EP1890753A2

EP1890753A2 - Fluid product dispensing device

Info

Publication number: EP1890753A2
Application number: EP06709441A
Authority: EP
Inventors: Andrew Gordon Pocock; Stuart Brian William Kay; Paul Greenhalgh; Wayne O'hara; Xavier Donnette
Original assignee: Valois SAS
Current assignee: Aptar France SAS
Priority date: 2005-01-25
Filing date: 2006-01-25
Publication date: 2008-02-27
Also published as: JP2008528157A; FR2881119B1; WO2006079749A3; CN101107034A; FR2881119A1; WO2006079749A2; US20080099016A1

Abstract

The invention concerns a fluid product dispensing device, in particular for inhaling dry powder, comprising a plurality of individual reservoirs (21) containing each a single dose of fluid product, such as powder, said reservoirs (21) being made in the form of an elongated strip (20), opening means (40) being provided to open a reservoir upon each actuation, said device including strip receiving means for receiving the part of the strip (35) supporting the empty reservoirs, said receiving means including a rotary element fixed at the front end of said reservoir strip (20).

Description

Fluid dispensing device

The present invention relates to a fluid dispenser device, and more particularly to a dry powder inhaler.

Dry powder inhalers are well known in the state of the art. There are different kinds. A first type of inhaler contains a reservoir receiving a multitude of doses of powder, the inhaler being provided with dosing means allowing each actuation to separate a dose of this powder from the reservoir to bring it into an expulsion conduit to to be distributed to the user. Another type of inhaler is to package the doses of powder in pre-dosed individual tanks, then to open one of these tanks each actuation of the inhaler. This implementation ensures a better seal of the powder, since each dose is open at the time of its expulsion. To achieve these individual tanks, various variants have already been proposed, such as an elongated blister strip or blisters arranged on a rotating circular disk. Inhalers with individual reservoirs, such as capsules, which are to be loaded into the inhaler just prior to use thereof have also been described in the state of the art. The advantage of these devices is that it is not necessary to store all the doses inside the device, so that it can be reduced in size. On the other hand obviously, the use is more complex, since the user is obliged to load a capsule in the inhaler before each use. All types of inhalers described above and existing have advantages and disadvantages related to their structure and operation. Thus, with some inhalers, there is the problem of accuracy and reproducibility of the dosage at each actuation. Similarly, the effectiveness of the distribution, that is, the portion of the dose that actually enters the user's lungs to have a beneficial therapeutic effect, is also a problem with a number of inhalers. One solution to this specific problem has been to synchronize the expulsion of the dose with the inhalation of the patient. Again, this could cause drawbacks, namely that usually in this type of device, the dose is loaded into an expulsion conduit before inhalation, and the expulsion is synchronized with the inhalation. This means that if the user drops, shakes or unwantedly or improperly handles the inhaler between the time he or she changed the dose (either from a multi-dose reservoir or from an individual reservoir) and when inhaling, it may lose all or part of this dose, it may be distributed inside the device. In this case, there may be a high risk of overdose during the next use of the device. The user who will realize that his dose is not complete will charge a new dose into the device, and when inhaling this new dose, part of the previous dose lost in the device could then be expelled at the same time as the new dose, causing an overdose. Depending on the treatments considered, this overdose can be very harmful and it is an increasingly strong requirement of the authorities of all countries to minimize this risk of overdose.

Regarding the opening of the individual tanks, it has been proposed to peel or peel off the closure layer. This has the disadvantage of difficult control of the forces to be applied to ensure full opening without the risk of opening the next tank, especially if the opening means must be actuated by inhalation. Alternatively, it has been proposed to pierce the wall or closure layer. This has the disadvantage that the cut wall portions may retain a portion of the dose inside the tank, the accuracy and reproducibility of dosing is not guaranteed.

The present invention aims to provide a fluid dispenser device, in particular a dry powder inhaler that does not reproduce the aforementioned drawbacks.

In particular, the present invention aims to provide such an inhaler that is simple and inexpensive to manufacture and assemble, reliable in use, ensuring a metering accuracy and reproducibility of the dosage at each actuation, providing optimal performance in the effectiveness of treatment, allowing to distribute a large part of the dose at the level of the areas to be treated, in particular the lungs, safely and effectively avoiding the risks of overdoses, of dimensions as small as possible, while ensuring a seal and absolute integrity of all doses until their expulsion. The subject of the present invention is therefore a device for dispensing fluid product, in particular for dry powder inhalation, comprising a plurality of individual reservoirs each containing a single dose of fluid, such as powder, said reservoirs being made under in the form of an elongate strip, opening means being provided for opening a reservoir at each actuation, said device comprising band receiving means for receiving the band portion supporting the empty tanks, said receiving means comprising an element rotating attached to the front end of said tank strip.

