CN113368344A

CN113368344A - Axial driving mechanism, automatic injection device and using method thereof

Info

Publication number: CN113368344A
Application number: CN202110577796.7A
Authority: CN
Inventors: 王佩儿
Original assignee: Ningbo Yishu Medical Technology Co ltd
Current assignee: Hangzhou Yishu Medical Technology Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-09-10
Anticipated expiration: 2041-05-26
Also published as: CN113368344B

Abstract

The invention discloses a visual feedback axial driving mechanism, which comprises a reset spring, a release sleeve, a push rod and a bottom cover, wherein the reset spring is sleeved outside the release sleeve, an injection spring is arranged between the push rod and the bottom cover, the axial driving mechanism also comprises a limiting sounding ring and a guide sleeve, the release sleeve, the guide sleeve and the push rod are coaxially and slidably nested, the limiting sounding ring is rotatably sleeved at the end part of the guide sleeve and rotates under the pushing of the push rod, the guide sleeve can act with the push rod to generate an initial prompting sound in the pushing process of the push rod, the limiting sounding ring can act with the guide sleeve to generate a termination prompting sound, and the limiting sounding ring respectively displays an indication mark when the push rod is pushed to start and stop. The invention also discloses an automatic injection device with double visual feedback by applying the axial driving mechanism and a working method of the automatic injection device with double visual feedback.

Description

Axial driving mechanism, automatic injection device and using method thereof

Technical Field

The present invention relates to a novel drug delivery device for patient self-management of diseases and a working method thereof, and more particularly, to a visual feedback axial driving mechanism, an automatic injection device using the visual feedback axial driving mechanism, and a working method thereof.

Background

With the explosive growth of population, urban siphon effect and increasingly scarce medical resources, the management of chronic diseases occupies a large amount of medical resources, and huge economic cost expenditure is caused. Society has raised increased demands on injection devices for self-use by patients, who desire injection devices that are as simple to operate as possible without the need for special training. The traditional injection device usually needs to be skillfully mastered in the needle insertion angle and the needle insertion depth, and the medicine injection effect is caused to be different due to the proficiency of the user. With the development of pharmaceutical technology, more and more chronic diseases are periodically administered, the injection process of the traditional injection mode is complicated, and the situation that the using steps are forgotten before the injection of a patient every time causes that the medicine cannot exert the due effect. The advent of automatic injection devices has provided an effective solution to this problem, and people want injection devices that are simple to operate, have high patient compliance, have multi-dimensional feedback such as hearing, vision, touch during the injection process, and the patient can control the entire injection process by obtaining feedback signals, reducing anxiety, and increasing confidence; meanwhile, the needle insertion depth is stable and consistent, the adjustment of a patient is not needed, and the fear of the patient caused by the exposure of the needle tip before and after injection is avoided; the injection process does not need manual injection and has reasonable injection time; after injection, the injection device also has the functions of preventing mistaken touch and/or secondary use and the like. And also put higher demands on miniaturization, portability, usability, reliability and economy of products. How to realize the functions and the performance to meet the market demand is currently paid more and more attention by engineering technicians. The following disadvantages exist in the current market for such products:

in order to realize the automatic injection function, the products adopt a motor and the like as power sources of an injection mechanism. This method requires energy consumption, high cost, complex control system, and environmental pollution due to the need of battery. The connection with various transmission mechanisms can cause the whole volume of the product to be large, and the requirements of portability and easy use cannot be realized.

In order to realize multidimensional feedback, most of the products rely on electronic components to complete visual and auditory feedback, and the products still need to be powered by batteries. If the product is used in the environment with strong electromagnetic interference, the due function of the product cannot be realized. Electronic components are easily affected by the environment, are easy to age and are not suitable for long-term storage. The stability and the reliability of the whole device are difficult to ensure when the device is used in a complex environment.

The operation steps are more, at least three steps are needed, the patient still has the forgetting risk after using the medicine periodically, and the patient compliance is poor.

4. After the product self-locking device is used, a user is often required to insert a limit pin or rotate a locking mechanism to realize product self-locking, so that secondary use and false triggering are prevented. However, under certain specific conditions, the phenomena of loss of the limiting part, forgetting operation of a patient and the like occur, so that the product cannot ensure self-locking after use. And such a design is ergonomically violated and does not conform to the design characteristics of such products.

5. The existing product can only check the position state of a piston or a push rod in a prefilled syringe through an observation window to judge whether the liquid medicine is injected completely, but the existing product can not accurately judge whether the liquid medicine is completely injected like the traditional manual injection due to various limitations. Especially, when the user cannot accurately recognize the prompt tone, the user can be caused to doubtful psychology whether the product is injected, so that anxiety psychology for using the product is aggravated, and compliance of the patient is reduced.

The invention with publication number CN101678168A is dedicated to 24/3/2010 and discloses an injection device, comprising: a housing; an actuating sleeve which is mounted so as to be movable relative to the housing and can be placed together with the rear end of the injection device into an injection position of a patient; an injection needle which in a puncturing position projects beyond the end of the rear end of the injection device and can be moved back into the interior of the injection device; a switching cam which is arranged axially fixed relative to the injection needle and engages in a blocking window in the puncturing position for preventing a retraction movement of the injection needle into the interior of the injection device; wherein the switching cam can be moved out of engagement with the locking window by means of the actuating sleeve, so that the injection needle is released for a retraction movement. However, the stop elements for audible feedback in the invention are continuously distributed, and sound is generated from the beginning of injection to the end of injection without obvious distinction, so that the patients are easy to hear and distinguish, and the injection state cannot be accurately identified.

Disclosure of Invention

The invention provides an axial driving mechanism with visual feedback and an automatic injection device applying the axial driving mechanism, which have the advantages of simple structure, low cost, convenient use, clear and obvious visual feedback, and the combination of sound feedback and visual feedback, thereby being convenient for identifying the injection state, and simultaneously providing a working method of the automatic injection device.

The technical scheme of the invention is as follows: the utility model provides an axial actuating mechanism of visual feedback, including reset spring, the release sleeve, push rod and bottom, reset spring cup joints outside the release sleeve, be equipped with injection spring between push rod and bottom, the release sleeve can lock the push rod and can retreat the release push rod before the push rod starts to impel, this axial actuating mechanism still includes spacing vocal ring and guide sleeve, the release sleeve, guide sleeve and coaxial slip nestification of push rod, spacing vocal ring rotates to cup joint at the guide sleeve tip and rotates under the promotion of push rod, guide sleeve can produce the originated suggestion sound with the push rod effect in the push rod propulsion process, spacing vocal ring can produce the termination suggestion sound with the guide sleeve effect, spacing vocal ring is at the push rod propulsion is originated, the display indicator mark respectively when terminating. When the axial driving mechanism works, the release sleeve slides backwards to release the push rod, and the push rod can be pushed to push other actuating mechanisms to work. In the process from unlocking the push rod to stopping when the push rod touches the bottom, the push rod and the guide sleeve can produce sound at the initial end, the limiting sound producing ring and the guide sleeve can produce sound at the terminal end, and the user is prompted to find the working process of the mechanism in the stage through sound feedback. In addition, the limit sounding ring can provide indication marks corresponding to the pushing starting state and the pushing ending state of the push rod, so that the starting state and the ending state of the work of the axial driving mechanism can be indicated by clear, clear and concise visual signals. The axial driving mechanism integrates main functions of releasing, propelling, prompting and the like only through simple nested combination of a series of components, can be used as a core mechanism for devices for implementing more specific operation, such as an automatic injection device and the like, can greatly simplify the structure of the device, and is beneficial to more compact and portable devices, easy to produce and convenient to use.

