DRY POWDER INHALER

Abstract

A dry powder inhaler includes an inhalation channel connected to a mouthpiece, a container for storing a powdered medicament, a de-agglomerator with a vortex chamber located at an end of the inhalation channel, a metering device including a shuttle having a dosing recess. The shuttle is movable between a filling position, in which the dosing recess is in alignment with an opening of the container, and an inhalation position, in which the dosing recess is in alignment with the vortex chamber. The opening of the container is elongated along a major axis and the dosing recess is elongated along a main axis and, when the shuttle is in the filling position, an edge of the opening of the container encloses the dosing recess.

Claims

1. A dry powder inhaler, comprising: a casing having a mouthpiece; an inhalation channel housed in the casing and connected to the mouthpiece; a container housed in the casing for storing a powdered medicament, the container having an opening; a de-agglomerator having a vortex chamber located at an end of the inhalation channel opposite the mouthpiece; and a metering device comprising a shuttle having a dosing recess formed in a face of the shuttle, wherein the shuttle is movable between a filling position, in which the dosing recess is in alignment with the opening of the container and faces said opening to be filled with a dose of the powdered medicament, and an inhalation position, in which the dosing recess is in alignment with the vortex chamber and the inhalation channel, for enabling inhalation of the dose of the powdered medicament contained in the dosing recess through the mouthpiece; wherein, in a top view, the opening of the container is elongated along a respective major axis and the dosing recess is elongated along a respective main axis; and wherein, when the shuttle is in the filling position, an edge of the opening of the container encloses the dosing recess.

2. The inhaler of claim 1, wherein a direction of movement of the shuttle between the filling position and the inhalation position and said major axis delimit between them an angle of 90 and said main axis and the major axis delimit between them a first angle other than 0.

3. The inhaler of claim 2, wherein said first angle is between 10 and 30.

4. The inhaler of claim 1, wherein the de-agglomerator has two air inlets opening in the vortex chamber, said two air inlets being placed on opposite sides of the vortex chamber and along tangential or substantially tangential inflow directions to form an air vortex in said vortex chamber; in the inhalation position, the dosing recess faces the vortex chamber and is fully enclosed in the vortex chamber; the dosing recess has opposite ends located along the main axis; and in the inhalation position, each of the opposite ends of the dosing recess is next to one of the air inlets.

5. The inhaler of claim 4, wherein a first diametrical line connecting the two air inlets and the main axis delimits between them a second angle other than 0.

6. The inhaler of claim 5, wherein the de-agglomerator comprises two curved walls having concavities facing each other, the two curved walls being staggered from each other and delimiting the vortex chamber and the two tangential air inlets; and a second diametrical line passing through a free extremity of each of the curved walls and the main axis delimits between them a second angle other than 0.

7. The inhaler of claim 6, wherein the second diametrical line is parallel to the major axis and the first angle is equal to the second angle.

8. The inhaler of claim 4, wherein each of the opposed ends of the dosing recess is located downstream of the respective air inlet with respect to an air inflow entering through said air inlet.

9. The inhaler of claim 5, wherein the vortex chamber is configured to form a clockwise air vortex and the main axis is rotated clockwise with respect to the first diametrical line; or the vortex chamber is configured to form a counterclockwise air vortex and the main axis is rotated counterclockwise with respect to the first diametrical line.

10. The inhaler of claim 6, wherein in the inhalation position, the dosing recess is contained within a base circle having a diameter given by a segment extending between the free extremities of the two curved walls.

11. The inhaler of claim 1, wherein the edge of the opening of the container is substantially elliptical; or the edge of the opening of the container has two major arched sides and two minor straight sides.

12. The inhaler of claim 1, wherein a perimeter of the dosing recess comprises two parallel straight lines connected by two arcs and the two parallel straight lines are parallel to the main axis; or the perimeter of the dosing recess is oval or an ellipse and the main axis is a major axis of the ellipse.

13. The inhaler of claim 1, wherein the dosing recess has a capacity for the powdered medicament greater than 10 mg.

14. The inhaler of claim 1, wherein the dosing recess has a length (L) measured along the main axis and a width (W) measured perpendicular to the main axis; and a ratio L/W is greater than 1.

15. The inhaler of claim 1, further comprising a protective member provided between the shuttle and the vortex chamber, wherein: when the shuttle is in the inhalation position, the protective member is slidingly movable on or above the shuttle between a closed position and an open position; in the closed position, the protective member fully covers the dosing recess preventing communication between said dosing recess and the vortex chamber; and in the open position, the protective member leaves the dosing recess exposed to the vortex chamber.

