CN209884953U

CN209884953U - Improved capsule type dry powder inhaler

Info

Publication number: CN209884953U
Application number: CN201821798483.4U
Authority: CN
Inventors: 周莉萍; 张伟; 朱雪冰; 李昌辉
Original assignee: Chia Tai Tianqing Pharmaceutical Group Co Ltd
Current assignee: Chia Tai Tianqing Pharmaceutical Group Co Ltd
Priority date: 2018-11-02
Filing date: 2018-11-02
Publication date: 2020-01-03
Anticipated expiration: 2028-11-02

Abstract

The utility model relates to a modified capsule type dry powder inhaler belongs to the medical instrument field. Complex operation and the technical problem who has the pollution risk when using to the product of selling, the utility model discloses improve the dry powder inhaler, set up a stop gear in the suction nozzle hinge seat department of suction nozzle, set up a baffle on the plate hinge seat of plate, after certain angle was opened to the suction nozzle, stop gear supported the baffle, and the angle of opening after the restriction suction nozzle was opened does not influence the angle of opening of shroud, realizes the autosegregation of suction nozzle and shroud. The risk of contamination caused by the nozzle being pulled out of the cover is avoided while the operation is simplified. In order to further simplify the operation, the utility model discloses still set up a arch on the suction nozzle, in the shroud opening process, the closure element on the shroud contacts with the arch, and the suction nozzle can be opened to the biggest frictional force that produces, realizes the one step of opening of shroud and suction nozzle.

Description

Improved capsule type dry powder inhaler

Technical Field

The utility model belongs to the field of medical equipment, a capsule type dry powder inhaler is related to.

Background

At present, pulmonary inhalation administration is the best treatment mode for treating pulmonary diseases such as asthma, chronic obstructive pneumonia and the like, and the market is huge because the pulmonary inhalation administration is further expanded to treat systemic diseases such as diabetes and the like in recent years. And the traditional administration modes are as follows: compared with injection, oral administration, external application and the like, the pulmonary inhalation administration has unique advantages, mainly comprising: (1) the surface area of the lung is large, and the adult pulmonary alveolus surface area can reach 140 square meters; (2) the alveolar wall is very thin, and a large number of capillary vessels are densely distributed around the alveolar wall; (3) the activity of biological metabolic enzyme in the lung is low; (4) the tolerance of the patient to the medicine is good; (5) no first pass effect of liver, small dosage, quick action, and low adverse side effect; (6) is suitable for biological macromolecule transfer and the like. In contrast, pulmonary delivery requires the dispersion, aerosolization, and pulmonary delivery of the drug to be accomplished with a specific delivery device that plays a critical role in the pulmonary delivery system.

To date, there are three main types of pulmonary inhalation delivery devices: nebulizers (Nebulizer, NEB), Pressurized Metered Dose inhalers (pMDI), Dry Powder inhalers (Dry Powder Inhaler, DPI). The NEB atomizes the medicine into tiny particles by means of jet flow, ultrasound and the like, and the medicine enters the respiratory tract and the lung to be deposited by means of breathing and inhaling of a patient, so that the aim of painless and rapid treatment is fulfilled. However, the NEB has a large volume, is mostly suitable for hospital treatment, and is not suitable for carrying about. The pMDI is suitable for the treatment of various bronchial asthma, and has the advantages of small volume, portability, repeated dosing, no need of regular disinfection and the like, but the pMDI has high requirements on the operating technology of patients, and needs the proper matching of medicine ejection and patient inhalation, and the operation process of young children and old people is difficult to master, so that the defects of low medicine pulmonary delivery efficiency, poor treatment effect and the like are caused. Moreover, the conventional pMDI takes Freon as a propellant, so that the atmospheric layer is easily damaged to cause pollution. Although the improved application of hydrofluoroalkane as propellant is environmentally friendly and has no damage to the atmospheric ozone layer, it still brings about greenhouse effect. DPI is a propellant-free micronized aerosol inhaler, which is a formulation in which the micronized drug or carrier is stored in capsules, vesicles, or multi-dose reservoirs, and actively inhaled by the patient using a specially designed dry powder inhalation device. Because the device does not need a propellant, the dispersion of the drug is initiated by the inspiratory airflow of a patient, the device has no synergistic effect, and the biomacromolecule drug has the characteristics of higher stability, convenience, no pollution and the like in a dry powder state and is gradually becoming the mainstream of a pulmonary inhalation drug delivery device.

