CN113209423B

CN113209423B - Automatic injection device with sound prompt function

Info

Publication number: CN113209423B
Application number: CN202110553266.9A
Authority: CN
Inventors: 侯士双; 袁霞林; 陈常娇; 胡高扬; 徐祥俊
Original assignee: Ningbo Ruiai Product Design Co ltd
Current assignee: Ningbo Ruiai Product Design Co ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2022-10-14
Anticipated expiration: 2041-05-20
Also published as: CN113209423A

Abstract

The invention relates to an automatic injection device with a sound prompt function, which comprises a tube body, wherein a fixed sleeve is arranged in the tube body; a needle tube; a piston tube; a piston; a third positioning member; the sounding body is arranged on the outer side of the piston tube in a vertically movable manner, can abut against the front face of the third positioning piece, and can move upwards to impact with the limiting part on the fixed sleeve after getting rid of the constraint of the third positioning piece in the state that the piston is pushed to the bottom of the needle tube by the piston tube so as to send out a sound indicating the completion of injection; the second elastic piece acts on the sounding body to enable the sounding body to always keep the trend of moving upwards. The sound producing body can strike the diapire of fixed cover to sound, with the suggestion user, improved injection device's use convenience.

Description

Automatic injection device with sound prompt function

Technical Field

The invention belongs to the technical field of medical appliances, and particularly relates to an automatic injection device with a sound 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. 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 "an automatic injection device" disclosed in the chinese patent application with patent No. CN202010409755.2 (publication No. CN 111450356A), the device includes a tube with an open lower end, a fixed sleeve positioned in the tube, and an injection assembly disposed in the tube; the sounding part comprises an annular body which is coaxially and movably arranged in the fixed sleeve and a sounding block which is arranged on the outer peripheral wall of the annular body, the sounding block radially penetrates through the fixed sleeve, and the sounding block and the fixed sleeve are oppositely positioned through a positioning structure; the fixed sleeve is provided with a sliding groove for the sounding block to move axially and downwards after getting rid of the constraint of the positioning structure, the sounding block can emit sound for indicating the start of injection when impacting on the inner wall of the sliding groove, the sounding piece and the injection assembly are linked through a linkage structure, and the injection assembly starts to inject when the sounding block sounds; the movable sleeve is sleeved on the fixed sleeve, the lower end of the movable sleeve can extend out of the pipe body and can move upwards relative to the fixed sleeve when being pressed by skin, and the movable sleeve is provided with a pushing part which can push the sounding block to move when moving upwards so as to enable the sounding block to release the constraint of the positioning structure; the first elastic piece is arranged in the pipe body and acts on the sounding piece to enable the sounding piece to always keep a downward moving trend; the second elastic piece is arranged in the tube body and acts on the movable sleeve to enable the movable sleeve to always keep the trend of moving downwards.

However, the injection device cannot send a prompt message to the user when the injection is completed so as to inform the user of the completion of the injection, so that the user is inconvenient to remove the injection device from the skin in time after the injection is completed, the injection is not completed, the user removes the injection device from the skin, the liquid medicine is wasted, the treatment effect is influenced, and further improvement is needed.

Disclosure of Invention

The present invention is directed to an automatic injection device having a sound prompt function that can prompt a user with a sound when an injection is completed.

The technical scheme adopted by the invention for solving the technical problems is as follows: an automatic injection device with sound prompt function, includes a pipe body, be equipped with in the body