16. The inhaler of claim 1, comprising the powdered medicament, wherein said powdered medicament is a pharmaceutical composition comprising one or more phosphodiesterase-4 (PDE-4) inhibitors selected from the group consisting of tanimilast, cilomilast, roflumilast, tetomilast, oglemilast, apremilast, piclamilast and a salt thereof.

17. The inhaler of claim 16, wherein the phosphodiesterase-4 (PDE-4) inhibitor is tanimilast.

18. A dry powder inhaler, comprising: a casing with a mouthpiece; an inhalation channel housed in the casing and connected to the mouthpiece; a container housed in the casing for storing a medicament, the container having an opening; a vortex chamber located at an end of the inhalation channel, opposite the mouthpiece; and a shuttle with a dosing recess, the shuttle being movable between a filling position, where the dosing recess aligns with the opening and faces the opening to be filled with a medicament dose, and an inhalation position, in which the dosing recess is in alignment with the vortex chamber and the inhalation channel, for enabling inhalation, through the mouthpiece, of the medicament dose filling the dosing recess; wherein, in a top view, the opening is elongated along a major axis of the opening and the dosing recess is elongated along a main axis of the dosing recess; and wherein, when the shuttle is in the filling position, an edge of the opening encloses the dosing recess.

19. A method of treatment of a patient with a respiratory disease, the method comprising administering to the patient a powdered medicament to provide a delivered dose of the powdered medicament greater than 10 mg, the administering performed through the inhaler according to claim 1.

20. The method of treatment of claim 19, wherein the powdered medicament is a pharmaceutical composition comprising one or more phosphodiesterase-4 (PDE-4) inhibitors selected from tanimilast, cilomilast, roflumilast, tetomilast, oglemilast, apremilast, piclamilast and a salt thereof.

21. The method of treatment of claim 20, wherein the administered phosphodiesterase-4 (PDE-4) inhibitor is tanimilast.

22. A method to treat a patient, the method comprising administering to the patient, through the inhaler of claim 1, a powdered medicament in an effective amount for treatment of a respiratory disease.

23. The method of claim 22, wherein the powdered medicament comprises tanimilast.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0083] FIG. 1 shows a 3D view of a dry powder inhaler according to the present disclosure in an open configuration;

[0084] FIGS. 2A, 2B and 2C are section views of the dry powder inhaler of FIG. 1 in different states;

[0085] FIG. 3 is an exploded view of some components of the dry powder inhaler of FIG. 1;

[0086] FIG. 4 shows a 3D view of one of the components of FIG. 3;

[0087] FIGS. 5A and 5B are top views of the component of FIG. 4 in different states;

[0088] FIG. 6 shows a 3D top view of another component of FIG. 3;

[0089] FIG. 7 shows a 3D bottom view of the component of FIG. 6;

[0090] FIG. 8 shows a section view of the component of FIG. 6;

[0091] FIG. 9 is an enlarged top view of a portion of FIG. 5B;

[0092] FIG. 10 is an enlarged top view of another portion of FIG. 5A.

DETAILED DESCRIPTION

[0093] With reference to the appended drawings, FIGS. 1, 2A, 2B, 2C show an embodiment of a dry powder inhaler 1 according to the present disclosure. The dry powder inhaler 1 of these non-limiting examples may be similar to the inhalers disclosed in document WO 2004/012801, WO 2016/000983 and WO 2021/105440 or in paper Expert Opin. Drug Deliv. (2014) 11(9), 1497-1506 by Corradi M. et al. by the same Applicant.

[0094] The dry powder inhaler 1 comprises a casing 2 and a cover 3 being pivotably or rotatably coupled to the casing 2. As can be taken from FIG. 1, the cover 3 can be opened to reveal a mouthpiece 4 through which a user can inhale a powdered medicament. At an upper front side of the mouthpiece 4, air intake openings 5 are formed in the casing 2.

[0095] The casing 2 is a closed shell made of thermoplastic materials (e.g. ABS and polycarbonate) and comprises lateral sides, an upper side and a lower side (upper and lower with respect to the orientation of the powder inhaler 1 of FIGS. 1, 2A-2C).

[0096] The mouthpiece 4 protrudes from the upper side and has an external shape of truncated cone tapering towards an opening 6 fashioned in a top portion (smaller base) of the mouthpiece 4.

