Microneedle applicator

Abstract

A microneedle applicator comprising: - an application face (C11) provided with a fluid product outlet (C110) and several microneedles (C111), - a motor (M1) for vibrating the microneedles (C111), - a reservoir (C13) connected to the fluid product outlet (C110), - an actuation member (I11) for conveying the fluid product from the reservoir (C13) to the outlet (C110), characterized in that it comprises three distinct modules (M, C1, I1) axially connected to one another, namely: - a motor module (M) housing the motor (M1), - a cartridge module (C1) housing the reservoir (C13) and forming the application face (C11), - an intermediate module (I1) connected to the motor module (M) and the cartridge module (C1), the intermediate module (I1; I2; I3) comprising The actuation element (I11) and transmission means (I15) for transmitting the vibrations generated by the motor (M1) to the microneedles (C111). (See Figure 1 for abbreviations.)

Description

Title of the invention: Microneedle applicator

[0001] The present invention relates to a microneedle applicator for applying a fluid product to the skin and facilitating its penetration into the upper layer of the epidermis. The invention's field of application is cosmetics, not tattooing. The aim is to enhance the effectiveness of a cosmetic treatment on the skin, not to color the skin.

[0002] Conventionally, this type of cosmetic applicator comprises an application face equipped with at least one fluid product outlet and several microneedles. A motor, often electric, is used to vibrate the microneedles, either alone or in conjunction with the application face. A fluid product reservoir is connected to the fluid product outlet. The reservoir may or may not be integrated into the applicator. When it is integrated, the question then arises of how to fill or replace it. The applicator may be detachable or include a window for accessing the reservoir.

[0003] Furthermore, an actuating element is also provided to convey the fluid product from the fluid product reservoir to the fluid product outlet. This actuating element is often the same one that also controls the motor, which then performs a dual function, namely vibrating the microneedles and conveying the fluid product from the reservoir to the application face.

[0004] The aim of the present invention is to provide a very simple applicator, both in terms of design and use, with a simple and intuitive fluid product distribution.

[0005] To achieve this goal, the present invention provides a microneedle applicator for applying a fluid product to the skin and causing it to penetrate the skin, the applicator defining a longitudinal axis and comprising: - an application face equipped with at least one fluid product outlet and several micro-needles, - a motor to vibrate the micro-needles, - at least one fluid product reservoir connected to the fluid product outlet, - an actuation device to convey the fluid product from the fluid product reservoir to the fluid product outlet, characterized in that it comprises three distinct modules axially connected to one another, namely: - a motor module housing the motor and accessories to operate the motor, - a cartridge module housing the fluid product reservoir(s) and forming the application face, - an intermediate module connected to the motor module and removably connected to the cartridge module, the intermediate module comprising the actuation element and transmission means to transmit the vibrations generated by the motor of the motor module to the micro-needles of the cartridge module.

[0006] The distribution of the fluid product is therefore managed manually by the user, who operates the actuating element of the intermediate module with a finger. It is clear, then, that the cartridge module is technically very simple, since it contains no electrical or electronic components and very few mechanical parts. It constitutes an inexpensive, replaceable cartridge or refill, which the user can easily separate and connect to the intermediate module, which is also relatively simple, since it mainly integrates mechanical transmission means, namely vibration transmission means and thrust transmission means that convert the movement of the actuating element into thrust on the reservoir. The motor module, on the other hand, integrates the motor, its power supply, and its control system, and is therefore a complex and expensive module.

[0007] This separation of the applicator into three distinct modules—the first very simple, inexpensive, and replaceable; the second also simple but durable; and the third complex and expensive—allows various cartridge module models to be combined with a standard motor module by configuring the intermediate module to adapt to both the standard motor module and the specific cartridge module. More precisely, the intermediate module is designed to transmit the vibrations from the motor module to the microneedles of the cartridge module and distribute the fluid product contained in the cartridge module's reservoir(s). A suitable actuation element, and its optional thrust transmission, are housed within the intermediate module.

[0008] The architecture of the microneedle applicator of the invention can thus be likened to a three-stage rocket, with a consumable upper stage, a technical lower stage and an intermediate stage for vibration transmission and actuation.

[0009] Thus, a cosmetic product manufacturer can choose or design a specific cartridge module without worrying about the associated motor module, since it is the intermediate module, specially adapted to both the motor module and the particular cartridge module, that will manage the transmission of vibrations and the actuation of the reservoir(s). The intermediate module thus allows the cartridge module to be decoupled from the motor module by acting as a modular interface. A wide range of microneedle applicators can therefore be offered at a reduced cost, since the motor module can be standardized.

[0010] Advantageously, the intermediate module is also removably connected to the motor module, for example by a screw connection or a bayonet fitting. Alternatively, the intermediate module can be attached and fixed permanently or with difficulty to the motor module. In both cases, the two modules are initially separate and in no way permanently integrated with one another.