Advantageously, said rotary element is connected to drive means of the reservoir strip.

Advantageously, said tape drive means comprise a rotatable guide wheel.

Advantageously, the rotation of the guide wheel is performed manually by the user. Advantageously, said rotary element exerts only a guiding action in rotation of the end of the reservoir strip without exerting any traction on said strip.

Advantageously, said tank band portion supporting the empty tanks is wound as a coil in a storage space.

Advantageously, the empty tanks are flattened by a flattening device before being stored in a storage space.

Advantageously, said opening means comprise drilling and / or cutting means adapted to cut a closure wall of the reservoir so that the cut part (s) does not obstruct (s) the opening (s) formed. Advantageously, the dispensing device comprises a dose indicator to indicate to the user the number of doses dispensed or remaining to be dispensed.

These and other features and advantages of the present invention will appear more clearly in the following detailed description of several embodiments and variants thereof, with reference to the accompanying drawings, given as non-limiting examples, on which ones,

FIG. 1 is a diagrammatic cross-sectional view of a dispensing device according to a first embodiment; FIGS. 2a and 2b are detailed views of the triggering system by inhalation, according to an advantageous embodiment. , respectively without and during inhalation,

FIG. 3 is a diagrammatic view of another embodiment of the triggering system by inhalation, FIG. 4 is a schematic view of still another embodiment of the triggering system by inhalation,

FIGS. 5a to 8b show a sequence of use of the device of FIG. 1, respectively showing an external view and an internal view of the device for the respective resting steps (FIGS. 5a and 5b), of loading or opening of the device (FIGS. 6a and 6b), inhalation (FIGS. 7a and 7b) and end of use or closure of the device (FIGS. 8a and 8b),

FIGS. 9 and 10 show diagrammatically blocking means according to a first variant embodiment,

FIGS. 11 and 12 show another alternative embodiment of the locking means,

FIGS. 13 to 16 schematically show opening means according to an advantageous embodiment, respectively before opening a reservoir, after it has been opened, during the entry of the air flow into the reservoir and during the exit air flow + powder out of the reservoir, - Figure 17 shows advantageous drilling and / or cutting means, FIG. 18 represents an alternative embodiment of the drilling and / or cutting means,

FIGS. 19 and 20 show two alternative embodiments of the opening means, the reservoir of FIG. 19 being in the open position; FIG. 21 diagrammatically represents in detail an advantageous variant of the mobile support means;

FIG. 22 diagrammatically shows in detail the means of reception of used tape,

FIGS. 23 and 24 diagrammatically show in detail two variants of dose indication means,

FIG. 25 schematically shows in detail means for flattening the empty tanks,

FIGS. 26 and 27 are views similar to FIG. 1 and respectively show two other embodiments of the dispensing device; FIG. 28 is a schematic perspective view of yet another embodiment of the invention;

FIG. 29 is a schematic perspective view of another variant embodiment of the drilling and / or cutting means,

FIG. 30 is a diagrammatic cross-sectional view of the drilling and / or cutting means of FIG. 29,

FIG. 31 is a view similar to that of FIG. 29, showing yet another alternative embodiment of the drilling and / or cutting means,

FIG. 32 is a diagrammatic cross-sectional view of the piercing and / or cutting means of FIG. 31; FIG. 33 is a partial diagrammatic cross-sectional view of still another embodiment of the triggering system; FIG. Inhalation, in position before inhalation,

FIG. 34 is a view similar to that of FIG. 33, after inhalation,

FIG. 35 is a diagrammatic cross-sectional view of the mobile support means, in the non-distribution position, FIG. 36 is a view similar to that of FIG. 35, in distribution position,

FIGS. 37 and 38 are diagrammatic views respectively in section and in perspective of rotation positioning means cooperating with the movable support means,

FIG. 39 is a diagrammatic cross-sectional view of an alternative embodiment of the diaphragm of FIGS. 33 and 34,

FIG. 40 is a detailed view of the diaphragm of FIG. 39,

FIG. 41 is a diagrammatic perspective view showing attachment of the mouthpiece to the body, according to a particular embodiment, and

- Figure 42 is a schematic sectional view showing an example of inhalation flow control means, in the inhalation position.

