CN109621110B

CN109621110B - Dose counting assembly for inhalators

Info

Publication number: CN109621110B
Application number: CN201910080608.2A
Authority: CN
Inventors: 侯士双; 袁霞林; 陈常娇
Original assignee: Ningbo Ruiai Product Design Co ltd
Current assignee: Ningbo Ruiai Product Design Co ltd
Priority date: 2019-01-28
Filing date: 2019-01-28
Publication date: 2024-06-04
Anticipated expiration: 2039-01-28
Also published as: CN109621110A

Abstract

The invention relates to a dose counting assembly for an inhaler, comprising a counting disc for displaying the residual dose in a medicine bottle and a driving piece for being linked with the medicine bottle in the inhaler, which is characterized in that: the driving piece is a driving rod which can move up and down along with the medicine bottle along the axial direction, the driving rod is connected with the counting disc through a linkage device so as to convert the linear motion of the driving rod into the rotary motion of the counting disc to count, and when the driving rod is separated from the medicine bottle, the driving rod can drive the counting disc to be separated from the linkage device, so that the counting disc is reset to an initial state. The counting disc for displaying the residual dose in the medicine bottle is triggered by the up-and-down movement of the medicine bottle to count, is convenient and accurate without additional operation, and can automatically return to zero and reset to an initial state in a state that the dose counting assembly is separated from the medicine bottle, so that the dose counting assembly can be reused.

Description

Dose counting assembly for inhalators

Technical Field

The invention belongs to the technical field of medical appliances, and particularly relates to a dose counting assembly for an inhaler.

Background

In recent years, with the development of inhaled medicines, many patients suffering from chronic airway diseases such as bronchial asthma and chronic obstructive pulmonary diseases have been on the market, and the diseases are effectively controlled by taking medicines for a long period of time, and in the prior art, the patients usually use an inhalation device to assist in inhaling medicines without supervision. Especially for asthma-like conditions, it is important for the user to have a reliable record of the level of medicament remaining in the inhaler in order to ensure that it has a sufficient supply at all times. It is therefore increasingly common for inhalers to be equipped with a dose counter to record the amount of dose expelled from or held in the inhaler.

As shown in chinese patent publication No. ZL201721350652.3 (publication No. CN 207871234U), which discloses a dose indicator of an inhaler, the inhaler includes a bottom housing and a container for storing a certain amount of medicinal mist, one end of the bottom housing is provided with a spray head, the other end is open, a spray drum with a lower end communicated with the spray head is provided on the bottom housing, an upper end of the spray drum extends toward the opening, a dosing valve is provided at a lower end of the container, a lower end of a valve rod of the dosing valve is fixed in an upper end of the spray drum, the dose indicator includes a fixed basket coaxially arranged with the spray drum and capable of moving along a spray drum axis together with the container, and a unit digital wheel disc and a ten digital wheel disc are sequentially rotatably arranged in the fixed basket along the spray drum axis, and the unit digital wheel disc and the ten digital wheel disc are rotatable relative to the ten digital wheel disc, and the unit digital wheel disc and the ten digital wheel disc are rotated in a process that the container is pressed.

Most of the prior inhalers are as shown in the above patents, the dose indicator device is triggered to work by the movement of the medicine bottle (i.e. the container), but once the medicine bottle is put into the shell, the medicine bottle can not be detached again, namely the inhaler is disposable, so that the dose indicator device of the inhaler is also discarded after being used once, and resource waste is caused; even though the drug vial is removably mounted within the housing, the dose indicator device does not have the ability to automatically return to the original state (i.e., return to zero), and thus the dose indicator device cannot be reused.

Disclosure of Invention

The invention aims to solve the technical problem of providing a dose counting assembly for an inhaler, which can be triggered and counted by a medicine bottle and can be automatically reset to an initial state.

The technical scheme adopted for solving the technical problems is as follows: a dose counter assembly for an inhaler comprising a counter plate for displaying the remaining dose in a vial and a driver for cooperating with the vial in the inhaler, the dose counter assembly comprising: the driving piece is a driving rod which can move up and down along with the medicine bottle along the axial direction, the driving rod is connected with the counting disc through a linkage device so as to convert the linear motion of the driving rod into the rotary motion of the counting disc to count, and when the driving rod is separated from the medicine bottle, the driving rod can drive the counting disc to be separated from the linkage device, so that the counting disc is reset to an initial state.

In order to enable the counting disc to be triggered to work by the medicine bottle and to return to zero for the next use, the lower end of the driving rod is used for propping against the top of the medicine bottle, and is provided with a first elastic piece, and the driving rod always keeps a downward movement trend under the action of the first elastic piece;

In the state that the body of the medicine bottle moves downwards to spray medicine, the driving rod moves downwards to a first position, and the counting disc rotates for a certain angle;

when the body of the medicine bottle moves upwards to a reset state, the driving rod moves upwards to a second position, and the counting disc keeps static or continuously rotates for a certain angle;

and in a state that the medicine bottle is separated from the driving rod, the driving rod moves downwards to a third position, the counting disc is reset to an initial state under the action of a third torsion spring, and the stroke of the driving rod moving to the third position is larger than that of the driving rod moving to the first position. So through the three distances of actuating lever removal, can realize the count of counting disk or reset, need not other extra operations, convenient and enable dose counting assembly used repeatedly.

The driving rod can transmit power to the counting disc through various structural forms, preferably, the driving rod is movably arranged on a mounting frame, the linkage device comprises a primary gear and a second final gear which are arranged on the mounting frame, the driving rod is connected with the primary gear through a driving structure, the counting disc is provided with a tooth part meshed with the second final gear, and the second final gear is directly meshed with the primary gear or is indirectly meshed with the first intermediate gear for transmission.

The first structural form of the driving structure is as follows: the driving structure comprises a driving disc, the driving rod, the driving disc and the primary gear are coaxially arranged and sequentially arranged from inside to outside, a guide strip is arranged on the inner wall of the driving disc, a second guide groove spirally arranged from top to bottom along the circumferential direction is arranged on the peripheral wall of the driving rod, and the guide strip is slidably embedded in the second guide groove; the outer peripheral wall of the driving disc is provided with an elastic pushing part, and the inner peripheral wall of the primary gear is provided with a plurality of second protruding blocks which are distributed at intervals along the circumferential direction and are blocked and matched with the pushing part. By the movement of the driving rod, the guide bar slides along the second guide groove to enable the driving disc to rotate, so that the primary gear is pushed to rotate, and finally, the primary gear transmits power to the counting disc.