Preferably, the guide sleeve is penetrated in the release sleeve, the guide sleeve is provided with a first sliding groove and a second sliding groove along the axial direction, the rear end of the push rod is provided with a pair of symmetrical flying wings, the rear end of the groove wall on one side of the first sliding groove is provided with a rear caulking groove capable of accommodating the flying wings, the front end of the rear caulking groove is provided with a rear inclined surface facing the first sliding groove, the front end of the first sliding groove is communicated with the front end of the second sliding groove, the communication part is provided with a front inclined surface facing the second sliding groove, the flying wings are slidably connected in a channel formed by the first sliding groove and the second sliding groove, and the flying wings are blocked in the rear caulking groove by the release sleeve in the initial state. In an initial state, the flying wing is blocked by the release sleeve and limited in the rear caulking groove and cannot enter the first sliding groove and slide along the first sliding groove, so that the push rod is locked, the axial propelling function of the push rod is shielded, and the axial driving mechanism is in an inactivated state; when the release sleeve retreats, the locking of the push rod can be released, the injection spring provides forward axial propelling power for the push rod, the flying wing applies pressure to the rear inclined surface, the rear inclined surface also generates reaction force for the flying wing, and as the rear inclined surface faces to the first sliding groove, the lateral component force of the reaction force can push the flying wing to rotate towards the first sliding groove, so that the flying wing enters the first sliding groove, further slides along the first sliding groove without obstacle, and the push rod starts to be pushed forward axially. At the moment of sliding into the first sliding groove, due to the action of inertia, the flying wing impacts the side wall of the first sliding groove to generate an initial prompt sound. Similarly, under the action of the elastic force of the injection spring, the flying wing advances along the front inclined plane and slides into the second sliding groove, in the sliding-in process, the flying wing can drive the limit sounding ring to rotate, and the relative rotation between the limit sounding ring and the guide sleeve can generate a termination prompt sound.

Preferably, the front end of the flying wing is provided with a flying wing inclined plane which can be matched and attached with the rear inclined plane and the front inclined plane. The surface between the flying wing and the rear inclined surface is fitted, so that the interaction force between the flying wing and the rear inclined surface can be ensured to be continuous and stable.

Preferably, the guide sleeve is further provided with a push rod assembly groove, the push rod assembly groove is axially arranged on the inner wall of the guide sleeve along the guide sleeve, and the rear end of the push rod assembly groove is communicated with the rear caulking groove. The channel formed by the rear caulking groove, the first sliding groove, the second sliding groove and the front caulking groove is relatively tortuous, the operation is relatively troublesome if the flying wings reach the rear caulking groove along the channel and enter an initial state, the push rod assembly groove is a straight groove, the flying wings enter the push rod assembly groove, are pushed to the bottom, are turned by an angle and are pulled back, and the position can be achieved, so that the nesting assembly of the push rod and the guide sleeve is facilitated.

Preferably, the outer wall of the limiting sounding ring is provided with a stop boss and a self-locking cantilever with a self-locking hook, the rear end of the limiting sounding ring is provided with two elastic cantilevers, sounding teeth are arranged on the elastic cantilevers, a starting-state tooth socket and a final-state tooth socket are arranged on the guide sleeve, the sounding teeth are embedded into the starting-state tooth socket before the push rod starts to push, and the sounding teeth are embedded into the final-state tooth socket after the push rod pushes to the limit. When the flying wings are transferred from the first sliding groove to the second sliding groove, the limiting sounding ring is driven to rotate, the sounding teeth are separated from the initial tooth grooves, and the elastic cantilever deforms under stress; when the flying wing completely slides into the second sliding groove, the sounding teeth are buckled into the final tooth socket under the action of the restoring elastic force of the elastic cantilever and are knocked to generate a termination prompting sound to prompt a user that the pushing rod is pushed to finish. The limiting sounding ring has the functions of sounding, state switching, push rod injection distance limiting and the like, and integrates the related characteristics of the main performance of the product on one part, so that the parts required by product composition are greatly reduced, and the product parts are reduced and the improvement of the product stability is facilitated.

Preferably, the indication mark comprises a starting state display mark and a final state display mark, and the starting state display mark and the final state display mark are located at adjacent positions on the circumferential surface of the front end of the limiting sounding ring. The initial state display mark is used for indicating the non-starting state of the axial driving mechanism, the final state display mark is used for indicating the used state of the axial driving mechanism, and for the same observation point, the conversion from the initial state display mark to the final state display mark can be realized through the rotation of the limiting sounding ring.

Preferably, the inner wall of the limiting sounding ring is provided with an inner rib, and the inner rib is positioned on a motion track of the communicating part of the front end of the first sliding groove and the front end of the second sliding groove of the flying wing. The flying wing drives the limiting sounding ring to rotate by pushing the ribs, so that the sounding teeth are transferred into the final-state tooth socket from the initial-state tooth socket, and then termination prompt sound is generated.

As preferred, the guide sleeve front end has the lamella claw structure, including a set of lamella claw with guide sleeve integrated into one piece, the lamella claw encircles the guide sleeve axis and arranges, the annular external diameter that the lamella claw was arranged and is constituted is less than the guide sleeve external diameter, two at least lamella claw free end an organic whole are equipped with the lamella claw boss, spacing vocal ring front end inner wall is equipped with and rotates spout and horizontal muscle, the lamella claw structure is worn to link in spacing vocal ring and the interior horizontal muscle of lamella claw boss rear end face and spacing vocal ring front end offset, to spacing vocal ring axial positioning. The claw structure has radial elastic folding capability, and the limit sounding ring can be conveniently assembled on the guide sleeve. The petal claw structure has radial difference with the guide sleeve to form a step surface, and the step surface and the petal claw boss together play an axial positioning role in the limiting sounding ring to prevent the limiting sounding ring from moving along the axial direction.

Preferably, the rear end of the release sleeve is provided with an axial cantilever, the free end of the axial cantilever is provided with an inner stop block, the outer wall of the guide sleeve is provided with a strip-shaped window which penetrates through the inner cavity of the guide sleeve and corresponds to the first sliding groove, the inner stop block is embedded in the strip-shaped window and the first sliding groove in an initial state and abuts against the flying wing in a fit mode, and the front end of the release sleeve is provided with a notch and an annular bulge. In the initial state, namely the state that the axial driving mechanism is not started, the flying wing is limited in the rear caulking groove due to the blocking effect of the inner stop block and cannot slide into the first sliding groove, so that the push rod is ensured to keep fixed in position.

Preferably, the release sleeve, the limiting sounding ring and the guide sleeve are all integrally formed injection-molded parts. The axial cantilever on the release sleeve, the elastic cantilever and the claw structure on the guide sleeve all need to have elastic resetting capability, and the parts are injection molded, and the elastic resetting capability can be endowed by the natural properties of plastics.