With reference to FIGS. 1 to 8b, there is shown a first embodiment of a dry powder inhaler. This inhaler comprises a central body 10 on which are slidably mounted two side portions 11, 12 forming a cover when the device is closed and adapted to be separated from one another to open the device and thus charge the device as will be described below. The body 10 may be approximately rounded in shape as shown in the figures, but it could have any other suitable shape. The body 10 comprises a mouthpiece or inhalation 15 through which the user will inhale during the actuation of the device. The two lateral parts 11, 12 forming a cover can open by pivoting about a common axis of rotation as shown in the figures, but any other opening means of the device is possible. Moreover, it could be provided only one movable cowl element 11 relative to the body 10, as shown in Figures 26 and 27.

Advantageously, the body comprises a window 19 through which the counting of the doses emitted or still to be transmitted can be displayed in a manner visible to the user. This window 19 may advantageously be provided on or close to the axis of rotation of the side portions 11, 12 forming the cover. Inside the body 10, there is provided a strip 20 of individual tanks 21, also called blisters, preferably an elongated strip 20 on which the blisters 21 are arranged one behind the other, in a known manner. These blisters 21 are not represented in the overviews of FIGS. 1, 5b, 6b, 7b, 8b, 26 and 27, so as not to overload these drawings for purposes of clarity, but they are visible in FIGS. 16 and 21 and 23. This blister strip 20 is advantageously constituted by a base layer or wall 22 forming the cavities 21 receiving the doses of powder, and a layer or closure wall 23 which sealingly closes each of said blister packs 21. The blister strip 20 can be wound inside the body 10 and band drive means 30 are provided to progressively unroll this blister strip and bring a respective individual reservoir or blister 21 into a dispensing position. each time the device is actuated. When an individual reservoir 21 has been emptied by inhalation, the band portion 35 comprising said empty reservoirs is advantageously adapted to wind up in another location of said body 10 as will be described in more detail below.

According to a first aspect of the inhaler, reservoir opening means 40 are provided in or integral with the body 10, these opening means 40 having means for piercing and / or cutting 41 of the closure layer of the blisters . Mobile support means 50 are also provided in the device, and are adapted to support a given reservoir, which is intended to be open during the next inhalation. These means of movable supports 50 are adapted to move the reservoir to empty against said piercing means and / or cutting 41 of the device during actuation. Advantageously, these movable support means 50 are biased by an elastic element 51, such as a spring or any other equivalent elastic element, said elastic element

51 can be preloaded when opening the device. Advantageously, the movable support means 50 are movable between a first position (non-dispensing position) and a second position (dispensing position) which is the open position of the reservoir. The movement between these first and second positions is advantageously performed along a curved direction. Referring more particularly to the exemplary embodiment shown on the Figures 1 to 8, we see that the movable support member 50 is secured to a rod 50 hinged relative to said body 10. A guide wheel 30 fixed on said rod 50 receives and guides the blisters. A rotation of this guide wheel 30 advances the blister strip 20. In a particular angular position, a given reservoir 21 is always in position to be opened by the opening means 40, that is to say the means Drilling and / or cutting 41. Advantageously, rotational positioning means 300 of said guide wheel 30 may be provided to precisely determine the angular position of said guide wheel 30 after each rotation. These positioning means 300 may, according to an advantageous variant shown in FIGS. 37 and 38, comprise a projection or finger 301 whose one end cooperates elastically with notches 38 provided around said guide wheel 30. Advantageously, the notches 38 comprise a V-shaped profile which automatically guides said finger 301 towards the central position of the notch, ensuring accurate angular positioning at each rotation. The guide wheel 30 preferably forms the tape drive means. Optionally, a complementary wheel 38 could be provided to help guide and / or drive the blister strip 20, as shown in FIG. 21. Said rod 50 can be connected to a second rod 55 so as to form a V, the tip of the V being formed by the pivot axis of the rod (s). The second rod, which can be fixed or pivotable, can support the elastic member 51, such as a spring, which also cooperates with an active element 57. Figures 5a to 8b show an operating cycle of the device. Figures 5a and 5b show the device in the rest position, closed. When opening the device (FIGS. 6a and 6b), the two lateral parts forming cover 11 and 12 are spaced apart from one another by pivoting on the body 10 to open the device. The active element 57 is then biased against the second rod 55 to compress and thus load the spring 51. In this position the rod 50 supporting the guide wheel 30 can not move in pivoting because it is retained by locking means 100 suitable (not shown in the overviews, but visible in Figures 9 to 12). It is during inhalation by the user to through the mouthpiece 15 (Figures 7a and 7b) that these locking means 100 will be unlocked, which will then cause the pivoting of said rod 50 and therefore of said guide wheel 30 towards the opening means 40, and therefore the opening of a reservoir 21 by said piercing means and / or cutting 41. The guide wheel 30 is fixed on a rod 50 pivoting about a pivot axis, the movement of the reservoir 21 is therefore in this mode realized in a curved direction. This curved direction during opening provides a particular advantage which will be described in more detail below.

