Automatic injection device for syringe

Abstract

The present disclosure relates to an automatic injection device for a syringe, comprising an operating part for operating the syringe and a receiving part for receiving the syringe, wherein the operating part and the receiving part are detachably connected to each other. The operating part includes an accumulator capable of accumulating energy and releasing the accumulated energy, a trigger mechanism for triggering the energy release of the accumulator, and a moving member that can move towards the receiving part when the accumulator releases energy and operate the syringe in the receiving part to perform an automatic injection process, thereby realizing automatic injection of a drug into the syringe.

Description

Technical Field

[0001] Cross - reference to related applications This application claims priority to Chinese Patent Application No. 202210757003.4, filed on June 29, 2022, the disclosure of which is hereby incorporated by reference in its entirety into this specification.

[0002] The present invention relates to the field of medical devices, and more specifically, to an automatic injection device for a syringe.

Background Art

[0003] A syringe is a common instrument for injecting drugs into the human body or an animal's body. However, the use of a syringe is difficult for non - professionals other than doctors and nurses. Manually operating a syringe to complete an injection operation is difficult for non - professionals, and there is a possibility of accidental injury due to the sharp needle of the syringe. Also, when a patient injects themselves, they may feel fear of the needle. Therefore, for example, in cases where self - injection of drugs is frequently required, such as self - injection of insulin by diabetic patients, an auxiliary tool that can assist in completing drug injection with a syringe is very useful.

[0004] Existing auxiliary tools for assisting drug injection are usually complex in structure and operation. Some of the auxiliary tools can only be used once and are costly. Also, existing auxiliary tools may be prone to misoperation, leading to possible drug waste. In the case of a pre - filled syringe (also called "PFS"), the cap is tightly fastened and cannot be removed by hand, especially for the elderly. Finally, when using an auxiliary tool, it also makes sense for the operator to indicate the injection state.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, an object of the present invention is to provide an automatic injection device for a syringe that can solve at least one of the above - mentioned technical problems existing in the prior art.

Means for Solving the Problem

[0006] According to one aspect of the present disclosure, the present disclosure provides an automatic injection device for a syringe. The automatic injection device includes an actuating part for actuating the syringe and a receiving part for receiving the syringe. The actuating part and the receiving part are detachably connected to each other. The actuating part includes an accumulator that can accumulate energy and release the accumulated energy, a trigger mechanism for triggering the energy release of the accumulator, and a moving member that can move toward the receiving part to actuate the syringe in the receiving part to execute an automatic injection process when the accumulator releases energy. The technical effects that can be achieved by the automatic injection device include, but are not limited to, the fact that the automatic injection device can realize automatic injection of a drug into the syringe.

[0007] Advantageously, the accumulator can accumulate energy by moving the moving member in a direction away from the receiving part. Advantageously, the actuating part has a support, and the moving member is axially movable with respect to the support. Advantageously, the support includes a protruding guide strip, and the moving member includes a guide groove that cooperates with the protruding guide strip respectively. Or, the support includes a guide groove, and the moving member includes a protruding guide strip that cooperates with the guide groove respectively.

[0008] Advantageously, the accumulator is configured as a spring disposed between the support and the moving member.

[0009] Advantageously, the actuating part includes a housing, the support is substantially disposed in the housing and fixedly connected to the housing.

[0010] Advantageously, the trigger mechanism is configured as a button having a pressing portion outside the support and a pivoting portion inside the support, and the pivoting portion is pivotably supported by the support.

[0011] Advantageously, the button includes a holding portion on the pivoting portion, the moving member includes a tab, the moving member is movable until the tab is positioned above the holding portion, and is held by the holding portion.

[0012] Advantageously, the actuating portion has a pressing prevention lever that is switchable between a prevention position for preventing pressing of the button and a release position for releasing the pressing of the button.

[0013] Advantageously, the pressing prevention lever includes a pressing prevention portion, the button has two pivoting portions that are parallel to each other and spaced apart, the button includes a pressing prevention portion between the two pivoting portions, the pressing prevention portion of the pressing prevention lever can be blocked by the pressing prevention portion of the button in the prevention position, and is movable into the gap between the two pivoting portions in the release position.

[0014] Advantageously, a spring is provided between the pressing prevention lever and the support. When no external force is applied to the pressing prevention lever, the spring pushes the pressing prevention lever into its prevention position, and when an external force is applied to the pressing prevention lever, the pressing prevention lever can move to the release position against the spring force.

[0015] Advantageously, the pressing prevention lever includes an operating portion for applying an external force to the pressing prevention lever.

[0016] Advantageously, the operating portion can be guided in the guide groove of the support.

[0017] Advantageously, the actuating portion includes a torsion spring that presses on the pressing portion of the button on one hand and presses on the support on the other hand, whereby the torsion spring can automatically reset the button after the button is released.

[0018] Advantageously, the moving member includes at least one energy storage rod, and the moving member is movable away from the receiving portion by operating the energy storage rod.

[0019] Advantageously, a pressing piece is provided between two opposing energy storage rods, and the moving member can press the injection rod of the syringe toward the receiving portion via the pressing piece.

[0020] Advantageously, in order to detachably connect the operating portion and the receiving portion, the operating portion includes an L-shaped engaging groove, and the receiving portion includes a locking projection configured to cooperate therewith, or the operating portion includes a locking projection, and the receiving portion includes an L-shaped engaging groove configured to cooperate therewith.

[0021] Advantageously, the receiving portion includes a housing and a receiving sleeve in the housing and axially movable relative to the housing, and the receiving sleeve can receive and support the injection tube of the syringe.

[0022] Advantageously, the receiving sleeve includes a first flange facing the operating portion, and the first flange supports two horizontal tabs of the injection tube of the syringe.

[0023] Advantageously, the first flange includes a plurality of vertical tabs spaced apart from each other in the circumferential direction, and the vertical tabs circumferentially limit the horizontal tabs of the injection tube.

[0024] Advantageously, the receiving sleeve includes at least two second flanges arranged axially continuously and spaced apart, and the second flanges can be axially guided by the housing.

[0025] Advantageously, the housing is provided with a viewing window, the moving member is provided with a mark, and the receiving sleeve is also provided with a mark. When the injection is completed, the mark of the moving member and the mark of the receiving sleeve can be seen simultaneously through the viewing window.

[0026] Advantageously, the receiving part is provided with an injection depth adjustment assembly capable of presetting the injection depth of the injection needle of the syringe.

[0027] Advantageously, the injection depth adjustment assembly includes a stopper bulge and a fitting stopper cooperating with the stopper bulge. The fitting stopper is provided with a plurality of stepped portions having different heights, and each of the stepped portions can stop the stopper bulge.

[0028] Advantageously, the receiving part includes a housing and a receiving sleeve located in the housing and axially movable relative to the housing. The receiving sleeve can receive and support the injection tube of the syringe. The stopper bulge is fixedly arranged on the receiving sleeve, and the fitting stopper is circumferentially movable and axially fixedly arranged on the housing.

[0029] Advantageously, the fitting stopper has an operation handle configured to be operated from the outside of the housing. The operation handle is movable in a horizontal slot of the housing so as to align a corresponding stepped portion of the fitting stopper with the stopper bulge.

[0030] Advantageously, the housing is provided with a scale provided in the horizontal slot. The scale indicates the presettable injection depth of the injection needle.