[0097] The cover 3 is hinged to the casing 2 and can be rotated between a closed position, shown in FIG. 2A, in which the cover 3 encloses the mouthpiece 4, and an open position, shown in FIGS. 1, 2B and 2C, in which the cover 3 is spaced from the mouthpiece 4 to expose said mouthpiece 4 for use.

[0098] The powder inhaler 1 comprises a container 7 for storing a powdered medicament, an inhalation channel 8 connected to the opening 6 of the mouthpiece 4 and a dispensing device 9 (FIG. 2). The inhalation channel 8 has a first opening connected to the mouthpiece 4 and a second opening, opposite with respect to the first opening. All these elements are part of sub-assembly 10, shown in FIG. 3, housed inside the casing 2.

[0099] As is shown in FIGS. 2A-2C, the container 7 is a container with integral desiccant.

[0100] The container 7 comprises a medicament chamber 11 storing the powdered medicament and a desiccant chamber 12 storing a desiccant for absorbing moisture that may have entered the medicament chamber 11.

[0101] The desiccant chamber 12 is separated from the medicament chamber 11 by a separate permeable membrane 13. This permeable membrane 13 is of a different permeability than the permeability between either the desiccant or the medicament to the outside environment. The permeability of the membrane 13 can be achieved, for example, by making it of a different material and/or a thinner section than the main body of the container 7. Foils may be used to seal both the medicament chamber 11 and the desiccant chamber 12. The container 7, in particular the medicament chamber 11, is filled or is configured to be filled with an amount of powdered medicament corresponding to a plurality of doses, e.g. up to 100-200 doses. For instance, the powdered medicament is a pharmaceutical composition.

[0102] The desiccant is contained in a housing able of being inserted in the desiccant chamber 12 or the desiccant is in the form of a single tablet able of being inserted in the desiccant chamber 12. The desiccant is or comprises molecular sieves made of a material with pores of uniform size, for instance alkaline salts of aluminosilicates, called zeolites, or aluminophosphates or porous glass or active carbon or artificial zeolites. The molecular sieves are configured to absorb small molecules such as molecules of water. The desiccant may also be a silica gel.

[0103] The dispensing device 9 comprises a metering device 14 having a dosing recess 15. The metering device 14 shown in the attached Figures comprises a shuttle 16 shaped like a plate and provided with said dosing recess 15 which is formed or fashioned in a face of the shuttle 16.

[0104] The dispensing device 9 is movable, with respect to the container 7 and with respect to the inhalation channel 8, between an idle state (FIG. 2A), in which a dosing recess 15 is in communication with an opening 17 of the container 7 so as to be filled with a dose of the powdered medicament, and a triggered state (FIG. 2C), in which the dosing recess 15 is in communication with the inhalation channel 8 for enabling inhalation of the dose of the powdered medicament contained in the dosing recess 15 through the mouthpiece 4.

[0105] The medicament chamber 11 is at least in part shaped like a hopper having walls converging towards the opening 17, as visible in FIGS. 2A, 2B, 2C, 3 and 5.

[0106] The shuttle 16 is placed between the sub-assembly 10 and a bottom wall of the casing 2. The shuttle 16 is shaped like a plate made of a single piece of plastic, e.g. acrylonitrile butadiene styrene copolymer (ABS).

[0107] The shuttle 16 is slidingly moveable between a filling position (FIG. 2A) and an inhalation position (FIGS. 2B and 2C) along a direction of movement F. The filling position corresponds to the idle state of the metering device 14, in which the dosing recess 15 is in alignment with the opening 17 of the container 7 and faces said opening 17 so as to be filled with the dose of the powdered medicament. The inhalation position corresponds to an armed state (FIG. 2B) which will be detailed later and to the triggered state (FIG. 2C) of the metering device 14, in which the dosing recess 15 is in alignment with the inhalation channel 8.

[0108] The shuttle 16 is mechanically coupled to the cover 3 such that an opening of the cover 3 beyond a range of rotational movement from the closed position causes the shuttle 16 to move from the filling position to the inhalation position. Closing of the cover 3 causes the shuttle 16 to move back from the inhalation position to the filling position.

[0109] As shown in FIGS. 2A, 2B and 2C, a spring 36 is interposed between a bottom wall of the casing 2 and the shuttle 16 and is configured to push said shuttle 16 against the opening 17 of the container 7 when the shuttle 16 is in the filling position. The shuttle 16 slides with respect to the spring 36 when moving between the filling position and the inhalation position.