Preferably, an elastic arm extending along the circumferential direction is arranged on the peripheral wall of the driving disc, the pushing part is arranged at the end part of the elastic arm, the front surface of the pushing part is a plane, the back side of the pushing part is a first guiding inclined plane, and a second guiding inclined plane matched with the first guiding inclined plane of the pushing part is also arranged on the second protruding block. The primary gear is rotated through the cooperation of the pushing part and the second lug, and the arrangement of the first guide inclined plane and the second guide inclined plane is convenient for the pushing part to be clamped with different second lugs, so that the primary gear is rotated successively.

The second structural form of the driving structure is as follows: the primary gear is sleeved on the driving rod, the driving structure comprises a driving arm and a plurality of sequentially arranged guide parts, the driving arm extends along the radial direction of the driving rod, the guide parts are circumferentially arranged on the inner peripheral wall of the primary gear, each guide part comprises a first guide block with a first inclined surface part and a second guide block with a second inclined surface part, the first inclined surface part and the second inclined surface part are circumferentially inclined from top to bottom and are opposite in inclination direction, the second inclined surface part is communicated with the first inclined surface part of the adjacent guide part, one end of the driving arm is connected with the driving rod, and the other end of the driving arm is in guiding fit with the first inclined surface part and the second inclined surface part to drive the primary gear to rotate. Along with the movement of the driving rod, the first inclined surface part and the second inclined surface part are pushed by the driving arm so as to enable the primary gear to rotate, and the primary gear finally transmits power to the counting disc.

In order to prevent the drive arm from generating interference damage parts between the drive arm and the primary gear when the drive arm pushes the primary gear, the drive arm is movably arranged on the drive rod, a second elastic piece which enables the drive arm to always have a radial outward movement trend relative to the drive rod is arranged between the drive arm and the drive rod, and the second elastic piece plays a role in buffering.

The first engagement of the final gear with the counter disk is: the tooth part is arranged on the peripheral wall of the counting disc and is positioned on one side of the driving rod in the radial direction, the driving rod is provided with a deflector rod which radially extends to the upper part of the counting disc, the counting disc moves downwards under the push of the deflector rod and is disengaged with the second final stage gear in the process of the driving rod from the first position to the third position, and the third torsion spring is a torsion spring which can be axially compressed. The structure has few parts, high working reliability and high working stability of the torsion spring.

The second engagement of the final gear with the counter disk is: the tooth part is circumferentially arranged on the inner peripheral wall of the counting disc, the upper part of the second final gear is coaxially provided with a rotating part, at least one tooth which can be meshed with the tooth part is circumferentially and alternately distributed on the outer peripheral wall of the rotating part, and the top of the counting disc is in snap fit with the top wall of the mounting frame through a clamping protrusion and a clamping groove;

The counting disc is sleeved on the driving rod, and the counting disc can be separated from the clamping convex and the clamping groove along with the downward movement of the driving rod only in the process that the driving rod is in the first position to the third position; the third torsion spring is a torsion spring capable of being compressed axially, and the counting disc always has a trend of moving upwards under the action of the third torsion spring so that the card is convexly clamped in the card slot.

In order to separate the convex and the clamping groove to reset the counting disc, the center of the counting disc is downwards recessed to form a groove, the upper end of the driving rod penetrates through the counting disc to be positioned in the groove, a fourth stop block positioned in the groove is arranged on the upper portion of the driving rod, and the counting disc is pushed by the fourth stop block to separate the clamping convex and the clamping groove in the process that the driving rod is positioned in the first position to the third position.

In order to prevent the counting disc from rotating excessively during resetting, a third stop block extending along the up-down direction is arranged on the side wall of the groove, and the third stop block is matched with the fourth stop block in a blocking manner when the counting disc is reset to an initial state.

In order to prevent the dose counting assembly from locking up as the inhaler is continued after it has been used to maximum dose, the counting disc is provided with said teeth locally.

For convenience of customers looks over the residual dose in the medicine bottle, be equipped with the count strip on the count dish, be equipped with the second window that supplies the count strip to expose at least locally on the mounting bracket, perhaps the mounting bracket corresponds the position of count strip and is transparent material at least locally, through the count on the count strip so that the user knows the number of times that the residual dose in the medicine bottle can also be used.

Compared with the prior art, the invention has the advantages that: 1. the counting disc for displaying the residual dose in the medicine bottle is triggered by the up-and-down movement of the medicine bottle to count, is convenient and accurate without additional operation, and can automatically return to zero and reset to an initial state in a state that the dose counting assembly is separated from the medicine bottle, so that the dose counting assembly can be reused; 2. the dose counting assembly only needs a driving rod, a gear train (a linkage device) and a counting disc, and has the advantages of few parts, difficult failure and high counting accuracy compared with the dose counting assembly with huge parts.

Drawings

FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an enlarged view at A of FIG. 2;

FIG. 4 is a schematic view of the dose counter assembly of FIG. 3;

FIG. 5 is a partial schematic view of the structure of FIG. 4;

FIG. 6 is a partial schematic view of the structure of FIG. 5;

FIG. 7 is a schematic view of the drive disk of FIG. 6;

FIG. 8 is a schematic view of the driving rod of FIG. 6;

FIG. 9 is a schematic view of the knob and sleeve of FIG. 2;

FIG. 10 is a schematic view of the primary gear of FIG. 3;

FIG. 11 is an exploded view of FIG. 1 (with the housing removed);

fig. 12 is an exploded view of the part B structure of fig. 11;

fig. 13 is a schematic structural view of the driving wheel in fig. 12;

FIG. 14 is a schematic view of the lower housing of FIG. 1;

FIG. 15 is a bottom view of FIG. 1 with the housing removed;

FIG. 16 is a schematic view of the structure of FIG. 1 with the housing removed;

FIG. 17 is a schematic view of the structure of FIG. 16 with the brackets removed;

FIG. 18 is a diagram of a test dosing regimen of an inhaler according to an embodiment of the present invention;

FIG. 19 is a diagram of a one-time administration method of an inhaler according to an embodiment of the present invention;

Fig. 20 is a diagram showing a method of replacing a medicine bottle of the inhaler according to the embodiment of the present invention.

