An automatic injection pen

Abstract

The present application relates to the technical field of medical devices, and discloses an automatic injection pen, which comprises a shell, a needle cylinder, a plunger, a driving assembly, a first sound-emitting component and a second sound-emitting component. The needle cylinder is connected to the shell and can move in a first direction. The plunger is arranged in the shell, and the length direction of the plunger is the same as the first direction. The plunger and the needle cylinder are arranged in the first direction, and the plunger at least partially extends into the needle cylinder and can move in the first direction. The first sound-emitting component is connected to the plunger and located outside the needle cylinder. The second sound-emitting component is arranged in the shell and located between the first sound-emitting component and the needle cylinder in the first direction. In actual application, the plunger is driven by the driving assembly to move in the first direction towards the side where the needle cylinder is located, so as to push the medicament in the needle cylinder out. When the plunger travels to a preset position, the first sound-emitting component is coupled with the second sound-emitting component and emits a sound prompt, so that the patient can clearly know the injection progress.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an automatic injection pen. BACKGROUND

[0002] An automatic injection pen is a kind of medical device used to assist drug injection, wherein the efficacy of many drugs, such as insulin, is closely related to the accurate injection dose, and insufficient dose will have adverse effects on the patient's blood glucose control. During the injection process, the patient cannot clearly know the injection progress, and the patient may prematurely remove the injection pen from the injection site due to distraction, nervousness or inaccurate time control, etc., which affects the efficacy. Therefore, it is particularly important for the patient to exactly know the injection progress in actual application. SUMMARY

[0003] The primary object of the present application is to provide an automatic injection pen capable of prompting the injection progress.

[0004] To achieve the above object, the present application provides an automatic injection pen comprising a housing, a needle cylinder, a plunger, a driving assembly, a first sound emitting component and a second sound emitting component.

[0005] The housing has a first direction.

[0006] The needle cylinder is connected in the housing, and the needle cylinder is movable along the first direction.

[0007] The plunger is arranged in the housing, the length direction of the plunger is the same as the first direction, the plunger and the needle cylinder are arranged along the first direction, and the plunger at least partially extends into the needle cylinder, and the plunger is movable along the first direction.

[0008] The driving assembly is connected to the housing, and the driving assembly is used to drive the plunger to move along the first direction towards the side where the needle cylinder is located, so as to push the medicament in the needle cylinder out.

[0009] The first sound emitting component is connected to the plunger, and the first sound emitting component is located outside the needle cylinder.

[0010] The second sound emitting component is arranged in the housing, and in the first direction, the second sound emitting component is located between the first sound emitting component and the needle cylinder.

[0011] The second sound emitting component is used to be coupled with the first sound emitting component to emit sound prompt.

[0012] In a specific embodiment of the present application, the plunger comprises a plunger body and a pushing member.

[0013] The length direction of the column is the same as the first direction, the column is arranged in the shell, and the column at least partially extends into the needle cylinder;

[0014] The pushing member is detachably connected to the column, and the pushing member is located outside the needle cylinder;

[0015] The first sound generating component is connected to the outer circumferential surface of the column, and the second sound generating component is connected to the pushing member;

[0016] The driving assembly is used for driving the column to move in the first direction, the pushing member is used for driving the needle cylinder to move from a first preset position to a second preset position in the first direction under the action of the driving assembly, when the needle cylinder is located at the second preset position, the needle cylinder is fixedly arranged, the pushing member is separated from the column, and the column continues to move under the action of the driving assembly to push the medicament in the needle cylinder out.

[0017] In a specific embodiment of the present application, the driving assembly comprises a locking member and an elastic member, the locking member is connected to the shell, in the first direction, the locking member is detachably connected to one end of the column away from the needle cylinder, the elastic member is arranged in the shell, and the elastic member connects the shell and the column, and the elastic member is used for driving the column to move in the first direction after the locking member is separated from the column.

