CN115379869A

CN115379869A - Automatic injection device and method of use

Info

Publication number: CN115379869A
Application number: CN202080098025.3A
Authority: CN
Inventors: 黄霖; 孙灿; 孙璞
Original assignee: Suzhou Hengrui Hongyuan Medical Technology Co ltd
Current assignee: Suzhou Hengrui Hongyuan Medical Technology Co ltd
Priority date: 2020-03-05
Filing date: 2020-05-12
Publication date: 2022-11-22
Also published as: CN111282094A; CN111282094B; WO2021174669A1

Abstract

An automatic injection device consisting essentially of a powered drive assembly, a housing assembly providing external protection and a syringe (10) containing a medicament; the driving assembly comprises an outer lock sleeve (4) and a far end cover (7), wherein the outer lock sleeve and the far end cover can axially move oppositely; the energy-saving device also comprises a compressed first elastic energy storage element arranged between the outer lock sleeve (4) and the far-end cover (7), an inner lock sleeve (6) sleeved in the far-end cover (7), a push rod (5) sleeved in the inner lock sleeve (6) and penetrating through the outer lock sleeve (4), and a compressed second elastic energy storage element arranged between the push rod (5) and the far-end cover (7); when the outer lock sleeve (4) is stressed and moves relative to the far-end cover (7), the unlocking groove (405) on the outer lock sleeve (4) moves out of the protruding feature (601) of the inner lock sleeve (6) along with the outer lock sleeve, the second elastic energy storage element pushes the push rod (5), so that the protruding feature of the inner lock sleeve (6) is ejected outwards and leaves the through hole (503) of the push rod (5), and the push rod (5) is pushed to discharge the medicament in the injector (10).

Description

Automatic injection device and method of use

Technical Field

The present invention relates to medical devices, and more particularly to an automatic injection device for injecting medication into a patient and a method of using the same.

Background

Autoinjectors are used to inject a medicament into a patient, the injection typically being performed by the patient.

The automatic injector is a relatively complex device, the inner container of the existing automatic injector is an injector which meets the standard of the regulation, the injector is internally loaded with a water aqua, one end of the injector is provided with a piston which can be pushed, and the other end of the injector is provided with an injection needle. The automatic injector is used for pushing the water aqua in the injector. For reliability, auto-injectors should meet a number of constraints such as stability, safety, robustness, ease of operation, etc. of the device.

For example, to avoid accidental automatic activation of the auto-injector, the device should include a positive locking feature during transport or storage. Also, when the user wishes to use the auto-injector, the device should not be activated accidentally, but only when the user really wishes, i.e. when it is in contact with the body part where injection is desired. It is therefore important to provide a reliable start lock. On the other hand, the use of an auto-injector should not be too difficult, preventing the inability of a weak person to conveniently use the injector. In addition, to avoid the risk of injury after use of the device, the automatic injector should include a needle safety device to prevent the needle from remaining exposed after use of the device. In addition, the automatic injector itself should be developed toward integration, multiple functions and easy use to adapt to complicated and varied application scenarios.

Disclosure of Invention

The invention provides an automatic injection device and a using method thereof, which can meet various requirements in use.

The technical scheme of the invention is as follows:

an automatic injection device consisting essentially of a powered drive assembly, a housing assembly providing external protection, and an injector containing a medicament;

wherein the drive assembly comprises an outer lock sleeve and a distal end cap, the outer lock sleeve and the distal end cap being interconnected and the outer lock sleeve being axially moveable relative to the distal end cap, the distal end cap being connected to the housing assembly;

the energy-saving device also comprises a compressed first elastic energy storage element arranged between the outer lock sleeve and the far-end cover, an inner lock sleeve detachably connected to the far-end cover and sleeved in the outer lock sleeve, a push rod sleeved in the inner lock sleeve and penetrating through the outer lock sleeve, and a compressed second elastic energy storage element positioned in the push rod and arranged between the push rod and the far-end cover; wherein, the first and the second end of the pipe are connected with each other,

the outer lock sleeve is provided with an unlocking groove;

the inner lock sleeve is provided with a protrusion feature protruding inwards, and the push rod is correspondingly provided with a through hole for accommodating the protrusion feature;

when the outer lock sleeve moves relative to the far-end cover under the trigger force, the first elastic energy storage element is pressed to further store energy, the unlocking groove moves out of the protruding feature of the inner lock sleeve along with the outer lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move so as to push the medicament in the injector to be discharged.

As a preferred embodiment of the automatic injection device of the present invention, a surface of the protruding feature of the inner lock sleeve facing the distal end cap is an inclined surface that forms an angle with the pushing direction of the second elastic energy storage element, and a surface of the through hole on the push rod corresponding to the inclined surface of the protruding feature is attached to the inclined surface and is also an inclined surface.

As a preferred embodiment of the automatic injection device of the present invention, the protrusion feature is provided on a rod member, one end of the rod member is fixed to the inner lock sleeve, the other end is a free end, and an open space is provided around the rod member; one or more of the protruding feature and the lever are provided.

As a preferred embodiment of the automatic injection device of the present invention, the outer lock sleeve has a surface protrusion, and the distal end cap has a sliding groove at a corresponding position; the surface protrusion is arranged in the sliding groove at the corresponding position of the far-end cover, so that the outer lock sleeve and the far-end cover are connected with each other; and, the surface projection is axially slidable within the slide slot; the surface projection of the outer lock sleeve is closer to an end of the outer lock sleeve than the unlocking groove.

In a preferred embodiment of the automatic injection device according to the present invention, the inner lock sleeve has a distal end protrusion, the distal end cap has a distal end groove at a corresponding position, the distal end protrusion of the inner lock sleeve is correspondingly engaged with the distal end groove of the distal end cap, and one end of the inner lock sleeve is fixed to the distal end cap.

In a preferred embodiment of the automatic injection device according to the present invention, the distal end cap further has a central rod, and the second elastic energy-storing element is sleeved on the central rod, and has one end abutting on the end of the distal end cap and the other end abutting on the inner surface of the end of the push rod.

As a preferred embodiment of the automatic injection device according to the present invention, the outer surface of the outer lock casing is provided with a guide projection which cooperates with a corresponding structure of the housing assembly to restrict circumferential rotation of the outer lock casing.

As a preferred embodiment of the automatic injection device of the present invention, the distal end cap is provided with a cantilever protrusion, the cantilever protrusion is protrudingly disposed on an outer surface of the distal end cap, and the distal end cap is fixedly connected to the housing assembly through the cantilever protrusion to limit axial separation of the drive assembly and the housing assembly.

As a preferred embodiment of the automatic injection device of the present invention, the outer lock sleeve has a proximal inner hole, the drive assembly of the automatic injection device further comprises a tooth socket and a tooth ring which are sequentially disposed in the proximal inner hole of the outer lock sleeve from outside to inside, and the tooth socket is fixed on the outer lock sleeve, and the push rod passes through the tooth socket and the tooth ring; the tooth socket and the push rod are matched by a hole shaft and cannot rotate relatively; the push rod is provided with a spiral track, a sliding block bulge is arranged in an inner hole of the gear ring, and the sliding block bulge is arranged in the spiral track; the outer surface of the toothed ring is provided with an elastic arm, a circumferential toothed groove is formed in a position corresponding to an inner hole of the toothed groove, the elastic arm is tensioned in the circumferential toothed groove, and the tail end of the elastic arm is provided with a tooth poking part capable of being inserted into the circumferential toothed groove.

As a preferred embodiment of the automatic injection device of the present invention, the tooth socket has a snap feature, and correspondingly, the outer lock sleeve has a receiving groove, the shape of the snap feature is adapted to the shape of the receiving groove, the snap feature of the tooth socket is installed in the receiving groove of the outer lock sleeve, and the tooth socket is further fixed on the outer lock sleeve to prevent relative rotation.

As a preferred embodiment of the automatic injection device of the present invention, the driving assembly further comprises a reset lock sleeve, and the reset lock sleeve is sleeved in the outer lock sleeve; the reset lock sleeve comprises a reset inclined surface which can be pushed by the trigger force borne by the outer lock sleeve to further rotate the reset lock sleeve; the reset lock sleeve further comprises a reset lock sleeve, the outer lock sleeve is further provided with a reset stop corresponding to the reset lock sleeve, the reset stop is located at the near end of the reset lock sleeve after the reset lock sleeve rotates and the outer lock sleeve returns to the original position under the pushing of the first elastic energy storage element.

As a preferred embodiment of the automatic injection device of the present invention, the outer lock sleeve has a thick portion at the proximal end and a thin portion at the distal end, the reset lock sleeve includes a large diameter portion and a small diameter portion, the large diameter portion of the reset lock sleeve is disposed in the inner hole of the thick portion of the outer lock sleeve, and the small diameter portion of the reset lock sleeve is disposed in the inner hole of the thin portion of the outer lock sleeve; the small-diameter part of the reset lock sleeve is opposite to the end part of the inner lock sleeve.

In a preferred embodiment of the automatic injection device according to the present invention, the reset lock is a rod-shaped member extending in the axial direction at the edge of the large diameter portion of the reset lock sleeve, and has an outward extending portion extending in the radial direction at an end thereof.

As a preferred embodiment of the automatic injection device of the present invention, the inner surface of the outer lock sleeve is provided with a limiting strip, the bottom edge of the large diameter portion of the reset lock sleeve is provided with a corresponding slot, and the limiting strip of the outer lock sleeve is clamped in the slot of the reset lock sleeve, so as to prevent the relative rotation between the reset lock sleeve and the outer lock sleeve; and, the length of spacing strip still sets up to be able to guarantee when the lock sleeve that resets is promoted, spacing strip breaks away from the draw-in groove makes the lock sleeve that resets can for outer lock sleeve is along the rotation of circumference.

As a preferred embodiment of the automatic injection device of the present invention, the housing assembly comprises a proximal end cap, a trigger sleeve and a housing, the trigger sleeve is mounted in the inner bore of the housing from the proximal direction, the proximal end cap is mounted on the outer surface of the trigger sleeve from the proximal direction in a nested manner, the trigger sleeve is used for applying a trigger force to the outer lock sleeve and protecting the needle of the syringe after the outer lock sleeve is pushed and reset by the first elastic energy storage element.

