CN113368343B

CN113368343B - Thrust mechanism, automatic injection device applying same and use method thereof

Info

Publication number: CN113368343B
Application number: CN202110577683.7A
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: 2022-06-10
Anticipated expiration: 2041-05-26
Also published as: CN113368343A; WO2022247175A1

Abstract

The invention discloses a thrust mechanism with an automatic feedback function, which comprises a push rod, a reciprocating sleeve, a return spring, a bottom cover and a sounding guide assembly, wherein the return spring is sleeved outside the reciprocating sleeve, an injection spring is arranged between the push rod and the bottom cover, the reciprocating sleeve can lock the push rod before the push rod starts to push and can retreat to release the push rod, the reciprocating sleeve and the sounding guide assembly are coaxially nested in a sliding mode, the sounding guide assembly can lock the reciprocating sleeve after the reciprocating sleeve reciprocates once, and the sounding guide assembly and the push rod act to respectively generate a start prompt sound and an end prompt sound when the push rod starts to push and stops to push. The invention also discloses an automatic injection device applying the thrust mechanism with the automatic feedback function and a using method thereof.

Description

Thrust mechanism, automatic injection device applying same and use method thereof

Technical Field

The present invention relates to a novel drug delivery device for patient self-management of diseases, and more particularly, to a thrust mechanism with an automatic feedback function, an automatic injection device using the same, and a method for using the automatic injection device.

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 it is desirable that injection devices be easy to operate, have high patient compliance, have multi-dimensional feedback, such as audio, visual, tactile, during the injection process, and that patients 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. Meanwhile, people pay more attention to the personal privacy problem, and higher requirements are put forward on miniaturization, portability and usability 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:

1. at present, 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.

2. In order to realize multi-dimensional feedback, most of related products in the market rely on electronic components to complete visual and auditory feedback, and the products still need batteries for power supply. 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.

3. At present, the operation steps of the products on the market are more, at least three steps of operation steps are often needed, the periodic use of the products by patients still has the forgetting risk, and the compliance of the patients is poor.

4. After the product uses in the existing market, often need the user to insert the spacer pin or rotate locking mechanism and realize the product auto-lock to the realization prevents secondary use and false triggering. 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 undesirable for such products.

5. Present product is in order to realize the automatic injection function, adopts structural design such as buckle on the trigger mechanism mostly, utilizes the elastic deformation completion of part to trigger, processes such as locking, and this design often needs buckle isotructure to be in the pressurized deformation state, because this type of product disposable, the part is usually by macromolecular material injection moulding, and part buckle structure pressurized is unfavorable for transportation and long-term storage, and receives the environmental impact big, and plastic deformation appears easily in this type of structure. When the product is used, the elasticity of the product is lost, so that the product cannot reach the due position, and the product fails.

6. The existing product utilizes part impact to generate sound feedback, the power source of the existing product is the same as that of injection power, the situations of blockage, uneven power distribution and the like are easily caused, the situations of overlong injection time, small feedback volume and the like can occur in the product, a patient can not master the injection process, the injection is finished in advance, liquid medicine can not be injected into the body of the patient according to the specified dosage, and therefore the curative effect is reduced.

The invention with publication number CN101678168A exclusively discloses an injection device in 210 years, 3 months and 24 days, 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 a thrust mechanism with an automatic feedback function, an automatic injection device applying the thrust mechanism and a use method thereof, aiming at overcoming the defects that the auditory feedback provided by the existing automatic injection device in the working process is lack of clear identifiability and is difficult to identify the initial and end states of injection.

The technical scheme of the invention is as follows: the utility model provides a thrust mechanism with automatic feedback function, includes the push rod, reciprocal sleeve, reset spring and bottom, reset spring cup joints outside reciprocal sleeve, is equipped with injection spring between push rod and bottom, reciprocal sleeve can lock the push rod and can retreat the release push rod before the push rod starts to impel, this thrust mechanism still includes the sound production direction subassembly, the coaxial slip nestification of push rod, reciprocal sleeve and sound production direction subassembly, sound production direction subassembly and push rod effect produce originated suggestion sound and termination suggestion sound respectively when the push rod impels to begin, when the termination. When the pushing mechanism works, the reciprocating 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 by touching the bottom, the push rod can produce sound with the sound production guide assembly at the starting end and the terminal end, and the working process of the mechanism is prompted to the user through sound feedback so as to clearly, clearly and concisely indicate the working starting and ending states of the thrust mechanism through auditory signals. The thrust 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 device, easy production and convenient use.

