Injection device

Abstract

The invention relates to an injection device which comprises a machine shell, a piston rod, a guide ring, a trigger piece and an elastic piece, and the machine shell can drive the guide ring to push a pricking needle of an injection liquid container to move in the injection process; the piston rod is used for pushing a piston in the injection container to move; the guide ring is used for executing needling motion and driving the piston rod to move relative to the trigger piece; the guide ring sleeves the piston rod and is provided with a guide groove for guiding the piston rod to do injection motion; the trigger piece sleeves the guide ring and is provided with a trigger structure; a first protrusion penetrating out of the outer wall of the guide ring is arranged on the periphery of the piston rod. The piston rod enters the guide groove of the guide ring through the trigger structure and performs injection movement under the elastic action of the elastic piece; a first positioning rib is further arranged on the inner wall of the triggering piece and located between the far-body end of the triggering piece and the triggering structure. According to the technical scheme, the fault occurrence rate can be reduced.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and particularly to an injection device. Background Art

[0002] An auto-injector pen, as a commonly used medical device, can replace manual needle insertion, injection, etc. to accurately extrude the required dose. In existing auto-injector pens, there can be two stages: a needle insertion movement and an injection movement, to simplify the structure of the injector pen. Among them, the injection movement is automatically triggered when the needle insertion movement reaches a certain stage.

[0003] However, existing auto-injector pens often malfunction before and after the trigger of the injection movement. Summary of the Invention

[0004] In view of this, the present application provides an injection device to solve at least one problem in the background art.

[0005] To achieve the above object, the technical solution of the present application is realized as follows:

[0006] An embodiment of the present application provides an injection device, including a housing, a piston rod, a guiding ring, a trigger member, and an elastic member, wherein:

[0007] The housing includes a proximal end close to the target organism and a distal end opposite thereto; the housing can drive the guiding ring to push the injection solution container in the needle insertion movement in the first direction during injection;

[0008] The piston rod is used to perform the injection movement in the first direction during injection, and push the piston in the injection solution container to move;

[0009] The guiding ring is used to perform the needle insertion movement, and drive the movement of the trigger member of the piston rod, and then be triggered by the trigger member to perform the injection movement; the guiding ring is sleeved on the piston rod, and is provided with a guiding groove for guiding the piston rod to perform the injection movement;

[0010] The trigger member is sleeved on the guiding ring, and is provided with a trigger structure for guiding the piston rod to rotate by a first preset angle around the first direction during injection, and the trigger structure is an inclined surface or a curved surface; a first protrusion that cooperates with the trigger structure and penetrates through the outer wall of the guiding ring is provided on the outer periphery of the piston rod;

[0011] A first positioning rib is further provided on the inner wall of the trigger member, and the first positioning rib is located between the distal end of the trigger member and the trigger structure; in the case where the guiding ring performs the needle insertion movement, the first positioning rib abuts against the first protrusion circumferentially to limit the rotation of the piston rod.

[0012] Optionally, the first positioning rib extends from the distal end of the trigger member towards the other end.

[0013] Optionally, at the part where the proximal end of the first positioning rib abuts against the first protrusion, there is a first preset structure for reducing the movement resistance of the first protrusion.

[0014] Optionally, the first protrusion is provided with a second preset structure that cooperates with the first preset structure.

[0015] Optionally, the first preset structure is an arc surface and / or an inclined surface; the second preset structure is an arc surface and / or an inclined surface that cooperates with the first preset structure.

[0016] Optionally, the inner wall of the trigger member is provided with a first positioning groove, and the outer wall of the guiding ring is provided with a second positioning rib that cooperates with the first positioning groove to limit the rotation of the guiding ring relative to the trigger member.

[0017] Optionally, the first positioning groove is formed by at least three ribs protruding from the inner wall of the trigger member, and one of the ribs near the distal end of the trigger member forms the triggering structure.