The utility model provides an use visual feedback's axial actuating mechanism's automatic injection device that has dual visual feedback, includes the casing subassembly and the embedment syringe in advance that head end helmet, safety sleeve, shell and protective housing constitute, still includes self-locking structure, and self-locking structure can lock the safety sleeve after the safety sleeve reciprocates once, embedment syringe in advance with visual feedback's axial actuating mechanism locates in the cavity of casing subassembly, and axial actuating mechanism's output and embedment syringe in advance are connected. The head end protective cap is pulled out during the use, paste the safety sleeve perpendicularly in injection position skin surface, press the shell downwards, the safety sleeve adduction, the syringe needle of embedment syringe in advance pierces the patient internal, safety sleeve supports the release sleeve front end and promotes release sleeve backset release push rod simultaneously, and then triggers axial actuating mechanism's output power, it is internal with the liquid medicine injection patient that the embedment syringe in advance is promoted, through sound and the compound feedback of visual identification, suggestion patient injection process stage. Release sleeve, safety sleeve reset after using, spacing vocal ring locking release sleeve, and then support the safety sleeve, make this automatic injection device auto-lock, shield the needle point, realize this automatic injection device's disposable, satisfy the safety requirement of product, prevent that personnel from touching by mistake and cause medical negligence such as infection, injury. The invention provides a safe automatic injection device in order to realize self-family nursing administration/field first aid of a patient and reduce unnecessary medical expenditure. The use is equipped with multiple feedback function, can automatic switch-over product state sign along with the medicament injection progress, and the suggestion user is the present stage of injecting the process, and convenient to use person judges whether the product finishes using, promotes the patient and uses the confidence.

Preferably, the self-locking structure is arranged on the visual feedback axial driving mechanism and comprises a limiting self-locking hook arranged on the release sleeve and a self-locking cantilever arranged on the limiting sounding ring, wherein the self-locking cantilever is provided with the self-locking hook, and the limiting self-locking hook is arranged on the inner wall of the release sleeve. The limiting self-locking hook plays a limiting role before the axial driving mechanism is started, and plays a self-locking role after the axial driving mechanism is used, so that the limiting sounding ring can lock the release sleeve after the release sleeve reciprocates once. The limiting sounding ring not only has the functions of sounding, state switching, distance limiting of push rod injection and the like, but also has a self-locking function, and integrates the related features of the main performance of the product on one part, so that the parts required by product composition are greatly reduced, and the reduction of the parts of the product is simultaneously beneficial to the improvement of the stability of the product.

As an alternative, the self-locking structure is arranged on the shell assembly, the self-locking structure comprises a safety sleeve self-locking cantilever arranged on the safety sleeve and a locking block arranged on the shell, self-locking convex points are arranged on the safety sleeve self-locking cantilever, a starting side wall and a resetting side wall which are intersected at the rear end of the locking block are arranged on the locking block, and a V-shaped groove is formed in the front end of the locking block. The invention can also realize the self-locking of the automatic injection device through the interlocking between the safety sleeve and the shell. The automatic injection device is started, when the safety sleeve retreats for the first time, the self-locking salient points can closely cling to the starting side wall to move without obstacles when the safety sleeve is pressed to retreat, the self-locking salient points can closely cling to the starting side wall to move without obstacles when the safety sleeve resets, and after the safety sleeve resets, the self-locking salient points fall into the V-shaped groove to be locked, so that the path of retreating the safety sleeve again is blocked, and self-locking of the automatic injection device is completed. The axial driving mechanism capable of visual feedback has more parts, smaller size and compact structure, and sometimes, if excessive functional structures are given to the axial driving mechanism, certain manufacturing difficulty is caused; the size of the parts of the shell component is relatively simple in structure and large in size, so that more space can be provided for arranging the functional structure more conveniently, and the parts cannot be increased.

Preferably, the prefilled syringe comprises a needle head protective cap, a glass tube with a needle, an injection needle and a piston, wherein the head end protective cap is provided with a hook claw, and the hook claw is clamped between a gap between the needle head protective cap and the glass tube with the needle. The head end protective cap passes through the hook and installs at prefilled syringe front end, can effectively block that safety sleeve is triggered to start, and dismantles the convenience.

Preferably, a sliding limiting structure is arranged between the safety sleeve and the shell. Under the action of the reset spring, the safety sleeve can be pushed by the release sleeve to telescopically slide in the shell, and the sliding limiting structure can limit the safety sleeve to prevent the safety sleeve from being separated from the shell.

Preferably, the shell is provided with a liquid medicine window and an indication mark window. The liquid medicine window is used for observing the liquid medicine residual quantity and the position of the piston to know the injection process. In the process from the starting to the ending of the use of the automatic injection device, the indication mark window can be sequentially superposed with the initial state display mark and the final state display mark, thereby clearly indicating the starting and ending states of the work of the automatic injection device. The liquid medicine window and the indication mark window are combined for use to form double visual feedback, so that a user can accurately judge and identify the injection state of the automatic injection device through more visual feedback information.

The working method of the automatic injection device with double visual feedback comprises the following steps:

pulling out the head end protective cap, and taking the needle head protective cap out of the prefilled syringe;

the safety sleeve is vertically attached to the skin surface of the injection part, the shell is pressed downwards, the safety sleeve is retracted into the shell towards the rear end, meanwhile, the release sleeve is driven to retreat relative to the toothed sleeve and move towards the rear end, and the reset spring is compressed while the release sleeve moves;

with the movement of the release sleeve, the inner stop block crosses the rear end face of the push rod to avoid the flying wing, and under the action of the injection spring, the flying wing slides into the first sliding groove along the rear inclined face and impacts the side wall of the first sliding groove to send out an initial prompt sound;

the push rod starts to move from the rear end to the front end under the action of the injection spring to drive the piston to advance and inject the liquid medicine;

when the injection of the liquid medicine is finished, the push rod slides to the end of the first sliding groove, the inclined surface of the flying wing is contacted with the front inclined surface, slides to the second sliding groove under the action of the elastic force of the injection spring, and simultaneously drives the limiting sounding ring to rotate so as to separate the sounding teeth from the initial-state tooth socket, and when the flying wing completely slides into the second sliding groove, the sounding teeth are buckled into the final-state tooth socket under the action of the elastic cantilever resetting elastic force and send a termination prompt sound; meanwhile, the final state display mark is also transferred into an indication mark window; meanwhile, the flying wing is blocked by the transverse rib in the limiting sounding ring and stops moving forward continuously;

after hearing the injection termination prompting sound, the user moves the safety sleeve away from the skin on the surface of the injection part, releases the sleeve to reset, drives the safety sleeve to return to the initial position, and continues to shield the injection needle; the user can observe the final state display mark through the indication mark window and confirm the product state again;

and step seven, the automatic injection device completes self-locking, and the safety sleeve is prevented from retreating again.

The push rod undergoes two track changes in the whole injection process, the track change can generate prompt sound every time, and when the first sound utilizes the maximum elastic force state of the injection spring, the push rod moves rapidly and impacts to generate sound; when the injection is about to end, the elastic force of the injection spring is weakened, the injection spring cannot impact to produce sound by means of rapid movement, the elastic cantilever is used for deforming and producing sound, the sound size of the front sound and the sound size of the rear sound cannot be obviously changed, the stable volume range can be kept, and the prompt for a patient is facilitated.