Advantageously, abutment means 350 are provided to precisely determine the dispensing position of the guide wheel 30 after each inhalation. These abutment means may comprise a stud 350, as shown in FIGS. 35 and 36, adapted to cooperate in the dispensing position with one or more corresponding flat surfaces of the guide wheel 30. preferably, a flat surface is associated with each recess. In this example, this stop 350 contributes to the correct positioning in rotation of the guide wheel 30 at the moment when the piercing means and / or cutting penetrate into the reservoir. The stop 350 thus defines not only the depth of penetration of said piercing and / or cutting means in the reservoir, but also their centering with respect to the reservoir, in order to guarantee an optimal expulsion of the powder and a reproducibility of the high dose at each actuation. These abutment means 350 may be associated with the aforementioned rotational positioning means 300 so as to precisely predetermine each position of the guide wheel, in the non-dispensing position, in the dispensing position, and also during the movements of the guide wheel 30 between these positions. This avoids the risk of locking the device in case of misplacement of said guide wheel.

In the example shown, when the reservoir 21 moves towards its open position to be opened by the piercing and / or cutting means 41, these piercing and / or cutting means 41 are preferably fixed relative to the body. However, it is conceivable that these piercing means and / or cutting 41 can also be movable during the opening phase of the reservoir 21. For example, the cutting and / or drilling means 41 could move towards the reservoir 21 while the reservoir 21 moves in the direction Drilling and / or cutting means 41. In another variant, it could also be envisaged that the reservoir 21 and the piercing and / or cutting means 41 move in the same direction during actuation. moving more rapidly in this direction so that it comes into contact with said piercing and / or cutting means 41 to be open. As explained above, it is desirable that the actuation of the opening means is achieved by inhalation of the user. To effect this triggering by inhalation of the tank opening means, it is possible to provide an inhalation triggering system which advantageously comprises a unit 60 that can be displaced and / or deformable by inhalation, this unit 60 being suitable to release the blocking means 100.

This unit 60 advantageously comprises a deformable air chamber 61 cooperating with the blocking means 100 of said movable support means 50. The inhalation of the user causes the deformation of said deformable air chamber 61, thus making it possible to release said locking means 100 and thus unlocking the movable support means 50 to allow the displacement of the guide wheel 30 and a respective reservoir 21 to its open position. Advantageously, this air chamber 61 may comprise a deformable membrane, such as a bellows or bag 62, which can be connected on the one hand to the mouthpiece 15 and on the other hand to said blocking means 100 in a direct manner. or indirect. Thus, during inhalation, the bellows or bag 62 is deformed and contracted causing the displacement of said locking means 100 in an unlocking position. Alternatively, the bellows could be replaced by any deformable membrane.

The inhaler further comprises a dispensing chamber 70 which is intended to receive the dose of powder after opening a respective reservoir 21.

Advantageously, this distribution chamber 70 is provided with at least one ball 75 which moves inside said chamber 70 during inhalation, to improve the distribution of the air and powder mixture after opening a reservoir 21, in order to increase the efficiency of the device.

According to one particular variant, the deformable air chamber 61 co-operates with the distribution chamber 70. This distribution chamber 70 can thus be connected to the opening means 40 of the reservoir, and in particular to the piercing and / or cutting means. 41, and has a dispensing orifice 79. Optionally, this dispensing chamber 70 can be moved itself between a rest position and an inhalation position, so that when a user inhales through the mouthpiece 15, causing deformation of the deformable air chamber 61, the distribution chamber 70 moves from its rest position to its inhalation position. In this position of inhalation, the dispensing orifice 79 is placed in said mouthpiece 15, to ensure a good distribution of the dose, as shown in Figure 7a. In the example shown in FIGS. 2a, 2b, 5b to 8b, 26 and 27, the bellows 62 is thus connected on the one hand to the mouthpiece 15, and on the other hand to this distribution chamber 70, in the inhalation flow path of the user. As shown in the drawings, it may be advantageous if the opening means 40, in particular the piercing and / or cutting means 41, are formed directly on said distribution chamber 70, for example at the end of a channel 69, which leads to said chamber 70. In the same way, this distribution chamber 70, in its position of inhalation, can be adapted to release the blocking means 100 which held before the mobile support means 50 in the initial position, in order to allow these movable support means 50 to move the reservoir 21 to the open position.