Preferably, the sounding guide assembly is connected in the reciprocating sleeve in a penetrating mode, the push rod is connected in the sounding guide assembly in a penetrating mode, the sounding guide assembly comprises a fixed guide sleeve, a rotating power element and a sounding ring, the fixed guide sleeve, the rotating power element and the sounding ring are coaxially nested, and the fixed guide sleeve is movably connected with the sounding ring through the rotating power element. The sounding ring can rotate around the axis of the fixed guide sleeve, and the rotating power element provides kinetic energy for the rotation of the sounding ring. The fixed guide sleeve can guide the push rod to move and change postures according to a set path, and collision among components is easy to occur in the moving and posture changing process, so that prompt sound can be obtained. The sounding ring has the functions of sounding under the interaction with the push rod and locking the reciprocating sleeve after the reciprocating sleeve reciprocates once. Therefore, the sounding guide assembly has the functions of sounding, self-locking, 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 reduction of the parts of the product is simultaneously beneficial to the improvement of the stability of the product.

Preferably, a propelling guide groove is axially formed in the fixed guide sleeve, a pair of sounding wings is arranged at the rear end of the push rod, an inclined groove capable of containing the sounding wings is formed in the rear end of the groove wall on one side of the propelling guide groove, a guide groove inclined surface facing the propelling guide groove is formed in the front end of the inclined groove, the sounding wings are slidably connected in the propelling guide groove, and the sounding wings are blocked in the inclined groove by the reciprocating sleeve before the push rod starts to propel. In an initial state, the sounding flying wings are blocked by the reciprocating sleeve and limited in the inclined plane clamping grooves and cannot enter the propelling guide grooves and slide along the propelling guide grooves, so that the push rod is locked, the axial propelling function of the push rod is shielded, and the thrust mechanism is in an inactivated state; when the reciprocating sleeve retreats, the locking of the push rod can be released, the injection spring provides forward axial propelling power for the push rod, the sounding flying wing applies pressure to the inclined surface of the guide groove, the inclined surface of the guide groove also generates a reaction force for the sounding flying wing, and the lateral component force of the reaction force can push the sounding flying wing to rotate towards the propelling guide groove to enable the sounding flying wing to enter the propelling guide groove and further slide along the propelling guide groove without obstacles, so that the push rod starts to be propelled forwards axially. At the moment of sliding into the propelling guide groove, the sounding flying wings impact the side walls of the propelling guide groove under the action of inertia to generate initial prompt sound.

Preferably, the rear end of the reciprocating sleeve is provided with an axial cantilever, the inner surface of the free end of the axial cantilever is provided with an inner stop, the outer wall of the fixed guide sleeve is provided with a strip-shaped window which penetrates through the inner cavity of the fixed guide sleeve and corresponds to the position of the propelling guide groove, and the inner stop is embedded in the strip-shaped window and the propelling guide groove and abuts against the sounding flying wing in the initial state. Under the initial state, under the state that this thrust mechanism has not been launched yet, because the blockking of interior dog, the sound production all-wing aircraft is restricted in the inclined plane draw-in groove, can't slide in the propulsion guide way to ensure the push rod keeps the position fixed, realize that the push rod starts to impel to the effect of blockking to the sound production all-wing aircraft of compound sleeve.

Preferably, the front end of the sounding flying wing is provided with a flying wing inclined plane which can be matched and attached with the guide groove inclined plane. The sounding flying wings are in surface fit with the inclined surfaces of the guide grooves, so that the continuous and stable interaction force between the sounding flying wings and the inclined surfaces of the guide grooves can be ensured.

Preferably, the inner wall of the sounding ring is provided with an inner flying wing, the outer peripheral surface of the push rod is provided with a limiting chute, the front end of the chute wall on one side of the limiting chute is provided with a sounding groove capable of accommodating the inner flying wing, the inner flying wing is embedded in the limiting chute in a matching manner before the push rod is pushed to the limit, the rotating power element is in a tensioning state at the moment, and the inner flying wing enters the sounding groove when the push rod is pushed to the limit. Before the push rod is pushed to the limit, the inner flying wing is restrained by the limiting chute, and a stable posture is kept; when the push rod is pushed to the limit, the inner flying wing reaches the position of the sounding groove, the sounding ring rotates under the action of elasticity, the inner flying wing rotates into the sounding groove and impacts the side wall of the sounding groove to generate sound, a termination prompt sound is formed, and a user is prompted to finish pushing the push rod.

Preferably, the reciprocating sleeve, the fixed guide sleeve and the sounding ring are all integrally molded injection molding pieces. The axial cantilever on the reciprocating sleeve needs to have elastic resetting capability, and an injection molding method is preferably adopted, and the elastic resetting capability can be endowed by the natural property of the plastic. The fixed guide sleeve and the sounding ring are provided with a plurality of grooves and protruding structures, and the sounding ring is more convenient to manufacture by adopting an injection molding method.