[0018] Optionally, the guiding ring is further provided with a second positioning groove, the second positioning groove is circumferentially spaced from the guiding groove by a first preset angle and is circumferentially connected; before the piston rod performs the injection movement, the first protrusion is located in the second positioning groove; after the piston rod rotates the first preset angle around the first direction, the first protrusion moves from the second positioning groove to the guiding groove, and the piston rod starts the injection movement.

[0019] Optionally, the injection device further includes a needle cap and a tube cap; the needle cap is sleeved on the proximal end of the injection liquid container to cover the injection needle; the tube cap is sleeved on the proximal end of the housing to seal the proximal end of the housing; the tube cap and the needle cap are axially linked.

[0020] Optionally, the injection device further includes an injection liquid installation chamber, the injection liquid installation chamber has a second accommodation cavity capable of accommodating the injection liquid container, and at least part of the side wall of the second accommodation cavity is made of a transparent material.

[0021] The injection device provided by the embodiment of the present application includes: a housing, a piston rod, a guiding ring, a trigger member, and an elastic member, wherein: the housing includes a proximal end close to the target organism and an opposite distal end; the housing can drive the guiding ring to push the injection liquid container in a needle-inserting movement in a first direction during injection; the piston rod is used to perform the injection movement in the first direction during injection, and push the piston in the injection liquid container to move; the guiding ring is used to perform the needle-inserting movement and drive the movement of the piston rod trigger member, and then be triggered by the trigger member to perform the injection movement; the guiding ring is sleeved on the piston rod and is provided with a guiding groove for guiding the piston rod to perform the injection movement; the trigger member is sleeved on the guiding ring and is provided with a trigger structure for guiding the piston rod to rotate by a first preset angle around the first direction during injection, and the trigger structure is an inclined surface or a curved surface; a first protrusion that cooperates with the trigger structure and penetrates through the outer wall of the guiding ring is provided on the outer periphery of the piston rod; a first positioning rib is further provided on the inner wall of the trigger member, and the first positioning rib is located between the distal end of the trigger member and the trigger structure; in the case where the guiding ring performs the needle-inserting movement, the first positioning rib abuts against the first protrusion circumferentially to limit the rotation of the piston rod. It can be seen that in the injection device of the embodiment of the present application, by providing the first positioning rib on the inner wall of the trigger member, in the case where the guiding ring performs the needle-inserting movement, the first positioning rib abuts against the first protrusion circumferentially to limit the rotation of the piston rod; making the movement of the piston rod more stable and reducing the failure rate. Therefore, the injection device of the embodiment of the present application can reduce the failure rate.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. Description of the Drawings

[0023] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0024] Figure 1 is a schematic diagram of the injection device provided by the embodiment of the present application;

[0025] Figure 2 is an exploded view (explosion diagram) of the injection device provided by the embodiment of the present application;

[0026] Figure 3 is a schematic diagram of the piston rod in the injection device provided by the embodiment of the present application;

[0027] Figure 4 is a schematic view of the guiding ring in the injection device provided by the embodiment of the present application Figure 1 ;

[0028] Figure 5 Schematic diagram of the trigger in the injection device provided by the embodiment of the present application Figure 1 ;

[0029] Figure 6 Schematic diagram of the trigger in the injection device provided by the embodiment of the present application Figure 2 ;

[0030] Figure 7 Schematic diagram of the elastic member bracket in the injection device provided by the embodiment of the present application;

[0031] Figure 8 Schematic diagram of the piston rod in the injection device provided by the embodiment of the present application before being triggered to perform the injection movement;

[0032] Figure 9 is Figure 8 Partial enlarged schematic diagram at position A in

[0033] Figure 10 Schematic diagram of the piston rod in the injection device provided by the embodiment of the present application after being triggered to perform the injection movement;

[0034] Figure 11 is Figure 10 Partial enlarged schematic diagram at position B in

[0035] Figure 12 Schematic diagram of the guide ring in the injection device provided by the embodiment of the present application Figure 2 。

[0036] Explanation of reference numerals:

