CN111450356A

CN111450356A - Automatic injection device

Info

Publication number: CN111450356A
Application number: CN202010409755.2A
Authority: CN
Inventors: 侯士双; 袁霞林; 陈常娇; 胡高扬
Original assignee: Ningbo Ruiai Product Design Co ltd
Current assignee: Ningbo Ruiai Product Design Co ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-07-28

Abstract

The invention relates to an automatic injection device, which comprises a tube body, a fixed sleeve and an injection assembly, wherein the tube body is provided with a first end and a second end; the sounding piece comprises an annular body which is coaxial and movably arranged in the fixed sleeve and a sounding block 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, and the sounding block can make a sound when impacting on the inner wall of the sliding groove; the movable sleeve is sleeved on the fixed sleeve, the lower end of the movable sleeve can extend out of the pipe body, and the movable sleeve is provided with a pushing part which can push the sounding block to move when the movable sleeve moves upwards so as to enable the sounding block to release the constraint of the positioning structure; the first elastic piece acts on the sounding piece to enable the sounding piece to always keep the trend of moving downwards; and the second elastic piece acts on the movable sleeve to enable the movable sleeve to always keep the trend of moving downwards. The sound production piece sounds to prompt the user to start injection, and the safety is high.

Description

Automatic injection device

Technical Field

The invention belongs to the technical field of medical appliances, and particularly relates to an automatic injection device.

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.

The injection training device comprises a shell, an injection simulation assembly and an actuating assembly, wherein the injection simulation assembly and the actuating assembly are arranged in the shell, the actuating assembly drives the injection simulation assembly to move downwards to complete a pricking action, the injection simulation assembly comprises a pipe body filled with damping media, a piston rod arranged in the pipe body, the upper end of the piston rod extends out of the pipe body, the device further comprises a fixed frame, a movable sleeve and a push rod capable of pushing the injection simulation assembly to move upwards and reset, the fixed frame is positioned in the shell, the injection simulation assembly and the actuating assembly are both arranged in the fixed frame, the movable sleeve is sleeved on the fixed frame, the lower end of the movable sleeve can extend out of the shell to be in contact with the skin and move upwards relative to the fixed frame when the movable sleeve is pressed by the skin, the movable sleeve always has a tendency of moving downwards relative to the fixed frame under the action of an elastic piece, the actuating assembly comprises a triggering piece and a locking piece sleeved on the pipe body, the pipe body and the locking piece are locked and matched through the locking piece, an unlocking assembly capable of unlocking the locking piece and capable of enabling the locking piece to unlock the locking piece and to move downwards to abut against a first sound generating lug on the fixed frame, and a first sound generating sound when the piston rod moves from top to the bottom wall of the first firing piece, the first sound generating piece, and the first sound generating lug is arranged on the first sound generating piece.

The device can only be used for training, and if the device is used as a real injector, a plurality of problems exist: 1. the first sound-emitting component is connected with the piston rod, if the audible sound is required to be emitted, the first sound-emitting component is required to impact the bottom wall of the strip-shaped groove at a sufficiently high speed, and because the whole injection simulation assembly moves synchronously with the first sound-emitting component in an initial state, the injection simulation assembly also moves downwards quickly to impact the piston in the needle tube, and the needle tube (not shown in the figure, a tube body of the injection simulation assembly can be movably inserted into the needle tube) is broken due to the excessively high moving speed; if the injection simulation assembly is not operated too fast to prevent the needle tube from being broken, but the first sounding part will probably not sound when it hits the strip-shaped groove, in short, the sounding of the above patent is associated with the operation speed of the injection simulation assembly, which makes it difficult to ensure the sounding without damaging the needle tube; 2. in order to prevent the needle from being exposed, more parts are needed to prevent the movable sleeve from moving upwards, so that more parts are involved, and the failure rate is high.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide another automatic injection device capable of making a sound to indicate the start of injection in view of the current state of the art.

The second technical problem to be solved by the present invention is to provide an automatic injection device that can not only ensure sound production, but also avoid breakage of a needle tube, in view of the current situation of the prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: an automatic injection device comprises a tube body with an opening at the lower end, a fixed sleeve positioned in the tube body and an injection assembly arranged in the tube body;

it is characterized by also comprising

The sounding piece comprises an annular body which is coaxial and movably arranged in the fixed sleeve and a sounding block 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.