Existing DPIs can be divided into three major categories: the first type: powder medicament inhaler of the reservoir type, which has a reservoir for a dose of powder, and a dosing member for separating the dose of powder from the reservoir on each actuation, the separated powder being then inhaled into the patient via a discharge conduit. The second type: a multi-dose powder medicine inhaler, wherein powder is independently stored in advance in blisters on a blister strip, the blisters are evenly distributed on the blister strip, and the blister strip is installed on a rotating disk in the powder medicine inhaler; each actuation of the powder medicine inhaler causes a blister to be opened and the powder to be inhaled into the patient through the discharge tube. In the third category: a single-dose type powder medicine inhaler, wherein powder is separately stored in a single capsule in advance, the capsule is distributed on a capsule plate, a patient firstly takes out the capsule from the capsule plate when using the powder medicine inhaler, then the taken-out capsule is put into a capsule cavity of the powder medicine inhaler, the capsule is punctured by pressing a button, and the powder is inhaled into the body of the patient through a discharge pipe.

In the existing DPI, the problem of the single dose capsule type dry powder inhaler being too complicated to operate compared to other inhalers, such as the commercial products

After we have decomposed the whole dry powder inhalation process in detail, a total of 10 steps are required to complete the drug inhalation. The method comprises the following steps: 1) taking out the suction device; 2) pressing the operating mechanism to separate the cover from the lower shell; 3) opening the cover; 4) opening the suction nozzle; 5) putting the capsule into the capsule cavity; 6) pulling out the suction nozzle from the cover cap and clamping the suction nozzle on the plate; 7) pressing the operating mechanism to make the pricking pin puncture the capsule; 8) inhaling the medicinal powder; 9) removing the empty capsule; 10) cleaning and closing the cover.

In the study of commercially available products

After the operation, it is found that in the sixth step, the suction nozzle needs to be pulled out from the cover cap, the separation of the suction nozzle and the cover cap is realized, and then the suction nozzle is locked on the plate. The manual separation mode is not only complicated in operation and inconvenient for the use of a patient, but also has the possibility of inadvertently polluting the screen mesh in the pulling-out process.

Chinese patent document CN1874817A discloses a one-step opening method by designing a multifunctional operating mechanism and an elastic element, but this design also brings more complicated problems while improving the operation, firstly, the design of the multifunctional operating mechanism is more complicated, and the difficulty in production is increased; secondly, associating the mouthpiece with the operating mechanism so that, including for the purpose of piercing the capsule, the mouthpiece is opened by simply pressing the operating mechanism, so that with the inhaler, the capsule needs to be pierced with the mouthpiece open, which undoubtedly increases the risk of contamination of the medicament; finally, because the force for releasing the cover cap and the suction nozzle is small, the elastic element is introduced, so that when the suction nozzle is clamped on the plate, the elastic element is always in a compressed state, on one hand, the air tightness between the suction nozzle and the plate is influenced, and on the other hand, the suction nozzle can be bounced off by the elastic element at any time as long as the clamping buckle is abraded. It is also disclosed in this patent that the opening of the suction nozzle by designing the squeezable operating window or designing the multi-function operating mechanism in two pieces, the above problems cannot be avoided as well, and the simultaneous opening of the cover and the suction nozzle cannot be really achieved.

