Injection mechanism and injection pen

Abstract

The invention belongs to the technical field of injection pens, and particularly relates to an injection mechanism and an injection pen, the injection mechanism comprises a support, the side wall of the support is provided with an excitation groove, and the excitation groove is communicated with an inclined locking groove; the sliding sleeve is arranged on the outer side of the support in a sleeving mode, a locking block is arranged on the inner wall of the sliding sleeve, and the locking block is arranged in the excitation groove in a sliding mode; the fixing clamp is arranged in the support, and the fixing clamp can slide in the axial direction; one end of the elastic piece is connected with the fixing clamp and the other end is connected with the sliding sleeve; when injection is excited, the sliding sleeve slides to an excitation position along the excitation groove, after injection is completed, the elastic piece pushes the sliding sleeve to enable the locking block to slide to the locking groove from the excitation groove, and the sliding sleeve is locked; a mounting groove penetrating through the bottom of the bracket is formed in the bottom of the locking groove; the mounting groove penetrating through the support is formed in the bottom of the locking groove, the sliding sleeve is lifted upwards and then rotated by a certain angle, mounting of the sliding sleeve is completed, and it is guaranteed that the locking block is stably mounted in the excitation groove.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of injection pens, and particularly relates to an injection mechanism and an injection pen. BACKGROUND

[0002] An injection pen is a medical device used for subcutaneous or intramuscular injection of drugs, designed to improve the convenience, accuracy, and safety of drug injection.

[0003] A Chinese patent application with the application number 202510710200.4 discloses an injection pen assembly and an injection pen, which comprises an end cap, an upper pen body connected with the end cap, a bracket located in the upper pen body, a proximal end of the bracket being connected with the end cap, a side wall of the bracket being provided with a limiting sliding groove, a distal end of the limiting sliding groove extending a trigger sliding groove and a locking sliding groove, a push rod sleeve being sleeved on the outside of the bracket, an inner wall of the push rod sleeve being provided with a sliding block, the sliding block being clamped in the trigger sliding groove before the injection pen is triggered, when the push rod sleeve slides towards the proximal end, the sliding block slides from the trigger sliding groove into the limiting sliding groove, and the injection pen is triggered, after the injection is completed, the push rod sleeve slides towards the distal end, the sliding block slides from the limiting sliding groove into the locking sliding groove, an end wall of the locking sliding groove forms a locking surface, and the sliding block is stopped by the locking surface to lock the push rod sleeve; in order to solve the problem that the needle is exposed again after the injection is completed, the limiting sliding groove, the trigger sliding groove, the locking sliding groove, and the sliding block are matched to lock the push rod sleeve after the injection is completed, which is essentially the matching of the protrusion and the sliding groove, however, when the push rod sleeve is installed, it is usually inserted from the slot at the top of the bracket by manual operation, the installation distance is long, the protrusion is easily slid into the locking groove, and the push rod sleeve is locked after installation, which cannot be used normally.

[0004] Therefore, how to avoid the position error of the protrusion in the installation process to cause the injection mechanism to be unable to be used normally is a technical problem urgently to be solved in the field.

[0005] It should be noted that the above information disclosed in the background section is only used to understand the background of the present application, and therefore, the above description is not considered to constitute the information of the prior art. SUMMARY

[0006] The present application at least provides an injection mechanism and an injection pen.

[0007] In a first aspect, embodiments of this disclosure provide an injection mechanism, comprising: a support, wherein an activation groove is formed on the side wall of the support, and the activation groove is connected to an inclined locking groove; a sliding sleeve, which is sleeved on the outside of the support, and a locking block is provided on the inner wall of the sliding sleeve, the locking block being slidably disposed within the activation groove; a fixing clamp, which is disposed inside the support and is axially slidable; an elastic element, one end of which is connected to the fixing clamp and the other end of which is connected to the sliding sleeve; during activation injection, the sliding sleeve slides along the activation groove to the activation position, and after injection is completed, the elastic element pushes the sliding sleeve to make the locking block slide from the activation groove to the locking groove, thereby locking the sliding sleeve; and, the bottom of the locking groove is provided with an installation groove penetrating the bottom of the support.

[0008] In one alternative embodiment, the locking groove includes a locking notch, the bottom of which is provided with an installation groove.

[0009] In one alternative embodiment, the mounting slot is arranged parallel to the axis of the bracket.

[0010] In one alternative embodiment, the free end of the mounting groove is provided with a flared opening, which is adapted to guide the locking block into the mounting groove when the sliding sleeve is installed.

[0011] In one optional embodiment, the excitation groove includes a first vertical groove and a second vertical groove parallel to the axis of the support; the second vertical groove is disposed to the side of the first vertical groove, and the second vertical groove is connected to the first vertical groove through an inclined groove; wherein, in the initial state, the locking block is locked at the bottom of the second vertical groove, and during excitation injection, the locking block enters the excitation position in the first vertical groove from the second vertical groove through the inclined groove.

[0012] In one alternative implementation, the locking groove is connected to the port of the first vertical groove.

[0013] In one optional embodiment, a locking surface is provided at the top of the locking notch. The locking surface is inclined. After the injection is completed, the elastic element pushes the sliding sleeve to make the locking block slide from the excitation groove to the locking groove, and then the locking block abuts against the locking surface.

[0014] In one optional embodiment, one end of the fixing clamp is provided with two clamping ears, which are adapted to hold the injection push rod. In the initial position, the two clamping ears are wrapped by the sliding sleeve. During injection activation, the sliding sleeve slides along the activation groove to the activation position, and the two clamping ears are released. The bracket is provided with two through grooves that pass through the top end of the bracket. The other end of the fixing clamp includes two supporting ears, which are correspondingly disposed in the through grooves. One end of the elastic element abuts against the supporting ears, and the other end abuts against the sliding sleeve.