[0037] 10. Housing; 11. Tube cap; 12. Tube body; 13. End cap; 20. Piston rod; 21. First protrusion; 211. Second inclined surface; 30. Guide ring; 31. Guide groove; 32. Second positioning rib; 33. Second positioning groove; 34. First clamping groove; 40. Trigger; 41. Trigger structure; 42. First positioning rib; 421. First inclined surface; 43. First positioning groove; 51. Elastic member; 52. Elastic member bracket; 521. Top cover; 522. Limit post; 523. First tongue; 70. Injection liquid container; 71. Piston; 72. Bottle body; 73. Injection needle; 731. Needle head cover; 80. Needle protection sleeve. Detailed implementation manners

[0038] To make the technical solutions and beneficial effects of this application more obvious and understandable, the following provides a detailed description by listing specific embodiments. For the sake of brevity, some prior arts related to the embodiments of this application but having little relation to the innovative points of this application may not be introduced in the embodiments of this application. Readers may refer to the relevant prior arts, such as the invention patent with the publication number CN116942962B.

[0039] In this application, the drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical and scientific fields to which this application belongs.

[0040] In the description of this application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of simplifying the description of this application, rather than indicating that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to this application.

[0041] In this application, the terms "first" and "second" are only used for the purpose of clear description and cannot be understood as indicating the relative importance of the indicated features or the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" can clearly include at least one of such features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly defined, the terms "install", "connect", "join", "fix", "set", etc. should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can also be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In this application, unless otherwise clearly defined, when the first feature is "on", "above", "over", or "upon" the second feature, or "under", "beneath", "below", or "underneath" the second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact through an intermediate medium. Moreover, when the first feature is "above", "over", or "upon" the second feature, the first feature may be directly above or obliquely above the second feature, or it may simply mean that the horizontal height of the first feature is higher than the horizontal height of the second feature. When the first feature is "under", "beneath", "below", or "underneath" the second feature, the first feature may be directly below or obliquely below the second feature, or it may simply mean that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0044] To thoroughly understand this application, detailed steps and structures of preferred embodiments will be presented in the following description to illustrate the technical solutions of this application. However, in addition to the preferred embodiments, this application may also have other implementation manners.

[0045] In view of the technical problems in the related art, an embodiment of this application provides an injection device. Referring to Figure 1 and Figure 2 , the injection device includes a housing 10, a piston rod 20, a guide ring 30, a trigger 40, and an elastic member 51, wherein:

[0046] The housing 10 includes a proximal end close to the target organism and an opposite distal end; the housing 10 can drive the guide ring 30 to push the injection liquid container 70 in a first direction for a needle insertion movement during injection;

[0047] It can be understood that the proximal end is the end close to the target organism during injection, and the distal end is the opposite end. Similarly, other components can also be divided into a proximal end and a distal end according to the direction during injection.

[0048] Specifically, the housing 10 has a first accommodation cavity to accommodate components such as the piston rod 20, the guide ring 30, the trigger 40, and the elastic member 51.

[0049] The first direction may be the axial direction of the injection liquid container 70. Since the piston rod 20, the housing 10, etc. are also arranged corresponding to the injection liquid container 70, therefore, the first direction may also be the axial direction of components such as the piston rod 20 and the housing 10.

[0050] The piston rod 20 is used to perform an injection movement in the first direction during injection, and push the piston 71 in the injection liquid container 70 to move; the injection movement is a movement along the first direction;

[0051] Understandably, the injection liquid container 70 can be a medicine bottle filled with liquid medicine. The injection liquid container 70 can include a bottle body 72, a piston 71, and an injection needle 73.

[0052] Understandably, the movement of the piston 71 refers to the movement within the injection liquid container 70. The movement of the piston 71 can squeeze the injection liquid within the injection liquid container 70 to flow out towards the outlet end, for example, flow out from the injection needle 73.

[0053] The guiding ring 30 is used to perform the needle insertion movement and drive the piston rod 20 to move relative to the trigger member 40, and then the injection movement is triggered by the trigger member 40; the guiding ring 30 is sleeved on the piston rod 20 and is provided with a guiding groove 31 for guiding the piston rod 20 to perform the injection movement, refer to Figure 4 ;

[0054] Understandably, the needle insertion movement is the movement of inserting the injection needle 73 of the injection liquid container 70 into the target organism, and the needle insertion movement is a movement along the first direction.

