Suction nozzle assembly of dry powder inhalation inhaler and dry powder inhalation inhaler

Abstract

The utility model relates to a suction nozzle assembly of a powder inhalation inhaler and the powder inhalation inhaler, the suction nozzle assembly comprises an air channel and a plurality of first protruding parts, one end of the air channel is connected with a capsule bin of the powder inhalation inhaler, and the other end of the air channel is an outlet of a suction nozzle of the powder inhalation inhaler; medicine powder and airflow in the capsule bin pass through the air channel and are discharged from the outlet; the first protruding parts are arranged on the inner wall of the air channel in a protruding mode. The first protruding part can collide with the medicine powder. According to the suction nozzle assembly and the dry powder inhalation inhaler, the first protruding part protruding out of the inner wall of the air channel can collide with medicine powder passing through the air channel, the breaking degree of the medicine powder before the medicine powder is inhaled by a patient is improved, the particle size of the medicine powder inhaled by the patient is small enough, and the medicine taking effectiveness of the patient can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly to a mouthpiece assembly of a powder inhaler and a powder inhaler. Background Art

[0002] A dry powder inhaler (DPI) is a device that atomizes and disperses dry drug powder through the active inhalation of a patient, and then delivers the drug to the lungs. The drug powder is generally mixed with a carrier and stored in a capsule, a reservoir or a blister through precise dosage weighing, and the accuracy and stability of the dosage can be ensured during inhalation.

[0003] In the prior art, there is a type of dry powder inhaler, which structurally includes a capsule chamber for accommodating a capsule, a needle for puncturing the capsule, and a mouthpiece communicating with the capsule chamber. During use, the user needs to puncture the capsule in the capsule chamber with the needle, and then inhale through the mouthpiece to make the capsule rotate in the capsule chamber. During the rotation of the capsule, the drug powder is released from the punctured part. The drug powder particles collide with the inner wall of the airway of the mouthpiece during the airflow and break up, generating smaller particle sizes that are inhaled by the user into the respiratory tract. The following problems exist in this process:

[0004] 1. The drug powder particles do not collide sufficiently in the airway of the mouthpiece, and the particle size of the broken-up particles is not ideal;

[0005] 2. The frictional force between the inner wall of the capsule chamber and the outer wall of the capsule is relatively large, which affects the rotation speed of the capsule. The small rotation speed of the capsule is not conducive to the centrifugation of the drug powder particles, and the release effect of the drug powder is not ideal. Summary of the Utility Model

[0006] In view of this, the embodiments of the present application provide a mouthpiece assembly of a powder inhaler and a powder inhaler to solve at least one problem in the background art.

[0007] In a first aspect, the embodiments of the present application provide a mouthpiece assembly of a powder inhaler, including:

[0008] An airway, one end of the airway is connected to the capsule chamber of the powder inhaler, and the other end of the airway is the outlet of the mouthpiece of the powder inhaler; the airway is used for the drug powder and airflow in the capsule chamber to pass through and discharge from the outlet;

[0009] A plurality of first protrusions, which are protrudingly arranged on the inner wall of the airway; the first protrusions can collide with the drug powder.

[0010] In combination with the first aspect of the present application, in an optional implementation manner, the mouthpiece assembly includes a screen holder; one end of the screen holder is connected to the capsule chamber, and the inner wall of the screen holder forms part of the airway;

[0011] The first convex portion is at least distributed on the inner wall of the screen holder.

[0012] Combined with the first aspect of the present application, in an alternative embodiment, the inner wall of the screen holder includes a conical surface, and the conical surface forms part of the air passage. The diameter of the conical surface gradually decreases along the fluid flow direction in the air passage; the first convex portion is provided on the conical surface.

[0013] Combined with the first aspect of the present application, in an alternative embodiment, the first convex portion includes a protruding body and a spherical head, and the spherical head is located on the side of the protruding body facing the capsule chamber.

[0014] Combined with the first aspect of the present application, in an alternative embodiment, the nozzle assembly includes the nozzle, and the inner wall of the nozzle forms part of the air passage. The first convex portion is at least distributed on the inner wall of the nozzle.

[0015] Combined with the first aspect of the present application, in an alternative embodiment, the first convex portion includes a plurality of first ribs and / or a plurality of first bumps, and the plurality of first ribs and / or the plurality of first bumps are arranged in an array around the central axis of the air passage.

