Abstract:
A liquid-dispensing device including a cap for protecting a liquid-dispensing opening, the protective cap being provided with a pad for absorbing residual liquid, made of an absorbent material, the absorbent pad being fastened to a support made of a more resistant material than the absorbent pad, the support being furthermore fastened in the protective cap.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to the technical field of liquid dispensing. In particular, but not exclusively, it relates to the field of the dispensing of liquid in the form of drops or in the form of spray, such as ophthalmic, nasal, buccal or auricular liquid. 
       BACKGROUND OF THE INVENTION 
       [0002]    From the prior art, for example from the document FR 2 988 015, a liquid-dispensing device is known that comprises a flask, a dispensing end piece provided with a liquid-dispensing opening and a removable cap protecting this opening. The protective cap comprises an absorption pad, made in such a way that residual liquid is absorbed by the pad, thus making it possible to limit the subsequent administration of contaminated residual liquid. 
         [0003]    It has been found that, during the process of mounting the absorption pad inside the protective cap, particles originating from the pad can be generated, notably by friction occurring during the manipulation of the pad on the protective cap. Now, these particles can be the source of product contamination, or even of the administration of particles to the eye. Furthermore, these particles are likely to build up in different parts of the device, for example by being deposited on the absorption pad, inside the device, with the risk of creating a malfunction of a non-return valve, or even in a device assembly white room, a room in which the rate of particles present inside is the subject of regulations and controls. 
       SUMMARY OF THE INVENTION 
       [0004]    The aim of the present invention is notably to provide a liquid-dispensing device that further prevents the contamination of the product dispensed. 
         [0005]    To this end, the subject of the invention is a liquid-dispensing device comprising a protective cap for a liquid-dispensing opening, the protective cap being provided with a residual liquid absorption pad, made of an absorbent material, the absorption pad being fixed onto a support made of a stronger material than the absorption pad, this support being also fixed in the protective cap. 
         [0006]    Thus, the absorption pad is fixed onto the protective cap via the support. It is proposed to fix the pad onto a support, which makes it possible to reduce, even totally limit, the generation of particles which could occur when mounting the pad in the protective cap. In effect, since the pad is generally made of a relatively brittle material, the fact that it is fixed onto a support rather than directly onto the protective cap means that, in the case where particles might be generated when fixing the absorption pad in the support, these particles can then be removed, and are not jammed inside the protective cap. Moreover, since the support is made of a stronger material than the absorption pad, the forces which are exerted by the protective cap on the absorption pad during assembly are applied to the support, which generates fewer particles, because there is no longer, or almost no longer, friction between the absorption pad and the protective cap during assembly. Consequently, a device is obtained which limits the quantity of particles likely to contaminate the product to be administered and which reduces the risk of accidentally administering particles into the eye that can be harmful, objectionable and/or that makes it possible to observe certain regulatory constraints. 
         [0007]    It will therefore be understood that the lateral edge of the absorption pad is spaced apart from centering outlines of the absorption pad in the protective cap, so that the contacts and/or friction are avoided between the absorption pad and the centering outlines, therefore between the absorption pad and the protective cap. There is therefore little or no formation of particles when adding the support provided with the absorption pad into the protective cap. 
         [0008]    The spacing means for the lateral edge of the absorption pad are borne by the support, for example by the lateral walls of the support. 
         [0009]    “Materials stronger than the absorption pad” should be understood to mean a material that is more cohesive than that of the absorption pad, that is to say that the forces of interaction within the substance of the support are stronger than those within the substance of the absorption pad, in particular the forces of electromagnetic interaction. Since the support is made of a stronger material, it exhibits reduced brittleness and increased resistance to friction, and therefore makes it possible to limit the generation of particles. For example, the support is made of plastic material such as polyethylene (PE), and the absorption pad is made of a material comprising at least one hydrophilic part, making it possible to drain liquid, that is to say capable of absorbing liquid, even of allowing it to evaporate if an evaporation path is open. 
         [0010]    The device presented above can further comprise one or more of the following features, taken alone or in combination. 
         [0011]    The support is made of plastic material, such as polyethylene. The plastic material offers a better resistance to the support than to the absorption pad, so as to limit the generation of particles under the effect of friction which could occur during mounting. 
         [0012]    The support has an annular form. This annular form makes it possible to limit the friction over the entire perimeter of the absorption pad. 