The utility model provides an use thrust mechanism's automatic injection device with automatic feedback function, includes the casing subassembly and the embedment syringe in advance that head end helmet, safety sleeve, shell and protective housing constitute, still includes the auto-lock structure, and the auto-lock structure can lock the safety sleeve after the safety sleeve reciprocates once, embedment syringe in advance with thrust mechanism with automatic feedback function locates in the cavity of casing subassembly, and thrust mechanism's output and embedment syringe in advance are connected. The head end protective cap is pulled out during the use, pastes safety sleeve in the injection position skin surface perpendicularly, presses the shell downwards, and the safety sleeve adduction, the syringe needle of embedment syringe in advance pierces the patient internal, and thrust mechanism's output power promotes embedment syringe in advance and injects the liquid medicine into the patient internal simultaneously, through sound and the compound feedback of visual identification, the suggestion patient injection process stage of locating. After the safety needle is used, the reciprocating sleeve and the safety sleeve reset and self-lock, the needle point is shielded, and medical accidents such as infection and injury caused by accidental touch of personnel are prevented. The invention provides a safe automatic injection device for realizing self family nursing administration/field first aid of a patient and reducing unnecessary medical expenditure.

Preferably, the self-locking structure is arranged on the thrust mechanism with the automatic feedback function, and comprises an anti-withdrawal stop block arranged on the sounding ring and a self-locking cantilever arranged at the front end of the reciprocating sleeve and capable of being stopped by the anti-withdrawal stop block after the reciprocating sleeve reciprocates once. Before the push rod is pushed to the limit, the anti-backing block is not positioned on the moving path of the self-locking cantilever, and the reciprocating sleeve can be overlapped with the sounding ring in a barrier-free manner; after the push rod is pushed to the limit position to complete the axial pushing work, the reciprocating sleeve is reset, the sounding ring rotates, the anti-retreating stop block is transferred to the moving path of the self-locking cantilever, and the sounding guide assembly locks the reciprocating sleeve, so that the automatic injection device is disposable and meets the safety requirement of a specific application field.

Preferably, the rear end face of the anti-back stop block is provided with a slope surface, and the slope surface faces to the end where the bottom cover is located. After the push rod is pushed to the limit, although the anti-retreat stop block is transferred to the moving path of the self-locking cantilever, the self-locking cantilever is jacked up by the lateral force formed by the decomposition of the slope when the self-locking cantilever is pressed to the anti-retreat stop block, the self-locking cantilever generates flexural deformation and turns over the anti-retreat stop block, so that the reciprocating sleeve is reset with smaller resistance, and the reciprocating sleeve is ensured to be reset more smoothly.

Preferably, the front end face of the anti-back stop block is an inner buckle barb inclined plane. After the reciprocating sleeve is reset, if the reciprocating sleeve retracts and retreats again, when the self-locking cantilever touches the inner buckle barb inclined plane, the inner buckle barb inclined plane is decomposed into lateral force to press the self-locking cantilever downwards, the self-locking cantilever cannot expand, and therefore the self-locking cantilever cannot climb over the anti-retreat stop block, and self-locking of the reciprocating sleeve after one reciprocating is reliably realized.

Alternatively, the front end face of the anti-back block is a plane perpendicular to the axis of the sounding ring. When the front end face is a plane, the self-locking cantilever can not generate lateral component force for expanding the self-locking cantilever when being touched, and can also be prevented from turning over the anti-retreat stop block, so that the self-locking of the reciprocating sleeve after one reciprocating is realized.

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 with double 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 and large, so that more space can be provided for arranging the functional structure more conveniently, and the increase of the parts can not be caused.

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 helmet passes through the hook and installs at embedment syringe front end in advance, 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 reciprocating 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 housing is provided with a liquid medicine 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.

The working method of the automatic injection device comprises the following steps:

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

step two, vertically sticking the safety sleeve on the skin surface of the injection part, pressing the shell downwards, retracting the safety sleeve into the shell towards the rear end, simultaneously driving the reciprocating sleeve to retreat and move towards the rear end, and compressing the return spring while the reciprocating sleeve moves;

with the movement of the reciprocating sleeve, when the inner stop block passes over the top surface of the sounding flying wing, the inner stop block does not stop the sounding flying wing any more, the push rod slides into the injection guide groove along the inclined plane of the guide groove under the action of energy released by the injection spring, and the sounding flying wing impacts the side wall of the injection guide groove under the action of inertia to send out a starting 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;

step five, along with the completion of the injection of the liquid medicine, the push rod is pushed to the limit, the inner sounding flying wing is separated from the limit sliding groove and enters the sounding groove, the limit sliding groove does not limit the rotation of the inner sounding flying wing any more, the sounding ring starts to rotate under the driving of the rotating power element, and the inner sounding flying wing impacts the side wall of the sounding groove to send a termination prompt sound;

after hearing the injection termination prompting sound, the user moves the safety sleeve away from the skin on the surface of the injection part, the rear end of the reciprocating sleeve moves towards the front end to reset, and meanwhile, the safety sleeve is driven to return to the initial position to continuously shield the injection needle;

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

The invention has the beneficial effects that:

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 has 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.