[0016] Combined with the first aspect of the present application, in an alternative embodiment, the extending direction of the plurality of first ribs is parallel to the central axis of the air passage, or the plurality of first ribs surround the central axis of the air passage and extend in a spiral shape.

[0017] Combined with the first aspect of the present application, in an alternative embodiment, the inner wall of the nozzle includes a spiral structure, and the spiral structure surrounds the central axis of the air passage and extends along the axial direction of the air passage.

[0018] Combined with the first aspect of the present application, in an alternative embodiment, the spiral structure includes: a spiral channel formed by the first convex portion, or a spiral channel formed by a groove on the inner wall of the nozzle.

[0019] In a second aspect, an embodiment of the present application provides a powder inhaler, including the nozzle assembly described in the first aspect.

[0020] Combined with the second aspect of the present application, in an alternative embodiment, the powder inhaler includes a capsule chamber and a second convex portion protruding from the inner wall of the capsule chamber, and the second convex portion can reduce the contact area between the capsule and the inner wall of the capsule chamber.

[0021] Combined with the second aspect of the present application, in an alternative embodiment, the second convex portion includes a plurality of second ribs and / or a plurality of second bumps, and the plurality of second ribs and / or the plurality of second bumps are arranged in an array around the central axis of the capsule chamber.

[0022] In combination with the second aspect of the present application, in an alternative embodiment, the extending direction of the second rib is parallel to the central axis of the capsule chamber.

[0023] In the nozzle assembly and the powder inhaler provided by the embodiments of the present application, the first convex portion protruding from the inner wall of the airway can collide with the medicinal powder passing through the airway, improving the degree of fragmentation of the medicinal powder before being inhaled by the patient, making the particle size of the medicinal powder inhaled by the patient small enough, which is beneficial to improving the effectiveness of the patient taking the medicine.

[0024] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0026] Figure 1 is a schematic structural diagram of the powder inhaler provided in Embodiment 1 of the present application;

[0027] Figure 2 is a cross-sectional view of the structure of the powder inhaler provided in Embodiment 1 of the present application;

[0028] Figure 3 is Figure 2 an enlarged view of part A in

[0029] Figure 4 In

[0030] Figure 5 in, (a) is a three-dimensional view of the structure of the screen holder provided in Embodiment 1 of the present application, and (b) is a bottom view of the structure of the screen holder provided in Embodiment 1 of the present application;

[0031] Figure 6 in, (a) is a front view of the structure of the capsule chamber provided in Embodiment 2 of the present application, (b) is a cross-sectional view of the structure of the capsule chamber provided in Embodiment 2 of the present application, and (c) is a top view of the structure of the capsule chamber provided in Embodiment 2 of the present application;

[0032] Figure 7 is a cross-sectional view of the nozzle structure of the powder inhaler provided in Embodiment 3 of the present application;

[0033] Figure 8 is a cross-sectional view of the nozzle structure of the powder inhaler provided in Embodiment 4 of the present application.

[0034] The reference numerals in the figures are as follows:

[0035] 1. Airway;

[0036] 11. Conical surface; 12. Cylindrical surface;

[0037] 2. First convex part;

[0038] 21. Protruding body; 22. Ball head; 23. Spiral structure; 24. First rib; 25. First convex point;

[0039] 3. Capsule chamber;

[0040] 4. Second convex part;

[0041] 41. Second rib; 42. Second convex point;

[0042] 100. Base; 101. Window; 200. Rotating shaft; 300. Dust cover; 400. Suction nozzle; 401. Screen base; 600. Needle button; 601. Needle; 602. Spring; 700. Screen. Detailed implementation manners

[0043] In order to make the technical solutions and beneficial effects of the present utility model more obvious and understandable, the following will be described in detail by listing specific embodiments. Among them, the drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical and scientific fields to which this application belongs.

[0044] In the description of the present utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of simplifying the description of the present utility model, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to the present utility model.

[0045] In the present utility model, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may clearly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc., unless otherwise specifically defined.

[0046] In the present utility model, unless otherwise clearly defined, the terms "mounted", "connected", "connected to", "fixed", "arranged", etc. shall be understood in a broad sense. For example, "connected" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may also be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly defined, the first feature being "on", "above", "over", "upon", "under", "beneath", "below", or "underneath" the second feature may be that the first feature is in direct contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", or "upon" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature being "under", "beneath", or "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0048] To thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other implementation manners.

