Excitation and locking structure and injection pen

Abstract

The invention belongs to the technical field of injection pens, and particularly relates to an excitation and locking structure and an injection pen. The excitation and locking structure comprises a pen body, the propelling part is arranged in the pen body in an axial moving manner; the excitation piece is arranged in the pen body, the excitation piece comprises two first elastic tongue parts, and each first elastic tongue part is connected to the outer wall of the pushing piece in a clamped mode; the limiting guide piece is arranged on the outer wall of the excitation piece in a sleeving mode in an axial moving mode, and in the non-excitation state, the first elastic tongue part is limited in the limiting guide piece in the radial direction; the locking piece is located between the excitation piece and the limiting guide piece; wherein during excitation, the limiting guide piece drives the locking piece to axially move in the direction far away from the needle head; the first elastic tongue part is separated from the outer wall of the propelling part after being separated from the limiting of the limiting guide part, so that the propelling part moves towards the needle head.

Description

Technical Field

[0001] This invention belongs to the field of injection pen technology, and particularly relates to the activation and locking structure and the injection pen. Background Technology

[0002] As a drug delivery device, the two-step injection pen aims to simplify the user process through a "press-to-trigger" operation, automatically completing the entire process of needle ejection, drug injection, and needle retrieval / protection, thereby improving user convenience and safety.

[0003] In related technologies, most two-step injection pens on the market currently employ multi-component activation and locking mechanisms, leading to problems such as complex overall structure, poor component stability, and assembly difficulties. Specifically, key elastic elements such as clips are prone to damage during installation due to structural design flaws. Furthermore, during movement, the elastic structure is susceptible to interference with adjacent components, causing technical problems such as jamming or failure.

[0004] Therefore, it is necessary to develop an excitation and locking structure and injection pen that is simplified in structure, highly reliable, and easy to assemble.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Summary of the Invention

[0006] This disclosure provides at least one excitation and locking structure and an injection pen.

[0007] In a first aspect, embodiments of this disclosure provide an activation and locking structure. Including the pen body; A propulsion component, which is axially movable within the pen body; An actuating element is disposed inside the pen body. The actuating element includes two first elastic tongues, each of which is engaged with the outer wall of the propelling element. A limiting guide is axially movable and sleeved on the outer wall of the exciter. In the unexcited state, the first elastic tongue is radially limited within the limiting guide. A locking element is located between the triggering element and the limiting guide element; During activation, the limiting guide causes the locking member to move axially away from the needle tip; After the first elastic tongue disengages from the limiting guide, it moves out of the outer wall of the pusher, so that the pusher moves toward the needle tip.

[0008] In one optional embodiment, two locking platforms are symmetrically arranged inside the limiting guide; The locking member is provided with two second elastic tongues, which are slidably disposed inside the limiting guide member; A sleeve spring is provided between the limiting guide and the locking member; During the excitation process, the limiting guide moves away from the needle, and the sleeve spring is in a compressed state. After the injection is completed, the sleeve spring pushes the limiting guide to move towards the needle, and the second elastic tongue abuts against the locking platform.

[0009] In one optional embodiment, the inner wall of the limiting guide is provided with a first guide groove and a second guide groove, the second guide groove being arranged circumferentially spaced from the first guide groove; In the unactivated state, the outer end of the first elastic tongue abuts against the inner wall of the first guide groove, and the outer end of the second elastic tongue abuts against the inner wall of the second guide groove.

[0010] In one alternative embodiment, the first guide groove is formed with an inwardly protruding first step; The propulsion component has a first groove formed along the axial direction; In the unactivated state, the outer end of the first elastic tongue abuts against the first step, and the inner end of the first elastic tongue is engaged in the first groove.

[0011] In one alternative embodiment, the second guide groove is formed with an inwardly protruding second step; The excitation element includes an excitation sleeve, and the sleeve wall is further provided with a guide groove. The locking member is slidably sleeved on the excitation sleeve, and the second elastic tongue is accommodated in the guide groove; In the unactivated state, the outer end of the second elastic tongue abuts against the second step, and the inner end of the second elastic tongue abuts against the outer wall of the propulsion member in the guide groove. Upon activation, the second elastic tongue slides axially along the guide groove.

[0012] In one optional embodiment, an annular wall platform is provided at the lower end of the excitation sleeve; The locking element includes a locking sleeve; When the injection is completed, the second elastic tongue no longer abuts against the outer wall of the injection component as the propellant moves axially along the needle direction. The sleeve spring pushes the locking sleeve to move axially away from the needle until it hits the annular wall and makes a sound.