As a preferred embodiment of the automatic injection device according to the present invention, the trigger sleeve is provided with a catch, the housing is provided with a baffle feature, and after the trigger sleeve is mounted in the housing, the catch of the trigger sleeve is restrained by the baffle feature inside the housing, preventing the trigger sleeve from falling out of the housing.

In a preferred embodiment of the automatic injection device according to the present invention, the proximal end cap is provided with a protrusion, the trigger sleeve is provided with a groove, and the protrusion of the proximal end cap is snapped into the groove of the trigger sleeve, so as to mount the proximal end cap and the trigger sleeve.

Based on the same inventive concept, the present invention also provides a method for using the automatic injection device, comprising:

applying a trigger force or a trigger signal to the outer locking sleeve to move the outer locking sleeve relative to the distal end cap while the first elastic energy storage element is further compressed;

when the unlocking groove of the outer lock sleeve moves out of the protruding feature of the inner lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move to realize feeding;

after feeding is finished, the trigger force or the trigger signal is removed, and the first elastic energy storage element pushes the outer lock sleeve to reset.

Preferably, the trigger force or trigger signal is applied through a trigger sleeve in said housing assembly.

Based on the same inventive concept, the invention also provides an automatic injection device, which mainly comprises a driving component for providing power, a shell component for providing external protection and an injector for containing medicament;

the energy-saving device also comprises a compressed first elastic energy storage element arranged between the outer lock sleeve and the far-end cover, an inner lock sleeve detachably connected to the far-end cover and sleeved in the outer lock sleeve, a push rod sleeved in the inner lock sleeve and penetrating through the outer lock sleeve, and a compressed second elastic energy storage element positioned in the push rod and arranged between the push rod and the far-end cover; wherein the content of the first and second substances,

the outer lock sleeve is provided with an unlocking groove;

the inner lock sleeve is provided with a protruding feature protruding inwards, and the push rod is correspondingly provided with a through hole for accommodating the protruding feature;

the outer lock sleeve is provided with a near-end inner hole, the driving assembly further comprises a reset lock sleeve, a tooth groove and a tooth ring which are sequentially arranged in the near-end inner hole of the outer lock sleeve from outside to inside, the tooth groove is fixed on the outer lock sleeve, and the push rod penetrates through the tooth groove and the tooth ring; the tooth socket and the push rod are matched by a hole shaft and cannot rotate relatively; the push rod is provided with a spiral track, a sliding block bulge is arranged in an inner hole of the gear ring, and the sliding block bulge is arranged in the spiral track; the outer surface of the toothed ring is provided with an elastic arm, a circumferential toothed groove is formed in a position corresponding to an inner hole of the toothed groove, the elastic arm is tensioned in the circumferential toothed groove, and the tail end of the elastic arm is provided with a tooth shifting part capable of being inserted into the circumferential toothed groove;

the reset lock sleeve comprises a reset inclined surface, the reset inclined surface can be pushed by the trigger force borne by the outer lock sleeve to further enable the reset lock sleeve to rotate, the position of the reset inclined surface is set to enable the trigger force to trigger the outer lock sleeve to move axially firstly, and then trigger the reset inclined surface to enable the reset lock sleeve to rotate after a certain distance; the reset lock sleeve further comprises a reset lock, the outer lock sleeve is further provided with a reset stop corresponding to the reset lock, and the reset stop can stop at the near end of the reset lock after the reset lock sleeve rotates and returns to the original position under the pushing of the first elastic energy storage element;

when the outer lock sleeve moves relative to the distal end cover under the trigger force, the first elastic energy storage element is pressed to further store energy, the unlocking groove moves out of the protruding feature of the inner lock sleeve along with the outer lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move so as to push the medicament in the injector to be discharged; when the push rod is fed in place, the trigger force is removed, and the first elastic energy storage element can push the outer lock sleeve to return to the original position.

Preferably, the housing assembly includes a trigger sleeve for applying a trigger force to the outer lock sleeve and the reset lock sleeve.

Based on the same inventive concept, the invention also provides a triggering, signal feedback, resetting and locking method of the automatic injection device, which comprises the following steps:

applying a trigger force or signal to the outer locking sleeve to move the outer locking sleeve relative to the distal end cap while the first elastic energy storage element is further compressed; after a predetermined time or distance, the trigger force or signal is applied to the reset lock sleeve to rotate the reset lock sleeve;

when the unlocking groove of the outer lock sleeve moves out of the protruding feature of the inner lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move to realize feeding; the push rod drives the toothed ring to rotate in the tooth groove while feeding, and the elastic arm of the toothed ring collides with the circumferential tooth groove of the tooth groove to make a sound, so that signal feedback is realized;

after the feeding is completed, the trigger force or the trigger signal is removed, the first elastic energy storage element pushes the outer lock sleeve to reset, and based on the fact that the reset lock sleeve rotates, after the outer lock sleeve resets, the reset stop is arranged outside the reset locking of the reset lock sleeve, the automatic injection device is prevented from being triggered again, and locking is achieved.

Compared with the prior art, the invention has the following beneficial effects:

1. the automatic injection device is a modularized device with a pure mechanical structure, so the automatic injection device has the inherent properties of high reliability and good stability of the mechanical structure.

2. The automatic injection device integrates various functions such as triggering, energy storage, sound feedback, resetting, locking and the like, and has a plurality of functional characteristics and perfect triggering starting and automatic transmission characteristics; according to the invention, through reasonable arrangement of a transmission structure and a scheme, the functions of releasing spring energy storage, pushing action, sounding feedback and resetting and locking after injection can be automatically completed by one-time triggering, so that the integration level of the device is greatly improved, and the complexity of the operation process is reduced; on the premise of high integration of the automatic injection device, the needle head can be automatically protected after use, and the safety requirement of the device is improved.

3. The sound production feedback function of the automatic injection device can be used as an interface for information interaction, sound is sent to the outside through specific sound feedback and tactile feedback, and the functional state of the device can be monitored by a user, so that the user can conveniently perform the next control or decision execution. The information transfer path during operation is from the device to the person and then from the person to the device. Therefore, the device has the attribute of a closed-loop system, and the safety and the reliability of the device in the operation process can be greatly improved.

4. The automatic injection device provided by the invention can be used as a multifunctional automatic injection device, can be applied to various injection occasions (such as specific subdivision fields of chronic disease treatment, emergency treatment, diagnosis and the like), and has wide clinical applicability of the technical scheme;

5. the automatic injection device provided by the invention has the functions of triggering, energy storage, sound feedback, resetting and locking, can be reasonably adapted according to different use target groups (such as colleges, scientific research units, enterprises, education systems, medical systems and the like), can be made of metal materials or polymer materials, and can be used as an automatic injection device for repeated use or disposable use.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

FIG. 1 is a diagram of an automatic injection device of an embodiment of the present invention in an original state after assembly;

FIG. 2 is an exploded view of components of an automatic injection device according to an embodiment of the present invention;

FIG. 3 is a schematic view of a three-dimensional structure of a tooth socket of an automatic injection device according to an embodiment of the present invention;

FIG. 4 is a schematic perspective view of a gear ring of an automatic injection device according to an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a reset lock sleeve of an automatic injection device according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of an outer lock sleeve of an automatic injection device according to an embodiment of the present invention;

FIG. 7 is a schematic view of one particular arrangement of the guide projections of the outer lock sleeve and the slide slots or tracks of the housing of the automatic injection device in accordance with the present invention;

FIG. 8 is a schematic perspective view of a plunger of an automatic injection device according to an embodiment of the present invention;

FIG. 9 is a schematic view of the engagement of the plunger with the toothed ring and the toothed grooves of the automatic injection device according to the embodiment of the present invention;

FIG. 10 is a schematic perspective view of an inner lock sleeve of an automatic injection device according to an embodiment of the present invention;

FIG. 11 is a perspective view of a distal end cap of an automatic injection device according to an embodiment of the present invention;

FIG. 12 is one embodiment of a structure for fixedly attaching the cantilevered tabs of the distal end cap to the housing of the automatic injection device of the present embodiment;

FIG. 13 is a schematic perspective view of a return spring of an automatic injection device according to an embodiment of the present invention;

FIG. 14 is a schematic perspective view of a feed spring of an automatic injection device according to an embodiment of the present invention;

FIG. 15 is a schematic perspective view of an injector of an automatic injection device according to an embodiment of the present invention;

FIG. 16 is a perspective view of a proximal end cap of an automatic injection device according to an embodiment of the present invention;

FIG. 17 is a schematic perspective view of a trigger sleeve of an automatic injection device according to an embodiment of the present invention;

FIG. 18 is a schematic perspective view of a housing of an automatic injection device according to an embodiment of the present invention;

FIG. 19 is a schematic cross-sectional view of a housing of an automatic injection device according to an embodiment of the present invention;

FIG. 20 is a cross-sectional axial view of an automatic injection device in an initial state in accordance with an embodiment of the present invention;

FIG. 21 is an axial cross-sectional view of the drive assembly A of the automatic injection device of an embodiment of the present invention in a home position;

FIG. 22 is an axial cross-sectional view of the housing assembly B of the automatic injection device of an embodiment of the present invention in a primed state;

FIG. 23 is a cross-sectional view of a syringe C of the automatic injection device of the present invention;

FIG. 24 is a cross-sectional view of an automatic injection device of an embodiment of the present invention in its initial state, and FIG. 24 is rotated 90 degrees about the axial direction as compared to FIG. 20;

FIGS. 25a and 25b are schematic views showing the specific fitting relationship between the plunger and the rack and the toothed groove of the automatic injection device according to the embodiment of the present invention, wherein FIG. 25a is a schematic view showing the external installation state of the audible feedback, and FIG. 25b is a schematic view showing the internal installation state of the audible feedback;

FIG. 26a is a front view and FIG. 26b is a perspective view of a plunger of an automatic injection device, particularly highlighting the symmetrical helical tracks of the outer surface, in accordance with an embodiment of the present invention;

FIG. 27 is a schematic view, in half section, of a triggering process of an automatic injection device according to an embodiment of the present invention;

FIG. 28 is a cross-sectional view of an initial state of triggering of the automatic injection device of an embodiment of the present invention;

