CN110400509B

CN110400509B - Injection training device with sound prompt function

Info

Publication number: CN110400509B
Application number: CN201910697070.XA
Authority: CN
Inventors: 侯士双; 袁霞林; 胡高扬; 陈常娇
Original assignee: Ningbo Ruiai Product Design Co ltd
Current assignee: Ningbo Ruiai Product Design Co ltd
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2021-04-13
Anticipated expiration: 2039-07-30
Also published as: CN110400509A

Abstract

The invention relates to an injection training device with an audio prompt function, which comprises a shell with a first end and a second end; the inner sleeve is fixedly arranged in the shell and extends along the axial direction of the shell, a flange and at least two sections of sliding rails are arranged on the inner sleeve, and ribs extending along the axial direction of the shell are formed at the starting end of each sliding rail; the rotating sleeve is movably sleeved on the inner sleeve, a pushing part is arranged on the outer wall of the rotating sleeve, a sliding part capable of moving along the sliding rail is arranged on the inner wall of the rotating sleeve, and the sliding part abuts against the rib and is positioned on the opposite side of the sliding rail in an initial state; the protective sleeve at least partially can extend out of the shell, and a pushing part matched with the inclined plane of the pushing part is arranged on the protective sleeve; the first elastic piece acts on the rotating sleeve to keep the rotating sleeve moving towards the first end of the shell; the second resilient member acts on the protective cover to maintain the protective cover in a tendency to extend out of the housing. The device has simple structure, can make sound and does not need artificial reset.

Description

Injection training device with sound prompt function

Technical Field

The invention belongs to the technical field of medical appliances, and particularly relates to an injection training device with a voice prompt function.

Background

The most common way of administering drugs is by injection, e.g. intravenous, subcutaneous or intramuscular injection, where syringes containing the drug are used for injection, which is usually performed by trained medical personnel. In some cases, where it is desirable to inject drugs on a regular basis, it is desirable for a patient or other individual to use a syringe to self-inject or to inject other individuals, and devices for automatic injection have been developed to allow the patient to self-inject.

However, since the patient is usually neither a nurse nor a person educated in the medical device setting, such a device for automatic injection must prove to be simple and safe to use. In particular, it is important to ensure that controlled doses of product are injected with such a device, that is, a complete injection must be made. It is therefore important for the user to be informed that the product has started injection, that the injection has been substantially completed and that the user can pull the device from the injection site.

As shown in the "injection practice device" disclosed in chinese patent application No. ZL201580003760.0 (publication No. CN105900162A), which allows a user to simulate an injection procedure using a real-life commercial automatic injector containing a pre-filled medicament container. The exercise device is resettable, thus allowing the user to perform multiple simulations.

The injection practice device suffers from the following drawbacks: 1. manual reset through a mandrel is needed, and the operation is complicated; 2. the sound effect is produced by one or more flexible arms that move with the plunger assembly relative to an axially fixed sound emitting track. As the simulated injection procedure progresses, the flexible arm bounces on a row of longitudinal teeth producing an audible "click" sound, wherein each "click" sound preferably represents the ejection of a unit dose of the simulated medicament, which sound structure involves many parts, is complex and has a high failure rate.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides an injection training device with a voice prompt function, which has fewer parts, has the voice prompt function and does not need manual reset.

The technical scheme adopted by the invention for solving the technical problems is as follows: an injection training device with sound prompt function comprises

A housing having a hollow interior, the housing having a first end and a second end along an axial direction thereof;

it is characterized by also comprising

The inner sleeve is fixedly arranged in the shell and extends along the axial direction of the shell, at least two sections of sliding rails which are arranged at intervals along the circumferential direction of the inner sleeve are sequentially formed on the outer wall of the inner sleeve, the flanges extend along the circumferential direction of the inner sleeve, the sliding rails are obliquely arranged, a distance is reserved between the sliding rails and the flanges, ribs which extend along the axial direction of the shell are formed at the starting ends of the sliding rails, and the middle parts of the ribs are connected with the sliding rails;

the rotating sleeve is arranged in the shell, movably sleeved on the inner sleeve, a pushing part is arranged on the outer wall of the rotating sleeve, a sliding part capable of producing audible sound when impacting on the starting end and the flange of the sliding rail is arranged on the inner wall of the rotating sleeve, the sliding part can move along the sliding rail, and in an initial state, the sliding part is abutted against the rib and is positioned on the opposite side of the sliding rail;

the protective sleeve is arranged at the first end of the shell in a sliding manner, at least part of the protective sleeve can extend out of the shell, a pushing part capable of pushing the pushing part to move towards the second end of the shell is arranged on the protective sleeve, and the pushing part is matched with the contacted joint surface inclined plane of the pushing part;

the first elastic piece acts on the rotating sleeve to keep the rotating sleeve in a trend of moving towards the first end of the shell;

and the second elastic piece acts on the protective sleeve to ensure that the protective sleeve keeps the trend of extending out of the shell.

