Automatic injection device and method of using same

Abstract

The present disclosure relates to an automatic injection device including a first assembly for receiving a syringe and a second assembly coupled with the first assembly. The second assembly comprises an outer shell; a drive mechanism disposed within the outer housing, which can be loaded and released, the drive mechanism storing energy when the drive mechanism is loaded, and the drive mechanism driving a movable element of the syringe towards the injection site by releasing energy when the drive mechanism is released; the holding mechanism is arranged in the outer shell and comprises a holding position and a releasing position; and a trigger mechanism disposed at the first end of the outer housing and configured to move the holding mechanism from the holding position to the release position to release the loaded drive mechanism. When the driving mechanism is loaded, the triggering mechanism rotates under the action of the pushing element until the triggering mechanism reaches a non-triggering position, and the triggering mechanism cannot be pressed down at the position. The trigger mechanism can also be manually rotated to a triggered position in which the trigger mechanism can be depressed.

Description

Technical Field

[0001] The present disclosure generally relates to reusable automatic injection devices, and methods of using the same. Background Art

[0002] Some diseases necessitate the injection of a medication or product on a regular basis (e.g., on a daily basis). To simplify treatment, some automatic injection devices (also called "autoinjectors") exist to allow patients to perform injections themselves.

[0003] The ability to self-inject has been a core driver for the development of automatic injection devices. Since patients are usually not trained in specialized injection techniques, these automatic injection devices must be simple and safe to use. For example, it is usually required that the automatic injection device must insert the needle to the correct depth, must inject the correct amount of product (i.e., a complete injection must be performed), and the needle should not be exposed before and after use to prevent any accidental needle stick injuries, etc.

[0004] In addition, for these automatic injection devices, they cannot be accidentally activated before the patient is ready to inject (especially before the automatic injection device is properly placed at the appropriate injection site). Furthermore, it is desirable that the automatic injection device can provide a constant driving force to achieve a constant injection speed and avoid giving the patient an uncomfortable injection experience.

[0005] Therefore, there is a need for an automatic injection device that can meet at least one of the above-mentioned requirements or other unmentioned requirements.

[0006] It should be noted that the subject matter claimed herein is not limited to the areas described above, is not limited to only solving any disadvantages mentioned above, and is not limited to embodiments used or operated only in environments such as those described above. Rather, this background is provided only to illustrate an exemplary technical field in which some embodiments described herein can be practiced. Summary of the invention

[0007] One of the objects of the present disclosure is to overcome one or more problems with prior art automatic injection devices and to achieve other additional advantages.

[0008] In a first aspect of the present disclosure, an automatic injection device is provided, which is used to automatically inject a fluid in a syringe into an injection site of a target. The syringe includes a barrel containing the fluid, a needle disposed at a first end of the barrel, and a movable element capable of moving in the barrel, wherein the movable element can be driven from a second end of the barrel opposite to the first end to discharge the fluid through the needle. The automatic injection device includes: a first component for removably receiving the syringe; and a second component detachably coupled to the first component. The second component comprises: an outer shell, the outer shell comprising a first end away from the first component and a second end close to the first component; a drive mechanism disposed in the outer shell, the drive mechanism being capable of being loaded and released, wherein when the drive mechanism is loaded, the drive mechanism stores energy, and when the drive mechanism is released, the drive mechanism drives the movable element of the syringe toward the injection site by releasing its stored energy; a holding mechanism disposed in the outer shell, the holding mechanism comprising a holding position for holding the loaded drive mechanism and a releasing position for releasing the loaded drive mechanism; and a trigger mechanism disposed at the first end of the outer shell, the trigger mechanism being configured to release the holding mechanism The trigger mechanism is configured to move from its holding position to its release position to release the loaded driving mechanism, wherein the trigger mechanism is configured to rotate around the central axis of the outer shell under the action of a pushing element connected to the driving mechanism when the driving mechanism is loaded, until it reaches an undeletable position, in which the trigger mechanism cannot be pressed to move the holding mechanism from its holding position to its release position; and wherein the trigger mechanism is also configured to be manually rotated around the central axis of the outer shell from the undeletable position to a triggerable position, in which the trigger mechanism can be pressed to move the holding mechanism from its holding position to its release position, thereby releasing the loaded driving mechanism.

[0009] According to one embodiment of the present disclosure, the trigger mechanism includes a bottom wall and a side wall extending from the bottom wall, the side wall having a substantially arc-shaped cross-section and including a circumferential direction and an extension direction orthogonal to the circumferential direction, the inner surface of the side wall is provided with a first groove and a second groove connected to each other, wherein the first groove extends obliquely toward the bottom wall in the extension direction and has a starting end away from the side wall and an ending end close to the side wall, the second groove extends from the ending end of the first groove along the circumferential direction of the side wall at substantially the same height and has a starting end and an ending end, and wherein the pushing element is configured as a protrusion, and when the driving mechanism is loaded, the protrusion can enter the first groove from the starting end of the first groove and rotate the trigger mechanism by pushing the groove side wall of the first groove.

[0010] According to one embodiment of the present disclosure, the depth of the second groove gradually decreases to zero from the starting end of the second groove to the ending end of the second groove, so that when the trigger mechanism rotates from the non-triggerable position to the triggerable position, the protrusion can slide out from the ending end of the second groove.

[0011] According to one embodiment of the present disclosure, the side wall of the trigger mechanism includes a first cylindrical portion which is substantially cylindrical and a second overhanging portion overhanging from the first cylindrical portion, and the first groove and the second groove are provided on an inner surface of the second overhanging portion.

[0012] According to one embodiment of the present disclosure, the inner surface of the outer shell includes a first stop portion, and when the trigger mechanism is located in the non-triggerable position, the first stop portion stops the second overhang portion to prevent the trigger mechanism from being pressed, and when the trigger mechanism is located in the triggerable position, the first stop portion is away from the second overhang portion to not prevent the trigger mechanism from being pressed.

[0013] According to one embodiment of the present disclosure, the trigger mechanism further includes at least one finger-shaped member, the free end of the finger-shaped member includes a hook portion, and the inner surface of the outer shell is provided with a second stop portion cooperating with the hook portion to prevent the trigger mechanism from detaching from the outer shell.

[0014] According to one embodiment of the present disclosure, the driving mechanism comprises a substantially cylindrical body having a closed first end and an open second end, and the pushing element is connected to the second end of the body of the driving mechanism via a rod-shaped connecting member.

[0015] According to an embodiment of the present disclosure, the pushing element, the rod-shaped connecting member, and the body of the driving mechanism are formed integrally.

[0016] According to one embodiment of the present disclosure, the second component also includes an annular protrusion arranged in the outer shell body, and when the main body of the driving mechanism moves past the annular protrusion in the direction toward the first component, a friction force is generated between the annular protrusion and the outer surface of the main body of the driving mechanism, and the friction force decreases as the distance that the main body of the driving mechanism moves in the direction toward the first component increases.

[0017] According to one embodiment of the present disclosure, the outer surface of the body of the driving mechanism includes at least one recessed portion extending from the first end of the body to the second end of the body, and the width of the recessed portion gradually increases from the first end of the body toward the second end of the body, so that when the body of the driving mechanism moves past the annular protrusion in a direction toward the first component, the contact area between the annular protrusion and the outer surface of the body of the driving mechanism gradually decreases and thereby the friction force gradually decreases.