[0011] Advantageously, the fluid reservoir has a variable volume, the movement of the actuating member causing a decrease in the volume of the fluid reservoir, so that at least part of its contents is discharged to the fluid outlet with each actuation. Thus, the actuating member acts directly or indirectly on the reservoir without an intermediate active component, such as a pump or motor. The cartridge module may comprise a single reservoir that is completely or preferably partially emptied with each actuation. Alternatively, the cartridge module may comprise several reservoirs that are partially or preferably completely emptied with each actuation.

[0012] According to a preferred design, the applicator may have a general pen-like configuration, adapted to be gripped between the thumb and middle finger with the actuation mechanism operated by means of the index finger. It may also be gripped in the palm of the hand and operated with the thumb.

[0013] According to another aspect of the invention, the cartridge module can be removably connected to the intermediate module by a connection combining an axial movement and a rotary movement, such as a screw or a bayonet.

[0014] According to a first practical embodiment of the invention, the actuating member may comprise a lateral pusher that axially displaces an actuating rod which acts progressively on the reservoir to expel successive doses of fluid product towards the fluid product outlet. Thus, the transverse displacement of the actuating member has the effect of axially displacing the actuating rod which presses against a movable wall (deformable wall or scraper piston) of the reservoir. Each actuation generates a limited displacement of the rod which expels a dose of fluid product from the reservoir, which may contain one or more doses, for example, four. The rod performs a thrust transmission function: the transverse thrust on the actuating member is transformed into an axial thrust of the rod.

[0015] Advantageously, the actuating rod is axially movable against a return spring from a retracted starting position to several successive advanced positions, in which it is locked against any elastic return by a locking detent device. Preferably, the locking detent device is provided with disengagement means to allow the detent device The release mechanism prevents the actuating rod from being released, causing it to return elastically to its retracted starting position. Advantageously, the disengagement means are constrained or blocked in an inoperative state by the connection of the cartridge module to the intermediate module and released elastically or not in a disengaged state by the separation of the cartridge module. The disengagement means advantageously comprise an engagement member that is movable from a free state, corresponding to the disengaged state, to a constrained state, corresponding to the operational state, by a cam formed by the cartridge module, and that is movable from the constrained state to the free state by a return spring, as soon as it is disengaged from the cam.

[0016] Thus, in this single-tank embodiment, connecting the cartridge module to the intermediate module neutralizes the disengagement means, which remain inoperative until the cartridge module is removed from the intermediate module. The disengagement means, combined with the removal of the cartridge module, perform a reset function for the actuating rod, regardless of its advanced position, which then automatically returns to its retracted starting position: the user does not need to perform any action to return the rod to its starting position.

[0017] The interaction between the cam of the cartridge module and the engagement mechanism of the disengagement means also serves to authenticate the cartridge module, as this interaction is comparable to that between a lock and a key. More generally, it can be said that the cartridge module and the intermediate module together form their own means of identification that guarantee the authenticity of the cartridge module. These means of identification may consist of the interaction between the cam of the cartridge module and the engagement mechanism of the disengagement means, but may also consist of any cooperative or complementary interaction between these two modules.

[0018] Of course, in the absence of an engagement element and a cam, it is up to the user to operate the disengagement means to return the rod to zero.

[0019] It should be noted that the axially moving actuating rod, combined with a detent device and advantageously with disengagement means, is a feature that can be implemented in an applicator comprising only two modules: a motor module integrating the motor, the actuating member, the rod, the detent device and advantageously disengagement means, and a cartridge module identical or similar to the one already described, which can be used to deactivate / release the disengagement means during its assembly / removal. In other words, protection could be sought for these features in a two-module applicator, and even in a single-module applicator with a replaceable reservoir.

[0020] According to a second practical embodiment of the invention, the cartridge module may include a rotating barrel supporting several fluid product reservoirs, which can thus be brought in turn into an emptying position, the intermediate module includes a lateral pusher which acts on the reservoir located in the emptying position to force its contents towards the fluid product outlet.

[0021] According to a first embodiment, the lateral pusher can axially move an actuating rod against a return spring from a starting position to an extended position corresponding to the maximum emptying of the tank. The actuating rod performs a thrust transmission function: the transverse thrust on the pusher is transformed into an axial thrust of the rod.

[0022] According to a second embodiment, the lateral pusher can act directly on the reservoir through a lateral window in the barrel. Advantageously, the intermediate module can include actuating means for rotating the barrel of the cartridge module. Preferably, the application face of the cartridge module can be prevented from rotating by the intermediate module, each reservoir comprising a removable sealing element that is removed before reaching the emptying position by an opening element fixed to the application face. The reservoirs can, for example, be in the form of small flexible vials with a sealing head that is cut by a fixed blade just before reaching the emptying position, where the pusher will crush it and force its contents out towards the outlet at the application face.