SUMMERY OF THE UTILITY MODEL

The technical problem solved by the utility model is that, improve current single dose capsule type dry powder inhaler, realize the autosegregation of shroud and suction nozzle for it is more convenient and safe in the operation.

The utility model provides a single dose capsule type dry powder inhaler, its structure includes: a cover cap, a suction nozzle, a plate with a capsule cavity fixed below, an operating mechanism with a puncture needle and a lower shell; the cover cap, the suction nozzle, the plate and the lower shell are connected through a unique shaft, the top of the capsule cavity is opened on the plate, and the cover capA closing element is arranged on the upper shell, and the suction nozzle in a closed position is locked and covered by the closing element, the suction nozzle in the closed position is locked on the plate and covers the top of the capsule cavity on the plate, and the plate is locked on the lower shell; wherein the suction nozzle is provided with a limiting mechanism at the shaft connection part for limiting the opening range of the suction nozzle around the shaft so as to ensure that the maximum opening angle beta of the suction nozzle₂Less than the maximum opening angle beta of the cover₁。

Preferably, the cover cap, the suction nozzle, the panel and the lower case are connected with the hinge pin through the cover cap hinge seat, the suction nozzle hinge seat, the panel hinge seat and the lower case hinge seat, respectively.

Preferably, the mouthpiece in the closed position is latched by means of a first lug on a first recess of the plate element, and the plate element is latched by means of a second lug on a second recess of the lower shell.

Preferably, a limiting mechanism is arranged at the joint of the suction nozzle hinge seat and the hinge pin of the suction nozzle, so that the maximum opening angle beta of the suction nozzle is enabled to be larger₂Less than the maximum opening angle beta of the cover₁. By means of the difference in the opening angle, the cover and the suction nozzle are separated during the opening process.

Preferably, the limiting mechanism protrudes from the surface of the suction nozzle hinge seat when the suction nozzle is positioned at the maximum opening angle beta₂When the suction nozzle is opened, the limiting mechanism props against the outer surface of the lower shell and limits the suction nozzle to be further opened.

In a preferred embodiment of the present invention, the suction nozzle hinge seat is a double-lug ring, the plate hinge seat is a single-lug ring, the plate hinge seat is installed at an intermediate position of the hinge pin, the suction nozzle hinge seat is installed at two adjacent sides of the plate hinge seat, wherein the plate hinge seat is provided with a baffle, the limiting mechanism is installed on the suction nozzle hinge seat in a form of a bridging seat, and when the suction nozzle is located at a maximum opening angle β₂When the suction nozzle is opened, the limiting mechanism is abutted against the baffle and limits the suction nozzle to be further opened.

Preferably, the cover hinge seat and the lower shell hinge seat are both of a double-lug ring type, the cover hinge seat is mounted on two adjacent sides of the suction nozzle hinge seat, and the lower shell hinge seat is mounted on two adjacent sides of the cover hinge seat.

Preferably, the outer diameters of the cover hood hinge seat, the suction nozzle hinge seat and the lower shell hinge seat are the same, and the limiting mechanism and the baffle plate do not protrude out of the surfaces of the cover hood hinge seat, the suction nozzle hinge seat and the lower shell hinge seat.

In order to further simplify the operation and realize the synchronous opening of the cover cap and the suction nozzle, in a preferred aspect of the present invention, the opening track of the cover cap after the cover cap is released from the latch coincides with the contour of the suction nozzle in the closed position, so that the cover cap contacts with the suction nozzle in the opening process to carry the suction nozzle to open synchronously.

Preferably, a closing element is arranged at one end of the cover far away from the hinge pin, a protrusion is arranged at one side of the upper end of the suction nozzle far away from the hinge pin, the cover locks one end of the plate far away from the hinge pin through the closing element, and after the cover is unlocked, the opening track of the closing element is overlapped with the protrusion on the suction nozzle in the closed position.