[0110] The metering device 14 further comprises a protective member 18 provided between the shuttle 16 and the inhalation channel 8. The protective member 18 is a plate arranged between the second opening of the inhalation channel 8 and the shuttle 16. The protective member 18 is parallel with respect to the shuttle 16 and is slidingly movable on or above the shuttle 16 between a closed position and an open position.

[0111] In the closed position, the protective member 18 is shifted backwards towards the second opening of the inhalation channel 8 and towards the container 7. In the closed position, a rear part of the protective member 18 may at least in part close the second opening of the inhalation channel 8. In the open position, the protective member 18 is shifted forward towards a wall of the casing 2. In the open position, a rear part of the protective member 18 leaves the second opening of the inhalation channel 8 open. The protective member 18 is in the closed position when the shuttle 16 is in the filling position (FIG. 2A). The protective member 18 may be moved between the closed position and the open position when the shuttle 16 is in the inhalation position (FIGS. 2B and 2C).

[0112] Therefore, the metering device 14 is configured to take the three different states cited above (idle, armed, triggered) and these states are determined by the positions of the shuttle 16 and of the protective member 18.

[0113] In the idle state (FIG. 2A), the shuttle 16 is in the filling position and the protective member 18 is in the closed position. The protective member 18 does not cover the dosing recess 15. The dosing recess 15 is communication with the opening of the container 7 to receive the medicament dose. In the armed state (FIG. 2B), the shuttle 16 is in the inhalation position and the protective member 18 is in the closed position. The protective member 18 covers the dosing recess 15. The protective member 18 prevents the powdered medicament contained in the dosing recess 15 from entering the inhalation channel 8 and being lost in case of rotation or movement of the powder inhaler 1 in oblique position before the inhalation maneuver or if the user blows into the mouthpiece 4. In the triggered state (FIG. 2C), the shuttle 16 is in the inhalation position and the protective member 18 is in the open position. The protective member 18 does not cover the dosing recess 15, thereby exposing the dosing recess 15 to the inhalation channel 8 so as to enable a user to inhale the dose of the powdered medicament contained in the dosing recess 15.

[0114] The dispensing device 9 further comprises a breath or inhalation actuated mechanism 19 coupled to the protective member 18 (FIGS. 2A, 2B, 2C). The inhalation actuated mechanism 19 comprises an inhalation actuated member 20 shaped like a flap, a coupling member 21 and a resilient element 22 (spring) arranged on the coupling member 21.

[0115] The flap 20 is coupled to the protective member 18 through the coupling member 21 such that, if there is an inhalation suction force exceeding a predetermined value, the flap 20 is moved from a first position to a second position, thereby causing the protective member 18 to move from the closed position to the open position. The flap 20 is placed inside the casing 2 and close to the air intake openings 5. In the first position (FIG. 2A), the flap 20 separates the air intake openings 5 from the inhalation channel 8 and seats in a main airflow path. The flap 20 provides a resistance if the user blows into the device giving positive feedback. In the second position, (FIG. 2C) the flap 20 is rotated with respect to the first position to open the air intake openings 5 and to allow air flowing through the air intake openings 5 into the inhalation channel 8 and out of the mouthpiece 4. The resilient element 22 is arranged such that said resilient element 22 holds the flap 20 in its first position. When the shuttle 16 is pushed forward by opening the cover 3, the resilient element 22 is compressed and charged and the reset force exerted on the flap 20 is released, so that the flap 20 can pivot or rotate from the first position into the second position that is pivoted downward relative to the first position if there is a sufficient high inhalation suction force in the inhalation channel 8.

[0116] The flap 20 is hinged to the casing 2 in order to rotate between the first position and the second position around a respective rotation axis which is substantially perpendicular to a main axis A-A of the inhalation channel 8. The coupling member 21 is also hinged to the casing 2 in order to rotate between a respective first position and second position around a respective rotation axis which is substantially perpendicular to the main axis A-A of the inhalation channel 8.

[0117] The coupling member 21 comprises an arm, not shown, protruding towards the flap 20 and engaged with the flap 20 such that the clockwise rotation of the flap 20 from the first position to the second position causes a counterclockwise rotation of the coupling member 21 from its respective first position towards its respective second position.