Each buckle structure of product is firm, avoids stress concentration to cause the part weak point to warp inefficacy. 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. 4 is a schematic view of a sound guide assembly according to the present invention;

FIG. 5a is an overall longitudinal cross-sectional view of the present invention;

FIG. 5b is a schematic longitudinal cross-sectional view of the assembly shown in FIG. 5a rotated 90;

FIG. 6a is a schematic view of a safety sleeve according to the present invention;

FIG. 6b is a cross-sectional view of a safety sleeve according to the present invention;

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

FIG. 7b is a partial schematic view of the housing of the present invention;

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

FIG. 8b is a cross-sectional view of a head end protective cap of the present invention;

FIG. 9 is a schematic view of the head end helmet of the present invention after being pulled out;

FIG. 10a is a partial schematic illustration of the invention in an unactivated state;

FIG. 10b is a schematic view of a fixed guide sleeve according to the present invention;

FIG. 10c is a cross-sectional view of the fixed guide sleeve of the present invention;

FIG. 10d is a schematic view of a push rod according to the present invention;

FIG. 10e is a front view of the push rod of the present invention;

FIG. 10f is a side view of the push rod of the present invention;

FIG. 11a is a schematic longitudinal cross-sectional view of the invention in its entirety when activated;

FIG. 11b is a partial mating view of the present invention as it is activated;

FIG. 12a is a schematic view of a state of the present invention during an injection process;

FIG. 12b is a schematic view of the partial fit of the present invention during an injection procedure;

FIG. 13a is a schematic view of the sound producing principle of the present invention when the sound producing ring is struck at the end of injection;

FIG. 13b is a schematic longitudinal cross-sectional view of the invention in its entirety at the end of injection;

FIG. 14 is a schematic view in full longitudinal section of the present invention after completion of injection into a self-locking condition;

FIG. 15 is a schematic view of a reciprocating sleeve according to the present invention;

fig. 16 is a schematic view of a sounding ring according to the present invention.

FIG. 17 is a schematic view of another construction of the safety sleeve of the present invention;

FIG. 18a is a schematic view of a housing according to the present invention;

FIG. 18b is a schematic view of the position of the locking piece on the housing of the present invention;