Preferably wherein the maximum opening angle β of the cover₁Maximum opening angle beta with the suction nozzle₂The difference beta is larger than the included angle alpha between the cover cap and the suction nozzle when the motion trail of the closing element is contacted with the suction nozzle in the closed position. So that the suction nozzle and the cover cap can be automatically separated in a flicking way.

Compared with the prior art, the utility model has the advantages that:

at first, pull out the suction nozzle from the shroud in operating to current single dose capsule type dry powder inhaler to the kayser is on the plate, and the operation that brings is complicated and there is the possible technical problem of pollution, the utility model discloses on the basis of the operation that does not influence to adding the capsule in the capsule cavity, the suction nozzle realizes autosegregation with mode and shroud of popping one's head off, has removed the operation of pulling out the suction nozzle from the shroud in the commercial product needs from. Not only simplifies the operation, but also avoids the risk of polluting the screen.

Secondly, the substep of opening of shroud and suction nozzle goes on when using to current single dose capsule type dry powder inhaler, complex operation's technical problem, the utility model discloses realize that one step of shroud and suction nozzle is opened, simplified the operation. And the adopted technical scheme is simple, and similar problems in the prior art can not be brought.

Drawings

For a better understanding of the invention, it is explained in detail below with the aid of the drawing. In the drawings:

FIG. 1 is a perspective view showing a capsule type dry powder inhaler according to the present invention;

FIG. 2 is an exploded view of a capsule type dry powder inhaler of the present invention, illustrating the structure of each part of the present invention and the location where each part interacts with each other;

FIG. 3 is an exploded view of another capsule-type dry powder inhaler of the present invention, illustrating the structure of the various parts of the present invention and the location of the interaction of the parts;

FIG. 4 is a schematic diagram of the mouthpiece component of a capsule type dry powder inhaler of the present invention, including a top view (top) and a front view (bottom);

FIG. 5a is a perspective view showing a closed state of a capsule type dry powder inhaler according to the present invention before use;

FIG. 5b is a perspective view showing a contact state of a cap of a capsule type dry powder inhaler with a suction nozzle according to the present invention;

fig. 5c is a perspective view showing an opened state of a cap and a mouthpiece of a capsule type dry powder inhaler according to the present invention.

Detailed Description

The following detailed description is provided with reference to specific embodiments, but the embodiments of the present invention are not limited to these embodiments.

As shown in fig. 1-2, a capsule type dry powder inhaler according to an embodiment of the present invention comprises: a cover cap 1, a suction nozzle 2, a plate 3 with a capsule cavity 13 fixed below, an operating mechanism 4 with a puncture needle 10, a lower shell 5; the cover cap 1, the suction nozzle 2, the plate 3 and the lower shell 5 pass through the cover cap respectivelyThe hinge seat 9a, the suction nozzle hinge seat 9b, the plate hinge seat 9c and the lower shell hinge seat 9d are connected with the hinge pin 9, the top of the capsule cavity 13 is opened on the plate 3, the cover cap 1 is provided with the closing element 6 and locked by the closing element 6 to cover the suction nozzle 2 in the closing position, the suction nozzle 2 in the closing position is locked on the first groove 11b of the plate 3 by a first lug 11a and covers the top of the capsule cavity 13 on the plate 3, and the plate 3 is locked on the second groove 12b of the lower shell 5 by a second lug 12 a; wherein the suction nozzle 2 is provided with a limit mechanism 8 for limiting the range of the suction nozzle 2 to be opened around a shaft at the joint of the suction nozzle hinge seat 9b and the hinge pin 9, so that the maximum opening angle beta of the suction nozzle 2 is enabled₂Less than the maximum opening angle beta of the cover 1₁。

In the present embodiment, the cover 1, the suction nozzle 2, the plate 3, and the lower case 5 are connected in a single shaft form by the hinge pin 9, so that the cover 1, the suction nozzle 2, the plate 3, and the lower case 5 can be rotationally moved about the hinge pin 9. Although the mouthpiece 2 in the closed position is latched in this embodiment by means of a first lug 11a on a first recess 11b of the plate 3, the plate 3 is latched by means of a second lug 12a on a second recess 12b of the lower housing 5. In fact, how the suction nozzle 2 in the closed position is snapped onto the plate 3 and how the plate 3 is snapped onto the lower shell 5 can be achieved by other alternatives or simple modifications known to those skilled in the art, without limiting the solution of the present embodiment to solve the corresponding technical problems.