[0023] It should be noted that the rotating drum with multiple reservoirs, actuated laterally or axially, is a feature that can be implemented in an applicator comprising only two modules, namely a motor module integrating the motor and the lateral plunger, and a cartridge module with a drum identical or similar to that already described. In other words, protection could be sought for these features in a two-module applicator, and even in a single-module applicator, with replaceable reservoirs.

[0024] According to another aspect, the application face may comprise a plate equipped with micro-needles and through which the fluid product outlet passes. The fluid product outlet may also be located at the periphery of the application face.

[0025] Advantageously, the applicator may further include means for adjusting the penetration depth of the microneedles, advantageously acting on the axial position of the motor in the first module. Indeed, it is sometimes useful to allow the microneedles to penetrate more or less deeply depending on the cosmetic product, the desired treatment, or the quality and nature of the skin.

[0026] The applicator may also include motor control means that automatically deactivate it when the modules are not connected. This is of safe use.

[0027] The spirit of the invention lies in segmenting the microneedle applicator device into three modules, units or sub-assemblies, with a standard module, a disposable custom module and a middle module which makes the transmission between the other two modules and which integrates the means to push fluid product out of the reservoir(s) towards the application face of the disposable module, which includes microneedles.

[0028] The invention will now be described more fully with reference to the accompanying drawings which give, by way of non-limiting examples, several embodiments of the invention.

[0029] In the figures:

[0030] [fig. 1] Fig. 1 is a schematic perspective view, locally cut out, of a microneedle applicator according to a first embodiment of the invention.

[0031] [fig.2] Fig.2 is a vertical axial cross-sectional view through the applicator of the [fig.l],

[0032] [fig.3] Fig.3 is a view similar to that of Fig.2 with the applicator in a disassembled state

[0033] [fig.4] Fig.4 is a similar view of figures 2 and 3 with the applicator already activated

[0034] [fig.5] Fig.5 is a view similar to those in figures 2 to 4 with the applicator in a disengaged state,

[0035] [fig.6a] Figures 6a and 6b are highly schematic representations intended to to illustrate a form of realization of the disengagement means and their actuation,

[0036] [fig.6b] cf. [fig.6a]

[0037] [fig.7a] Figures 7a and 7b represent another embodiment for the disengagement means and their actuation,

[0038] [fig.7b] cf. [fig.7a]

[0039] [fig.8] Fig.8 is a vertical cross-sectional view through the cartridge and intermediate modules of an applicator according to a second embodiment of the invention,

[0040] [fig.9a] Fig.9a and 9b are views similar to that of Fig.8, respectively in the actuated and returned positions,

[0041] [fig.9b] cf. [fig.9a]

[0042] [fig. 10a] Figures 10a and 10b are schematic vertical cross-sectional views through an applicator of the invention according to a third embodiment, respectively in the rest state and in the actuated state, and

[0043] [fig. 10b] cf. [fig. 10a]

[0044] [fig.l 1] Fig.l 1 is a perspective view of the applicator of figures 10a and 10b in its disassembled state.

[0045] The applicator of the invention is purely cosmetic, or even dermatological, excluding tattooing. It combines two treatment methods: the distribution of a cosmetic product, which may be a cream, ointment, lotion, serum, etc., and the perforation of the stratum corneum to reach the epidermis, without touching the dermis, by means of micro-needles. Depending on the nature of the cosmetic product and the desired result, the cosmetic product is applied before, at the same time as, or after the micro-perforation. The applicator of the invention is primarily intended for home use, in that the user will use the applicator on themselves. However, it can also be used professionally.

[0046] In the three embodiments of the invention illustrated in the figures, the applicator of the invention comprises three distinct modules, namely a first motor module M, a second cartridge module Cl, C2, C3, and a third intermediate module II, 12, 13, mounted or interposed between the motor module M and the cartridge module Cl, C2, C3: the intermediate module II, 12, 13 thus forms the link between the motor module M and the cartridge module Cl, C2, C3. The three modules are arranged along a longitudinal axis X. The intermediate module II, 12, 13 is advantageously removably connected to the motor module M. A permanent connection between these two modules is possible. The intermediate module II, 12, 13 is advantageously removably connected to the cartridge module Cl, C2, C3. A permanent connection is possible in certain cases.Preferably, the modules can be connected and disconnected easily and quickly by the user themselves, for example, using both hands by applying torque and / or a push / pull between two modules. When the three modules are assembled, the applicator has a general pen-like configuration along the longitudinal X-axis. The applicator can also be gripped in the same way as a pen.