[0031] Advantageously, the receiving portion is provided with a needle shield at its lower end, the needle shield has a needle shield position protruding from the housing and a retracted position retracted into the housing, the needle shield shields the injection needle of the syringe so that the injection needle of the syringe is not visible, and the needle shield is in the retracted position during injection.

[0032] Advantageously, the needle shield includes a barrel portion having both ends opened so that the injection needle can pass through, and at the needle shield position of the needle shield member, the barrel portion at least circumferentially surrounds the tip of the injection needle of the syringe.

[0033] Advantageously, the barrel portion is provided with a flange that can be stopped at an inner bead at the lower end of the housing.

[0034] Advantageously, the barrel portion is provided with an inner bead at the lower end of the barrel portion, the spring is supported on the inner bead on one hand and on the receiving sleeve on the other hand, and when no external force is applied, the needle shield is always in the needle shield position.

[0035] Advantageously, the needle shield includes an elongated trigger piece, the trigger mechanism is configured as a button, the actuating portion includes a pressing prevention lever configured to be switched between an initial prevention position that prevents pressing of the button and a release position that releases the pressing of the button, the trigger piece extends toward the pressing prevention lever, and the pressing prevention lever is configured to operate the pressing prevention lever to bias it from the prevention position to the release position.

[0036] Advantageously, when the needle shield is in the needle shield position, the pressing prevention lever is in the prevention position, and when the needle shield is in the retracted position, the pressing prevention lever is in the release position.

[0037] Advantageously, the automatic injection device further comprises a cap removal part for removing the needle cap of the syringe, and the cap removal part is detachably connected to the receiving part.

[0038] Advantageously, the cap removal part comprises a cylindrical connecting part that opens towards the receiving part and is configured to be fitted onto the outer peripheral surface of the receiving part.

[0039] Advantageously, the connecting part has convex points on its inner peripheral surface, and the receiving part has engaging recesses on its outer peripheral surface, or the receiving part has convex points on its circumferential surface, and the connecting part has engaging recesses on its inner peripheral surface. Advantageously, the cap removal part comprises an operation flange connected to the lower end of the connecting part.

[0040] Advantageously, the cap removal part has a clamping mechanism for clamping the needle cap of the syringe, the clamping mechanism has a plurality of claws arranged continuously in the circumferential direction, and the claws are configured to clamp the needle cap and act on the needle cap from behind.

[0041] Advantageously, the automatic injection process includes a puncture process in which the receiving sleeve moves axially relative to the housing, and a subsequent drug injection process in which the receiving sleeve does not move axially relative to the housing.

[0042] Advantageously, the automatic injection device is reusable.

[0043] Those skilled in the art will understand the advantages of the corresponding embodiments and various additional embodiments by reading the detailed description of the corresponding embodiments with reference to the drawings included below.

Brief Description of the Drawings

[0044] The present disclosure will be further described as follows with reference to the accompanying drawings and embodiments.

Figure 1A

Figure 1B

Figure 1C

Figure 1D

Figure 1E

Figure 2A

Figure 2B

Figure 2C

Figure 3

Figure 4A

Figure 4B

Figure 4C

Figure 5A

Figure 5B

Figure 5C

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13A

Figure 13B

Figure 14A

Figure 14B

Figure 15A

Figure 15B

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22A

Figure 22B

Figure 23

Figure 24A

Figure 24B

Figure 24C

Figure 24D

Figure 24E

Figure 24F

Figure 24G

Figure 24H

Embodiments for Carrying Out the Invention

[0045] The following description is provided to enable those skilled in the art to create and use embodiments contemplated for carrying out the present disclosure. Various modifications, equivalents, variations, and alternatives will be readily apparent to those skilled in the art. All such modifications, variations, equivalents, and alternatives are intended to be included within the spirit and scope of the present disclosure.

[0046] In the following description, the terms "upper", "lower", "right", "left", "vertical", "horizontal", "up", "down", "sideways", "longitudinal", and derivatives thereof shall relate to the present disclosure as shown in the drawings. However, it is understood that the present disclosure can assume various alternative variations unless explicitly specified to the contrary. It is also understood that the specific devices shown in the accompanying drawings and described in the following specification are merely exemplary embodiments of the present disclosure. Therefore, the specific dimensions and other physical characteristics related to the embodiments disclosed herein should not be considered limiting.

[0047] Various embodiments of the present disclosure will be described below. In this description, for illustrative purposes only, various systems, structures, and devices are schematically depicted in the drawings, but not all features of the actual systems, structures, and devices are described. For example, well-known functions and structures are not described in detail to avoid unnecessary details that would obscure the present disclosure. Of course, in an actual application, it is to be understood that many specific implementation decisions need to be made to achieve the specific goals of the developer or user, and it is necessary to comply with system-related and industry-related limitations. These specific goals may vary depending on the actual application. Also, such specific implementation decisions are complex and time-consuming, but it is to be understood that this is routine work for those skilled in the art who can benefit from the present disclosure.

[0048] The terms and phrases used in this specification are to be understood and construed to have a meaning consistent with the understanding of those skilled in the relevant art. Consistently using a term or phrase in this specification is not intended to imply a particular definition of the term or phrase, i.e., a definition different from the ordinary customary meaning understood by those skilled in the art. For a term or phrase intended to have a special meaning, i.e., a meaning different from the meaning understood by those skilled in the art, this special definition is clearly described in the definition by way of explanation and directly and clearly gives the special definition to the term or phrase.

[0049] Unless required by context, throughout the following description, the words "comprise" and its variations, such as "comprises" or "comprising", are to be interpreted in an open, inclusive sense, i.e., as "including, but not limited to".

[0050] Throughout this specification, when terms such as "embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" are referred to, it is to be understood that the specific features, structures, materials, or characteristics described with reference to the embodiment or example are included in at least one embodiment or example of the present disclosure. Accordingly, the phrases "in an embodiment" or "in one embodiment" that appear in various places in this specification do not necessarily refer to a single embodiment.

[0051] Furthermore, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. Also, terms such as "first", "second", etc. are used for illustrative purposes only and should not be construed as indicating relative importance, or implying, or suggesting the number of technical features. Accordingly, features defined as "first", "second", etc. may include one or more features, explicitly or implicitly. In the description of the present disclosure, the meaning of "a plurality" is two or more unless otherwise specified.

[0052] In the present disclosure, unless otherwise specified, terms such as "attached", "connected", "coupled", "joined", "fixed", etc. should be understood in a broad sense. For example, they may be fixedly connected, removably connected, integrally connected, directly connected, indirectly connected through an intermediate medium, or internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific situation.

[0053] In the following description of the drawings, throughout the drawings and their descriptions, like reference numerals refer to like or identical elements. Further, the features of the drawings described below are not necessarily drawn to scale. The sizes of the features and elements of the drawings may be appropriately enlarged or reduced to more clearly illustrate the embodiments of the present disclosure. For supplementary aspects of the teachings that can be directly identified from the drawings, reference can be made to the relevant prior art.

[0054] Here, it should be noted that various modifications and variations can be made in the form and details of the embodiments without departing from the general concept of the present disclosure.