FIG. 19a 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. 19b 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. 19c 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. 19d is a schematic diagram 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 16, an automatic injection device includes a head end protective cap 1, a safety sleeve 3, a housing 2, a protective housing 4, a pre-filled syringe 5, a push rod 6, a reciprocating sleeve 7, a return spring 8, a sounding guide assembly 9 and a bottom cover 11, an injection spring 10 is arranged between the push rod 6 and the bottom cover 11, the head end protective cap 1, the safety sleeve 3, the housing 2 and the protective housing 4 form a housing assembly, the push rod 6, the reciprocating sleeve 7, the return spring 8, the sounding guide assembly 9 and the bottom cover 11 form a thrust mechanism with an automatic feedback function, the front end of the push rod 6, i.e. one end facing the pre-filled syringe 5, is an output end of the thrust mechanism, and the pre-filled syringe 5 and the thrust mechanism are arranged in a cavity of the housing assembly. The safety sleeve 3, the shell 2, the protective shell 4, the pre-encapsulated injector 5, the push rod 6, the reciprocating sleeve 7, the reset spring 8, the sounding guide assembly 9 and the injection spring 10 are all coaxially nested and assembled together, the safety sleeve 3 is embedded in the front end of the shell 2 in a sliding manner and is positioned behind the head end protective cap 1, the pre-encapsulated injector 5, the push rod 6, the reciprocating sleeve 7 and the sounding guide assembly 9 are arranged in a cavity formed by the head end protective cap 1, the shell 2 and the bottom cover 11, the protective shell 4 is embedded in the shell 2 and is sleeved outside the pre-encapsulated injector 5, the reset spring 8 is sleeved outside the reciprocating sleeve 7, the reciprocating sleeve 7 can lock the push rod 6 before the push rod 6 starts to push and can retreat to release the push rod 6, the reciprocating sleeve 7 and the sounding guide assembly 9 are coaxially nested in a sliding manner, the sounding guide assembly 9 can lock the reciprocating sleeve 7 after the reciprocating sleeve 7 reciprocates once, when the push rod 6 starts and stops pushing, the sounding guide assembly 9 and the push rod 6 act to respectively generate a starting prompt sound and a stopping prompt sound. The sounding guide assembly 9 is connected in the reciprocating sleeve 7 in a penetrating mode, the push rod 6 is connected in the sounding guide assembly 9 in a penetrating mode, the sounding guide assembly 9 comprises a fixed guide sleeve 91, a rotating power element 92 and a sounding ring 93, the fixed guide sleeve 91, the rotating power element 92 and the sounding ring 93 are coaxially nested, and the fixed guide sleeve 91 is movably connected with the sounding ring 93 through the rotating power element 92. The rotary power member 92 is a torsion spring, and the rotary power member 92 provides kinetic energy for the rotation of the sounding ring 93 around the fixed guide sleeve 91. The rear end of the fixed guide sleeve 91 is provided with a pair of buckles 9101 for matching with the buckle grooves on the bottom cover 11. The fixed guide sleeve 91 is internally provided with a propelling guide groove 9103 along the axial direction, the rear end of the push rod 6 is provided with a pair of sounding wings 62, the rear end of the groove wall on one side of the propelling guide groove 9103 is provided with an inclined plane clamping groove 9104 capable of containing the sounding wings 62, the front end of the inclined plane clamping groove 9104 is provided with a guide groove inclined plane 9105 facing the propelling guide groove 9103, and the sounding wings 62 are slidably connected in the propelling guide groove 9103. The rear end of the reciprocating sleeve 7 is provided with an axial cantilever 71, the inner surface of the free end of the axial cantilever 71 is provided with an inner check block 72, the outer wall of the fixed guide sleeve 91 is provided with a strip-shaped window 9102 which penetrates through the inner cavity of the fixed guide sleeve 91 and corresponds to the position of the propulsion guide groove 9103, and in an initial state, the push rod 6 is started to push the inner check block 72 to be embedded in the strip-shaped window 9102 and the propulsion guide groove 9103 and to abut against the sounding flyer 62, so that the sounding flyer 62 is blocked in the inclined plane clamping groove 9104. The front end of the sounding flying wing 62 is provided with a flying wing inclined plane 63 which can be matched and attached with the guide groove inclined plane 9105. The inner wall of the sounding ring 93 is integrally provided with an inner flying wing 9301, the outer peripheral surface of the push rod 6 is provided with a limiting sliding groove 64, the rear end of the groove wall on one side of the limiting sliding groove 64 is provided with a sounding groove 65 capable of accommodating the inner flying wing 9301, the width of the sounding groove 65 is larger than that of the limiting sliding groove 64, the push rod 6 is embedded in the limiting sliding groove 64 in a matching manner before being pushed to the limit, the rotating power element 92 is in a tensioning energy storage state, and when the push rod 6 is pushed to the limit, the inner flying wing 9301 enters the sounding groove 65. The sounding ring 93 is provided with a back stop 9302, the front end of the reciprocating sleeve 7 is provided with a self-locking cantilever 73 which can be stopped by the back stop 9302 after the reciprocating sleeve 7 reciprocates once, the back end face of the back stop 9302 is provided with a slope 933, the slope 933 faces the end of the bottom cover 11, and the front end face 924 of the back stop is an inner buckle barb slope. 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 6 is inserted into the glass tube 52 with the needle to drive the piston 54. Safety sleeve 3 includes the sleeve head and connects the long cantilever of a pair of tile form in sleeve head rear end, sleeve head and the long cantilever integrated into one piece of tile form, is equipped with the limit structure that slides between safety sleeve 3 and shell 2, and the limit structure that should slide includes integrated into one piece in the card arm 31 of the long cantilever both sides of tile form and sets firmly inner wall boss 22 on the 2 inner walls of shell, and the long cantilever of tile form is with a bulge loop terminal surface on the reciprocating sleeve 7 butt all the time. Be equipped with liquid medicine window 21 on the shell 2, still be equipped with buckle 23, buckle 23 is located the shell 2 rear end, is equipped with the buckle groove 111 with buckle 23 adaptation on the bottom 11. The reciprocating sleeve 7, the fixed guide sleeve 91 and the sounding ring 93 are all integrally molded injection molding pieces.