After inhalation, as shown in FIGS. 8a and 8b, when the user closes the device, all the components return to their initial rest position, namely that the mobile support means 50 pivot with respect to their pivot axis 56 back to their first initial position away from the tank opening means 40, and the active element

57 cooperating with the preloadable spring 51 is also reduced in its initial rest position in which the spring 51 is not compressed. The device is then ready for a new cycle of use.

Other means of triggering by inhalation could also be used alternatively, for example by using a pivoting valve which, when the user inhales, pivots under the effect of the depression created by this inhalation, the pivoting of this valve causing the release of the locking means of the movable support means and thus the displacement of the reservoir towards the opening means.

FIG. 3 shows an alternative embodiment of the bellows 62, in which the bellows is not arranged directly between the mouthpiece 15 and the dispensing chamber 70, but housed in the main body 10 under the dispensing chamber 70. this embodiment, during inhalation, the bellows could even deform to inflate, and thus cause the displacement of the distribution chamber to its inhalation position, while in the embodiment described above the bellows is contracts during inhalation to pull the delivery chamber towards its inhalation position.

FIG. 4 shows another embodiment in which the bellows (or the membrane) is replaced by a piston 67 or the like sliding in a hollow sleeve 68 to deform the air chamber 61. The piston 67, which can be made under the shape of a thin plate may comprise a hole (not shown) to control the resistance to air flow. In the example shown, the piston 67 is integral with the dispensing chamber 70 and the sleeve 68 is integral with the mouthpiece 15, but the opposite is also conceivable.

FIGS. 33 and 34 show another alternative embodiment, in which a pocket or diaphragm 62 forms the air chamber 61. This pocket 62 is connected to the mouthpiece 15 via a channel 151 advantageously arranged around the expulsion channel 152 connected to the distribution chamber 70. The pocket 62 is attached to a rod connected to the blocking means 100, inhalation causing the deformation of the pocket 62 and thus the rod to move said means of blocking 100. FIGS. 39 and 40 show an alternative embodiment of the bag 62. This, advantageously made of silicone, may comprise a hem 620 adapted to form a seal with the body 10, for example between the body 10 and the 15. To do this, the hem 620 can be extended by a flange 625, also made of silicone, which will be compressed by a detent portion 1001 of the body 10 to seal, and in particular to avoid any loss charge in the inhalation flow.

Figure 41 shows a detail of the attachment of the portion forming the mouthpiece 15 on the body 10, according to a particular embodiment. The mouthpiece 15 may comprise a window 1500 cooperating with an inclined projection 1010 of the body 10. As, moreover, an upper portion 1011 of the body 10 is wedged by a shoulder 1501 of the mouthpiece 15, the inclined projection 1010 provides the sealing of the snap.

Figure 42 shows an alternative embodiment in which the pivoting rod 50 which supports the guide wheel 30 has an extension 501 which substantially closes a hole 1550 provided in the mouthpiece 15 in the inhalation position. Thus the inhalation flow, which before displacement of the guide wheel 30 and its rod 50 passes in part through the hole 1550, is after displacement of these elements and plugging the hole 1550, and therefore after opening the reservoir, mainly channeled to the emptying of said covered tank. It follows a better efficiency during inhalation which helps to ensure optimal emptying of the tank.

In another advantageous aspect of the inhaler, the individual reservoirs or blisters 21 are formed on an elongate strip 20, which is stored as a coil within the body 10 of the device. Advantageously, this wound blister strip 20 is held by internal walls of said body 10 without its "rear" end (in the direction of movement of the blister strip 20) being fixed relative to said body 10, which allows a easier assembly of this coil of blister strip inside the device. The blister strip 20 is displaced by the user advantageously by means of the guide wheel 30 which advantageously has at least one, of preferably several recesses 31 whose shape corresponds to that of the blisters. Thus, when this guide wheel 30 rotates, it drives the blister strip 20. No other drive system is required to move the blisters 21 during each actuation. Of course, alternatively or additionally, it is possible to use other means for advancing the blister strip, for example by providing a profile on the lateral longitudinal edges of the blister strip, said profile being adapted to cooperate with means of blistering. appropriate training. Similarly, holes along the lateral edges of the blister strip could also be used to advance the blister strip by means of toothed wheels cooperating with said holes.