[0118] The coupling member 21 comprises a prolongation 23 engaging with an opening formed in the protective member 18 in order to move the protective member 18 from the closed position to the open position when the coupling member 21 moves from its respective first position to its respective second position and vice-versa.

[0119] The prolongation 23 of the coupling member 21 is also moveably arranged in a longitudinal opening 24 which is formed in the shuttle 16 along its longitudinal direction, such that said prolongation 23 can freely move in the longitudinal opening 24, while a movement of the shuttle 16 from the inhalation position to the filling position causes the prolongation 23 of the coupling member 21 to abut against an edge of the longitudinal opening 24 thereby moving the coupling member 21 back into its initial first position.

[0120] The dry powder inhaler 1 further comprises a de-agglomerator 25 that is coupled to the second end of the inhalation channel 8 opposite the mouthpiece 4. Also the de-agglomerator 25 is part of the sub-assembly 10.

[0121] The de-agglomerator 25 delimits a vortex chamber 26 and is constructed such that it generates a cyclonic airflow resulting in a strong velocity gradient. The protective member 18 is slidable on the shuttle 16 between its closed position, in which is covers the dosing recess 15, and its open position, in which it exposes the dosing recess 15 to the de-agglomerator 25 and the inhalation channel 8 when the metering member 14 is in the inhalation position, so that the dose of the powdered medicament can be inhaled through the de-agglomerator 25 and the inhalation channel 8 as well as the mouthpiece 4.

[0122] The powder inhaler 1 may also comprise a dose counting unit, not shown in the embodiment of the attached drawings, contained into the casing 2 and coupled both to the inhalation actuated mechanism 19 and to the closure of the cover 3 after an efficacious inhalation has occurred. The casing 2 may also comprise a window or an opening for displaying the number of doses taken or the number of doses left in the container 7, this number being counted by the dose counting unit.

[0123] As shown in the top views of FIGS. 5A, 5B and 9, the opening 17 of the container 7 is elongated along a major axis Y-Y and said major axis Y-Y is perpendicular to the direction of movement F of the shuttle 16. In other words, the opening 17 has a size measured along said major axis greater than a size measured along the direction of movement F of the shuttle 16.

[0124] An edge 27 of the opening 17 lies in a plane parallel to the face of the shuttle 16 in which the dosing recess 16 is fashioned (FIGS. 3, 5A, 5B, 9). The edge 27 is formed by two major arched sides 17a and two minor straight sides 17b. The two minor straight sides 17b present a same length and are parallel to the direction of movement F of the shuttle 16. Each of the two major arched sides 17a connects extremities of the two minor straight sides 17b. The two major arched sides 17a have concavities facing each other. The edge 27 of the opening 17 looks like an oval with truncated ends.

[0125] In other embodiments, not shown, the edge 27 of the opening 17 may be elliptical or substantially elliptical.

[0126] The de-agglomerator 25 comprises a casing 28 (see FIG. 3) having lateral walls 29 and a base wall 30 and the vortex chamber 26 is delimited inside said casing 28.

[0127] As shown in FIGS. 4, 5A, 5B and 10, the de-agglomerator 25 comprises two curved walls 31 protruding from the base wall 30 of the sub-assembly 10. The two curved walls 31 have concavities facing each other and delimit the vortex chamber 26. Each curved wall 31 has a thickness t and is shaped like a hemi-circumference having a radius R. The centers of the two curved walls 31 are located on a common diametrical line Z-Z and are staggered from each other of a distance (FIG. 10). The diametrical line Z-Z is perpendicular to the direction of movement F of the shuttle 16 and therefore parallel to the major axis Y-Y.

[0128] The two curved walls 31 extend from the base wall 30 and surround or delimit a through opening 32 fashioned in said base wall 30 (FIGS. 2A, 2B, 2C).

[0129] Each of the two curved walls 31 has an extremity connected to a respective lateral wall 29 and an opposite free extremity 33. A diameter d given by a segment extending between the free extremities 33 of the two curved walls 31 may be considered as the diameter of the vortex chamber 26.

[0130] Each free extremity 33 and an adjacent lateral wall 29 delimit an air inlet 34 which opens in the vortex chamber 26. The two air inlets 34 are placed on opposite sides of the vortex chamber and along tangential or substantially tangential inflow directions to form an air vortex in said vortex chamber 26. In other words, the airflow entering through each of the two air inlets 33 is directed tangentially with respect to a circle centered in the vortex chamber 26.