FIG. 21 is a cross-sectional view of a dose counter assembly of example 2 of the present invention;

FIG. 22 is a schematic view of the structure of FIG. 21 with the mounting bracket removed;

FIG. 23 is a schematic view of the primary gear of FIG. 21;

FIG. 24 is a cross-sectional view of a dose counter assembly of example 3 of the present invention;

FIG. 25 is a schematic view of the structure of FIG. 24 with the mounting frame removed;

FIG. 26 is a schematic view of the structure of FIG. 25 in another direction;

FIG. 27 is a schematic view of the structure of the counting disk of FIG. 26;

FIG. 28 is a schematic view of the mounting bracket of FIG. 24;

fig. 29 is a schematic view of the structure of fig. 26 with the counting disk removed.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

Example 1

As shown in fig. 1 to 20, the inhaler of the present preferred embodiment includes a housing 1, a medicine bottle 2, and a dose counter assembly for displaying the remaining dose in the medicine bottle 2, and the medicine bottle 2 is detachably provided in the housing 1 and is movable up and down with respect to the housing 1. As shown in fig. 2, in this embodiment, the medicine bottle 2 may be a conventional aerosol can having a generally cylindrical can 21, a concave portion 24 recessed inward is provided on an outer peripheral wall of the can 21, a valve stem 22 located at a mouth portion of the can 21 protrudes from the mouth portion of the can 21, and the valve stem 22 has a tendency to protrude in a protruding direction by a built-in spring not shown in the figure, so that the mouth portion of the can 21 is normally kept in a closed state; if the body 21 of the inverted aerosol can is depressed against the elastic force of the spring, the valve stem 22 is pressed into the aerosol can, and aerosol containing medicine is ejected from the valve stem 22, wherein the medicine bottle 2 and the valve stem 22 are employed in the prior art, and the operation principle thereof will not be described in detail.

As shown in fig. 3-10, the dose counter assembly comprises a counter plate 7, a driving member and a linkage, wherein the driving member is a driving rod 8 capable of moving up and down along with the medicine bottle 2 along the axial direction, and the medicine bottle 2 moves to trigger the counter plate 7 to work or reset to an initial state (namely return to zero) by the following modes: the driving rod 8 is connected with the counting disc 7 through a linkage device to convert the linear motion of the driving rod 8 into the rotary motion of the counting disc 7 for counting, and when the driving rod 8 is separated from the medicine bottle 2, the driving rod 8 can drive the counting disc 7 to be separated from the linkage device, so that the counting disc 7 is reset to the initial state

In this embodiment, the upper portion of the housing 1 is provided with a mounting rack 641 having a receiving cavity 6412, the driving rod 8 can be movably disposed on the mounting rack 641, the lower end of the driving rod 8 abuts against the top of the medicine bottle 2, the upper portion faces the top wall of the mounting rack 641, and the driving rod 8 keeps a downward movement trend under the action of a first elastic member 8a, the first elastic member 8a is a spring, and two ends of the first elastic member abut against the top wall of the mounting rack 641 and the driving rod 8 respectively.

The counting disc 7 and the linkage device are arranged in the accommodating cavity 6412, and the counting disc 7 is positioned at one side of the driving rod 8 in the radial direction. The linkage device comprises a primary gear 91 and a second final gear 91a which are arranged on the mounting rack 641, the driving rod 8 and the primary gear 91 are connected through a driving structure to drive the primary gear 91 to rotate, the counting disc 7 is provided with a tooth part 71 meshed with the second final gear 91a, the second final gear 91a and the primary gear 91 are in indirect meshed transmission through at least one second intermediate gear 93, and the tooth part 71 and the primary gear 91 can be in direct meshed transmission. The counting disc 7 may also employ an incomplete gear, i.e. a distance between the first and last tooth of the teeth 71, to prevent the dose counting assembly from locking up as the inhaler is still used after it has been used to maximum dose.

The driving structure comprises a driving disc 81, wherein the driving rod 8, the driving disc 81 and the primary gear 91 are coaxially arranged and sequentially arranged from inside to outside, namely, the driving disc 81 is positioned between the driving rod 8 and the primary gear 91. The inner wall of the driving plate 81 is provided with a guide bar 811, the outer peripheral wall of the driving rod 8 is provided with a second guide groove 82 which is spirally arranged from top to bottom in the clockwise direction (overlooking direction of fig. 8), and the guide bar 811 is matched with the shape of the second guide groove 82 and is slidably embedded in the second guide groove 82.

When the can 21 moves downward to spray medicine, the driving rod 8 moves downward to the first position under the action of the first elastic member 8a, during this process, the guiding strip 811 moves along the second guiding groove 82 to rotate the driving disc 81 counterclockwise (as viewed in the plan view of fig. 6), and pushing portions 812 are disposed on the peripheral wall of the driving disc 81, in this embodiment, two pushing portions 812 are symmetrically disposed, please refer to fig. 7, and are located on the end portions of the elastic arms 81a extending along the circumferential direction, the front surface of the pushing portion 812 is a plane, the back side is a first guiding inclined surface 812a, and the pushing portion 812 can be drawn toward the center of the driving disc 81 when being pressed radially. While the inner peripheral wall of the primary gear 91 is provided with a plurality of second projections 911 which are circumferentially spaced apart and which are in engagement with the pushing portions 812, the second projections 911 are also provided with second guide slopes 911a which are matched with the back sides of the pushing portions 812. When the driving disk 81 rotates toward the front side of the pushing portion 812, the primary gear 91 can be rotated successively by the front side of the pushing portion 812 abutting against one of the second protrusions 911, so that the primary gear 91 rotates counterclockwise (as viewed in plan in fig. 6) and finally transmits power to the second final gear 91a by being pushed by the driving disk 81, thereby rotating the counter disk 7.

The mounting frame 641 is provided with a second window 651 in which the counting bar 73 of the counting disk 7 is partially exposed, or at least a part of the mounting frame 641 corresponding to the counting bar 73 is made of transparent material. In addition, the counting disc 7 is connected with a third torsion spring 72, the other end of the third torsion spring 72 is connected with a mounting rack 641, the third torsion spring 72 is a torsion spring capable of being compressed axially, and the third torsion spring 72 stores energy gradually as the counting disc 7 rotates in the counting increasing direction.

When the can 21 moves upward and is in a reset state, the driving rod 8 moves upward under the pushing action of the can 21 to a second position, in the process, the guide bar 811 moves along the second guide groove 82 to enable the driving disc 81 to rotate clockwise (in the overlook direction of fig. 6), the front surface of the pushing part 812 is firstly separated from contact with the second bump 911 abutted against the driving bar, when the driving bar rotates to the next second bump 911, the pushing part 812 is radially pressed and then inwards closed under the contact guide of the corresponding first guide inclined surface 812a and the second guide inclined surface 911a, and when the pushing part 812 passes over the next second bump 911, the front surface of the pushing part 812 is abutted against the next second bump 911 under the restoring action of the elastic arm 81a, and at the moment, the driving rod 8 also moves to the second position just. Thus, when the can 21 moves downward again to cause the driving rod 8 to move downward again, the front surface of the pushing portion 812 pushes the next second bump 911 to rotate the driving disk 81 counterclockwise (in the top view direction of fig. 6), and the primary gear 91 can be rotated successively. This is repeated until the medicament in the canister 21 has been used, at which point the counter disk 7 displays the maximum number set.