         [0013]    The support extends over the entire height of the absorption pad. This thus makes it possible to restrict or eliminate any part of the absorption pad in contact with the protective cap. 
         [0014]    The residual liquid absorption pad is fixed onto the support by overmolding. The overmolding of the absorption pad on the support or of the support on the absorption pad offers the advantage of not generating any particles during assembly, and further makes it possible to ensure unicity in the assembly comprising the support and the absorption pad, to allow for a better cohesion between these two parts. 
         [0015]    The absorption pad is fixed onto the support, by clamping, snap-fitting, bonding or placed on the support in such a way that the absorption pad is held on the support. Such an assembly is particularly simple to implement. 
         [0016]    The absorption pad is made of a porous material. Thus, the porous material makes it possible to have satisfactory absorption properties, in particular hydrophilic properties, useful for the absorption of the residual liquid by the absorption pad, so as to obtain an almost complete or complete absorption of the residual liquid by the pad. Furthermore, it can allow protection against any microbial contaminations by virtue of the absorption, draining and drying of the residual liquid due to the porous nature of the material. 
         [0017]    The absorption pad comprises woven or unwoven materials. It can for example comprise hydrophilic cotton, polyethylene (PE) that has undergone a hydrophilic treatment, polyethylene terephthalate (PET) that has undergone a hydrophilic treatment, a poly(vinyl acetate) (PVA) foam or even a mixture of a number of hydrophilic materials. 
         [0018]    The absorption pad is made of a material comprising ethylene vinyl acetate (EVA). The use of this material to produce the absorption pad is particularly advantageous because it makes it possible to limit the formation of particles. In effect, the structure of the EVA, in foam form, has a better cohesion than that of the absorption pad, while maintaining the absorbent properties thereof. 
         [0019]    The absorption pad is a multilayer pad. The layers are preferably stacked axially on top of one another. In particular, the absorption pad can comprise at least two distinct absorbent materials, arranged one on top of the other, the downstream material being more hydrophilic than the upstream material. Thus, the liquid is sucked up by the more hydrophilic material and the residual liquid does not stagnate in the less hydrophilic material arranged in proximity to the dispensing opening. The residual drop is thus entirely absorbed by virtue of the proximity of the absorption pad. The upstream material advantageously comprises a hydrophobic material. It therefore prevents the liquid absorbed by the more hydrophilic material from returning to the dispensing opening. The absorption pad can further comprise, on at least one of its layers, an antimicrobial agent which can be of disinfectant or bacteriostatic type. The advantage of such an absorption pad is a very great microbial efficiency, without this microbial agent coming into contact with the liquid delivered. 
         [0020]    The surface area of the absorption pad in contact with the air can be increased, notably to speed up the rate of drying of the pad, in particular when a low-absorption pad is used. 
         [0021]    The absorption pad is kept immobile between two axial abutments of the support cooperating with the absorption pad. The absorption pad is immobilized by axial pinching between the axial abutments of the support. The risk of friction between the absorption pad and the support is thus reduced. 
         [0022]    The support comprises two parts fitted into one another, each part defining an axial abutment. This embodiment is simple to implement. 
         [0023]    The support is fixed in the protective cap by mechanical assembly, for example by clamping or by snap-fitting, possibly via one or more reliefs or hollows, continuous or not, such as a ridge or a stud, formed on the protective cap and/or the support. Thus, after insertion of the support by forcing it into the protective cap and elastic deformation of the support on passing the relief or reliefs, the relief and/or the hollow can form a mechanical abutment of the support in the protective cap. It is also possible to provide a relief of different geometry capable of exerting a function of blocking of the support relative to the protective cap. It is also possible to glue the support in the protective cap. Thus, the assembly will be able to be handled and assembled with other parts while minimizing any possible disassembly of the protective cap and of the support on which the absorption pad is fixed. 
         [0024]    The device comprises a residual liquid expulsion form situated in the immediate vicinity of and facing the dispensing opening and borne by the protective cap or the support, when the protective cap is mounted on the device. The expulsion form expels most of the residual liquid present downstream of the dispensing opening, notably toward the residual liquid absorption pad arranged in proximity, that is to say that the residual liquid is discharged toward the absorption pad. It will therefore be understood that the absorption pad is arranged downstream of the dispensing opening. Thus, a draining of most of the residual liquid out of the dispensing opening is produced. The expulsion or discharging of residual liquid in the vicinity of the dispensing opening avoids the development of bacteria in this zone, which is particularly advantageous when the liquid dispensed does not include any conserving agents. 