FIG. 29 is a cross-sectional view of an automatic injection device in an activated state according to an embodiment of the present invention;

FIG. 30 is a cross-sectional view of a feeding state of the automatic injection device of the present invention;

FIG. 31 is a cross-sectional schematic view of an end-of-feed condition of an automatic injection device in accordance with an embodiment of the present invention;

FIG. 32 is a schematic view of the drive assembly A feeding state of the automatic injection device of the present invention;

fig. 33a is a diagram illustrating an acoustic feedback original position of the automatic injection device according to the embodiment of the present invention, and fig. 33b is a diagram illustrating an acoustic feedback execution state of the automatic injection device, in which only three parts of the tooth socket 1, the tooth ring 2, and the plunger 5 are shown, and other parts are not shown;

FIGS. 34a-34 e are views illustrating the triggered rotation of the reset lock in the triggered state of the automatic injection device according to the present invention, wherein FIGS. 34a-34c show the trigger force and the position of the reset lock in a time sequence, and FIGS. 34d and 34e show the initial position and the post-trigger position of the reset lock, respectively;

FIGS. 35 a-35 c are schematic diagrams of the reset and lock functions of the automatic injection device in the initial state, the triggered state and the final state according to the embodiment of the present invention;

FIGS. 36 a-36 c are schematic views of the relative positions of the outer lock sleeve and the reset lock sleeve of an automatic injection device of an embodiment of the present invention in a home state, a trigger state and an end state;

FIGS. 37 a-37 c are schematic views of the relative positions of the reset lockout and the reset stop of an automatic injection device of an embodiment of the present invention in a home state, a trigger state, and an end state;

fig. 38 a-38 c are schematic views illustrating the process of elastic deformation of the reset lock of the automatic injection device according to the embodiment of the present invention.

Detailed Description

The invention provides an automatic injection device which can be used for automatically pushing an aqueous solution in a container of the device after being triggered, wherein the aqueous solution can be used for injection. The present invention also relates to a configuration and/or assembly method for an automatic injection device configured to combine the trigger, energy storage, audible feedback, reset, and lockout functions. The automatic injection device is mainly applied to the field of medical instruments and equipment and aims at the use occasions of self-injection treatment or other-person auxiliary injection treatment. The invention designs the automatic injection device which can be automatically triggered, automatically executes the pushing action after being triggered and can be automatically reset and automatically locked after the pushing action is finished by reasonably configuring each transmission part on the transmission assembly of the automatic injection device and comprising structural characteristics arranged on each transmission part. Meanwhile, aiming at the requirements of different use occasions, the sounding feedback mechanism and/or the sounding feedback structural characteristics can be flexibly arranged in the automatic injection device, the device can adjust the sounding size and the sounding response interval, the sounding feedback function of the automatic injection device is further expanded, and the automatic injection device is suitable for various operation scenes.

The existing automatic injection device mainly refers to automatic realization of pushing action, spring force is released and acts on a push rod by releasing a spring compressed in the injection device, and the push rod conveys a water aqua in the injection device to the outside of the automatic injection device or a human body/animal body through a syringe needle by a pushing piston.

The above description is the main function of the automatic injection device, but the application scenario of the automatic injection device is complicated and varied, and the automatic injection device itself should be developed toward integration, multifunction and easy operation to adapt to the complicated and varied application scenario.

For example, for emergency situations where emergency use is required, it is desirable to minimize the operational flow. A typical automatic injection device requires a process of removing the needle guard, aligning the injection site, triggering a push button injection, and removing the injection site. The complicated procedure may cause the patient to miss the optimal rescue time. Therefore, it is necessary to expand the automation characteristics of the automatic injection device, perform time sequence combing for more distributed operation processes, and integrate multiple functions into the same device as much as possible, so that the function points of the automatic injection device can be more integrated, and in the face of emergency, the operation complexity is reduced as much as possible, and all automatic injection functions can be completed through one-step or two-step operation processes as much as possible.

As another example, for patients requiring long-term treatment and having poor perception, more operational cues are often required to inform the operational status of the automatic injection device during use of the automatic injection device. Since the general operation indication is to visually distinguish different states before and after use, it is necessary to expand the functional characteristics and add an audible or tactile indication.

For example, the safety of the device also needs to be considered in combination with the automation characteristics, so that the function of preventing accidental touch before use is ensured, and the injection needle at the end part of the syringe can be protected by the device after use to avoid injury to human bodies.

In response to the above needs, the present invention provides an automatic injection device.

The automatic injection device provided by the invention can independently complete the time sequence combination function of combining triggering, energy storage, sound feedback, resetting and locking, can automatically complete the functions of releasing spring energy storage, pushing action, sound feedback and resetting and locking after injection by one-time triggering through reasonably arranging a transmission structure and a transmission scheme, greatly improves the integration level of the device, reduces the complexity of the operation process, can realize automatic protection of a used needle head on the premise of high integration level of the automatic injection device, and improves the safety requirement of the device, so that the automatic injection device has real more comprehensive automatic significance.

The invention also extends the audible feedback function of the automatic injection device. In the production process, the sounding feedback function of the injection device in the use process can be further enriched and diversified by adjusting the sizes of the structural parts related to the sounding size and the response interval.

The automatic injection device adopts a nested design in structure, the integration level of the combination of parts is high, and when the automatic injection device needs to be produced in large quantities in the face of market demands, the production cost can be greatly reduced by using high polymer materials. The advantages of large production batch and low cost of the high polymer device are combined, the device can be expanded from a repeated use occasion to a disposable use occasion, the automatic injection device is ensured to be frequently used and new, and the stability in the service cycle of the device is improved.

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

The present embodiment relates to an automatic injection device configured to combine the functions of triggering, resetting, locking, energy storage, audible feedback, etc., the device being assembled in the original state as shown in fig. 1. An exploded view of the components of the automatic injection device is shown in fig. 2.

As can be seen in fig. 2, the automatic injection device comprises the following components:

a tooth socket 1;

a toothed ring 2;

resetting the lock sleeve 3;

an outer lock sleeve 4;

a push rod 5;

an inner lock sleeve 6;

a distal end cap 7;

a return spring 8;

a feed spring 9;

a syringe 10;

a proximal end cap 11;

a trigger sleeve 12;

a housing 13.

The structure and the installation relationship of the above components will be described below with reference to other drawings. In the following description, proximal refers to the end near the body part receiving the injection, distal to the end away from the body part receiving the injection.

Please refer to fig. 3 and fig. 4 in combination, wherein fig. 3 is a schematic perspective view of the tooth socket 1, fig. 4 is a schematic perspective view of the tooth ring 2, and the tooth socket 1 and the tooth ring 2 are main components of the sound-generating feedback function.

As shown in fig. 3, the main body of tooth socket 1 is cylindrical, the outer surface of tooth socket 1 has two protruding strips 1a with the same length, one end of each protruding strip 1a has a snap feature 103, the body portion of tooth socket 1 corresponding to snap feature 103 has an opening, and the side of snap feature 103 is a smoothly-transiting arc surface from the distal end to the proximal end, and snap feature 103 can cooperate with a corresponding structure on outer lock sleeve 4 for connecting tooth socket 1 to outer lock sleeve 4, so that tooth socket 1 cannot rotate circumferentially relative to outer lock sleeve 4.

The gullet 1 is also formed with an end face hole 101, which end face hole 101 is in particular located at the other end opposite the snap feature 103. The end surface hole 101 is non-circular, and a specific shape corresponds to a circular shape obtained by cutting out upper and lower circular arc portions of two straight lines parallel to each other at the upper and lower ends of the circular shape. This end face opening 101 can cooperate with a corresponding structure of the push rod 5 for limiting the circumferential rotational movement of the push rod 5 such that the push rod 5 can only perform a translational movement in the axial direction.

The tooth groove 1 has an internal cavity larger than the face hole 101, and a circumferential tooth groove 102 is formed on the surface of the internal cavity, and the circumferential tooth groove 102 is formed by sequentially and adjacently surrounding a plurality of teeth 102 a. The circumferential tooth grooves 102 are used for realizing the sound production feedback function in cooperation with corresponding structures of the toothed ring 2.

Referring to fig. 4, the gear ring 2 has a cylindrical main body, and the gear ring 2 is nested in the inner cavity of the tooth socket 1. Specifically, the gear ring 2 has two elastic arms 201, and the two elastic arms 201 are arranged in central symmetry along the circumferential direction of the gear ring 2; one end of each elastic arm 201 is fixed on the outer periphery of the gear ring 2, and the other end is a free end, and the free end is provided with a tooth poking part 2011 which is matched with the circumferential tooth slot 102 of the tooth slot 1 to realize a sound production function. The toothed ring 2 is tensioned in the circumferential tooth slot 102 of the tooth slot 1 by means of two resilient arms 201, and the tooth-plucking portion 2011 of each resilient arm 201 is located in the tooth slot between adjacent teeth 102a of the circumferential tooth slot 102, respectively. When the ring gear 2 rotates circumferentially with respect to the tooth socket 1, the tooth-plucking portion 2011 of the elastic arm 201 of the ring gear 2 slides in the tooth socket between the plurality of teeth 102a on the circumferential tooth socket 102 of the tooth socket 1, and a rattling sound is emitted, thereby realizing an acoustic feedback function.

Further, the ring gear 2 is provided with two slider projections 202 projecting inwardly on the inner surface of the inner hole 203 thereof, and the two slider projections 202 are disposed to be opposed to each other. The sliding block protrusion 202 is used for matching with a corresponding structure of the push rod 5, so that the push rod 5 drives the gear ring 2 to rotate along the circumferential direction when moving along the axial direction.

Fig. 5 is a schematic perspective view of the reset lock sleeve 3.

As shown in fig. 5, the reset lock sleeve 3 includes a large diameter portion 31 and a small diameter portion 32, and has an inner hole 33 therethrough.

The edge of the large-diameter portion 31 is provided with a reset lock 301. The reset locking parts 301 are respectively arranged in one direction and two in total; each reset lock 301 is a rod-like shape extending in the axial direction in the direction away from the small-diameter portion 32 at the bottom surface edge of the large-diameter portion 31 of the reset lock sleeve 3, and has an outward extending portion 3011 protruding outward in the radial direction at the end thereof away from the small-diameter portion 32.