During assembly, the reciprocating sleeve 7 is sleeved outside the sounding guide assembly 9, the reset spring 8 is sleeved between the outer wall of the reciprocating sleeve and the bottom cover 11, the bottom cover 11 and the fixed guide sleeve 91 are fixedly connected together in a buckling mode and the like, the injection spring 10 is placed in the inner hole 61 of the push rod 6, one end of the injection spring abuts against the front end face of the inner hole, the other end of the injection spring abuts against the end face of the bottom cover 11, the push rod 6 and the injection spring 10 are pressed into the inner hole of the sounding guide assembly 9, and the bottom cover 11, the injection spring 10, the sounding guide assembly 9, the reset spring 8, the reciprocating sleeve 7 and the push rod 6 are connected into a whole in the above mode. The safety sleeve 3 is inserted into the inner hole of the shell 2, in the loading process, the clamping arm 31 of the safety sleeve 3 meets the blocking and inward shrinkage of the boss 22 on the inner wall of the shell 2, when the clamping arm 31 is turned over, the clamping arm 31 is opened and reset, the cantilever is embedded into a sliding chute between the bosses, the movement stroke of the safety sleeve 3 towards the front end is limited by the bosses, the rear end surface of the safety sleeve 3 is contacted with the front end surface of the reciprocating sleeve 7, the movement stroke of the full sleeve 3 towards the front end is determined by the movement stroke of the reciprocating sleeve 7, the head end protective cap 1 is coaxially arranged on the safety sleeve 3, the inner salient point 102 of the head end protective cap is clamped on the annular lip 32 of the safety sleeve 3, the prefilled syringe 5 is inserted into the inner hole of the protective sleeve 4 and then is inserted into the inner hole of the shell together, and is also positioned in the inner hole of the safety sleeve 3, at the moment, the claw 101 of the head end protective cap 1 is embedded into the assembly gap of the needle protective cap 51 and the glass tube 52, the assembled automatic injection component is inserted into the housing 2 along the axis of the housing, and the buckle 23 at the rear end of the housing 2 is buckled into the clamping groove 111 of the bottom cover 11, so that the whole product is assembled into a whole. At this time, the whole product is in an unfired state, and the inner stopper 72 of the reciprocating sleeve 7 is embedded in the propelling guide groove 9103 through the strip window 9102 on the propelling guide groove 9103 of the fixed guide sleeve 91; the sounding winglets 62 of the push rod 6 fall into the inclined plane clamping grooves 9104 at the rear end of the fixed guide sleeve 91, the propelling guide groove 9102 is communicated with the inclined plane clamping grooves 9104, the injection spring 10 is in an energy storage state at the moment, a thrust from the rear end to the front end is applied to the push rod 6, the winglet inclined planes 63 at the front end of the sounding winglets 62 are tightly attached to the guide groove inclined planes 9105 of the inclined plane clamping grooves 9104 under the action of the thrust, the inclined planes have a decomposition effect on the thrust, the sounding winglets 62 have a tendency of sliding down along the guide groove inclined planes 9105 to enter the propelling guide groove 9103, but due to the existence of the inner stoppers 72, the sounding winglets 62 are prevented from sliding into the propelling guide groove 9103.

the first step, 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 3, so that the fear before use is reduced;

step two, the safety sleeve 3 is vertically stuck to the skin surface of an injection part, the shell 2 is pressed downwards, the safety sleeve 3 retracts into the shell 2 towards the rear end, meanwhile, the reciprocating sleeve 7 is driven to retract and move towards the rear end, and the reciprocating sleeve 7 compresses the return spring 8 while moving;

step three, along with the movement of the reciprocating sleeve 7, when the inner stopper 72 passes over the top surface of the sounding flyer 62, the inner stopper 72 no longer blocks the sounding flyer 62, the push rod 6 slides into the injection guide groove 9103 along the inclined surface 9105 of the guide groove under the action of the energy released by the injection spring 10, and the sounding flyer 63 impacts the side wall of the injection guide groove 9103 under the action of inertia to generate a 'click' impact sound to become a starting prompt sound to prompt a user to start injection;

the push rod 6 starts to move from the rear end to the front end under the action of the injection spring 10 to drive the piston 54 to push the liquid medicine 53 forward, and a patient can observe the position condition of the piston 54 through the observation window 21 to clearly know the current injection state;

step five, along with the completion of the injection of the liquid medicine 53, the push rod 6 is pushed to the limit, the inner flying wing 9301 is separated from the limit sliding groove 64 and enters the sounding groove 65, the limit sliding groove 64 no longer limits the rotation of the inner flying wing 9301, the sounding ring 93 starts to rotate under the driving of the rotating power element 92, the inner flying wing 9301 impacts the side wall of the sounding groove 65 to make a click sound to become a termination prompt sound to prompt a user to finish the injection;

after hearing the injection termination prompting sound, the user moves the safety sleeve 3 away from the skin on the surface of the injection part, the rear end of the reciprocating sleeve 7 moves towards the front end to reset, and simultaneously drives the safety sleeve 3 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;

step seven, as the sounding ring 93 rotates by an angle when the injection is finished, the anti-retreat stopper 9302 on the sounding ring 93 is positioned on the motion path of the self-locking cantilever 73, when the reciprocating sleeve 7 resets, the self-locking cantilever 73 turns over the anti-retreat stopper 9302, the safety sleeve 3 is pressed again, the safety sleeve 3 drives the reciprocating sleeve 7 to retract and retreat, the front end surface 924 of the anti-retreat stopper is attached to the rear end surface of the self-locking cantilever 73, and the sounding ring 93 can only rotate circumferentially and cannot move linearly along the axis, so the anti-retreat stopper 9302 blocks the reciprocating sleeve 7 to retreat, the safety sleeve 3 and the reciprocating sleeve 7 are both self-locked, the product cannot be reused, and the injury caused by the fact that a person touches and uses a needle point is prevented.