         [0025]    The device can take, when the protective cap is mounted on the device, a configuration of hermetic closure of the device, before its first use, in which the residual liquid evaporation path is closed between the absorption pad and the outside of the device, and a configuration of ventilation of the device, in which the evaporation path is open between the absorption pad and the outside. 
         [0026]    The device comprises a residual liquid evaporation path between the absorption pad and the outside of the device when the protective cap is mounted on the device, the protective cap comprising an outer casing and an inner casing, mounted mobile relative to one another between a first configuration, corresponding to a configuration of hermetic closure of the device, and a second configuration corresponding to a configuration of ventilation of the device, in which the evaporation path is open between the absorption pad and the outside. Thus, the protective cap allows a ventilation as described in the document FR 2 988 015, so that the residual liquid absorbed by the absorption pad can be evaporated out of the device. 
         [0027]    The protective cap comprises air passage orifices and a seal closing the residual liquid evaporation path before the first use. The seal is removable, preferably disposable, and is added onto the protective cap. Upon first use, the user removes the seal from the device which passes from the configuration of hermetic closure to the configuration of ventilation. 
         [0028]    Also a subject of the present invention is a method for assembling a device as presented previously, during which the absorption pad and the support are first of all assembled, then the assembly is added into the protective cap, the method preferably further comprising a step of blowing of compressed air over the assembly of the absorption pad and the support, before they are added into the protective cap. With the absorption pad being previously assembled with the support separately, the generation of particles in the device is thus minimized. Furthermore, the generation of particles in the device is also minimized when the absorption pad and support assembly is assembled on the protective cap. Finally, the optional additional blowing step advantageously makes it possible to eliminate any particle which might have been generated. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0029]    The invention will be better understood on reading the attached figures, which are supplied as examples and are in no way limiting, in which: 
           [0030]      FIG. 1  is a longitudinal cross-sectional view of a dispensing device according to a first embodiment; 
           [0031]      FIG. 2  is an exploded perspective view of the interior of the inner casing of the protective cap, of the absorption pad and of the support, of the device of  FIG. 1 ; 
           [0032]      FIG. 3  is a view similar to  FIG. 1  of a device according to a second embodiment; 
           [0033]      FIG. 4  is an exploded perspective view of the interior of the inner casing of the protective cap, of the absorption pad and of the support, of the device of  FIG. 3 ; 
           [0034]      FIG. 5  is a view similar to  FIG. 1  of a device according to a third embodiment in the ventilation configuration; 
           [0035]      FIGS. 6 to 13 and 15  are views similar to  FIG. 1  of a device according to other embodiments; 
           [0036]      FIG. 14  is a cross-sectional view illustrating the method of assembling the pad, the support and the protective cap of the embodiment presented in  FIG. 13 ; 
           [0037]      FIG. 16  is a perspective view of the device of  FIG. 15  in the hermetic closure configuration. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0038]      FIGS. 1 and 2  show a first embodiment of a liquid-dispensing device  10 . The device  10  is similar to that described in the publication FR 2 988 015. The device  10  is, in  FIG. 1 , in the hermetic closure configuration. In this non-limiting example, the device  10  is a device for dispensing liquid in drop form. 
         [0039]    The device  10  comprises a protective cap  12  and a dispensing end piece  14  which is intended to be mounted on the neck of a tank (not represented), for example by screwing. This tank is a liquid storage tank, for example for storing pharmaceutical liquid such as ophthalmic liquid. The tank is deformable, so as to dispense the liquid by pressure, on the part of a user, on the body of the tank, the latter being able to exhibit a certain elasticity to resume its initial form after the pressure exerted by the user, which generates low pressure in the tank. 
         [0040]    The dispensing end piece  14  comprises a membrane  18 , or valve  18 , forming a non-return valve, a valve support  26  and a top casing  24 . The valve  18  delimits, with the valve support  26 , a channel  20  for dispensing liquid from the tank. This channel  20  emerges on a flared part, forming drop formation means  34 , produced in the valve  18  for the formation of drops, defining a liquid-dispensing opening  22 . The valve  18  is configured in such a way as to be able to assume a configuration of passage of liquid, during which liquid can reach the dispensing opening  22 , and a configuration of blocking of the liquid, during which the valve  18  is pressed against the top end of the valve support  26 , thus blocking the passage of liquid. 