[0049] This embodiment provides a mouthpiece assembly of a powder inhaler, including: an airway 1 and several first protrusions 2. One end of the airway 1 is connected to the capsule chamber 3 of the powder inhaler, and the other end of the airway 1 is the outlet of the mouthpiece 400 of the powder inhaler; the airway 1 is used for the powder and air flow in the capsule chamber 3 to pass through and discharge from the outlet; several first protrusions 2 protrude from the inner wall of the airway 1, and the first protrusions 2 can collide with the powder.

[0050] The structure and working principle of the powder inhaler are as Figure 1 、Figure 2 As shown in the figure, it includes a base 100, a rotating shaft 200, a dust cover 300 and a nozzle 400. The nozzle 400 is rotatably connected to the base 100 through the rotating shaft 200, and the dust cover 300 covers the nozzle 400 to play a sealing and protecting role. As Figure 2 shown, a capsule chamber 3 is installed in the base 100 for accommodating capsules filled with medicinal powder. The nozzle 400 can be docked with or separated from the base 100 by rotating around the rotating shaft 200. When the nozzle 400 is docked with the base 100, the air passage 1 of the nozzle 400 communicates with the capsule chamber 3, so that when the user inhales from the nozzle 400, the medicinal powder released by the capsule can be sucked out; when the nozzle 400 is separated from the base 100, the upper end of the capsule chamber 3 is open, facilitating the placement of the capsules to be used therein. As Figure 2 shown, the powder inhaler further includes a needle button 600, a needle 601 and a spring 602 installed in the base 100. The needle button 600 is used to drive the needle 601 to move to pierce the capsule in the capsule chamber 3, and the spring 602 is used to reset the needle button 600. As Figure 1 shown, a viewing window 101 is provided on one side of the base 100. The viewing window 101 is transparent and is aligned with the capsule chamber 3 for the user to view the capsule chamber 3.

[0051] When a patient uses the powder inhaler, it is necessary to open the dust cover 300 and rotate the nozzle 400 to open the upper end of the capsule chamber 3. Then put the capsules to be taken into the capsule chamber 3 and rotate the nozzle 400 to close the capsule chamber 3. Then press the needle button 600 to pierce the capsule, and then pick up the powder inhaler and inhale from the nozzle 400. At this time, the capsules in the capsule chamber 3 will vibrate and start to rotate. Since the capsules are pierced, the medicinal powder particles inside them will separate from the inside of the capsules under the action of vibration and centrifugation and enter the patient's respiratory tract along with the airflow of the patient's breath.

[0052] By providing the nozzle assembly of this embodiment in the powder inhaler, when the user inhales from the nozzle 400, the medicinal powder passes through the air passage 1 along with the airflow. During this period, the medicinal powder collides with a number of first convex portions 2, generating medicinal powder particles with smaller particle sizes to be inhaled by the patient into the lungs.

[0053] Microscopically, the principle of medicinal powder release: Microscopically, the medicinal powder particles include active ingredient particles and lactose. Lactose is a honeycomb structure, and the active ingredient particles are attached to the honeycomb structure of lactose. The particle size of a single active ingredient particle is about 5 microns. During the process of medicinal powder release, it is necessary to separate the active ingredient particles and lactose by impact. The impact forms include: (1) direct impact between medicinal powder particles; (2) impact between medicinal powder particles and the inner wall of the air passage 1; (3) impact between medicinal powder particles and a number of first convex portions 2 of the air passage 1. In this embodiment, compared with the existing powder inhalers, the impact between the medicinal powder particles and a number of first convex portions 2 of the air passage 1 is increased, significantly improving the effect of medicinal powder release.

[0054] In the embodiment provided by the present application, the nozzle assembly and the powder inhaler, the first protrusion 2 protruding from the inner wall of the airway can collide with the medicament powder passing through in the airway 1, improving the degree of fragmentation of the medicament powder before being inhaled by the patient, making the particle size of the medicament powder inhaled by the patient small enough, which is beneficial to improving the effectiveness of the patient's medication.