The fixed sleeve is fixedly arranged relative to the pipe body;

the needle tube is fixedly arranged below the fixed sleeve;

the piston tube is inserted in the fixed sleeve and can move axially relative to the fixed sleeve, and the lower end of the piston tube is inserted in the needle tube;

the piston is arranged in the needle tube and can be pushed downwards by the piston tube;

it is characterized by also comprising

The third positioning piece is positioned on the outer side of the piston pipe, extends along the axial lead direction of the piston pipe and can generate elastic deformation along the radial direction of the piston pipe, and in addition, the back surface of the third positioning piece can be abutted against the peripheral wall of the piston pipe;

the sounding body is arranged outside the piston tube and can move along the axial lead direction of the piston tube, the sounding body can be abutted against the front face of the third positioning piece, and under the condition that the piston is pushed to the bottom of the needle tube by the piston tube, the sounding body can get rid of the constraint of the third positioning piece and move upwards until the sounding body collides with the limiting part on the fixed sleeve, so that the sounding body can emit a sound indicating the completion of injection;

the second elastic piece acts on the sounding body to enable the sounding body to always keep the trend of moving upwards.

The third positioning piece can have a plurality of structural forms, wherein one simpler structural form is as follows: the third setting element includes extension arm and location portion, the extension arm is followed piston pipe axial lead direction extends, and the one end of extension arm links to each other with fixed cover, the other end of extension arm links to each other with location portion, the back of location portion can offset with the periphery wall of piston pipe, the front of location portion can offset with the sound producing body.

Under the state that the piston is promoted to the needle tubing bottom by the piston tube, because lost stopping of piston tube, the extension arm can inwards swing certain angle, but in order to prevent extension arm swing angle undersize, location portion still supports the sounding body and leads to the sounding body can not upwards remove, the front of location portion has the third inclined plane that becomes thin gradually along the downstream direction wall thickness of piston tube, the wall that the front of the sounding body that offsets with the location portion is the fourth inclined plane with third inclined plane matched with. Even if the positioning part still supports against the sounding body, the sounding body can move upwards for a certain distance under the action of the second elastic piece, and the fourth inclined plane extrudes the third inclined plane in the process until the positioning part completely releases the constraint on the sounding body.

In order to facilitate the setting up of third setting element and sound generating body, the lower extreme of fixed cover is equipped with the fixed pipe of cover on the piston pipe, the external diameter of fixed pipe is less than the external diameter of fixed cover and forms spacing portion, the through-hole has been seted up on the perisporium of fixed pipe, the third setting element is located the through-hole, the upper end of extension arm links to each other with the roof of through-hole, the sound generating body is cyclic annular and the cover is established on fixed pipe, the fourth inclined plane is located the top of the internal face of sound generating body.

In order to guide the moving track of the sounding body, a guide structure is arranged between the inner wall surface of the sounding body and the outer wall surface of the fixed pipe, and the guide structure comprises a vertically extending sliding groove and a sliding block in sliding fit with the sliding groove.

The structure is simple, the fixed sleeve and the fixed pipe are integrally formed, so that a connecting structure of the fixed sleeve and the fixed pipe is not required to be arranged; of course, the retaining sleeve and the retaining tube may be removably connected by a connecting structure (e.g., a snap).

In order to position the needle tube in the fixing sleeve, a fixing frame sleeved on the needle tube is fixedly arranged in the needle tube, the top end of the needle tube is exposed out of the fixing frame, a blocking part for placing the needle tube thereon is arranged on the fixing frame, a positioning frame capable of abutting against the top end of the needle tube is arranged above the fixing frame, and the positioning frame is positioned below the sounding body.

Preferably, the second elastic piece is a spring, and two ends of the second elastic piece respectively abut against the positioning frame and the sounding body. The positioning frame and the blocking part are matched together to position the needle tube, and the positioning frame is soft and supports against the needle tube under the action of the second elastic piece, so that the needle tube is allowed to have certain tolerance during manufacturing. Because the position of locating rack has certain movement allowance in the upper and lower direction, the needle tubing has certain deviation in the allowed range when the preparation, and the locating rack has certain movement allowance in the upper and lower direction, then can allow the preparation deviation of needle tubing, otherwise needle tubing length is longer, can interfere with the locating rack, leads to unable assembly, and needle tubing length is short time, can't touch the locating rack again, leads to the needle tubing not hard up.