[0047] The first motor module M can be common to both embodiments. It will not be described in detail, as it is not critical to the invention. It can be a standard commercially available module. In [Fig. 1], it can be seen that the motor module M contains a motor M1, which is preferably an electric motor. It can be a small rotary motor that drives a shaft M10 in rotation. An electromagnet motor, a linear motor, or a piezoelectric motor can also be used. The motor M1 is powered by a battery M2 and controlled by electronics M3, which manages the rotational speed of the shaft M10, the sequences and durations of motor activation, etc. An external activation button M21 allows the user to switch the applicator on.The free end of the M10 shaft is capped with an M5 housing, allowing the rotation of the M10 shaft to be transformed into a vibratory axial oscillation, transmitted by an output shaft M50, intended to connect to the inter- module. median.

[0048] Of course, this is only a non-limiting embodiment: any motor module M adapted to generate axial vibration can be implemented within the framework of the present invention, given that the motor module M is not critical to the invention.

[0049] Reference will now be made to [fig.2] to describe in detail the structure of the cartridge module Cl and the intermediate module II of an applicator according to a first embodiment of the invention.

[0050] The cartridge module Cl comprises a cartridge body CIO which has a connecting flange C101 at one end and a fluid outlet Cl 10 at the other end. The cartridge module Cl includes an application face Cil, which is provided with several microneedles Cl 11. This application face Cil is positioned adjacent to the fluid outlet Cl 10. The application face Cl 1 is connected to a vibration transmission rod C12 that passes through the cartridge body CIO. The cartridge Cl also contains a fluid reservoir C13, which slides within a chamber C103 formed by the cartridge body CIO. At the bottom of this chamber C103, the cartridge body CIO forms a perforation needle C104, which communicates directly via a conduit to the fluid outlet Cl 10.The fluid reservoir C13 includes a pusher piston C14 which is slidably mounted inside the reservoir to vary its usable volume. The fluid reservoir C13 can thus be in the form of a cylinder with the pusher piston C14 at one end and a pierceable membrane C131 at the other end, designed to be pierced by the piercing needle C103 of the cartridge body CIO. The fluid reservoir C13 can also be a component that can be removed from the CIO body after use and replaced with a new replacement reservoir.

[0051] The cartridge module C1 is removably connected, in particular by rotation (bayonet or screw fitting), to the intermediate module II, which includes for this purpose a connecting ring 1101 into which the collar C101 can be stably received after rotation. This connecting ring 1101 is formed by a body 110, which is also advantageously removably connected to the motor module M. The connection can be made by screwing, bayonet fitting, or snap-fit. A permanent connection is also possible. The intermediate module II includes an actuating member 111, which may be in the form of a lateral pusher, thus moving perpendicularly to the X-axis. This actuating member II1 may protrude from the body II through a lateral window in the body 110. The actuating member II1 includes push tabs. 1111, whose function will be given below. These legs 1111 extend inclinedly inwards towards the body 110. The intermediate module II also includes an actuating rod 112 which extends parallel to the X-axis. This rod 112 includes a push plate 1121 intended to come into contact with the push piston C14 of the reservoir C13 of the cartridge module Cl. The rod 112 includes along its length several teeth 1123, as well as push lugs (not shown). The end opposite the push plate 112 forms a heel 1122 on which a return spring 1124 rests. Thus, the actuating rod 112 is forced away from the push piston C14 by the return spring 1124. The movement of the actuating rod 112 towards the push piston C14 is generated by the depressing of the actuating member II 1 whose push lugs 1111 engage with the push lugs (not shown) of the actuating rod 112.The inclined orientation of the push lugs II 11 has the effect of moving the actuating rod 112 in the direction of the push piston C14.

[0052] The intermediate module 110 also includes a detent device 113 comprising a detent 1130 intended to successively engage with the teeth 1123 of the actuating rod 112. In other words, the detent device 113 allows the actuating rod 112 to maintain its position after each actuation of the actuating member 111. Without this detent device 113, the rod 112 would return each time to its original position, under load from the return spring 1124. The detent device 113 thus neutralizes the load on the spring 1124.

[0053] The intermediate module II also includes disengagement means 114 that allow the detent device 113 to be disengaged from the actuating rod 112. These disengagement means 114 may, for example, include a plate 140 that is pivotally mounted on an axis 1141 fixed to the body 110. This plate 140 is also connected to the detent device by a connecting rod 1134. At its end, the plate 1140 includes an engagement member 1143 that engages with the ring 1101. Finally, a spring 1142 compresses the plate 1140 in such a way as to disengage the engagement member 143 from the ring 1101. The operation of these disengagement means will be explained below.