[0055] Hereinafter, with reference to FIGS. 1 to 24H, an embodiment of an automatic injection device 1 for a syringe 2 according to the present disclosure will be described. The automatic injection device 1 can be used as an auxiliary device for assisting in the injection of a drug. By using the automatic injection device 1, the drug in the syringe 2 can be automatically injected into the human body (or the body of an animal). The operator of the automatic injection device 1 may be a medical staff in a hospital, the patient himself / herself, or a person around the patient. For example, the patient can use the automatic injection device 1 to complete the injection by himself / herself at any time and anywhere. The automatic injection device 1 is reusable and can perform thousands of injections by itself, and only needs to be loaded with a new syringe 2 for each injection. The syringe 2 may be a fixed-dose (for example, 1 ml or 0.5 ml, etc.) prefilled syringe (hereinafter referred to as "PFS") 2 or other suitable syringe 2 types. Next, as an example of the syringe 2, the PFS 2 will be described.

[0056] Referring to FIGS. 1A to 1E, the automatic injection device 1 can be configured in the form of an injection pen that can be conveniently operated by the operator's hand. In this embodiment, the automatic injection device 1 can include, from top to bottom, an operating portion 3 for operating the PFS 2, a receiving portion 4 for receiving the PFS 2, and a cap removing portion 5 for removing the needle cap 6 of the PFS 2.

[0057] The "up" and "down" directions related to the description in this specification refer to the directions shown in FIGS. 1A - 1E of the auto - injection device 1 and its components. Although the drawings referred to in the description show diagonal or horizontal directions, the expressions of the "up" and "down" directions are still used with reference to the directions shown in FIGS. 1A - 1E.

[0058] Next, the operating part 3 of the auto - injection device 1 and its main components will be exemplarily described with reference to FIGS. 2A - 12.

[0059] Referring to FIG. 3, the operating part 3 may include a housing 7 having a generally elongated cylindrical structure. The upper end of the housing 7 is closed by an upper wall, and the lower end is open. The housing 7 may have a rectangular notch 8 on its side wall. This notch 8 may extend upward from the lower end of the housing 7 and end at a position away from the upper wall.

[0060] Referring to FIGS. 4A - 4C, the operating part 3 may be accommodable within the housing 7 and may have a support 9 fixedly connected to the housing 7. The support 9 may have an upper wall at its upper end. The upper surface of the upper wall may be placed on the bottom surface of the upper wall of the housing 7. The upper wall of the support 9 may be provided, at its bottom or inner center, with a spring strut 10 extending away from the upper wall, for example, integrally formed. This spring strut 10 may have a cross - shaped cross - section. Of course, the cross - sectional shape of the spring strut 10 may be other shapes such as circular or square.

[0061] The support body 9 may have, at its lower end, a cylindrical portion 11 with both ends open and closed in the circumferential direction. The cylindrical portion 11 may have, in its circumferential direction, a bent portion 12 extending radially inward, and this bent portion 12 may form a guide groove 13 with a rectangular cross-section and opening radially outward. On the outer peripheral surface of the cylindrical portion 11, a flange 14 may be provided slightly above the center, and the flange 14 may project radially outward from the outer peripheral surface of the cylindrical portion 11. The lower end surface of the housing 7 may abut against the upper end surface of the flange 14. At the lower end of the cylindrical portion 11, L-shaped engaging grooves 15 are provided on both sides in the diametrically opposite directions, and the L-shaped engaging grooves 15 include a vertical groove portion opening downward and a horizontal groove portion connected to the upper end of the vertical groove portion.

[0062] The support body 9 may have two vertical connecting pieces 16 connecting the top wall at its upper end and the cylindrical portion 11 at its lower end to each other. The vertical connecting pieces 16 can be arranged to face each other, and here, they face each other in the diametrical direction.

[0063] Referring to FIG. 4B, the support body 9 may have two protruding guide strips 17 (only one is shown here) on its inner side, and each protruding guide strip 17 may extend parallel to the longitudinal axis of the support body 9 on the inner side of one vertical connecting piece 16 and on the inner peripheral surface of the cylindrical portion 11. The support body 9 may have, at its upper part, a horizontal connecting piece 18 connecting the two vertical connecting pieces 16 to each other. The horizontal connecting piece 18 may be provided with a notch 19 closed in the circumferential direction in the shape of a quadrilateral. Inside the horizontal connecting piece 18, a pin receiving portion 20 having pin receiving holes on both sides of the notch 19 may be provided. Either one of the two pin receiving portions 20 of the support body 9 can rotatably receive, for example, the end portion of a pin 21 (see FIG. 9).

[0064] The support 9 has a third vertical connecting piece 22, and the third vertical connecting piece 22 is connected to the horizontal connecting piece 18 and the flange 14 at both ends thereof, respectively. The third vertical connecting piece 22 and the flange 14 can partially close the radially outer side of the guide groove 13. The upper end of the third vertical connecting piece 22 may extend to the lower side of the notch 19 of the horizontal connecting piece 18. The third vertical connecting piece 22 is embedded in the notch 8 of the housing 7 in a form-fitting manner, and the outer surface of the third vertical connecting piece 22 may smoothly transition to the outer peripheral surface of the side wall of the housing 7. Referring to FIG. 2C, a tab 24 extending radially inward is provided inside the third vertical connecting piece 22, and a spring strut 25 extending downward from the lower end surface of the tab 24 is provided below the tab 24.

[0065] Referring to FIGS. 5A to 5C, the actuating part 3 may have a moving member 26 that is accommodated in the support 9 and configured to be axially movable relative to the support 9. For this purpose, the moving member 26 may have, for example, two energy storage rods 27 arranged diametrically opposite to each other. The energy storage rods 27 may each be provided with a guide groove 28 in its longitudinal direction. The guide grooves 28 of the two energy storage rods 27 can be radially outwardly opened away from each other. The energy storage rods 27 of the moving member 26 are attached to the guide grooves 28 around the protruding guide strip 17 of the support 9 and axially guided, whereby the moving member 26 is axially movable relative to the support 9 but cannot rotate circumferentially. The energy storage rods 27 each have, at its upper part, a hook 29 formed by a radial projection, and the hook 29 is configured to be hooked on the upper part of one protruding guide strip 17, defining the maximum downward movement position of the moving member 26 relative to the support 9. At the maximum downward movement position of the moving member 26, the energy storage rods 27 partially protrude from the lower end of the support 9. By pushing the lower ends of the two energy storage rods 27 of the moving member 26 upward, the moving member 26 can be biased against the support 9 or the housing 7. Referring to FIG. 7, the length of the energy storage rod 27 substantially corresponds to the length of the support 9, and the energy storage rod 27 is axially movable relative to the support 9 until the energy storage rod 27 is completely received by the support 9. Referring to FIGS. 5A to 5C, each energy storage rod 27 is provided with a mark 30 at its lower part and outside, and the mark 30 can be respectively configured as a structure or color block that can be easily identified by the operator, and its function will be described below.

[0066] The moving member 26 has a disk-shaped pressing piece 31, and both ends of the disk-shaped pressing piece 31 may be connected to the inner sides of the two energy storage rods 27 facing each other. The lower surface of the disk-shaped pressing piece 31 is pressed against the upper end surface 33 (see FIG. 23) of the injection rod 32 of the PFS2 and presses the injection rod 32 during injection. The moving member 26 may have a spring strut 34. The spring strut 34 is disposed at the center of the disk-shaped pressing piece 31 and extends upward, for example, toward the spring strut 10 on the upper wall of the support body 9. Similarly, the spring strut 34 may have a cross-shaped cross section. Of course, the cross-sectional shape of the spring strut 34 may be other shapes such as circular or square.