[0013] In one alternative embodiment, the locking sleeve has a plurality of reinforcing blocks spaced apart circumferentially on its cylinder wall.

[0014] In one optional embodiment, the outer wall of the excitation sleeve is provided with a plurality of first reinforcing ribs evenly distributed circumferentially, and the first reinforcing ribs extend axially. The second elastic tongue is located between two adjacent first reinforcing ribs.

[0015] In one optional embodiment, two second reinforcing ribs are further provided on the outer wall of the excitation sleeve, each of the second reinforcing ribs extending axially, and the first elastic tongue is provided at the top of the second reinforcing rib; The inner wall of the limiting guide is provided with a first mounting groove that matches the first reinforcing rib and a second mounting groove that matches the second reinforcing rib.

[0016] Secondly, this embodiment also provides an injection pen, comprising: The pen cap is fixedly connected to the actuating element. A pen cap, which is fitted onto the end of the pen body near the tip of the needle.

[0017] The beneficial effects of this invention are that it provides an excitation and locking structure and an injection pen, through the cooperation of an excitation component, a limiting guide component, and a locking component; during excitation, the limiting guide component moves towards the locking component, and the sleeve spring is compressed; after injection, the sleeve spring pushes the limiting guide component towards the needle tip, and the second elastic tongue abuts against the locking platform. This replaces the complex locking mechanism composed of traditional multiple components. This design greatly reduces the number of parts, lowers the failure rate caused by numerous parts, improves the stability of the overall structure and the reliability of the operation, and effectively avoids jamming or failure during movement.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1A perspective view of the deployed state of the excitation and locking structure provided in an embodiment of this disclosure; Figure 2 An axial sectional perspective view of the excitation and locking structure provided in an embodiment of this disclosure; Figure 3 An axial sectional perspective view of the limiting guide and locking member is provided for the embodiments of this disclosure; Figure 4 A perspective view of the locking member and the triggering member provided in the embodiments of this disclosure; Figure 5 A perspective axial cross-sectional view of the limiting guide provided in an embodiment of this disclosure; Figure 6 A perspective view of the locking member provided in an embodiment of this disclosure; Figure 7 A perspective view of the excitation element provided in an embodiment of this disclosure; Figure 8 A perspective view of the propulsion component provided in an embodiment of this disclosure.

[0022] In the picture: 1. Pen body; 10. Pen cap; 11. Needle sleeve; 2. Propulsion component; 21. First groove section; 3. Excitation element; 30. First elastic tongue; 31. Excitation sleeve; 32. Guide groove; 33. Annular wall platform; 34. First reinforcing rib; 35. Second reinforcing rib; 4. Limiting guide; 40. Locking platform; 43. First guide groove; 44. Second guide groove; 45. First step; 46. First mounting groove; 47. Second mounting groove; 48. Second step; 5. Locking element; 50. Second elastic tongue; 52. Locking sleeve; 53. Reinforcing block; 6. Sleeve spring; 7. Lower the pen cap. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0025] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0026] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0027] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0028] Research has found that the two-step injection pen, as a drug delivery device, is designed to simplify the user process through a "press-to-trigger" operation, automatically completing the entire process of needle ejection, drug injection, and needle retrieval / protection, thereby improving user convenience and safety.

[0029] In related technologies, most two-step injection pens on the market currently employ multi-component activation and locking mechanisms, leading to problems such as complex overall structure, poor component stability, and assembly difficulties. Specifically, key elastic elements such as clips are prone to damage during installation due to structural design flaws. Furthermore, during movement, the elastic structure is susceptible to interference with adjacent components, causing technical problems such as jamming or failure.

[0030] Therefore, it is necessary to develop an excitation and locking structure and injection pen that is simplified in structure, highly reliable, and easy to assemble.

[0031] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides an activation and locking structure, including: a pen body 1, a propulsion member 2, an activation member 3, a limiting guide member 4, a locking member 5, and a sleeve spring 6. The pen body 1 is the main housing of the injection pen. A needle sleeve 11 is axially movable within the pen body 1, and the needle sleeve 11 abuts against the limiting guide member 4. The medicine bottle and the injection needle are located within the needle sleeve 11. After the needle sleeve 11 abuts against the patient's skin, it pushes the limiting guide member 4 to move away from the medicine bottle. The propulsion member 2 is axially movable within the pen body 1 and is used to push the rubber stopper inside the medicine bottle to move axially. The activation member 3 is sleeved on the outer wall of the propulsion member 2 and includes two first elastic tongues 30. The first elastic tongues 30 are used to limit the axial displacement of the propulsion member 2. The limiting guide member 4 is axially movable within the outer wall of the activation member 3. The locking member 5 is located between the activation member 3 and the limiting guide member 4, and the sleeve spring 6 is located between the limiting guide member 4 and the locking member 5.