[0018] According to one embodiment of the present disclosure, the outer surface of the body of the driving mechanism has a gradually changing smoothness, and the smoothness gradually increases from the first end of the body toward the second end of the body, so that when the body of the driving mechanism moves past the annular protrusion in a direction toward the first component, the friction force between the annular protrusion and the outer surface of the body of the driving mechanism gradually decreases.

[0019] According to one embodiment of the present disclosure, the second component further includes an inner shell fixedly disposed in the outer shell, and at least a portion of the inner shell extends from the second end of the outer shell to be connected to the first component.

[0020] According to one embodiment of the present disclosure, the annular protrusion is disposed on the inner surface of the inner shell.

[0021] According to one embodiment of the present disclosure, the annular protrusion is formed by a rubber ring, and the rubber ring is removably positioned in an annular groove on the inner surface of the inner housing.

[0022] According to one embodiment of the present disclosure, the drive mechanism includes a first spring element, which is compressed to store energy when the drive mechanism is loaded, and the first spring element is extended by releasing its stored energy when the drive mechanism is released.

[0023] According to one embodiment of the present disclosure, the holding mechanism includes a first holding element fixedly connected to the driving mechanism and a second holding element fixedly connected to the outer shell, the first holding element and the second holding element cooperate with each other to hold the loaded driving mechanism, and wherein the trigger mechanism includes an unlocking element, the unlocking element being configured to unlock the holding mechanism to release the loaded driving mechanism when the trigger mechanism is pressed.

[0024] According to one embodiment of the present disclosure, the first retaining element and the second retaining element are snap-connected to each other to retain the loaded drive mechanism, the second retaining element is configured to be resiliently deflected outward, and wherein the unlocking element is configured to bias the second retaining element outward to disconnect it from the first retaining element when the trigger mechanism is pressed.

[0025] According to one embodiment of the present disclosure, the outer surface of the outer shell is provided with a locking mark for indicating the uncatchable position and an unlocking mark for indicating the triggerable position, and the outer surface of the trigger mechanism is provided with an indicator line, when the trigger mechanism is in the uncatchable position, the indicator line is aligned with the locking mark, and when the trigger mechanism is in the triggerable position, the indicator line is aligned with the unlocking mark.

[0026] According to one embodiment of the present disclosure, the first component includes: an outer shell, the outer shell of the first component includes a first end close to the second component and a second end away from the second component; and a safety mechanism arranged at the second end of the outer shell of the first component, wherein the safety mechanism includes a safety shield and a second spring element arranged in the safety shield, wherein the safety shield is capable of moving between a first position and a second position, in the first position of the safety shield, the second spring element is expanded to push a portion of the safety shield out of the outer shell of the first component to cover the needle, and in the second position of the safety shield, the second spring element is compressed and the portion of the safety shield is pushed back into the outer shell of the first component, so that the needle can extend from the safety shield and pierce the injection site.

[0027] According to one embodiment of the present disclosure, the safety shield includes a first end for contacting the injection site and a second end opposite to the first end of the safety shield, wherein the second end of the safety shield includes a plurality of adjustment portions for adjusting the penetration depth of the needle, and each adjustment portion has a different distance from the first end of the safety shield.

[0028] According to an embodiment of the present disclosure, the safety shield is configured to be rotatable relative to the outer housing of the first component so as to select a desired insertion depth by selecting one of the plurality of adjustment parts.

[0029] According to one embodiment of the present disclosure, the outer surface of the outer shell of the first component is provided with a plurality of indicator marks respectively used to indicate different insertion depths, and the outer surface of the safety shield is provided with an indicator line, and the desired insertion depth is selected by aligning the indicator line with one of the plurality of indicator marks.

[0030] According to an embodiment of the present disclosure, an abutment portion for cooperating with any one of the plurality of adjustment portions is disposed in the outer shell of the first component.

[0031] According to an embodiment of the present disclosure, the abutment portion is configured as a rib.

[0032] According to one embodiment of the present disclosure, the first component also includes a syringe holder for holding the syringe, the syringe holder includes a third spring element, the third spring element is expanded in an initial state to hold the syringe in the first component, and the third spring element is compressed in an injection state to enable the needle of the syringe to be inserted into the injection site.

[0033] According to one embodiment of the present disclosure, the first component further comprises a cover for covering the second end of the outer shell body of the first component, the syringe comprises a cap for covering the needle, and wherein the cover comprises at least one finger-shaped member, the free end of the finger-shaped member comprises a hook portion, the hook portion of the finger-shaped member is capable of hooking on the cap of the syringe, so that when the cover is removed from the first component, the cap of the syringe is also removed.

[0034] In a second aspect of the present disclosure, a method of using the automatic injection device according to the present disclosure is provided, the method comprising an assembling step of assembling the automatic injection device and an injection step of performing automatic injection using the assembled automatic injection device.

[0035] The assembling step includes: pushing the driving mechanism of the second component from the second end of the outer shell of the second component to load the driving mechanism until the holding mechanism of the second component holds the loaded driving mechanism, at which time, the triggering mechanism of the second component is in the non-triggerable position; accommodating the syringe in the first component; and connecting the first component and the second component.

[0036] The injection step includes: pressing the assembled automatic injection device onto the target injection site; rotating the trigger mechanism from the non-triggerable position to the triggerable position; pressing the trigger mechanism to release the loaded drive mechanism; and using the drive mechanism to automatically insert the needle of the syringe into the injection site and perform the injection until the injection is completed.

[0037] The methods according to the present disclosure may be used for non-therapeutic purposes, wherein the target may not include living human and animal bodies.

[0038] According to one embodiment of the present disclosure, the method further includes: after the injection is completed, removing the automatic injection device from the injection site; disassembling the first component and the second component of the automatic injection device; removing the syringe from the first component and placing it in a recycling container.

[0039] According to an embodiment of the present disclosure, the assembling step may further include selecting one of the plurality of adjusting parts to select a desired insertion depth.

[0040] According to one embodiment of the present disclosure, the injecting step may further include removing a cap of the syringe by removing the cover before pressing the assembled automatic injection device onto an injection site of a target.

[0041] It should be noted that the various aspects of the present disclosure described for one embodiment may be included in other different embodiments, although not specifically described for the other different embodiments. In other words, all embodiments and / or features of any embodiment may be combined in any manner and / or combination, as long as they are not mutually contradictory. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to easily understand the above and other features and advantages of the present disclosure, the present disclosure will be described in more detail with reference to the specific embodiments of the present disclosure shown in the accompanying drawings. These drawings only depict typical embodiments of the present disclosure and are therefore not considered to limit the scope of the present disclosure, wherein:

[0043] Figure 1a is a disassembled perspective view of an automatic injection device according to one embodiment of the present disclosure;

[0044] Figure 1b is a front view of an automatic injection device according to one embodiment of the present disclosure;

[0045] Figure 1c is a cut-away perspective view of an automatic injection device according to one embodiment of the present disclosure;

[0046] Figure 1d is a cutaway front view of an automatic injection device according to one embodiment of the present disclosure;

[0047] Figure 2a is a front view of a second component of an automatic injection device according to one embodiment of the present disclosure;

[0048] Figure 2b is a cutaway front view from one angle of a second component of an automatic injection device according to one embodiment of the present disclosure;

[0049] Figure 2cis a cutaway perspective view of a second component of an automatic injection device according to one embodiment of the present disclosure from another angle, wherein a drive mechanism of the second component is in an unloaded position;