[0054] The intermediate module II also includes a vibration transmission bar 115 which connects the shaft M50 of the motor module M to the transmission rod C12 of the cartridge module CL

[0055] In [Fig. 3], the applicator is shown with the cartridge module Cl disconnected from the intermediate module II. The connection collar Cil is disengaged from the connection ring 1101. It can then be observed that the reservoir C13 is not completely engaged inside the chamber C103 of the body CIO: the needle of The perforation 104 has not yet penetrated the membrane C131 of the reservoir C13, so the pusher piston C14 protrudes from the body C10. The cartridge module is in its initial position before use, in which the reservoir C13 is hermetically sealed. When the cartridge module C10 is connected to the intermediate module II, a push tab 1104 formed by the body 110 pushes the reservoir C13 towards the perforation 104, thus piercing the membrane C131 of the reservoir C13, which is then in its operating position. The user then simply needs to rotate the cartridge module C10 to engage its collar C101 in the connecting ring 1101 of the intermediate module II. Once connected, the push plate 1121 of the actuating rod 112 makes light or loose contact with the pusher piston C14 of the reservoir C13.The intermediate module II is also shown in its initial configuration in [fig.2].

[0056] The user can then apply pressure to the actuating member II 1 so as to push it into the body 110 of the intermediate module II. In doing so, the push tabs 1111 will engage with the push lugs (not shown) of the actuating rod 112, which is then moved axially against the push piston C14. At the end of the actuation, a tooth 1123 of the rod 112 will engage with the notch 1130 of the locking device 113. After two successive actuations, the applicator is in the configuration shown in [Fig. 4]. Two doses of fluid product have been dispensed through the fluid product outlet Cl 10 located near the application face Cil equipped with the micro-needles Cl 11. It can be seen in [Fig. 4] that two doses of fluid product remain to be dispensed. After each dose is dispensed, a tooth 1123 of the rod 112 will engage with the notch 1130 of the locking device 113.

[0057] Thanks to the disengagement means 114, the user can return the actuating rod 112 to its initial position at any time. This is shown in [Fig. 5]. It can be seen that the plate 1140 is pivoted about its axis 1141 so as to disengage its engagement member 1143 from the crown 1101. This disengagement is further facilitated by the spring 1142. To reach this position, the user simply needs to press on the plate 1140 to the right of the pivot axis 1141. The plate 1140 will thus move the connecting rod 1134, which will pivot the detent device 113 so as to disengage its notch 1130 from the tooth 123 of the rod C12 with which it was engaged. We can see on [fig.5] that the notch 1130 is moving away from the first tooth 1123 and that the rod 112 has returned to its initial position under the action of the return spring 1124.

[0058] In this embodiment, the intermediate module II therefore allows successive action on a fluid product reservoir C13 to deliver successive doses of The product is fluid. The locking device 113 maintains the position of the rod 112 after each actuation, and the disengagement means 114 return the rod 112 to its initial position. The disengagement means are manually operated, meaning the user must act on the plate 140 to disengage the locking device 113 from the actuating rod 112.

[0059] With reference to Figures 6a and 6b, a very schematic representation can be shown of how the disengagement means can be automatically actuation. The push rod 112 is schematically represented with its push plate and its teeth 1123. The detent device 113 is also schematically represented. The disengagement means 114' also include a plate or rod 1140 pivotally mounted about an axis 1141. At its other end, the disengagement means 114' include an engagement member 1143' which is engaged between two cams C151 and C152 formed by the C1O body of the cartridge module CL. The cams C151 and C152 are inclined or eccentric, so as to be able to drive the engagement member 1143' in movement about the pivot axis 1141. Figure 6a shows the disengagement means 114' in an operating state, with the detent device 113 engaged with a tooth 1123 of the actuating rod 112.This operating position is reached when the cartridge module Cl is connected to the intermediate module II.

[0060] In [Fig. 6b], it can be seen that the cam C151 has driven the plate or rod 1140 downwards by pivoting about the pivot axis 1141. The detent device 113 is then disengaged from the tooth 1123 of the rod 112. This disengaged configuration is reached when the cartridge module Cl has been rotated relative to the intermediate module II until it can be disconnected. The plate or rod 1140 can be held in the disengaged position of [Fig. 6b] by a spring, comparable to the spring 1142 of the preceding figures.

[0061] Through this very schematic embodiment, it can be understood that the disengagement means 114' can be actuated automatically, simply by connecting / disconnecting the cartridge module Cl on the intermediate module II, by means of a rotation of the cartridge module Cl relative to the intermediate module II. Thus, the user does not even have to worry about the return of the actuating rod 112 to its initial position, since the separation of the cartridge module Cl from the intermediate module II automatically actuates the disengagement means which allow the rod 112 to return to its retracted rest position.

[0062] Figures 7a and 7b are highly schematic views intended to illustrate that the disengagement means can also be actuated by a purely axial displacement of the cartridge module Cl relative to the intermediate module 12. The disengagement means 114” include an engagement member 1143” engages with a housing C16 formed by the cartridge module Cl, when the cartridge module Cl is connected to the intermediate module II. The stop device 113 then engages with a tooth 1123 of the actuating rod 112.

[0063] As soon as the cartridge module Cl is disconnected from the intermediate module II, the engagement member 1143” is disengaged from the housing C13 and the disengagement means can then pivot around the axis 1141, so as to disengage the stop device 113 from the tooth 1123. This is shown in [fig.7b].