In order to make the good cooperation of rotating cover and protective sheath in order to realize the function, push against the portion and be the rib form along casing axial extension, one of them side of pushing against the portion is first face, and the terminal surface that pushes against the portion towards the first end of casing is the second face, the terminal surface that the promotion portion of protective sheath was towards the first end of casing is the third face, and the terminal surface that the promotion portion was towards the second end of casing is the fourth face, and wherein first face and the cooperation of third face inclined plane make the protective sheath reset to initial condition, and the cooperation of second face and fourth face inclined plane makes the rotation sheathe in and shifts and rotate.

In order to avoid the rotation of the protective sleeve in the resetting process, the protective sleeve comprises a sleeve and a first support arm formed at the top of the sleeve, the first support arm extends along the axial direction of the shell, and the pushing part is formed at the head part of the first support arm. Because of the cooperation of first face and third face inclined plane, the protective sheath can take place to rotate at the in-process that resets, but will promote the portion setting and can solve this problem on the first support arm for the cantilever state, because of at the protective sheath in-process that moves down, first support arm can the certain angle of lateral swing to avoid interfering with the portion of promoting.

In order to further prevent that the sleeve from rotating at the in-process that resets, telescopic top still shaping has along the second support arm of casing axial extension, be equipped with the mount in the casing, set up the spout with second support arm sliding fit along its axial on the mount, the cooperation of second support arm and spout is spacing to the removal orbit of protective sheath.

In order to carry on spacingly to the stroke that resets of protective sheath, the protective sheath is at least local the cover is located on the endotheca, just be equipped with the first spacing portion and the spacing portion of second of the removal stroke of restriction protective sheath towards casing second end between protective sheath and the endotheca, the cooperation is supported in the card of the spacing portion of first spacing portion and second, prevents that the protective sheath from removing excessively, guarantees that the protective sheath resets to initial position.

In order to prevent the sliding part from moving to the tail end of the sliding rail, the sliding part moves downwards to hit the flange and generate offset in the process, guide strips which are consistent with the sliding rail in quantity and extend along the axial direction of the shell are further arranged on the outer wall of the inner sleeve, two ends of each guide strip are respectively connected with the tail end of the sliding rail and the flange, and the spaces between the guide strips and the adjacent ribs are matched with the width of the sliding part so as to guide the moving track of the sliding part.

In order to prevent the injection speed from being too fast, a rotating shaft extending towards the second end of the shell is formed on the rotating sleeve in a molding mode, the rotating shaft is rotatably inserted into a fixing sleeve fixedly arranged relative to the shell, a mounting groove is formed in the end face of the fixing sleeve towards the second end of the shell, damping media and a damping piece capable of rotating relative to the mounting groove are contained in the mounting groove, and the rotating shaft can be connected with the damping piece in an axial sliding mode. The damping medium and the damping member play a time-delay role.

In order to improve the time delay effect of damping piece and damping medium, the mounting groove has at least two and sets up along the radial interval of fixed cover, each the mounting groove extends along fixed cover circumference, correspondingly, the damping piece is the column and has the portion of inserting that can correspond to locate in the mounting groove.

In order to prevent the rotation of the rotating sleeve, the first elastic part is also driven and is partially twisted, a sliding disc capable of moving along with the rotating shaft is further sleeved on the rotating shaft, the sliding disc and the fixing sleeve are arranged at intervals, and the first elastic part is a spring, and two ends of the first elastic part are respectively abutted against the sliding disc and the fixing sleeve.