[0055] Specifically, the distal end of the guiding ring 30 axially abuts against the housing 10. During injection, the housing 10 moves towards the target organism along the first direction, driving the guiding ring 30 to move in the first direction.

[0056] Specifically, before the piston rod 20 enters the injection movement, the movement of the guiding ring 30 in the first direction can drive the piston rod 20 to move in the first direction, that is, move relative to the trigger member 40.

[0057] After the piston rod 20 enters the injection movement, it can perform the injection movement along the direction of the guiding groove 31. Through the guiding groove 31, the moving direction of the piston rod 20 can be made more stable. Specifically, the guiding groove 31 extends along the first direction.

[0058] The trigger member 40 is sleeved on the guiding ring 30 and is provided with a trigger structure 41 for guiding the piston rod 20 to rotate by a first preset angle around the first direction during injection, and the trigger structure 41 is an inclined surface or a curved surface; a first protrusion 21 that cooperates with the trigger structure 41 and penetrates the outer wall of the guiding ring 30 is provided on the outer periphery of the piston rod 20, refer to Figure 3 ; after the piston rod 20 rotates by the first preset angle, it enters the guiding groove 31 of the guiding ring 30 and performs the injection movement under the elastic force of the elastic member 51;

[0059] Specifically, the triggering structure 41 is an inclined surface or an arc surface. When the piston rod 20 moves relative to the trigger 40, the first protrusion 21 abuts against the inclined surface or the arc surface and moves along the extension direction of the inclined surface or the arc surface, causing the piston rod 20 to rotate by a first preset angle in a first direction. The first preset angle can be 10 degrees to 40 degrees.

[0060] Specifically, the first preset angle can be 20 degrees.

[0061] In this embodiment, the triggering structure 41 is an inclined surface. Refer to Figure 5 and Figure 6 .

[0062] It can be understood that the injection movement of the piston rod 20 is formed by the elastic force of the elastic member 51. In this way, in addition to the simpler operation of the user, the injection process is also relatively stable and will not be affected by improper force application of the user.

[0063] Specifically, one end of the elastic member 51 abuts against the piston rod 20. Before injection, the elastic member 51 is in a compressed state, but it cannot exert elastic force because the axial position of the piston rod 20 is restricted. After the piston rod 20 rotates by the first preset angle, the first protrusion 21 of the piston rod 20 enters the guiding groove 31, and the axial position restriction is released. Under the elastic force of the elastic member 51, the piston rod 20 moves along the direction of the guiding groove 31 to perform the injection movement.

[0064] Specifically, the injection device further includes an elastic member bracket 52 that restricts the elastic member 51. The proximal end of the elastic member 51 abuts against the piston rod 20, and the distal end abuts against the elastic member bracket 52. Before injection, the elastic member 51 is compressed between the piston rod 20 and the elastic member bracket 52. After the axial position restriction of the piston rod 20 is released, the elastic force of the elastic member 51 drives the piston rod 20 to move.

[0065] More specifically, refer to Figure 7 , the elastic member bracket 52 includes a top cover 521 and a limiting post 522 connected to the bottom wall of the top cover 521. The elastic member 51 is sleeved on the limiting post 522; the other end of the elastic member 51 abuts against the top cover 521.

[0066] More specifically, the elastic member 51 can be a compression spring. The compression spring can more precisely control the elastic force through parameters such as wire diameter and pitch, and has a low cost.

[0067] Specifically, the injection device further includes a needle protection sleeve 80. The needle protection sleeve 80 is used to circumferentially surround the injection needle 73 of the injection liquid container 70 and abut against the injection site of the target organism during injection;

[0068] That is, the needle protection sleeve 80 is a support for the user to apply force. After the needle protection sleeve 80 abuts against the injection site of the target organism, the user can apply force to the housing 10 with this as a support, and the housing 10 moves towards the target organism, that is, moves relative to the needle protection sleeve 80, driving the injection needle 73 of the injection liquid container 70 to protrude from the needle protection sleeve 80 and penetrate into the target organism. And because the needle protection sleeve 80 does not move, the lateral position of the needle is relatively stable, and it can penetrate into the injection site relatively accurately without skew or deviation.