Example 2:

as shown in fig. 17 to 19d, a hollow-out area is formed on the tile-shaped long cantilever, a safety sleeve self-locking cantilever 33 is arranged in the hollow-out area, a self-locking bump 34 is arranged on the safety sleeve self-locking cantilever 33, the self-locking structure is arranged on the housing assembly, the self-locking structure comprises a safety sleeve self-locking cantilever 33 arranged on the safety sleeve 2 and a locking block 24 arranged on the inner wall of the housing 3, the locking block 24 radially protrudes on the inner wall of the housing 3, the locking block 24 is integrally V-shaped, a starting side wall 241 and a resetting side wall 242 intersecting at the rear end of the locking block 24 are arranged on the locking block 24, the starting side wall 241 and the resetting side wall 242 intersect to form a locking block rear pointed point 245, and a V-shaped groove 243 is formed at the front end of the locking block 24. The starting side wall 241 and the inner wall of the shell 3 opposite to the starting side wall form a starting motion track 25; the reset side wall 242 and the inner wall of the housing 3 opposite thereto constitute a reset moving rail 26. The actuating sidewall 241 has a beginning cusp 244 at a front end thereof and the reset sidewall 242 has an ending cusp 246 at a front end thereof. The starting point 244 and the locking block rear point 245 are slightly deviated from the center line of the shell 3, and the self-locking convex point 34 is lower than the starting point 244 and higher than the locking block rear point 245 in a natural state, so that the self-locking cantilever 33 of the safety sleeve swings downwards under the guiding action of the starting point 244 when the safety sleeve 2 is assembled, the self-locking cantilever 33 of the safety sleeve elastically deforms at the moment, the self-locking convex point 34 falls into the starting motion track 25, and the self-locking convex point 34 is tightly attached to the starting side wall 241 under the action of the resetting elasticity of the self-locking cantilever 33 of the safety sleeve. The self-locking salient point 34 moves close to the starting side wall 241 in the process of the safety sleeve 2 retreating under pressure, and the self-locking salient point 34 moves close to the starting side wall 241 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 34 still clings to the starting side wall 241 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 sharp point 245 of the locking block is crossed, the self-locking cantilever 33 of the safety sleeve resets, the self-locking salient point 34 is separated from the locking block 24, and injection preparation is completed.

In the seventh step, when the release sleeve 7 is reset, the self-locking convex point 34 contacts with the inclined reset side wall 242, and along with the movement of the safety sleeve 2 to the front end, the self-locking convex point 34 moves in the reset movement track 26 in a manner of clinging to the start side wall 241 under the guiding action of the reset side wall 242, the safety sleeve self-locking cantilever 33 swings upwards under the propping action of the reset side wall 242, the safety sleeve self-locking cantilever 33 elastically deforms, when the self-locking convex points 34 move to positions beyond the front end points of the reset side walls 242, the self-locking cantilevers 33 of the safety sleeve reset, the self-locking convex points 34 cross over the terminal sharp points 246 under the action of the reset elastic force of the self-locking cantilevers 33 of the safety sleeve and fall into the V-shaped grooves 243, because the locking block 24 and the self-locking salient point 34 are overlapped at a certain distance in height, the retreating movement route of the self-locking salient point 34 is limited by the V-shaped groove 243, 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 3:

the anti-back stop front end surface 924 is a plane perpendicular to the axis of the sound ring 93. The rest is the same as example 1.

Claims

1. A thrust mechanism with an automatic feedback function comprises a push rod (6), a reciprocating sleeve (7), a return spring (8) and a bottom cover (11), wherein the return spring (8) is sleeved outside the reciprocating sleeve (7), an injection spring (10) is arranged between the push rod (6) and the bottom cover (11), the reciprocating sleeve (7) can lock the push rod (6) and can retreat to release the push rod (6) before the push rod (6) starts to push, the thrust mechanism is characterized by further comprising a sounding guide assembly (9), the push rod (6), the reciprocating sleeve (7) and the sounding guide assembly (9) are coaxially slidably nested, the sounding guide assembly (9) and the push rod (6) respectively generate starting prompt sound and stopping prompt sound when the push rod (6) starts to push and stops, the sounding guide assembly (9) is connected in the reciprocating sleeve (7) in a penetrating manner, the push rod (6) is connected in the sounding guide assembly (9), the sounding guide assembly (9) comprises a fixed guide sleeve (91), a rotating power element (92) and a sounding ring (93), the fixed guide sleeve (91), the rotating power element (92) and the sounding ring (93) are coaxially nested, the fixed guide sleeve (91) and the sounding ring (93) are movably connected through the rotating power element (92), a propelling guide groove (9103) is axially arranged in the fixed guide sleeve (91), a pair of sounding flying wings (62) are arranged at the rear end of a push rod (6), an inclined plane clamping groove (9104) capable of accommodating the sounding flying wings (62) is arranged at the rear end of one side groove wall of the propelling guide groove (9103), a guide groove inclined plane (9105) facing the propelling guide groove (9103) is arranged at the front end of the inclined plane clamping groove (9104), and the sounding flying wings (62) are slidably connected in the propelling guide groove (9103), and before the push rod (6) starts to push, the sounding flying wing (62) is blocked in the inclined plane clamping groove (9104) by the reciprocating sleeve (7).