When the tank 21 moves upward and the driving lever 8 moves upward to the second position, the primary gear 91 is kept stationary; however, when the driving disk 81 rotates clockwise (in the plan view of fig. 6) with respect to the primary gear 91, friction is generated between the driving disk 81 and the primary gear 91 to slightly rotate, and in order to prevent this, the primary gear 91 is provided with a first stopper 912, the mounting bracket 641 is provided with a second stopper 6411 having elasticity and engaged with the first stopper 912, and the resistance of the second stopper 6411 is larger than the friction between the driving disk 81 and the primary gear 91 to prevent the clockwise (in the plan view of fig. 6) rotation of the primary gear 91.

When the medicine in the canister 21 is used and a new medicine bottle 2 needs to be replaced, in order to continue to use the dose counting assembly, a deflector rod 84 extending radially above the counting disc 7 is further arranged on the driving rod 8, the driving rod 8 moves downwards under the action of the first elastic member 8a until reaching the third position in the state that the medicine bottle 2 is moved out of the shell 1, and the counting disc 7 moves downwards under the pushing of the deflector rod 84 until being disengaged from the second final gear 91a in the process that the driving rod 8 is at the first position to the third position, and at the moment, the counting disc 7 rotates reversely under the action of the third torsion spring 72 to return to the initial state. The travel of the drive lever 8 to the third position is greater than the travel of the drive lever 8 to the first position, and the toggle lever 84 is located above the counter disk 7 when the drive lever 8 is moved to the first position.

When the newly replaced medicine bottle 2 is loaded, the driving lever 8 is moved upward to the second position by the pushing of the medicine bottle 2, and at this time the counter plate 7 is moved upward to engage with the second final gear 91a by the third torsion spring 72.

From the above, in the state that the canister 21 moves down to spray medicine, the driving rod 8 moves down to the first position and the counting disc 7 rotates by a certain angle to realize one-time counting; in the case of an upward movement of the tank 21 into the reset state, the drive rod 8 is moved upward into the second position, while the counter disk 7 remains stationary throughout the process; in a state in which the vial 2 is moved out of the housing 1 and out of contact with the drive lever 8, the drive lever 8 is moved down to the third position and the counter disk 7 is reset to an initial state (i.e., zero position) by the third torsion spring 72.

As shown in fig. 1,2, 11 to 17, the connection structure for releasing the medicine bottle 2 from contact with the driving lever 8 and the actuating assembly for driving the can 21 to move downward may have various structures, and one embodiment is as follows.

As shown in fig. 1 and 2, the housing 1 is formed by connecting an upper housing 1a and a lower housing 1b, a suction nozzle 11 is formed on the lower housing 1b, and a detachable cover on the suction nozzle 11 is provided with a suction nozzle cover 111 for closing the suction nozzle 11. The medicine bottle 2 is inversely arranged in the shell 1 from top to bottom, the tank body 21 can move downwards relative to the shell 1 under the drive of the actuating component to spray medicine, the valve rod 22 of the tank body is inserted in the spray head 12, the spray head 12 is inserted on the bracket 17 arranged in the lower shell, and the spray head 12 is provided with the spray hole 121 facing the suction nozzle 11, so that the medicine in the medicine bottle 2 is sprayed from the spray hole 121 and sucked by a patient through the suction nozzle 11.

However, the inhalation of the medicament at the mouthpiece 11 while operating the actuation assembly is inconvenient and laborious for the patient, and this problem is solved by providing the energy storage assembly and the stop assembly described above.

The energy storage assembly is connected with the actuating assembly and enables the actuating assembly to have a tendency to drive the medicine bottle 2 downwards, while the stop assembly always has a tendency to contact the actuating assembly to limit the actuating assembly to drive the medicine bottle 2 downwards, and can be separated from contact with the actuating assembly under the driving of the air flow generated by the suction force at the suction nozzle 11 to release the limitation of the actuating assembly. In this way, the patient only needs to store energy to the actuating assembly through the energy storage component, so that the actuating assembly has a tendency to drive the medicine bottle 2 to move downwards, then the suction nozzle 11 is used for sucking air to enable the flowing air flow to drive the stop assembly, so that the stop assembly releases the limit on the actuating assembly, and then the medicine bottle 2 can move downwards to spray medicine under the drive of the actuating assembly. The operation mode does not need to press or operate a certain part all the time, and the operation is labor-saving.

When a user inhales at the suction nozzle 11, the air intake at the gap where the housing 1 is assembled can be used to drive the stop assembly, but it is preferable that the lower housing 1b of the present embodiment is provided with a plurality of air inlets communicating with the suction nozzle 11, and for distinguishing, the air flow coming from one of the air inlets can drive the stop assembly, and the air inlet is called a first air inlet 13a.

As shown in fig. 11 to 17, a fixing frame 5 connected with the tank body 21 through a clamping structure is sleeved on the medicine bottle 2, the fixing frame 5 comprises an upper fixing frame 54 and a lower fixing frame 55 which are fixedly connected, the upper fixing frame 54 is encircling the tank body 21, and the lower fixing frame 55 is positioned outside the spray head 12. The energy storage assembly comprises a tightening sleeve 6 and a second torsion spring 61 which are arranged in the shell 1, the tightening sleeve 6 is sleeved outside the upper fixing frame 54, a sleeve 64 is arranged between the tightening sleeve and the upper fixing frame, the sleeve 64 can move up and down relative to the shell 1 and can rotate circumferentially, a knob positioned at the upper part of the shell 1 is formed at the upper end of the sleeve 64, the knob is a mounting rack 641, and the sleeve 64 is connected with the tightening sleeve 6 through a detachable connecting structure. The upper fixing frame 54 is formed with a second elastic fastening foot 53, the second fastening foot 53 is matched with the concave portion 24 of the medicine bottle 2, and the second fastening foot 53 and the concave portion 24 form the above-mentioned fastening structure, that is, after the medicine bottle 2 is inserted into the shell 1, the second fastening foot 53 on the upper fixing frame 54 extends into the concave portion 24 of the medicine bottle 2 to position the medicine bottle 2. However, in order to prevent the medicine bottle 2 from being displaced relative to the upper fixing frame 54 axially under the action of external force, the sleeve 64 is utilized in this embodiment, and when the sleeve 64 is inserted between the tightening sleeve 6 and the upper fixing frame 54, the clamping structure is locked by the sleeve 64, that is, the second buckling leg 53 can be prevented from being sprung outwards, that is, the second buckling leg 53 is firmly limited in the concave portion 24, so that the fixing frame 5 is pressed on the can body 21, and the fixing frame 5 and the can body 21 are relatively fixed in the axial direction.