In addition, the large diameter portion 31 of the reset lock sleeve 3 is further provided with a reset portion 303, the reset portion 303 extends in the same direction as the reset lock 301, and the reset portion 303 has a reset slope 302, and the reset slope 302 is configured to be pressed and triggered by the trigger force to rotate the reset lock sleeve 3 in the circumferential direction. The reset portions 303 are provided one in each of the opposing directions, and two in total. In fig. 5, the reset portion 303 is closer to the reset lock 301 in the circumferential direction.

In addition, two clamping grooves 311 which are opposite in the radial direction are further arranged on the edge of the bottom surface of the large-diameter part 31 of the reset lock sleeve 3, and the clamping grooves 311 are used for being matched with corresponding structures of the outer lock sleeve 4 to prevent the reset lock sleeve 3 and the outer lock sleeve 4 from rotating in the circumferential direction within a certain axial distance range.

Fig. 6 is a schematic perspective view of the outer lock sleeve 4.

As shown in fig. 6, the outer lock sleeve 4 includes two portions, a thick portion 41 and a thin portion 42, the thick portion 41 and the thin portion 42 respectively have outer walls, and the thick portion 41 and the thin portion 42 are transited by a transition platform. The thick portion 41 and the thin portion 42 each have a through hollow inner cavity.

Specifically, the outer lock sleeve 4 is provided with a surface protrusion 406 at the thin portion 42, in fig. 6, the outer lock sleeve 4 is provided with two surface protrusions 406, the two surface protrusions 406 are arranged oppositely, and the surface protrusions 406 are in a shape of ribs; the surface protrusions 406 are adapted to cooperate with corresponding structure of the distal end cap 7 to effect and guide axial movement of the outer locking sleeve 4 relative to the distal end cap 7.

In addition, the outer lock sleeve 4 also comprises the following structure:

the unlocking groove 405 is arranged on the thin part 42, specifically, two unlocking grooves 405 are arranged, and the two unlocking grooves 405 are oppositely arranged; the unlocking groove 405 is closer to the proximal end than the surface projection 406 and is circumferentially displaced from the surface projection 406;

guide protrusions 404 provided on the thick portion 41, specifically, two guide protrusions 404 are provided, and the two guide protrusions 404 are provided oppositely; the guide projection 404 can restrict the rotation of the outer lock sleeve 4 in the circumferential direction with respect to the outer shell 13, and specifically, after the outer lock sleeve 4 is mounted in the outer shell 13, the guide projection 404 is disposed in a sliding groove or a rail provided inside the outer shell 13, and the sliding groove or the rail has a circumferential dimension adapted to the guide projection 404, thereby restricting the rotation of the outer lock sleeve 4 in the circumferential direction. One particular arrangement of the guide projections 404 of the outer sleeve 4 in cooperation with the runners or tracks 131 in the housing 13 is shown in figure 7;

the sliding grooves 403 are arranged on the thick portion 41, specifically, two sliding grooves 403 are arranged, and the two sliding grooves 403 are arranged oppositely; in fig. 6, the chute 403 is specifically T-shaped; the sliding groove 403 is used for accommodating the buckling feature 103 of the tooth socket 1, so that the tooth socket 1 is fixed on the outer lock sleeve 4 and cannot rotate relatively;

the reset stops 402 are arranged on the thick portion 41, specifically, two reset stops 402 are arranged, and the two reset stops 402 are arranged oppositely; in fig. 6, the reset stop 402 is a stop formed by an L-shaped bore having one end communicating axially outward and another end located at the distal end of the reset stop 402;

the trigger surfaces 401 are arranged on the thick portion 41, specifically, the trigger surfaces 401 are inner surfaces of V-shaped grooves, and two trigger surfaces 401 are arranged in opposite directions of the thick portion 41;

two stop strips 407 are provided on the inner surface of the thick portion 41, and the two stop strips 407 are provided to face each other. The limiting strip 407 is used for matching with the two slots 311 on the bottom edge of the large-diameter portion 31 of the reset lock sleeve 3, so as to lock and unlock the outer lock sleeve 4 and the reset lock sleeve 3 in relative rotation along the axis. Specifically, in the original state after the automatic injection device is installed, the limiting strip 407 of the outer lock sleeve 4 is clamped in the clamping groove 311 of the reset lock sleeve 3, so that the relative rotation between the reset lock sleeve 3 and the outer lock sleeve 4 is prevented; and when outer lock tube 4 was triggered the power and is pressed to the direction that is close to distal end cover 7 along the axial, reset inclined plane 302 of lock tube 3 was then triggered by triggering the power and pressing after a period of time, along with the axial displacement of outer lock tube 4 this moment, spacing 407 has broken away from draw-in groove 311, and then reset lock tube 3 can be relative to outer lock tube 4 along the rotation of circumference under the effect of triggering power.

Referring to fig. 8, a schematic perspective view of the push rod 5 is shown, wherein the push rod 5 is a cylinder with an opening at one end and an inner cavity.

As shown in fig. 8, the push rod 5 has an end face feature 501, the end face feature 501 is a non-circular shape matching with the end face hole 101 of the tooth socket 1, and as seen from fig. 8, the shape of the end face feature 501 extends along the length direction of the push rod 5 and covers most of the push rod 5, such a structure arrangement realizes that the tooth socket 1 is matched with the non-circular hole shaft of the push rod 5, so that the tooth socket 1 can limit the push rod 5 from performing a rotational motion during feeding through the end face hole 101, and the push rod 5 can only perform a translational motion along the axial direction. The push rod 5 is matched with the end face of the tooth groove 1, and is shown in figure 9.

As shown in fig. 8, the outer surface of the push rod 5 has two inwardly concave spiral tracks 502, and the two spiral tracks 502 are symmetrically arranged at 180 degrees on the outer surface of the push rod 5; the spiral track 502 is used for being matched with the sliding block protrusion 202 of the toothed ring 2, so that when the push rod 5 moves along the axial direction, the toothed ring 2 is driven to rotate in the circumferential direction, the toothed ring 2 further rotates relative to the tooth socket 1, the tooth shifting portion 2011 of the elastic arm 201 of the toothed ring 2 rotates in the circumferential tooth socket 102 of the tooth socket 1 and collides with the circumferential tooth socket 102 to generate sound, and the sound feedback function of the push rod 5 in the feeding process is achieved. The matching of the push rod 5 and the toothed ring 2 is schematically shown in fig. 9.

Referring again to fig. 8, the push rod 5 is provided with two symmetrical through holes 503 at a portion near the distal end, and the through holes 503 are used for matching with corresponding structures of the inner lock sleeve 6 to realize locking in the original state and unlocking in the triggered state. Further, the inner surface of the through hole 503 at the distal end side is a slope, and the slope direction of the slope facilitates the push rod 5 to be pushed out in the axial direction.

Fig. 10 is a schematic structural view of the inner lock sleeve 6.

As shown in fig. 10, the inner lock sleeve 6 is provided with two protruding features 601 protruding inwards, the two protruding features 601 are arranged oppositely, each protruding feature 601 is arranged on a rod 61, and a space groove 60 is arranged around each rod 61. Each protruding feature 601 of the inner lock sleeve 6 is correspondingly fitted with the through hole 503 of the push rod 5. In the initial state of the automatic injection device, each protruding feature 601 of the inner lock sleeve 6 is inserted into the corresponding through hole 503 of the push rod 5, so that the push rod 5 is fixed to the inner lock sleeve 6, and the protruding feature 61 of the inner lock sleeve 6 is simultaneously restricted by the outer lock sleeve 4 sleeved thereon and cannot expand circumferentially, so that the feed spring 9 cannot push the push rod 5 to move axially. Preferably, a surface of each protruding feature 601 of the inner lock sleeve 6 facing the distal end cap 7 is a slope forming an angle with the pushing direction of the feeding spring 9, specifically a slope with a lower proximal end and a higher distal end, and the slope of the through hole 503 on the push rod 5 is in fit with the slope of the protruding feature 601 of the inner lock sleeve 6. This arrangement facilitates the proximal axial advancement of the pusher 5 under the trigger condition by the advancement spring 9.

Referring to fig. 10 again, the distal end of the inner lock sleeve 6 has two terminal protrusions 602, and the two terminal protrusions 602 are disposed opposite to each other. The inner locking sleeve 6 is detachably connected to the distal end cap 7 by two end protrusions 602.

Fig. 11 is a schematic structural view of the distal end cap 7.

The distal end cap 7 has the following structure:

the substrate 71, which is a disk in fig. 11;

a cylindrical portion 72 formed to extend vertically outward along one surface of the base 71, and a central axis of the cylindrical portion 72 coincides with a central axis of the distal end cap 7; the cylindrical portion 72 is provided with sliding grooves 702, specifically, two sliding grooves 702 are provided, and the two sliding grooves 702 are provided oppositely; the sliding groove 702 is used for matching with the surface protrusion 406 of the outer lock sleeve 4, and the surface protrusion 406 of the outer lock sleeve 4 is arranged in the sliding groove 702 at the corresponding position of the distal end cover 7, so that the mutual connection between the outer lock sleeve 4 and the distal end cover 7 is realized; also, the surface protrusion 406 is able to slide axially within the slide groove 702. Preferably, the length of the surface protrusion 406 in the circumferential direction of the outer lock sleeve 4 matches the length of the sliding groove 702 in the circumferential direction of the distal end cap 7, thereby functioning as a guide for movement and preventing circumferential rotation of the outer lock sleeve 4 and the distal end cap 7 relative to each other;

a tip groove 703 provided at a bottom position of the cylindrical portion 72 in contact with the base 71; as shown in fig. 11, the end groove 703 is provided in two (the other end groove is not visible in the drawing), and the two end grooves 703 are provided oppositely; in FIG. 11, each end flute 703 also includes a protrusion 703a disposed on either side of the flute body;

a center rod 701 disposed along the axial direction of the distal end cap 7, having one end fixed to the base 71 of the distal end cap 7 and the other end serving as a free end; the center rod 701 is positioned inside the cylindrical portion 72;

a cantilever protrusion 704 provided to protrude from the outer surface of the cylindrical portion 72 and having a hook portion, and in the structure shown in fig. 11, two cantilever protrusions 704 are provided in total, and the two cantilever protrusions 704 are provided to be opposite to each other; the distal end cap 7 is fixedly connected to the housing 13 by two cantilevered tabs 704, the cantilevered tabs 704 limiting axial separation of the distal end cap 7 from the housing 13. One specific configuration of the cantilever tabs 704 fixedly connected to the housing 13 may limit axial separation of the distal end cap 7 from the housing 13 by positioning the cantilever tabs 704 of the distal end cap 7 within the slots 130 of the housing 13, as shown in fig. 12.