In the present embodiment, when the cover 1 is rotated about the hinge pin 9 to the maximum opening angle β₁At the same time, the suction nozzle 2 is opened by the maximum opening angle beta thereof due to the influence of the limit mechanism 8 at the hinge pin 9₂Less than the maximum opening angle beta of the cover 1₁Thus, referring to fig. 5c, the cap 1 and the mouthpiece 2 are separated after being fully opened, and the mouthpiece 2 is not fully inserted into the cap 1. In the state where the cap 1 and the suction nozzle 2 of the capsule type dry powder inhaler in the related art are completely opened, the user generally needs to pull out from the cap 1 by means of the mesh 14 of the suction nozzle 2 and latch on the plate 3 so that the suction nozzle 2 can be used for subsequent administration. In this embodiment, the user does not need to touch the screen 14, thereby avoiding the user from touching the screen 14The risk of contaminating the screen 14 is reduced.

In a preferred embodiment, as shown in fig. 2, the limit mechanism 8 protrudes from the surface of the suction nozzle hinge base 9b when the suction nozzle 2 is at the maximum opening angle β₂At this time, the stopper mechanism 8 abuts against the outer surface of the lower case 5 and restricts the suction nozzle 2 from further rotating. In order that the limiting mechanism 8 does not limit the opening angle of the cover 1 around the cover hinge seat 9a, an opening 15 is provided on the cover 1 at a corresponding position of the limiting mechanism 8 when the cover 1 is in the closed state, so that the limiting mechanism can smoothly abut against the surface of the lower shell 5 through the opening 15.

In the present embodiment, the limit mechanism 8 of the nozzle hinge base 9b is positioned at the maximum opening angle β of the nozzle 2₂While abutting against the lower shell 5 so that the suction nozzle 2 is limited with respect to the cover 1. In fact, since the cover cap 1, the suction nozzle 2, the plate 3 and the lower shell 5 are respectively connected with one hinge pin 9 through the corresponding hinge seats thereof, and the opening motion tracks of the cover cap 1 and the suction nozzle 2 are based on the plate 3 and the lower shell 5 as stationary references, the limit mechanism 8 can generate similar limit effect when the suction nozzle 2 is opened and abuts against the plate 3 or the lower shell 5, as long as the limit mechanism 8 does not influence the opening of the cover cap 1. In order to avoid that the limiting mechanism 8 protruding out of the surface of the nozzle hinge seat 9b in this embodiment would also have an influence on the cover 1, this embodiment provides an opening 15 at a corresponding position on the cover 1.

In another preferred embodiment, as shown in fig. 3, the suction nozzle hinge base 9b is of a double-lug ring type, the plate hinge base 9c is of a single-lug ring type, the plate hinge base 9c is installed at the middle position of the hinge pin 9, the suction nozzle hinge bases 9b are installed at two adjacent sides of the plate hinge base 9c, wherein the plate hinge base 9c is provided with a baffle 91c, the limiting mechanism 8 is installed on the suction nozzle hinge base 9b in a bridging manner, and when the suction nozzle 2 is located at the maximum opening angle β₂At this time, the stopper mechanism 8 abuts against the shutter 91c and restricts the nozzle 2 from being further opened. In this embodiment, the cover hinge base 9a and the lower casing hinge base 9d are both of a double-lug ring type, the cover hinge base 9a is mounted on the adjacent two sides of the suction nozzle hinge base 9b, and the lower casing hinge base 9d is mounted on the adjacent two sides of the cover hinge base 9 a. And the outer diameters of the cover hinge seat 9a, the suction nozzle hinge seat 9b and the lower shell hinge seat 9d are the sameThe stopper mechanism 8 and the baffle plate 91c do not protrude on the surfaces of the cover hinge seat 9a, the nozzle hinge seat 9b, and the lower case hinge seat 9 d.