Preferably, in the seventh step, the limiting self-locking hook is in contact with the self-locking cantilever when the release sleeve is reset, the limiting self-locking hook causes lateral bending deformation of the self-locking cantilever under the action of the elastic force of the release spring, the limiting self-locking hook crosses over the self-locking hook of the self-locking cantilever, the self-locking cantilever recovers the original shape, the self-locking cantilever blocks the retreating route of the limiting self-locking hook, and self-locking of the safety sleeve and the release sleeve is formed. Release telescopic spacing self-locking hook through the cooperation of preceding terminal surface with spacing sound production ring's backstop boss when this automatic injection device does not use, control its trend of further moving to the front end, promote the auto-lock cantilever side pendulum of spacing sound production ring when reseing and be elastic deformation, when replying to normal position, spacing sound production ring's auto-lock cantilever resumes to normal condition, spacing self-locking hook and the auto-lock cantilever's auto-locking hook interlock after reseing, when pressing syringe needle protective sleeve hard, auto-lock cantilever atress deformation trend is restricted by spacing self-locking hook, only can lose self-locking function after its complete damage. The design can ensure that the elastic force required during resetting is smaller, but the force for destroying the self-locking effect must be larger, and the product is safer and more reliable.

Alternatively, in the seventh step, when the release sleeve is reset, the self-locking convex point moves close to the starting side wall, the self-locking cantilever of the safety sleeve swings upwards under the guiding action of the reset side wall along with the movement of the safety sleeve to the front end, the self-locking cantilever of the safety sleeve elastically deforms, when the self-locking convex point moves to a position exceeding the front end point of the reset side wall, the self-locking cantilever of the safety sleeve resets, the self-locking convex point falls into the V-shaped groove, the retreating movement path of the self-locking convex point is limited by the V-shaped groove, the safety sleeve is prevented from retreating again, and the whole automatic injection device is self-locked. The step can smoothly complete the locking of the shell to the safety sleeve, and the integral self-locking of the automatic injection device is realized.

The invention has the beneficial effects that:

the product has dual visual feedback functions, and can be distinguished by the identification before and after use, so that the judgment of a user is more accurate.

This product possesses the automatic injection function, possesses sound feedback and visual feedback function simultaneously at the injection process, and the patient of being convenient for masters the injection state, reduces the fear psychology during the injection, and applicable crowd scope is big.

The product has few parts, compact structure, miniaturization realization, easy carrying, simple use steps, easy grasp by a user and good product compliance.

The product is safe and reliable, the patient can not see the needle point in the use process, the product can not be used for the second time in a self-locking way after being used, and the needle point is shielded to prevent damage caused by accidental touch.

The product can realize modular design, is convenient for sale and transportation, and reduces the waste of production cost.

The product is composed of a mechanical structure, the reliability of parts is high, the influence of environmental change on the performance of the parts is small, and the parts are not easy to age.

Drawings

FIG. 1 is a schematic view of an overall structure of the present invention;

FIG. 2 is an exploded view of a part of the present invention;

FIG. 3 is a schematic diagram of a pre-filled syringe according to the present invention;

FIG. 4a is a schematic structural diagram of a limiting sounding ring according to the present invention;

FIG. 4b is a front view of the limit sounding ring of the present invention;

FIG. 4c is a cross-sectional view of a limit tone ring of the present invention;

FIG. 4d is a schematic structural view of another view angle of the limiting sounding ring according to the present invention;

FIG. 5a is a schematic view of a release sleeve according to the present invention;

FIG. 5b is an axial view of the release sleeve of the present invention;

FIG. 5c is a front view of the release sleeve of the present invention;

FIG. 6a is a schematic view of a push rod according to the present invention;

FIG. 6b is a front view of the push rod of the present invention;

FIG. 6c is a schematic view of another embodiment of the push rod of the present invention;

FIG. 7a is a schematic view of a guide sleeve according to the present invention;

FIG. 7b is a schematic view of another embodiment of the guide sleeve of the present invention;

FIG. 7c is a cross-sectional view of a guide sleeve according to the present invention;

FIG. 7d is a schematic view of the rear end of the guide sleeve of the present invention;

FIG. 7e is a schematic view of the inner structure of the guide sleeve according to the present invention;

FIG. 8 is a schematic structural view of a head end protective cap according to the present invention;

FIG. 9a is a schematic view of a safety sleeve according to the present invention;

FIG. 9b is a cross-sectional view of a safety sleeve according to the present invention;

FIG. 10 is a schematic view of a housing according to the present invention;

FIG. 11 is an overall cross-sectional view of the present invention;

FIG. 12 is a schematic view showing the head-end protective cap according to the present invention in a pulled-out state;

FIG. 13a is a schematic structural view of the present invention in a standby state;

FIG. 13b is a schematic view of the state of the push rod sliding into the first sliding groove in the present invention;

FIG. 14 is a schematic view of an injection condition of the present invention;

FIG. 15a is a schematic view of the present invention immediately prior to completion of an injection;

FIG. 15b is a schematic diagram illustrating a process of sounding a termination prompt according to the present invention;

FIG. 15c is a schematic view of the invention at the completion of an injection;

FIG. 15d is a schematic view of the plunger position at the completion of an injection in accordance with the present invention;

FIG. 16 is a schematic view of the safety sleeve after completion of the injection and after resetting of the safety sleeve in accordance with the present invention;

fig. 17 is a schematic view of the self-locking condition of the safety sleeve and the release sleeve after completion of the injection according to the present invention.

FIG. 18 is a schematic view of another construction of the safety sleeve of the present invention;

FIG. 19a is a schematic view of a housing according to the present invention;

FIG. 19b is a schematic view of the position of the locking piece on the housing of the present invention;

FIG. 20a is a schematic view of the position of the self-locking cantilever of the safety sleeve when the automatic injection device of the present invention is not activated;

FIG. 20b is a schematic view of the position of the self-locking cantilever of the safety sleeve during the injection process of the automatic injection device of the present invention;

FIG. 20c is a schematic view of the position of the self-locking cantilever of the safety sleeve during the resetting process of the safety sleeve according to the present invention;

FIG. 20d is a schematic view of the position of the self-locking cantilever of the safety sleeve when the automatic injection device is self-locked.

Detailed Description

The invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings.

Example 1:

as shown in fig. 1 to 6b and fig. 7a to 17, an automatic injection device with dual visual feedback includes a head end protective cap 1, a safety sleeve 2, a housing 3, a protective housing 4, a pre-filled syringe 5, a return spring 6, a release sleeve 7, a limit sounding ring 8, a guide sleeve 9, a push rod 10, an injection spring 11 and a bottom cover 12, the injection spring 11 is disposed between the push rod 10 and the bottom cover 12, the head end protective cap 1, the safety sleeve 2, the housing 3 and the protective housing 4 constitute a housing assembly, the return spring 6, the release sleeve 7, the limit sounding ring 8, the guide sleeve 9, the push rod 10 and the bottom cover 12 constitute an axial driving mechanism capable of visual feedback, a front end of the push rod 10, i.e. an end facing the pre-filled syringe 5, is an output end of the axial driving mechanism, and the pre-filled syringe 5 and the axial driving mechanism are disposed in a cavity of the housing assembly. The safety sleeve 2, the shell 3, the protective shell 4, the pre-encapsulated injector 5, the reset spring 6, the release sleeve 7, the limit sounding ring 8, the guide sleeve 9, the push rod 10 and the injection spring 11 are all coaxially nested and assembled together, the safety sleeve 2 is slidably embedded in the front end of the shell 3 and is positioned behind the head end protective cap 1, the pre-encapsulated injector 5, the release sleeve 7, the limit sounding ring 8, the guide sleeve 9 and the push rod 10 are arranged in a cavity formed by the head end protective cap 1, the shell 3 and the bottom cover 12, the protective shell 4 is embedded in the shell 3 and is sleeved outside the pre-encapsulated injector 5, the reset spring 6 is sleeved outside the release sleeve 7, the guide sleeve 9 and the push rod 10 are coaxially slidably nested, the release sleeve 7 can lock the push rod 10 and can retreat to release the push rod 10 before the push rod 10 starts to push, the limit sounding ring is rotatably sleeved at the end of the guide sleeve 9 and rotates under the push rod 10, the limiting sounding ring 8 can lock the release sleeve 7 after the release sleeve 7 reciprocates once, the guide sleeve 9 can act with the push rod 10 to generate a starting prompt sound in the pushing process of the push rod 10, the limiting sounding ring 8 can act with the guide sleeve 9 to generate a stopping prompt sound, and the limiting sounding ring 8 respectively displays indication marks when the push rod 10 pushes the starting and stopping. The rear end of the guide sleeve 9 is provided with a pair of buckles 901 for matching with the buckle grooves on the bottom cover 12. The guide sleeve 9 is provided with a first sliding groove 904 and a second sliding groove 906 along the axial direction, the rear end of the push rod 10 is provided with a pair of symmetrical flying wings 1001, the rear end of the groove wall on one side of the first sliding groove 904 is provided with a rear caulking groove capable of accommodating the flying wings 1001, the front end of the rear caulking groove is provided with a rear inclined surface 903 facing the first sliding groove 904, the front end of the first sliding groove 904 is communicated with the front end of the second sliding groove 906, the communication part is provided with a front inclined surface 905 facing the second sliding groove 906, the flying wings 1001 are slidably connected in a channel formed by the first sliding groove 904 and the second sliding groove 906, and the flying wings 1001 are blocked in the rear caulking groove by the release sleeve in the initial state. The front end of the flying wing 1001 is provided with a flying wing inclined plane 1002 which can be matched and jointed with the rear inclined plane 903 and the front inclined plane 905. The guide sleeve 9 is further provided with a push rod assembly groove 907, the push rod assembly groove 907 is axially arranged on the inner wall of the guide sleeve 9 along the guide sleeve 9, the push rod assembly groove 907 is distributed with the first sliding groove 904 at intervals, and the rear end of the push rod assembly groove 907 is communicated with the rear caulking groove. The outer wall of the limit sounding ring 8 is provided with a stop boss 805 and a self-locking cantilever 806 with a self-locking hook, the self-locking hook of the self-locking cantilever 806 is provided with a self-locking hook arc surface 8061, the rear end of the limit sounding ring 8 is provided with two elastic cantilevers 802, the elastic cantilevers 802 are provided with sounding teeth 801, the guide sleeve 9 is provided with a starting tooth groove 909 and a final tooth groove 910, the sounding teeth 801 are embedded into the starting tooth groove 909 before the push rod 10 starts to push, and the sounding teeth 801 are embedded into the final tooth groove 910 after the push rod 10 pushes to the limit. The indication marks comprise initial state display marks 803 and final state display marks 804, and the initial state display marks 803 and the final state display marks 804 are located at adjacent positions on the peripheral surface of the front end of the limit sounding ring 8. The initial state display mark 803 is a green dot for indicating the non-activated state of the axial driving mechanism; the final state display mark 804 is a red dot for indicating the state of the axial driving mechanism after use. The inner wall of the limiting sounding ring 8 is integrally provided with an inner rib 807, and the inner rib 807 is positioned on the movement track of the communicating part of the front end of the first sliding groove 904 and the front end of the second sliding groove 906 of the flying wing 1001. The front end of the guide sleeve 9 is provided with a claw structure which comprises a group of four claws integrally formed with the guide sleeve 9, the claws are arranged around the axis of the guide sleeve 9, the outer diameter of the ring formed by the claw arrangement is smaller than that of the guide sleeve 9, so that the guide sleeve 9 forms two sections with different diameters, the ring formed by the claws is a small-diameter section, and the rest part is a large-diameter section. First sliding tray 904 extends to the path section from big footpath section always, second sliding tray 906 is located between two adjacent claws of path section front end, preceding inclined plane 905 is located two relative claw front ends promptly free ends, the claw free end that preceding inclined plane 905 is located still an organic whole is equipped with

claw boss

908, 8 front end inner walls of spacing vocal ring are equipped with and rotate spout 808 and horizontal muscle 809, the claw structure wears to link in spacing vocal ring 8 and claw boss 908 colludes in rotating spout 808, claw boss 908 rear end offsets with horizontal muscle 809 in the spacing vocal ring 8 front end, 8 rear end of spacing vocal ring with big, the boundary step butt of path section, spacing vocal ring 8 is therefore by axial positioning. The rear end of the release sleeve 7 is provided with an axial cantilever 702, the free end of the axial cantilever 702 is provided with an inner stop block 701, the outer wall of the guide sleeve 9 is provided with a strip window 902 which penetrates through the inner cavity of the guide sleeve 9 and corresponds to the position of the first sliding groove 904, the inner stop block 701 is embedded in the strip window 902 and the first sliding groove 904 in an initial state and abuts against the flying wing 1001 in an attaching mode, the front end of the release sleeve 7 is provided with a notch 704 and an annular protrusion 705, and the inner wall of the release sleeve 7 is provided with a limiting self-locking hook 703 with a self-locking hook inclined surface 7031. The prefilled syringe 5 comprises a needle head protective cap 51, a glass tube 52 with a needle, an injection needle 521 and a piston 54, wherein the glass tube 52 with the needle stores liquid medicine 53, the head end protective cap 1 is provided with a hook claw 101, the hook claw 101 is clamped between the gaps of the needle head protective cap 51 and the needle head 52, the piston 54 is embedded in the glass tube 52 with the needle in a sliding way and forms dynamic seal with the inner wall of the glass tube 52 with the needle, and a push rod 10 is inserted into the glass tube 52 with the needle to drive the piston 54. The safety sleeve 2 comprises a sleeve head and a pair of tile-shaped long cantilevers connected to the rear end of the sleeve head, and the sleeve head and the tile-shaped long cantilevers are integrally formed. Be equipped with the limit structure that slides between safety sleeve 2 and shell 3, this limit structure that slides includes integrated into one piece in the cantilever 201 of the long cantilever both sides of tile form and sets firmly the inner wall boss 32 on the shell 3 inner wall. The outer shell 3 is provided with a liquid medicine window 301, an indication mark window 302 and a clamping groove 303, the clamping groove 303 is positioned at the rear end of the outer shell 3, and the bottom cover 12 is provided with a clamping hook 1201 matched with the clamping groove 303. The release sleeve 7, the limiting sounding ring 8 and the guide sleeve 9 are all integrally formed injection molding parts.