Compared with the prior art, the invention has the advantages that: the sliding part of the injection training device of the invention makes a sound when impacting the initial end of the sliding rail (injection is started), then the sliding part moves along the sliding rail (injection process), and the impact flange quickly moves to make a sound when the sliding part moves to the tail end of the sliding rail (injection is finished), so that not only can injection be finished, but also the sound can be made when the injection is started and finished through few parts with simple structures, so as to prompt a user and improve the use safety and convenience; in addition, after the injection is completed, each part can be automatically reset to be used next time, manual reset is not needed, and the operation is convenient and fast.

Drawings

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

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is an exploded view of portion A of FIG. 2;

FIG. 4 is a schematic view of the damper of FIG. 3;

FIG. 5 is a schematic view of the structure of FIG. 4 in another direction;

FIG. 6 is a schematic view of the rotating sleeve of FIG. 3;

FIG. 7 is a schematic view of the structure of FIG. 6 in another direction;

FIG. 8 is a schematic structural view of the inner sleeve of FIG. 3;

FIG. 9 is a schematic view of the protective sheath of FIG. 3;

FIG. 10 is a schematic view of the structure of FIG. 9 in another direction;

FIG. 11 is a schematic structural view of the fixing frame in FIG. 3;

FIG. 12 is a schematic cross-sectional view of FIG. 1 (initial state);

FIG. 13 is a schematic view of the structure of FIG. 1 with the housing removed (initial state);

FIG. 14 is a schematic view of the structure of FIG. 13 with the fixture removed (initial state);

FIG. 15 is a schematic structural view of the fixing frame of FIG. 1 with the housing removed (the rotating sleeve is pushed upwards by the protecting sleeve);

FIG. 16 is a schematic structural view of the fixing frame of FIG. 1 with the housing removed (the rotating sleeve is pushed by the protecting sleeve to rotate);

FIG. 17 is a schematic structural view of the stationary frame of FIG. 1 with the housing removed (the rotating sleeve hits the inner sleeve to generate a first sound);

FIG. 18 is a schematic view of the housing-removed, stationary frame of FIG. 1 (injection process);

fig. 19 is a schematic structural view of the fixed frame of fig. 1 with the housing removed (the rotating sleeve hits the inner sleeve to emit a second sound).

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 19, the injection training device with sound prompt function of the preferred embodiment includes a hollow housing 1, the housing 1 has a first end 1a and a second end 1b along an axial direction thereof, the first end 1a of the housing 1 is open, a cap 12 is detachably covered at the first end 1a, an axially extending connection column 121 is disposed on the cap 12, the connection column 121 is inserted and connected with an inner sleeve 2, and the connection column 121 is used for enabling the cap 12 to be pulled out with a force to simulate the pulling out of the cap 12 of a real injector. In this embodiment, the first end 1a of the housing 1 is set to be downward, and the second end 1b of the housing 1 is set to be upward.

The shell 1 is internally provided with a fixed frame 7, an inner sleeve 2, a rotating sleeve 3, a protective sleeve 4, a sliding disk 34, a first elastic element 5 and a second elastic element 6.

In this embodiment, as shown in fig. 2 and 3, an outwardly protruding elastic buckling leg 74 is disposed on a side wall of the fixing frame 7, a buckling hole 11 for buckling the buckling leg 74 therein is disposed on a side wall of the casing 1, and the fixing frame 7 and the casing 1 are assembled together by buckling the buckling leg 74 and the buckling hole 11. Of course, other detachable structures can be adopted to assemble the fixing frame 7 and the shell 1 into a whole.

The inner sleeve 2 extends axially along the housing 1 and is located at the lower part of the fixed frame 7, the inner sleeve 2 is partially inserted into the fixed frame 7, as shown in fig. 3 and 13, a projection 20 is arranged on the outer wall of the middle part of the inner sleeve 2, the projection 20 is inserted into a slot 76 on the lower side wall of the fixed frame 7, and the inner sleeve 2 is fixed in the housing 1 through the fixed frame 7 by the cooperation of the projection 20 and the slot 76.

As shown in fig. 3 and 8, a flange 21 extending along the circumferential direction of the inner sleeve 2 and at least two sections of slide rails 22 arranged at intervals along the circumferential direction of the inner sleeve 2 are sequentially formed on the outer wall of the inner sleeve 2 from the first end 1a to the second end 1b of the housing 1, each slide rail 22 is arranged obliquely and has a distance from the flange 21, in this embodiment, when looking down on fig. 8, the slide rail 22 is inclined from the second end 1b of the housing 1 to the first end 1a of the housing 1 along the clockwise direction of the inner sleeve 2, and the slide rail 22 is preferably spirally arranged clockwise from top to bottom. The starting end of each slide rail 22 is formed with a rib 23 extending along the axial direction of the housing 1, the middle part of the rib 23 is connected with the starting end of the slide rail 22, the tail end of each slide rail 22 is formed with a guide strip 24 extending along the axial direction of the housing 1 to the first end 1a side of the housing, and the guide strip 24 is connected with the flange 21.