         [0041]    There now follows a description of the protective cap  12 , mounted on the dispensing end piece  14 , preferably by screwing. The protective cap  12  comprises, in this example, an outer casing  28  and an inner casing  30 . These inner and outer casings  30 ,  28  are coaxial, secured to one another while being mounted mobile relative to one another in rotation and in longitudinal translation, between a first configuration, corresponding to a configuration of hermetic closure of the device  10 , visible in  FIG. 1 , and a second configuration corresponding to a configuration of ventilation of the device  10 . As illustrated in  FIG. 5 , in the ventilation configuration, an evaporation path  48  is open between the absorption pad  36  described hereinbelow and the outside of the device  10 , such that residual liquid absorbed by this absorption pad  36  can evaporate. The inner casing  30  further comprises a residual liquid expulsion form  32  which would be located in or in the vicinity of the dispensing opening  22 . This expulsion form  32  is situated in the immediate vicinity of and facing the dispensing opening  22 . 
         [0042]    The expulsion form  32  is also, in this example, a form for immobilizing the valve  18  in the position of blocking of the liquid when the protective cap  12  is mounted on the device  10 . For example, the expulsion form  32  is a slug whose general form complements the drop formation means  34 , produced in the valve  18 , for example the expulsion form  32  is frustoconical. Thus, the expulsion form  32  ensures an immobilization of the valve  18  by jamming the latter against the valve support  26 . 
         [0043]    The protective cap  12  comprises a residual liquid absorption pad  36 , fixed onto the protective cap  12  via a support  42  which is itself fixed, in this example, onto the inner casing  30  of the protective cap  12 . 
         [0044]    The absorption pad  36  is of substantially annular form. It is arranged around the residual liquid expulsion form  32 . It has an orifice  33  receiving the expulsion form  32  of the inner casing  30  of the protective cap  12 . This orifice  33  has a generally cylindrical form and can be of variable diameter. It can also be of frustoconical form and have, on the surface, possible reliefs and/or hollows. For example, the absorption pad  36  has a diameter of 10 mm+/−0.20 mm and the orifice  33  arranged at the center has a diameter of 4 mm+/−0.15 mm. 
         [0045]    The section of the ring of the absorption pad  36  is of substantially rectangular form. One of the corners of the inner face of the absorption pad  36  could possibly be beveled and complement the form of the valve  18 . Advantageously, the two corners of the inner face could be beveled, the absorption pad  36  can therefore be fixed onto the support  42  without preference in one direction or in the other. 
         [0046]    The absorption pad  36  can comprise one or more parts of different forms and/or dimensions. In the example illustrated in  FIG. 1 , the absorption pad  36  consists of two parts, a first part  31  of generally annular form, of a greater diameter than a second part  29 , also of generally annular form, surrounded by the support  42 . 
         [0047]    Advantageously, the absorption pad  36  can have no contact with the valve  18  in order to avoid contacts between the residual liquid present in the absorption pad  36  and the valve  18  when the protective cap  12  is mounted on the device  10 . 
         [0048]    Also advantageously, the absorption pad  36  can have no contact with the inner casing  30  of the protective cap  12  in order to avoid friction between the protective cap  12  and the absorption pad  36  responsible for generating particles. It will therefore be understood that the lateral edge  74  of the absorption pad  36  is spaced apart from centering outlines of the absorption pad  36  borne by the support  42  in the protective cap  12 , the spacing means for the lateral edge of the absorption pad  36  are borne by the support  42 , for example by the lateral walls of the support  42 . 
         [0049]    The absorption pad  36  advantageously comprises a porous material comprising one or more hydrophilic materials. The absorption pad  36  can also be a multilayer pad, in combination with or as an alternative to the case in which it comprises a porous material. The material of the absorption pad  36  can comprise woven or unwoven materials. It can for example comprise hydrophilic cotton, polyethylene (PE) that has undergone a hydrophilic treatment, polyethylene terephthalate (PET) that has undergone a hydrophilic treatment, a poly(vinyl acetate) (PVA) foam or a mixture of a number of hydrophilic materials. According to a particularly advantageous variant, the absorption pad  36  is made of a material comprising EVA (ethylene vinyl acetate). 