[0067] Referring to FIGS. 6 and 7, the operating portion 3 has an energy accumulator, and the energy accumulator may be designed as an operating spring 35. The upper end of the operating spring 35 is attached around the spring strut 10 of the support body 9, and the lower side thereof is configured to be attached around the spring strut 34 of the moving member 26. Thereby, when the moving member 26 is pushed upward with respect to the support body 9, the operating spring 35 is further compressed and biased. When the moving member 26 is at the lowest position with respect to the support body 9, that is, when the hook 29 is placed on the protruding guide strip 17, the operating spring 35 remains in a compressed state, whereby the operating spring 35 can always pre-compress the moving member 26 and the support body 9 against each other. In order to further compress the operating spring 35, a sleeve 36 is mounted around the spring strut 34 of the moving member 26, and the lower portion of the operating spring 35 is pressed against the upper end surface of the sleeve 36. However, the sleeve 36 is not essential here, and sufficient force accumulation can be achieved, for example, by selecting a spring having an appropriate size and spring constant as the operating spring 35.

[0068] The moving member 26 has a sector tab 37, and both ends of the sector tab 37 are connected to the two energy storage rods 27. The sector tab 37 forms an inclined surface 38 outside the central position, and the inclined surface 38 faces upward (specifically, obliquely upward).

[0069] Referring to FIGS. 8A-8B, the actuating part 3 has a trigger mechanism that can be configured as a button 38. The button 38 is received above the notch 8 of the housing 7 and has a pressing part 39 that can be pressed from the outside. The button 38 has two sheet-like pivoting parts 40 that are integrally connected to the lower part of the pressing part 39 and are parallel to each other with a horizontal distance therebetween. The pivoting parts 40 can project into the support 9 from the notch 19 of the support 9, but the pressing part 39 is still outside the support 9. Each of the pivoting parts 40 is provided with a pin receiving part 41 having a pin receiving hole at a substantially central part. The pin 21 can pass through both the pin receiving hole of the pin receiving part 20 of the support 9 and the pin receiving hole of the pin receiving part 41 of the button 38, thereby pivotally connecting the button 38 to the support 9.

[0070] Referring to FIG. 8A, the button 38 is provided with a pressing prevention part 42 between the two pivoting parts 40 at its lower part, and a gap is formed between the two pivoting parts 40 above the pressing prevention part 42. The pressing prevention part 42 has a pressing prevention surface 43 facing radially outward.

[0071] Referring to FIG. 8B, the button 38 has a holding part 44 located radially inside with respect to the pressing prevention part 42. The holding part 44 has an upward holding surface 45 and an inclined surface 46 facing radially inward and oriented downward (specifically, obliquely downward). The inclined surface 46 cooperates with the inclined surface 38 of the sector tab 37 of the moving member 26 to facilitate the upward movement of the sector tab 37 of the moving member 26 over the holding part 44 of the button 38.

[0072] Referring to FIG. 12, as described above, the moving member 26 moves upward with respect to the support 9 until the sector tab 37 of the moving member 26 passes through the holding portion 44 of the button 38 and is positioned above the holding portion 44. As a result, the lower end surface of the sector tab 37 abuts against the holding surface 45 of the holding portion 44 from above, and when the button 38 is not pressed, the energized actuating spring 35 can prevent the moving member 26 from being pushed downward. When the button 38 is pressed, based on the lever principle, the lower portions of the two pivoting portions 40 and the holding portion 44 pivot radially outward, and the holding surface 45 is offset radially from the lower end surface of the sector tab 37. As a result, the moving member 26 moves downward by the restoring force of the actuating spring 35.

[0073] Referring to FIG. 10, the actuating portion 3 has a torsion spring 47. One end of the torsion spring 47 is pressed against the inside of the pressing portion 39 of the button 38 (see FIG. 2c), and the other end of the torsion spring 47 is pressed against the support 9. The torsion spring 47 can always press the pressing portion 39 of the button 38 radially outward and is automatically reset when the pressing is completed.

[0074] Referring to FIGS. 2C and 11, the actuating portion 3 includes a pressing prevention lever 48 having a pressing prevention portion 49 extending radially inward at its upper end. For example, referring to FIG. 21, at the blocking position of the pressing prevention lever 48, the pressing prevention portion 49 is located between the pressing prevention surface 43 of the button 38 and the inner peripheral surface of the support 9 to block the pressing of the button 38. The pressing prevention lever 48 is movable upward from the blocking position to the release position as shown in FIG. 2C. At the release position of the pressing prevention lever 48, the pressing prevention portion 49 is located above the pressing prevention surface 43 of the button 38. When the button 38 is pressed at this position, the pressing prevention portion 49 is biased into the gap between the two pivoting portions 40, whereby the pressing prevention surface 43 of the button 38 is no longer blocked by the pressing prevention portion 49 of the pressing prevention lever 48, and the button 38 moves radially outward so as to be pressed.

[0075] The pressing prevention lever 48 is provided with a recess 50 that opens radially outward below the pressing prevention portion 49. A spring strut 51 extending upward is provided on the lower end surface of the recess 50. A small pressing prevention spring 51 (see Fig. 2C) with a pre-applied load has its both ends attached between the spring strut 51 of the pressing prevention lever 48 and the spring strut 25 of the tab 24 of the support 9, and is pre-loaded, and its return force constantly pushes down the pressing prevention lever 48 downward. When no external force is applied to the pressing prevention lever 48, the pressing prevention lever 48 is always in the blocking position due to the action of the return force of the pressing prevention spring 51. Referring to Fig. 21, at the initial blocking position of the pressing prevention lever 48, the upper end surface 52 of the recess 50 abuts against the upper end surface of the tab 24 of the support 9. Referring to Fig. 2C, at the release position of the pressing prevention lever 48, the upper end surface 52 of the recess 50 moves upward from the upper end surface of the tab 24 of the support 9.

[0076] The pressing prevention lever 48 has an operation portion 53 at its lower end. By operating the operation portion 53, an external force can be applied to the pressing prevention lever 48, and the pressing prevention lever 48 is biased from the blocking position to the release position against the return force of the pressing prevention spring 51. Referring to Fig. 2C, the operation portion 53 of the pressing prevention lever 48 passes through the guide groove 13 of the cylindrical portion 11 of the operating portion 3 and is guided axially therein. The operating portion 53 can extend outward from the guide groove 13 at its lower operating end 54.

[0077] Next, the receiving portion 4 of the automatic injection device 1 and its main components will be exemplarily described with reference to Figs. 13A to 21.