[0018] In a specific embodiment of the present application, the first sound generating component has a guide slope surface, one side of the first sound generating component away from the column and one side of the first sound generating component towards the needle cylinder are connected through the guide slope surface, the guide slope surface extends in the first direction from outside to inside, and an avoiding space is formed between one side of the first sound generating component away from the column and the inner wall surface of the shell;

[0019] The second sound generating component comprises a connecting column and a buckle body, the length direction of the connecting column is the same as the first direction, one end of the connecting column in the first direction is connected to one side of the pushing member away from the needle cylinder, and the other end of the connecting column is connected to the buckle body;

[0020] In the first direction, the buckle body at least partially faces the guide slope surface, in the radial direction of the column, one side of the connecting column away from the column and the inner wall surface of the shell have a preset distance, the connecting column can be deformed towards the side where the inner wall surface of the shell is located under the action of the first sound generating component, and the avoiding space is used for the connecting column to pass through.

[0021] In one specific embodiment of the present application, in the first direction, the elastic member is arranged on the side of the first sound production component away from the second sound production component, one end of the elastic member is connected with the column through the first sound production component in the first direction, and the other end is connected with the shell.

[0022] In one specific embodiment of the present application, the elastic member is a spring, and the elastic member is sleeved on the outer periphery of the column.

[0023] The first sound production component is annular, and the first sound production component is arranged around the axis of the column.

[0024] In the radial direction of the column, the connecting column is arranged on the end of the pushing member away from the column.

[0025] In one specific embodiment of the present application, the first sound production component has a plurality of limiting portions, the plurality of limiting portions are arranged on the outer wall surface of the first sound production component around the axis of the column, one end of the limiting portion away from the center of the first sound production component is in contact with the inner wall surface of the shell, and the outer wall surface of the first sound production component, the inner wall surface of the shell and the adjacent two limiting portions form the avoiding space.

[0026] In one specific embodiment of the present application, the pushing member is annular, the pushing member has a connecting portion on the inner hole wall of the pushing member, the pushing member is sleeved on the outer periphery of the column, and the connecting portion is detachably connected with the column.

[0027] In one specific embodiment of the present application, the plunger further comprises a limiting block, the limiting block is connected to the column, and the limiting block is located on the end of the column away from the needle cylinder in the first direction.

[0028] In the first direction, the elastic member is arranged on the side of the limiting block away from the needle cylinder, one end of the elastic member is connected with the column through the limiting block in the first direction, and the other end is connected with the shell.

[0029] In one specific embodiment of the present application, the elastic member is a spring, and the elastic member is sleeved on the outer periphery of the column.

[0030] The number of the limiting blocks is a plurality, and the plurality of limiting blocks are arranged around the column, and the accommodating space is formed between the adjacent two limiting blocks.

[0031] The number of the first sound production components is at least two, and all the first sound production components are arranged around the column and uniformly arranged in different accommodating spaces.

[0032] The outer wall surface of the column is provided with a clamping groove.

[0033] The pushing member is annular, and the pushing member is sleeved on the outer periphery of the column body;

[0034] The number of the second sound generating components is at least two, all the second sound generating components are arranged at intervals around the center of the pushing member, and one of the second sound generating components corresponds to one of the first sound generating components, in the second sound generating component, the connecting column is arranged on the inner edge of the pushing member, the buckle body is detachably clamped in the clamping groove, and the pushing member is detachably connected to the column body through the second sound generating component.

[0035] Compared with the prior art, the automatic injection pen has the beneficial effects that:

[0036] In actual application, the automatic injection pen drives the plunger to move along the first direction to the side where the needle cylinder is located by the driving assembly, so as to push the medicament in the needle cylinder out, and since the first sound generating component is arranged on the plunger and located outside the needle cylinder, the second sound generating component is arranged in the shell and located between the first sound generating component and the needle cylinder in the first direction, that is, the second sound generating component is arranged on the travel path of the plunger, and the first sound generating component is coupled with the second sound generating component to emit a sound prompt, so that the patient can clearly know the injection progress when the plunger travels to the preset position. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a front view of the automatic injection pen of the embodiment of the present application;