[0069] A first positioning rib 42 is further provided on the inner wall of the trigger member 40. The first positioning rib 42 is located between the distal end of the trigger member 40 and the trigger structure 41; in the case where the guiding ring 30 performs the needle insertion movement, the first positioning rib 42 abuts against the first protrusion 21 circumferentially to limit the rotation of the piston rod 20.

[0070] In the prior art, before the piston rod 20 contacts the trigger structure 41, circumferential rotation rarely occurs, so a corresponding structure for restricting the relative rotation of the piston rod 20 is not provided. However, the applicant of the present application has found that before contacting the trigger structure 41, rotation of the piston rod 20 may still occur with a certain probability during use, which may cause the injection process to advance or prevent injection. Therefore, setting the first positioning rib 42 can reduce the instability during use.

[0071] A plurality of first positioning ribs 42 and first protrusions 21 can be provided circumferentially, so that the injection movement is more stable.

[0072] In this embodiment, two first positioning ribs 42 and first protrusions 21 can be provided circumferentially and are evenly distributed, that is, symmetrically arranged. In this way, not only can the injection movement be more stable, but the manufacturing cost is also low.

[0073] To enable the reader to more clearly understand the injection device of the embodiment of the present application, based on the preliminary introduction of the structure above, the working process and action principle of the injection device of the embodiment of the present application will be briefly introduced below. The working process of the injection device mainly includes two stages: needle insertion and injection, which will be introduced as follows:

[0074] 1) Needle insertion. The user holds the housing 10 and abuts the needle protection sleeve 80 against the injection site of the target organism. Then, force is applied to push the housing 10 towards the target organism. Since the needle protection sleeve 80 abuts against the target organism and does not move relative to the target organism, and the injection liquid container 70 can move following the movement of the housing 10, the injection needle 73 of the injection liquid container 70 can protrude from the needle protection sleeve 80 and penetrate into the target organism. After the injection needle 73 penetrates a certain depth, the needle insertion process of the housing is completed.

[0075] 2) Injection. During the needle insertion process, the movement of the housing 10 will also drive the guiding ring 30 and the piston rod 20 to move in the same direction. However, the trigger member 40, like the needle protection sleeve 80, remains stationary relative to the target organism. Therefore, the piston rod 20 moves relative to the trigger member 40. After the needle insertion process is completed, the piston rod 20 rotates a first preset angle around the first direction under the guidance of the trigger structure 41. As a result, the first protrusion 21 of the piston rod 20 enters the guiding groove 31 of the guiding ring 30. Then, under the elastic force of the elastic member 51, the piston rod 20 moves along the direction of the guiding groove 31, pushing the piston 71 in the injection liquid container 70 to move, squeezing out the injection liquid for injection. When the piston rod 20 moves to a preset position, such as the piston 71 abuts against the bottom of the injection liquid container 70, or the first protrusion 21 abuts against the bottom of the guiding groove 31, etc., the piston rod 20 is blocked and cannot move further, and the injection process is completed. The position change of the first protrusion 21 of the piston rod 20 before and after being triggered is referenced Figures 8 - 11 。

[0076] In the injection device according to the embodiment of the present application, by providing a first positioning rib 42 on the inner wall of the trigger member 40, when the guiding ring 30 performs the needle insertion movement, the first positioning rib 42 abuts against the first protrusion 21 circumferentially to limit the rotation of the piston rod 20; this makes the movement of the piston rod 20 more stable and reduces the failure rate.

[0077] In some other embodiments of the present application, the first positioning rib 42 extends from the distal end of the trigger member 40 to the other end.

[0078] That is, before the piston rod 20 enters the injection movement, the first protrusion 21 always abuts against the first positioning rib 42, making the state of the piston rod 20 more stable.