As shown in fig. 12 and 14, the rotating sleeve 3 is movably sleeved on the inner sleeve 2 and located in the fixed frame 7, as shown in fig. 6 and 7, a sliding portion 32 capable of generating audible sound when sequentially impacting on the starting end of the sliding rail 22 and the flange 21 is arranged on the inner wall of the rotating sleeve 3, the sliding portion 32 can move along the track of the sliding rail 22, and preferably, the distance between the guide strip 24 and the adjacent rib 23 (i.e. the guide strip 24 and the rib 23 between the adjacent sliding rails 22) is matched with the width of the sliding portion 32, so that the distance guides and limits the moving track of the sliding portion 32. In the initial state shown in fig. 12, 13, and 14, the sliding portion 32 abuts against the rib 23 and is located on the opposite side (i.e., opposite side) of the slide rail 22.

As shown in fig. 6 and 7, the outer wall of the rotating sleeve 3 is provided with a pushing portion 31 extending along the axial direction of the housing 1, the pushing portion 31 is rib-shaped, one side surface of the pushing portion 31 is a first surface 312, an end surface of the pushing portion 31 facing the first end 1a of the housing 1 is a second surface 311, in a top view direction of fig. 6, the second surface 311 of the pushing portion 31 is inclined from the second end 1b of the housing 1 to the first end 1a of the housing 1 in a clockwise direction along the protective sleeve 4, the first surface 312 of the pushing portion 31 is also inclined from the second end 1b of the housing 1 to the first end 1a of the housing 1 in a clockwise direction along the protective sleeve 4, and inclination angles of the first surface 312 and the second surface 311 are different, preferably, the first surface 312 and the second surface 311 of the pushing portion 31 are both arranged spirally from top to bottom in a clockwise direction.

As shown in fig. 12 to 14, the protective sleeve 4 is slidably disposed at the port of the first end 1a of the housing 1, and in an initial state, the protective sleeve 4 at least partially extends out of the housing 1. In the embodiment shown in fig. 9 and 10, the protective sleeve 4 includes a sleeve 40 and a first arm 42 and a second arm 44 formed at the top of the sleeve 40 at intervals, and the first arm 42 and the second arm 44 both extend axially along the housing 1.

The head of the first arm 42 is formed with a pushing part 41, the pushing part 41 can push the pushing part 31 on the rotating sleeve 3 to move toward the second end 1b of the housing 1, the contacting joint surface of the pushing part 41 and the pushing part 31 is in inclined plane fit, as shown in fig. 9 and 10, in this embodiment, the end surface of the pushing part 41 of the protective sleeve 4 facing the first end 1a of the housing 1 is a third surface 412, the end surface of the pushing part 41 facing the second end 1b of the housing 1 is a fourth surface 411, wherein the first surface 312 is in inclined plane fit with the third surface 412, the second surface 311 is in inclined plane fit with the fourth surface 411, that is, the fourth surface 411 of the pushing part 41 is in the same inclination direction as the second surface 311 of the pushing part 31, and the third surface 412 of the pushing part 41 is in the same inclination direction as the first surface 312 of the pushing part. (in the case that the second surface 311 and the first surface 312 of the pushing part 31 are spirally disposed, the third surface 412 and the fourth surface 411 of the pushing part 41 are also spirally disposed, the fourth surface 411 of the pushing part 41 is identical to the spiral direction of the second surface 311 of the pushing part 31 and is matched with the spiral inclined surface of the second surface 311 of the pushing part 31, and the third surface 412 of the pushing part 41 is identical to the spiral direction of the first surface 312 of the pushing part 31 and is matched with the spiral inclined surface of the first surface 312 of the pushing part.)

Since the first arm 42 is in a cantilever state, when the third surface 412 of the pushing portion 41 moves along the first surface 312 of the pushing portion 31, the first arm 42 can swing laterally by a certain angle to avoid interference with the pushing portion 31 and prevent the protection cover 4 from moving downward, in which case the material of the protection cover 4 needs to enable the first arm 42 to swing by a certain angle relative to the sleeve 40.