The locking means 100 are intended to keep the mobile support means 50 in their initial position and to prevent the tank 21 from moving towards its open position until the user inhales. These blocking means 100 must be releasable safely and reliably and easily during the inhalation of the user, so that the displacement of the reservoir towards the opening means is achieved quickly, reliably and without requiring a too much effort. According to the exemplary embodiments shown in FIGS. 9 to 12, these blocking means 100 may comprise two elements 101, 102 interconnected one inside the other. A rotation according to the arrow B is applied to the second element 102 when an appropriate inhalation threshold is reached, the rotation of this second element 102 then causing the release of the first element 101, this first element 101 being moreover subjected to the load according to the arrow A movable support means 50, under the effect of the elastic member 51 which had been preloaded during the opening of the device. The first element

101 could be pivotally mounted about a pivot point 109 disposed between its two ends, a first end undergoing the load of the movable support means 50 according to the arrow A, and the other end cooperating with the second element 102. In this example, shown in Figures 9 and 10, when the second element 102 rotated according to the arrow B following inhalation, the end of the first element 101 which was blocked by the second element 102 therefore moves in a direction (arrow C) opposite the load (arrow A). Alternatively, shown in Figures 11 and 12, one could also use a rod or rotating bar 102 cooperating with a pin 101 exerting an axial force (arrow A) on said rod 102 when the device is preloaded. This rotary bar 102 advantageously has a shape suitable for allowing said loaded rod 101 to move freely in the direction A of the force exerted on it by the mobile support means 50 preloaded when said rotary bar 102 has rotated by a certain angle. . For example, as shown in FIG. 11, the rotating bar 102 has a lower portion 107 of greater diameter than the upper portion 108, so that after a rotation of

90 °, the shoulder 106 formed between these two parts 107 and 108 pushes the axial rod 101 so as to off-center it with respect to the central axis of the rotary bar 102, so that the axial rod 101 will slide along this rotating bar 102 and being able to move downwards in FIGS. 11 and 12 in the direction of the arrow A to allow the movable support means 50 to move towards the open position of the reservoir. Other embodiments are obviously conceivable to achieve the blockage and release this blockage during inhalation of the user.

According to yet another aspect of the inhaler, means for counting or indicating doses 120 are also provided. These means may either comprise numbers or symbols 125 written directly on the blister strip 20 and visible through an appropriate window 19 in the body 10 of the device. Alternatively, one could consider using a rotating disk 121 having the numbers or symbols 125, for example registered in spiral shape on the disk. In this case, a slider (not shown) with a suitable window could be engaged with a spiral track provided on that disc 121 to display the relevant numeral or symbol 125 for the current dose. Finally, indicators comprising rotating wheels, for example a wheel of the units and a wheel of tens could also be envisaged. Other variants are also conceivable, such as the use of two superimposed rotating discs, or a single disc with the numbers inscribed around its periphery.

After opening one or more blister (s), the portion of the blister strip 35 with the emptied tanks must be able to be stored in an easy and non-cumbersome manner in the device. Advantageously, this used blister strip 35 automatically winds on itself to form a coil again. Advantageously, the end of this used blister strip 35 (the "front" end of the blister strip 20) can be fastened to a rotary member or shaft 150 which accompanies each movement of the blister strip by turning a corresponding angle. This promotes the winding of the worn blister strip 35 on itself. Advantageously, this shaft 150 does not cause any traction or other driving force on the blister strip 20 but merely guides the rotation of its end to effect the winding of the used band portion 35. According to another Advantageous aspect of the inhaler, flattening means 160 used blisters can be used to flatten the blisters 21 once the dose they contained was emptied. This makes it possible to reduce the storage volume of the used blister strip 35. These flattening means 160 could consist of two cylinders between which the used blister strip 35 passes. These cylinders 160 could be smooth or have a suitable profile ( for example fluted, as shown in Figure 25) on their peripheral surface to provide optimum efficiency while requiring a minimum force to achieve this flattening used or empty blisters.