The structure is simple, at least part of the top wall surface of the movable sleeve is a first inclined surface which is inclined along the circumferential direction of the movable sleeve from bottom to top, and the first inclined surface is the pushing part. Therefore, as long as at least part of the top wall surface of the movable sleeve is designed to be an inclined surface, the inclined surface part can be used as a pushing part, the manufacture is convenient, and the structure is simple.

Simple structure ground, location structure supports the butt face of pressing it on for the confession sound production piece on the fixed cover, and this butt face sets up and links up mutually with the spout along fixed cover circumference.

In order to prevent the sound-producing piece from rotating and separating from the abutting surface under the condition that the sound-producing piece is not pushed by the pushing part, so that the injection device is triggered by mistake, a blocking part close to the sliding groove is arranged on the abutting surface, and the wall surface of the blocking part facing to the abutting surface is designed to incline towards the direction far from the sliding groove from top to bottom; the blocking part can play a role in blocking the sounding block to rotate when the sounding block is not pushed by the pushing part, and the design of the upper inclined surface of the blocking part can ensure that the sounding block can cross the blocking part when the sounding block is pushed by the pushing part.

In order to better prevent the sounding part from rotating and separating from the abutting surface under the condition that the sounding part is not pushed by the pushing part, a blocking part close to the sliding groove is arranged on the abutting surface and comprises a vertical section and an oblique section, the oblique section is connected with the top of the vertical section, and the wall surface of the oblique section facing the abutting surface inclines towards the direction away from the sliding groove from top to bottom. The vertical section has better blocking effect on the sounding block.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the injection assembly comprises a piston pipe movably arranged in a fixed sleeve in a penetrating mode and a third elastic piece enabling the piston pipe to keep moving downwards, the piston pipe is positioned through a locking structure relative to the fixed sleeve, the annular body is sleeved on the piston pipe and drives the piston pipe to rotate under the action of the linkage structure so as to release the constraint of the locking structure, and the piston pipe can axially move relative to the sounding piece under the action of the third elastic piece after the constraint of the locking structure is released.

The locking structure can have multiple structural style, simple structure, the locking structure is including locating the lug on the piston tube outer wall and locating the card portion of supporting on the fixed cover inner wall, the lug can offset with the card portion of supporting.

The linkage structure may have various structural forms, and may have a simple structure including a guide groove slidably provided in the guide groove and a rib extending in the up-down direction, the guide groove being opened in one of the inner circumferential wall of the annular body and the outer circumferential wall of the piston tube, the rib being provided in the other of the inner circumferential wall of the annular body and the outer circumferential wall of the piston tube. The linkage structure can not only realize that the sounding block drives the piston tube to synchronously rotate, so that the piston tube is free from the constraint of the locking structure, but also can generate relative axial movement, and plays a role in guiding the relative axial movement of the sounding part and the piston tube.

In order to prevent the needle from being exposed to hurt a person after injection, the injection assembly further comprises a needle tube arranged in the tube body and a needle arranged at the bottom of the needle tube, the lower end of the piston tube is inserted in the needle tube in an axially movable mode, and the sounding block is located on a path of upward movement of the movable sleeve in a state that the lower end of the movable sleeve extends out of the tube body after injection is completed, so that the needle is hidden in the movable sleeve to prevent the needle from being exposed.

In order to prevent the movable sleeve from moving upwards after injection is finished so as to hide the needle inside, the local inner wall surface of the sliding groove is a second inclined surface which is inclined from top to bottom along the circumferential direction of the fixed sleeve, the sound generating block impacts on the second inclined surface and can generate the sound for indicating the start of injection, a limiting groove which can correspond to the sliding groove and extends along the up-down direction is arranged on the movable sleeve, the sound generating block radially penetrates through the sliding groove and is positioned in the limiting groove in a sliding manner, and one side wall of the limiting groove corresponds to the second inclined surface of the sliding groove in the state that the movable sleeve is positioned at the upper limit position so as to prevent the sound generating block from continuously sliding downwards; when the movable sleeve is located at the lower limit position, the limiting groove is located below the sliding groove, and the sounding block is located on the upward moving path of the movable sleeve. Therefore, when the movable sleeve moves upwards, the sounding block is propped against the top surface of the movable sleeve to prevent the movable sleeve from moving upwards, so that the aim of hiding the needle head in the movable sleeve can be fulfilled.