The first support arm 42 and the second support arm 44 are both located at the periphery of the inner sleeve 2, and a first limiting portion 43 and a second limiting portion 25 for limiting the moving stroke of the sleeve 40 towards the first end 1a of the housing 1 are arranged between the second support arm 44 and the inner sleeve 2, and the first limiting portion 43 and the second limiting portion 25 are in clamping fit.

In this embodiment, as shown in fig. 13, the first position-limiting portion 43 is disposed at the head of the second support arm 44, the second position-limiting portion 25 is disposed on the outer wall of the inner sleeve 2, and the first position-limiting portion 43 can be engaged with the second position-limiting portion 25 to limit the downward movement stroke of the protection sleeve 4; in addition, the fixed frame 7 is provided with a sliding groove 71 which is in sliding fit with the second support arm 44 along the axial direction, and the second support arm 44 is embedded in the sliding groove 71 in a sliding manner so as to limit the moving track of the protective sleeve 4.

The outer wall of the inner sleeve 2 is formed with a clamping part 26, the second elastic member 6 is a spring, one end of the spring is located in the sleeve 40 and is abutted against the sleeve 40, and the other end of the spring is abutted against the clamping part 26 on the inner sleeve 2, so that the protective sleeve 4 always has a tendency of being exposed out of the first end 1a of the shell 1, but the protective sleeve 4 cannot be separated from the shell 1 due to the cooperation of the first limiting part 43 and the second limiting part 25.

The present embodiment prevents the moving speed of the slide part 32 along the slide rail 22 from being excessively fast by the following structure:

as shown in fig. 4, 5, 11, and 12, the rotating sleeve 3 is formed with a rotating shaft 33 extending toward the second end 1b of the housing 1, the fixing frame 7 is formed with a fixing sleeve 72, the rotating shaft 33 is rotatably inserted into the fixing sleeve 72, the fixing sleeve 72 is provided with two (or one or more) mounting grooves 721 spaced along the radial direction of the fixing sleeve 72 on the end surface facing the second end 1b of the housing 1, each mounting groove 721 extends along the circumferential direction of the fixing sleeve 72 and is annular, and each mounting groove 721 contains a damping medium.

The shaft 33 is axially slidably engaged with a damper 73, the damper 73 is provided with a key 732, and the shaft 33 is provided with a key groove 331 along the axial direction thereof, so that the damper 73 is engaged with the key groove of the shaft 33, and the shaft 33 can axially move relative to the damper 73 and cannot rotate. The damping member 73 is partially rotatably disposed in the mounting groove 721, and in the present embodiment, the damping member 73 is cylindrical and has an insertion portion 731 capable of being inserted into the mounting groove 721.

During the movement of the sliding part 32 along the slide rail 22, the rotating shaft 33 drives the damping member 73 to rotate, and the damping member 73 performs a certain delayed rotation function due to the resistance of the damping medium.

As shown in fig. 12 to 14, the rotating shaft 33 is further sleeved with a sliding disc 34 capable of moving along the axial direction thereof, a protrusion 341 is disposed on an outer wall of the sliding disc 34, a guide groove 75 is disposed on the fixed frame 7 along the axial direction thereof, and the protrusion 341 is slidably disposed in the guide groove 75 of the fixed frame 7, so that the sliding disc 34 can move axially but cannot rotate circumferentially.

The sliding disc 34 and the fixed sleeve 72 are axially spaced, the first elastic element 5 is a spring, and two ends of the first elastic element respectively abut against the sliding disc 34 and the fixed sleeve 72, so that the rotating sleeve 3 keeps the trend of moving towards the first end 1a of the shell 1, and meanwhile, the sliding disc 34 cannot rotate, so that the first elastic element 5 cannot be driven to partially twist when the rotating sleeve 3 rotates.