[0050] Figure 2d is a cutaway perspective view of a second component of an automatic injection device according to one embodiment of the present disclosure from another angle, wherein a drive mechanism of the second component is in a loaded and retained position;

[0051] Figure 3 is a perspective view of a trigger mechanism of a second assembly of an automatic injection device according to one embodiment of the present disclosure;

[0052] Figure 4 is a front view of a driving mechanism of a second component of an automatic injection device according to one embodiment of the present disclosure;

[0053] Figure 5a and Figure 5b is a cutaway perspective view of a trigger mechanism and a drive mechanism of a second assembly of an automatic injection device according to one embodiment of the present disclosure, which illustrates the cooperation between the drive mechanism and the trigger mechanism;

[0054] Figure 6 is a schematic diagram of a trigger mechanism of a second component of an automatic injection device according to an embodiment of the present disclosure in an untriggerable position, which shows an indicator line provided on an outer surface of the trigger mechanism and a locking mark and an unlocking mark provided on an outer surface of an outer housing of the second component;

[0055] Figure 7 is a schematic diagram of a trigger mechanism of a second component of an automatic injection device according to an embodiment of the present disclosure in a triggerable position;

[0056] Figure 8a is a front view of a first component of an automatic injection device according to one embodiment of the present disclosure;

[0057] Figure 8b is a cutaway front view of a first component of an automatic injection device according to one embodiment of the present disclosure;

[0058] Figure 8c is a cut-away perspective view of a first component of an automatic injection device according to one embodiment of the present disclosure;

[0059] Figure 9a is a perspective view of an inner housing of a first assembly of an automatic injection device according to one embodiment of the present disclosure;

[0060] Figure 9b is a cutaway perspective view of an inner housing of a first assembly of an automatic injection device according to one embodiment of the present disclosure;

[0061] Fig.10 is a perspective view of a safety shield of a safety mechanism of a first assembly of an automatic injection device according to one embodiment of the present disclosure;

[0062] Fig.11a is a schematic diagram showing a safety mechanism of a first assembly of an automatic injection device according to an embodiment of the present disclosure in a position corresponding to a first insertion depth (deep insertion depth);

[0063] Fig.11b is a schematic diagram showing that the safety mechanism of the first assembly of the automatic injection device according to one embodiment of the present disclosure is in a position corresponding to a second insertion depth (shallow insertion depth);

[0064] Fig.12 is a schematic diagram of a syringe for an automatic injection device according to one embodiment of the present disclosure;

[0065] Fig.13a is a front view of a first component of an automatic injection device according to one embodiment of the present disclosure, with a syringe installed;

[0066] Fig.13b is a cutaway front view of a first assembly of an automatic injection device according to one embodiment of the present disclosure, with a syringe installed;

[0067] Fig.14 is a flow chart of a method of using an automatic injection device according to one embodiment of the present disclosure;

[0068] Fig.15a is a schematic diagram of a second assembly of the automatic injection device according to the present disclosure when the drive mechanism is loaded and retained, wherein the trigger mechanism is in an untriggerable position;

[0069] Fig.15b is a schematic diagram of a syringe installed in a first assembly of an automatic injection device according to the present disclosure;

[0070] Fig.15c is a schematic diagram of connecting the second component and the first component of the automatic injection device according to the present disclosure together;

[0071] Fig.15d is a schematic diagram of removing the cover of the first component of the automatic injection device according to the present disclosure and adjusting the safety mechanism of the first component to a position corresponding to a first penetration depth;

[0072] Fig.15e is a schematic diagram of a trigger mechanism of a second component of an automatic injection device according to the present disclosure being rotated to a triggerable position;

[0073] Fig.15fis a schematic diagram of the automatic injection device according to the present disclosure being pressed onto the injection site of the target;

[0074] Figure 15g is a schematic diagram of pressing a trigger mechanism of a second component of the automatic injection device according to the present disclosure to release a drive mechanism;

[0075] Figure 15h is a schematic diagram of a state in which a driving mechanism of a second component of the automatic injection device according to the present disclosure is released and a needle of a syringe is inserted into an injection site by pushing a plunger rod of the syringe;

[0076] Fig.15i is a schematic diagram of a driving mechanism of a second component of the automatic injection device according to the present disclosure continuing to push the plunger rod of the syringe to perform an injection;

[0077] Fig.16 It is a schematic diagram showing the changes in magnitude of the spring force applied by the driving mechanism and the friction force applied to the driving mechanism during the movement of the driving mechanism of the second assembly of the automatic injection device according to the present disclosure.

[0078] It should be understood that like reference numerals refer to like elements throughout the drawings. In the drawings, the dimensions of certain features may be varied and not drawn to scale for clarity. DETAILED DESCRIPTION

[0079] The present disclosure will be described below with reference to the accompanying drawings, wherein the accompanying drawings illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in a variety of different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0080] It should be understood that the terms used in the specification are only used to describe specific embodiments and are not intended to limit the present disclosure. All terms (including technical terms and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of simplicity and / or clarity, well-known functions or structures may not be described in detail.

[0081] The singular forms "a", "said" and "the" used in the specification include plural forms unless clearly indicated. The terms "include", "comprise" and "contain" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the relevant listed items.

[0082] In the specification, when an element is said to be "on", "attached", "connected", "coupled" or "contacting" another element, the element may be directly on, attached, connected, coupled or contacting another element, or there may be intervening elements. In contrast, when an element is said to be "directly" "on", "directly attached", "directly connected", "directly coupled" or "directly contacting" another element, there will be no intervening elements.

[0083] In the specification, the terms "first", "second", or "third" are only used for convenience of description and are not intended to be limiting. Any technical features represented by "first", "second", or "third" are interchangeable.

[0084] In the specification, spatial relational terms such as "upper", "lower", "front", "back", "top", "bottom", etc. may describe the relationship of one feature to another feature in the drawings. It should be understood that the spatial relational terms include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, when the device in the drawings is turned over, features previously described as being "below" other features may now be described as being "above" the other features. The device may also be otherwise oriented (rotated 90 degrees or in other orientations), and the relative spatial relationships will be interpreted accordingly.

[0085] Reference Figures 1a to 1d , shows an automatic injection device 100 according to one embodiment of the present disclosure, which can be used to automatically inject a fluid (e.g., a liquid drug or other fluid) into an injection site of a target 101 (e.g., a living patient such as a human or an animal, or other inanimate injection object). The automatic injection device 100 may include a first component 200 and a second component 300 detachably connected to the first component 200 (e.g., threaded connection, friction fit connection, snap connection, etc.).

[0086] The first component 200 is configured to removably receive a syringe 400. The syringe 400 may be a conventional syringe commonly seen in daily life. The syringe 400 may be a pre-filled syringe pre-filled with a fluid, or a syringe filled with a fluid on-site before use. Fig.12 As more clearly shown, the syringe 400 may include a barrel 401 for containing a fluid, a needle 402 disposed at a first end 411 of the barrel 401, and a movable element 403 capable of moving within the barrel 401. The movable element 403 can be driven from a second end 412 of the barrel 401 to discharge the fluid contained in the barrel 401 via the needle 402. Fig.12In the illustrated embodiment, the movable element 403 of the syringe 400 may include a plunger rod 431 and a stopper 432 (eg, Fig.13b 400). In other embodiments, the movable element 403 may include only the stopper 432 without the plunger rod 431. The movable element 403 of the syringe 400 may be driven by a drive mechanism disposed in the second component 300, which will be described in detail below. The syringe 400 may also include a cap 404 for covering the needle 403 of the syringe 400 to prevent accidental needle stick injuries.