When assembling, the method comprises the following steps from inside to outside in sequence: the injection spring 11, the push rod 10, the guide sleeve 9, the limiting sounding ring 8, the release sleeve 7, the return spring 6 and the bottom cover 12; wherein, the injection spring 11 is compressed in the inner hole 1003 of the push rod 10, one end of the injection spring is propped against the bottom surface of the inner hole 1003, and the other end of the injection spring is propped against the end surface of the bottom cover 12; the limiting sounding ring 8 is sleeved on the small-diameter section of the guide sleeve 9, the limiting sounding ring 8 can rotate around the axis of the limiting sounding ring but cannot axially move, and the limiting sounding ring 8 and the large-diameter section of the guide sleeve 9 are equal in outer diameter; in an initial state, the flying wing 1001 of the push rod 10 is embedded into a rear embedding groove containing a rear inclined plane 903 in an inner hole of the guide sleeve 9, and when the push rod 10 is assembled, the flying wing 1001 enters from the push rod assembling groove 907, is pushed to the bottom, is pulled back and is positioned; due to the blocking action of the inner stop 701 of the release sleeve, the flyer 1001 cannot slide into the first sliding groove 904 even under the action of the injection spring, thus ensuring the temporary position fixation of the pushrod 10; the release sleeve 7 is sleeved outside the guide sleeve 9, the reset spring 6 is sleeved outside the release sleeve 7 and compressed between the release sleeve 7 and the bottom cover 12, the limit sounding ring stop boss 805 stops the self-locking hook 703 from acting, so that the release sleeve is prevented from further moving to the front end under the action of the reset spring 6, and the release sleeve 7 can only do reciprocating linear motion within a certain interval; the whole driving mechanism is inserted into the inner hole of the outer shell 3 together in a relatively stable state, wherein the front end part of the push rod 10 extends into the inner hole of the pre-filled syringe 5 and keeps a certain distance with the piston 54, the clamping hook 1201 on the bottom cover 12 is clamped into the clamping groove 303 on the outer shell 3, the two tile-shaped long cantilevers of the safety sleeve 2 approach or contact the front end surface of the annular protrusion 705, and the product forms a whole. In the initial state, the initial state display indicator 803 can be observed through the indicator window 302, and the sounding tooth 801 is also stuck in the initial state tooth groove 909.

the first step is that the head end protective cap 1 is pulled out, the needle head protective cap 51 is taken out from the prefilled syringe 5, and the hook claw 101 on the head end protective cap is embedded in a gap between the needle head protective cap 51 on the prefilled syringe 5 and the glass tube 52 with the needle, so that the needle head protective cap 51 can be taken out while the head end protective cap 1 is pulled out, the injection needle 521 is exposed at the moment, and the user is difficult to see the injection needle due to the shielding effect of the safety sleeve 2, so that the fear before use is reduced;

step two, the safety sleeve 2 is vertically stuck on the skin surface of an injection part, the shell 3 is pressed downwards, the safety sleeve 2 retracts into the shell 3 towards the rear end, meanwhile, the release sleeve 7 is driven to retreat relative to the toothed sleeve 8 and move towards the rear end, and the reset spring 6 is compressed while the release sleeve 7 moves;

step three, along with the movement of the release sleeve 7, the inner stop block 701 passes over the rear end face of the push rod 10 and does not block the flying wing 1001 any more, under the action of the elastic force release of the injection spring 11, the flying wing 1001 slides into the first sliding groove 904 along the rear inclined face 903, the push rod 10 performs spiral-like motion combining rotation and axial movement in the process, at the moment of sliding into the first sliding groove 904, due to the action of inertia, the flying wing 1001 impacts the side wall of the first sliding groove 904 to generate a click impact sound to become a starting prompt sound, and a user is prompted to start injection;

the push rod 10 starts to move from the rear end to the front end under the action of the injection spring 11, and drives the piston 54 to advance to inject the liquid medicine 53;

step five, when the liquid medicine 53 is about to be injected, the push rod 10 slides to the end of the first sliding groove 904, namely, the front end of the first sliding groove 904 is communicated with the front end of the second sliding groove 906, the flying wing inclined surface 1002 is contacted with the front inclined surface 905, and slides to the second sliding groove 906 along the front inclined surface 905 in a spiral-like motion under the action of the elastic force of the injection spring 11, and in the sliding process, because the inner ribs 807 of the limit sounding ring 8 are positioned on the motion track of the flying wing 1001, the flying wing 1001 drives the limit sounding ring 8 to rotate by pushing the inner ribs 807. As the limit sounding ring 8 rotates, the sounding teeth 801 disengage from the initial-state toothed slots 909, and the elastic cantilever 802 is deformed under force. When the flying wing 1001 completely slides into the second sliding groove 906, the sounding tooth 801 is buckled into the final-state tooth socket 910 under the action of the restoring elastic force of the elastic cantilever 802, and the user is knocked to generate a click sound to become a termination prompt sound to prompt the user that the injection is finished; meanwhile, due to the rotation of the limit sounding ring 8, the final state display mark 804 is also transferred into the indication mark window 302; meanwhile, the flying wing 1001 is blocked by the transverse rib 809 in the limiting sounding ring 8 and cannot move forward continuously, so that the situation that the push rod 10 moves forward continuously to damage the pre-encapsulation injector 5 due to further release of the elastic force of the injection spring 11 is prevented;

step six, after hearing the injection termination prompting sound, the user moves the safety sleeve 2 away from the skin on the surface of the injection part, the rear end of the release sleeve 7 moves towards the front end to reset, and simultaneously drives the safety sleeve 2 to return to the initial position to continuously shield the injection needle 521, so that the user still cannot easily observe the injection needle 521, and the injection needle 521 cannot be seen in the whole using process. The user can still observe the final state display mark 804 through the indication mark window 302 to confirm the product state again;

step seven, in the process of stopping prompting sound emission, the limiting sound emission ring 8 rotates by an angle around the axis of the guide sleeve 9, when the release sleeve 7 is reset, the limiting self-locking hook 703 is not in contact with the stop boss 805 any more, but can be in contact with the self-locking cantilever 806 with the self-locking hook, when the limiting self-locking hook is in contact with the self-locking cantilever 806, the self-locking hook inclined surface 7031 of the limiting self-locking hook 703 is in contact with the self-locking hook arc surface 8061 on the self-locking cantilever 806, under the elastic action of the release spring 6, the limiting self-locking hook 703 bends and deforms laterally, the limiting self-locking hook 703 turns over the self-locking hook of the self-locking cantilever 806, after the turning over is completed, the limiting self-locking hook and the self-locking cantilever 806 are not in contact, and the self-locking cantilever 806 returns to the original shape. When the safety sleeve 2 is tried to be pressed again, the self-locking hook of the self-locking cantilever 806 blocks the retreating route of the limiting self-locking hook 703, so that the release sleeve 7 cannot retreat, and the self-locking of the safety sleeve 2 and the release sleeve 7 is formed.

Example 2:

as shown in FIG. 6c, the front end of the push rod 10 is provided with a pad 1004 capable of rotating around the axis of the push rod 10, the pad 1004 functions as a plane bearing, when the push rod 10 advances, the pad 1004 contacts the piston 54, the pad and the piston are kept relatively stationary, and the push rod 10 and the piston 54 rotate relatively, so that the resistance encountered during the rotation of the push rod can be reduced. The rest is the same as example 1.