The working principle of the injection training device of the present embodiment is as follows:

a, in an initial state, as shown in fig. 12, 13, and 14, the protective sleeve 4 partially extends out of the housing 1, the pushing portion 41 on the protective sleeve 4 is located below the pushing portion 31 on the rotating sleeve 3, and the sliding portion 32 abuts against the rib 23 and is located on the opposite side of the sliding rail 22;

b, the cover 12 is taken down, so that the protective sleeve 4 contacts the skin and presses the skin, that is, at this time, the protective sleeve 4 is forced to move towards the second end 1b side of the housing 1, the second elastic member 6 is compressed, the fourth surface 411 of the pushing part 41 on the protective sleeve 4 pushes the second surface 311 of the pushing part 31 on the rotating sleeve 3, the sliding part 32 on the rotating sleeve 3 slides along the rib 23 on the inner sleeve 2, and therefore, the sliding part 32 abuts against the rib 23, so that the rotating sleeve 3 can only move upwards and cannot rotate, as shown in fig. 15;

c, when the sliding part 32 moves to the upper end of the rib 23, the rotating sleeve 3 moves to the upper limit position, at this time, the fourth surface 411 of the pushing part 41 on the protecting sleeve 4 continues to push the second surface 311 of the pushing part 31 on the rotating sleeve 3, and the fourth surface 411 and the second surface 311 are matched due to the inclined surface, at this time, the protecting sleeve 4 continues to move upwards, so that the rotating sleeve 3 is forced to rotate clockwise (looking down according to fig. 15), the rotating sleeve 3 rotates by a certain angle until the sliding part 32 is completely separated from the contact with the rib 23, and at this time, the pushing part 41 and the pushing part 31 are staggered, as shown in fig. 16;

d, since the sliding rail 22 is connected to the middle of the rib 23, the sliding portion 32 is similar to a suspended state, and the rotating sleeve 3 moves downward rapidly under the action of the first elastic member 5 until the sliding portion 32 on the rotating sleeve 3 hits the joint between the starting end of the sliding rail 22 and the rib 23, and generates a first sound, which prompts the user to start injection, as shown in fig. 17;

e. then, under the continuous action of the first elastic member 5, the sliding portion 32 on the rotating sleeve 3 moves to the first end 1a side of the housing while rotating along the sliding rail 22 on the inner sleeve 2, and at this time, the injection process is performed, and a delay action occurs due to the damping force between the damping member 73 and the damping medium, that is, the rotating sleeve 3 at this time moves down slowly and rotates, as shown in fig. 18;

f. when the sliding part 32 on the rotating sleeve 3 moves to the end of the sliding rail 22 on the inner sleeve 2, it will move down rapidly along the guiding strip 24, and when the sliding part 32 hits the flange 21, it will sound a second sound, which will prompt the user that the injection is completed, as shown in fig. 19, and at this time, the first arm 42 of the protecting sleeve 4 is located at the next abutting part 31 on the rotating sleeve 3;

g. then the injection training device is removed from the skin, at this time, the compression state of the second elastic element 6 is released, so that the protective cover 4 moves downward, and at this time, the second arm 44 of the protective cover 4 moves along the sliding groove 71 of the fixing frame 7, the third surface 412 of the pushing portion 41 moves along the first surface 312 of the next abutting portion 31, in this process, the first arm 42 swings laterally by a certain angle to avoid interference between the rotating cover 3 and the protective cover 4, until the third surface 412 of the pushing portion 41 is separated from the first surface 312 of the abutting portion 31, the first arm 42 is under the action of its own restoring force, the pushing portion 41 is located below the abutting portion 31, at this time, the injection training device is reset to the initial state for next use, as shown in fig. 13 and 14, and after the cap 12 is covered, as shown in fig. 12.

Claims

1. An injection training device with sound prompt function comprises

A housing (1) which is hollow inside, wherein the housing (1) is provided with a first end (1a) and a second end (1b) along the axial direction;

it is characterized by also comprising

The inner sleeve (2) is fixedly arranged in the shell (1) and extends along the axial direction of the shell (1), a flange (21) extending along the circumferential direction of the inner sleeve (2) and at least two sections of sliding rails (22) arranged along the circumferential direction of the inner sleeve (2) at intervals are sequentially formed on the outer wall of the inner sleeve (2), the sliding rails (22) are obliquely arranged and have intervals with the flange (21), ribs (23) extending along the axial direction of the shell (1) are formed at the starting end of each sliding rail (22), and the middle parts of the ribs (23) are connected with the sliding rails (22);