The detachable connection structure between the sleeve 64 and the tightening sleeve 6 includes an L-shaped groove 65 provided on the inner wall of the tightening sleeve 6 and an insert 642 provided on the outer wall of the sleeve 64, the L-shaped groove 65 extends downward from the upper edge of the tightening sleeve 6, and the insert 642 is inserted into the L-shaped groove 65. So, insert 642 can realize the assembly of sleeve 64 and screw up cover 6 from the vertical section of L type groove 65 to the horizontal segment that slides down, insert 642 can realize the dismantlement of sleeve 64 and screw up cover 6 from the horizontal segment of L type groove 65 to slide into the vertical section and upwards remove, after sleeve 64 upwards shifts out casing 1, the joint structure is unlocked, second detain the foot 53 to the direction of keeping away from medicine bottle 2 pops out, and no longer compress tightly in recessed portion 24, namely the tight fit between second detain foot 53 and the recessed portion 24 disappears, medicine bottle 2 can be shifted out in order to change new medicine bottle 2 from casing 1. Of course, the detachable connection structure between the sleeve 64 and the tightening sleeve 6 is not limited to that shown in this embodiment.

As shown in fig. 16 and 17, the actuating assembly includes a driving wheel 31, a first intermediate gear 33, a first final gear 32, and a blocking block 321, where the first intermediate gear 33 and the first final gear 32 are both disposed on the support 17, the blocking block 321 is disposed on the first final gear 32, a driving tooth portion 311 is circumferentially disposed on the driving wheel 31, and the driving tooth portion 311 and the first final gear 32 are indirectly engaged with each other through at least one first intermediate gear 33, and the first intermediate gear 33 and the first final gear 32 may be dual gears, and of course, the driving tooth portion 311 and the first final gear 32 may also be directly engaged with each other.

The stop assembly comprises a stop seat 4 arranged on the bracket 17 and capable of rotating relative to the bracket 17 (the bracket 17 is fixed on the shell 1), a stop block 41 arranged on the stop seat 4 and a stop plate 44 positioned in a channel between the first air inlet 13a and the suction nozzle 11, wherein the bracket 17 is also provided with a stop plate 171, when the clamping block 321 is in a state of abutting against the stop block 41, the stop plate 44 abuts against the stop plate 171, and the wall surface of the stop block 41 contacted with the clamping block 321 is an arc surface, as shown in fig. 15. Wherein the stop plate 44 of the stop seat 4 is driven to rotate (rotate counterclockwise in fig. 15) relative to the bracket 17 by an air flow (air flow shown by an arrow in fig. 15) entering at the first air inlet 13a or an external force to disengage the catch block 321 from the stop block 41, and the stop seat 4 always has a tendency to rotate under the action of the first torsion spring 42 until the catch block 321 abuts against the stop block 41, and one end of the first torsion spring 42 is connected to the stop seat 4 and the other end is connected to the bracket 17. The stop plate 44 and the stop plate 171 are in gear engagement to prevent the stop seat 4 from rotating under the drive of the first torsion spring 42 to a state in which the blocking block 321 is in gear engagement with the stop block 41, and the stop seat 4 continues to rotate, so that the blocking block 321 is out of contact with the stop block 41 again.

The arc surface design has the advantage that the stop block 41 can release the blocking and matching of the blocking and propping block 321 by applying small force to the stop seat 4, so as to achieve the effect of 'four-two jack pulling'.

The driving wheel 31 and the tightening sleeve 6 are coaxially arranged, and the upper part of the driving wheel 31 is sleeved on the lower part of the tightening sleeve 6, in the embodiment, in the assembled state of the sleeve 64 and the tightening sleeve 6, the knob rotates 180 degrees, the tightening sleeve 6 rotates along with the rotation of the knob in the circumferential direction relative to the shell 1, and a positioning structure which is positioned relative to the shell after the rotation of the tightening sleeve 6 is arranged between the tightening sleeve 6 and the shell 1; and the two ends of the second torsion spring 61 are respectively connected with the tightening sleeve 6 and the driving wheel 31, so that the driving wheel 31 also has a tendency to rotate around the axis of the driving wheel, namely the energy storage assembly completes the energy storage of the actuating assembly. However, due to the blocking engagement between the blocking block 321 and the stop block 41, the driving wheel 31 cannot rotate, and the user needs to inhale at the suction nozzle 11 to rotate the stop seat 4, so that the stop block 41 releases the restriction on the blocking block 321, and then the driving wheel 31 can rotate.

As shown in fig. 12 and 13, the driving wheel 31 rotates to drive the medicine bottle 2 to move downwards through the following transmission structure: the lower part cover of action wheel 31 is located the lower mount 55 outside, be equipped with first lug 312 on the inner wall of action wheel 31, be equipped with the first guide way 51 that supplies first lug 312 slip gomphosis on the outer wall of lower mount 55, first guide way 51 is along action wheel 31 circumference top-down heliciform extension, first guide way 51 is at least two, along circumference interval distribution, link up between two adjacent first guide ways 51 and supply first lug 312 to remove from a first guide way 51 to another first guide way 51's horizontal part 52, the travel time of first lug 312 on horizontal part 52 and medicine bottle 2 spout medicine time looks adaptation. Thus, when the driving wheel 31 rotates, the first protruding block 312 rotates along the lower position of the first guiding groove 51 to the higher position side, the first guiding groove 51 is pressed in the process to enable the lower fixing frame 55 to drive the tank body 21 to move downwards, when the first protruding block 312 moves to the horizontal portion 52, the medicine bottle 2 starts to spray medicine, and when the medicine spraying is finished, the first protruding block 312 moves to the upper area of the lower position of the other first guiding groove 51, at the moment, the tank body 21 moves upwards to reset under the action of the built-in spring, the first protruding block 312 is propped against the lower position of the other first guiding groove 51, so that the process is repeated, and the medicine bottle 2 is driven to move downwards to spray medicine as required.