[0131] A width p of each air inlet 34 measured along the segment extending between the free extremities 33 of the two curved walls 31 is between d/6 and d/4, e. g. the width p is d/5.

[0132] The relations between the radius R, the distance , the width p, the diameter d and the thickness t are the following:

=t+p

d=2R

[0133] Hollows 35 delimited between the lateral walls 29 and radially external surfaces of the two curved walls 31 can be put in fluid communication with the air intake openings 5 through the breath or inhalation actuated mechanism 19.

[0134] As shown in FIGS. 2A, 2B and 2C, the second end of the inhalation channel 8, opposite the mouthpiece 4, is placed between the two curved walls 31 and opens into the vortex chamber 26. The inhalation channel 8 and the vortex chamber 26 share a common central axis.

[0135] When the user exerts the inhalation suction force exceeding the predetermined value, the protective member 18 moves from the closed position to the open position. In the open position the protective member 18 leaves the dosing recess 15 exposed to the vortex chamber 26. The air flows through the air intake openings 5, into the hollows 35, through the air inlets 34, into the vortex chamber 26 and then into the inhalation channel 8 and out of the mouthpiece 4. The dose of powdered medicament housed in the dosing recess 15 is entrained in the swirling air flow and directed to the mouthpiece 4 through the inhalation channel 8.

[0136] As it is evident from the above, the internal mechanisms and functioning of the powder inhaler 1 disclosed above may be substantially the same as those disclosed in documents WO 2004/012801, WO 2016/000983 or WO 2021/105440 by the same Applicant.

[0137] The main difference with respect to these documents is the shape, size and positioning of the dosing recess 15, as will be detailed below.

[0138] According to the present disclosure, as shown in the top views of FIGS. 5A, 5B, 6 and 9, the dosing recess 15 does not present a circular perimeter. Differently, the dosing recess 15 of the present disclosure is elongated along a respective main axis X-X. The dosing recess 15 may be cup shaped.

[0139] The shape of the perimeter of the dosing recess 15 may be oval or elliptical and the main axis X-X is a major axis of the ellipse. Otherwise, as shown in the attached FIGS. 5-9, the perimeter of the dosing recess 15 comprises two parallel straight lines connected by two arcs and the two parallel straight lines are parallel to the main axis X-X. The two arcs of the perimeter of the dosing recess 15 define opposite ends of the dosing recess 15 located along the main axis X-X. The dosing recess has a length L measured along the main axis X-X and a width W measured perpendicular to the main axis X-X and a ratio L/W is greater than 1, preferably between 1.4 and 1.8, e.g. of 1.6.

[0140] Furthermore, the main axis X-X and the major axis Y-Y delimit between them a first angle other than 0. Said first angle may be of about 20.

[0141] The size of the perimeter of the dosing recess 15 is such that, when the shuttle 16 is in the filling position, the edge 27 of the opening 17 of the container 7 encloses the dosing recess 15 or, in other words, the perimeter of the dosing recess 15 is surrounded by or enclosed within the edge 27 of the opening 17, as shown in FIG. 9. This way, the dosing recess 15 is completely filled by the powdered medicament flowing from the opening 17.

[0142] This shape of the dosing recess 15 allows to receive from the opening 17 of the container 7 and to house a dose of powdered medicament greater than the dose contained in the spherical cup shaped dosing recess of the prior art. For instance, the length L is between 8 and 12 mm, the width W is between 4 mm and 6 mm and the capacity of the dosing recess 15 according to the present disclosure is greater than 15 mg and is, for instance, of 20 mg. For instance, the dosing recess 15 may have a volume of greater than 20 mm.sup.3, for instance about 30 mm.sup.3 or about 32 mm.sup.3.

[0143] In the inhalation position and when the protective member 18 is in the open position, the dosing recess 15 faces the vortex chamber 26 and is fully in the vortex chamber 26. In particular, the dosing recess 15 is contained within the base circle having the diameter d (FIG. 10). The diametrical line Z-Z passing through the free extremity 33 of each of the curved walls 31 and connecting the two air inlets 34 delimits with the main axis X-X a second angle which is equal to the first angle , i.e. other than 0, for instance of 20.