[0079] In some other embodiments of the present application, a first preset structure for reducing the movement resistance of the first protrusion 21 is provided at the portion where the proximal end of the first positioning rib 42 abuts against the first protrusion 21.

[0080] The applicant of the present application found during research and development that during the use of an injection pen by a user, various unexpected situations may occur, resulting in the interruption of the needle insertion movement or the injection movement. For example, when the injection pen is about to trigger the injection movement, the user suddenly releases the hand, causing the trigger structure 41 and the piston rod 20 to get stuck, unable to continue the injection or withdraw, making the injection pen unusable. Although this is an occasional situation, it brings a certain risk to the user during use and urgently needs improvement.

[0081] Therefore, in the further R & D of the applicant, it is found that since generally during injection, the user continuously pushes the casing 10, the situation where the user suddenly releases the hand is relatively rare. When the R & D designers conduct sample tests, the situation of suddenly releasing the hand does not occur either. Therefore, the problem that the resistance is relatively large when the proximal end of the first positioning rib 42 abuts against the first protrusion 21 of the piston rod 20 when the first protrusion 21 of the piston rod 20 enters or exits is not noticed. Based on this discovery, the applicant proposes the above technical solution.

[0082] In this embodiment, the specific structure of the first preset structure is not limited, as long as it can reduce the movement resistance of the first protrusion 21. In some other embodiments of the present application, the first protrusion 21 is provided with a second preset structure that cooperates with the first preset structure.

[0083] Through the second preset structure, it can better cooperate with the first preset structure, making it more effective to reduce the resistance when the first protrusion 21 enters or exits.

[0084] In some other embodiments of the present application, the first preset structure is an arc surface and / or an inclined surface; the second preset structure is an arc surface and / or an inclined surface that cooperates with the first preset structure.

[0085] It can be understood that the first preset structure can be an arc surface or an inclined surface, or a combination of a part of an arc surface and a part of an inclined surface. Similarly, the second preset structure can also be an arc surface or an inclined surface that cooperates with the first preset structure, or a combination of a part of an arc surface and a part of an inclined surface.

[0086] Specifically, in this embodiment, the first preset structure and the second preset structure are inclined surfaces that cooperate with each other, which are the first inclined surface 421 and the second inclined surface 211 respectively. Refer to Figure 3 and Figure 5 . In this way, while achieving the effect of reducing resistance, the manufacturing cost is low.

[0087] In some other embodiments of the present application, the inner wall of the trigger member 40 is provided with a first positioning groove 43, and the outer wall of the guiding ring 30 is provided with a second positioning rib 32 that cooperates with the first positioning groove 43 to limit the rotation of the guiding ring 30 relative to the trigger member 40.

[0088] In the prior art, there is only an axial relative movement between the trigger member 40 and the guiding ring 30, and the circumferential rotation rarely occurs. Therefore, the corresponding structure for restricting relative rotation is not provided. The applicant of the present application finds in a large number of tests that it is also possible for the two to rotate relative to each other. Therefore, by providing the first positioning groove 43 and the second positioning rib 32, the instability during use can be reduced.

[0089] In some other embodiments of the present application, the first positioning groove 43 is formed by at least three ribs protruding from the inner wall of the trigger member 40, and one of the ribs near the distal end of the trigger member 40 forms the trigger structure 41.

[0090] The first positioning groove 43 is formed by the ribs, which can simplify the structure and manufacturing process. In addition, one of the ribs forms the trigger structure 41, which further simplifies the structure.

[0091] In some other embodiments of the present application, the guiding ring 30 is further provided with a second positioning groove 33. The second positioning groove 33 is circumferentially spaced from the guiding groove 31 by a first preset angle and is circumferentially connected; before the piston rod 20 performs the injection movement, the first protrusion 21 is located in the second positioning groove 33; after the piston rod 20 rotates by the first preset angle in the first direction, the first protrusion 21 moves from the second positioning groove 33 to the guiding groove 31, and the piston rod 20 starts the injection movement.