2. The thrust mechanism with the automatic feedback function according to claim 1, wherein an axial cantilever (71) is arranged at the rear end of the reciprocating sleeve (7), an inner stop (72) is arranged on the inner surface of the free end of the axial cantilever (71), a strip-shaped window (9102) which penetrates through the inner cavity of the fixed guide sleeve (91) and corresponds to the position of the propelling guide groove (9103) is arranged on the outer wall of the fixed guide sleeve (91), and the inner stop (72) is embedded in the strip-shaped window (9102) and the propelling guide groove (9103) and abuts against the sounding flyer (62) in the initial state.

3. The thrust mechanism with automatic feedback function as claimed in claim 1, wherein the front end of the sounding flyer (62) is provided with a flyer inclined surface (63) which can be fitted with the guide groove inclined surface (9105).

4. The thrust mechanism with the automatic feedback function according to claim 1, wherein an inner flying wing (9301) is arranged on the inner wall of the sounding ring (93), a limiting sliding groove (64) is arranged on the outer circumferential surface of the push rod (6), a sounding groove (65) capable of accommodating the inner flying wing (9301) is arranged at the rear end of a groove wall on one side of the limiting sliding groove (64), the inner flying wing (9301) is embedded in the limiting sliding groove (64) in a matching manner before the push rod (6) is pushed to the limit, the rotating power element (92) is in a tensioned state, and the inner flying wing (9301) enters the sounding groove (65) when the push rod (6) is pushed to the limit.

5. The thrust mechanism with automatic feedback function according to any one of claims 1 to 4, wherein the reciprocating sleeve (7), the fixed guide sleeve (91) and the sounding ring (93) are all integrally molded parts.

6. An automatic injection device using the thrust mechanism with automatic feedback function of any claim 1 to 5, comprising a shell assembly consisting of a head end protective cap (1), a safety sleeve (3), a shell (2) and a protective shell (4), a pre-filled syringe (5) and a self-locking structure, wherein the self-locking structure can lock the safety sleeve (3) after the safety sleeve (3) reciprocates once, the automatic injection device is characterized in that the pre-filled syringe (5) and the thrust mechanism with automatic feedback function are arranged in a cavity of the shell assembly, and the output end of an axial driving mechanism is connected with the pre-filled syringe (5).

7. An autoinjector according to claim 6, wherein said self-locking mechanism is provided on said thrust mechanism with automatic feedback, said self-locking mechanism comprising a backstop (9302) provided on said sound ring (93), and a self-locking cantilever (73) provided at the front end of said reciprocating sleeve (7) and being blocked by said backstop (9302) after said reciprocating sleeve (7) reciprocates once.

8. An autoinjector according to claim 7, characterised in that the rear face of the anti-back stop (9302) is provided with a ramp face (9303), the ramp face (9303) facing the end at which the base cap (11) is located.

9. An autoinjector according to claim 7, characterised in that the anti-backstop front face (924) is an inside catch barb ramp.

10. An autoinjector according to claim 7, characterised in that the anti-backstop front face (924) is a plane perpendicular to the axis of the sound ring (93).

11. An automatic injection device according to claim 6, wherein the self-locking structure is arranged on the housing assembly, the self-locking structure comprises a safety sleeve self-locking cantilever (33) arranged on the safety sleeve (3) and a locking block (24) arranged on the housing (2), the safety sleeve self-locking cantilever (33) is provided with a self-locking convex point (34), the locking block (24) is provided with a starting side wall (241) and a resetting side wall (242) which intersect at the rear end of the locking block (24), and the front end of the locking block (24) is provided with a V-shaped groove (243).

12. The automatic injection device according to claim 6, wherein the pre-filled syringe (5) comprises a needle shield (51), a glass tube (52) with a needle, 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 (52) with the needle.

13. An autoinjector according to claim 6, characterised in that a sliding stop formation is provided between the safety sleeve (3) and the case (2).

14. An autoinjector according to any of claims 6 to 13, characterised in that the housing (2) is provided with a liquid medicament window (21).