[0144] Each of the opposite ends of the dosing recess 15 is next/close to one of the air inlets 34 and is located downstream of the respective air inlet 34 with respect to an air inflow entering through said tangential air inlet 34. In the illustrated embodiment, the vortex chamber 26 is configured to form a clockwise air vortex and the main axis X-X is rotated clockwise of the second angle with respect to the diametrical line Z-Z. In other embodiments, not shown, the vortex chamber 26 may be configured to form a counterclockwise air vortex and the main axis X-X would be rotated counterclockwise with respect to the diametrical line Z-Z.

[0145] When the shuttle 16 is in the inhalation position, a first minimum distance s.sub.1 between the perimeter of the dosing recess 15 and the curved walls 31 is between d/12 and d/8, e.g. the first minimum distance s.sub.1 is d/10. In the attached FIG. 10, the first minimum distance s.sub.1 is measured along the diametrical line Z-Z.

[0146] When the shuttle 16 is in the filling position, a second minimum distance s.sub.2 between the perimeter of the dosing recess 15 and the edge 27 of the opening 17 of the container 7 is between d/12 and d/8, e.g. the second minimum distance s.sub.2 is d/10.

[0147] A ratio L/d is between 0.8 and 0.95, e.g. of 0.9 and a ratio W/d is between 0.4 and 0.8, e.g. of 0.6. In the attached FIG. 9, the second minimum distance s.sub.2 is between one of the two major arched sides 17a of the edge 27 and one of the two arcs of the perimeter of the dosing recess 15.

[0148] The shape and position of the dosing recess 15 with respect to the vortex chamber 26, when the shuttle 16 is in the inhalation position and the protective member 18 is in the open position, ensure a complete emptying of the dosing recess 15 thanks to the air swirling in the vortex chamber 26. The elongated shape of the dosing recess 15 and its relative position with respect to the air inlets 34 of the vortex chamber 26 allow to collect all the powdered medicament from the dosing recess 15 and to route said powdered medicament into the inhalation channel 8.

[0149] Furthermore, a width of the protective member 18 measured along the major axis Y-Y is greater than a size of the dosing recess 15 measured along said major axis Y-Y and a length of the protective member 18 measured along the direction of movement F is greater than a size of the dosing recess 15 measured along said direction of movement F, such that any leak of powdered medicament from the dosing recess 15 and before the inhalation is prevented.

[0150] The dry powder inhaler 1 according to the present disclosure may be used with all pharmaceutical compositions that can be dispensed through DPIs with a delivered dose greater than 10 mg per actuation.

[0151] In particular, the dry powder inhaler 1 according to the present disclosure may be used in the treatment of respiratory diseases wherein a delivered dose of a pharmaceutical composition greater than 10 mg per actuation is required.

[0152] In a preferred embodiment, the powdered medicament stored in the container 7 of the dry powder inhaler 1 according to the present disclosure is a pharmaceutical composition comprising one or more phosphodiesterase-4 (PDE-4) inhibitors selected from the group consisting of tanimilast, cilomilast, roflumilast, tetomilast, oglemilast, apremilast, piclamilast and a salt thereof or other suitable active ingredients. In a more preferred embodiment, the powdered medicament is a pharmaceutical composition comprising tanimilast.

LIST OF PARTS

[0153] powder inhaler 1 [0154] casing 2 [0155] cover 3 [0156] mouthpiece 4 [0157] air intake openings 5 [0158] opening 6 of the mouthpiece [0159] container 7 [0160] inhalation channel 8 [0161] dispensing device 9 [0162] sub-assembly 10 [0163] medicament chamber 11 [0164] desiccant chamber 12 [0165] permeable membrane 13 [0166] metering device 14 [0167] dosing recess 15 [0168] shuttle 16 [0169] opening 17 of the container [0170] major arched sides 17a [0171] minor straight sides 17b [0172] protective member 18 [0173] breath or inhalation actuated mechanism 19 [0174] inhalation actuated member or flap 20 [0175] coupling member 21 [0176] resilient element 22 [0177] prolongation 23 [0178] longitudinal opening 24 [0179] de-agglomerator 25 [0180] vortex chamber 26 [0181] edge 27 of the opening [0182] casing 28 [0183] lateral walls 29 [0184] base wall 30 [0185] two curved walls 31 [0186] through opening 32 [0187] free extremity 33 of the lateral wall [0188] air inlets 34 [0189] hollows 35 [0190] spring 36 [0191] direction of movement F of the shuttle [0192] major axis Y-Y [0193] main axis X-X [0194] first angle [0195] second angle [0196] distance [0197] first minimum distance s.sub.1 [0198] second minimum distance s.sub.2