Fig. 13 is a schematic structural diagram of the return spring 8.

The reset spring 8 is a spring with a thicker inner cavity, and is convenient to be sleeved outside the cylindrical part 72 of the distal end cover 7 and the thin part 42 of the outer lock sleeve 4, meanwhile, two ends of the reset spring 8 are respectively abutted against the end surfaces of the distal end cover 7 and the outer lock sleeve 4, the reset spring 8 is compressed and stores energy in an original state, and extrusion force is generated on the outer lock sleeve 4 and the distal end cover 7; after the outer lock sleeve 4 is axially extruded by the trigger force to trigger, the return spring 8 can be further compressed to store energy, and then after the trigger force is removed, the return spring 8 can push the outer lock sleeve 4 to reset.

Please refer to fig. 14, which is a schematic structural diagram of the feeding spring 9.

The feed spring 9 is a spring having a thin inner cavity and is longer than the return spring 8. The feeding spring 9 is sleeved on the central rod 701 of the distal end cover 7 after being installed, is positioned in the inner cavity of the push rod 5, one end of the feeding spring abuts against the part, located around the central rod 701, of the distal end cover 7, the other end of the feeding spring abuts against the inner surface of the end face of the push rod 5, and the feeding spring 9 is compressed to store energy in an original state, so that the push rod 5 can be pushed conveniently, and the automatic feeding function of the automatic injection device can be further realized.

Fig. 15 is a schematic structural diagram of the syringe 10.

Syringe 10 includes barrel 10a, needle cover 10b, and a needle (the needle is not visible in the view of fig. 15) in communication with barrel 10a and within needle cover 10 b. The needle cover 10b is provided with a plurality of square and strip-shaped through holes.

Fig. 16 is a schematic structural view of the proximal end cap 11.

The proximal end cap 11 is generally cylindrical in shape with a cavity therein and has an end face at one end and an open end at the other end.

As shown in FIG. 16, the inner surface of the end face of the proximal end cap 11 is provided with two opposite protrusions 1101, and the two protrusions 1101 are respectively used for being buckled in corresponding grooves of the trigger sleeve 12, so as to ensure that the proximal end cap 11 is firmly nested with the trigger sleeve 12.

Two buckles 1102 also extend from the inner surface of the end face in the inner cavity of the proximal end cap 11, and each buckle 1102 is used for correspondingly buckling in a square through hole of the syringe 10, so as to realize the fixation and connection between the proximal end cap 11 and the syringe 10.

Fig. 17 is a schematic structural view of the trigger sleeve 12.

The trigger sleeve 12 includes a hollow cylindrical portion and two opposing trigger rods extending from one end of the hollow cylindrical portion.

The inner surface of the hollow cylindrical portion near the end has two grooves 1202, and the two grooves 1202 are respectively matched and buckled with the two protrusions 1101 of the proximal end cap 11, so as to ensure that the proximal end cap 11 is firmly nested with the trigger sleeve 12.

A buckle 1201 is arranged in the middle of each trigger rod of the trigger sleeve 12, and the buckle 1201 is used for matching with a corresponding structure of the housing 13 to prevent the trigger sleeve 12 from falling out after being installed in the housing 13.

Each firing bar of the firing sleeve 12 also has a firing end 1203.

Please refer to fig. 18 and 19, which are a schematic perspective view and an internal view of the housing 13.

The housing 13 is cylindrical as a whole, and is open at both ends; near one end of the housing 13, there are two opposite notches 130 for cooperating with the cantilevered tabs 704 of the distal end cap 7 to secure the distal end cap 7 and the housing 13 to each other. The end is further provided with a runner 131 for cooperation with a guide projection 404 of the outer lock sleeve 4.

The interior of the housing 13 has two oppositely disposed baffle features 1301 (as shown in fig. 19) for cooperating with the catch 1201 of the trigger sleeve 12, and after the trigger sleeve 12 is mounted in the housing 13, the catch 1201 of the trigger sleeve 12 is limited by the baffle features 1301 in the interior of the housing 13, so as to prevent the trigger sleeve 12 from falling out after being mounted in the housing 13.

The housing 13 is also provided with two openings 1302 arranged oppositely near the other end opposite to the set end of the card slot 130.

The following describes a method of mounting the automatic injection device of the present embodiment.

Fig. 20 is an axial sectional view of the automatic injection device of the present embodiment in the initial state.

In fig. 20, the parts arranged at both ends of the automatic injection device are the proximal end cap 11 and the distal end cap 7, respectively, defining that the proximal end cap 11 is located at the proximal end and the distal end cap 7 is located at the distal end. The proximal end is an execution end of the automatic injection device and is used for receiving external trigger force or triggering sounding so as to release internal energy storage. The remote end is the operating end of the automatic injection device, the handheld part is positioned on the outer surface of the remote end of the device, and main parts related to triggering, resetting, locking, energy storage and sounding feedback functions are arranged inside the remote end position.

For the automatic injection device of the present embodiment, the feeding spring 9, the push rod 5, the toothed ring 2, the toothed groove 1, the reset lock sleeve 3, the inner lock sleeve 6, the outer lock sleeve 4, the reset spring 8 and the distal end cap 7 are jointly installed to form a driving assembly a, the trigger sleeve 12, the proximal end cap 11 and the housing 13 are jointly installed to form a housing assembly B, and the syringe 10 is called a syringe C, so that the automatic injection device is formed by combining 1 driving assembly a, 1 housing assembly B and 1 syringe C.

Referring to fig. 21, the installation method of the driving assembly a is as follows:

the reset lock sleeve 3, the tooth socket 1 and the toothed ring 2 are sequentially arranged in a near-end inner hole of the outer lock sleeve 4 from the near-end direction;

the push rod 5 and the inner lock sleeve 6 are arranged in the inner hole at the far end of the outer lock sleeve 4 from the far end;

then, the return spring 8 is nested on the outer surface of the thin part 42 of the outer lock sleeve 4 from the far end, and the feed spring 9 is nested in the inner hole of the push rod 5;

finally, the distal end cap 7 is distally mounted.

As shown in fig. 21, after the distal end cap 7 is mounted in place, the surface protrusion 406 of the outer lock sleeve 4 is engaged with the sliding slot 702 of the distal end cap 7, the end protrusion 602 of the inner lock sleeve 6 is engaged with the end slot 703 of the distal end cap 7, at this time, the return spring 8 is compressed between the outer lock sleeve 4 and the distal end cap 7, the feed spring 9 is compressed between the push rod 5 and the distal end cap 7, the end protrusion 602 of the inner lock sleeve 6 is tightly engaged with the end slot 703 of the distal end cap 7 under the tension of the return spring 8 and the feed spring 9, and the surface protrusion 406 of the outer lock sleeve 4 is tightly engaged with the sliding slot 702 of the distal end cap 7.

Specifically, one end of the return spring 8 abuts against the end of the thick portion 41 of the outer lock sleeve 4, and the other end is disposed in the space between the inner surface of the cantilever projection 704 of the distal end cap 7 and the cylindrical portion 72, as shown in fig. 24, with reference to fig. 11.

Specifically, as shown in fig. 21, an annular space is formed between a section of the inner lock sleeve 6 close to the distal end cap 7 and the cylindrical wall of the cylindrical portion 72 of the distal end cap 7 (see fig. 11), and when the outer lock sleeve 4 moves towards the distal end cap 7, the annular space provides a receiving space for a section of the end of the thin portion 42 of the moved outer lock sleeve 4, so that the outer lock sleeve 4 can slide in the distal end cap 7 cooperatively.

Specifically, the push rod 5 passes through a central hole formed after the outer lock sleeve 4, the reset lock sleeve 3, the tooth socket 1 and the toothed ring 2 are sleeved, and the near end of the push rod 5 is exposed out of the near end of an assembly formed after the outer lock sleeve 4, the reset lock sleeve 3, the tooth socket 1 and the toothed ring 2 are sleeved. Referring to fig. 20 and the above description of the components, it can be seen that the push rod 5 passes through the inner lock sleeve 6, the small diameter portion 32 of the reset lock sleeve 3, the inner hole 203 of the toothed ring 2, and the end surface hole 101 of the tooth socket 1 from the distal end to the proximal end in sequence, and the proximal end is exposed out of the outer lock sleeve 4.

Thus, in the original state, the drive unit a has a self-locking function, and since the return spring 8 and the feed spring 9 are compressed by the drive unit a locking function, the drive unit a also has a charging function. This will have beneficial effects on the implementation of sequential functions such as subsequent triggering, resetting, audible feedback, etc. of the automatic injection device.

Fig. 22 is a cross-sectional view of the housing assembly B. Referring to fig. 22, the mounting method of the housing assembly B of the automatic injection device is explained as follows:

in FIG. 22, trigger sleeve 12 is mounted proximally within the internal bore of housing 13. When in place, the tabs 1201 of trigger sleeve 12 are restrained by a stop feature 1301 on the interior of housing 13 to prevent trigger sleeve 12 from falling out after it is mounted within housing 13.

Then, the proximal end cap 11 is nested and mounted on the outer surface of the trigger sleeve 12 from the proximal direction, and during the mounting process, the protrusions 1101 of the proximal end cap 11 will snap into the grooves 1202 of the trigger sleeve 12, so as to ensure that the proximal end cap 11 is nested and fixed with the trigger sleeve 12.

Fig. 23 is a schematic sectional view of the syringe C.

Figure 24 is a cross-sectional view of the automatic injection device rotated 90 degrees about the axial direction relative to figure 20 in an initial state.