Preferably, the stopper is provided at the bottom of the holder and extends toward the needle cannula so that the needle cannula rests on the stopper.

Compared with the prior art, the invention has the advantages that: according to the invention, the sounding body and the third positioning piece are arranged, so that when the liquid medicine injection is finished, the sounding body can impact the bottom wall of the fixing sleeve to make a sound, so as to prompt a user, and the use convenience of the injection device is improved; and the fixed sleeve has two purposes, not only is used for generating the sound for starting injection by matching with the sound generating piece in CN202010409755.2, but also can generate the sound for finishing injection by matching with the sound generating body, thus reducing the related parts of the injection device.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment 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 (the injection is not completed);

FIG. 4 is an enlarged view of FIG. 2 at A (injection completed, sounding body starting to move upward);

FIG. 5 is an enlarged view of FIG. 2 at A (injection completed, sounding body impacting the harness);

fig. 6 is a schematic view of the structure of the fixing sleeve and the fixing tube of fig. 2;

FIG. 7 is a schematic diagram of the sounding body in FIG. 2;

FIG. 8 is a schematic view of the assembly of FIG. 6 with a sounding body;

FIG. 9 is a cross-sectional view of the syringe and holder of FIG. 2;

FIG. 10 is a cross-sectional view in the other direction of FIG. 1 (with the cap mounted on the tube body);

FIG. 11 is a cross-sectional view in the other direction of FIG. 1 (with the cap removed from the body and the boot not pressed upward);

FIG. 12 is a cross-sectional view in the other direction of FIG. 1 (the cap body is removed from the pipe body and the movable sleeve is pressed upward);

fig. 13 is a schematic structural view of the cap of fig. 12.

Detailed Description

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

As shown in fig. 1 to 13, the automatic injection device with a sound prompt function according to the preferred embodiment includes a tube body 1 having an open lower end, a cap body 2 detachably covering the lower end of the tube body 1, and a movable sleeve 3, a fixed sleeve 4, an injection assembly, a sounding body 5, a first elastic member 61, a second elastic member 62, and the like, which are disposed in the tube body 1. In this embodiment, the end of the pipe body 1 to which the cap 2 can be attached is defined as a lower end, and the other end is defined as an upper end.

As shown in fig. 1, 2, and 10-13, the movable sleeve 3 is vertically arranged (i.e. along the central axis of the pipe body 1), and the movable sleeve 3 can move up and down relative to the pipe body 1. The lower end of the movable sleeve 3 can extend out of the tube body 1 and move upwards relative to the tube body 1 when pressed by skin to trigger the injection assembly to inject (how to trigger the injection assembly by the upward movement of the movable sleeve 3 is described in detail in CN202010409755.2, which is not described herein), and the first elastic member 61 acts on the movable sleeve 3 to keep the movable sleeve 3 always moving downwards.

The cap body 2 is provided with a first positioning piece, the pipe body 1 is internally provided with a second positioning piece, and the first positioning piece extrudes the second positioning piece under the state that the cap body 2 is covered on the pipe body 1, so that the second positioning piece is abutted against the movable sleeve 3, and the movable sleeve 3 is limited from moving upwards; under the state that the cap body 2 is dismantled from the pipe body 1, the second positioning piece can release the constraint on the movable sleeve 3, and the movable sleeve 3 can move upwards relative to the pipe body 1. The first positioning piece and the second positioning piece enable the operation process of a user to be convenient, the cap body 2 can be effectively covered under the condition of the tube body 1, the position of the movable sleeve 3 is locked, and accidental triggering of the injection device is avoided.