[0035] Reference Appendix Figure 5 The limiting guide 4 has two symmetrically arranged locking platforms 40 inside, each locking platform 40 corresponding to a second elastic tongue 50. The inner wall of the limiting guide 4 has a first guide groove 43 and a second guide groove 44, the second guide groove 44 and the first guide groove 43 being circumferentially spaced apart; wherein, in the unactivated state, the outer end of the first elastic tongue 30 abuts against the inner wall of the first guide groove 43, and the outer end of the second elastic tongue 50 abuts against the inner wall of the second guide groove 44. The first guide groove 43 forms an inwardly protruding first step 45; see attached figure. Figure 2 and Figure 8The propulsion member 2 has a first groove 21 opened along the axial direction; wherein, in the unactivated state, the outer end of the first elastic tongue 30 abuts against the first step 45, and the inner end of the first elastic tongue 30 is engaged in the first groove 21.

[0036] Reference Appendix Figure 6 The locking member 5 is provided with two second elastic tongues 50, which are slidably disposed inside the limiting guide member 4. A sleeve spring 6 is provided between the limiting guide member 4 and the locking member 5. During the arousal process, the limiting guide member 4 moves away from the needle, and the sleeve spring 6 is in a compressed state. After the injection is completed, the sleeve spring 6 pushes the limiting guide member 4 to move towards the needle, and the second elastic tongues 50 abut against the locking platform 40, locking axially upward to prevent the needle sleeve 11 from being unable to be pressed down, thus exposing the needle.

[0037] It should be noted that the reference appendix is ​​attached. Figure 6 The end of the second elastic tongue 50 near the needle tip is formed into an inwardly inclined slope. Correspondingly, the mating surface of the locking table 40 is also formed into an inwardly inclined slope at the same angle as the second elastic tongue 50 during actual processing. After injection, the second elastic tongue 50 abuts against the locking table 40, and the slope abuts against the slope, so that the second elastic tongue 50 has an outwardly opening radial force, preventing it from being squeezed inward and dislodging from the axial limit.

[0038] Reference Appendix Figure 7 and attached Figure 5The second guide groove 44 forms an inwardly protruding second step 48. The excitation element 3 further includes an excitation sleeve 31, and a guide groove 32 is provided on the sleeve wall. The locking element 5 is slidably sleeved on the excitation sleeve 31, and the second elastic tongue 50 is accommodated in the guide groove 32. The locking sleeve 52 of the locking element 5 has multiple reinforcing blocks 53 spaced circumferentially on its sleeve wall to enhance structural strength. The lower end of the excitation sleeve 31 is provided with an annular wall platform 33; the locking element 5 includes a locking sleeve 52; wherein, in the unexcited state, the outer end of the second elastic tongue 50 abuts against the second step 48, and the inner end of the second elastic tongue 50 abuts against the outer wall of the pusher 2 in the guide groove 32. When the injection is completed, the second elastic tongue 50 no longer abuts against the outer wall of the pusher 2 and is squeezed inward. The outer end of the second elastic tongue 50 disengages from the second step 48. The sleeve spring 6 pushes the locking sleeve 52 axially away from the needle (pen cap 10 direction) until it hits the annular wall 33 and produces a sound. The cylinder wall of the locking sleeve 52 is provided with a plurality of reinforcing blocks 53 spaced apart circumferentially. The outer wall of the excitation sleeve 31 is evenly distributed with a plurality of first reinforcing ribs 34 circumferentially, and the first reinforcing ribs 34 extend axially. The second elastic tongue 50 is located between two adjacent first reinforcing ribs 34. The outer wall of the excitation sleeve 31 is also provided with two second reinforcing ribs 35, each of which extends axially. The first elastic tongue 30 is located at the top of the second reinforcing rib 35. The inner wall of the limiting guide 4 is provided with a first mounting groove 46 that matches the first reinforcing rib 34 and a second mounting groove 47 that matches the second reinforcing rib 35. This is to achieve precise guidance during assembly and prevent relative rotation.

