embodiment, the method comprises a step of evacuating a portion of the air contained in the container, following or during the introduction of the liquid to be diffused into the container.

According to one embodiment, the method comprises a step of introducing air into the container to increase the pressure, following or during the introduction of the liquid to be diffused into the container.

According to one embodiment, the method comprises a step of manufacturing a cannula configured to attach to the opening of the container and to diffuse into a nostril a dose of an active product contained in the liquid.

According to one embodiment, the internal volume of the cannula between the outer surface of the first stopper and the external opening of the cannula corresponds to a dose of the active product.

According to one embodiment, the liquid to be diffused comprises at least one of the elements belonging to the set comprising perfumes, essential oils, pheromones, insecticides, insect repellants, and products having a property. therapeutic, analgesic or cosmetic.

In another embodiment, there is provided a liquid diffusion device comprising a container having an opening and containing the liquid to be diffused. According to one embodiment, the opening of the container is closed by a first plug in a polymer gel which impregnates the liquid to be diffused when it is brought into contact with the liquid, to an outer surface of the first plug where the liquid vaporizes.

According to one embodiment, the polymer gel comprises a polydimethylsiloxane resulting from the polymerization of a mixture of silicone oils. According to one embodiment, the container is closed by a second plug fixed on the opening.

According to one embodiment, the second plug is configured to allow expansion of the polymer gel beyond the plane of the opening. According to one embodiment, the container comprises a tubular body and a neck connected to the body by a substantially frustoconical shaped portion.

According to one embodiment, the volume of polymer gel in the body of the container is greater than or equal to one and a half times the volume of polymer gel in the neck.

According to one embodiment, the height of the polymer gel in the body of the container is greater than or equal to the width of the body of the container.

According to one embodiment, the container contains air at a pressure greater than atmospheric pressure. According to one embodiment, the device is associated with an air ventilation on the outer surface of the first plug.

According to one embodiment, the device comprises a cannula attached to the opening of the container for diffusing the liquid in a nostril.

According to one embodiment, the volume of the cannula between the outer surface of the first stopper and the external opening of the cannula corresponds to a dose of active product contained in liquid to be diffused.

In another embodiment, there is provided a method for diffusing a liquid, comprising steps of installing a liquid diffusion device as defined above, and bringing the liquid into contact with the first plug.

According to one embodiment, the method comprises a step of introducing air into the container using a syringe.

According to one embodiment, the method comprises a step of removing air from the container by means of a syringe. According to one embodiment, the method comprises a step of introducing a liquid to be diffused into the container.

According to one embodiment, the method comprises a step of ventilating the outer surface of the first plug. According to one embodiment, the method comprises a step of applying the first stopper to the skin of a user.

In one embodiment, there is provided a method for diffusing a liquid in the passenger compartment of a vehicle, comprising steps of installing a plurality of broadcasting devices according to that defined above, distributed in the passenger compartment of the vehicle. a vehicle.

According to one embodiment, a diffusion device is installed in a housing provided in an armrest of the passenger compartment of the vehicle.

According to one embodiment, a diffusion device is installed in a housing of the passenger compartment of the vehicle, having an opening opening into the passenger compartment, which can be closed.

Exemplary embodiments of the invention will be described in the following, by way of nonlimiting example, with reference to the appended figures among which:

FIGS. 1A to 1C show, in front view, a device for diffusing a liquid by vaporization according to one embodiment, at different stages of manufacture,

FIG. 2 is a cross-sectional view of a liquid diffusion device equipped with a stopper according to one embodiment,

FIG. 3 is a cross-sectional view of a liquid diffusion device according to another embodiment,

- Figure 4 shows in cross section a diffusion device equipped with a cannula according to one embodiment.

FIGS. 1A to 1C show a device for diffusing a liquid by vaporization according to one embodiment, at different stages of manufacture. The diffusion device comprises a container 1 having an opening 8 formed at one end of a neck 2.