[0064] This schematic example aims to illustrate that the actuation of the disengagement means can also be achieved by a translational movement of the cartridge module Cl relative to the intermediate module II.

[0065] This intermediate module II, with its lateral actuation member 111, its axially moving actuating rod 112, its locking device 113, and its manual 114 or automatic 114' or 114" disengagement means, is preferably removably connected to both the motor module M and the cartridge module C1. However, embodiments can be imagined in which this intermediate module II can be integrated into the motor module M and / or the cartridge module C1. A one-piece applicator with the possibility of replacing the reservoir C13 through an access window is even conceivable. In particular, the disengagement means constitute a feature that can be implemented in any applicator comprising a multi-dose reservoir.

[0066] The next two embodiments to be described have several features in common. First, the intermediate module includes a thrusting element that acts on the cartridge module's reservoir so as to return it to its initial starting position each time. Therefore, there is no successive advancement as in the first embodiment of the invention. As for the cartridge module, it incorporates a rotating drum loaded with several reservoirs: the user can rotate the drum to bring a reservoir to the position of the thrusting element so that the reservoir can be mostly, or preferably completely, emptied. The user then simply rotates the drum to bring the next reservoir to the position of the thrusting element. It will be seen that the rotational drive of the drum can be performed directly at the cartridge module or at the intermediate module.Naturally, the intermediate module includes vibration transmission means for transmitting the vibrations generated by the motor module M to the micro-needle application face of the cartridge module. The motor module M can also be removably connected to the intermediate module, just as in the first embodiment of the invention. Similarly, the intermediate module can be removably connected to the [unclear] by a rotational movement or a simple axial translational movement. cartridge module.

[0067] Reference will now be made to Figures 8, 9a, and 9b to describe the second embodiment of the invention. The motor module M, which is only shown schematically, may be identical or similar to that of the first embodiment. The intermediate module 12 comprises a body 120 through which a vibration transmission element 125 passes, extending substantially or perfectly axially. The body 120 contains an actuating rod 122 that moves axially. This actuating rod 122 is actuated by a spring 1224 in the direction of the motor module M. The rod 122 includes a thrust plate 1221 intended to come into contact with one of the reservoirs of the cartridge module, as will be seen below. The rod 122 is connected to an actuation member 121 by a connecting rod 1211. The actuation member 121, as in the first embodiment, is movable perpendicularly to the axis of the applicator.The connecting rod 1211 serves to transform the transverse or lateral displacement of the actuating member 121 into a purely axial displacement of the actuating rod 122. The actuating member 121 is driven into the body 120 against the force exerted by the return spring 1224, which returns the rod 122 and the actuating member 121 to their extended starting position, as shown in Figures 8 and 9b. In its fully driven position, the actuating member 121 is in the configuration shown in [Fig. 9a]. Thus, with each push on the actuating member 121, the actuating rod 122 is moved from an initial starting position ([fig. 8] or 9b) to a maximum extended position ([fig. 9a]), then returns to its initial starting position under the action of the return spring 1224. Therefore, there is no intermediate position as in the first embodiment of the invention.The mechanism of intermediate module 12 is therefore simpler than that of intermediate module II of the first embodiment.

[0068] The cartridge module C2 comprises a body C20 which is fixed relative to the body II of the intermediate module 12 once the cartridge module C2 is in place on the intermediate module 12. This cartridge module C2 supports the application face C21, which is equipped with microneedles C211. The application face C21 is connected to a vibration transmission rod C22 intended to be coupled to the vibration transmission element 125 of the intermediate module 12. The body C20 also defines a fluid product outlet C210, which is located near the application face C21. This fluid product outlet C210 is connected by an internal conduit to a piercing needle C203. The cartridge module C2 also comprises a rotating barrel C23, which is rotatably mounted on or within the body C20. This barrel C23 can be rotated by the user at its accessible outer periphery.The C23 barrel contains several C24 reservoirs, which can be in the form of crushable pouches. or piston-operated reservoirs. Each reservoir C24 comprises a drillable front wall 241 intended to be drilled by the drill bit C203. In the initial position, the diaphragm C241 is intact and positioned adjacent to the drill bit C203, as can be seen in [Fig. 8]. In this initial starting position, the push plate 1221 of the actuating rod 122 is positioned near the bottom of the reservoir C24. A lateral push on the actuating member 121 causes it to move, which in turn causes, via the connecting rod 1211, the axial movement of the actuating rod 122, whose member in the push plate 1221 will first move the reservoir C23 in its barrel to pierce the membrane 241, and then crush the reservoir so as to force its contents to the level of the fluid product outlet 210. The [fig.[9a] represents the fully depressed position with the push plate 1221 having reached its maximum forward position. The C24 tank is empty or practically empty.