In order to prevent the sounding block from being pushed by the movable sleeve and losing the resisting effect on the movable sleeve, the sliding groove is provided with a bottom wall, a first side wall and a second side wall which are formed at two ends of the bottom wall relatively, the second inclined plane is connected with the second side wall and the bottom wall, a first stop block is formed on the first side wall, the sounding block is pressed on the bottom wall of the sliding groove and is positioned right below the first stop block in the state that the movable sleeve is positioned at the lower limit position, and the distance between the sounding block and the first stop block is smaller than the distance between the bottom of the movable sleeve and the bottom of the needle head so as to prevent the sounding block from being pushed upwards by the movable sleeve by too large distance to expose the needle head; the top of the movable sleeve is provided with a second stop block opposite to the first side wall when the movable sleeve is at the lower limit position, and the sounding block is limited between the first side wall and the second stop block to prevent the sounding block from sounding and rotating.

Compared with the prior art, the invention has the advantages that: 1. the injection device is provided with the sounding part, and the sounding part can swing under the driving of the movable sleeve to be out of the constraint of the positioning structure, so that the sounding part can rapidly move downwards to impact on the side wall of the sliding groove of the fixed sleeve and give out sound to remind a user of starting injection, the medical effect is ensured, and the reliability and the safety of using the injection device by the user are improved; 2. the piston rod is driven to unlock through the sounding part, so that a set of unlocking structures do not need to be arranged for the sounding part and the piston rod respectively, the number of involved parts of the injection device is small, and the structure is simple; in addition, although the sounding part and the piston rod are linked, the linkage structure only can control the sounding part and the piston rod to synchronously and circumferentially rotate, and the axial movement of the sounding part and the axial movement of the piston rod are independent from each other, namely the speed of the piston rod moving in the needle tube and the speed of the sounding part impacting the side wall of the sliding groove of the fixed sleeve cannot be influenced with each other, so that the piston rod can push the piston in the needle tube to move downwards at a proper speed under the action of the third elastic part to inject liquid medicine, and the damage to the needle tube caused by the quick impact of the piston rod on the piston is avoided; the sounding part can quickly impact on the side wall of the sliding groove of the fixing sleeve under the action of the first elastic part so as to generate sound which can be heard by a user.

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 (initial state);

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

FIG. 4 is the schematic view of the structure of FIG. 2 with the tube, cap and protective sheath removed;

FIG. 5 is a schematic view of the structure of the stationary sleeve, the sounding member and the piston tube shown in FIG. 4;

FIG. 6 is a schematic view of the structure of FIG. 5 in another direction;

FIG. 7 is a schematic structural view of the sounding member of FIG. 6;

FIG. 8 is an exploded view of FIG. 5;

fig. 9 is a schematic view of the pouch of fig. 5;

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

FIG. 11 is a schematic structural view of the active sheath of FIG. 4;

FIG. 12 is a cross-sectional view of FIG. 1 with the tube, cap, and protective cover removed (with the movable cover moved upward and the pushing portion contacting the sound producing block);

FIG. 13 is a schematic view of the structure corresponding to FIG. 12;

FIG. 14 is a cross-sectional view of FIG. 1 with the tube, cap and protective sheath removed (the movable sheath moving upward, the pushing portion pushing the sound block to move above the chute);

FIG. 15 is a schematic view of the structure corresponding to FIG. 14;

FIG. 16 is a cross-sectional view of FIG. 1 with the tube, cap and protective sheath removed (the sounding block hits the side wall of the chute and the piston tube pushes the piston to start injecting the liquid medicine);

FIG. 17 is a schematic view of the structure corresponding to FIG. 16;

FIG. 18 is a cross-sectional view of FIG. 1 with the tube, cap and boot removed (after the injection of the medical fluid is completed);

FIG. 19 is a schematic view of the structure corresponding to FIG. 18;

FIG. 20 is a cross-sectional view of FIG. 1 with the tube, cap, and protective sheath removed (with the active sheath moved downward for repositioning);

FIG. 21 is a schematic view of the structure corresponding to FIG. 16;

FIG. 22 shows another configuration of the stop;

fig. 23 is an enlarged view of a portion a in fig. 21.

Detailed Description

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

As shown in fig. 1 to 22, the automatic injection device of the preferred embodiment includes a tube body 1, a cap body 2, a fixed sleeve 3, a movable sleeve 4, a sound-producing component 5 and an injection assembly 6, wherein the lower end of the tube body 1 is open, the cap body 2 covers the lower end of the tube body 1, and the tube body 1 is in the shape of a pen holder and is small in size and convenient to use.