[0038] Figure 2 is an exploded schematic view of the automatic injection pen of the embodiment of the present application;

[0039] Figure 3 is a perspective view of the cooperation of the plunger, the first sound generating component and the shell of the embodiment of the present application;

[0040] Figure 4 is a perspective view of the cooperation of the plunger, the first sound generating component and the second sound generating component of the embodiment of the present application;

[0041] Figure 5 is a front view of the coupling state of the first sound generating component and the second sound generating component of the embodiment of the present application;

[0042] Figure 6 is another perspective view of the cooperation of the plunger, the first sound generating component and the second sound generating component of the embodiment of the present application;

[0043] Figure 7 is a schematic view of the needle cylinder in the first preset position of the embodiment of the present application;

[0044] Figure 8 FIG. 9 is a schematic view of the syringe in the second preset position according to an embodiment of the present application.

[0045] In the figure, X, first direction; 1, shell; 2, syringe; 3, plunger; 31, column body; 3101, clamping groove; 3102, third limiting groove; 32, pusher; 321, connecting part; 33, limiting block; 3301, second limiting groove; 4, driving assembly; 41, locking member; 42, elastic member; 5, first sound emitting component; 501, guide slope; 502, first limiting groove; 51, limiting part; 6, second sound emitting component; 61, connecting column; 62, buckle body; 100, avoiding space; 200, containing space. DETAILED DESCRIPTION

[0046] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0047] As shown in Figures 1 to 8 An automatic injection pen according to an embodiment of the present application includes a shell 1, a syringe 2, a plunger 3, a driving assembly 4, a first sound emitting component 5 and a second sound emitting component 6. The shell 1 has a first direction X. The syringe 2 is connected to the shell 1 and can move along the first direction X. The plunger 3 is arranged in the shell 1 and has the same length direction as the first direction X. The plunger 3 and the syringe 2 are arranged along the first direction X, and the plunger 3 at least partially extends into the syringe 2 and can move along the first direction X. The driving assembly 4 is connected to the shell 1 and is used to drive the plunger 3 to move along the first direction X towards the side where the syringe 2 is located, so as to push the medicament in the syringe 2 out. The first sound emitting component 5 is connected to the plunger 3 and is located outside the syringe 2. The second sound emitting component 6 is arranged in the shell 1 and is located between the first sound emitting component 5 and the syringe 2 along the first direction X. The second sound emitting component 6 is used to couple with the first sound emitting component 5 to emit sound prompt.

[0048] In actual application, the plunger 3 is driven by the driving assembly 4 to move along the first direction X towards the side where the needle cylinder 2 is located, so as to push the medicine in the needle cylinder 2 out. Since the first sound emitting component 5 is arranged on the plunger 3 and is located outside the needle cylinder 2, the second sound emitting component 6 is arranged in the housing 1 and is located between the first sound emitting component 5 and the needle cylinder 2 along the first direction X, i.e. the second sound emitting component 6 is arranged on the travel path of the plunger 3, and the first sound emitting component 5 is arranged to be coupled with the second sound emitting component 6 to emit a sound prompt. Therefore, when the plunger 3 travels to the preset position, the first sound emitting component 5 is coupled with the second sound emitting component 6 to emit a sound prompt, so that the patient can clearly know the injection progress. For example, the first sound emitting component 5 is coupled with the second sound emitting component 6 to emit a sound prompt after the plunger 3 pushes the medicine in the needle cylinder 2 out, at this time, the prompt indicates that the automatic injection pen has completed the injection. In other embodiments, the first sound emitting component 5 can be coupled with the second sound emitting component 6 within a preset time before the injection is completed, or the two are coupled in the middle of the injection, which plays a role in prompting the corresponding injection progress. Specifically, the coupling time of the first sound emitting component 5 and the second sound emitting component 6 is determined by the distance between the two, which is set according to actual application, and the present application does not limit this.