In this embodiment, the first positioning element and the second positioning element have the following specific structures: as shown in fig. 13, the first positioning member is a supporting arm 21 formed on the cap body 2 and extending vertically, specifically, the supporting arm 21 extends vertically and upwardly from the inner bottom surface of the cap body 2, and in order to be stressed evenly, so that there are two supporting arms 21, which are distributed symmetrically, but not limited to two, the specific number of the supporting arms 21 can be set as required, and meanwhile, in consideration of the stability of the two supporting arms 21, an arc-shaped surface 22 connecting the two supporting arms 21 is formed on the inner bottom surface of the cap body 2. The second positioning element comprises a swing arm 71 and a stopper 72, one end of the swing arm 71 is fixedly connected with the inner wall of the pipe body 1, the other end of the swing arm is connected with the stopper 72, the stopper 72 is positioned at the inner side of the movable sleeve 3, and the peripheral wall of the movable sleeve 3 is provided with a positioning hole 31. In the state that the cap body 2 is covered on the tube body 1 (see fig. 10), the arm 21 is located inside the stopper 72 and presses the stopper 72 outwards, the stopper 72 is pressed outwards and located inside the positioning hole 31, and when the movable sleeve 3 is pushed to move upwards, the stopper 72 is pressed against the bottom wall of the positioning hole 31 to limit the upward movement of the movable sleeve 3.

The top end of the support arm 21 has a first inclined surface 211, the surface of the stopper 72 contacting the support arm 21 is a second inclined surface 721, and the first inclined surface 211 and the second inclined surface 721 are matched and both inclined from top to bottom in the direction away from the central line of the tube 1.

The cooperation of the first inclined surface 211 and the second inclined surface 721 can prevent the interference of the arm 21 by the stopper 72, which results in the arm 21 not moving upward and thus not pressing the stopper 72 outward. The first inclined surface 211 and the second inclined surface 721 are simple in matched structural form and are arranged relatively compactly, so that the stop 72 can be effectively locked with the movable sleeve 3, and the locking failure of the stop 72 is avoided.

Of course, the arm 21 and the stop 72 may have other matching forms, such as matching of an inclined surface and a vertical surface: the top end of the support arm 21 is provided with a first inclined surface 211, and the surface of the stop block 72, which is in contact with the support arm 21, is a vertical surface; or one side of the support arm 21 facing the stopper 72 is a vertical surface, and the surface of the stopper 72 contacting the support arm 21 is a second inclined surface 721; the first inclined plane and the second inclined plane incline from top to bottom in the direction far away from or close to the central line of the pipe body.

When the injection device is not used, the cap body 2 is covered on the tube body 1, the support arm 21 is positioned at the inner side of the stop block 72 and extrudes the stop block 72 outwards to be abutted against the bottom wall of the positioning hole 31, and at the moment, the movable sleeve 3 cannot move upwards; when the injection device is used, the cap body 2 is taken down, the support arm 21 on the cap body 2 moves out of the tube body 1, the support arm 21 extrudes the stopper 72 to disappear, the swing arm 71 deflects inwards in the direction away from the movable sleeve 3 at the moment, the stopper 72 is driven to be separated from the positioning hole 31 on the movable sleeve 3, and the lower end of the movable sleeve 3 moves upwards relative to the tube body 1 when being pressed by skin to trigger the injection assembly to inject.

By last, the cooperation of first setting element and second setting element can prevent that injection device when not being in operating condition (when the cap body 2 lid was established on body 1 promptly), and even if the movable sleeve 3 received the impact and had the trend of rebound, can not trigger injection assembly yet, causes the waste of liquid medicine or injection device scrapps.

As shown in fig. 1 to 9, the injection device realizes the function of making a sound to prompt a user when the injection is completed by the following structure:

the injection assembly comprises a needle tube 81, a piston tube 82 and a piston 83 (of course, the injection assembly comprises not only these three components, but also a piston rod, a third elastic element and a needle head shown in CN202010409755.2, since the piston rod, the third elastic element and the needle head are not the main components for realizing the sound production when the injection is completed, and the details are not described here).