In the present embodiment, the limit mechanism 8 of the nozzle hinge base 9b is positioned at the maximum opening angle β of the nozzle 2₂Against the plate 3 so that the suction nozzle 2 is limited with respect to the cover 1. Since the suction nozzle 2 is opened, most of the structure of the plate 3 is located at the other side of the lower case 5, and the limiting effect cannot be generated before the lower case 5 abuts against the limiting mechanism 8. Therefore, the present embodiment achieves the objective of the present invention by providing the baffle 91c on the plate hinge seat 9c and providing the limit mechanism 8 on the nozzle hinge seat 9b in the form of a bridging seat.

In another preferred embodiment, as shown in fig. 5a-5c, for the sake of simplicity of operation, a synchronized opening of the cover 1 and the suction nozzle 2 is achieved, the opening trajectory of the cover 1 after releasing the latch coincides with the contour of the suction nozzle 2 in the closed position, so that the cover 1 is in contact with the suction nozzle 2 during the opening process for carrying the suction nozzle 2 open synchronously.

In the present embodiment, the cover 1 is only in friction contact with the suction nozzle 2 in the closed position, and the maximum friction force generated during the contact is greater than the locking force between the suction nozzle 2 and the plate 3 and less than the locking force between the plate 3 and the lower shell 5, so that the suction nozzle 2 is also opened while the cover 1 is opened, and the plate 3 is not separated from the lower shell 5 due to improper operation when the cover 1 is opened. It is advantageous that the cover 1 is in only wiping contact with the suction nozzle 2 in the closed position, in order to utilize the friction forces occurring during contact to achieve the solution of the present embodiment. When the external force is gradually increased but the cover cap 1 and the suction nozzle 2 are kept relatively static, the friction force is increased along with the increase of the external force, the increase of the friction force can only reach a certain maximum value, and when the external force is larger than the maximum value, the cover cap 1 and the suction nozzle 2 can slide relatively from the relative static state. The wiping contact of the cover 1 and the suction nozzle 2 does not normally limit the range of movement of the cover 1 and the suction nozzle 2, i.e. when the user exerts an external force on the cover 1 which is greater than the maximum friction between the cover 1 and the suction nozzle 2, see fig. 5b-5c, the cover 1 and the suction nozzle 2 are brought from the relatively rest state in fig. 5b into a relative sliding movement to the state shown in fig. 5 c.

In another preferred embodiment, as shown in fig. 5a-5c, a closing element 6 is arranged at the end of the cover 1 remote from the hinge pin 9, a projection 7 is arranged at the upper end of the suction nozzle 2 remote from the hinge pin 9, the cover 1 latches the end of the plate 3 remote from the hinge pin 9 by means of the closing element 6, and after the cover 1 is unlatched, the opening trajectory of the closing element 6 coincides with the projection 7 on the suction nozzle 2 in the closed position.

The latching structure of the closing element 6 and the plate 3 on the cover cap 1 in this embodiment is a structure commonly used in the art, but in this embodiment, the movement opening track of the closing element 6 is designed to coincide with the outline of the suction nozzle 2, and the suction nozzle 2 is carried to be opened synchronously by the interaction force generated when the closing element contacts the suction nozzle 2, so that the two steps of opening the cover cap 1 and opening the suction nozzle 2 can be completed synchronously, which achieves two purposes at a time.