As shown in fig. 2, 3 and 4, the movable sleeve 4 is disposed in the tube body 1, the lower end of the movable sleeve 4 can extend out of the tube body 1 and move upward relative to the tube body 1 when pressed by skin, and the movable sleeve 4 always keeps a downward movement trend under the action of the second elastic member 40.

The movable sleeve 4 is sleeved on the fixed sleeve 3, the fixed sleeve 3 is positioned relative to the pipe body 1, the side wall of the movable sleeve 4 is provided with a limiting groove 41 (namely an upper opening of the limiting groove 41) which extends up and down and is sealed at the lower end, the outer wall of the fixed sleeve 3 is provided with a limiting block 33 which is slidably positioned in the limiting groove 41, the limiting block 33 is positioned below the sliding groove 32, when the bottoms of the limiting block 33 and the limiting groove 41 are abutted, the movable sleeve 4 is positioned at an upper limit position, and the movable sleeve 4 can only move axially due to the matching of the limiting groove 41 and the limiting block 33.

In addition, as shown in fig. 1 to 4, the outer wall of the region of the fixed sleeve 3 exposed outside the movable sleeve 4 is provided with a fastening leg 31, the peripheral wall of the tube body 1 is provided with a fastening groove 11 for the fastening leg 31 to be fastened therein, and the fastening leg 31 and the fastening groove 11 are matched to relatively position the fixed sleeve 3 and the tube body 1.

As shown in fig. 5, 7 and 9, the sounding element 5 includes an annular body 51 and a sounding block 52 disposed on the outer peripheral wall of the annular body 51, wherein the annular body 51 is coaxially and movably disposed in the fixing sleeve 3, and the sounding block 52 radially penetrates through the fixing sleeve 3 and is relatively positioned therebetween by a positioning structure. In this embodiment, the positioning structure is an abutting surface 301 disposed on the fixing sleeve 3, the abutting surface 301 is disposed along the circumference of the fixing sleeve 3, and the sounding block 52 is pressed against the abutting surface 301 by the first elastic member 53 and cannot move axially relative to the fixing sleeve 3.

The movable sleeve 4 is provided with a pushing portion 42, in this embodiment, a top wall surface of the movable sleeve 4 is partially a first inclined surface inclined from bottom to top along the circumferential direction of the movable sleeve 4 (as shown in fig. 4, the first inclined surface is inclined from the upper end of the right side wall of the limiting groove 41 to the right side from bottom to top), the first inclined surface is the pushing portion 42, when the movable sleeve 4 moves upward, the pushing portion 42 pushes the sounding block 52 to rotate clockwise (as viewed from the top of fig. 4), and the sounding block 52 is separated from the abutting surface 301 to get rid of the constraint of the positioning structure. The fixing sleeve 3 is provided with a sliding groove 32 engaged with the abutting surface 301, the sounding block 52 can be separated from the abutting surface 301 to move to the top of the sliding groove 32 under the action of the pushing part 42, then the sounding block 52 moves downwards in the sliding groove 32 under the action of the first elastic part 53 and can collide with the inner wall of the sliding groove 32 to make a sound, the sound prompts a user that the needle insertion is completed and the injection is started, and the specific structure of the sliding groove 32 is explained in combination with the injection assembly 6 below.

In this embodiment, the first elastic member 53 is a spring, one end of which abuts against the annular body 51, and the other end of which abuts against the positioning sleeve 35.

In order to facilitate the rotation of the sounding member 5 pushed by the movable sleeve 4, the end face of the sounding block 52 contacting with the pushing portion 42 is inclined. Of course, only the pushing portion 42 may be formed in an inclined surface shape.

As shown in fig. 9, in order to prevent the sounding element 5 from rotating and separating from the contact surface 301 without being pushed by the pushing portion 42, which may cause the injection device to be triggered by mistake, in the present embodiment, the contact surface 301 is provided with a blocking portion 302 close to the sliding groove 32, so that the blocking portion 302 functions to limit the rotation of the sounding block 52, but when the sounding block 52 is pushed by the pushing portion 42, the sounding block 52 needs to be able to pass over the blocking portion 302, so the wall surface of the blocking portion 302 facing the contact surface 301 is designed to be inclined from top to bottom in the direction away from the sliding groove 32, so that when the pushing portion 42 pushes the sounding block 52, the sounding block 52 slides along the wall surface of the blocking portion 302 facing the contact surface 301, at this time, the sounding element 5 rotates clockwise (as viewed from the top of fig. 4) and moves upward, and after the sounding block 52 moves upward to pass over the top of the blocking portion 302, the sounding block 52 continues to rotate to the top of the sliding, and then moves axially downward.