[0087] Reference Figure 2a to Figure 2d , the second assembly 300 of the automatic injection device 100 will be described first.

[0088] The second component 300 may include an outer shell 310. The outer shell 310 may be cylindrical, and may have a first end 311 and a second end 312. The first end 311 and the second end 312 may be open. When assembled into the automatic injection device 100, the first end 311 of the outer shell 310 may be away from the first component 200, and the second end 312 of the outer shell 310 may be close to the first component 200.

[0089] The second assembly 300 may further include a driving mechanism 320 , a holding mechanism 330 , and a triggering mechanism 340 .

[0090] The drive mechanism 320 may be disposed within the outer housing 310 for driving the movable element 403 of the syringe 400. The drive mechanism 320 can be loaded and released. When the drive mechanism 320 is loaded, the drive mechanism 320 stores energy; and when the drive mechanism 320 is released, the drive mechanism 320 drives the movable element 403 of the syringe 400 toward the injection site by releasing its stored energy.

[0091] exist Figure 2a to Figure 2d In the illustrated embodiment, the driving mechanism 320 is configured as a spring-loaded driving mechanism, which may include a driving element 321 and a spring element 322 disposed on one side of the driving element 321. When the driving mechanism 320 is loaded (for example, when the driving element 321 is pushed from the second end 312 of the outer shell 310 toward the first end 311 of the outer shell 310), Figure 5aAs shown in the figure, the spring element 322 can be compressed to store elastic potential energy. When the drive mechanism 320 is released, the spring element 322 can release its stored elastic potential energy and extend from the first end 311 of the outer shell 310 toward the second end 312 of the outer shell 310, thereby driving the movable element 403 of the syringe 400 via the drive element 321. In one embodiment according to the present disclosure, the spring element 322 is configured as a compressible and extendable coil spring. However, the present disclosure is not limited thereto. The spring element 322 can have any suitable form.

[0092] In other embodiments according to the present disclosure, the driving mechanism 320 may be configured to be loaded by other energy sources. For example, the energy source of the driving mechanism 320 may include compressible gas or other energy conversion mechanisms.

[0093] Reference Figure 4 In one embodiment according to the present disclosure, the driving element 321 is configured to have a substantially cylindrical body having a closed first end 323 and an open second end 324. The spring element 322 may extend into the interior of the driving element 321 via the open second end 324 and abut against the closed first end 323 thereof. In some embodiments, one end of the spring element 322 may also be fixedly connected to the first end 323 of the driving element 321.

[0094] In other embodiments according to the present disclosure, the driving element 321 may include a body in other shapes. For example, the driving element 321 may include a rod-shaped body, in which embodiment, the spring element 322 may be arranged around the rod-shaped body; the driving element 321 may also include a pancake-shaped body, in which embodiment, the spring element 322 may abut or be fixedly connected to one surface of the pancake-shaped body.

[0095] A holding mechanism 330 may also be disposed within the outer shell 310 for holding the loaded drive mechanism 320. The holding mechanism 330 may include a holding position and a release position, wherein the holding position may hold the loaded drive mechanism 320 to prevent its stored energy from being released, and wherein the release position may release the loaded drive mechanism 320 to enable it to release the stored energy.

[0096] exist Figure 2b to Figure 2d In the illustrated embodiment, the holding mechanism 330 includes a first holding element 331 fixedly connected to the driving mechanism 320 and a second holding element 332 fixedly connected to the outer shell 310. The holding mechanism 330 holds the loaded driving mechanism 320 by the cooperation between the first holding element 331 and the second holding element 332. Figure 2a to Figure 2cAs shown, the first retaining element 331 can be configured as a rod-shaped member. One end of the rod-shaped member can be connected to the driving element 321 of the driving mechanism 320, and the other end of the rod-shaped member is provided with a hook. The second retaining element 332 can be configured as a plurality of finger-shaped members arranged around the first retaining element 301, and the free end of each finger-shaped member can include a matching member that matches the hook of the first retaining element 301, and the matching member can make the first retaining element 331 and the second retaining element 332 snap-connected to each other to hold the loaded driving mechanism 320 (such as Figure 2d ). In one embodiment of the present disclosure, the mating piece of the second retaining element 332 is configured as a protrusion protruding inwardly. In another embodiment of the present disclosure, the mating piece of the second retaining element 332 may also be configured as an opening for receiving the first retaining element 301. In other embodiments of the present disclosure, the first retaining element 331 and the second retaining element 332 may have other different mating structures, for example, the free end of the second retaining element 332 includes a protrusion protruding inwardly, and the end of the first retaining element 331 includes a groove or opening for receiving the protrusion.

[0097] The second holding element 332 can also be configured to be resiliently deflected outwardly so as to be disconnected from the first holding element 331 when necessary to release the loaded drive mechanism 320. When the second holding element 332 is disconnected from the first holding element 331 due to the outward deflection, the holding mechanism 330 is in its release position.

[0098] The trigger mechanism 340 is configured to move the holding mechanism 330 from its holding position to its release position when necessary to release the loaded drive mechanism 320. The trigger mechanism 340 can be disposed at the first end 311 of the outer shell 310. The trigger mechanism 340 can include an unlocking element 365 to unlock the holding mechanism 330 (i.e., to move or bias the holding mechanism 330 from its holding position to its release position) when the trigger mechanism 340 is pressed, thereby releasing the loaded drive mechanism 320. The unlocking element 365 can be disposed at an appropriate position of the trigger mechanism 340 (e.g., at its center position) and have various appropriate structures, such as Figure 2c and Figure 2d shown.

[0099] In an embodiment according to the present disclosure, the trigger mechanism 340 is configured to have a function of preventing accidental triggering. To this end, the trigger mechanism 340 according to the present disclosure is configured to include a non-triggerable position and a triggerable position, in which the trigger mechanism 340 cannot be pressed to move the holding mechanism 330 from its holding position to its release position, and in which the trigger mechanism 340 can be pressed to move the holding mechanism 330 from its holding position to its release position.

[0100] In an embodiment according to the present disclosure, the trigger mechanism 340 is configured to rotate around the central axis of the outer shell 310 to reach the non-triggerable position when the driving mechanism 320 is loaded. Figure 3 and Figure 4 As shown, the trigger mechanism 340 may be configured in the form of a button. The trigger mechanism 340 may include a bottom wall 341 and a side wall 342 extending from the bottom wall 341. The side wall 342 may have a substantially arc-shaped cross-section and may include a circumferential direction and an extending direction orthogonal to the circumferential direction (in Figure 3 , the extension direction corresponds to the vertical direction). The inner surface of the side wall 342 may be provided with a first groove 343 and a second groove 344 that are connected to each other. The first groove 343 may extend obliquely toward the bottom wall 341 in the extension direction of the side wall 342 starting from the bottom surface 345 of the side wall 342 (for example, extending along a spiral line). The first groove 343 may have a starting end 346 and an ending end 347, and the starting end 346 may be located near the bottom surface 345 of the side wall 342. The second groove 344 extends at substantially the same height along the circumferential direction of the side wall 342 starting from the ending end 347 of the first groove. The second groove 344 has a starting end 348 and an ending end 349. The starting end 348 of the second groove 344 and the ending end 347 of the first groove 343 may be smoothly connected via a transition portion. In addition, the second component 300 may include a pushing element 360 connected to the driving mechanism 320. As Figure 4 As shown, the pushing element 360 can be configured as a protrusion, which can be connected to the driving mechanism 320 (for example, the body of the driving element 321 of the driving mechanism 320) via the rod-shaped connecting member 351. In one embodiment according to the present disclosure, the pushing element 360, the rod-shaped connecting member 351 and the body of the driving element 321 of the driving mechanism 320 can be integrally connected.