The fixed sleeve 4 is fixedly arranged relative to the pipe body 1, the movable sleeve 3 is sleeved on the fixed sleeve 4, the needle tube 81 is fixedly arranged below the fixed sleeve 4, the piston tube 82 is inserted in the fixed sleeve 4 and can move axially relative to the fixed sleeve 4, the lower end of the piston tube 82 is inserted in the needle tube 81, and the piston 83 is arranged in the needle tube 81 and can be pushed downwards by the piston tube 82.

As shown in fig. 2, 3 and 6, in this embodiment, a fixed tube 41 sleeved on the piston tube 82 is formed at the lower end of the fixed sleeve 4 (of course, the fixed sleeve 4 and the fixed tube 41 may be detachably connected), the outer diameter of the fixed tube 41 is smaller than the outer diameter of the fixed sleeve 4, a shoulder 43 is formed between the fixed tube 41 and the fixed tube 41, the shoulder 43 forms a limiting part for the upward movement of the sounding body 5, a through hole 42 is formed in the peripheral wall of the fixed tube 41, a third positioning element 9 is disposed in the through hole 42, that is, the third positioning element 9 is located outside the piston tube 82, preferably, a plurality of third positioning elements 9 may be symmetrically disposed, so as to achieve the stability of the locking process.

In this embodiment, the third positioning member 9 includes an extension arm 91 and a positioning portion 92, the extension arm 91 extends vertically, an upper end of the extension arm 91 is connected to a top wall of the through hole 42, a lower end of the extension arm 91 is connected to the positioning portion 92, a back surface (i.e., an inner side surface) of the positioning portion 92 can abut against an outer peripheral wall of the piston tube 82, and a front surface (i.e., an outer side surface) of the positioning portion 92 has a third inclined surface 921 of which a wall thickness becomes thinner gradually along a downward movement direction of the piston tube 82. The third positioning element 9 works on the principle that the position change of the positioning portion 92 in the radial direction of the piston tube 82 is changed by the elastic deformation of the extension arm 91, so as to improve the stability and reliability of the locking effect. Of course, the third positioning element 9 can also have other configurations, as long as it is sufficient to position the piston tube 82 and to deform it radially relative to the piston tube 82.

The sounding body 5 can be disposed outside the piston tube 82 in a vertically movable manner, as shown in fig. 2, 7, and 8, in this embodiment, the sounding body 5 is annular and is sleeved on the fixed tube 41, a sliding block 51 is disposed on an inner wall surface of the sounding body 5, a sliding slot 411 extending vertically is disposed on an outer wall surface of the fixed tube 41, the sliding block 51 can move along the sliding slot 411, and the sliding block 51 and the sliding slot 411 together form a guiding structure. Of course, the slider 51 may be provided on the fixed pipe 41 and the slide slot 411 may be provided on the sounding body 5.

The top of the sounding body 5 can abut against the front surface of the positioning portion 92 (of course, a protrusion on the inner wall of the sounding body 5 can abut against the positioning portion 92), and when the sounding body 5 abuts against the positioning portion 92, the sounding body 5 cannot move upward, but the sounding body 5 always tends to move upward under the action of the second elastic member 62. When the piston 83 is pushed to the bottom of the needle tube 81 by the piston tube 82, the extension arm 91 can swing inward (the original position of the piston tube 82) by a certain angle, the sounding body 5 can get rid of the constraint of the positioning part 92, and move upward under the action of the second elastic part 62 until colliding with the limit part of the fixing sleeve 4, and the sound indicating the completion of the injection is generated.

As can be seen from the above, in a state where the piston 83 is pushed to the bottom of the needle tube 81 by the piston tube 82, the extension arm 91 can swing inward by a certain angle because the blockage of the piston tube 82 is lost, but in order to prevent the swing angle of the extension arm 91 from being too small, the positioning part 92 still abuts against the sounding body 5, so that the sounding body 5 cannot move upward, the wall surface of the sounding body 5 abutting against the front surface of the positioning part 92 is the fourth inclined surface 52 matching with the third inclined surface 921, and the fourth inclined surface 52 is located at the top end of the inner wall surface of the sounding body 5. Even if the positioning portion 92 still abuts against the sounding body 5, the sounding body 5 will move upward by a certain distance under the action of the second elastic member 62, and in the process, the fourth inclined surface 52 presses the third inclined surface 921 until the positioning portion 92 completely releases the constraint on the sounding body 5.