[0069] As soon as the user releases pressure on the actuating member 121, it returns to its initial starting position under the action of the force of the return spring 1224. The configuration shown in [Fig. 9b] is then as follows: the user simply rotates the barrel C23 to bring another reservoir C24 opposite the push plate 1221 of the actuating rod 122. A complete cycle is then achieved.

[0070] In this embodiment, the entire cartridge module C2 can be replaced once all its reservoirs C24 have been emptied. Alternatively, it is also possible to replace only the drum C23, or even to replace only the reservoirs C24 while retaining the drum C23. Thus, several configurations are possible while maintaining the same architecture for the cartridge module C2.

[0071] It is also possible to consider implementing the cartridge module C2 on a main module integrating both the motor module M and the intermediate module 12. In other words, the actuation means of the intermediate module 12 would be integrated into a common or main module integrating all the means to actuate both the application face C21 and the tanks C24.

[0072] Figures 10a, 10b, and 11 illustrate the third embodiment of the invention, in which the cartridge module C3 also incorporates a rotating barrel C33 receiving several reservoirs C34. As in the second embodiment, the entire cartridge module C3 can be replaced, or only its barrel C33, or only its reservoirs C34. The cartridge module C3 comprises a fixed body C30 that forms the fluid product outlet C310, and a cutting blade C301, the function of which will be described below. The application face C31, with its micro-needles C311, is positioned in the immediate vicinity of the outlet of Fluid product C310. This application face C31 extends into a vibration transmission rod C35 designed to engage with the vibration transmission means (not shown) of the intermediate module 13. The rotating barrel C33 is rotatably received on or within the body C30. The rotating barrel C33 includes lateral windows C333 providing access to the reservoirs C34, which include a removable sealing element C341 that protrudes into a conduit C302 opening at the fluid product outlet C310. Thus, when the barrel C33 is rotated, its sealing element C341 engages with the cutting blade C301 that separates it from the rest of the reservoir. In [Fig. 10a], a removable sealing element 341 can be seen dropped to the bottom of the body C30. This C341 sealing element is that of the C34 reservoir located opposite the C302 conduit.It is also understood that the reservoir located below C34 still has its removable sealing element C341 pointing into the body C30. Thus, the cutting blade C301 acts as the opening element for the reservoir C34 by rotating the barrel C33. Advantageously, the reservoirs C34 can be in the form of small, crushable vials made of deformable material.

[0073] The intermediate module 13 comprises a body 130, in which a rotating actuating ring 134 is received. This ring engages with the barrel C33, enabling it to be rotated. Figure 11 shows that the actuating ring 134 includes operating markings visible through a window in the body 130.

[0074] The intermediate module 13 also includes an actuating member 131, which is simply a lateral push button that the user can depress with a finger. This lateral push button may be shaped like a stud, guided by a channel formed by the body 130. When a reservoir C34 is positioned below the actuating member 131, its removable sealing element C341 has already been removed by the blade C301. This configuration is shown in [Fig. 10a]. The user then simply presses the actuating member 131 to engage the flexible reservoir C34 and crush it. This configuration is shown in [Fig. 10b]. The fluid product from the reservoir C34 is thus forced through the conduit C302 to the fluid product outlet C310.When the user releases pressure on the actuating member 131, it returns to its rest position, either by a return spring (not shown) or by the elastic memory of the reservoir C34, which returns to its initial position after emptying. After applying the fluid product to the user's skin using the application face 31, the user can rotate the actuating ring 134 to bring the next reservoir below the actuating member 131 and repeat the operation.

[0075] It can be noted that in this embodiment the cartridge module C3 is pra fully received inside intermediate module 13, with only its C30 body protruding forward.

[0076] Although not shown, it can be imagined that the intermediate module 13 includes an access hatch allowing access to the side windows C333 of the barrel to remove and insert tanks C34.

[0077] The intermediate module 13 includes connection means 136 adapted to come into contact with the motor module M.

[0078] In the three embodiments just described, the microneedle applicator of the invention comprises three distinct modules or stages that are connected to each other, preferably in a removable manner. The intermediate module II, 12, 13 always includes an actuating member 111, 121, 131 and vibration transmission means 115, 125. The cartridge module C1, C2, C3 always includes an application face C11, C21, C31 equipped with microneedles C11, C211, C311, as well as a fluid product outlet C10, C210, C310. It also includes a vibration transmission member for connecting the application face to the vibration transmission means of the intermediate module.

[0079] Although certain features have been described in relation to this three-stage module architecture, it should be understood that these features could be implemented in different architectures. In particular, the actuation means of the first embodiment could be integrated into any microneedle applicator, whether it consists of one, two, or three stages or modules. Similarly, the rotating barrel C23, C33 has been described in relation to this three-stage or module architecture. However, these barrels could also be implemented in any microneedle applicator, whether it comprises three stages, two stages, or only one stage.