[0101] When the driving mechanism 320 is loaded, the driving mechanism 320 moves from the second end 312 of the outer shell 310 toward the first end 311 of the outer shell 310 along the axial direction in the outer shell 310. At this time, the pushing element 360 moves with the driving mechanism 320 and can enter the first groove from the starting end 346 of the first groove 343. When the pushing element 360 moves, it abuts and pushes the groove side wall 350 of the first groove 343. Since the groove side wall 350 is inclined, under the push of the pushing element 360, the trigger mechanism 340 will rotate so that the pushing element 360 moves from the starting end 346 of the first groove 343 toward the ending end 347 of the first groove 343. When the pushing element 360 moves to the ending end 347 of the first groove 343, the loaded driving mechanism 320 can be in a state of being held by the holding mechanism 330, and the trigger mechanism 340 can be rotated to its non-triggerable position. In this non-triggerable position, the bottom surface 345 of the side wall 342 of the trigger mechanism 340 may be stopped by the first stopper 361 provided on the inner surface of the outer shell 310 (see Figure 5b ), so that the trigger mechanism 340 cannot be pressed. The first stopper 361 can be a ridge or rib provided on the inner surface of the outer shell 310, and the length of the ridge or rib is configured not to stop the bottom surface 345 of the side wall 342 when the trigger mechanism 340 is in the triggerable position.

[0102] In the embodiment according to the present disclosure, by configuring the trigger mechanism 340 to include an untriggerable position, it is possible to effectively prevent the user from accidentally pressing the trigger mechanism 340 and releasing the loaded drive mechanism 320 before the automatic injection device 100 is ready to be used. In addition, the trigger mechanism 340 is configured to automatically rotate to the untriggerable position when the drive mechanism 320 is loaded, so that the automatic injection device 100 according to the present disclosure does not need to take a separate additional step to move the trigger mechanism 340 to the untriggerable position. This simplifies the operation of the automatic injection device 100 and avoids the adverse consequences caused by the user forgetting to take the separate additional step. Finally, the trigger mechanism 340 including the untriggerable position makes the automatic injection device 100 according to the present disclosure no longer need a separate interlock design to prevent accidental triggering, simplifying the structure of the automatic injection device 100.

[0103] In an embodiment according to the present disclosure, the trigger mechanism 340 is also configured to be manually rotated from a non-triggerable position to a triggerable position around the central axis of the outer shell 310, so as to release the loaded drive mechanism 320 when necessary. Figure 7 As shown, the bottom surface 345 of the side wall 342 of the trigger mechanism 340 is away from the first stopper 361 , so that the trigger mechanism 340 can be pressed.

[0104] In order to completely release the drive mechanism 320 and enable the drive mechanism 320 to automatically move in the outer shell 310 when the trigger mechanism 340 is in the triggerable position, the depth of the second groove 344 is configured to gradually decrease to zero from the starting end 348 of the second groove to the ending end 349 of the second groove. In this way, when the trigger mechanism 340 is rotated from the non-triggerable position toward the triggerable position, the pushing element 360 can first enter the second groove 344 from the first groove 343 and then move from the starting end 348 of the second groove 344 to the ending end 349 of the second groove 344, and move out from the ending end 349 of the second groove 344 when the trigger mechanism 340 reaches the triggerable position. At this time, the pushing element 360 is disconnected from the trigger mechanism 340, so that the drive mechanism 320 can automatically move under the action of the spring element 322.

[0105] In other embodiments according to the present disclosure, the second groove 344 may also have a constant depth. In this embodiment, in order to enable the driving mechanism 320 to automatically move in the outer shell 310, a third groove extending from the end end 349 of the second groove 344 along the extension direction of the side wall 342 toward the bottom surface 345 of the side wall 342 may also be provided on the inner surface of the side wall 342. After the trigger mechanism 340 releases the driving mechanism 320, the pushing element 360 can move along the third groove without interfering with the automatic movement of the driving mechanism 320.

[0106] exist Figure 3 In the illustrated embodiment, the side wall 342 of the trigger mechanism 340 is configured to include a substantially cylindrical first cylindrical portion 3421 and a second overhanging portion 3422 overhanging from the first cylindrical portion 3421. The first groove 343, the second groove 344, and the optional third groove may be provided on the inner surface of the second overhanging portion 3422. In other embodiments according to the present disclosure, the side wall 342 of the trigger mechanism 340 may also include only the second overhanging portion 3422 directly connected to the bottom wall 341.

[0107] like Figure 3 As shown, in one embodiment according to the present disclosure, the trigger mechanism 340 may further include at least one finger 352, such as Figure 3 The two finger-shaped members 352 are shown. The free end of the finger-shaped member 352 may include a hook portion 353. Accordingly, the inner surface of the outer shell 310 may be provided with a second stopper 354 (such as Figure 2c and Figure 2d The second stopper 354 is configured to prevent the trigger mechanism 340 from being separated from the outer shell 310 .

[0108] Reference Figure 6 and Figure 7In one embodiment of the present disclosure, in order to more clearly indicate the position of the trigger mechanism 340, the outer surface of the outer shell 310 may be provided with a locking mark 355 for indicating the non-triggerable position of the drive mechanism 320 and an unlocking mark 356 for indicating the triggerable position of the drive mechanism 320. Correspondingly, the outer surface of the trigger mechanism 340 may be provided with an indication line 357. When the trigger mechanism 340 is in the non-triggerable position, the indication line 357 is aligned with the locking mark 355 (e.g., Figure 6 When the trigger mechanism 340 is in the triggerable position, the indicator line 357 is aligned with the unlocking mark 356 (as shown in FIG. Figure 7 shown).

[0109] Reference Figure 2c and 2d , Figure 4 and Fig.16 In order to make the automatic injection device 100 have a constant injection force during the entire injection process, in one embodiment according to the present disclosure, the second component 300 may further include an annular protrusion 362 disposed in the outer shell 310. The annular protrusion 362 is configured to generate friction force with the outer surface of the body of the driving mechanism 320 when the body of the driving mechanism 320 moves through the annular protrusion 362. The friction force is designed to decrease as the distance L that the body of the driving mechanism 320 moves in the direction toward the first component 200 increases.

[0110] like Fig.16 As more clearly shown, the driving force (e.g., elastic force of the spring element) Fs of the driving mechanism 320 decreases as the distance that the body of the driving mechanism 320 moves in the direction toward the first component 200 increases. When the friction force Ff is also designed to decrease as the distance that the body of the driving mechanism 320 moves in the direction toward the first component 200 increases, the injection force applied by the driving mechanism 320 (which is the resultant force F of the driving force Fs and the spring force Ff and is equal to the magnitude of Fs minus the magnitude of Ff) can be kept constant throughout the injection process. The injection force of a constant magnitude can produce a constant injection speed and can bring a more comfortable injection experience to the user.