As shown in fig. 22, the stopper 302 may be designed in another structure: the blocking portion 302 includes a vertical portion 3021 and an oblique portion 3022, the oblique portion 3022 is connected to the top of the vertical portion 3021, a wall surface of the oblique portion 3022 facing the abutting surface 301 is inclined from top to bottom in a direction away from the chute 32, the sounding block 52 is pushed by the pushing portion 42 and then moves upward along the vertical portion 3021, when the sounding block 52 moves to the top of the vertical portion 3021, the sounding block 52 slides along the oblique portion 3022 under the pushing of the pushing portion 42, at this time, the sounding part 5 moves clockwise (when viewed from the top in fig. 22) and moves upward, and after the sounding block 52 moves upward to pass over the top of the blocking portion 302, the sounding block 52 continues to rotate above the chute 32 under the pushing of the pushing portion 42 and then moves downward and axially. The provision of the vertical section 3021 improves the reliability of preventing the sound block 52 from being rotated erroneously.

As shown in fig. 3, 7 and 8, the sounding member 5 and the injection unit 6 are linked by a linkage structure, and when the sounding block 52 sounds, the needle insertion is completed and the injection unit 6 starts injection. The injection assembly 6 comprises a piston tube 61, a piston 62, a piston rod 63, a third elastic element 64, a needle tube 65 and a needle 66, wherein the piston tube 61 is movably arranged in the fixing sleeve 3 in a penetrating manner, the annular body 51 of the sounding element 5 is sleeved on the piston tube 61, the top of the tube body 1 is open and provided with a positioning sleeve 35, the upper end of the piston rod 63 is connected with the positioning sleeve 35, the lower end of the piston tube 61 extends into the piston tube, the third elastic element 64 is sleeved on the piston rod 63, one end of the third elastic element abuts against the positioning sleeve 35, the other end of the third elastic element abuts against the bottom wall of the piston tube 61, and therefore the piston tube 61 keeps the.

The needle tube 65 is connected with the bottom of the fixed sleeve 3, the needle tube 65 is tightly fitted, namely fixed together, the needle tube 65 is sleeved with a fixed frame 651 (see fig. 2) for positioning the needle tube 65, the fixed frame 651 is positioned in the tube body 1, the lower end of the piston tube 61 is axially movably inserted in the needle tube 65, the piston 62 is arranged in the needle tube 65, and the needle head 66 is arranged at the bottom of the needle tube 65.

As shown in fig. 8 and 10, the piston tube 61 is positioned relative to the fixing sleeve 3 by a locking structure, in this embodiment, the locking structure includes a protrusion 611 disposed on the outer wall of the piston tube 61 and a retaining portion 34 disposed on the inner wall of the fixing sleeve 3, and in a state where the protrusion 611 is retained on the upper end surface of the retaining portion 34, the piston tube 61 cannot move axially relative to the fixing sleeve 3, i.e., injection cannot be performed.

To get rid of the locking mechanism, the piston tube 61 needs to be driven by the sounding member 5, specifically: a linkage structure is arranged between the annular body 51 of the sounding element 5 and the piston tube 61, when the sounding element 5 rotates, the piston tube 61 is driven to synchronously rotate under the action of the linkage structure, so that the convex block 611 and the clamping part 34 are separated, and then the piston tube 61 moves downwards relative to the fixed sleeve 3 under the action of the third elastic element 64 to perform needle insertion and injection.

As shown in fig. 7 and 8, in the present embodiment, the interlocking structure includes a guide groove 511 formed in the inner peripheral wall of the annular body 51 and a rib 612 formed in the outer peripheral wall of the piston tube 61, and the rib 612 extends in the vertical direction and is slidably disposed in the guide groove 511, but it is also possible to form the guide groove 511 in the outer peripheral wall of the piston tube 61 and form the rib 612 in the inner peripheral wall of the annular body 51. This linkage structure can not only make sound production piece 5 drive piston pipe 61 synchronous rotation, and after piston pipe 61 breaks away from the constraint of locking structure, can produce relative movement between sound production piece 5 and the piston pipe 61, because of piston pipe 61 moves down under the effect of third elastic component 64, can not receive the influence of sound production piece 5 rate of moving down, make sound production piece 5 strike spout 32 with sufficient speed and send sound under the effect of first elastic component 53, piston pipe 61 moves with suitable speed under the effect of third elastic component 64 and injects, can not lead to needle tubing 65 to break because of striking piston 62's speed is too fast.