[0078] Referring to FIGS. 14A and 14B, the receiving part 4 includes a housing 55 having a generally elongated cylindrical structure. The housing 55 has a main body part 57 and an upwardly open radially enlarged part 58 connected to the upper end of the main body part 57. An upward transfer surface 59 may be formed inside the housing 55 between the main body part 57 and the radially enlarged part 58. Locking protrusions 60 are provided on both sides of the inner peripheral surface of the radially enlarged part 58 of the housing 55, and the locking protrusions 60 are biased to the horizontal groove part through the L-shaped engaging groove of the cylindrical part 11 of the operating part 3, thereby realizing a removable connection between the receiving part 4 and the operating part 3. Of course, it can also be expected that the receiving part 4 and the operating part 3 are detachably connected by other connection methods such as screw connection. The housing 55 includes two protruding guide strips 61 facing the inner peripheral surface of the main body part 57 of the housing 55. The energy storage rods 27 of the moving part 26 are respectively fitted into the guide grooves 28 around the protruding guide strips 61 of the housing 55, and are guided longitudinally by the guide grooves 28, whereby the moving member 26 can move longitudinally relative to the support 55 and cannot rotate.

[0079] The housing 55 has two visual windows 62 (see FIG. 14A) spaced circumferentially above the two protruding guide strips 61 of its main body part 57, and the operator can visually observe the inside of the housing 55 from the outside through the visual windows 62. When the energy storage rod 27 of the moving member 26 descends until its mark 30 reaches the visual window 62, the mark 30 of the energy storage rod 27 can be respectively visually observed from the visual window 62.

[0080] Referring to FIGS. 15A - 15B, the receiving part 4 has a receiving sleeve 63, and an injection tube 64 of PFS2 is inserted from the upper part of the receiving sleeve 63. The length of the receiving sleeve 63 is shorter than or substantially equivalent to the length of the injection tube 64 of PFS2. When the injection tube 64 of PFS2 is inserted into the receiving sleeve 63, the injection needle 65 of PFS2 and the needle cap 6 attached around it protrude from the lower end of the receiving sleeve 63, and the injection rod 32 of PFS2 protrudes from the upper end of the receiving sleeve 63.

[0081] The receiving sleeve 63 has an upper flange 66 that supports two horizontal tabs 67 at the proximal end of the injection tube 64 of the PFS2 by an upward-facing flange surface, whereby the operating FS2 can be prevented from further entering into the receiving sleeve 63. To prevent rotation of the injection tube 64 of the PFS2 relative to the receiving sleeve 63, a plurality of, here four, vertical tabs 68 arranged at the same intervals are successively arranged circumferentially at the upper flange 66, and the gap width between adjacent vertical tabs 68 corresponds to the horizontal width of any one of the horizontal tabs 67 of the injection tube 64, such that the horizontal tabs 67 of the injection tube 64 are latched into two opposite gaps, respectively. The diameter of the upper flange 66 is smaller than the inner diameter of the main body portion 57 of the housing 55, and the upper flange 66 is movable within the main body portion 57 without interfering with the main body portion 57.

[0082] The receiving sleeve 63 is located below the upper flange 66 and has two intermediate flanges 69 that are axially spaced apart from each other. The two intermediate flanges 69 may have the same shape. The outer diameter of each intermediate flange 69 corresponds to the inner diameter of the main body portion 57 of the housing 55, whereby each intermediate flange 69 is axially guided and moves up and down within the main body portion 57 of the housing 55. Each intermediate flange 69 respectively allows the two energy storage rods 27 of the moving member 26 to pass through and has two radially outwardly opening notches 70 facing each other, whereby the moving member 26 is axially movable relative to the receiving sleeve 63 without interfering with the receiving sleeve 63. The mark 71 is provided on the outer peripheral surface of the upper intermediate flange 69 near the two notches 70, and the mark 71 may be formed as a structure or color block that can be easily identified by the operator. When the receiving sleeve 63 descends and its mark 71 reaches the viewing window 62, the mark 71 can be seen from the viewing window 62. Thereby, the viewing window 62 is arranged so as to be able to simultaneously view both the mark 71 on the upper intermediate flange 69 of the receiving sleeve 63 and the mark 30 on the energy storage rod 27 of the moving member 26, and has dimensions that allow both the mark 71 on the upper intermediate flange 69 of the receiving sleeve 63 and the mark 30 on the energy storage rod 27 of the moving member 26 to be simultaneously viewed. For example, both of them can be arranged horizontally side by side. Furthermore, each intermediate flange 69 has a third notch 72.

[0083] The receiving sleeve 63 has a lower flange 73 at its lower end, and the diameter of the lower flange 73 may be smaller than the diameter of any of the intermediate flanges 69. The lower flange 73 includes two portions 74, 75 that are axially arranged adjacent to each other in sequence, and the diameter of the upper flange portion 74 may be larger than the diameter of the lower flange portion 75.

[0084] Referring to FIG. 16, the receiving portion 4 has a stop ring 76 that is supported on the transfer surface 59 of the housing 55 and fixed (e.g., by a screw (not shown)). The stop ring 76 can stop the upper intermediate flange 69 of the receiving sleeve 63 at its lower end surface, thereby preventing the receiving sleeve 63 from protruding upward from the housing 55. The stop ring 76 includes two radially inner open recesses 77 through which the energy storage rod 27 of the moving member 26 passes, and a third radially inner open notch 78.

[0085] Referring to FIGS. 13b, 17 and 18, the receiving portion 4 has an injection depth adjustment assembly, the injection depth adjustment assembly includes a stopper bulge 79, and the stopper bulge 79 is provided on the outer peripheral surface of the receiving sleeve 63 below the upper intermediate flange 69 of the receiving sleeve 63. The injection depth adjustment assembly further includes a fitting stopper 80 that cooperates with the stopper bulge 79. The fitting stopper 80 has an arcuate stopper wall 81, and the inner side of the stopper wall 81 is in contact with the outer peripheral surface of the receiving sleeve 63. At the upper end of the stopper wall 81, for example, steps 82 with gradually decreasing height and different heights may be provided. Here, four steps 82 with different heights are shown. Each step 82 can be used to stop the stopper bulge 79 by moving the fitting stopper 80 circumferentially relative to the stopper bulge 79 to prevent further downward movement of the receiving sleeve 63. Therefore, the fitting stopper 80 has two circumferential guide pieces 83 arranged in parallel with a vertical interval therebetween. The radially inner side of each circumferential guide piece 83 is fixed to the stopper wall 81, and the arcuate radially outer side of each circumferential guide piece 83 is in contact with the inner wall of the housing 55. Two corresponding cooperating circumferential guide pieces (not shown) are provided on the inner wall of the housing 55, and the inner wall of the housing 55 is provided above the upper circumferential guide piece 83 and below the lower circumferential guide piece 83, respectively. Thereby, the two circumferential guide pieces 83 of the fitting stopper 80 are axially snap-fitted, circumferentially guided, and axially locked between the two fitting circumferential guide pieces 83 of the housing 55. The fitting stopper 80 has a substantially cylindrical operation handle 84. The radially inner part of the operation handle 84 can be inserted into a hole of a protrusion 85 provided outside the stopper wall 81, and the protrusion 85 can be arranged between the two circumferential guide pieces 83 of the fitting stopper 80. The operation handle 84 projects radially outward from a horizontal slot 86 provided in the housing 55 so that it can be operated by an operator. The operation handle 84 has a neck portion that engages with the horizontal slot 86 and is circumferentially guided between its radially inner part and radially outer part.Referring to FIG. 13b, a scale 87 is provided on the outer peripheral surface of the housing 55 above the horizontal slot 86, and the injection depth corresponding to the horizontal position of the operation handle 84 can be read from the scale 87, for example, here it is 8 mm, 6 mm, 5 mm, 4 mm. Referring to FIG. 18, when it is necessary to adjust the injection depth of the injection needle 65 of the PFS2 into the human body, it is only necessary to rotate the operation handle 84 horizontally to a desired depth value, whereby the step portion 82 corresponding to the corresponding height of the fitting stopper 80 moves directly below the stopper bulge 79 of the receiving sleeve 63.