[0039] Appendix Figure 4 A perspective view of the locking member 5 and the activating member 3 is shown, illustrating the arrangement of the second elastic tongue 50 within the guide groove 32. The inner wall of the limiting guide member 4 is provided with a first guide groove 43 and a second guide groove 44, with the first guide groove 43 forming a first step 45. The pushing member 2 has a first groove 21 along its axial direction. In the unactivated state, the outer end of the first elastic tongue 30 abuts against the first step 45, and the inner end is engaged with the first groove 21. The outer wall of the activating sleeve 31 is evenly distributed with first reinforcing ribs 34 and second reinforcing ribs 35. The second elastic tongue 50 is located between adjacent first reinforcing ribs 34, and the first mounting groove 46 and the second mounting groove 47 on the inner wall of the limiting guide member 4 respectively match the first reinforcing ribs 34 and 35.

[0040] The working principle of an excitation and locking structure is as follows: like Figure 3As shown, in standby mode: In standby mode, the first step 45 of the limiting guide 4 engages with the outer end of the first elastic tongue 30, and the inner end of the first elastic tongue 30 engages with the first groove 21 of the pusher 2. Simultaneously, the outer end of the second elastic tongue 50 abuts against the inner wall of the second guide groove 44 of the limiting guide 4, and the locking member 5 maintains a relative position with the limiting guide 4 via the sleeve spring 6. At this time, the pusher 2 is limited by the first elastic tongue 30, preventing it from moving axially.

[0041] Injection Trigger: When the needle sleeve 11 contacts the patient's skin, it pushes the limiting guide 4 axially away from the needle (towards the pen cap 10). During activation, the limiting guide 4 drives the locking member 5 downward, and the sleeve spring 6 remains in its factory-pre-compressed state throughout this process, with its length unchanged. After the first elastic tongue 30 disengages from the radial limit of the limiting guide 4, it disengages from the first groove 21 of the pusher 2, releasing the constraint on the pusher 2. The pusher 2 moves towards the needle under the action of the internal spring (not shown in the figure), completing the drug injection.

[0042] After injection, the advance member 2 has moved axially along the needle direction to the end of the injection stroke. The second elastic tongue 50 no longer abuts against the outer wall of the advance member 2. Instead, the second elastic tongue 50 pushes inward, disengaging from the second step 48, thus releasing the radial restriction on the locking member 5. The sleeve spring 6 pushes the locking sleeve 52 of the locking member 5 to strike the annular wall 33 of the excitation sleeve 31, producing a crisp sound to indicate to the user that the injection is complete. Next, the sleeve spring 6 pushes the limiting guide 4 to move towards the needle. The second elastic tongue 50 abuts against the locking platform 40, forming an axial lock. In this state, even if the needle sleeve 11 is pressed down again, the second elastic tongue 50 abuts against the locking platform of the limiting guide 4 and cannot move axially, effectively avoiding the problem of needle exposure after injection.

[0043] After the patient moves the injection pen away from the injection site, the sleeve spring 6 pushes the limiting guide 4 to move back towards the needle, causing the needle sleeve 11 to cover the needle.

[0044] Assembly instructions: During assembly, firstly, the excitation sleeve 31 of the excitation component 3 is inserted into the pen body 1, ensuring that the first reinforcing rib 34 is aligned with the first mounting groove 46 of the limiting guide 4, and the second reinforcing rib 35 is aligned with the second mounting groove 47, achieving precise guidance and preventing relative rotation. Then, the locking component 5 is installed, allowing the second elastic tongue 50 to be accommodated within the guide groove 32. The sleeve spring 6 is fitted onto the outer wall of the limiting guide 4, with its two ends abutting against the limiting guide 4 and the locking component 5, respectively. After the pusher 2 is inserted, the first elastic tongue 30 engages with the first groove 21. Finally, the pen cap 10 is fitted onto the upper end of the pen body 1. The entire assembly process is simple and efficient, avoiding damage to the elastic components.

[0045] At least one embodiment provides an injection pen employing the activation and locking structure described in the above embodiments, including a lower pen cap 7, wherein the activation element 3 is fixedly connected to the lower pen cap 7; and a pen cap 10, wherein the pen cap 10 is sleeved on the end of the pen body 1 adjacent to the needle tip for protecting the internal structure.