Because the movable sleeve 4 can move up and down, and after the movable sleeve moves up for a certain distance, the needle head 66 can be exposed outside the tube body 1 to easily hurt the user, after the injection is completed, it is required to ensure that the movable sleeve 4 can not move up so as to hide the needle head 66 in the movable sleeve 4.

In this embodiment, a partial side wall surface of the sliding groove 32 is a second inclined surface 321 which is inclined from top to bottom along the circumferential direction of the fixed sleeve 3, the sound-emitting block 52 can generate sound when impacting on the second inclined surface 321, when the movable sleeve 4 is at the upper limit position, the limiting groove 41 corresponds to the sliding groove 32, the sound-emitting block 52 radially penetrates through the sliding groove 32 and is slidably located in the limiting groove 41, one side wall of the limiting groove 41 corresponds to the second inclined surface 321 of the sliding groove 32 to prevent the sound-emitting block 52 from continuously sliding downwards, as shown in fig. 17, that is, at this time, the sound-emitting block 52 is limited by the second inclined surface 321 and the left side wall of the limiting groove 41 together and cannot continuously move downwards; as shown in fig. 21, in a state where the injection is completed and the movable sleeve 4 is located at the lower limit position, the limiting groove 41 is located below the sliding groove 32, the limitation of the limiting groove 41 on the sounding block 52 disappears, the sounding block 52 continues to move downward along the second inclined surface 321 under the action of the first elastic member 53 until the sounding block 52 is located at the bottom of the sliding groove 32, at this time, the sounding block 52 has rotated by an angle, that is, has deviated from the limiting groove 42 in the longitudinal direction, that is, the sounding block 52 is located on the upward moving path of the movable sleeve 4, so that when the movable sleeve 4 moves upward, the sounding block 52 abuts against the top surface of the movable sleeve 4 to prevent the movable sleeve 4 from moving upward, and thus the purpose that the needle 66 is hidden in the movable sleeve 4 can be achieved.

As shown in fig. 21 and 23, in this embodiment, the chute 32 has a bottom wall 322, and a first side wall 323 and a second side wall 324 formed at two ends of the bottom wall 322, and the second inclined surface 321 connects the second side wall 324 and the bottom wall 322.

However, if a large force is applied to the movable sleeve 4, the movable sleeve 4 may push the sounding block 52 to move upward together, and the needle 66 is exposed, so for safety, the first side wall 323 is formed with a first stopper 325, and in a state where the movable sleeve 4 is located at the lower limit position, the sounding block 52 is pressed against the bottom wall of the sliding groove 32 and is located right below the first stopper 325, so that in order to facilitate the sounding block 52 to slide from the second inclined surface 321 to the bottom wall 322 without interference from the first stopper 325, a distance between the sounding block 52 and the first stopper 325 is provided, but the distance is smaller than a distance between the bottom of the movable sleeve 4 and the bottom of the needle 66, so that even if the movable sleeve 4 pushes the sounding block 52 upward, the distance is smaller than a distance between the bottom of the movable sleeve 4 and the bottom of the needle 66, and the needle 66 is still not exposed.

In addition, the top of the movable sleeve 4 is provided with a second stop 43 opposite to the first side wall 323 when the movable sleeve is at the lower limit position, the sounding block 52 is limited between the first side wall 323 and the second stop 43 to prevent the sounding block 52 from rotating when being pushed upwards by the movable sleeve 4, otherwise, the sounding block 52 rotates to be staggered with the first stop 325 in the longitudinal direction, so that the first stop 325 loses the blocking effect on the sounding block 52, and finally, the movable sleeve 4 moves upwards for an overlarge distance to expose the needle head 66.

As shown in fig. 2 and 3, the protective sheath 21 is arranged in the movable sheath 4 and surrounds the needle 66, the protective sheath 21 is connected with the cap body 2, and when the cap body 2 is pulled down, the protective sheath 21 is pulled down.