[0086] Referring to FIG. 19, the receiving portion 4 is provided with a needle shield 88 at its lower end, which can shield the injection needle 65 of the PFS2 when no injection is being performed, so that the injection needle 65 of the PFS2 cannot be seen from the outside. Thereby, on the one hand, it is possible to prevent the injection needle 65 from accidentally injuring the human body, and on the other hand, it is possible to prevent the operator from feeling fear by seeing the injection needle 65. The needle shield 88 has a barrel portion 89 with both ends open, and a flange 90 is provided at the upper end of the barrel portion 89. The lower end of the flange 90 abuts against the inner bead 91 at the lower end of the housing 55 (see FIG. 21) to prevent the barrel portion 89 from protruding completely from the lower end of the housing 55. An inner bead 92 (see FIG. 21) defining a diameter larger than the diameter of the needle cap 6 of the PFS2 is provided at the lower end of the barrel portion 89. The needle shield 88 is provided with an elongated trigger piece 93 connected to the flange 90 and extending upward. The trigger piece 93 is axially guided within the third notch 78 of each intermediate flange 69 of the receiving sleeve 63 and the third notch 78 of the stop ring 76. Referring to FIG. 21, the trigger piece 93 of the needle shield 88 is disposed directly below the pressing prevention lever 48, so that when the needle shield 88 is pressed upward (or biased) and moves upward, the upper end of the trigger piece 93 can bias the operating end 54 of the operating portion 53 of the pressing prevention lever 48 to apply an external force to the pressing prevention rod 48. The pressing prevention rod 48 can move upward against the return force of the pressing prevention spring 51 to release the pressing prevention against the button 38. When the needle shield 88 is not pressed, the upper end of the trigger piece 93 of the needle shield 88 is separated from the operating end 54 of the operating portion 53 of the pressing prevention lever 48 or is in loose contact with each other, whereby the trigger piece 93 of the needle shield 88 does not exert an external force on the pressing prevention lever 48, and the pressing prevention lever 48 can be in the blocking position by the action of the return force of the pressing prevention spring 51. In this way, at the blocking position of the pressing prevention rod 48, the pressing prevention rod 48 can prevent the button 38 from being pressed accidentally, and the automatic injection device 1 can have a function of preventing the syringe 2 from being accidentally triggered or injected.

[0087] Referring to FIG. 21, the receiving portion 4 has a needle shield return spring 94. The lower end of the needle shield return spring 94 is supported by an inner bead 92 at the lower end of the barrel portion 89 of the needle shield 88, and the upper end of the needle shield return spring 94 is supported by an upper flange portion 74 of the lower flange 73 of the receiving sleeve 63. The needle shield return spring 94 is arranged to be always in a preloaded state of being compressed, and can always push the needle shield 88 outward. Only during injection, the needle shield 88 is pushed upward into the housing 55 of the receiving portion 4 by the injection site of the human body against the return force of the needle shield return spring 94. Then, after the button 38 is pressed, the injection needle 65 of the PFS2 can penetrate the human body. However, when the needle shield 88 is separated from the human body, due to the action of the return force of the needle shield return spring 94, the needle shield 88 immediately returns to the state of protruding from the housing 55 and protects the injection needle 65 therein.

[0088] Next, the cap removal portion 5 of the automatic injection device 1 and its main components will be exemplarily described with reference to FIGS. 22A to 23.

[0089] The cap removal portion 5 is used to remove the needle cap 6 of the PFS2 before injection. The cap removal portion 5 has a cylindrical connection portion 95 that opens upward and fits onto the outer peripheral surface of the lower portion of the housing 55 of the receiving portion 4. The connection portion 95 has, on its inner peripheral surface, a convex portion (not shown) that engages with an engaging concave portion (not shown) on the outer peripheral surface of the lower portion of the housing 55 of the receiving portion 4, or vice versa. The convex portion and the engaging concave portion can form a male-female fit. When the cap removal portion 5 is attached to the receiving portion 4, the convex portion is fitted into the engaging concave portion, and at the same time, a click sound is generated to inform the operator that both are attached to a predetermined position.

[0090] The cap removal part 5 further includes an operation flange 96 as an operation end connected to the lower end of the connection part 95. When it is necessary to remove the cap removal part 5 from the receiving part 4 to remove the needle cap 6 of the PFS2, the operator can pull the operation flange 96 by hand, and the cap removal operation can be easily completed.

[0091] The cap removal part 5 has a clamping mechanism 97 for clamping the needle cap 6 of the PFS2. The clamping mechanism 97 is arranged coaxially with the connection part 95 and, for example, substantially overlaps the connection part 95 in the axial direction. A plurality of, here three, claws 98 are sequentially arranged in the upper part in the circumferential direction of the clamping mechanism 97, and slots 99 opening upward are formed between adjacent claws 98, whereby each claw 98 can expand radially outward when receiving a radial force. At the upper end of each claw 98, a boss 100 extending radially inward beyond the inside of the claw 98 is provided, and the inner surface of the boss is formed as an upper inclined surface 101 and a lower horizontal bottom surface 102. When the needle cap 6 of the PFS2 is inserted into the cap removal part 5, the inclined surface 101 of the boss 100 biases the needle cap 6 radially outward against each claw 98, and the needle cap 6 can be pushed into the clamping mechanism 97. After the needle cap 6 completely enters the inside of the clamping mechanism 97, the claws 98 move radially inward based on the elastic restoring force and abut against the horizontal bottom surface 102 with respect to the upper end surface of the needle cap 6. Thereby, when the cap removal part 5 is removed, the claws 98 can remove the needle cap 6 from the PFS2 with the boss 100. The inner diameter defined by the inside of the claws 98 is slightly smaller than the diameter of the needle cap 6 of the PFS2 in order to hold the needle cap 6 more strongly.

[0092] Next, with reference to FIGS. 24A to 24H, the operation procedure and operation principle of the automatic injection device 1 of the present embodiment will be described.

[0093] Step 1: Prepare the automatic injection device 1 and the PFS2.

[0094] Step 2: Separate the operating part 3 and the receiving part 4 of the automatic injection device 1 from each other.

[0095] Step 3: As shown in FIG. 24A, push the energy storage rod 27 of the moving member 26 of the operating part 3 into the housing 7 of the operating part 3 to compress the operating spring 35 and impart energy. Thereby, the lower end surface of the sector tab 37 of the moving member 26 abuts against the holding surface 45 of the holding part 44 of the button 38 from above, the moving member 26 is held by the button 38, and since the pressing prevention lever 48 is in the prevention position based on the return force of the pressing prevention spring 51, it is prevented that the button 38 is accidentally pressed and the moving member 26 is accidentally released.