The specific working process of the generator 5 is as follows:

before the piston 83 moves to the bottom of the needle tube 81, the back surface of the positioning part 92 abuts against the piston tube 82, the front surface of the positioning part 92 abuts against the sounding body 5, and the sounding body 5 cannot move upwards, as shown in fig. 3;

as shown in fig. 4, when the piston 83 moves to the bottom of the needle tube 81, the liquid medicine is completely pushed out, at this time, the piston tube 82 moves downward to be separated from the contact with the positioning portion 92, the positioning portion 92 can move inward (toward the position where the piston tube 82 originally locates), at this time, the positioning portion 92 cannot completely position the sounding body 5, the sounding body 5 moves upward under the action of the second elastic member 62, the fourth inclined surface 52 further presses the third inclined surface 921 during the upward movement of the sounding body 5, so that the positioning portion 92 swings inward (toward the position where the piston tube 82 originally locates) further, the limitation on the sounding body 5 is completely lost, and the sounding body 5 continues to move upward under the action of the second elastic member 62 until the sounding body 5 collides with the limiting portion of the fixing sleeve 4 to generate a sound indicating the completion of injection, as shown in fig. 5.

The injection device of this embodiment is a disposable item and therefore does not take into account the problem of resetting the components after completion of the injection.

As shown in fig. 2 and 9, a fixing frame 01 sleeved on the needle tube 81 is fixedly arranged in the tube body 1, the top end of the needle tube 81 is exposed outside the fixing frame 01, a blocking portion 011 extending towards the needle tube 81 is arranged at the bottom of the fixing frame 01, the needle tube 81 is partially placed on the blocking portion 011, and a positioning frame 02 capable of pressing on the top end of the needle tube 81 is arranged above the fixing frame 01. The second elastic member 62 is a spring, and two ends of the second elastic member respectively abut against the positioning frame 02 and the sounding body 5.

The positioning frame 02 and the stopping portion 011 cooperate to position the needle tube 81, and the positioning frame 02 is pressed against the needle tube 81 due to the second elastic member 62, so as to allow the needle tube 81 to have a certain tolerance during manufacturing. Because the position of the positioning frame 02 has a certain movement allowance in the vertical direction, when the needle tube 81 is manufactured, the length of the needle tube 81 has a certain deviation in an allowable range, and the positioning frame 02 has a certain movement allowance in the vertical direction, so that the manufacturing deviation of the needle tube 81 can be allowed, otherwise, when the length of the needle tube 81 is longer, the needle tube 81 interferes with the positioning frame 02 to cause incapability of assembling, and when the length of the needle tube 81 is shorter, the needle tube 81 cannot contact with the positioning frame 02 to cause looseness of the needle tube 81.

In the present embodiment, the structures of sounding when the injection is completed and the structures of preventing the movable sleeve 3 from moving upward due to impact are mainly described, but the injection device of the present embodiment does not only include these structures, and other structures of the automatic injection device of the present embodiment can refer to chinese patent application having application numbers CN202010409755.2, publication numbers CN111450356A, and name "an automatic injection device".