The injection device of the present embodiment works as follows:

1. the cap body 2 and the protective sleeve 21 are pulled down, at this time, as shown in fig. 3 and 4, the sounding block 52 abuts against the abutting surface 301, the convex block 611 on the outer wall of the piston tube 61 abuts against the upper end surface of the abutting part 34 of the fixed sleeve 3, and at this time, the limiting block 33 is located at the opening of the limiting groove 42;

2. the lower end of the movable sleeve 4 is pressed against the skin, the movable sleeve 4 moves upwards along the fixed sleeve 3, the pushing part 42 contacts the sounding block 52, and at the moment, as shown in fig. 12 and 13, the limiting block 33 moves downwards in the limiting groove 42;

3. the movable sleeve 4 is continuously pressed to move upwards, the pushing part 42 pushes the sounding block 52 to force the sounding block 52 to slide along the wall surface of the blocking part 302 facing the abutting surface 301, at this time, the sounding piece 5 moves upwards and simultaneously rotates clockwise (looking down from fig. 13), so that the sounding block 52 goes over the blocking part 302, in the process, the piston tube 61 synchronously rotates to separate the bump 611 and the abutting part 34, at this time, as shown in fig. 14 and 15, and the limit block 33 is located at the bottom of the limit groove 42;

4. then the sounding part 5 moves downwards rapidly under the action of the first elastic part 53, the sounding block 52 moves downwards along the sliding slot 32 on the fixed sleeve 3 and the limiting slot 41 on the movable sleeve 4, and at the same time, the piston tube 61 moves downwards under the action of the third elastic part 64, when the sounding block 52 hits the second inclined surface 321 of the sliding slot 32 to make a sound, the lower end of the piston tube 61 hits the piston 62, which indicates the start of injection, as shown in fig. 16 and 17;

5. the sounding block 52 is limited by the left sidewall of the limiting groove 41 and the second inclined surface 321 of the sliding groove 32 together and cannot move downwards continuously, the piston tube 61 continues to push the piston to move downwards under the action of the third elastic element 64, the liquid medicine below the piston 62 in the needle tube 65 is pushed out at a constant speed, and when the piston 62 moves to the bottom of the needle tube 65, the liquid medicine is completely pushed out, and the injection is completed, as shown in fig. 18 and 19;

6. after the injection is completed, the movable sleeve 4 is released to be separated from the contact with the skin, the movable sleeve 4 moves downwards along the fixed sleeve 3 under the action of the second elastic element 40, in the process that the movable sleeve 4 moves downwards, the limit of the side wall of the limiting groove 41 on the sounding block 52 gradually disappears, the sounding block 52 slides along the second inclined surface 321 of the sliding groove 32 under the action of the first elastic element 53 until being positioned at the bottom of the sliding groove 32, at the moment, the sounding block 52 is positioned on the upward moving path of the movable sleeve 4, the movable sleeve 4 cannot move upwards, and the needle head 66 is hidden in the movable sleeve 4, which is shown in fig. 20 and 21.

Claims

1. An automatic injection device comprises a tube body (1) with an opening at the lower end, a fixed sleeve (3) positioned in the tube body (1) and an injection assembly (6) arranged in the tube body (1);

it is characterized by also comprising

The sounding piece (5) comprises an annular body (51) which is coaxial and movably arranged in the fixed sleeve (3) and a sounding block (52) arranged on the outer peripheral wall of the annular body (51), wherein the sounding block (52) radially penetrates through the fixed sleeve (3) and is relatively positioned between the sounding block and the fixed sleeve through a positioning structure; the fixed sleeve (3) is provided with a sliding groove (32) for the sound production block (52) to move axially and downwards after being free from the constraint of the positioning structure, the sound production block (52) can emit sound for indicating the start of injection when impacting on the inner wall of the sliding groove (32), the sound production piece (5) is linked with the injection assembly (6) through a linkage structure, and the injection assembly (6) starts to inject when the sound production block (52) produces sound;

the movable sleeve (4) is sleeved on the fixed sleeve (3), the lower end of the movable sleeve (4) can extend out of the pipe body (1) and can move upwards relative to the fixed sleeve (3) when being pressed by skin, and a pushing part (42) which can push the sounding block (52) to move when moving upwards so as to enable the sounding block (52) to release the constraint of the positioning structure is arranged on the movable sleeve (4);

the first elastic piece (53) is arranged in the pipe body (1) and acts on the sounding piece (5) to enable the sounding piece (5) to always keep the trend of moving downwards;

the second elastic piece (40) is arranged in the pipe body (1) and acts on the movable sleeve (4) to enable the movable sleeve (4) to always keep the trend of moving downwards.

2. The automatic injection device of claim 1, wherein: the top wall surface of the movable sleeve (4) is at least partially a first inclined surface inclined along the circumferential direction of the movable sleeve (4) from bottom to top, and the first inclined surface is the pushing part (42).