[0080] The three-stage architecture of the module of the invention has as its main purpose the ability to adapt a wide variety of cartridge modules to a standard motor module, thanks to the adaptability and modularity of the intermediate stage.

Claims

Demands

1. A microneedle applicator for applying a fluid product to the skin and facilitating its penetration into the skin, the applicator defining a longitudinal axis X and comprising: - an application face (Cil; C21; C31) provided with at least one fluid product outlet (Cl 10; C210; C310) and several microneedles (Cl 11; C211; C311), - a motor (M1) for vibrating the microneedles (Cl 11; C211; C311), - at least one fluid product reservoir (C13; C24; C34) connected to the fluid product outlet (Cl 10; C210; C310), - an actuation member (111; 121; 131) for conveying the fluid product from the fluid product reservoir (C13; C24; C34) to the fluid product outlet (Cl 10; C210; C310), characterized in that it comprises three distinct modules (M, Cl; C2; C3, Il; 12;13) axially connected to each other, namely: - a motor module (M) housing the motor (M1) and accessories for operating the motor (M1), - a cartridge module (C1; C2; C3) housing said at least one fluid product reservoir (C13; C24; C34) and forming the application face (C11; C21; C31), - an intermediate module (C11; 12; 13) connected to the motor module (M) and removably connected to the cartridge module (C11; C2; C3), the intermediate module (C11; 12; 13) comprising the actuating member (111; 121; 131) and transmission means (115; 125) for transmitting the vibrations generated by the motor (M1) of the motor module (M) to the microneedles (C11; C211; C311) of the cartridge module (C11; C2; C3).;

2. Applicator according to claim 1, wherein the intermediate module (11; 12; 13) is removably connected to the motor module (M).

3. Applicator according to claim 1 or 2, wherein the fluid product reservoir (C13; C24; C34) is variable volume, the movement of the actuating member (111; 121; 131) causing a decrease in volume of the fluid product reservoir (C13; C24; C34), so that at least part of its contents is forced back towards the fluid product outlet (Cl 10; C210; C310).

4. Applicator according to any one of the preceding claims, having a general pen-like configuration, adapted to be gripped between the thumb and middle finger with the actuation member (II 1; 121; 131) ac-tionnable by means of the index finger.

5. Applicator according to any one of the preceding claims, wherein the cartridge module (Cl; C2; C3) is removably connected to the intermediate module (Il; 12; 13) by a connection combining axial movement and rotary movement, such as a screw or a bayonet.

6. Applicator according to any one of the preceding claims, wherein the actuating member (111) comprises a lateral pusher which axially displaces an actuating rod (112) which acts progressively on the reservoir (Cl3) to discharge successive doses of fluid product towards the fluid product outlet (Cl10).

7. Applicator according to claim 6, wherein the actuating rod (112) is axially movable against a return spring (1124) from a retracted starting position to several successive advanced positions, in which it is locked in position against any return to the rear by a locking detent device (113).

8. Applicator according to claim 7, wherein the stop device (113) is provided with disengagement means (114; 114'; 114") to allow the stop device (113) to release the actuating rod (112), which then elastically returns to its retracted starting position.

9. Applicator according to claim 8, wherein the disengagement means (114'; 114") are constrained in an inoperative state by the connection of the cartridge module (Cl) on the intermediate module (II) and released elastically in a disengaged state by the separation of the cartridge module (Cl), the disengagement means (114'; 114") advantageously comprising an engagement member (1143'; 1143") which is movable from a free state, corresponding to the disengaged state, to a constrained state, corresponding to the operating state, by a cam (C151, Cl852; C16) formed by the cartridge module (Cl) and which is movable from the constrained state to the free state by a return spring ( ), as soon as it is disengaged from the cam (C151, Cl852; C16).

10. Applicator according to claim 1 or 2, wherein the cartridge module (C2; C3) comprises a rotating barrel (C23; C33) supporting several fluid product reservoirs (C24; C34), which can thus be brought in turn into an emptying position, the intermediate module (12; 13) includes an actuation member (121; 131) which acts on the tank located in the emptying position to force its contents towards the fluid product outlet (C210; C310).

11. Applicator according to claim 10, wherein the actuating member (121) axially moves an actuating rod (122) against a return spring (1224) from a starting position to an extended position corresponding to the maximum emptying of the reservoir (C24).

12. Applicator according to claim 11, wherein the actuating member (131) acts directly on the reservoir (C34) through a side window (C333) of the barrel (C33).

13. Applicator according to claim 12, wherein the intermediate module (13) includes actuating means (134) for driving the barrel (C33) of the cartridge module (C3) into rotation.

14. Applicator according to claim 12 or 13, wherein the application face (C31) of the cartridge module (C3) is rotationally blocked by the intermediate module (13), each reservoir (C34) comprising a removable sealing member (C341) which is removed before reaching the emptying position by an opening member (C301) integral with the application face (C31).