[0055] In an alternative embodiment, as Figure 2 、 Figure 3 shown, the nozzle assembly includes a screen holder 401; one end of the screen holder 401 is connected to the capsule chamber 3, and the inner wall of the screen holder 401 forms part of the airway 1; the first protrusion 2 is distributed on the inner wall of the screen holder 401. In this embodiment, the nozzle assembly is a split structure, including a nozzle 400 and a screen holder 401. The inner wall of the screen holder 401 is connected to the inner wall of the nozzle 400, and the part of the airway 1 formed by the inner wall of the screen holder 401 and the part of the airway 1 formed by the inner wall of the nozzle 400 are combined to obtain the entire airway 1. Among them, the first protrusion 2 can be provided only on the inner wall of the screen holder 401, or only on the inner wall of the nozzle 400, or the first protrusion 2 can be provided on both the inner wall of the screen holder 401 and the inner wall of the nozzle 400.

[0056] In an alternative embodiment, as Figure 2 、 Figure 3 shown, the upper end of the screen holder 401 has a slot for inserting the nozzle 400, and the two are connected by plugging. The lower end of the screen holder 401 is used for installing the screen 700. This structure can facilitate the fixation of the nozzle 400 and the screen 700 at both ends of the screen holder 401 respectively.

[0057] In an alternative embodiment, as Figure 2 、 Figure 3 shown, the inner wall of the screen holder 401 includes a conical surface 11, the conical surface 11 forms part of the airway 1, and the diameter of the conical surface 11 gradually decreases along the flow direction of the fluid in the airway 1; the first protrusion 2 is provided on the conical surface 11. In this embodiment, the conical surface 11 has a guiding effect on the air flow, which can reduce the retention of the medicament powder at the inner wall of the airway 1. The conical surface 11 is also the position where the air flow direction in the airway 1 deflects. Therefore, the medicament powder is more likely to collide at the conical surface 11. Therefore, the first protrusion 2 on the conical surface 11 is also more likely to collide with the medicament powder, improving the collision effect on the medicament powder. It can be understood that in other embodiments, the inner wall of the screen holder 401 can also be a cylindrical surface or an irregular curved surface.

[0058] In an alternative embodiment, as Figure 4As shown, the first protrusion 2 includes a protruding body 21 and a spherical head 22, and the spherical head 22 is located on the side of the protruding body 21 facing the capsule chamber 3. In this embodiment, one side of the first protrusion 2 is the spherical head 22, and the function of the spherical head 22 is to face the blowing fluid. Since the spherical head 22 has a smooth shape, it is not easy to cause fluid retention when facing the fluid. Therefore, when the powder in the capsule chamber 3 is inhaled into the airway 1, the first protrusion 2 collides with the powder. Under the action of the spherical head 22, the powder can collide with it and is not easily retained on the surface of the spherical head 22. The function of the protruding body 21 is to facilitate the setting of the spherical head 22. The structure of a single spherical head 22 is difficult to be formed on the wall surface. Therefore, the spherical head 22 is connected to the inner wall of the airway 1 through the protruding body 21. In this embodiment, the structures of the spherical head 22 and the protruding body 21 are distributed at the conical surface 11. It can be understood that in other embodiments, the structures of the spherical head 22 and the protruding body 21 can also be distributed on the inner wall of the mouthpiece 400.

[0059] In an alternative embodiment, as Figure 3 shown, the inner wall of the mouthpiece 400 is a cylindrical surface 12, and the first protrusion 2 includes a plurality of first convex points 25, and the plurality of first convex points 25 are arranged on the cylindrical surface 12 in an array around the central axis of the cylindrical surface 12. In this embodiment, the plurality of first convex points 25 can collide with the powder, promoting the fragmentation of the powder inside the mouthpiece 400. It can be understood that in other embodiments, the first convex points 25 can also be arranged on the conical surface 11 in an array around the central axis of the conical surface 11.

[0060] This embodiment provides a powder inhaler, including the mouthpiece assembly described in this embodiment. In the powder inhaler of this embodiment, when the user inhales through the mouthpiece 400, the powder passes through the airway 1 along with the airflow. During this period, the powder collides with a plurality of first protrusions 2, generating smaller particle size powder particles to be inhaled into the lungs by the patient.