[0111] In order to reduce the friction force as the distance that the body of the driving mechanism 320 moves toward the first component 200 increases, in one embodiment according to the present disclosure, Figure 4As shown, the outer surface of the body of the driving mechanism 320 may include at least one recessed portion 325 extending from the first end 323 of the body to the second end 324 of the body. The width of the recessed portion 325 is configured to gradually increase from the first end 323 of the body toward the second end 324 of the body. Since the annular protrusion 362 does not contact the bottom of the recessed portion 325, when the body of the driving mechanism 320 moves past the annular protrusion 362 in the direction toward the first component 200, the contact area between the annular protrusion 362 and the outer surface of the body of the driving mechanism 320 will gradually decrease, and thus the friction force Ff will gradually decrease. In another embodiment according to the present disclosure, the outer surface of the body of the driving mechanism 320 may have a different configuration, for example, it may not include the recessed portion 325. In this embodiment, the outer surface of the body of the driving mechanism 320 may have a gradually changing smoothness (the greater the smoothness, the smaller the friction force Ff generated). For example, the smoothness can gradually increase from the first end 323 of the body of the driving mechanism 320 toward the second end 324, so that when the body of the driving mechanism 320 moves past the annular protrusion 362 in the direction toward the first component 200, the friction force Ff between the annular protrusion 362 and the outer surface of the body of the driving mechanism 320 gradually decreases.

[0112] In addition, if Figure 2c and Figure 2d As shown, in one embodiment according to the present disclosure, the second component 300 may further include an inner housing 370. The inner housing 370 may facilitate the assembly of the second component 300. The inner housing 370 may hold the drive mechanism 320 in the second component 300. The inner housing 370 may be fixedly disposed (e.g., welded, screwed, etc.) in the outer housing 310. At least a portion of the inner housing 370 may extend from the outer housing 310 to form a connection portion for connection with the first component 200. The connection portion may be inserted into the first component 200 to connect the second component 300 with the first component 200. The connection portion may be connected to the first component 200 in any appropriate manner (e.g., threaded connection, friction fit connection, snap connection, etc.). In an embodiment including the inner housing 370, the annular protrusion 362 may be disposed on the inner surface of the inner housing 370. For example, the annular protrusion 362 may be an annular protrusion integrally formed on the inner surface of the inner housing 370. The annular protrusion 362 may also be formed by a rubber ring. The rubber ring may be removably positioned in an annular groove on the inner surface of the inner housing 370 .

[0113] Next, refer to Figures 8a to 8c A first assembly 200 of the automatic injection device 100 is described.

[0114] The first assembly 200 may include an outer shell 210. The outer shell 210 may be cylindrical and may include a first end 211 and a second end 212. The first end 211 and the second end 212 may be open. When assembled into the automatic injection device 100, the first end 211 of the outer shell 210 may be close to the second assembly 300, and the second end 212 is away from the second assembly 300. The syringe 400 may be loaded into the outer shell 210 via the first end 211 of the outer shell 210.

[0115] A syringe holder 220 for holding a syringe 400 may be disposed in the outer housing 210 of the first assembly 200. The syringe holder 220 may include a first holder 221 fixedly disposed in the outer housing 210 and a second holder 222 floatable relative to the first holder 221. The syringe holder 220 may also include a spring element 223 disposed between the first holder 221 and the second holder 222. The syringe 400 may extend through the first holder 221 and the second holder 222 and be held by the first holder 221 and the second holder 222. The spring element 223 is expanded in an initial state to hold the syringe 400 in the first assembly 200 so that the needle 402 of the syringe 400 cannot extend from the outer housing 210 of the first assembly 200. The spring element 223 is compressed in an injection state so that the needle 402 of the syringe 400 can be inserted into the injection site of the target. The second holder 222 may be configured to be held in the outer housing 210 so that it cannot be disengaged from the outer housing 210. For example, the second retaining member 222 may include a hook portion 224 , and the outer shell 210 may be provided with an opening 225 that matches the hook portion 224 .

[0116] The first component 200 may include a safety mechanism 230 disposed at the second end 212 of the outer housing 210 of the first component 200. The safety mechanism 230 is configured to further cover the needle 402 of the syringe 400 to cover the needle 402 before using the syringe 400 to prevent accidental needle stick injuries. The safety mechanism 230 may include a safety shield 231 and a spring element 232 disposed in the safety shield 231. With the help of the spring element 232, the safety shield 231 can move between a first position and a second position. In the first position, the spring element 232 is expanded to push a portion of the safety shield 231 out of the outer housing 210 of the first component 200 to cover the needle 402. In the second position, the spring element 232 is compressed and the portion of the safety shield 231 is pushed back into the outer housing 210 of the first component 200, so that the needle 402 can extend from the safety shield 231 and pierce the injection site of the target 101.

[0117] See also Fig.10, the safety shield 231 may be substantially cylindrical. The safety shield 231 may include a first end 2311 for contacting the injection site and a second end 2312 opposite to the first end 2311. In one embodiment according to the present disclosure, the second end 2312 of the safety shield 231 may include a plurality of adjustment portions for adjusting the penetration depth of the needle 402 into the injection site. The distance from each adjustment portion to the first end 2311 of the safety shield 231 is different to adjust the depth of the safety shield 231 retracted into the outer shell 210 of the first component 200. For example, if the safety shield 231 is retracted to a deeper depth into the outer shell 210, the needle 402 can be inserted deeper into the injection site (i.e., a deep penetration depth); and if the safety shield 231 is retracted to a shallower depth into the outer shell 210 of the first component 200, the needle 402 can be inserted shallower into the injection site (i.e., a shallow penetration depth). In Fig.10 In the illustrated embodiment, the second end 2312 of the safety shield 231 includes two adjustment portions 2313 and 2314. However, the safety shield 231 may include more adjustment portions, such as three, four, five, six, eight, etc. adjustment portions.

[0118] The outer shell 210 of the first component 200 may be provided with an abutment portion 233 for cooperating with any one of the plurality of adjustment portions. The abutment portion 233 may abut against the top of each adjustment portion (e.g., adjustment portions 2313 and 2314) to limit the depth of the safety shield 231 retracted into the shell 210. Figure 9b In the illustrated embodiment, the abutment portion 233 is configured as a rib-shaped member. However, the abutment portion 233 may have various shapes, for example, the abutment portion 233 may be configured as a protrusion having any shape.

[0119] In one embodiment of the present disclosure, in order to select different insertion depths, the safety shield 231 is configured to be rotatable relative to the outer shell of the first component 200, so as to select one of the multiple adjustment parts by rotating the safety shield 231. In addition, in order to more easily and intuitively judge the selected insertion depth, a plurality of indicator marks for indicating different insertion depths may be provided on the outer surface of the outer shell 210 of the first component 200. For example, Fig.11a and Fig.11b As shown, an indicator mark "H" for indicating a deep insertion depth and an indicator mark "L" for indicating a shallow insertion depth may be provided on the outer surface of the outer housing 210 of the first component 200. More indicator marks may be provided on the outer surface of the outer housing 210 of the first component 200 according to the number of adjustment parts. In addition, an indicator line 2315 may be provided on the outer surface of the safety shield 231. The desired insertion depth may be rotated by rotating the indicator line 2315 of the safety shield 231 to align with one of the indicator marks.

[0120] return Figure 9a and Figure 9b In one embodiment according to the present disclosure, the first component 200 may further include an inner housing 240 fixedly disposed in the outer housing 210. The first retaining member 221, the opening 225, and the abutment portion 233 mentioned above may be disposed on the inner housing 240. However, the inner housing 240 is not necessary. In some embodiments, the first component 200 may include only the outer housing 210, or the outer housing 210 and the inner housing 240 may be formed integrally.