Figure 1A shows the container 1 at a first manufacturing stage. In the first step, the device is partially filled with a mixture of polymerizable liquids in a polymer gel, the liquid mixture being produced in such proportions that at the end of the polymerization, Residual liquids remain which are retained in a matrix structure resulting from the polymerization. In one embodiment, the polymerizable liquids are silicone oils.

Figure 1B shows the container 1 at a second manufacturing step. In the second step, the container is plugged, for example by means of a cap screwed onto the neck 2 or a sheet 4 of an inert material, then turned over so that its opening 8 is oriented downwards. . This operation is carried out before the polymerization is complete, so that the mixture can flow downwards and thus fills the neck 2 and part of the main body of the container. The amount of polymerizable liquids introduced into the container at the first stage is such that the level of the mixture in the container at the second stage exceeds the height of the neck 2.

The polymer mixture is then allowed to polymerize. Thus, in the upper part of the container, a polymer gel plug 3 is formed, closing the opening 8. The gel is thus in intimate contact with the inner face of the container 1, forming a gastight and partially liquid-tight plug. The polymerization that is generally triggered by mixing, can be accelerated by increasing the temperature of the mixture.

Figure 1C shows the container 1 at a third manufacturing step. In the third step, the container is returned. The polymer gel plug is then pierced by means of a hollow needle 6 coupled to a syringe filled with the liquid to be diffused. A quantity of liquid to be diffused 5 is thus introduced into the clogged container 1, and the needle 6 is removed. Due to the plasticity of the polymer gel and the presence of unpolymerized liquid in the gel, the hole formed in the plug 3 by the needle 6 closes instantly as a result of the removal of the needle. The liquid to be diffused 5 is thus enclosed in the container 1. It should be noted that the introduction of the liquid 5 in the container 1 hermetically closed vis-à-vis the gases, causes an overpressure of the air trapped in the container . If it is desired to introduce a larger amount of liquid, the overpressure can be reduced by letting the air in the container exit through the needle 6 or by suctioning it with the aid of the syringe. In a fourth step, the container is turned over again so that the liquid 5 comes into contact with the polymer gel plug 3. During the contacting of the liquid 5 with the plug, the liquid impregnates the plug without flowing (in liquid form) out of the container. It should be noted that this impregnation is forced by the overpressure of the air in the container. It can be observed that as a result of this impregnation, the plug 3 has increased in volume, the liquid to be diffused 5 being attracted by the gel and coming to mix with the uncured polymerizable liquids. The liquid 5 thus diffuses throughout the cap to reach the outer surface thereof where it vaporizes. A flow of liquid 5 thus appears from the inside to the outside of the container 1. This flow is proportional to the evaporation rate of the liquid. The presence of this flow makes it possible to obtain a constant flow in quality and quantity.

It should be noted that fine droplets may form on the outer face of the cap 3. However, the container may be left upside down for long periods because the droplets may appear on the outer face plug 3 are small enough to be retained on the cap 3 without the risk of falling. The liquid can therefore be transferred to a surface such as the skin of a user by a simple contact of the outer face of the cap 3 on the surface. To achieve such contact, it is sufficient to allow the polymer gel to extend slightly towards the outside of the container.

Of course, the container 1 can also be left flipped, the neck down, during the step of introducing the liquid to be diffused. The container 1 may be made of glass or any other material compatible with the liquid to be diffused. The container 1 may have a tubular shape, for example cylindrical. In the illustrated embodiments, it has an opening 8 narrower than the body of the container to prevent inadvertent release of the plug 3 due to excessive overpressure in the container. It should be noted that such an outlet is possible if the thickness of the plug in the body of the container is insufficient.