3. The automatic injection device of claim 2, wherein: the positioning structure is an abutting surface (301) which is arranged on the fixed sleeve (3) and is pressed by the sounding block (52), and the abutting surface (301) is arranged along the circumferential direction of the fixed sleeve (3) and is connected with the sliding groove (32).

4. An autoinjector according to claim 3, wherein: a blocking part (302) close to the sliding groove (32) is arranged on the abutting surface (301), and the wall surface of the blocking part (302) facing to the abutting surface (301) is designed to incline from top to bottom in the direction far away from the sliding groove (32);

or a blocking part (302) close to the sliding chute (32) is arranged on the abutting surface (301), the blocking part (302) comprises a vertical section (3021) and an inclined section (3022), the inclined section (3022) is connected with the top of the vertical section (3021), and the wall surface of the inclined section (3022) facing the abutting surface (301) inclines towards the direction far away from the sliding chute (32) from top to bottom.

5. An automatic injection device according to any of claims 1-4, wherein: injection unit (6) wear to establish piston pipe (61) in fixed cover (3) and make piston pipe (61) keep third elastic component (64) of downward movement trend including the activity, piston pipe (61) are fixed a position through fixed cover (3) relatively of locking structure, ring body (51) cover is established on piston pipe (61) and is in drive piston pipe (61) rotation is in order to disengage the constraint of locking structure under linkage structure's the effect, just piston pipe (61) can be in after disengaging the constraint of locking structure relative sound producing component (5) axial displacement under the effect of third elastic component (64).

6. The automatic injection device of claim 5, wherein: the locking structure comprises a convex block (611) arranged on the outer wall of the piston pipe (61) and a clamping and abutting part (34) arranged on the inner wall of the fixing sleeve (3), and the convex block (611) can abut against the clamping and abutting part (34).

7. The automatic injection device of claim 5, wherein: the linkage structure comprises a guide groove (511) and a convex strip (612) extending along the vertical direction, the convex strip (612) is slidably arranged in the guide groove (511), the guide groove (511) is arranged on one of the inner peripheral wall of the annular body (51) and the outer peripheral wall of the piston tube (61), and the convex strip (612) is arranged on the other one of the inner peripheral wall of the annular body (51) and the outer peripheral wall of the piston tube (61).

8. The automatic injection device of claim 5, wherein: the injection assembly (6) further comprises a needle tube (65) arranged in the tube body (1) and a needle head (66) arranged at the bottom of the needle tube (65), the lower end of the piston tube (61) can be axially movably inserted into the needle tube (65), and the sounding block (52) is positioned on a path of the movable sleeve (4) moving upwards under the condition that the lower end of the movable sleeve (4) extends out of the tube body (1) after injection is completed, so that the needle head (66) is hidden in the movable sleeve (4).

9. The automatic injection device of claim 8, wherein: the inner wall of the part of the sliding groove (32) is a second inclined surface (321) which is inclined from top to bottom along the circumferential direction of the fixed sleeve (3), the sounding block (52) impacts on the second inclined surface (321) and can generate the sound for indicating the start of injection, the movable sleeve (4) is provided with a limiting groove (41) which can correspond to the sliding groove (32) and extend along the vertical direction, the sounding block (52) radially penetrates through the sliding groove (32) and is slidably positioned in the limiting groove (41), and one side wall of the limiting groove (41) corresponds to the second inclined surface (321) of the sliding groove (32) in the state that the movable sleeve (4) is positioned at the upper limit position so as to prevent the sounding block (52) from continuously sliding downwards; when the movable sleeve (4) is located at the lower limit position, the limiting groove (41) is located below the sliding groove (32), and the sounding block (52) is located on the upward moving path of the movable sleeve (4).

10. The automatic injection device of claim 9, wherein: the sliding groove (32) is provided with a bottom wall (322), a first side wall (323) and a second side wall (324) which are formed at two ends of the bottom wall (322) oppositely, the second inclined surface (321) is connected with the second side wall (324) and the bottom wall (322), a first stop block (325) is formed on the first side wall (323), the sounding block (52) is pressed against the bottom wall (322) of the sliding groove (32) and is positioned right below the first stop block (325) when the movable sleeve (4) is positioned at the lower limit position, and the distance between the sounding block (52) and the first stop block (325) is smaller than the distance between the bottom of the movable sleeve (4) and the bottom of the needle head (66); the top of the movable sleeve (4) is provided with a second stop block (43) opposite to the first side wall (323) when the movable sleeve is at the lower limit position, and the sounding block (52) is limited between the first side wall (323) and the second stop block (43).