According to yet another aspect of the inhaler, the opening means 40 of the reservoirs 21 comprise drilling and / or cutting means 41. These piercing and / or cutting means 41 preferably have a suitable shape such that the cut wall portions 24 of the blister 21 bend inwardly of the blister without covering the openings 25 formed by these piercing and / or cutting means 41. FIGS. 13 to 16 show a cycle of opening and expulsion of the dose of a blister. Advantageously, these piercing and / or cutting means 41 comprise at least two opposite piercing ends. 42, 43 which are separated from each other by a suitable gap 44. These piercing and / or cutting means 41 advantageously create a central folding with cut wall portions 24 allowing the formed openings 25 not to all of which are covered by any portion of cut-out walls 24. Advantageously, as shown in FIGS. 13 to 17, each piercing end 42, 43 is cup-shaped and is formed by a partially cut hollow cylinder portion having sharp edges . Advantageously, the incoming air (arrow E) enters the open blister 21 outside said piercing and / or cutting means 41, as can be seen in FIG. 5. This can for example be obtained thanks to the fact that the means movable support 50 moves to the open position of the reservoir in a curved line. This movement along a curve causes one or more apertures slightly wider than the dimensions of the piercing and / or cutting element 41. This therefore allows the inhalation air to reach flow outside said piercing and / or cutting element 41 to penetrate inside the blister 21. If necessary, specific means for making an opening outside said piercing and / or cutting element 41 could also be provided, such as for example ribs 410 or any other appropriate external profile on said piercing element and / or cutting 41 (see Figures 29 to 32). Preferably, the outgoing air flow loaded with the powder (arrow S) emerges from the reservoir or blister 21 through the hollow interior of said piercing and / or cutting means 41, as shown in FIG. as shown in Fig. 18, both the incoming air flow (arrow E) and the outgoing air flow loaded with the powder (arrow S) could pass through respective hollow channels provided therein piercing and / or cutting means 41.

The specific shape of the piercing and / or cutting element 41 as shown in the figures provides a "Louvre" type cutout which provides all the above-mentioned advantages, and in particular which avoids that the holes created by the piercing are closed even partially by parts of walls pierced 24. This ensures a complete dump as possible of the blister

21, and thus provides maximum efficiency for the dispenser. Similarly, reproducibility of the assay is optimal, the same amount of powder being expelled each time thanks to the device of the invention.

Figures 29 and 30 show an alternative embodiment of the piercing element and / or cutting 41, wherein a central tip 420 separates the outside of the element into several channels, in this case four. External ribs

410 are provided at the outer edge to create side openings for entry of the inhalation flow into the reservoir.

FIGS. 31 and 32 show another alternative embodiment, quite similar to that of FIGS. 13 to 17, namely with two drill ends 42, 43 separated by a gap 44 adapted to accommodate at least partially the cut-off wall portion of the blister . Here, the openings are arranged back to back, unlike Figure 17 where they were facing each other. Advantageously, external ribs 410 are also provided at the outer edge.

Referring to Fig. 26, there is shown a second embodiment of the inhaler. This second embodiment differs mainly from the first embodiment of FIGS. 1 to 8 by the external shape of the device and by the different shape of the elastic means 51 making it possible to preload the device when it is opened. In this second embodiment, the body 10 has only one cover member 11 which is intended to open to load the device. During this opening, an elastic blade 51 is deformed by said cover member 11 which opens thereby providing the load that was provided by the spring 51 in the previous example. Again, this elastic blade 51 urges the movable support means 50 towards the open position of the reservoir in which the reservoir 21 is moved against the opening means 40, but appropriate locking means 100, such as those described previously or others, are provided to prevent this movement until the user inhales. The inhalation of the user unblocks said blocking means 100 and thus allows the opening of the reservoir 21 and the automatic dispensing of the dose it contains through the opening means 40, and its expulsion into the lungs of the user through the distribution chamber 70 provided upstream of the mouthpiece 15. The movable support means 50 may be made in the form of a deformable plastic part incorporating on the one hand the elastic blade 51, a biasing element 50 cooperating with the guide wheel 30, and one or two extension (s) 52, 53, adapted to cooperate with the body 10 to allow the loading of the elastic blade 51. In the example shown, a first extension 52 cooperates with a toothed wheel 200 can form a non-return ratchet and blister strip winding system 35. A second extension 53 can cooperate with the distribution chamber 70, or be connected in any way to the unlocking means 100. FIG. 27 shows another embodiment, which differs mainly from that of FIG. another form of resilient means 51 for preloading the device when opening the device. The shape of the body 10 of the inhaler is also slightly modified even if the difference is smaller than with respect to the first embodiment of FIGS. 1 to 8. The different form of the elastic means 51 making it possible to preload the device during the opening of the cover 11 differs slightly from that shown in the second embodiment but its function is strictly identical and therefore will not be further described here. In this particular example, the mobile support means 50 are integral with a resilient blade 51 deformed during the opening of the device, and a second piece 54, elastic or not, may be provided to achieve the winding of the strip of blister used 35 and / or the unlocking of the locking means 100. It should be noted that these locking means 100 are not shown in Figures 26 and 27, and that their actuation can be achieved in any suitable manner. FIG. 28 shows an external view of another advantageous embodiment of the inhaler, quite similar to those of FIGS. 1 to 8, and which differs in particular from a different shape of the mouthpiece 15.