[0096] Step 4: Referring to FIG. 24B, fit the PFS2 into the receiving part 4. Thereby, the two horizontal tabs 67 of the injection tube 64 of the PFS2 abut against the upper flange 66 of the receiving sleeve 63, the needle cap 6 of the PFS2 is inserted into the clamping mechanism 97 of the cap removing part 5, and the needle shield return spring 94 is at its maximum length in the initial state.

[0097] Step 5: Referring to FIG. 24C, connect the operating part 3 and the receiving part 4 to each other.

[0098] Step 6: Operate the operation handle 84 of the injection depth adjustment assembly to adjust the desired injection depth.

[0099] Step 7: Referring to FIG. 24D, remove the cap removing part 5 from the receiving part 4 and remove the needle cap 6 of the PFS2. Thereby, the needle shield 88 of the receiving part 4 projects from the housing 55, and the injection needle 65 is not visible from the outside.

[0100] Step 8: Referring to FIG. 24E, press the lower end of the auto-injector 1 with the cap removal part removed against the injection site of the human body. Here, the needle shield 88 is pushed into the housing 55 against the elastic force of the needle shield return spring 94. When the needle shield 88 is pushed into the housing 55 of the receiving part 4 at the injection site of the human body, at the same time, the trigger piece 93 of the needle shield 88 is biased at its upper end, moving the lower operating end 54 of the pressing prevention lever 48 upward. As a result, the pressing prevention lever 48 moves upward from its blocking position to its release position, and the button 38 is in a state where it can be pressed.

[0101] Step 9: Press the button 38 to release the moving member 26 and start the auto-injection process.

[0102] The auto-injection process can be divided into two stages: a puncture process and a drug injection process.

[0103] After the button 38 is pressed, first, the puncture process is automatically performed. Referring to FIG. 24F, the moving member 26 moves downward due to the return force of the actuating spring 35. The moving member 26 presses the upper end surface 32a of the injection rod 32 of the PFS2, driving the entire PFS2 downward. The injection needle 65 begins to puncture the human body, and the injection tube 64 moves downward together with the receiving sleeve 63 against the elastic force of the needle shield return spring 94. The puncture process is performed until the stopper bulge 79 of the depth adjustment assembly provided on the receiving sleeve 63 stops at the corresponding step portion 82 of the fitting stopper 80 provided on the housing 55 of the receiving part 4, thereby reaching a predetermined puncture depth such as the completion state of the puncture process as shown in FIG. 24F. When the puncture process is completed, the mark 71 of the receiving sleeve 63 moves into the viewing window 62 and can be seen by the operator. During the puncture process, the injection rod 32, the injection tube 64, the injection needle 65, and the moving member 26 of the PFS2 and the receiving sleeve 63 move downward together, and the injection rod 32 and the moving member 26 do not move or hardly move relative to the injection tube 64 and the receiving sleeve 63 respectively. The needle shield return spring 94 can also play a role in buffering the puncture impact during the puncture process.

[0104] The drug injection process is automatically performed immediately after the puncture process. Referring to FIG. 24G, during the drug injection process, the receiving sleeve 63, and thus the injection tube 64 and the injection needle 65, cannot move downward due to the stop of the depth adjustment assembly, and the moving member 26 can continue to push down the injection rod 32, whereby the injection rod 32 injects the drug into the human body. The drug injection process is performed until the lower end surface of the injection rod 32 abuts against and stops at the lower end surface of the inner cavity of the injection tube 64, whereby the injection rod 32 completely pushes the drug from the injection tube 64 into the human body, and as shown in FIG. 24G, the drug injection process is completed. When the drug injection process is completed, the mark 30 of the energy storage rod 27 of the moving member 26 moves into the viewing window 62 and becomes visible to the operator. Thereby, the mark 71 of the receiving sleeve 63 and the mark 30 of the energy storage rod 27 of the moving member 26 are arranged horizontally, side by side, or in a straight line, so that the operator can know that the drug injection process is completed.

[0105] Step 10: Referring to FIG. 24H, pull out the injection needle 65 from the human body. Thereby, the needle shield 88 is automatically and quickly discharged from the housing 55 based on the return force of the needle shield return spring 94 to shield the injection needle 65. At this point, the injection is completed. Throughout the entire injection process, the operator cannot see the injection needle 65.

[0106] Step 11: Separate the operating part 3 and the receiving part 4 of the automatic injection device 1 again, discharge the used PFS2 from the receiving part 4 as garbage, and then connect the operating part 3, the receiving part 4, and the cap removal part 5 of the automatic injection device 1 to each other to perform the next injection.

[0107] The above describes the process of one use of the automatic injection device 1. However, the automatic injection device 1 of the present disclosure can repeat the above use process many times and can realize the feature of reusability.

[0108] Advantages of the automatic injection device 1 according to the present disclosure include, for example, that the automatic injection device 1 can realize automatic injection of the drug in the syringe and is reusable; the structure of the automatic injection device 1 is simple and the number of components is small, and among the components, there is one component that performs different functions. The automatic injection device 1 is provided with pressing block mechanisms 48 and 93 for preventing the operator from accidentally operating the button 38. The automatic injection device 1 is equipped with a needle shield mechanism 89 and 94 for preventing the injection needle 65 from accidentally injuring the human body and helping the operator overcome the fear of the injection needle. The automatic injection device 1 is provided with a cap removal mechanism 5 for the needle cap 6 of the PFS2, and can easily remove the needle cap 6 of the PFS2 which is difficult to remove by hand alone. The automatic injection device 1 is equipped with an injection process visual confirmation mechanism 62, 30, 71 that can indicate to the operator that the injection has been completed.

[0109] The present disclosure can include any feature or combination of features, or general concepts thereof, implicitly or explicitly disclosed in this specification, and is not limited to the defined scope listed above. Any element, feature, and / or structural arrangement described in this specification can be combined in any suitable way.

[0110] The specific embodiments disclosed above are merely illustrative, and it is obvious to those skilled in the art who benefit from the teachings of this specification that the present disclosure can be modified and implemented in different but equivalent ways. Therefore, it is obvious that changes and modifications can be made to the specific embodiments disclosed above, and all these variations are considered to be included within the scope and spirit of the present disclosure.

Claims

1. An automatic injection device for a syringe, comprising: an actuating part for actuating the syringe, and a receiving part for receiving the syringe, wherein the actuating part and the receiving part are detachably connected to each other, the actuating part comprising: an accumulator capable of accumulating energy and releasing the accumulated energy, a trigger mechanism for triggering the energy release of the accumulator, and a moving member capable of moving towards the receiving part to actuate the syringe in the receiving part to execute an automatic injection process when the accumulator releases the energy.

2. The automatic injection device according to claim 1, wherein the accumulator can accumulate energy by moving the moving member away from the receiving part.

3. The automatic injection device according to claim 1, wherein the actuating part has a support, and the moving member is axially movable relative to the support.

4. The automatic injection device according to claim 3, wherein the support is provided with a protruding guide strip, and the moving member is provided with a guide groove cooperating with the protruding guide strip respectively; or the support is provided with a guide groove, and the moving member is provided with a protruding guide strip cooperating with the guide groove respectively.

5. The automatic injection device according to claim 3, wherein the accumulator is configured as a spring disposed between the support and the moving member.

6. The automatic injection device according to claim 3, wherein the actuating part includes a housing, the support is substantially disposed in the housing and fixedly connected to the housing.