[0049] In the present application, the housing 1 is in a cylindrical shape, which is simple in structure and convenient for the operator to hold and operate.

[0050] In the present embodiment, as shown in Figure 4 , the plunger 3 comprises a plunger body 31 and a pushing member 32. The length direction of the plunger body 31 is the same as the first direction X, and the plunger body 31 is arranged in the housing 1 and at least partially extends into the needle cylinder 2. The pushing member 32 is detachably connected to the plunger body 31 and is located outside the needle cylinder 2. The first sound emitting component 5 is connected to the outer circumferential surface of the plunger body 31, and the second sound emitting component 6 is connected to the pushing member 32. The driving assembly 4 is used to drive the plunger body 31 to move along the first direction X, and the pushing member 32 is used to push the needle cylinder 2 to move along the first direction X from the first preset position to the second preset position under the action of the driving assembly 4. When the needle cylinder 2 is located at the second preset position, the needle cylinder 2 is fixedly arranged, the pushing member 32 is separated from the plunger body 31, the plunger body 31 continues to move under the action of the driving assembly 4 to push the medicine in the needle cylinder 2 out, and the pushing member 32 stays at the position in contact with the needle cylinder 2. When the plunger body 31 continues to travel to the preset position, the first sound emitting component 5 is coupled with the second sound emitting component 6 to emit a sound prompt. Specifically, as shown in Figure 7 , when the needle cylinder 2 is at the first preset position, the needle cylinder 2 is completely located in the housing 1, at this time, the needle of the needle cylinder 2 will not be exposed outside the housing 1, and the automatic injection pen will not be mistakenly used when it is idle, thereby improving the safety of the automatic injection pen when it is not in use. When the needle cylinder 2 is at the second preset position, as shown in Figure 8As shown, the needle is exposed outside the shell 1, wherein the fixed arrangement of the needle cylinder 2 can be achieved by arranging a limiting boss on the inner wall of the shell 1, and the automatic injection pen further comprises a protective sleeve, such as Figure 7 As shown, the protective sleeve is slidingly arranged in the shell 1, and a spring is connected between the protective sleeve and the shell 1, in actual application, when the protective sleeve contacts the skin and continuously receives pressure towards the skin, the protective sleeve will be retracted into the shell 1, thereby enabling the needle to smoothly penetrate into the skin, so as to ensure the smooth progress of the injection process.

[0051] As shown, Figure 2 The driving assembly 4 comprises a locking member 41 and an elastic member 42, the locking member 41 is connected to the shell 1, in the first direction X, the locking member 41 is detachably connected to the end of the column 31 away from the needle cylinder 2, the elastic member 42 is arranged in the shell 1, and the elastic member 42 connects the shell 1 and the column 31, and the elastic member 42 is used to drive the column 31 to move in the first direction X after the locking member 41 is separated from the column 31; specifically, the locking member 41 comprises a button and a locking claw, the locking claw buckles the column 31, and pressing the button can make the locking claw release the column 31, and when the locking claw buckles the column 31, the shell 1 and the column 31 compress the elastic member 42 in the first direction X, thereby, after the locking claw releases the column 31, the elastic member 42 elastically recovers, and the elastic member 42 drives the column 31 to move in the first direction X.