In order to enable a user to know the energy storage condition of the energy storage assembly on the actuating assembly, a fixing piece 18 sleeved on the tightening sleeve 6 is fixedly arranged in the shell 1, and the tightening sleeve 6 can rotate relative to the fixing piece 18. The inner wall of the fixing piece 18 is provided with a buckling groove 15, the outer wall of the tightening sleeve 6 is provided with a first buckling leg 62 which has elasticity and can be buckled into the buckling groove 15, and the first buckling leg 62 and the buckling groove 15 form the positioning structure. When the first fastening pin 62 is fastened in the fastening slot 15, an audible "click" sound can be generated due to the restoring force of the first fastening pin 62 striking the inner wall of the fastening slot 15. Because of the difficulty in one-time 180 ° rotation operation, in this embodiment, four buckling grooves 15 are uniformly distributed, two first buckling legs 62 are symmetrically arranged, i.e. two clicking sounds can be heard, and at this time, the driving wheel 31 cannot rotate, so that the second torsion spring 61 is in an energy storage state. In this state, the front surface of the first leg 62 abuts against the locking groove 15, so that the tightening sleeve 6 does not rotate counterclockwise (in the top view of fig. 11) to release the energy from the second torsion spring 61.

In addition, the tightening sleeve 6 is circumferentially provided with the identification strip 63, the driving wheel 31 and the housing 1 are respectively provided with the first window 16 in which the identification strip 63 is partially exposed, and of course, the positions of the driving wheel 31 and the housing 1 corresponding to the identification strip 63 may be at least partially made of transparent materials. The indicator strip 63 may be provided as a color-changing strip, such as a red color for the indicator strip 63 at the first window 16 when the actuation assembly is in the stored energy state, and a white color for the indicator strip 63 at the first window 16 after the actuation assembly is completed. Of course, the identification strip 63 may also be in the form of an alphanumeric character, a number, or the like.

As shown in fig. 14 and 15, in order to enable the inhaler to be suitable for users of different ages and different physical conditions, a second air inlet 13b is further disposed at the lower portion of the housing 1 and is communicated with the nozzle 121, a baffle 131 capable of moving relative to the second air inlet 13b is disposed at the second air inlet 13b, and the baffle 131 can shield at least part of the second air inlet 13b. Two guide bars 132 extending from top to bottom are oppositely arranged on the inner wall of the shell 1, the two guide bars 132 are respectively positioned at two sides of the second air inlet 13b, two opposite side walls of the baffle plate 131 are respectively movably inserted into the guide bars 132 at the corresponding sides, and the air inlet amount of the second air inlet 13b is adjusted by moving the baffle plate 131 up and down. For example, for a child, the air intake amount at the second air inlet 13b can be reduced, so that most air flows enter from the first air inlet 13a, and the stop plate 44 of the stop seat 4 is easy to push to rotate so as to release the limit on the actuating assembly, so that the child can ensure that the suction force is enough to enable the medicine to enter the lung without using excessive suction force; for an adult, the air intake amount at the second air inlet 13b may be increased, so that the air flow entering from the first air inlet 13a is smaller, and the user needs to use a larger suction force to rotate the stopping seat 4 to release the restriction on the actuating assembly, otherwise, the adult cannot ensure that the medicine enters the lung when exerting too little force.

Preferably, a scale may be marked at the second air inlet 13b capable of adjusting the amount of air intake to alert the user that the baffle 131 may be moved to a suitable scale. Of course, the number of air intakes is not limited to two.

As shown in fig. 16 and 17, since the medicine ejected from the new vial 2 is mixed with air bubbles when it is just started to be used, the stopper seat 4 is provided with a dial 43 extending out of the housing 1, and the housing 1 is provided with a stopper groove 14 for extending the dial 43 and restricting the movement stroke of the dial 43. The stop seat 4 is rotated counterclockwise in fig. 15 by manually applying force to the dial block 43, and the stop block 41 is driven to rotate to release the restriction on the actuation assembly so as to view the ejected medicine state.

When the inhaler is initially used, the spray state is tested according to the method shown in fig. 18, the knob is rotated clockwise (according to the overlooking direction of fig. 11), the rotation is stopped after two clicking sounds are detected, and at the moment, the red color is displayed at the first window 16 to indicate that the energy storage assembly has completed energy storage work; then the suction nozzle cover 111 is pulled out, the pulling block 43 is pulled to drive the stop seat 4 to rotate anticlockwise according to fig. 15, the stop block 41 leaves the clamping block 321, the actuating component rotates under the action of the second torsion spring 61, the medicine bottle 2 is driven to move downwards, spraying is started, and the spraying state is checked; if the spraying state is normal, the suction nozzle cover 111 is covered back to be ready for the next use, and if the spraying state is abnormal, the knob is rotated again to repeat the above steps.

The method of using the medicine once in practice is as follows in the method shown in fig. 19: 1. firstly, the air inlet quantity of the second air inlet 13b is adjusted to a proper size; 2. then, firstly checking the residual dose in the medicine bottle 2 from the counting disc 7, and replacing the medicine bottle 2 if the residual dose is not available; 3. if the remaining dose exists, the knob is rotated clockwise (according to the overlooking direction of fig. 11), and the rotation is stopped after two clicking sounds are heard, and at the moment, the red color is displayed at the first window 16 to indicate that the energy storage assembly has completed energy storage work; 4. then the suction nozzle cover 111 is pulled out to contain the suction nozzle 11 for forceful suction, at this time, the air flow entering at the first air inlet 13a pushes the stop plate 44 and drives the stop seat 4 to rotate anticlockwise according to fig. 15, the stop block 41 leaves the blocking block 321, the actuating component rotates under the action of the second torsion spring 61 and drives the medicine bottle 2 to move downwards so as to start spraying, and the counting disc 7 rotates in the suction process; 5. after the medicine ejection is completed, the mouthpiece cover 111 is covered back to be ready for the next use.

As shown in fig. 20, the method of replacing the vial 2 includes rotating the knob in a counterclockwise direction (in the plan view of fig. 11), removing the insert 642 from the sleeve 64 from the L-shaped groove 65 of the tightening sleeve 6, removing the sleeve 64, then pulling out the vial 2, rotating the counter plate 7 to a reset-zero state after the vial 2 is removed, then loading a new vial 2, and then returning the sleeve 64, and rotating the knob clockwise (in the plan view of fig. 11) again to position the insert 642 on the sleeve 64 in the horizontal section of the L-shaped groove 65 of the tightening sleeve 6, thereby locking the sleeve 64 in the tightening sleeve 6.

Example 2

Embodiment 2 differs from embodiment 1 in the driving structure.