         [0050]    The support  42 , on which the absorption pad  36  is fixed, has a generally annular form. Its section is of substantially rectangular form. It can be continuous or discontinuous, and can comprise reliefs or hollows which would make it possible for example to fix it onto the inner casing  30  of the protective cap  12 . Advantageously, it is arranged on the perimeter of the absorption pad  36  and is in direct contact with the inner casing  30  of the protective cap  12 . More particularly in the example, it is positioned on the perimeter of the second part  29  of the absorption pad  36 , which gives the assembly a greater diameter than the diameter of the first part  31  of the absorption pad  36 , advantageously making it possible to return to contact with the inner casing  30  of the protective cap  12  and thus avoiding having the absorption pad  36  taken as a whole rub against this wall of the inner casing  30 . The support  42  advantageously comprises a stronger material than the material of the absorption pad  36 . The support  42  can be made of plastic material, such as polyethylene, treated or untreated. 
         [0051]    The method for assembling the device  10  will now be described. 
         [0052]    The absorption pad  36  and the support  42  are first of all assembled, advantageously by overmolding or by any other mechanical clamping means. In this way, few particles, even no particles at all, are generated in the device  10 . In order to hold the absorption pad  36  on the support  42 , it is also possible to envisage placing the absorption pad  36  on the support  42 . 
         [0053]    Then, the assembly is added into the protective cap  12 . More particularly, the support  42  is fixed inside the inner casing  30 , in such a way that the absorption pad  36  is located around the expulsion form  32  of the valve  18  once the protective cap  12  is mounted, without being in contact with the transverse edges of the inner casing  30  of the protective cap  12 . The outer casing  28  is then mounted on the inner casing  30 , for example by screwing, so that the outer casing  28  can no longer be separated from the inner casing  30 . It will be understood that the outer casing  28  can be assembled with the inner casing  30  before the insertion of the support  42  and of the absorption pad  36 . Before the absorption pad  36  and the support  42  are added into the protective cap  12 , it is possible, particularly advantageously, to perform a step of blowing of compressed air over the assembly of the absorption pad  36  and of the support  42 , so as to clean them of all the particles which might have been deposited. Then, the protective cap  12  is ready to be mounted by screwing onto the dispensing end piece  14 , then, once the tank is filled with the liquid to be dispensed, the assembly formed by the dispensing end piece  14  and the protective cap  12  is screwed onto the neck of the tank. The device  10  is ready to be used. 
         [0054]    The first configuration, called configuration of storage or of hermetic closure of the device  10 , is represented in  FIG. 1 , such that there is no possible communication between the absorption pad  36  and the outside of the device  10 . In this configuration, there is no communication between air passage orifices  52  of the inner casing  30  and air passage orifices  50  of the outer casing  28 . In effect, a crown ring  44  of the outer casing  28  forms, with a surface  46  of the inner casing  30 , a means for closing the evaporation path  48 . In this embodiment, this surface  46  is conical and borne by a part of the inner casing  30  which also forms a centering outline for the absorption pad  36  in the protective cap  12 , in this case in the inner casing  30 . 
         [0055]    Upon first use, the user unscrews the protective cap  12 . He or she grips the outer casing  28  in one hand and the tank in the other hand. He or she rotates the outer casing  28  relative to the inner casing  30 . The rotational movement applied by the user to the device  10  generates a longitudinal translational movement of the outer casing  28  relative to the inner casing  30 , to a ventilation configuration. In this ventilation configuration, represented in  FIG. 5 , by virtue of the longitudinal displacement of the outer casing  28  relative to the inner casing  30 , the crown ring  44  of the outer casing  28  no longer cooperates with the surface  46  of the inner casing  30 , so that a space is created between the crown ring  44  and the surface  46 , and therefore the residual liquid evaporation path  48  is open between the absorption pad  36  and the outside of the device  10 . 
         [0056]    Between two uses, the user screws the protective cap  12  back onto the dispensing end piece  14 . When the cap  12  is mounted on the dispensing end piece  14 , the expulsion form  32  cooperates with the valve  18 , in particular with the drop formation means  34 . Furthermore, this expulsion form  32  comprises grooves  38  which delimit, with the valve  18 , a discharge pathway  40  for the residual liquid contained in the drop formation means  34 . This discharge pathway  40  makes it possible to discharge the residual liquid to the absorption pad  36 , in which it is absorbed. Then, the liquid absorbed by the absorption pad  36  can evaporate out of the device  10  through the evaporation path  48  that is open between the absorption pad  36  and the outside of the device  10 . In effect, the outer casing  28  and the inner casing  30  each comprise means for locking the device  10  in the ventilation configuration, so that, when the user screws the protective cap  12  back onto the device  10 , the evaporation path  48  remains open between the absorption pad  36  and the outside of the device  10 . 