[0052] As shown, Figure 3 and Figure 4As shown, the first sound generating component 5 has a guide slope surface 501, one side of the first sound generating component 5 facing away from the column 31 and one side of the first sound generating component 5 facing the needle cylinder 2 are connected through the guide slope surface 501, the guide slope surface 501 extends obliquely from outside to inside along the first direction X, and a clearance space 100 is formed between the one side of the first sound generating component 5 facing away from the column 31 and the inner wall surface of the shell 1; the second sound generating component 6 comprises a connecting column 61 and a buckle 62, the length direction of the connecting column 61 is the same as the first direction X, one end of the connecting column 61 is connected to the one side of the pusher 32 facing away from the needle cylinder 2 and the other end of the connecting column 61 is connected to the buckle 62 along the first direction X; wherein, in the first direction X, the buckle 62 at least partially faces the guide slope surface 501, and in the radial direction of the column 31, the one side of the connecting column 61 facing away from the column 31 has a preset distance from the inner wall surface of the shell 1, the connecting column 61 can be deformed towards the side where the inner wall surface of the shell 1 is located under the action of the first sound generating component 5, and the clearance space 100 is used for the connecting column 61 to pass through; specifically, the first sound generating component 5 and the second sound generating component 6 are both made of plastic, after the pusher 32 is separated from the column 31, the column 31 continues to move to the preset position, the buckle 62 first contacts the guide slope surface 501 and then moves along the guide slope surface 501, in this process, the connecting column 61 is deformed and bent towards the side where the inner wall surface of the shell 1 is located, and when the buckle 62 passes the first sound generating component 5, at this time, the structure diagram of the cooperation between the first sound generating component 5 and the second sound generating component 6 is as shown in Figure 5 As shown, since the buckle 62 is no longer under stress, the connecting column 61 will be elastically reset, in this process, the connecting column 61 will emit a prompt sound, this structure realizes the emission of the prompt sound, can fully utilize the space between the plunger 3 and the inner wall surface of the shell 1, has compact structure and relatively simple structure of the automatic injection pen, and is convenient for processing; the pusher 32 plays a role of pushing the needle cylinder 2 to move, cooperates with the second sound generating component 6 to play a role of emitting a prompt sound, and the pusher 32 is separably connected to the column 31, therefore, the pusher 32 can be machined to simultaneously form the second sound generating component 6, has simple structure and is convenient for processing, and when the pusher 32 is assembled on the column 31, the second sound generating component 6 can also be directly assembled in the shell 1, and the assembly operation is simple.

[0053] In other implementations, the second sound generating component 6 can be connected to the shell 1, which is not limited in the application.

[0054] In the embodiment, as shown in Figure 2As shown in the figure, in the first direction X, the elastic member 42 is arranged on the side of the first sound generating component 5 away from the second sound generating component 6, one end of the elastic member 42 is connected with the column 31 through the first sound generating component 5 in the first direction X, and the other end is connected with the shell 1, at this time, the first sound generating component 5 plays a role of emitting prompt sound and connecting the elastic member 42, which makes the automatic injection pen not need to additionally set a connecting structure to connect the elastic member 42 with the column 31, and the automatic injection pen has the characteristics of compact structure.

[0055] As shown in the figure, Figure 2 and Figure 4 the elastic member 42 is a spring, and the elastic member 42 is sleeved on the outer periphery of the column 31, the spring is used as the elastic member 42 for driving the column 31 to move, which has the characteristics of simple structure, convenient installation and balanced driving force; and the first sound generating component 5 is annular, and the first sound generating component 5 is arranged around the axis of the column 31, thereby being able to stably support the spring, so that the column 31 can stably move in the first direction X under the driving of the elastic member 42, preferably, the inner surface of the first sound generating component 5 away from the pusher 32 is concave to form a first limiting groove 502, and the spring is inserted into the first limiting groove 502, which can make the connection of the spring and the first sound generating component 5 more stable; at this time, in the radial direction of the column 31, the connecting column 61 is arranged on the end of the pusher 32 away from the column 31, thereby ensuring that the first sound generating component 5 and the second sound generating component 6 can be coupled smoothly.

[0056] Further, as shown in the figure, Figure 3 and Figure 4 the first sound generating component 5 has a plurality of limiting portions 51, the plurality of limiting portions 51 are arranged on the outer wall surface of the first sound generating component 5 around the axis of the column 31, one end of the limiting portion 51 away from the center of the first sound generating component 5 is in contact with the inner wall surface of the shell 1, and the outer wall surface of the first sound generating component 5, the inner wall surface of the shell 1 and the adjacent two limiting portions 51 form an avoiding space 100, based on the arrangement of the limiting portion 51, the first sound generating component 5 can always be in contact with the inner wall surface of the shell 1, thereby avoiding the column 31 deviating from the central axis of the automatic injection pen, so that the column 31 can smoothly extrude the liquid medicine in the needle cylinder 2.