The polymer gel is obtained for example from a mixture of silicone oils whose respective proportions make it possible to obtain, after polymerization, a silicone gel forming a matrix structure in which residual unpolymerized oils remain. The gel of silicone may comprise a polydimethylsiloxane (PDMS), for example of the Epithelium 26® type marketed by Millet Innovation. The absorption capacity of the silicone gel obtained is such that its volume can be multiplied by a factor of up to 5 to 15 depending on the liquid that impregnates it.

The liquid introduced into the container 1 can be an essential oil or a mixture of essential oils, a fragrance or mixture of perfumes, pure or diluted in a solvent, preferably for the residual oils in the gel 3. The solvent can thus for example include dipropylene glycol dimethyl ether (for example marketed under the tradename Proglyde® by Dow Chemical Co.). The solvent may also include a silicone oil.

The diffusion rate of the liquid in the ambient air can be increased by an increase in the pressure of the air inside the container. This increase in pressure can be achieved by adding air to the container by means of a syringe, or by controlled raising of the temperature of the container. The rate of diffusion of the liquid into the ambient air can also be increased by ventilating the external surface of the plug 3. This ventilation can be obtained by installing the diffusion device in a stream of air, or by suctioning the air at adjacent to the outer surface of the plug 3. The diffusion rate can thus be doubled compared to the flow without ventilation.

When the evaporation surface (surface 9 of the plug 3 in contact with the outside air) is about 75 mm ² , a diffusion of 0.8 to 1.5 mg per hour without ventilation can be observed with essential oils. mint and ylang ylang. This diffusion rate reaches 1.8 to 3.2 mg with ventilation. When the evaporation surface is about 20 mm ² , a diffusion of 0.4 mg per hour of eucalyptus globulus essential oil can be observed. Although the polymer gel plug 3 is partially liquid-tight, there can be provided a cap which can be fixed on the opening 8 of the container 1. FIG. 2 shows the diffusion device equipped with a cap 10 screwed onto a thread formed on the outside face of the neck 2. Such a cap may be provided to protect the polymer gel 3, and / or to prevent the polymer gel from extending excessively outwards of the container, when the latter is placed in contact with the liquid to be diffused. Such a plug may also be used to temporarily prevent the liquid from diffusing into the ambient air, for example during storage periods of the diffusion device containing liquid to be diffused. In one embodiment, the cap 10 comprising an inner annular shoulder 16 allowing the polymer gel to extend beyond the plane of the opening 8 of the neck 2, for example a few tenths of a mm. Thus the outer surface of the cap 3 on which beads of fine drops of liquid 5, can be brought into contact with a surface to be treated as the skin of a user. The friction or the bringing into contact of the projecting portion of the plug 3 on the skin may then be useful for applying a perfume so as to identify the reaction on the olfactory plane, or to apply an active product to a small lesion such as, for example, a sting. . The liquid 5 can thus comprise active products, natural or otherwise, having therapeutic, analgesic or cosmetic properties.

Figure 3 shows another embodiment of the diffusion device. In Figure 3, the device comprises a container 1a having a neck 2a defining the opening 8 of the container. After having formed the polymer gel plug 3 and introduced the liquid to be diffused into the container, as illustrated by FIGS. 1A to 1C, a capsule 10a can be fixed on the opening 8 of the container 1a, for example by crimping, so as to to wrap the collar 2a. The capsule 10a may comprise a central portion detachable so as to form a central opening 11 venting part of the polymer gel plug 3. In one embodiment illustrated in FIG. 3, the neck of the container 1a has a part 7 of frustoconical inner shape or rounded shoulder, the neck having a larger diameter at its base than the opening 8 of the container. Thus, when the stopper 3 is filled with liquid to diffuse, the cap 3 exerts by its expansion forces on the inner face of the neck. Given the particular shape of the neck, the forces exerted on the inner face of the neck have an axial component oriented towards the bottom of the container. As a result, the plug tends to extend into the interior of the container. Depending on the expansion factor of the cap 3 which varies depending on the liquid that impregnates, the cap can go up out of the neck to the bottom of the container. This movement do not affect the tightness of the closure of the container if the cap 3 has been made to be in contact with the main body of the container to a sufficient height. This movement towards the interior of the container has the additional interest of generating a slight excess pressure inside the container which promotes the diffusion of the liquid. Moreover, as the liquid is diffused, the plug 3 moves towards the bottom of the container as a function of the equilibrium point between the pressure inside the container, the atmospheric pressure, and the axial and radial forces exerted by the cap on the inner face of the container (as long as the cap is in contact with the neck.