[0061] In an alternative embodiment, as Figure 2 shown, the powder inhaler of this embodiment includes a capsule chamber 3 and a second protrusion 4 protruding from the inner wall of the capsule chamber 3. The second protrusion 4 can reduce the contact area between the capsule and the inner wall of the capsule chamber 3. In this embodiment, through the second protrusion 4, a certain isolation is performed between the capsule in the capsule chamber 3 and the inner wall of the capsule chamber 3, avoiding too large a contact area between the outer wall of the capsule and the inner wall of the capsule chamber 3, and preventing the capsule from being affected by excessive friction when rotating, which may affect the rotation speed. Through the setting of the second protrusion 4, when the capsule rotates driven by the airflow, the powder release effect is better.

[0062] In an alternative embodiment, as Figure 5As shown, the second protrusion 4 includes a plurality of second bumps 42, and the plurality of second bumps 42 are arranged in an array around the central axis of the capsule chamber 3. The existence of the plurality of second bumps 42 makes it difficult for the outer wall of the capsule to fit against the inner wall of the capsule chamber 3, and can effectively prevent the contact area between the outer wall of the capsule and the inner wall of the capsule chamber 3 from being too large.

[0063] Embodiment 2

[0064] The suction nozzle assembly provided in this embodiment has the following differences from the suction nozzle assembly provided in Embodiment 1:

[0065] As Figure 6 shown, the second protrusion 4 includes a plurality of second ribs 41, and the plurality of second ribs 41 are arranged in an array around the central axis of the capsule chamber 3. The existence of the plurality of second ribs 41 makes it difficult for the outer wall of the capsule to fit against the inner wall of the capsule chamber 3, and can effectively prevent the contact area between the outer wall of the capsule and the inner wall of the capsule chamber 3 from being too large.

[0066] It can be understood that the second ribs 41 in this embodiment can coexist with the second bumps 42 in Embodiment 1, that is, the second protrusion 4 can include both the second ribs 41 and the second bumps 42 at the same time, which can also play a role in preventing the contact area between the outer wall of the capsule and the inner wall of the capsule chamber 3 from being too large.

[0067] In an alternative embodiment, as Figure 6 shown, the extending direction of the second ribs 41 is parallel to the central axis of the capsule chamber 3. In this arrangement, the extending direction of the second ribs 41 is the same as the extending direction of the air passage 1, so that at each height along the extending direction of the air passage 1, the second ribs 41 can prevent the outer wall of the capsule from fitting against the inner wall of the capsule chamber 3.

[0068] Embodiment 3

[0069] The suction nozzle assembly provided in this embodiment has the following differences from the suction nozzle assembly provided in Embodiment 1:

[0070] As Figure 7 shown, its first protrusion 2 includes a plurality of first ribs 24, and the plurality of first ribs 24 are arranged in an array around the central axis of the air passage 1. In this embodiment, the first protrusion 2 is designed to be strip-shaped and has a relatively long covering length. The plurality of first ribs 24 can collide with the powder, promoting the fragmentation of the powder inside the suction nozzle 400. It can be understood that in other embodiments, the first ribs 24 can also be arranged in an array around the central axis of the conical surface 11 on the conical surface 11.

[0071] In an alternative embodiment, as Figure 7As shown, the extending directions of a plurality of first rib strips 24 are parallel to the central axis of the air passage 1. In this arrangement, the extending direction of the first rib strip 24 is the same as the extending direction of the air passage 1, so that at each height along the extending direction of the air passage 1, the first rib strip 24 can be collided with by the powder.

[0072] Embodiment 4

[0073] This embodiment provides a nozzle assembly, and the differences from the nozzle assembly provided in Embodiment 3 are as follows:

[0074] As Figure 8 shown, the inner wall of the nozzle 400 includes a spiral structure 23, and the spiral structure 23 surrounds the central axis of the air passage 1 and extends along the axial direction of the air passage 1. In this embodiment, the spiral structure 23 can make the air flow spiral upward, increasing the frequency of direct collision between the powders.

[0075] In an optional embodiment, the spiral structure 23 includes: a spiral channel formed by the first protrusion 2, or a spiral channel formed by a groove on the inner wall of the nozzle 400. In this embodiment, the spiral structure 23 can be formed by the first protrusion 2 on the inner wall of the nozzle 400, or can also be formed by a groove on the inner wall of the nozzle 400. When the spiral structure 23 is formed by the first protrusion 2, it can not only make the air flow spiral upward, increasing the collision frequency between the powders, but also has the function of the first protrusion 2 described in Embodiment 1, which can increase the surface area of the inner wall of the air passage 1 and increase the impact frequency with the powders.