7. The automatic injection device according to claim 3, wherein the trigger mechanism is configured as a button having a pressing part outside the support and a pivoting part inside the support, and the pivoting part is pivotally supported by the support.

8. The automatic injection device according to claim 7, wherein the button is provided with a holding part on the pivoting part, the moving member is provided with a tab, the moving member is movable until the tab is located above the holding part, and is held by the holding part.

9. The automatic injection device according to claim 7, wherein the actuating part has a pressing prevention lever that can be switched between a prevention position for preventing the pressing of the button and a release position for releasing the pressing of the button.

10. The pressing prevention lever includes a pressing prevention portion, the button has two pivoting portions that are parallel to each other and spaced apart, the button includes a pressing prevention portion between the two pivoting portions, and the pressing prevention portion of the pressing prevention lever can prevent the pressing prevention portion of the button at the prevention position and can move into the gap between the two pivoting portions at the release position. The automatic injection device according to claim 9.

11. A spring is provided between the pressing prevention lever and the support body, When no external force is applied to the pressing prevention lever, the spring pushes the pressing prevention lever into the prevention position, When an external force is applied to the pressing prevention lever, the pressing prevention lever can move to the release position against the spring force of the spring. The automatic injection device according to claim 9.

12. The pressing prevention lever includes an operation portion for applying an external force to the pressing prevention lever. The automatic injection device according to claim 11.

13. The operation portion can be guided in the guide groove of the support body. The automatic injection device according to claim 11.

14. The actuating portion includes a torsion spring that presses against the pressing portion of the button on one hand and presses against the support body on the other hand. Thereby, after the button is released, the torsion spring can automatically reset the button. The automatic injection device according to claim 7.

15. The moving member includes at least one energy storage rod, and the moving member can move away from the receiving portion by operating the energy storage rod. The automatic injection device according to claim 2.

16. A pressing piece is provided between the two opposing energy storage rods, and the moving member can press the injection rod of the syringe toward the receiving portion through the pressing piece. The automatic injection device according to claim 15.

17. In order to detachably connect the actuating portion and the receiving portion, the actuating portion includes an L-shaped engaging groove, and the receiving portion includes a locking protrusion configured to cooperate with it, or the actuating portion includes a locking protrusion, and the receiving portion includes an L-shaped engaging groove configured to cooperate with it. The automatic injection device according to claim 1.

18. The receiving part comprises a housing and a receiving sleeve which is in the housing and axially movable relative to the housing, and the receiving sleeve can receive and support the injection tube of the syringe. The automatic injection device according to claim 1.

19. The receiving sleeve comprises a first flange facing the actuating part, and the first flange supports two horizontal tabs of the injection tube of the syringe. The automatic injection device according to claim 18.

20. The first flange comprises a plurality of vertical tabs arranged at intervals in the circumferential direction, and the vertical tabs circumferentially limit the horizontal tabs of the injection tube. The automatic injection device according to claim 19.

21. The receiving sleeve comprises at least two second flanges arranged at intervals continuously in the axial direction, and the second flanges can be axially guided by the housing. The automatic injection device according to claim 18.

22. The housing comprises a viewing window, the moving member comprises a mark, and the receiving sleeve comprises a mark. When the injection is completed, the mark of the moving member and the mark of the receiving sleeve can be seen simultaneously through the viewing window. The automatic injection device according to claim 18.

23. The receiving part comprises an injection depth adjustment assembly capable of presetting the injection depth of the injection needle of the syringe. The automatic injection device according to claim 1.

24. The injection depth adjustment assembly comprises a stopper bulge and a fitting stopper cooperating with the stopper bulge, the fitting stopper comprises a plurality of stepped portions having different heights, and each of the stepped portions can stop the stopper bulge. The automatic injection device according to claim 23.

25. The receiving part comprises a housing and a receiving sleeve which is in the housing and axially movable relative to the housing, the receiving sleeve can receive and support the injection tube of the syringe, the stopper bulge is fixedly arranged on the receiving sleeve, and the fitting stopper is circumferentially movable and axially fixedly arranged on the housing. The automatic injection device according to claim 24.

26. The fitting stopper has an operation handle configured to be operated from the outside of the housing, and the operation handle is movable in a horizontal slot of the housing so as to align a corresponding step portion of the fitting stopper with the stopper bulge. The automatic injection device according to claim 25.

27. The automatic injection device according to claim 26, further comprising a scale provided in the horizontal slot of the housing, the scale indicating a preset injection depth of the injection needle.

28. The receiving portion is provided with a needle shield at its lower end, the needle shield having a needle shield position protruding from the housing and a retracted position retracted into the housing, the needle shield shielding the injection needle of the syringe so that the injection needle of the syringe is not visible, and the needle shield being in the retracted position during injection. The automatic injection device according to claim 18.

29. The needle shield includes a barrel portion having both ends opened so that the injection needle can pass therethrough, and at the needle shield position of the needle shield member, the barrel portion at least circumferentially surrounds the tip of the injection needle of the syringe. The automatic injection device according to claim 28.

30. The automatic injection device according to claim 29, wherein the barrel portion includes a flange that can be stopped at an inner bead at the lower end of the housing.

31. The barrel portion includes an inner bead at the lower end of the barrel portion, and the spring is supported on the inner bead on one hand and on the receiving sleeve on the other hand, and when no external force is applied, the needle shield is always in the needle shield position. The automatic injection device according to claim 29.

32. The needle shield includes an elongated trigger piece, the trigger mechanism is configured as a button, the actuating portion includes a pressing prevention lever configured to be switched between an initial prevention position that prevents pressing of the button and a release position that releases the pressing of the button, the trigger piece extends toward the pressing prevention lever, and the pressing prevention lever is configured to operate the pressing prevention lever to bias the pressing prevention lever from the prevention position to the release position. The automatic injection device according to claim 28.

33. The automatic injection device according to claim 32, wherein when the needle shield is in the needle shield position, the pressing prevention lever is in the prevention position, and when the needle shield is in the retracted position, the pressing prevention lever is in the release position.

34. The automatic injection device according to claim 1, further comprising a cap removal part for removing the needle cap of the syringe, wherein the cap removal part is detachably connected to the receiving part.

35. The automatic injection device according to claim 34, wherein the cap removal part includes a cylindrical connection part that opens toward the receiving part and is configured to be fitted onto the outer peripheral surface of the receiving part.

36. The connection part includes convex points on the inner peripheral surface of the connection part, and the receiving part includes engaging recesses on the outer peripheral surface of the receiving part, or The receiving part includes convex points on the peripheral surface of the receiving part, and the connection part includes engaging recesses on the inner peripheral surface of the connection part. The automatic injection device according to claim 35.

37. The automatic injection device according to claim 35, wherein the cap removal part includes an operation flange connected to the lower end of the connection part.

38. The cap removal part has a clamping mechanism for clamping the needle cap of the syringe. The clamping mechanism has a plurality of claws arranged continuously in the circumferential direction, and the claws are configured to clamp the needle cap and act on the needle cap from behind the needle cap. The automatic injection device according to claim 34.

39. The automatic injection process according to claim 18 includes a puncture process in which the receiving sleeve moves axially with respect to the housing, and a subsequent drug injection process in which the receiving sleeve does not move axially with respect to the housing.

40. The automatic injection device according to claim 1 is reusable.

Images