Referring to fig. 20 and 24 in combination, when the drive assembly a and the housing assembly B are assembled, the syringe C is loaded from the distal end of the housing 13, and then the drive assembly a is loaded from the distal end of the housing 13, the cantilever protrusions 704 of the distal end cap 7 are clamped in the clamping grooves 130 of the housing 13, so that the drive assembly a is mounted on the housing assembly B, and the automatic injection device is mounted.

The triggering, resetting, locking, energy storage and audible feedback functions of the automatic injection device are clearly embodied in the process of completing specific tasks. Specific task processes include, but are not limited to, a raw state, a triggered state, a running state, and an end state. Automatic injection devices accomplish the above-stated tasks through a combination of different functions. The different functions of the automatic injection device are detailed in the following accompanying task completion process.

When the auto-injector is in the primed state, the device has a locking and energy charging function, as shown in detail in fig. 20 and 24, where fig. 20 is an axial cross-section of the auto-injector in the primed state. Figure 24 is a cross-sectional view of the automatic injection device rotated 90 degrees about the axial direction.

As shown in fig. 24, the automatic injection device of this embodiment is at least characterized in that the distal end cap 7, the outer lock sleeve 4, the inner lock sleeve 6 and the plunger 5 are axially sleeved, and two symmetrical through holes 503 are formed on the outer surface of the plunger 5 and are respectively matched with two protruding features 601 inwardly formed on the inner lock sleeve 6. In the locking and energy-storing state (i.e. the original state) of the automatic injection device, the feeding spring 9 has a tendency of driving the push rod 5 to move towards the proximal end together, and in the distal end inner hole of the outer lock sleeve 4, the protruding feature 601 of the inner lock sleeve 6 is limited by the outer lock sleeve 4 and cannot expand circumferentially under the action of the feeding spring 9, so that the through hole 503 of the push rod 5 is limited by the protruding feature 601, and therefore, the automatic injection device cannot be triggered mistakenly due to environmental interference such as impact, vibration and the like in the locking state, and the stability of the automatic injection device is greatly enhanced.

The automatic injection device of the present embodiment is further characterized in that the audible feedback function of the automatic injection device is an audible function, which is embodied in a specific operating state. When the automatic injection device is triggered, the automatic injection device enters a running state and can continuously make a 'click' sound. Specifically, the audible feedback function is realized by the cooperation of the tooth socket 1 and the tooth ring 2 arranged in the automatic injection device in the components shown in fig. 20, and the sound effect of "clicking" is generated by the mechanical collision of the tooth shifting portion 2011 of the elastic arm 201 of the tooth ring 2 with the circumferential tooth socket 102 of the tooth socket 1. The specific sound mechanism will be described in detail in the operational state of the automatic injection device.

Through the sound production feedback function, the automatic injection device can produce sound outwards, and the function can be used as an interface function of man-machine interaction or machine-in interaction, so that the functional state of the automatic injection device can be monitored by a user or a sensor, and the user can conveniently perform subsequent control or decision execution.

In the installed state shown in fig. 20, the tooth socket 1 is nested in the inner bore of the outer lock sleeve 4, and the toothed ring 2 is nested in the inner bore of the tooth socket 1. Fig. 25a and 25b show the specific fit of tooth socket 1 and ring gear 2 and push rod 5 with

parts

3, 4, 6, 7, 8, 9, 10, 11, 12, 13 removed. Fig. 25a is a view from the proximal end to the distal end, and fig. 25b is a view from the distal end to the proximal end of the interior. Specifically, the gear ring 2 and the push rod 5 are in clearance fit, specifically, the slider protrusion 202 of the gear ring 2 is matched with the spiral track 502 of the push rod 5 in fig. 25 a; the tooth socket 1 and the tooth ring 2 are in clearance fit, specifically, the elastic arms 201 of the tooth ring 2 in fig. 25b are matched with the tooth form of the circumferential tooth socket 102 of the tooth socket 1, and the tooth ring 2 is tensioned in the circumferential tooth socket 102 of the tooth socket 1 through the elastic arms 201.

In fig. 25a, the end face feature 501 of the push rod 5 is engaged with the end face hole 101 of the toothed ring 1, and as can be seen from fig. 20, the push rod 5 protrudes out of the end face hole 101 of the toothed ring 1 and faces proximally, and the end face feature 501 of the push rod 5 is axially engaged with the non-circular hole of the end face hole 101 of the toothed ring 1. Such a configuration facilitates the toothed ring 1 limiting the rotary movement of the push rod 5 through the end surface hole 101, and also the toothed ring 1 is fixed to the outer lock sleeve 4 and therefore cannot rotate, so that the push rod 5 can only perform a translational movement in the axial direction.

Fig. 26a is a front view of the putter 5 showing the end face feature 501 and the helical track 502 of the putter 5. It is particularly noted that the outer surface of the push rod 5 is provided with a helical track 502, and the helical track 502 is arranged 180 degrees symmetrically on the outer surface of the push rod 5, as shown in fig. 26 b.

In the original state, the audible feedback function is in a standby state and is not triggered.

By applying a trigger force to the internal parts of the auto-injector in its home state, the home state of the auto-injector can be broken, thereby allowing the auto-injector to complete a series of time-sequential actions.

The trigger force application is shown in fig. 27, with the syringe 10 and proximal end cap 11 removed in fig. 27 for clarity of illustration of the trigger force transmission. When the trigger sleeve 12 is subjected to a pressing trigger force from the outside, the trigger end 1203 (see also fig. 17) of the trigger sleeve 12 will abut against the trigger surface 401 of the outer lock sleeve 4, and then the trigger sleeve 12 and the outer lock sleeve 4 move together in the direction of the trigger force, thereby breaking the original state of the automatic injection device and entering the trigger state. When the device is in the firing state, the automatic injection device is subjected to an external trigger force or firing sound from fig. 27, and fig. 28 is a schematic view of the firing state of the automatic injection device.

In fig. 28, when the trigger surface 401 of the outer lock sleeve 4 receives the trigger force F, the outer lock sleeve 4 moves distally and compresses the return spring 8 again. With continued application of the trigger force F, the return spring 8 is compressed and the trigger sleeve 12 and outer sleeve 4 move together distally in the direction of the trigger force, as shown in FIG. 29.

During distal compression of the return spring 8 by the outer lock sleeve 4, the auto-injector will break the locked and stored condition. As shown in fig. 30, the unlocking slot 405 of the outer lock sleeve 4 also moves axially along with the outer lock sleeve 4, when moving to the position of fig. 30, the outer lock sleeve 4 releases the circumferential expansion limitation of the protruding feature 601 on the inner lock sleeve 6 in fig. 24 under the action of the unlocking slot 405, at this time, the power of the feeding spring 9 will start to be released proximally, the through hole 503 of the push rod 5 will push the protruding feature 601 on the inner lock sleeve 6 open circumferentially under the pushing force of the feeding spring 9, as shown in fig. 30, when the protruding feature 601 is pushed into the unlocking slot 405, the push rod 5 will start to move proximally and push the medicine to be injected to the human body through the needle of the syringe 10, at this time, the trigger force F needs to be maintained continuously, the compression of the return spring 8 is maintained continuously until the feeding spring 9 is completely released and the push rod 5 is pushed to the final position, and the release final position is shown in fig. 31, and the automatic injection device realizes the push rod feeding and medicine injection functions.

During proximal translation of the pusher bar 5, the helical track 502 thereon also emerges from the drive assembly A with the pusher bar 5, as shown in FIG. 32.

In fig. 33a, the helical track 502 drives the slider protrusions 202 of the toothed ring 2 in a rotational movement during the proximal translation of the pusher 5, and the elastic arms 201 are elastically deformed to scrape the circumferential tooth slots 102 inside the tooth slots 1 when the toothed ring 2 rotates inside the tooth slots 1. As can be seen in fig. 33b, during the proximal movement of the push rod 5, the toothed ring 2 has already undergone an angular rotation about the axial direction with respect to the original position of fig. 33a, during which the elastic arms 201 generate a sound by scraping the circumferential gullets 102 of the gullets 1, in order to indicate to the person concerned that the auto-injector is performing the feed function.

At this time, the ring gear 2, the spline 1, the reset lock sleeve 3, and the inner lock sleeve 6 mounted inside the outer lock sleeve 4 are supported by each other in the axial direction, as can be seen from fig. 21, the distal end protrusion 602 of the inner lock sleeve 6 is engaged with the distal end groove 703 of the distal end cap 7, as can be seen from fig. 30, the distal end cap 7 is engaged with the engaging groove 130 of the housing 13 through the cantilever protrusion 704, the spline 1 abuts against the end of the syringe 10, the ring gear 2 is disposed in the spline 1, and the spline 1 abuts against the bottom surface of the proximal end inner hole of the reset lock sleeve 3 at the distal end thereof due to being disposed in the proximal end inner hole of the reset lock sleeve 3. Therefore, when the device is in a triggering state, the toothed ring 2, the toothed groove 1, the reset lock sleeve 3 and the inner lock sleeve 6 cannot axially displace along with the push rod 5.

When the automatic injection device is in the end state of feeding, the automatic injection device has the functions of resetting, locking and audible feedback. It is noted that the reset and lock functions of the automatic injection device are sequential functions, which are performed first in preparation when the device is in the initial state and the trigger state, and then completed in the end state of the device.

The reset and lock functions of the auto-injector are mainly achieved by the outer lock sleeve 4 and the reset lock sleeve 3.

In the activated state, the activation force F acts on the reset ramp 302 of the reset sleeve 3 in addition to the activation surface 401 of the outer sleeve 4, as shown in fig. 34a-34 e. The trigger force F may be achieved by freely setting the relative axial distance L between the trigger surface 401 and the reset ramp 302, as shown in fig. 34a, such that the outer lock sleeve 4 is axially displaced distally by the trigger force F, and then the reset lock sleeve 3 is axially rotated, as shown in fig. 34a-34 c. The circumferential position of the reset lock 301 at this time is significantly changed with respect to the initial position shown in fig. 34a and 34d as the reset lock sleeve 3 is rotated, as shown in fig. 34e, which provides for the subsequent reset and lock function of the auto-injector.