[0076] It can be understood that when the spiral structure 23 is formed by the first protrusion 2, it is equivalent to that the first rib strip 24 provided in Embodiment 3 surrounds the central axis of the air passage 1 and extends in a spiral shape, forming a protruding spiral channel on the inner wall of the nozzle 400.

[0077] It should be understood that the above embodiments are all exemplary and are not used to cover all possible implementation manners included in the claims. Without departing from the scope of the present disclosure, various deformations and changes can also be made on the basis of the above embodiments. Similarly, the various technical features of the above embodiments can also be arbitrarily combined to form other embodiments of the present application that may not be clearly described. Therefore, the above embodiments only represent several implementation manners of the present application and do not limit the protection scope of the patent of the present application.

Claims

1. A nozzle assembly for a powder inhaler, characterized in that: include: An airway (1), one end of the airway (1) being connected to the capsule compartment (3) of the powder inhaler, and the other end of the airway (1) being an outlet of the mouthpiece (400) of the powder inhaler; the airway (1) is used for allowing the medicine powder and airflow in the capsule compartment (3) to pass through and be discharged from the outlet; A plurality of first protrusions (2) are protrudingly arranged on the inner wall of the airway (1); the first protrusions (2) are capable of colliding with the medicine powder.

2. The nozzle assembly according to claim 1, characterized in that: The suction nozzle assembly comprises a mesh seat (401); one end of the mesh seat (401) is connected to the capsule compartment (3), and the inner wall of the mesh seat (401) forms part of the airway (1); The first protrusion (2) is distributed at least on the inner wall of the screen seat (401).

3. The nozzle assembly according to claim 2, characterized in that: The inner wall of the screen seat (401) comprises a conical surface (11), the conical surface (11) forms part of the air passage (1), and the diameter of the conical surface (11) gradually decreases along the flow direction of the fluid in the air passage (1); the first protrusion (2) is provided on the conical surface (11).

4. The nozzle assembly according to claim 3, characterized in that: The first protrusion (2) comprises a protrusion (21) and a ball head (22), wherein the ball head (22) is located on a side of the protrusion (21) facing the capsule compartment (3).

5. The nozzle assembly according to any one of claims 1 to 4, characterized in that: The suction nozzle assembly comprises the suction nozzle (400), the inner wall of the suction nozzle (400) forming part of the air passage (1), and the first protrusion (2) being distributed at least on the inner wall of the suction nozzle (400).

6. The nozzle assembly according to claim 5, characterized in that: The first raised portion (2) comprises a plurality of first ribs (24) and / or a plurality of first protrusions (25), and the plurality of first ribs (24) and / or the plurality of first protrusions (25) are arranged in an array around the central axis of the airway (1).

7. The nozzle assembly according to claim 6, characterized in that: The extension direction of the plurality of first ribs (24) is parallel to the central axis of the airway (1), or the plurality of first ribs (24) surround the central axis of the airway (1) and extend in a spiral shape.

8. The nozzle assembly according to claim 5, characterized in that: The inner wall of the suction nozzle (400) comprises a spiral structure (23), and the spiral structure (23) surrounds the central axis of the airway (1) and extends along the axial direction of the airway (1).

9. The nozzle assembly according to claim 8, characterized in that: The spiral structure (23) comprises: a spiral channel formed by the first protrusion (2), or a spiral channel formed by a groove located on the inner wall of the suction nozzle (400).

10. A powder inhaler, characterized in that: The invention comprises a nozzle assembly as described in any one of claims 1 to 9.

11. The powder inhaler according to claim 10, characterized in that: The powder inhaler comprises a capsule compartment (3) and a second protrusion (4) protruding from the inner wall of the capsule compartment (3), wherein the second protrusion (4) can reduce the contact area between the capsule and the inner wall of the capsule compartment (3).

12. The powder inhaler according to claim 11, characterized in that The second raised portion (4) comprises a plurality of second ribs (41) and / or a plurality of second protrusions (42), and the plurality of second ribs (41) and / or the plurality of second protrusions (42) are arranged in an array around the central axis of the capsule compartment (3).

13. The powder inhaler according to claim 12, characterized in that: The extension direction of the second rib (41) is parallel to the central axis of the capsule compartment (3).

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