[0046] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0048] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An activation and locking structure, comprising a pen body (1), characterized in that, Also includes: A pusher (2) is axially movable within the pen body (1); The exciter (3) is disposed inside the pen body (1). The exciter (3) includes two first elastic tongues (30), each of which is engaged with the outer wall of the pusher (2). The limiting guide (4) is axially movable and sleeved on the outer wall of the exciter (3). When not excited, the first elastic tongue (30) is radially limited inside the limiting guide (4). The locking member (5) is located between the triggering member (3) and the limiting guide member (4); During activation, the limiting guide (4) drives the locking member (5) to move axially away from the needle tip; After the first elastic tongue (30) is disengaged from the limiting guide (4), it disengages from the outer wall of the pusher (2) so that the pusher (2) moves toward the needle tip.

2. The excitation and locking structure as described in claim 1, characterized in that, The limiting guide (4) has two locking platforms (40) symmetrically arranged inside. The locking member (5) is provided with two second elastic tongues (50), which are slidably disposed inside the limiting guide member (4); A sleeve spring (6) is provided between the limiting guide (4) and the locking member (5). During the excitation process, the limiting guide (4) moves away from the needle tip, and the sleeve spring (6) is in a compressed state. After the injection is completed, the sleeve spring (6) pushes the limiting guide (4) to move towards the needle, and the second elastic tongue (50) abuts against the locking platform (40).

3. The excitation and locking structure as described in claim 1, characterized in that, The inner wall of the limiting guide (4) is provided with a first guide groove (43) and a second guide groove (44), and the second guide groove (44) and the first guide groove (43) are arranged circumferentially at intervals. In the unactivated state, the outer end of the first elastic tongue (30) abuts against the inner wall of the first guide groove (43), and the outer end of the second elastic tongue (50) abuts against the inner wall of the second guide groove (44).

4. The excitation and locking structure as described in claim 3, characterized in that, The first guide groove (43) has an inwardly protruding first step (45); The propulsion component (2) has a first groove (21) opened along the axial direction; In the unactivated state, the outer end of the first elastic tongue (30) abuts against the first step (45), and the inner end of the first elastic tongue (30) is engaged in the first groove (21).

5. The excitation and locking structure as described in claim 3, characterized in that, The second guide groove (44) has an inwardly protruding second step (48); The excitation element (3) includes an excitation sleeve (31), and a guide groove (32) is provided on the sleeve wall of the excitation sleeve (31). The locking member (5) is slidably sleeved on the excitation sleeve (31), and the second elastic tongue (50) is accommodated in the guide groove (32); In the unactivated state, the outer end of the second elastic tongue (50) abuts against the second step (48), and the inner end of the second elastic tongue (50) abuts against the outer wall of the pusher (2) in the guide groove (32); When activated, the second elastic tongue (50) slides axially along the guide groove (32).

6. The excitation and locking structure as described in claim 5, characterized in that, The lower end of the excitation sleeve (31) is provided with an annular wall platform (33). The locking element (5) includes a locking sleeve (52); When the injection is completed, the second elastic tongue (50) no longer abuts against the outer wall of the injection member (2) when the pusher (2) moves axially along the needle direction. The sleeve spring (6) pushes the locking sleeve (52) to move axially away from the needle until it hits the annular wall (33) and makes a sound.

7. The excitation and locking structure as described in claim 5, characterized in that, The locking sleeve (52) has multiple reinforcing blocks (53) spaced circumferentially on its cylinder wall.

8. The excitation and locking structure as described in claim 5, characterized in that, The outer wall of the excitation sleeve (31) is evenly distributed with a plurality of first reinforcing ribs (34) along the circumferential direction, and the first reinforcing ribs (34) extend along the axial direction; The second elastic tongue (50) is located between two adjacent first reinforcing ribs (34).

9. The excitation and locking structure as described in claim 6, characterized in that, The outer wall of the excitation sleeve (31) is also provided with two second reinforcing ribs (35), each of the second reinforcing ribs (35) extending axially, and the first elastic tongue (30) is provided on the top of the second reinforcing rib (35); The inner wall of the limiting guide (4) is provided with a first mounting groove (46) that matches the first reinforcing rib (34) and a second mounting groove (47) that matches the second reinforcing rib (35).

10. An injection pen, characterized in that, The excitation and locking structure as described in any one of claims 1-9 includes: The pen cap (7) is fixedly connected to the actuating element (3); Pen cap (10), the pen cap (10) is fitted onto the end of the pen body (1) near the needle tip.

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