Claims

1. An automatic injection device with sound prompt function comprises a tube body (1), wherein the tube body (1) is internally provided with a sound prompt device

A fixed sleeve (4) which is fixedly arranged relative to the pipe body (1);

the needle tube (81) is fixedly arranged below the fixed sleeve (4);

the piston pipe (82) is inserted into the fixed sleeve (4) and can move axially relative to the fixed sleeve (4), and the lower end of the piston pipe (82) is inserted into the needle tube (81);

a piston (83) which is provided in the needle tube (81) and can be pushed down by the piston tube (82);

it is characterized by also comprising

The third positioning piece (9) is positioned on the outer side of the piston pipe (82), the third positioning piece (9) extends along the axial lead direction of the piston pipe (82) and can generate elastic deformation along the radial direction of the piston pipe (82), and in addition, the back surface of the third positioning piece (9) can be abutted against the outer peripheral wall of the piston pipe (82);

the sounding body (5) is arranged on the outer side of the piston pipe (82) and can move along the axial lead direction of the piston pipe (82), the sounding body (5) can abut against the front face of the third positioning piece (9), and under the condition that the piston (83) is pushed to the bottom of the needle pipe (81) by the piston pipe (82), the sounding body (5) can break away from the constraint of the third positioning piece (9) and move upwards until the sounding body collides with a limiting part on the fixed sleeve (4), so that the sound indicating the completion of injection is given out;

the second elastic piece (62) acts on the sounding body (5) to enable the sounding body (5) to always keep the trend of moving upwards;

the lower extreme of fixed cover (4) is equipped with fixed pipe (41) of cover establishing on piston pipe (82), the external diameter of fixed pipe (41) is less than the external diameter of fixed cover (4) and forms spacing portion, through-hole (42) have been seted up on the perisporium of fixed pipe (41), third setting element (9) are located through-hole (42).

2. The automatic injection device with sound prompt function according to claim 1, characterized in that: third setting element (9) are including extension arm (91) and location portion (92), extension arm (91) are followed piston tube axial lead direction extends, and the one end of extension arm (91) links to each other with fixed cover (4), the other end of extension arm (91) links to each other with location portion (92), the back of location portion (92) can offset with the periphery wall of piston tube (82), the front ability and the sound generating body (5) of location portion (92) offset.

3. The automatic injection device with sound prompt function according to claim 2, characterized in that: the front surface of the positioning part (92) is provided with a third inclined surface (921) with the wall thickness gradually becoming thinner along the downward moving direction of the piston pipe (82), and the wall surface of the sounding body (5) which is abutted against the front surface of the positioning part (92) is a fourth inclined surface (52) matched with the third inclined surface (921).

4. The automatic injection device with sound prompt function according to claim 3, characterized in that: the upper end of extension arm (91) links to each other with the roof of through-hole (42), sound generating body (5) are cyclic annular and overlap and establish on fixed pipe (41), fourth inclined plane (52) are located the top of the internal face of sound generating body (5).

5. The automatic injection device with sound prompt function according to claim 4, characterized in that: a guide structure is arranged between the inner wall surface of the sounding body (5) and the outer wall surface of the fixed pipe (41), and the guide structure comprises a vertically extending sliding groove (411) and a sliding block (51) in sliding fit with the sliding groove (411).

6. The automatic injection device with sound prompt function according to claim 4, characterized in that: the fixing sleeve (4) and the fixing pipe (41) are integrally formed, or the fixing sleeve (4) and the fixing pipe (41) can be detachably connected.

7. The automatic injection device with sound prompt function according to any one of claims 1 to 6, characterized in that: body (1) internal fixation is equipped with the cover and establishes at needle tubing (81) upper mounting bracket (01), the top of needle tubing (81) is exposed outside mount (01), just be equipped with on mount (01) and supply needle tubing (81) to shelve fender portion (011) above that, mount (01) top is equipped with and supports locating rack (02) that press on needle tubing (81) top, and locating rack (02) are located sounding body (5) below.

8. The automatic injection device with sound prompt function of claim 7, characterized in that: the second elastic piece (62) is a spring, and two ends of the second elastic piece respectively lean against the positioning frame (02) and the sounding body (5).

9. The automatic injection device with sound prompt function according to claim 7, characterized in that: the blocking part (011) is arranged at the bottom of the fixing frame (01) and extends towards the needle tube (81).