In another preferred embodiment, as shown in fig. 5a-5c, wherein the maximum opening angle β of the cover 1 is₁Maximum opening angle beta with the suction nozzle 2₂Is larger than the angle alpha between the cover 1 and the suction nozzle 2 when the path of movement of the closing element 6 is in contact with the suction nozzle 2 in the closed position. So that the suction nozzle 2 is automatically separated from the cap 1 in a flicking manner.

The use operation of the single-dose capsule type dry powder inhaler in the present embodiment is as follows:

firstly, the suction device is taken out, and the suction device is in a closed state, and the cover cap 1 is locked and covers the suction nozzle 2 in a closed position through the closing element 6; then, the operating mechanism 4 is pushed to unlock the closing member 6 from the panel 3, and the cover 1 and the lower shell 5 are separated; then the cover cap 1 is opened, because the motion track of the closing element 6 on the cover cap 1 is coincident with the bulge 7 on the suction nozzle 2 in the closed position, so that the closing element 6 on the cover cap 1 is contacted with the bulge 7 on the suction nozzle 2 in the opening process, the included angle between the cover cap 1 and the suction nozzle 2 is alpha, then the cover cap 1 is continuously opened, an upward friction force is generated between the closing element 6 and the bulge 7 on the suction nozzle 2, the maximum friction force is larger than the force of the suction nozzle 2 for clamping the plate 3 and smaller than the force of the plate 3 for clamping the lower shell 5, and under the action of the friction force, the first convex nose 11a of the suction nozzle 2 and the first convex nose 11a on the plate 3The buckles between the grooves 11b are loosened, and the suction nozzle 2 is opened along with the cover cap 1; continuing to open the cover 1 about the cover hinge seat 9a to a maximum opening angle beta₁And due to the existence of the limiting mechanism 8, the cover cap 1 drives the suction nozzle 2 to open around the suction nozzle hinge seat 9b, the limiting mechanism 8 is abutted against the baffle 91c on the plate hinge seat 9c, or in another embodiment, the limiting mechanism 8 is abutted against the surface of the lower shell 5, and finally, the opening angle beta of the suction nozzle 2 is enabled to be₂Less than beta₁And due to alpha<Beta, wherein beta is beta₁And beta₂In the process of continuously opening the cover cap 1, the closing element 6 on the cover cap 1 is contacted with the bulge 7 on the suction nozzle 2 again to generate an upward friction force, so that the suction nozzle 2 is bounced off from the cover cap 1, and the automatic separation of the cover cap 1 and the suction nozzle 2 is realized; then the capsule is put into the capsule cavity 13; and the suction nozzle 2 is locked on the first groove 11b of the plate 3 through the first lug 11 a; pressing the operating mechanism 4, the puncture needle 10 punctures the capsule; the patient inhales the medicine powder from the suction nozzle 2; finally removing the empty capsule; after cleaning, the cover cap 1 is closed to complete the inhalation process of the medicinal powder.

Claims

1. A capsule type dry powder inhaler comprising: a cover cap (1), a suction nozzle (2), a plate (3) with a capsule cavity (13) fixed below, an operating mechanism (4) with a puncture needle (10) and a lower shell (5); the cover cap (1), the suction nozzle (2), the plate (3) and the lower shell (5) are connected through a single shaft, the top of the capsule cavity (13) is opened on the plate (3), a closing element (6) is arranged on the cover cap (1) and is used for locking and covering the suction nozzle (2) in a closing position by the closing element (6), the suction nozzle (2) in the closing position is locked on the plate (3) and covers the top of the capsule cavity (13) on the plate (3), and the plate (3) is locked on the lower shell (5); characterized in that the suction nozzle (2) is provided with a limit mechanism (8) at the shaft connection for limiting the opening range of the suction nozzle (2) around the shaft, so that the maximum opening angle beta of the suction nozzle (2)₂Less than the maximum opening angle beta of the cover (1)₁。

2. Inhaler according to claim 1, characterized in that the cover (1), the suction nozzle (2), the plate (3) and the lower shell (5) are connected to a hinge pin (9) by means of a cover hinge seat (9a), a suction nozzle hinge seat (9b), a plate hinge seat (9c) and a lower shell hinge seat (9d), respectively.