In one embodiment, the amount of polymer gel 3 introduced into the container 1 is chosen according to one and / or the other of two criteria. According to the first criterion, the thickness of the polymer gel in the container body must be sufficient so that the closure of the container by the polymer gel is gastight. This sealing is ensured if the thickness of the polymer gel (not yet impregnated with liquid to be diffused) in the body of the container is at least equal to the width of the container (the radius of the container if the body of the container is cylindrical). According to the second criterion, the volume of polymer gel contained in the body of the container is at least equal to that contained in the neck. Thus, under the effect of the overpressure in the container, the portion of the cap of 3 in the body of the container can not pass through the neck by deforming. In one embodiment, the volume of polymer gel in the body of the container is of the order of 1.5 times the volume of polymer gel (not yet impregnated with liquid to diffuse) in the neck. The container must be returned from time to time to impregnate the cap 3 of the liquid to be diffused 5, and thus maintain the diffusion flux of the active product in the liquid 5. Of course, when all the liquid 5 contained in the container 1 has been vaporized, the container can be filled again with a liquid to be diffused by means of a syringe. In many applications, the contacting of the liquid 5 with the stopper 3 results from the use of the device, and therefore does not require a voluntary gesture. This is the case in all mobile applications in which the container is shaken naturally or is not necessarily in a vertical position, the neck upwards. Moreover, it should be noted that, even if the bottle is not returned regularly, its Liquid diffusion function would not be affected even in the long run. Indeed, the uncrosslinked oils are very little volatile, and therefore are always present in the matrix of the plug 3 and therefore on its surface.

In some applications, such as most ventilation applications, the flipping of the container is not necessary since it is the normal operating configuration.

The diffusion device according to the invention can be used to present a sample of perfumes or essential oils. For this purpose, the container may be in the form of a small bottle sealed in a sealed manner for example by means of a screw cap. The user accesses the olfactory dimension of the diffused liquid by opening the bottle and approaching it from its nose. Thus, the device can have an autonomy of several months. This type of bottle can also be used for fun or gaming purposes. The diffusion device can also be used to treat small volumes such as that of a bathroom or a passenger compartment. The evaporation surface is then adapted to the volume to be treated and the diffused product. The diffusion device can then be associated with a ventilation device. The diffusion device can also be used to diffuse pheromones. For this purpose, it can be in the form of a small bottle embedded in an animal collar.

FIG. 4 represents a diffusion device according to one embodiment, adapted to be used for the care of the respiratory tracts by diffusing nasally an active product. For this purpose, the container 1 can be configured to allow the attachment of a cannula 12 adapted to be introduced into a nostril. The cannula 12 may be closed by an outer plug 14 outside each socket. When the opening of the cannula is closed, the volume in the cannula between the outer surface 9 of the polymeric gel plug 3 and the plug 14 of the cannula tends to be loaded with active product. Volume 14 can be adapted to correspond to a dose of active product, given the time between two successive shots. The active product may for example comprise eucalyptus extracts or a synthetic molecule having an equivalent effect.