[0121] Reference Figures 8a to 8c as well as Figure 13a to Figure 13b In one embodiment according to the present disclosure, the first component 200 may further include a cover 250 for covering the second end 212 of the outer shell 210 of the first component 200. The cover 250 may include at least one finger 251, such as Figure 8c The plurality of fingers 251 are shown. The free end of each finger 251 may include a hook 252, such as a hook protruding toward the center of the outer housing 210 of the first assembly 200. After the syringe 400 including the cap 404 is loaded on the first assembly 200, the hook 252 of each finger 251 may be hooked on the cap 404 (for example, on the trailing edge of the cap 404), so that when the cover 250 is removed from the first assembly 200, the cap 404 of the syringe 400 may also be removed at the same time, which can simplify the operation steps of the automatic injection device 100. When a plurality of fingers 251 are included, the plurality of fingers 251 may be arranged circumferentially around the central axis.

[0122] Next, refer to Figures 14 to 15i A method 500 of using an automatic injection device 100 according to the present disclosure is described.

[0123] The method 500 may include an assembly step 510 of assembling the automatic injection device. The assembly step 510 may include:

[0124] Step 511, the driving mechanism 320 of the second component 300 is pushed from the second end 312 of the outer shell 310 of the second component 300 to load the driving mechanism 320, until the holding mechanism 330 of the second component 300 holds the loaded driving mechanism 320, at which time, the triggering mechanism 340 of the second component 300 is simultaneously rotated to a non-triggerable position, such as Fig.15a As shown;

[0125] Step 512, the syringe 400 is accommodated in the first component 200, such as Fig.15b As shown;

[0126] Step 513, connecting the first component 200 and the second component 300 to form an assembled automatic injection device 100, such as Fig.15c As shown;

[0127] After assembling the automatic injection device 100, the method 500 may include an injection step 520 of performing an automatic injection using the assembled automatic injection device 100. The injection step 520 may include:

[0128] Step 521, when the first assembly 200 includes the cover 250, remove the cover 250. In this step, the cap 404 of the syringe 400 can be moved by removing the cover 250;

[0129] Step 522, when the safety shield 231 of the safety mechanism 230 of the first component 200 includes a plurality of adjustment parts, one of the plurality of adjustment parts is selected to select a desired insertion depth (e.g., Fig.15d As shown, in this figure, the adjustment portion of the safety shield 231 is adjusted to a deep insertion position);

[0130] Step 523, the automatic injection device 100 after adjusting the safety shield 231 is pressed on the injection site of the target 101, such as Fig.15f As shown;

[0131] Step 524, rotating the trigger mechanism 340 of the second component 300 from the non-triggerable position to the triggerable position, such as Fig.15e As shown;

[0132] Step 525, pressing the trigger mechanism 340 in the triggerable position from the first end 311 of the outer shell 310 of the second component 300 to release the loaded driving mechanism 320, such as Figure 15g As shown;

[0133] Step 526, using the drive mechanism 320 to automatically insert the needle 402 of the syringe 400 into the injection site of the target 101 (eg, Figure 15h ), and perform the injection (as Fig.15i until the injection is completed.

[0134] After the injection is completed, the method 500 may further include:

[0135] Step 530, removing the automatic injection device 100 from the injection site;

[0136] Step 531, disassembling the first component 200 and the second component 300 of the automatic injection device 100; and

[0137] In step 532, the syringe 400 after injection is removed from the first assembly 200 and placed in a recycling container.

[0138] The automatic injection device 100 according to the present disclosure may be reusable. Therefore, the same automatic injection device 100 and a new syringe 400 may be used to repeat the above steps 510 to 532 to implement the injection. In addition, it should be noted that some of the above steps 510 to 532 may be omitted in some cases, and the order of some of the steps may be changed as needed.

[0139] Although the automatic injection device 100 and the method of use thereof according to the present disclosure are described above in the context of drug injection, it should be noted that the automatic injection device 100 and the method of use thereof according to the present disclosure can be applied to other technical fields. For example, the automatic injection device 100 according to the present disclosure can be used in the industrial field to inject the required process fluid into the required industrial parts; for another example, the automatic injection device 100 according to the present disclosure can be used to inject fluids such as pesticides into plants or other inanimate organisms; etc. Therefore, the automatic injection device 100 according to the present disclosure can be used for non-therapeutic purposes.

[0140] Although the exemplary embodiments of the present disclosure have been described, it should be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in essence. Therefore, all changes and modifications are included in the scope of protection of the present disclosure as defined by the claims. The present disclosure is defined by the appended claims, and the equivalents of these claims are also included.

Claims

1. An automatic injection device for automatically injecting a fluid in a syringe into an injection site of a target, the syringe comprising a barrel containing the fluid, a needle disposed at a first end of the barrel, and a movable element capable of moving within the barrel, the movable element being capable of being driven from a second end of the barrel opposite to the first end to discharge the fluid through the needle, wherein: The automatic injection device comprises: a first assembly for removably receiving the syringe; and a second component detachably coupled to the first component, the second component comprising: an outer shell, the outer shell comprising a first end away from the first component and a second end close to the first component; a drive mechanism disposed within the outer housing, the drive mechanism being capable of being loaded and released, wherein when the drive mechanism is loaded, the drive mechanism stores energy, and when the drive mechanism is released, the drive mechanism drives the movable element of the syringe toward the injection site by releasing its stored energy; a holding mechanism disposed in the outer shell, the holding mechanism comprising a holding position for holding the loaded drive mechanism and a releasing position for releasing the loaded drive mechanism; and A trigger mechanism is arranged at the first end of the outer shell, and the trigger mechanism is configured to move the holding mechanism from its holding position to its release position to release the loaded driving mechanism, wherein the trigger mechanism is configured to rotate around the central axis of the outer shell under the action of a pushing element connected to the driving mechanism when the driving mechanism is loaded, until it reaches an undeletable position, in which the trigger mechanism cannot be pressed to move the holding mechanism from its holding position to its release position; and wherein the trigger mechanism is also configured to be manually rotated around the central axis of the outer shell from the undeletable position to a triggerable position, in which the trigger mechanism can be pressed to move the holding mechanism from its holding position to its release position, thereby releasing the loaded driving mechanism.

2. The automatic injection device according to claim 1, wherein: The trigger mechanism comprises a bottom wall and a side wall extending from the bottom wall, the side wall having a substantially arc-shaped cross section and including a circumferential direction and an extending direction orthogonal to the circumferential direction, the inner surface of the side wall is provided with a first groove and a second groove communicating with each other, wherein the first groove extends obliquely toward the bottom wall in the extending direction and has a starting end away from the side wall and an ending end close to the side wall, the second groove extends from the ending end of the first groove along the circumferential direction of the side wall at substantially the same height and has a starting end and an ending end, and wherein the pushing element is configured as a protrusion, and when the driving mechanism is loaded, the protrusion can enter the first groove from the starting end of the first groove and rotate the trigger mechanism by pushing the groove side wall of the first groove; Preferably, the depth of the second groove gradually decreases to zero from the starting end of the second groove to the ending end of the second groove, so that when the trigger mechanism rotates from the non-triggerable position to the triggerable position, the protrusion can slide out from the ending end of the second groove; Preferably, the side wall of the trigger mechanism comprises a first cylindrical portion which is substantially cylindrical and a second overhanging portion overhanging from the first cylindrical portion, and the first groove and the second groove are arranged on the inner surface of the second overhanging portion; Preferably, the inner surface of the outer shell includes a first stop portion, when the trigger mechanism is in the non-triggerable position, the first stop portion stops the second overhang portion to prevent the trigger mechanism from being pressed, and when the trigger mechanism is in the triggerable position, the first stop portion is away from the second overhang portion to not prevent the trigger mechanism from being pressed; and / or The trigger mechanism further comprises at least one finger-shaped member, the free end of the finger-shaped member comprises a hook portion, and the inner surface of the outer shell is provided with a second stopper portion cooperating with the hook portion to prevent the trigger mechanism from being separated from the outer shell.