[0057] As shown in the figure, Figure 4As shown, the pushing member 32 is annular, and has a connecting portion 321 on the inner hole wall of the pushing member 32, the pushing member 32 is sleeved on the outer periphery of the column body 31, and the connecting portion 321 is detachably connected with the column body 31. The connecting portion 321 can be a clamping block, and the column body 31 is provided with a clamping groove, the clamping block is detachably clamped in the clamping groove, the clamping block can be separated from the clamping groove when the pushing member 32 is stressed, and the pushing member 32 is detachably connected with the column body 31 in this way, which is simple and reliable in structure and convenient to process. In other embodiments, the connecting portion 321 can be a weak part, which can be broken when stressed, and the detachable connection between the pushing member 32 and the column body 31 can also be achieved based on this.

[0058] In the present application, another implementation manner of the plunger 3 is as shown in Figure 6 As shown, the plunger 3 further comprises a limiting block 33 connected to the column body 31, and the limiting block 33 is located on the end of the column body 31 away from the needle cylinder 2 in the first direction X. In the first direction X, the elastic member 42 is arranged on the side of the limiting block 33 away from the needle cylinder 2, one end of the elastic member 42 is connected with the column body 31 through the limiting block 33 in the first direction X, and the other end is connected with the shell 1. At this time, the first sound producing component 5 does not play a role in connecting the elastic member 42, and thus the column body 31 is connected with the elastic member 42.

[0059] Similarly, the elastic member 42 is also a spring, the elastic member 42 is sleeved on the outer periphery of the column body 31; based on this, the number of the limiting blocks 33 is multiple, the multiple limiting blocks 33 are arranged at intervals around the column body 31 to stably support the spring, and a containing space 200 is formed between adjacent two limiting blocks 33, the number of the first sound generating components 5 is at least two, all the first sound generating components 5 are arranged at intervals around the column body 31 and are uniformly arranged in different containing spaces 200, that is, the first sound generating components 5 and the limiting blocks 33 are arranged in the circumferential direction around the column body 31, and the occupied space of both in the first direction X is relatively small, and the structure is compact; the outer wall surface of the column body 31 is provided with a clamping groove 3101; the pushing member 32 is annular, and the pushing member 32 is sleeved on the outer periphery of the column body 31; the number of the second sound generating components 6 is at least two, all the second sound generating components 6 are arranged at intervals around the center of the pushing member 32, and one second sound generating component 6 corresponds to one first sound generating component 5, among the second sound generating components 6, the connecting column 61 is arranged on the inner edge of the pushing member 32, the buckle body 62 is detachably clamped in the clamping groove 3101, and the pushing member 32 is detachably connected to the column body 31 through the second sound generating component 6, at this time, the second sound generating component 6 plays a role of cooperating with the first sound generating component 5 to emit a prompt sound, and also plays a role of making the pushing member 32 detachably connected to the column body 31, which can make the structure of the pushing member 32 more simplified and convenient for production; in addition, since the second sound generating component 6 is arranged on the inner edge of the pushing member 32, and the distance between the inner edge of the pushing member 32 and the inner wall surface of the shell 1 is relatively large, thereby, the cross-sectional area of the connecting column 61 perpendicular to the first direction X can be increased to improve the rigidity of the connecting column 61, so that the impact force of the connecting column 61 on the first sound generating component 5 during the resetting process after the coupling of the second sound generating component 6 with the first sound generating component 5 will be larger, and the connecting column 61 will not slow down the impact force, thereby, the prompt sound emitted by the second sound generating component 6 after coupling with the first sound generating component 5 will be larger, and the prompt effect is obvious.

[0060] Preferably, the side of each limiting block 33 away from the pushing member 32 is concave to form a second limiting groove 3301, and the spring is inserted into the second limiting groove 3301, which can make the arrangement of the spring more stable.