the rotating sleeve (3) is arranged in the shell (1) and movably sleeved on the inner sleeve (2), a pushing part (31) is arranged on the outer wall of the rotating sleeve (3), a sliding part (32) capable of generating audible sound when impacting on the starting end of the sliding rail (22) and the flange (21) is arranged on the inner wall of the rotating sleeve (3), the sliding part (32) can move along the sliding rail (22), and in an initial state, the sliding part (32) abuts against the rib (23) and is positioned on the opposite side of the sliding rail (22);

the protective sleeve (4) is slidably arranged at the first end (1a) of the shell (1) and at least partially extends out of the shell (1), a pushing part (41) capable of pushing the pushing part (31) to move towards the second end (1b) of the shell (1) is arranged on the protective sleeve (4), and the pushing part (41) is matched with a contact joint surface inclined plane of the pushing part (31);

a first elastic element (5) acting on the rotating sleeve (3) to keep the rotating sleeve (3) in a trend of moving towards the first end (1a) of the shell (1);

the second elastic piece (6) acts on the protective sleeve (4) to ensure that the protective sleeve (4) keeps the trend of extending out of the shell (1);

the pushing and supporting part (31) is in a rib shape extending along the axial direction of the shell (1), one side face of the pushing and supporting part (31) is a first face (312), the end face, facing the first end (1a) of the shell (1), of the pushing and supporting part (31) is a second face (311), the end face, facing the first end (1a) of the shell (1), of the pushing part (41) of the protective sleeve (4) is a third face (412), the end face, facing the second end (1b) of the shell (1), of the pushing part (41) is a fourth face (411), the first face (312) is in inclined plane fit with the third face (412), and the second face (311) is in inclined plane fit with the fourth face (411).

2. The injection training device with the audible prompting function according to claim 1, characterized in that: the protective sleeve (4) comprises a sleeve (40) and a first support arm (42) formed at the top of the sleeve (40), the first support arm (42) extends axially along the shell (1), and the pushing portion (41) is formed at the head of the first support arm (42).

3. An injection training device with an audible prompting function according to claim 2, characterized in that: the top of sleeve (40) still the shaping has along casing (1) axial extension's second support arm (44), be equipped with mount (7) in casing (1), spout (71) with second support arm (44) sliding fit are seted up along its axial on mount (7).

4. An injection training device with an audible prompting function according to any one of claims 1 to 3, characterized in that: the protective sheath (4) at least partially overlap and locate on endotheca (2), just be equipped with between protective sheath (4) and endotheca (2) and restrict first spacing portion (43) and the spacing portion of second (25) of protective sheath (4) towards the removal stroke of casing (1) first end (1a), first spacing portion (43) and the spacing portion of second (25) card are to the cooperation.

5. An injection training device with an audible prompting function according to any one of claims 1 to 3, characterized in that: the outer wall of the inner sleeve (2) is further provided with guide strips (24) which are consistent with the number of the slide rails (22) and axially extend along the shell (1), the guide strips (24) extend towards the first end (1a) side of the shell, two ends of each guide strip (24) are respectively connected with the tail end of each slide rail (22) and the corresponding flange (21), and the space between each guide strip (24) and the adjacent rib (23) is matched with the width of the sliding part (32).

6. An injection training device with an audible prompting function according to any one of claims 1 to 3, characterized in that: the shaping has pivot (33) that extend towards casing (1) second end (1b) on rotating cover (3), pivot (33) rotate insert locate one relative casing (1) fixed cover (72) that set up, fixed cover (72) have seted up mounting groove (721) on the terminal surface towards casing (1) second end (1b), contain damping medium and can be relative mounting groove (721) pivoted damping piece (73) in this mounting groove (721), pivot (33) can link to each other with damping piece (73) axially sliding.

7. The injection training device with the audible prompting function as claimed in claim 6, wherein: the damping piece is characterized in that the number of the mounting grooves (721) is at least two, the mounting grooves (721) are arranged along the radial direction of the fixing sleeve (72) at intervals, each mounting groove (721) extends along the circumferential direction of the fixing sleeve (72), correspondingly, the damping piece (73) is columnar and is provided with an insertion part (731) which can be correspondingly inserted into the mounting grooves (721).

8. The injection training device with the audible prompting function as claimed in claim 6, wherein: still the cover is equipped with and is equipped with slip dish (34) that can follow its axial displacement on pivot (33), slip dish (34) and fixed cover (72) interval set up, first elastic component (5) are the spring and both ends lean on respectively to lean on slip dish (34) and fixed cover (72).