         [0057]    There is therefore no residual liquid stagnating in the drop formation means  34  and the formation of solid residue of the active principle that could result in the delivery of an overdose upon the delivery of a drop or the delivery of solid particles in suspension in the drop upon the next use of the device  10  is avoided. 
         [0058]      FIGS. 3 and 4  show a second embodiment of the liquid-dispensing device  70 , similar to the device  10  of  FIG. 1 . In the following description, the elements that are common to the different embodiments are identified by the same numeric references. This device  70  is also in hermetic closure configuration. 
         [0059]    In this example, the protective cap  72  comprises an absorption pad  35  in a single piece and a support  60  onto which the absorption pad  35  is fixed. The absorption pad  35  is of generally annular form, 10 mm+/−0.20 mm in diameter, and has an orifice  33  allowing the passage of the expulsion form  32  with a diameter of 4 mm+/−0.15 mm. The support  60  extends, in this example, over the entire height of the absorption pad  35 . It also has a part  62  that can at least partially cover a face of the absorption pad  35 . In this example, a part  62   b  of the support  60 , intended to come into abutment against the bottom of the inner casing  30  of the protective cap  72 , extends over the entire top peripheral face of the absorption pad  35 . In this way, advantageously, the absorption pad  35  does not enter into contact with the inner casing  30  and any friction likely to generate particles is thus avoided. The part  62   a  of the support  60 , located on the side of the valve  18 , partially covers the surface of the absorption pad  35  in such a way that the surface of the absorption pad  35 , free of support, can come against the valve  18  and serve its purpose of absorption of the residual liquid present on the valve  18  after use of the device  70  and replacement of the protective cap  72 . 
         [0060]      FIGS. 5 to 13 and 15  illustrate additional embodiments of the device  10 . Hereinbelow, the elements common to the different embodiments are identified by the same numeric references as those of  FIGS. 1 and 2 . 
         [0061]    In the embodiment of  FIG. 5 , the device  10  is in ventilation configuration such that the residual liquid evaporation path  48  is open between the absorption pad  36  and the outside of the device  10 . 
         [0062]    The support  42  extends over the entire height of the absorption pad  36 . It also has a top axial abutment  80  and a bottom axial abutment  82  which, by cooperation with the absorption pad  36 , immobilize the absorption pad  36  in the support  42 . 
         [0063]    It will moreover be noted that the top axial abutment  80  comes into abutment in the inner casing  30 . Thus, when this assembly is added into the inner casing  30 , the support  42  is pressed in until the top axial abutment  80  abuts in the inner casing  30 . It is then observed that the absorption pad  36  does not make any contact with the inner casing  30  while, however, being immobilized in this inner casing  30 . 
         [0064]    The support  42  can be fixed onto the absorption pad  36  by overmolding of the support  42 . 
         [0065]    The embodiment of the device  10  of  FIG. 6  is similar to the embodiment of  FIG. 1 . It differs therefrom in that the absorption pad  36  is placed on the support  42 . There is therefore a space between the support  42  and the second part  29  of the absorption pad  36 . However, this space is such that if the absorption pad  36  moves slightly in a plane at right angles to the central axis  84  of the device  10 , the lateral edge  74  of the absorption pad  36  still remains spaced apart from the inner walls of the inner casing  30 . 
         [0066]    It will also be noted that the absorption pad  36  is immobilized axially by being jammed between the support  42  and the bottom of the inner casing  30 . 
         [0067]    In the embodiment of  FIG. 7 , the support  42  comprises a top part  42 A and a bottom part  42 B, fitted into one another, respectively defining the top  80  and bottom  82  axial abutments. The top axial abutment  80  comes into abutment in the inner casing  30 . It can also be seen that the absorption pad  36  is composed of a plurality of pad layers stacked axially on top of one another. 
         [0068]    The embodiment of  FIG. 8  is similar to the embodiment of  FIG. 3 . It differs therefrom in that the absorption pad  36  is here produced by an axial stacking of pad layers and in that the support  42  comprises a part  62   c  that is located opposite the side of the valve  18  and partially covers the surface of the absorption pad  36  in such a way that the pad layers of the absorption pad  36  are axially blocked between the parts  62   a  and  62   c.    