[0061] Further, as Figure 6As shown, the column 31 is provided with a third limiting groove 3102 extending along the first direction X, the first sound production component 5 is arranged in the third limiting groove 3102, and the clamping groove 3101 is also arranged in the third limiting groove 3102, at this time, the buckle body 62 of the second sound production component 6 is inserted into the third limiting groove 3102, the third limiting groove 3102 can guide the second sound production component 6 to move along the first direction X relative to the column 31, thereby enabling the first sound production component 5 and the second sound production component 6 to be coupled to smoothly emit the prompt sound; wherein one first sound production component 5, one second sound production component 6 and one third limiting groove 3102 are matched, the number of the third limiting groove 3102 is set according to the number of the first sound production component 5 and the second sound production component 6, and the present application does not make too much redundancy.

[0062] In the present application, the shell 1 is also provided with a window opposite to the needle cylinder 2, so that the user can observe whether the medicament in the needle cylinder 2 is injected through the window, and the use of the automatic injection pen can be more convenient.

[0063] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and replacements can also be made, which should be considered as the protection scope of the present application.

Claims

1. An automatic injection pen, characterized in that, It includes a housing (1), a syringe (2), a plunger (3), a drive assembly (4), a first sound-generating component (5), and a second sound-generating component (6); The housing (1) has a first orientation (X); The syringe (2) is connected inside the housing (1), and the syringe (2) is movable along the first direction (X); The plunger (3) is disposed inside the housing (1). The length direction of the plunger (3) is the same as the first direction (X). The plunger (3) and the syringe (2) are arranged along the first direction (X). The plunger (3) extends at least partially into the syringe (2). The plunger (3) is capable of moving along the first direction (X). The drive assembly (4) is connected to the housing (1) and is used to drive the plunger (3) to move along the first direction (X) toward the side where the syringe (2) is located, so as to push out the medicine in the syringe (2); The first sound-generating component (5) is connected to the plunger (3), the plunger (3) includes a column (31) and a pusher (32), the first sound-generating component (5) is connected to the outer peripheral surface of the column (31), and the first sound-generating component (5) is located outside the syringe (2), and the side of the first sound-generating component (5) facing away from the column (31) forms a clearance space (100) with the inner wall surface of the housing (1). The second sound-emitting component (6) is disposed inside the housing (1) and connected to the pusher (32). In the first direction (X), the second sound-emitting component (6) is located between the first sound-emitting component (5) and the syringe (2). The second sound-generating component (6) includes a connecting post (61) and a buckle (62). The length direction of the connecting post (61) is the same as that of the first direction (X). One end of the connecting post (61) along the first direction (X) is connected to the side of the pusher (32) facing away from the syringe (2), and the other end is connected to the buckle (62). The second sound-emitting component (6) is used to couple with the first sound-emitting component (5) to emit a sound prompt; The clearance space (100) is used for the connecting post (61) to pass through. The connecting post (61) can deform toward the side of the inner wall of the housing (1) under the action of the first sound-emitting component (5). After the buckle (62) passes the first sound-emitting component (5), the connecting post (61) will elastically reset. During this process, the connecting post (61) will emit a prompt sound.

2. The automatic injection pen according to claim 1, characterized in that, The length direction of the column (31) is the same as the first direction (X), the column (31) is disposed inside the housing (1), and the column (31) extends at least partially into the syringe (2); The pusher (32) is detachably connected to the column (31), and the pusher (32) is located outside the syringe (2); The driving component (4) is used to drive the column (31) to move along the first direction (X), and the pusher (32) is used to push the syringe (2) to move along the first direction (X) from a first preset position to a second preset position under the action of the driving component (4). When the syringe (2) is located at the second preset position, the syringe (2) is fixedly set, the pusher (32) is separated from the column (31), and the column (31) continues to move under the action of the driving component (4) to push out the medicine in the syringe (2).