The previously described broadcasting device can also be used to treat an enclosed space such as the passenger compartment of a vehicle. In In particular, the car industry has for many years been fighting for the olfactory neutrality of new vehicles. The odors that can be perceived in a new vehicle come from the molecules emitted in infinitesimal quantities by the different materials constituting the cabin. Usually these odors are treated by installing a perfume diffusion device in the passenger compartment, and in particular in the ventilation circuit. As a result, the concentration of diffused perfume, and thus the olfactory perception is not identical depending on whether one is near the perfume source or at a greater distance from it. In one embodiment, it is intended to distribute in the passenger compartment of a vehicle, several diffusion devices in the form of small bottles such as the bottle 1 or 1a, each bottle continuously diffusing a very small amount of perfume or odor-destroying molecules. Flasks can thus for example be arranged in a space provided for this purpose in each of the armrests.

It may also be desirable to be able to broadcast on demand a perfume in the passenger compartment of a vehicle. In this case, a bottle such as the bottle 1 or 1a, can be installed in a housing with a closure, such as an ashtray, so that it can be opened or closed according to the needs of the user.

It should be noted that the perfume is brought into contact with the polymer gel stopper naturally by the vibrations of the vehicle when it moves. The bottles can also be installed in the vehicle, their opening facing downwards. It will be apparent to those skilled in the art that the present invention is susceptible to various embodiments and applications. In particular, the invention is not limited to a closed container or capable of being closed by a second stopper fixed on the opening of the container. Likewise, it is not necessary for the container to be closed by such a second plug during the expansion of the first polymer gel plug. Indeed, it may be desirable to allow the polymer gel to extend partially to the outside of the container. In addition, the expansion of the polymer gel towards the outside of the container may be prevented by any other means, for example by applying the thumb to the opening of the container. The invention is also not limited to a cylindrical container with a neck, nor to a container whose opening is narrower than the container body. The polymer gel plug can indeed be maintained in the container if the balance of the inner and outer pressures of the container during the filling of the container and during the contacting of the liquid to be diffused with the polymer gel is maintained.

Claims

1. A method of manufacturing a device for dispensing a liquid, characterized in that it comprises the steps of: partially filling a container (1, 1a) provided with an opening (8), a mixture of polymerizable liquids into a polymer gel, closing the opening and returning the closed container, so as to orient the opening downward before the end of the polymerization of the mixture, so as to form a first polymer gel plug (3) closing the opening of the container, and introducing the liquid to be diffused (5) into the container by means of a hollow needle (6) passing through the first plug.

2. The manufacturing method according to claim 1, wherein the proportions of the liquids forming the mixture are such that at the end of the polymerization of the mixture, there remain remaining liquids which are retained in a matrix structure resulting from the polymerization.

3. The manufacturing method according to one of claims 1 and 2, wherein the polymer gel comprises a polydimethylsiloxane resulting from the polymerization of a mixture of silicone oils.

4. Manufacturing process according to one of claims 1 to 3, comprising a step of fixing on the container (1a) of a second plug (10, 10a) closing the opening (8).

5. The manufacturing method according to claim 4, wherein the second plug (10) allows an expansion of the polymer gel beyond the plane of the opening (8).

6. Manufacturing process according to one of claims 1 to 5, wherein the container (1, 1a) comprises a tubular body and a neck (2) connected to the body by a substantially frustoconical shaped portion (7).

7. The manufacturing method according to claim 6, wherein the amount of the liquid mixture introduced into the container (1, 1a) is such that the volume of polymer gel in the container body is greater than or equal to one and a half times the volume. of polymer gel in the neck (2).

8. Manufacturing process according to one of claims 1 to 7, wherein the liquid mixture introduced into the container (1, 1a) is such that the height of the polymer gel in the container body is greater than or equal to the width of the container. body of the container.

9. The manufacturing method according to one of claims 1 to 8, comprising a step of discharging a portion of the air contained in the container (1, 1a), after or during the introduction of the liquid to spread in the container.

10. The manufacturing method according to one of claims 1 to 9, comprising a step of introducing air into the container (1, 1a) to increase the pressure, after or during the introduction of the liquid to be diffused. (5) in the container.