In order to more clearly describe the state of change of the components inside the device during the resetting and locking process, the shielding effect of the housing 13 and the proximal end cap 11 is removed in the following figures, and the specific timing implementation in the resetting and locking state will be described in detail by the following figures.

Fig. 35a, 36a, and 37a are schematic views of an original state of the automatic injection device, fig. 35b, 36b, and 37b are schematic views of a trigger state of the automatic injection device, and fig. 35c, 36c, and 37c are schematic views of an end state of the automatic injection device.

In fig. 35a, the automatic injection device remains in the initial installation position in which the reset sleeve 3 is installed in the proximal bore of the external sleeve 4, as shown in fig. 36 a. Also, as is evident in fig. 37a with the redundant features removed, in the initial installation state the reset stop 402 of the outer lock sleeve 4 is arranged more proximally with respect to the reset lockout 301 of the reset lock sleeve 3. At this time, the return spring 8 maintains the initial compression state without receiving an external trigger force.

In fig. 35b, the auto-injector is triggered by a trigger force F from the outside. When the outer lock sleeve 4 is subjected to an axially distally directed trigger force F, the outer lock sleeve 4 will compress the return spring 8 distally. As can be seen from fig. 34c, the trigger force F, in addition to acting on the outer lock sleeve 4 to displace it axially distally, also acts on the reset lock sleeve 3 to rotate it relative to the outer lock sleeve 4. At this time, the reset lock 301 of the reset sleeve 3 also changes in rotation with respect to fig. 36a, as shown in fig. 36 b. Furthermore, as is evident from fig. 37b, in which the redundant feature is removed, in the triggered state, the reset catch 301 of the reset sleeve 3 is displaced in the axial direction towards the distal end as a result of the outer sleeve 4, in the proximal direction relative to the reset stop 402 of the outer sleeve 4, at which point the reset spring 8 is compressed twice by the outer sleeve 4 under the influence of the trigger force F.

Figures 35a, 35b, 36a, 36b, 37a, 37b clearly illustrate the priming action of the auto-injector for the reset and lock functions.

In fig. 35c, the device is in the end state, at which point the auto-injector has completed the feeding function. In the last step, since the return spring 8 is compressed by the outer lock sleeve 4, when the trigger force F is removed, the return spring 8 will release the secondary compressed spring energy F proximally to the outer lock sleeve 4, as shown in fig. 35c, and the return spring 8 will push the outer lock sleeve 4 to be axially displaced proximally. Since the reset lock 301 of the reset sleeve 3 is located in the proximal direction relative to the reset stop 402 of the outer sleeve 4 in the last step, during the proximal axial displacement of the outer sleeve 4, the reset stop 402 will continue to abut against the inclined surface of the outward extension 3011 of the reset lock 301, causing the reset lock 301 to elastically deform and contract inward in the circumferential direction until the reset spring 8 completely releases the spring force F, and the reset lock 301 falls into the empty slot inside the reset stop 402, as shown in fig. 35c and 36 c. In contrast to fig. 36b, it is evident from fig. 36c that the reset lockout 301 is partially obscured by the reset stop 402, with the reset stop 402 of the outer jacket 4 being more proximal relative to the reset lockout 301 of the reset jacket 3, as shown in fig. 37c with the redundant feature removed. The process of the elastic deformation of the reset lock 301 is shown in fig. 38a, 38b, and 38 c. In which fig. 38a corresponds to the device state of fig. 35b, fig. 38b shows a change in the reset lock 301 of the device from fig. 35b to fig. 35c, and fig. 38c corresponds to the device state of fig. 35 c.

Comparing fig. 35c and 35a, it is clear that in the initial state and the end state of the auto-injector, the relative position of the outer lock sleeve 4 is not changed and the return spring 8 remains in the initial compressed state, so that the auto-injector completes the return function.

In particular, in fig. 37c, when the outer jacket 4 is subjected to the trigger force F from the outside and pointing to the distal end in the axial direction again, the reset lock 301 may abut against the reset stop 402, and the outer jacket 4 may not move to the distal end again, so that the automatic injection device has a locking function while completing the reset function.

In particular, in fig. 37c, 38b and 38c, the reset lock 301 elastically deforms and contracts inward in the circumferential direction while falling into the empty groove inside the reset stop 402, and after falling into the empty groove inside the reset stop 402, the reset lock 301 can elastically recover, so that under the instant elastic recovery action of the reset lock 301, the reset lock collides with the near-end inner hole wall of the outer lock sleeve 4 to generate a sound, thereby prompting a person that the automatic injection device has completed the reset and locking functions.

Therefore, the automatic injection device respectively completes the functions of energy storage, triggering, sound feedback, resetting and locking according to time sequence along with the original state, the triggering state, the running state and the ending state.

The present invention generally provides an automatic injection device.

1. The whole set of the scheme of the automatic injection device provides the technical principle of realizing the functions of energy storage, triggering, sound feedback, resetting and locking.

2. The automatic injection device of the present invention provides a transmission layout and/or method involving the combination of the components involved in the trigger mechanism, the energy storage mechanism, the audible feedback mechanism, the reset mechanism, and the locking mechanism.

3. The sound feedback mechanism of the automatic injection device is that the thread track on the push rod is used for driving the gear ring to rotate, and then the gear ring scrapes the tooth socket to generate continuous or intermittent sound feedback, and belongs to auditory feedback.

4. The inner lock sleeve of the automatic injection device is nested in the outer lock sleeve, and the inner lock sleeve can be triggered only by the outer lock sleeve axially moving a longer distance towards the far end, so that the false triggering can be prevented before the automatic injection device is used.

5. In the drive assembly of the automatic injection device, the far end cover, the outer lock sleeve, the inner lock sleeve and the push rod are axially sleeved, and two symmetrical through holes are formed in the outer surface of the push rod and are respectively matched with two protruding features arranged inwards on the inner lock sleeve. In the original state of the automatic injection device, the feeding spring has a tendency of driving the push rod to move towards the near end together, and in the far-end inner hole of the outer lock sleeve, the protruding feature of the inner lock sleeve is limited by the outer lock sleeve and cannot expand circumferentially under the action of the feeding spring, so that the through hole of the push rod is limited by the protruding feature, the automatic injection device cannot be triggered mistakenly due to the interference of environments such as impact, vibration and the like in the locking state, and the stability of the automatic injection device is greatly enhanced.

6. When the automatic injection device is reset, the reset lock sleeve rotates around the axial direction, the outer lock sleeve and the reset lock sleeve are under the action of the reset spring, and the reset locking of the reset lock sleeve can fall into the reset stop of the outer lock sleeve, so that secondary reuse can be prevented after the automatic injection device is used.

7. The automatic injection device of the present invention is excellent in safety.

The auto-injection device of the present invention has the following advantages:

2. The invention integrates the functions of energy storage, triggering, sound feedback, resetting and locking into an automatic injection device, and the technical scheme has various functional characteristics and perfect automation characteristics; according to the invention, through reasonable arrangement of a transmission structure and a scheme, the functions of releasing spring energy storage, pushing action, sounding feedback and resetting and locking after injection can be automatically completed by one-time triggering, so that the integration level of the device is greatly improved, and the complexity of the operation process is reduced; on the premise of high integration of the automatic injection device, the needle head can be automatically protected after use, and the safety requirement of the device is improved.

3. The sound production feedback function of the automatic injection device can be used as an interface for information interaction, sound is sent to the outside through specific sound feedback and tactile feedback, and the functional state of the automatic injection device can be monitored by a user, so that the user can conveniently perform the next control or decision execution. The information transfer path during operation is from the device to the person and then from the person to the device. Therefore, the device has the attribute of a closed-loop system, and the safety and the reliability of the device in the operation process can be greatly improved.

4. The automatic injection device of the invention can be used in various injection occasions (such as specific subdivision fields of chronic disease treatment, emergency treatment, diagnosis and the like) as a multifunctional automatic injection device, and the clinical applicability of the technical scheme is very wide.

5. The automatic injection device provided by the invention has the functions of triggering, energy storage, sound feedback, resetting and locking, can be reasonably adapted according to different use target groups (such as colleges, scientific research units, enterprises, education systems, medical systems and the like), can be made of metal materials or high polymer materials, and can be used as a repeatedly-used or disposable automatic injection device.

The above-described embodiments are only preferred embodiments of the present invention, but should not be construed as limiting the scope of the invention, and any modifications, equivalent structural changes, equivalent substitutions and improvements made within the spirit or essential scope of the invention are all within the scope of the present invention. Accordingly, the scope of the invention should be determined from the following claims.

Claims

An automatic injection device is characterized by mainly comprising a driving component for providing power, a shell component for providing external protection and an injector for containing medicament;

wherein the drive assembly comprises an outer lock sleeve and a distal end cap, the outer lock sleeve and the distal end cap being interconnected and the outer lock sleeve being axially moveable relative to the distal end cap, the distal end cap being connected to the housing assembly;

the energy-saving device also comprises a compressed first elastic energy storage element arranged between the outer lock sleeve and the far-end cover, an inner lock sleeve detachably connected to the far-end cover and sleeved in the outer lock sleeve, a push rod sleeved in the inner lock sleeve and penetrating through the outer lock sleeve, and a compressed second elastic energy storage element positioned in the push rod and arranged between the push rod and the far-end cover; wherein the content of the first and second substances,

the outer lock sleeve is provided with an unlocking groove;

the inner lock sleeve is provided with a protruding feature protruding inwards, and the push rod is correspondingly provided with a through hole for accommodating the protruding feature;