         [0069]    The embodiment of  FIG. 9  differs from the preceding embodiments in that the support  42  does not form a ring around the absorption pad  36 . In this embodiment, the support  42  forms a plateau on which the absorption pad  36  is placed, in the present case the stacking of absorption pad layers. The support  42  is then snap-fitted onto the inner casing  30  so as to fix the assembly formed by the support  42  and the absorption pad  36  in the inner casing  30 . 
         [0070]    In the embodiment of  FIG. 10 , the support  42  bears the surface  46  which cooperates with the crown ring  44  of the outer casing  28  in order to close the residual liquid evaporation path  48  in the configuration of hermetic closure of the device  10 . The support  42  also comprises the residual liquid expulsion form  32 . The lateral edge  74  of the absorption pad  36  does not therefore come into contact with the inner casing  30  when the assembly formed by the absorption pad  36  and the support  42  is added into the centering outline of the absorption pad  36  borne by the inner casing  30  of the protective cap  12 . There is therefore no or little formation of particles when the support  42  provided with the absorption pad  36  is added into the protective cap  12 . It will also be noted that the support  42  is added from the outside of the inner casing  28 , that is to say from above. 
         [0071]    The embodiments of  FIGS. 11 to 16  represent a device  10  whose protective cap  12  comprises only a single casing  27  similar to the inner casing  30  of the embodiments previously described and a spring element  83 , elastically deformable, capable of stressing the valve  18  to its blocking position. 
         [0072]    In the embodiment of  FIG. 11 , the protective cap  12  comprises air passage orifices  50  from the absorption pad  36  to the outside of the device  10 . It will therefore be understood that the device  10  is represented in the ventilation configuration. The bottom of the protective cap  12  comprises an inner crown ring  86  which forms the centering outline for the absorption pad  36  in the protective cap  12  and the residual liquid expulsion form  32 . 
         [0073]    The support  42  comprises a bottom axial abutment  82  on which the absorption pad  36  rests. The support  42  bears, on its outer radial surface, snap-fitting means  88  which cooperate with complementary snap-fitting means  90  borne by the inner crown ring  86  so as to fix the assembly formed by the support  42  and the absorption pad  36  in the protective cap  12 . 
         [0074]    In the embodiments of  FIGS. 12, 13 and 15 , the support  42  comprises the air passage orifices  50  from the absorption pad  36  to the outside of the device  10  and the residual liquid expulsion form  32 . 
         [0075]    In the embodiments of  FIGS. 12 and 13 , the support  42  is added into the protective cap  12  from the outside, that is to say from above, of the protective cap  12 , unlike the embodiments of  FIGS. 1 to 9, 11 and 15 . 
         [0076]    In these embodiments, the support  42  is fixed in the protective cap  12  by mechanical clamping. Moreover, it will be noted that the protective cap  12  comprises an axial abutment  92  which allows for the positioning of the support  42  relative to the protective cap  12 . 
         [0077]    In the embodiment of  FIG. 12 , the centering outline of the absorption pad  36  in the protective cap  12  is formed by the inner crown ring  86  whereas, in the embodiment of  FIG. 13 , the centering contour of the absorption pad  36  in the protective cap  12  is formed by the lateral wall of the protective cap  12 . 
         [0078]      FIG. 14  illustrates the different steps of the method for assembling the absorption pad  36  and the support  42  with the protective cap  12 . Unlike what has been described previously, it can be seen that the assembly formed by the absorption pad  36  and the support  42  is added through the top of the protective cap  12 . 
         [0079]    In the embodiment of  FIG. 15 , the support  42  is added through the interior of the protective cap  12  and is fixed therein by snap-fitting, by cooperation of snap-fitting means  88 ,  90  respectively borne by the support  42  and the internal crown ring  86  of the protective cap  12 . The support  42  further comprises a plurality of bottom axial abutments  82  which are passed by force upon insertion of the absorption pad  36  into the support  42 . 
         [0080]      FIG. 16  illustrates the device  10  of  FIG. 15  in the configuration of hermetic closure of the device  10  before first use. The protective cap  12  comprises a membrane seal  94  closing the air passage orifices  50  and therefore the residual liquid evaporation path  48  before first use. The membrane seal  94  is removable, preferably disposable, and is added onto the protective cap  12 . Upon first use, the user removes the membrane seal  94  from the device  10  which passes from the configuration of hermetic closure to the configuration of ventilation. 
         [0081]    It will be understood that the invention is not limited to the examples presented above and that modifications will become clearly apparent to those skilled in the art.