As shown in fig. 21 to 23, in the present embodiment, the driving structure includes the driving arm 83 extending in the radial direction of the driving lever 8 and a plurality of guide portions 92 provided on the inner peripheral wall of the primary gear 91 in order in the circumferential direction, each guide portion 92 includes a first guide block 921 having a first inclined surface portion 9211 and a second guide block 922 having a second inclined surface portion 9221 provided in the circumferential direction, the first inclined surface portion 9211 is located at the top of the first guide block 921, the second inclined surface portion 9221 is located at the bottom of the second guide block 922, both the first inclined surface portion 9211 and the second inclined surface portion 9221 are inclined in the circumferential direction from top to bottom and the inclination directions are opposite, the second inclined surface portion 9221 communicates with the first inclined surface portion 9211 of the adjacent guide portion 92, in other words, if the first inclined surface portion 9211 is inclined in the clockwise direction (in the top view direction of fig. 23) from top to bottom, the second inclined surface portion 9221 is inclined in the counterclockwise direction (in the top view of fig. 23). The driving arm 83 has one end connected to the driving lever 8 and the other end in guiding engagement with the first and second inclined surface portions 9211 and 9221 to drive the primary gear 91 to rotate.

In this embodiment, a first through slot 923 for the driving arm 83 to pass through is provided between the first guide block 921 and the second guide block 922 of each guide portion 92, and a second through slot 924 for the driving arm 83 to pass through is provided between each second guide block 922 and the first guide block 921 of the adjacent guide portion 92.

In this embodiment, the driving rod 8 is provided with a mounting groove 85 extending along a radial direction, one end of the driving arm 83 is mounted in the mounting groove 85, the other end is guided and matched with the first inclined surface portion 9211 and the second inclined surface portion 9221, a second elastic member 831 having a radial outward moving trend relative to the driving rod 8 is provided in the mounting groove 85, the second elastic member 831 is a spring, two ends respectively abut against the mounting groove 85 and the driving arm 83, and the second elastic member 831 plays a role of buffering to prevent interference between the driving arm 83 and the guiding portion 92.

When the driving lever 8 moves downward, the driving arm 83 moves to the lower side along the upper part of the first inclined surface portion 9211 to push the primary gear 91 to rotate a certain angle counterclockwise (as viewed in the top view of fig. 22), and when the driving lever 8 moves upward, the driving arm 83 moves to the upper side along the lower part of the second inclined surface portion 9221 after passing through the first through groove 923 to push the primary gear 91 to continue to rotate a certain angle counterclockwise (as viewed in the top view of fig. 22), and then reaches the first inclined surface portion 9211 of the next guide portion 92 through the second through groove 924.

As is clear from the above, in the course of the drive lever 8 moving down to the first position, the drive arm 83 moves along the first inclined surface portion 9211; during the upward movement of the drive lever 8 to the second position, the drive arm 83 moves along the second inclined surface portion 9221, i.e., one count of the count plate 7 is completed by one spraying and resetting of the medicine bottle 2.

Example 3

Embodiment 3 differs from embodiment 1 in that the counter plate 7 is engaged with the second final gear 91a in a different manner:

As shown in fig. 24-29, the inner peripheral wall of the counting disc 7 is provided with teeth 71 locally in the circumferential direction, i.e. with a certain distance between the first and last teeth of the teeth 71, to prevent the dose counting assembly from locking up as the inhaler is used up to a maximum dose and still continues to be used. A rotor 91b is coaxially mounted on the upper portion of the second final gear 91a, and three teeth 91c capable of meshing with the teeth 71 are circumferentially spaced apart from each other on the outer peripheral wall of the rotor 91 b.

The center of the counting disc 7 is recessed downwards to form a groove 75, the upper end of the driving rod 8 penetrates through the counting disc 7 and is positioned in the groove 75, a third stop block 751 extending in the up-down direction is arranged on the inner side wall of the groove 75, and a fourth stop block 86 which is matched with the third stop block 751 in a blocking mode is arranged on the driving rod 8.

In this embodiment, the two ends of the first elastic member 8a respectively abut against the top wall 6410 of the mounting frame 641 and the driving rod 8, one end of the third torsion spring 72 is connected to the counting plate 7, the other end is connected to the fixing member 6415 fixedly provided in the accommodating chamber 6412, and the third torsion spring 72 is a torsion spring capable of being compressed in the axial direction. The top of the counting disc 7 is provided with at least one clamping protrusion 7a, the top wall 6410 of the mounting frame 641 is provided with a plurality of clamping grooves 6413 which are in clamping fit with the clamping protrusions 7a along the circumferential direction, and the clamping protrusions 7a can be arranged on the top wall 6410 of the mounting frame 641, and the clamping grooves 6413 can be arranged on the top of the counting disc 7.

The operation of the driving rod 8 of the present embodiment moving to the first position and the second position is substantially the same as that of the first embodiment, except that the tooth 91c of the rotating member 91b is engaged with the counting plate 7 to further push the counting plate 7 to rotate, and in the state that the driving rod 8 is in the first position and the second position, the locking protrusion 7a is always locked in the locking groove 6413, and in the process that the driving rod 8 is in the first position to the third position, the counting plate 7 can move downward along with the driving rod 8 to separate the locking protrusion 7a from the locking groove 6413, and the counting plate 7 always has a tendency to move upward under the action of the third torsion spring 72 to lock the locking protrusion 7a in the locking groove 6413.

The driving lever 8 of the present embodiment is moved to the third position as follows:

In the process of moving the driving lever 8 to the third position, the fourth stopper 86 moves downward therewith, and in the process of moving the driving lever 8 to the first position to the third position, the fourth stopper 86 moves downward to the bottom wall of the groove 75 and continues to move downward, thereby pushing the counting disk 7 to move downward integrally so that the click protrusion 7a and the click groove 6413 are disengaged, and the toothless portion on the rotating member 91b faces the counting disk 7 when the last counting of the counting disk 7 is completed, so that the counting disk 7 rotates in the opposite direction (the rotating direction relative to the counting of the counting disk 7) under the action of the third torsion spring 72 until the third stopper 751 and the fourth stopper 86 are engaged, and the counting disk 7 is reset to the zero position.

After the new and replaced medicine bottle 2 is filled, the driving rod 8 moves upwards to the second position under the pushing of the medicine bottle 2, in the process, the fourth stop block 86 moves upwards without pushing the bottom wall of the groove 75, and the counting disc 7 also moves upwards under the action of the third torsion spring 72 until the clamping protrusion 7a is clamped and matched with the clamping groove 6413 again.