when the outer lock sleeve moves relative to the far-end cover under the trigger force, the first elastic energy storage element is pressed to further store energy, the unlocking groove moves out of the protruding feature of the inner lock sleeve along with the outer lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move so as to push the medicament in the injector to be discharged.
The automatic injection device of claim 1, wherein a surface of the protruding feature of the inner lock casing facing the distal end cap is a bevel that is angled with respect to the direction of urging of the second elastic energy storage element, and a surface of the through hole on the plunger that corresponds to the bevel of the protruding feature is flush with the bevel and is also a bevel.
An autoinjector according to claim 1 or claim 2, wherein said projecting feature is provided on a rod member fixed at one end to said inner lock sleeve and at the other end being a free end, said rod member having an open space therearound; one or more of the protruding feature and the lever are provided.
The automatic injection device of claim 1, wherein said outer locking sleeve has a surface protrusion, and said distal end cap has a sliding groove at a corresponding position; the surface protrusion is arranged in the sliding groove at the corresponding position of the far end cover, so that the outer lock sleeve and the far end cover are connected with each other; and, the surface projection is axially slidable within the slide slot; the surface projection of the outer lock sleeve is closer to an end of the outer lock sleeve than the unlock groove.
The automatic injection device of claim 1, wherein the inner locking sleeve has a distal end protrusion, and the distal end cap has a distal end groove at a corresponding position, and the distal end protrusion of the inner locking sleeve is correspondingly engaged with the distal end groove of the distal end cap to fix an end of the inner locking sleeve to the distal end cap.
The automatic injection device of claim 1, wherein said distal end cap further defines a central stem, said second elastic energy storing element being nested within said central stem and having one end abutting an end of said distal end cap and another end abutting an inner surface of an end of said plunger.
The automatic injection device of claim 1, wherein an outer surface of the outer lock sleeve is provided with a guide projection that cooperates with a corresponding structure of the housing assembly to limit circumferential rotation of the outer lock sleeve.
The automatic injection device of claim 1, wherein the distal end cap has a cantilevered protrusion formed thereon, the cantilevered protrusion protruding from an outer surface of the distal end cap, the distal end cap being fixedly coupled to the housing assembly via the cantilevered protrusion to limit axial separation of the drive assembly from the housing assembly.
The automatic injection device of claim 1, wherein the outer lock sleeve has a proximal bore, the drive assembly of the automatic injection device further comprises a spline and a toothed ring disposed in the proximal bore of the outer lock sleeve from the outside inward, and the spline is fixed to the outer lock sleeve, and the push rod passes through the spline and the toothed ring; the tooth socket and the push rod are matched by a hole shaft and cannot rotate relatively; the push rod is provided with a spiral track, a sliding block bulge is arranged in an inner hole of the gear ring, and the sliding block bulge is arranged in the spiral track; the outer surface of the toothed ring is provided with an elastic arm, the tooth groove is provided with a circumferential tooth groove at a corresponding position of an inner hole, the elastic arm is tensioned in the circumferential tooth groove, and the tail end of the elastic arm is provided with a tooth poking part capable of being inserted into the circumferential tooth groove.
The automatic injection device of claim 9, wherein the splines have snap features and, correspondingly, the outer lock sleeve has receiving slots, the snap features being shaped to fit within the receiving slots of the outer lock sleeve, thereby securing the splines on the outer lock sleeve to prevent relative rotation.
The automatic injection device of claim 1, wherein the drive assembly further comprises a reset sleeve that fits within the outer sleeve; the reset lock sleeve comprises a reset inclined surface which can be pushed by the trigger force borne by the outer lock sleeve to rotate the reset lock sleeve; the reset lock sleeve further comprises a reset lock sleeve, the outer lock sleeve is further provided with a reset stop corresponding to the reset lock sleeve, and after the reset lock sleeve rotates and returns to the original position under the pushing of the first elastic energy storage element, the reset stop is arranged at the near end of the reset lock sleeve.
The automatic injection device of claim 11, wherein the outer lock sleeve has a larger diameter portion at the proximal end and a smaller diameter portion at the distal end, the reset lock sleeve including a larger diameter portion and a smaller diameter portion, the larger diameter portion of the reset lock sleeve being disposed in the inner bore of the larger diameter portion of the outer lock sleeve, the smaller diameter portion of the reset lock sleeve being disposed in the inner bore of the smaller diameter portion of the outer lock sleeve; the small-diameter part of the reset lock sleeve is opposite to the end part of the inner lock sleeve.
Automatic injection device according to claim 11, characterised in that the reset lock is rod-shaped extending axially at the edge of the large-diameter portion of the reset lock sleeve and has an outward extension at its end extending radially outwards.
The automatic injection device of claim 12, wherein the inner surface of the outer lock sleeve is provided with a limiting strip, the bottom edge of the large-diameter portion of the reset lock sleeve is provided with a corresponding slot, and the limiting strip of the outer lock sleeve is clamped in the slot of the reset lock sleeve to prevent relative rotation between the reset lock sleeve and the outer lock sleeve; and the length of the limiting strip is also set to ensure that the limiting strip is separated from the clamping groove when the reset lock sleeve is pushed, so that the reset lock sleeve can rotate relative to the outer lock sleeve along the circumferential direction.
The automatic injection device of claim 1, wherein said housing assembly comprises a proximal end cap, a trigger sleeve and a housing, said trigger sleeve being mounted in a proximal direction in an inner bore of said housing, said proximal end cap being mounted nested in a proximal direction on an outer surface of said trigger sleeve, said trigger sleeve being adapted to apply a trigger force to said outer lock sleeve and to protect a needle of said syringe after said outer lock sleeve is reset by said first elastic energy storage element.
The automatic injection device of claim 15, wherein the trigger sleeve is provided with a catch and the housing is provided with a baffle feature, the catch of the trigger sleeve being restrained by the baffle feature inside the housing after the trigger sleeve is installed in the housing, preventing the trigger sleeve from falling out of the housing.
The automatic injection device of claim 15, wherein said proximal end cap has a protrusion and said trigger sleeve has a recess, said protrusion of said proximal end cap being snap fit within said recess of said trigger sleeve to effect installation of said proximal end cap and said trigger sleeve.
A method of using the automatic injection device of any of claims 1-17, comprising:

applying a trigger force or a trigger signal to the outer locking sleeve to move the outer locking sleeve relative to the distal end cap while the first elastic energy storage element is further compressed;

when the unlocking groove of the outer lock sleeve moves out of the protruding feature of the inner lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move to realize feeding;

after feeding is finished, the trigger force or the trigger signal is removed, and the first elastic energy storage element pushes the outer lock sleeve to reset.
The method of using an automatic injection device of claim 18, wherein the trigger force or trigger signal is applied through a trigger sleeve in the housing assembly.
An automatic injection device is characterized by mainly comprising a driving component for providing power, a shell component for providing external protection and an injector for containing medicament;

wherein the drive assembly comprises an outer lock sleeve and a distal end cap, the outer lock sleeve and the distal end cap being interconnected and the outer lock sleeve being axially moveable relative to the distal end cap, the distal end cap being connected to the housing assembly;

the energy-saving device also comprises a compressed first elastic energy storage element arranged between the outer lock sleeve and the far-end cover, an inner lock sleeve detachably connected to the far-end cover and sleeved in the outer lock sleeve, a push rod sleeved in the inner lock sleeve and penetrating through the outer lock sleeve, and a compressed second elastic energy storage element positioned in the push rod and arranged between the push rod and the far-end cover; wherein the content of the first and second substances,

the outer lock sleeve is provided with an unlocking groove;

the inner lock sleeve is provided with a protruding feature protruding inwards, and the push rod is correspondingly provided with a through hole for accommodating the protruding feature;

the outer lock sleeve is provided with a near-end inner hole, the driving assembly further comprises a reset lock sleeve, a tooth socket and a toothed ring which are sequentially arranged in the near-end inner hole of the outer lock sleeve from outside to inside, the tooth socket is fixed on the outer lock sleeve, and the push rod penetrates through the tooth socket and the toothed ring; the tooth socket and the push rod are matched by a hole shaft and cannot rotate relatively; the push rod is provided with a spiral track, a sliding block bulge is arranged in an inner hole of the gear ring, and the sliding block bulge is arranged in the spiral track; the outer surface of the toothed ring is provided with an elastic arm, the tooth groove is provided with a circumferential tooth groove at a corresponding position of an inner hole, the elastic arm is tensioned in the circumferential tooth groove, and the tail end of the elastic arm is provided with a tooth shifting part capable of being inserted into the circumferential tooth groove;

the reset lock sleeve comprises a reset inclined surface, the reset inclined surface can be pushed by the trigger force borne by the outer lock sleeve to further enable the reset lock sleeve to rotate, the position of the reset inclined surface is set to enable the trigger force to trigger the outer lock sleeve to move axially firstly, and then trigger the reset inclined surface to enable the reset lock sleeve to rotate after a certain distance; the reset lock sleeve further comprises a reset lock, and the outer lock sleeve is further provided with a reset stop corresponding to the reset lock, wherein after the reset lock sleeve rotates and the outer lock sleeve returns to the original position under the pushing of the first elastic energy storage element, the reset stop can be stopped at the near end of the reset lock;

when the outer lock sleeve moves relative to the distal end cover under the trigger force, the first elastic energy storage element is pressed to further store energy, the unlocking groove moves out of the protruding feature of the inner lock sleeve along with the outer lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move so as to push the medicament in the injector to be discharged; when the push rod is fed in place, the trigger force is removed, and the first elastic energy storage element can push the outer lock sleeve to return to the original position.
The automatic injection device of claim 20, wherein the housing assembly includes a trigger sleeve for applying a trigger force to the outer lock sleeve and the reset lock sleeve.
A method of triggering, signal feedback, resetting and locking an automatic injection device according to any of claims 20 or 21, comprising:

applying a trigger force or a trigger signal to the outer locking sleeve to move the outer locking sleeve relative to the distal end cap while the first elastic energy storage element is further compressed; after a predetermined time or distance, the trigger force or signal is applied to the reset lock sleeve to rotate the reset lock sleeve;

when the unlocking groove of the outer lock sleeve moves out of the protruding feature of the inner lock sleeve, the second elastic energy storage element pushes the push rod to enable the protruding feature of the inner lock sleeve to be ejected outwards, and the push rod is pushed by the second elastic energy storage element to move to achieve feeding; the push rod drives the toothed ring to rotate in the tooth groove while feeding, and the elastic arm of the toothed ring collides with the circumferential tooth groove of the tooth groove to make a sound, so that signal feedback is realized;

after the feeding is completed, the trigger force or the trigger signal is removed, the first elastic energy storage element pushes the outer lock sleeve to reset, and based on the fact that the reset lock sleeve rotates, after the outer lock sleeve resets, the reset stop is arranged outside the reset locking of the reset lock sleeve, the automatic injection device is prevented from being triggered again, and locking is achieved.