Example 3:

as shown in fig. 18 to 20d, a hollow-out area is formed on the tile-shaped long cantilever, a safety sleeve self-locking cantilever 203 is arranged in the hollow-out area, a self-locking bump 204 is arranged on the safety sleeve self-locking cantilever 203, the self-locking structure is arranged on the housing assembly, the self-locking structure comprises a safety sleeve self-locking cantilever 203 arranged on the safety sleeve 2 and a locking block 304 arranged on the inner wall of the housing 3, the locking block 304 radially protrudes on the inner wall of the housing 3, the locking block 304 is integrally V-shaped, a starting sidewall 3041 and a resetting sidewall 3042 intersecting at the rear end of the locking block 304 are arranged on the locking block 304, the starting sidewall 3041 and the resetting sidewall 3042 intersect to form a locking block rear tip 3045, and a V-shaped groove 3043 is formed at the front end of the locking block 304. The starting side wall 3041 and the inner wall of the housing 3 opposite thereto form a starting motion track 305; the reset sidewall 3042 and the inner wall of the housing 3 opposite thereto form a reset moving track 306. The actuating sidewall 3041 has a starting point 3044 at the front end thereof, and the reset sidewall 3042 has a terminating point 3046 at the front end thereof. The starting point 3044 and the locking block rear point 3045 are both slightly deviated from the center line of the housing 3, and the position of the self-locking bump 204 is lower than the starting point 3044 and higher than the locking block rear point 3045 in a natural state, so that when the safety sleeve 2 is assembled, the self-locking cantilever 203 of the safety sleeve swings downward under the guiding action of the starting point 3044, at this time, the self-locking cantilever 203 of the safety sleeve deforms elastically, the self-locking bump 204 falls into the starting motion track 305, and the self-locking bump 204 clings to the starting sidewall 3041 under the action of the resetting elastic force of the self-locking cantilever 203 of the safety sleeve. The self-locking salient point 204 moves close to the starting side wall 3041 in the process of the safety sleeve 2 retreating under pressure, and the self-locking salient point 204 moves close to the starting side wall 3041 in the process of the safety sleeve 2 resetting.

In the second step, the safety sleeve 2 is vertically stuck on the skin surface of the injection part, the shell 3 is pressed downwards, the safety sleeve 2 retracts into the shell 3 towards the rear end, meanwhile, the release sleeve 7 is driven to retract and move towards the rear end, and the reset spring 6 is compressed while the release sleeve 7 moves; meanwhile, the self-locking salient point 204 still clings to the starting side wall 3041 to move towards the rear end of the automatic injection device in the process that the safety sleeve 2 is pressed to retreat, after the rear tip 3045 of the locking block is crossed, the self-locking cantilever 203 of the safety sleeve resets, the self-locking salient point 204 is separated from the locking block 304, and injection preparation is completed.

In step seven, when the release sleeve 7 is reset, the self-locking salient point 204 is in contact with the inclined reset side wall 3042, and as the safety sleeve 2 moves towards the front end, the self-locking salient point 204 moves in the reset motion track 306 in a manner of clinging to the starting side wall 3041 under the guiding action of the reset side wall 3042, the self-locking cantilever 203 of the safety sleeve swings upwards under the propping action of the reset side wall 3042, the self-locking cantilever 203 of the safety sleeve elastically deforms, when the self-locking bump 204 moves to a position beyond the front end point of the reset sidewall 3042, the self-locking cantilever 203 of the safety sleeve resets, the self-locking bump 204 is over the terminal sharp point 3046 under the action of the reset elastic force of the self-locking cantilever 203 of the safety sleeve, falls into the V-shaped groove 3043, because the locking block 304 is overlapped with the self-locking salient point 204 at a certain distance in height, the retreating movement route of the self-locking salient point 204 is limited by the V-shaped groove 3043, the safety sleeve 2 cannot retreat again, and the whole automatic injection device is self-locked.

The rest is the same as example 1.

Example 4:

a secondary rear inclined plane is additionally arranged at a position which slightly moves from the position of the rear inclined plane 903 to the front end of the guide sleeve 9, the length of the first sliding groove is correspondingly shortened and is used for connecting the rear inclined plane 903 and the secondary rear inclined plane, a middle sliding groove is additionally arranged behind the secondary rear inclined plane and is communicated with the front end of the second sliding groove. When the injection is started, the flying wing 1001 undergoes two transfers on the rear inclined plane 903 and the secondary rear inclined plane in sequence in a short time to generate two initial prompt sounds, so that the auditory prompt mode is changed to meet the requirements of different use scenes and different user groups. The rest is the same as example 1.

Example 5:

the number of final tooth slots 910 is two and the length of the front bevel 905 is correspondingly increased to accommodate the increase in the number of final tooth slots 910. Thus, when the injection is terminated, the sounding teeth 801 are engaged with the two final tooth sockets 910 successively to generate two termination prompt sounds, so that the auditory prompt mode is changed to meet the requirements of different use scenes and different user groups. The rest is the same as example 3.

Claims

1. An axial driving mechanism capable of realizing visual feedback comprises a return spring (6), a release sleeve (7), a push rod (10) and a bottom cover (12), wherein the return spring (6) is sleeved outside the release sleeve (7), an injection spring (11) is arranged between the push rod (10) and the bottom cover (12), the release sleeve (7) can lock the push rod (10) before the push rod (10) starts to push and can retreat to release the push rod (10), the axial driving mechanism is characterized by further comprising a limiting sounding ring (8) and a guide sleeve (9), the release sleeve (7), the guide sleeve (9) and the push rod (10) are coaxially slidably nested, the limiting sounding ring is rotatably sleeved at the end part of the guide sleeve (9) and rotates under the pushing of the push rod (10), the guide sleeve (9) can act with the push rod (10) to generate an initial prompting sound in the pushing process of the push rod (10), the limiting sounding ring (8) can act with the guide sleeve (9) to generate a termination prompting sound, the limiting sounding ring (8) respectively displays the indication marks when the push rod (10) starts and stops propelling.

2. The visual feedback axial driving mechanism as claimed in claim 1, wherein the guide sleeve (9) is inserted into the release sleeve (7), the guide sleeve (9) is provided with a first sliding groove (904) and a second sliding groove (906) along the axial direction, the push rod (10) is provided with a pair of flying wings (1001) at the rear end, the rear end of the groove wall at one side of the first sliding groove (904) is provided with a rear caulking groove capable of accommodating the flying wings (1001), the front end of the rear caulking groove is provided with a rear inclined surface (903) facing the first sliding groove (904), the front end of the first sliding groove (904) is communicated with the front end of the second sliding groove (906), the communicating part is provided with a front inclined surface (905) facing the second sliding groove (906), the flying wing (1001) is connected in a sliding way in a channel formed by the first sliding groove (904) and the second sliding groove (906), and the flying wing (1001) is blocked in the rear caulking groove by the release sleeve in an initial state.

3. The visual feedback axial driving mechanism as claimed in claim 2, wherein the front end of the flying wing (1001) is provided with a flying wing inclined plane (1002) which can be matched and jointed with the rear inclined plane (903) and the front inclined plane (905).

4. A visual feedback axial driving mechanism as claimed in claim 2, wherein the guide sleeve (9) is further provided with a push rod fitting groove (907), the push rod fitting groove (907) is axially formed on the inner wall of the guide sleeve (9) along the guide sleeve (9), and the rear end of the push rod fitting groove (907) is communicated with the rear caulking groove.

5. The visual feedback axial driving mechanism according to claim 2, wherein the limit sounding ring (8) is provided with a stop boss (805), the rear end of the limit sounding ring (8) is provided with an elastic cantilever (802), the elastic cantilever (802) is provided with sounding teeth (801), the guide sleeve (9) is provided with a starting tooth socket (909) and a final tooth socket (910), the sounding teeth (801) are embedded into the starting tooth socket (909) before the push rod (10) starts to push, and the sounding teeth (801) are embedded into the final tooth socket (910) after the push rod (10) is pushed to the limit.

6. A visual feedback axial drive mechanism as claimed in claim 1, wherein said indicator means comprises a start state display means (803) and a final state display means (804), and said start state display means (803) and said final state display means (804) are located at adjacent positions on the circumference of the front end of said limit sounding ring (8).