In all the embodiments described above, the blister strip is formed by a band having two ends. Alternatively, a continuous band could be used. Other modifications are also possible without departing from the scope of the present invention. The present invention therefore makes it possible to provide a dry powder inhaler which notably provides the following functions:

A plurality of individual doses of powder stored in sealed individual reservoirs, for example 60 doses stored on a coil-wound web;

The powder released by means of a piercing actuated by the inhalation of the user, this piercing of the blister being carried out by means of an inhalation detection system coupled to a preloaded release system; "suitably shaped drive means engaged with the blisters for effecting movement of the blister strip upon each actuation, and bringing a new reservoir into a position in which it is to be opened by the appropriate opening means ^" A dose indicator mechanically linked to the movement of the blister strip.

Other functions are also provided by the device of the invention as previously described. It should be noted that the different functions, even if they were represented as provided simultaneously on the various embodiments of the inhaler, could be implemented separately from each other. In particular, the inhalation triggering mechanism could be used regardless of the type of tank opening means, regardless of the use of a dose indicator, regardless of how individual reservoirs are arranged relative to each other. others, etc. The arming means and the trigger system by inhalation could be made differently. It is the same of the other constituent parts of the device.

The inhaler of the invention, incorporating all or part of the functions described, is found to provide higher performance than existing devices. In particular, the inhaler of the invention provides a tank emptying rate of at least 90% at each actuation. Advantageously, this rate of emptying, corresponding to the percentage of the fluid product expelled out of an open reservoir during actuation of the device, is greater than 95%, preferably even greater than 97%. This high emptying rate is even greater than the performance obtained with active inhalers which are generally more effective than passive inhalers, and in which it is not the inhalation flow that empties the blister and expels the dose but a compressed air flow released at the time of inhalation. It guarantees maximum efficiency of the device of the invention. Coupled with the opening triggered by inhalation, this high emptying rate guarantees an optimal distribution of the fluid product, in this case the powder, in the lungs of the user. The table below illustrates measurements made with a Budesonide / lactose mixture at 1.17% by weight, with various flow rates corresponding to typical flow rates of inhalation. Thus, three measurements were made with respective flow rates of about 7.5 l / min, 101 / min and 15 l / min. The measurements consisted in measuring the quantity of powder remaining in the blister after emptying by the air flow, and therefore, by comparing with the quantity of powder introduced into the blister, the emptying rate thereof. These measurements demonstrate the very high efficiency of the device of the invention, the emptying rate in this example being systematically at least equal to 97%.

Furthermore, the invention also provides a better regular emptying tanks during successive actuations. So, by referring by example to 10 tanks of a blister strip, it turns out that the emptying rate varies from less than 15%, preferably less than 10%, preferably less than 5% from one tank to another. This better regularity guarantees a better reproducibility of the dose and therefore also a better efficiency of the device of the invention.

Various modifications are also possible for a person skilled in the art without departing from the scope of the present invention as defined by the appended claims.

Claims

claims

1.- Device for dispensing fluid product, in particular dry powder inhalation, comprising a plurality of individual reservoirs (21) each containing a single dose of fluid, such as powder, said reservoirs (21) being made in the form of an elongated strip (20), opening means (40) being provided for opening a reservoir at each actuation, characterized in that said device comprises band receiving means for receiving the band portion ( 35) supporting the empty tanks, said receiving means comprising a rotatable member (150) attached to the front end of said tank strip (20).

2.- Device according to claim 1, wherein said rotary member (150) is connected to drive means (30) of the tank strip (20).

The device of claim 2, wherein said tape drive means comprises a rotatable guide wheel (30).

4.- Device according to claim 3, wherein the rotation of the guide wheel (30) is performed manually by the user.

5.- Device according to any one of the preceding claims, wherein said rotary member (150) exerts only a guide action in rotation of the end of the reservoir strip (20) without exerting any traction on said strip.

6. A device according to any one of the preceding claims, wherein said tank band portion (35) supporting the empty tanks winds in the form of a coil in a storage space.

7. A device according to any one of the preceding claims, wherein the empty tanks are flattened by a flattening device (160) before being stored in a storage space.

8.- Device according to any one of the preceding claims, wherein said opening means (40) comprise piercing means and / or cutting (41) adapted to cut a closure wall (23) of the reservoir (21). ) so that the cutout portion (s) (24) does not obstruct (s) the aperture (s) formed (25).

9. A device according to any one of the preceding claims, comprising a dose indicator (120) to indicate to the user the number of doses dispensed or remaining to be dispensed.