3. The automatic injection pen according to claim 2, characterized in that, The drive assembly (4) includes a locking member (41) and an elastic member (42). The locking member (41) is connected to the housing (1). In the first direction (X), the locking member (41) is detachably connected to the end of the column (31) away from the syringe (2). The elastic member (42) is disposed inside the housing (1) and connects the housing (1) and the column (31). The elastic member (42) is used to drive the column (31) to move along the first direction (X) after the locking member (41) is separated from the column (31).

4. The automatic injection pen according to claim 3, characterized in that, The first sound-generating component (5) has a guide slope (501). The side of the first sound-generating component (5) facing away from the column (31) and the side of the first sound-generating component (5) facing the syringe (2) are connected by the guide slope (501). The guide slope (501) extends obliquely from the outside to the inside along the first direction (X). In the first direction (X), the buckle (62) is at least partially opposite to the guide slope (501), and in the radial direction of the column (31), the side of the connecting column (61) facing away from the column (31) has a predetermined distance from the inner wall of the shell (1).

5. The automatic injection pen according to claim 4, characterized in that, In the first direction (X), the elastic element (42) is located on the side of the first sound-producing component (5) away from the second sound-producing component (6). One end of the elastic element (42) along the first direction (X) is connected to the column (31) through the first sound-producing component (5), and the other end is connected to the housing (1).

6. The automatic injection pen according to claim 5, characterized in that, The elastic element (42) is a spring, and the elastic element (42) is sleeved on the outer periphery of the column (31); The first sound-emitting component (5) is ring-shaped and is arranged around the axis of the column (31); In the radial direction of the column (31), the connecting column (61) is located at the end of the pusher (32) away from the column (31).

7. The automatic injection pen according to claim 6, characterized in that, The first sound-generating component (5) has a plurality of limiting parts (51), and the plurality of limiting parts (51) are arranged at intervals around the axis of the column (31) on the outer wall surface of the first sound-generating component (5). The end of the limiting part (51) away from the center of the first sound-generating component (5) contacts the inner wall surface of the housing (1). The clearance space (100) is formed between the outer wall surface of the first sound-generating component (5), the inner wall surface of the housing (1), and two adjacent limiting parts (51).

8. The automatic injection pen according to claim 6, characterized in that, The pusher (32) is annular and has a connecting part (321). The connecting part (321) is located on the inner wall of the pusher (32). The pusher (32) is sleeved on the outer periphery of the column (31). The connecting part (321) is detachably connected to the column (31).

9. The automatic injection pen according to claim 4, characterized in that, The plunger (3) further includes a limiting block (33), which is connected to the column (31) and is located on the end of the column (31) away from the syringe (2) in the first direction (X). In the first direction (X), the elastic element (42) is located on the side of the limiting block (33) away from the syringe (2). One end of the elastic element (42) along the first direction (X) is connected to the column (31) through the limiting block (33), and the other end is connected to the housing (1).

10. The automatic injection pen according to claim 9, characterized in that, The elastic element (42) is a spring, and the elastic element (42) is sleeved on the outer periphery of the column (31); The number of the limiting blocks (33) is multiple, and the multiple limiting blocks (33) are arranged at intervals around the column (31), and an accommodating space (200) is formed between two adjacent limiting blocks (33). The number of the first sound-emitting components (5) is at least two, and all the first sound-emitting components (5) are arranged at intervals around the column (31) and evenly distributed in different accommodating spaces (200); The outer wall surface of the column (31) is provided with a snap-fit ​​groove (3101); The pusher (32) is annular and is sleeved on the outer periphery of the column (31); The number of the second sound-emitting components (6) is at least two. All the second sound-emitting components (6) are arranged at intervals around the center of the pusher (32), and one second sound-emitting component (6) corresponds to one first sound-emitting component (5). In the second sound-emitting component (6), the connecting post (61) is provided on the inner edge of the pusher (32), the buckle (62) is detachably snapped into the snap-fit ​​groove (3101), and the pusher (32) is detachably connected to the post (31) through the second sound-emitting component (6).

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