[0092] It can be understood that the purpose of setting the second positioning groove 33 is to limit the circumferential position of the piston rod 20 during the process of the guiding ring 30 pushing the injection liquid container 70 to perform the needle insertion movement, and to prevent the piston rod 20 from falling into the guiding groove 31. Specifically, the proximal end of the second positioning groove 33 can abut against the first protrusion 21 during the needle insertion movement to resist the elastic force acting on the piston rod 20 by the elastic member 51.

[0093] In some other embodiments of the present application, referring to Figure 12 , a first clamping groove 34 is provided on the side wall of the guiding ring 30, and a first clamping tongue 523 extending into the first clamping groove 34 is provided on the outside of the elastic member bracket 52. Through the cooperation of the first clamping groove 34 and the first clamping tongue 523, and the elastic force of the elastic member 51, an axial linkage relationship is established between the elastic member bracket 52 and the guiding ring 30.

[0094] Specifically, one end of the elastic member 51 abuts against the piston rod 20, and the elastic force acts on the piston rod 20, causing the piston rod 20 to tend to move towards the target organism. The other end of the elastic member 51 abuts against the elastic member bracket 52, and the elastic force acts on the elastic member bracket 52, causing the elastic member bracket 52 to tend to move away from the target organism. Therefore, the first clamping tongue 523 can abut against the first clamping groove 34 under the action of the elastic force, so as to establish an axial linkage relationship between the elastic member bracket 52 and the guiding ring 30.

[0095] As described above, since one end of the elastic member 51 abuts against the piston rod 20 and the other end abuts against the elastic member bracket 52, the piston rod 20 and the elastic member bracket 52 are also axially linked. In this way, the guide ring 30 and the piston rod 20 are also in an axially linked relationship. During the needle insertion movement, the relative positions of the piston rod 20 and the injection liquid container 70 remain unchanged, so as to complete the preset injection during the injection movement.

[0096] In some other embodiments of the present application, the injection device further includes a needle cover 731 and a tube cap 11; the needle cover 731 is sleeved on the proximal end of the injection liquid container 70 to cover the injection needle 73; the tube cap 11 is sleeved on the proximal end of the housing 10 to seal the proximal end of the housing 10; the tube cap 11 and the needle cover 731 are axially linked.

[0097] In this way, in addition to the needle protection sleeve 80 surrounding the injection needle 73 of the injection liquid container 70 circumferentially, the injection needle 73 is also covered by the needle cover 731, making it safer to use.

[0098] The tube cap 11 can protect components such as the needle cover 731 by closing the proximal end of the housing 10.

[0099] The purpose of the axial linkage between the tube cap 11 and the needle cover 731 is that when preparing for injection and removing the tube cap 11, the needle cover 731 can also be removed together, making the operation faster.

[0100] In some other embodiments of the present application, the injection device further includes an injection liquid installation bin (not shown in the figure), the injection liquid installation bin has a second accommodation cavity capable of accommodating the injection liquid container 70, and at least part of the side wall of the second accommodation cavity is made of a transparent material.

[0101] In this way, the radial position of the injection liquid container 70 can be made more stable, and the movement of the injection liquid container 70 also has corresponding structural supports. For example, structures such as guide rails or guide grooves can be provided in the injection liquid installation bin to reduce the movement resistance of the injection liquid container 70. At least part of the side wall of the second accommodation cavity is made of a transparent material, which can make it more convenient for the user to observe the remaining amount of the liquid in the injection liquid container 70 and facilitate continuous injection.

[0102] In some other embodiments of the present application, referring to Figure 2 , the housing 10 includes a tube body 12 and an end cap 13 connected to the distal end of the tube body 12; the end cap 13 abuts against the guide ring 30 in the first direction, and during injection, the end cap 13 pushes the guide ring 30 to move in the first direction.

[0103] Manufacturing the housing 10 by separately manufacturing the tube body 12 and the end cap 13 and then assembling them is beneficial to reducing the manufacturing cost. For example, the structure is simpler after separation, which can simplify the processing.