3. Inhaler according to claim 1, characterized in that the mouthpiece (2) in the closed position is latched by means of a first lug (11a) on a first recess (11b) of the plate (3), and the plate (3) is latched by means of a second lug (12a) on a second recess (12b) of the lower shell (5).

4. Inhaler according to claim 2, characterized in that the connection of the nozzle hinge seat (9b) of the nozzle (2) and the hinge pin (9) is provided with a stop means (8), which stop means (8) can abut against the plate (3) when the nozzle (2) is opened in order to allow the maximum opening angle β of the nozzle (2)₂Less than the maximum opening angle beta of the cover (1)₁。

5. Inhaler according to claim 2, characterized in that the connection between the hinge seat (9b) of the nozzle (2) and the hinge pin (9) is provided with a stop means (8), said stop means (8) protruding from the surface of the hinge seat (9b) of the nozzle when the nozzle (2) is at the maximum opening angle β₂When the suction nozzle is opened, the limiting mechanism (8) props against the outer surface of the lower shell (5) and limits the suction nozzle (2) to be further opened.

6. The inhaler according to claim 4, wherein the suction nozzle hinge base (9b) is of a binaural loop type, the plate hinge base (9c) is of a monaural loop type, the plate hinge base (9c) is mounted at a middle position of the hinge pin (9), the suction nozzle hinge base (9b) is mounted at two adjacent sides of the plate hinge base (9c), wherein a baffle (91c) is provided on the plate hinge base (9c), the limiting mechanism (8) is provided on the suction nozzle hinge base (9b) in a bridging manner, and when the suction nozzle (2) is at the maximum opening angle β₂When the suction nozzle is opened, the limiting mechanism (8) is abutted against the baffle (91c) and limits the suction nozzle (2) to be further opened.

7. The inhaler according to claim 6, wherein the cover hinge seat (9a) and the lower casing hinge seat (9d) are of a binaural loop type, the cover hinge seat (9a) being mounted on adjacent sides of the mouthpiece hinge seat (9b), and the lower casing hinge seat (9d) being mounted on adjacent sides of the cover hinge seat (9 a).

8. The inhaler according to claim 6, wherein the outer diameters of the cover hinge seat (9a), the suction nozzle hinge seat (9b) and the lower case hinge seat (9d) are the same, and the stopper mechanism (8) and the baffle (91c) do not protrude from the surfaces of the cover hinge seat (9a), the suction nozzle hinge seat (9b) and the lower case hinge seat (9 d).

9. Inhaler according to one of claims 2 to 8, characterized in that the opening path of the cover (1) after the unlatching coincides with the contour of the suction nozzle (2) in the closed position, so that the cover (1) is in contact with the suction nozzle (2) during the opening process for carrying the suction nozzle (2) open synchronously.

10. Inhaler according to claim 9, characterized in that a closing element (6) is arranged at the end of the cover (1) remote from the hinge pin (9), a projection (7) is arranged at the upper end of the suction nozzle (2) remote from the hinge pin (9), the cover (1) latches the end of the plate (3) remote from the hinge pin (9) by means of the closing element (6), and the path of movement of the closing element (6) coincides with the projection (7) on the suction nozzle (2) in the closed position after the cover (1) is unlatched.

11. Inhaler according to claim 10, characterized in that the maximum opening angle β of the cover (1) is₁A maximum opening angle beta with the suction nozzle (2)₂The difference beta is larger than the included angle alpha between the cover cap (1) and the suction nozzle (2) when the motion trail of the closing element (6) is contacted with the suction nozzle (2) in the closed position.