Claims

1. A dose counter assembly for an inhaler comprising a counter plate (7) for displaying the remaining dose in a vial (2) and a drive member for cooperating with the vial (2) in the inhaler, characterized in that: the driving piece is a driving rod (8) which can move up and down along with the medicine bottle (2) along the axial direction, the driving rod (8) is connected with the counting disc (7) through a linkage device so as to convert the linear motion of the driving rod (8) into the rotary motion of the counting disc (7) to count, and when the driving rod (8) is separated from the medicine bottle (2), the driving rod (8) can drive the counting disc (7) to be separated from the linkage device so as to reset the counting disc (7) to an initial state; the lower end of the driving rod (8) is used for propping against the top of the medicine bottle (2), a first elastic piece (8 a) is arranged at the same time, and the driving rod (8) always keeps a downward movement trend under the action of the first elastic piece (8 a);

In the state that the tank body (21) of the medicine bottle (2) moves downwards to spray medicine, the driving rod (8) moves downwards to a first position, and the counting disc (7) rotates for a certain angle;

When the tank body (21) of the medicine bottle (2) moves upwards to a reset state, the driving rod (8) moves upwards to a second position, and the counting disc (7) keeps static or continuously rotates for a certain angle;

In a state that the medicine bottle (2) is separated from the driving rod (8), the driving rod (8) moves downwards to a third position, the counting disc (7) is reset to an initial state under the action of a third torsion spring (72), and the stroke of the driving rod (8) moving to the third position is larger than the stroke of the driving rod (8) moving to the first position;

The driving rod (8) is movably arranged on the mounting frame (641), the linkage device comprises a primary gear (91) and a second final gear (91 a) which are arranged on the mounting frame (641), the driving rod (8) is connected with the primary gear (91) through a driving structure, a tooth part (71) meshed with the second final gear (91 a) is arranged on the counting disc (7), and the second final gear (91 a) is directly meshed with the primary gear (91) or indirectly meshed with the second intermediate gear (93) for transmission.

2. A dose counter assembly for an inhaler as claimed in claim 1, wherein: the driving structure comprises a driving disc (81), wherein the driving rod (8), the driving disc (81) and a primary gear (91) are coaxially arranged and sequentially arranged from inside to outside, a guide strip (811) is arranged on the inner wall of the driving disc (81), a second guide groove (82) which is spirally arranged from top to bottom along the circumferential direction is arranged on the peripheral wall of the driving rod (8), and the guide strip (811) is slidably embedded in the second guide groove (82); an elastic pushing part (812) is arranged on the outer peripheral wall of the driving disc (81), and a plurality of second protruding blocks (911) which are distributed at intervals along the circumferential direction and are blocked and matched with the pushing part (812) are arranged on the inner peripheral wall of the primary gear (91).

3. A dose counter assembly for an inhaler as claimed in claim 2, wherein: the driving disc (81) is provided with an elastic arm (81 a) extending along the circumferential direction on the outer circumferential wall, the pushing part (812) is arranged at the end part of the elastic arm (81 a), the front side of the pushing part (812) is a plane, the back side of the pushing part is a first guiding inclined plane (812 a), and the second protruding block (911) is also provided with a second guiding inclined plane (911 a) matched with the first guiding inclined plane (812 a) of the pushing part (812).

4. A dose counter assembly for an inhaler as claimed in claim 1, wherein: the primary gear (91) is sleeved on the driving rod (8), the driving structure comprises a driving arm (83) extending radially along the driving rod (8) and a plurality of sequentially arranged guide portions (92) arranged on the inner peripheral wall of the primary gear (91) along the circumferential direction, each guide portion (92) comprises a first guide block (921) with a first inclined surface portion (9211) and a second guide block (922) with a second inclined surface portion (9221) which are arranged along the circumferential direction, the first inclined surface portion (9211) and the second inclined surface portion (9221) incline from top to bottom along the circumferential direction and are opposite in inclination direction, the second inclined surface portion (9221) is communicated with the first inclined surface portion (9211) of the adjacent guide portion (92), one end of the driving arm (83) is connected with the driving rod (8), and the other end of the driving arm is matched with the first inclined surface portion (9211) and the second inclined surface portion (9221) in a guiding mode to drive the primary gear (91) to rotate.

5. A dose counter assembly for an inhaler as claimed in claim 4, wherein: the driving arm (83) is movably arranged on the driving rod (8), and a second elastic piece (831) which enables the driving arm (83) to always have a radially outward moving trend relative to the driving rod (8) is arranged between the driving arm and the driving rod.

6. A dose counter assembly for an inhaler according to any one of claims 1 to 5, wherein: the tooth part (71) is arranged on the peripheral wall of the counting disc (7) and the counting disc (7) is positioned on one side of the driving rod (8) in the radial direction, a deflector rod (84) which radially extends to the upper part of the counting disc (7) is arranged on the driving rod (8), the counting disc (7) moves downwards under the pushing of the deflector rod (84) and is disengaged with the second final-stage gear (91 a) in the process of the driving rod (8) from the first position to the third position, and the third torsion spring (72) is a torsion spring which can be axially compressed.

7. A dose counter assembly for an inhaler according to any one of claims 1 to 5, wherein: the tooth parts (71) are circumferentially arranged on the inner peripheral wall of the counting disc (7), a rotating piece (91 b) is coaxially arranged on the upper part of the second final gear (91 a), at least one tooth (91 c) which can be meshed with the tooth parts (71) is circumferentially distributed on the outer peripheral wall of the rotating piece (91 b) at intervals, and the top of the counting disc (7) is in snap fit with the top wall (6410) of the mounting frame (641) through a clamping protrusion (7 a) and a clamping groove (6413);

The counting disc (7) is sleeved on the driving rod (8), and the counting disc (7) can be separated from the clamping protrusion (7 a) and the clamping groove (6413) along with the downward movement of the driving rod (8) only in the process that the driving rod (8) is in the first position to the third position; the third torsion spring (72) is a torsion spring capable of being compressed axially, and the counting disc (7) always has a trend of moving upwards under the action of the third torsion spring (72) so that the clamping convex part (7 a) is clamped in the clamping groove (6413).

8. A dose counter assembly for an inhaler as claimed in claim 1, wherein: the counting disc (7) is locally provided with the tooth part (71).

9. A dose counter assembly for an inhaler as claimed in claim 1, wherein: the counting disc (7) is provided with a counting bar (73), the mounting frame (641) is provided with a second window (651) for exposing the counting bar (73) at least partially, or the part of the mounting frame (641) corresponding to the counting bar (73) is at least partially made of transparent materials.