[0104] Understandably, the end cap 13 is used to close the distal end of the tube body 12, and the end cap 13 abuts against the guiding ring 30 in the first direction. During needle insertion and injection, the movement of the guiding ring 30 in the first direction can be driven by the movement of the housing 10 in the first direction.

[0105] It should be understood that the above embodiments are all exemplary and do not cover all possible implementation manners included in the technical solution of the present application. Without departing from the scope of the disclosure of the present application, various deformations and changes can also be made on the basis of the above embodiments. Similarly, any combination of the technical features of the above embodiments can also be made to form additional embodiments of the present application that may not be clearly described. Therefore, the above embodiments only represent several implementation manners of the present application and do not limit the protection scope of the patent of the present application.

Claims

1. An injection device, characterized in that: It includes a housing, a piston rod, a guide ring, a trigger member and an elastic member, wherein: The housing comprises a proximal end close to the target organism and an opposite distal end; the housing can drive the guide ring to push the injection container in a first direction during injection; The piston rod is used to perform the injection movement in the first direction during injection, pushing the piston in the injection liquid container to move; The guide ring is used to execute the needle-piercing movement and drive the movement of the piston rod trigger member, and then the trigger member triggers the injection movement; the guide ring is sleeved on the piston rod and is provided with a guide groove for guiding the piston rod to perform the injection movement; The trigger member is sleeved on the guide ring and is provided with a trigger structure for guiding the piston rod to rotate around a first direction by a first preset angle during injection, and the trigger structure is an inclined surface or an arc surface; the outer periphery of the piston rod is provided with a first protrusion that cooperates with the trigger structure and passes through the outer wall of the guide ring; The inner wall of the trigger member is also provided with a first positioning rib, which is located between the distal end of the trigger member and the trigger structure; when the guide ring performs the needle-piercing movement, the first positioning rib abuts against the first protrusion from the circumferential direction to limit the rotation of the piston rod.

2. The injection device according to claim 1, characterized in that The first positioning rib extends from the distal end of the trigger member to the other end.

3. The injection device according to claim 1, characterized in that A first preset structure that reduces the movement resistance of the first protrusion is provided at a portion where the proximal end of the first positioning rib abuts against the first protrusion.

4. The injection device according to claim 3, characterized in that The first protrusion is provided with a second preset structure matching with the first preset structure.

5. The injection device according to claim 4, characterized in that The first preset structure is an arcuate surface and / or an inclined surface; the second preset structure is an arcuate surface and / or an inclined surface matching the first preset structure.

6. The injection device according to claim 1, characterized in that The inner wall of the trigger member is provided with a first positioning groove, and the outer wall of the guide ring is provided with a second positioning rib matched with the first positioning groove to limit the rotation of the guide ring relative to the trigger member.

7. The injection device according to claim 6, characterized in that The first positioning groove is surrounded by at least three convex ribs protruding from the inner wall of the trigger member, and one of the convex ribs close to the distal end of the trigger member forms the trigger structure.

8. The injection device according to any one of claims 1 to 7, characterized in that: The guide ring is also provided with a second positioning groove, which is circumferentially spaced from the guide groove by a first preset angle and circumferentially connected; before the piston rod performs the injection movement, the first protrusion is located in the second positioning groove; after the piston rod rotates around the first direction by the first preset angle, the first protrusion moves from the second positioning groove to the guide groove, and the piston rod starts the injection movement.

9. The injection device according to any one of claims 1 to 7, characterized in that: The injection device also includes a needle cover and a tube cap; the needle cover is sleeved on the proximal end of the injection liquid container to cover the injection needle; the tube cap is sleeved on the proximal end of the housing to seal the proximal end of the housing; the tube cap and the needle cover are axially linked.

10. The injection device according to any one of claims 1 to 7, characterized in that: The injection device also includes an injection liquid installation chamber, which has a second accommodating cavity capable of accommodating the injection liquid container, and a side wall of the second accommodating cavity is at least partially made of a transparent material.

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