3. The automatic injection device according to claim 1 or 2, wherein: The driving mechanism comprises a substantially cylindrical body having a closed first end and an open second end, and the pushing element is connected to the second end of the body of the driving mechanism via a rod-shaped connecting member; Preferably, the pushing element, the rod-shaped connecting member, and the body of the driving mechanism are integrally formed; Preferably, the second component further comprises an annular protrusion disposed in the outer shell, and when the body of the driving mechanism moves past the annular protrusion in a direction toward the first component, a friction force is generated between the annular protrusion and the outer surface of the body of the driving mechanism, and the friction force decreases as the distance moved by the body of the driving mechanism in the direction toward the first component increases; Particularly preferably, the outer surface of the body of the driving mechanism comprises at least one recessed portion extending from the first end of the body to the second end of the body, and the width of the recessed portion gradually increases from the first end of the body toward the second end of the body, so that when the body of the driving mechanism moves past the annular protrusion in the direction toward the first component, the contact area between the annular protrusion and the outer surface of the body of the driving mechanism gradually decreases and thus the friction force gradually decreases; and / or The outer surface of the body of the driving mechanism has a gradually changing smoothness, and the smoothness gradually increases from the first end of the body toward the second end of the body, so that when the body of the driving mechanism moves past the annular protrusion in the direction toward the first component, the friction between the annular protrusion and the outer surface of the body of the driving mechanism gradually decreases.

4. The automatic injection device according to claim 3, wherein: The second component further comprises an inner shell fixedly disposed in the outer shell, at least a portion of the inner shell extending from the second end of the outer shell to be connected to the first component; Preferably, the annular protrusion is arranged on the inner surface of the inner shell; And preferably, the annular protrusion is formed by a rubber ring which is removably positioned in an annular groove on the inner surface of the inner housing.

5. The automatic injection device according to any one of claims 1 to 3, wherein: The drive mechanism comprises a first spring element which is compressed to store energy when the drive mechanism is loaded and which is extended by releasing its stored energy when the drive mechanism is released; and / or The holding mechanism comprises a first holding element fixedly connected to the drive mechanism and a second holding element fixedly connected to the outer shell, the first holding element and the second holding element cooperate with each other to hold the loaded drive mechanism, and wherein the trigger mechanism comprises an unlocking element, the unlocking element is configured to unlock the holding mechanism to release the loaded drive mechanism when the trigger mechanism is pressed; preferably, the first holding element and the second holding element are snap-connected to each other to hold the loaded drive mechanism, the second holding element is configured to be resiliently deflected outwardly, and wherein the unlocking element is configured to bias the second holding element outwardly to disconnect it from the first holding element when the trigger mechanism is pressed; and / or The outer surface of the outer shell is provided with a locking mark for indicating the uncatchable position and an unlocking mark for indicating the triggerable position, and the outer surface of the trigger mechanism is provided with an indicator line. When the trigger mechanism is in the uncatchable position, the indicator line is aligned with the locking mark, and when the trigger mechanism is in the triggerable position, the indicator line is aligned with the unlocking mark.

6. The automatic injection device according to any one of claims 1 to 3, wherein: The first component comprises: An outer shell, the outer shell of the first component includes a first end close to the second component and a second end away from the second component; and a safety mechanism disposed at a second end of the outer housing of the first component, wherein the safety mechanism comprises a safety shield and a second spring element disposed in the safety shield, wherein the safety shield is movable between a first position and a second position, wherein in the first position of the safety shield, the second spring element is expanded to push a portion of the safety shield out of the outer housing of the first component to cover the needle, and in the second position of the safety shield, the second spring element is compressed and the portion of the safety shield is pushed back into the outer housing of the first component, so that the needle can extend from the safety shield to penetrate the injection site; Preferably, the safety shield comprises a first end for contacting the injection site and a second end opposite to the first end of the safety shield, wherein the second end of the safety shield comprises a plurality of adjustment parts for adjusting the insertion depth of the needle, and each adjustment part has a different distance from the first end of the safety shield; And preferably, the safety shield is configured to be rotatable relative to the outer housing of the first component so as to select a desired insertion depth by selecting one of the plurality of adjustment parts.

7. The automatic injection device according to claim 6, wherein: The outer surface of the outer shell of the first component is provided with a plurality of indicator marks for indicating different insertion depths respectively, and the outer surface of the safety shield is provided with an indicator line, and the desired insertion depth is selected by aligning the indicator line with one of the plurality of indicator marks; Preferably, an abutment portion for cooperating with any one of the plurality of adjustment portions is provided in the outer shell of the first component; Particularly preferably, the abutment portion is configured as a rib.

8. The automatic injection device according to any one of claims 1 to 3, wherein: The first component further comprises a syringe holder for holding the syringe, the syringe holder comprising a third spring element, the third spring element being expanded in an initial state to hold the syringe in the first component, and the third spring element being compressed in an injection state to enable the needle of the syringe to be inserted into the injection site; and / or The first component further comprises a cover for covering the second end of the outer shell of the first component, the syringe comprises a cap for covering the needle, and wherein the cover comprises at least one finger-shaped member, the free end of the finger-shaped member comprises a hook portion, the hook portion of the finger-shaped member can be hooked on the cap of the syringe, so that when the cover is removed from the first component, the cap of the syringe is also removed.

9. A method of using an automatic injection device according to any one of claims 1 to 8 for non-therapeutic purposes, comprising: The assembly step of assembling the automatic injection device comprises: Pushing the driving mechanism of the second component from the second end of the outer shell of the second component to load the driving mechanism until the holding mechanism of the second component holds the loaded driving mechanism, at which time, the triggering mechanism of the second component is in the non-triggerable position; housing a syringe in said first assembly; and connecting the first component and the second component; The automatic injection step of using the assembled automatic injection device comprises: Pressing the assembled automatic injection device onto an injection site of a target, wherein the target does not include a living human or animal body; rotating the trigger mechanism from the non-triggerable position to the triggerable position; depressing the trigger mechanism to release the loaded drive mechanism; and The drive mechanism is used to automatically insert the needle of the syringe into the injection site and perform the injection until the injection is completed.

10. The method according to claim 9, further comprising: After the injection is completed, removing the automatic injection device from the injection site; disassembling a first component and a second component of the automatic injection device; removing the syringe from the first assembly and placing it in a recovery container; Preferably, when the automatic injection device is the automatic injection device according to claim 6 or 7, the assembling step further comprises selecting one of the plurality of adjustment parts to select a desired insertion depth; Preferably, when the automatic injection device is the automatic injection device according to claim 8, the injecting step further comprises removing the cap of the syringe by removing the cover before pressing the assembled automatic injection device onto the injection site of the target.

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