11. Manufacturing method according to one of claims 1 to 10, comprising a step of manufacturing a cannula (12) configured to attach to the opening (8) of the container (1) and to diffuse into a nostril a dose of an active product contained in the liquid (5).

12. The manufacturing method according to claim 11, wherein the internal volume (15) of the cannula (12) between the outer surface (9) of the first plug (3) and the external opening of the cannula corresponds to a dose of active product.

13. The manufacturing method according to one of claims 1 to 12, wherein the liquid to be diffused comprises at least one of the elements belonging to the set comprising perfumes, essential oils, pheromones, insecticides, products. insect repellents, and products having a therapeutic, analgesic or cosmetic property.

Liquid diffusion device, comprising a container (1, 1a) having an opening (8) and containing the liquid to be diffused (5), characterized in that the opening (8) of the container is closed by a first cap (3) in a polymer gel which impregnates the liquid to be diffused (5) when it is brought into contact with the liquid, to an outer surface (9) of the first plug where the liquid vaporizes.

The device of claim 14, wherein the polymeric gel comprises a polydimethylsiloxane resulting from the polymerization of a mixture of silicone oils.

16. Device according to claim 14 or 15, wherein the container (1a) is closed by a second plug (10, 10a) fixed on the opening (8).

17. Device according to one of claims 14 to 16, wherein the second plug (10) is configured to allow expansion of the polymer gel (3) beyond the plane of the opening (8).

18. Device according to one of claims 14 to 17, wherein the container (1, 1a) comprises a tubular body and a neck (2) connected to the body by a substantially frustoconical portion (7).

19. Device according to claim 18, wherein the volume of polymer gel in the body of the container (1, 1a) is greater than or equal to one and a half times the volume of polymer gel in the neck (2).

20. Device according to one of claims 14 to 19, wherein the height of the polymer gel in the body of the container (1, 1a) is greater than or equal to the width of the body of the container.

21. Device according to one of claims 14 to 20, wherein the container (1, 1a) contains air at a pressure greater than atmospheric pressure.

22. Device according to one of claims 14 to 21, associated with an air ventilation on the outer surface (9) of the first plug (3).

23. Device according to one of claims 14 to 21, comprising a cannula (12) fixed on the opening (8) of the container (1) for diffusing the liquid (5) in a nostril.

24. Device according to claim 23, wherein the volume (15) of the cannula (12) between the outer surface (9) of the first plug (3) and the external opening of the cannula corresponds to a dose of active product content in liquid to be diffused (5).

25. Device according to one of claims 14 to 23, wherein the liquid to be diffused comprises at least one of the elements belonging to the set comprising perfumes, essential oils, pheromones, insecticides, insect repellents and the like. insects, and products having a therapeutic, analgesic or cosmetic property.

26. A method of diffusing a liquid, characterized in that it comprises steps of installation of a liquid diffusion device, according to one of claims 14 to 25, and of contacting the liquid ( 5) with the first plug (3).

27. The diffusion method according to claim 26, comprising a step of introducing air into the container (1, 1a) using a syringe.

28. The diffusion method according to claim 26, comprising a step of removing air from the container (1, 1a) by means of a syringe.

29. The diffusion method according to one of claims 26 to 28, comprising a step of introducing a liquid to diffuse (5) in the container (1, 1a).

30. The diffusion method according to one of claims 26 to 29, comprising a step of venting the outer surface (9) of the first plug (3).

31. The method of diffusion according to one of claims 26 to 29, comprising a step of applying the first plug (3) on the skin of a user.

32. A method of diffusing a liquid in the passenger compartment of a vehicle, characterized in that it comprises steps of installing several broadcasting devices according to one of claims 14 to 25, distributed in the interior of a vehicle.

33. The method of claim 32, wherein a diffusion device is installed in a housing provided in an armrest of the passenger compartment of the vehicle.

34. The method of claim 32 or 33, wherein a diffusion device is installed in a housing of the passenger compartment, having an opening opening into the passenger compartment, which can be closed.