7. The visual feedback axial driving mechanism as claimed in claim 2, wherein the inner wall of the limit sounding ring (8) is provided with an inner rib (807), and the inner rib (807) is positioned on the motion track of the communicating part of the front end of the first sliding groove (904) and the front end of the second sliding groove (906) of the flying wing (1001).

8. The visual feedback axial driving mechanism as claimed in claim 1, wherein the front end of the guide sleeve (9) is provided with a claw structure, the claw structure comprises a set of claws, the claws are arranged around the axis of the guide sleeve (9), the outer diameter of an annular formed by the claw arrangement is smaller than that of the guide sleeve (9), the free ends of at least two claws are provided with claw bosses (908), the inner wall of the front end of the limit sounding ring (8) is provided with a rotating chute (808) and transverse ribs (809), the claw structure is penetrated in the limit sounding ring (8), and the claw bosses (908) axially position the limit sounding ring (8).

9. The visual feedback axial driving mechanism according to claim 2, wherein the rear end of the release sleeve (7) is provided with an axial cantilever (702), the free end of the axial cantilever (702) is provided with an inner stop block (701), the outer wall of the guide sleeve (9) is provided with a strip-shaped window (902) which penetrates through the inner cavity of the guide sleeve (9) and corresponds to the position of the first sliding groove (904), the inner stop block (701) is embedded in the strip-shaped window (902) and the first sliding groove (904) and abuts against the flying wing (1001) in the initial state, and the front end of the release sleeve (7) is provided with a notch (704) and an annular protrusion (705).

10. A visual feedback axial drive mechanism as claimed in any one of claims 1 to 9, wherein the release sleeve (7), the limit sounding ring (8) and the guide sleeve (9) are all integrally moulded parts.

11. The utility model provides an automatic injection device with dual visual feedback, includes the casing subassembly and embedment syringe (5) in advance that head end helmet (1), safety sleeve (2), shell (3) and protective housing (4) constitute, still includes self-locking structure, and self-locking structure can lock safety sleeve (2) after safety sleeve (2) reciprocate once, characterized by embedment syringe (5) in advance with but the axial actuating mechanism of visual feedback locates in the cavity of casing subassembly, axial actuating mechanism's output and embedment syringe (5) in advance are connected.

12. The automatic injection device with double visual feedback according to claim 11, wherein the self-locking structure is arranged on the axial driving mechanism with visual feedback, the self-locking structure comprises a limiting self-locking hook (703) arranged on the release sleeve (7) and a self-locking cantilever (806) arranged on the limiting sounding ring (8), the self-locking hook is arranged on the self-locking cantilever (806), and the limiting self-locking hook (703) is arranged on the inner wall of the release sleeve (7).

13. The automatic injection device with dual visual feedback according to claim 11, wherein the self-locking structure is disposed on the housing assembly, the self-locking structure comprises a safety sleeve self-locking cantilever (203) disposed on the safety sleeve (2) and a locking block (304) disposed on the housing (3), the safety sleeve self-locking cantilever (203) is provided with a self-locking protrusion (204), the locking block (304) is provided with a start sidewall (3041) and a reset sidewall (3042) intersecting with the rear end of the locking block (304), and the front end of the locking block (304) is provided with a V-shaped groove (3043).

14. The automatic injection device with dual visual feedback according to claim 11, wherein the pre-filled syringe (5) comprises a needle shield (51), a glass tube with needle (52), an injection needle (521) and a piston (54), the head end shield (1) is provided with a hook (101), and the hook (101) is clamped between the gap between the needle shield (51) and the glass tube with needle (52).

15. An autoinjector with dual visual feedback according to claim 11, characterised in that a sliding stop is provided between the safety sleeve (2) and the case (3).

16. An automatic injection device with dual visual feedback according to claim 11, characterized in that the housing (3) is provided with a liquid medicine window (301) and an indicator mark window (302).

17. A method of operating an automatic injection device with dual visual feedback according to any of claims 11 to 16, comprising the steps of:

step one, pulling out the head end protective cap (1) and taking out the needle head protective cap (51) from the pre-filled and sealed injector (5);

step two, the safety sleeve (2) is vertically attached to the skin surface of an injection part, the shell (3) is pressed downwards, the safety sleeve (2) retracts into the shell (3) towards the rear end, meanwhile, the release sleeve (7) is driven to retreat and move towards the rear end, and the reset spring (6) is compressed while the release sleeve (7) moves;

thirdly, with the movement of the release sleeve (7), the inner stop block (701) passes over the rear end face of the push rod (10) to avoid the flying wing (1001), and under the action of the injection spring (11), the flying wing (1001) slides into the first sliding groove (904) along the rear inclined plane (903) and impacts the side wall of the first sliding groove (904) to send out an initial prompt sound;

the push rod (10) starts to move from the rear end to the front end under the action of the injection spring (11) to drive the piston (54) to advance to inject the liquid medicine (53);

when the liquid medicine (53) is about to be injected, the push rod (10) slides to the end of the first sliding groove (904), the flying wing inclined plane (1002) is in contact with the front inclined plane (905), slides to the second sliding groove (906) under the action of the elastic force of the injection spring (11), and simultaneously drives the limiting sounding ring (8) to rotate, so that the sounding teeth (801) are separated from the initial-state tooth socket (909), and when the flying wing (1001) completely slides into the second sliding groove (906), the sounding teeth (801) are buckled into the final-state tooth socket (910) under the action of the restoring elastic force of the elastic cantilever (802) and send a termination prompt sound; meanwhile, the final state display identifier (804) is also transferred into the indicator identifier window (302); meanwhile, the flying wing (1001) is blocked by a transverse rib (809) in the limiting sounding ring (8) and stops moving forward continuously;

after hearing the injection termination prompt sound, the user moves the safety sleeve (2) away from the skin on the surface of the injection part, releases the sleeve (7) to reset, drives the safety sleeve (2) to return to the initial position, and continues to shield the injection needle (521); the user can observe the final state display mark (804) through the indication mark window (302) to confirm the product state again;

and step seven, the automatic injection device completes self-locking, and the safety sleeve (2) is prevented from retreating again.

18. The working method of the automatic injection device according to claim 17, wherein in the seventh step, when the release sleeve (7) is reset, the limiting self-locking hook (703) is in contact with the self-locking cantilever (806), the limiting self-locking hook (703) causes lateral bending deformation of the self-locking cantilever (806) under the elastic force of the release spring (6), the limiting self-locking hook (703) turns over the self-locking hook of the self-locking cantilever (806), the self-locking cantilever (806) restores to the original shape, and the self-locking cantilever (806) blocks the retreating route of the limiting self-locking hook (703), so that self-locking of the safety sleeve (2) and the release sleeve (7) is formed.

19. The working method of the automatic injection device according to claim 17, wherein in the seventh step, when the release sleeve (7) is reset, the self-locking convex point (204) moves close to the starting sidewall (3041), the self-locking cantilever (203) of the safety sleeve swings upwards under the guiding action of the resetting sidewall (3042) along with the movement of the safety sleeve (2) towards the front end, the self-locking cantilever (203) of the safety sleeve elastically deforms, when the self-locking convex point (204) moves to a position beyond the front end point of the resetting sidewall (3042), the self-locking cantilever (203) of the safety sleeve resets, the self-locking convex point (204) falls into the V-shaped groove (3043), the retreating movement route of the self-locking convex point (204) is limited by the V-shaped groove (3043), the safety sleeve (2) is prevented from retreating again, and the whole automatic injection device is self-locked.