[0015] In one alternative embodiment, the end of the sliding sleeve is provided with a visible notch, the circumferential position of which is aligned with the locking block.

[0016] Secondly, this disclosure also provides an injection pen, comprising: a lower pen body having a medicine bottle disposed therein, and an actuating element slidably disposed on the outer side of the medicine bottle; an upper pen body inserted into the top of the lower pen body, an end cap being disposed at the end of the upper pen body, and a connecting rod being disposed on the end cap; the aforementioned injection mechanism, wherein the support is inserted into the upper pen body, and the sliding sleeve is always held against by the actuating element; and the injection mechanism further comprises an injection push rod, the injection push rod being sleeved on the connecting rod by an elastic element, and the injection push rod being inserted into a fixing clamp, wherein a limiting notch is formed on the side wall of the injection push rod, and the fixing clamp is adapted to clamp the limiting notch to limit the injection push rod.

[0017] The beneficial effects of this invention are that, by setting an installation groove through the bracket at the bottom of the locking groove, the sliding sleeve is directly rotated until the locking block is aligned with the installation groove, the sliding sleeve is lifted, and then the locking block is rotated into the activation groove to complete the installation of the sliding sleeve. The installation process must be coordinated with a certain angle to ensure that the locking block is stably installed in the activation groove and that the injection pen can be used normally.

[0018] This effectively reduces the likelihood of damage to the locking block during installation and ensures stable locking of the sliding sleeve.

[0019] Other features and advantages of the invention will be set forth in the description which follows, 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 in accordance with the structures particularly pointed out in the description, claims and drawings.

[0020] 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

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art 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.

[0022] Figure 1 A perspective view of an injection pen provided in an embodiment of this disclosure; Figure 2 A perspective view of an injection mechanism provided in an embodiment of this disclosure; Figure 3 An exploded view of an injection mechanism provided in an embodiment of this disclosure; Figure 4 for Figure 3 Enlarged view of point A; Figure 5 A cross-sectional view of the upper body of a pen provided in an embodiment of this disclosure.

[0023] In the picture: 1. Bracket; 11. Excitation groove; 11a. First vertical groove; 11b. Second vertical groove; 11c. Inclined groove; 12. Locking groove; 13. Locking notch; 13a. Locking surface; 14. Mounting slot; 14a. Flared opening; 15. Elastic element; 16. Fixing clip; 16a. Clip ear; 16b. Support ear; 17. Through groove; 18. Injection plunger; 18a. Limiting notch; 2. Sliding sleeve; 21. Locking block; 22. Visible notch; 3. Pen body; 31. Medicine bottle; 32. Actuating component; 4. Upper pen body; 41. End cap; 41a. Connecting rod. Detailed Implementation

[0024] 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.

[0025] 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.

[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 clearly 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 revealed that in existing technologies, the sliding sleeve is installed into the bracket from above, and the long installation distance can easily lead to damage to the locking block. This is the problem and objective that the invention aims to solve.

[0029] Based on the above research, this disclosure provides an injection mechanism and injection pen. By providing a through mounting groove at the bottom of the locking groove, the installation distance of the sliding sleeve is shortened, thus preventing damage to the locking block during installation.

[0030] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0031] 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.

[0032] 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.

[0033] See Figures 1 to 5 This embodiment illustrates an injection mechanism, comprising: a support 1, wherein an activation groove 11 is formed on the side wall of the support 1, and the activation groove 11 is connected to an inclined locking groove 12; a sliding sleeve 2, which is sleeved on the outside of the support 1, and a locking block 21 is provided on the inner wall of the sliding sleeve 2, the locking block 21 being slidably disposed within the activation groove 11; a fixing clamp 16, which is disposed inside the support 1, and the fixing clamp 16 being axially slidable; and an elastic element 15, one end of which is connected to the fixing clamp 16, and the other end of which is connected to the sliding sleeve 2; during activation injection, the sliding sleeve 2 slides along the activation groove 11 to the activation position, and after the injection is completed, the elastic element 15 pushes the sliding sleeve 2 to move the locking block 21 out of the activation groove. 11 slides to the locking groove 12, and the sliding sleeve 2 is locked; and, the bottom of the locking groove 12 is provided with an installation groove 14 that penetrates the bottom of the bracket 1; in short, by providing an installation groove 14 that penetrates the bracket 1 at the bottom of the locking groove 12, the sliding sleeve 2 is directly rotated until the locking block 21 is aligned with the installation groove 14, and then the sliding sleeve 2 is moved so that the locking block 21 enters the locking groove 12 from the installation groove 14, and then the locking block 21 is rotated to the initial position in the excitation groove 11 to complete the installation of the sliding sleeve 2. From the installation groove 14 to the initial position in the excitation groove 11, the installation process must be coordinated by rotating through a certain angle to ensure that the locking block 21 is stably installed in the excitation groove 11 and to ensure that the injection pen can be used normally.

[0034] In some embodiments, the locking groove 12 includes a locking notch 13, and the bottom of the locking notch 13 is provided with an installation groove 14; in short, the locking groove 12 is adapted to guide the locking block 21 into the locking notch 13 to limit the locking block 21 and prevent it from sliding back into the trigger groove 11, and the installation groove 14 is provided at the bottom of the locking notch 13 to facilitate the installation of the locking block 21.

[0035] In some embodiments, the mounting groove 14 is arranged parallel to the axis of the bracket 1; in short, with this design, the installation of the sliding sleeve 2 can be completed simply by aligning the mounting groove 14 with the locking block 21 and then lifting the sliding sleeve 2.

[0036] In some embodiments, the free end of the mounting groove 14 is provided with a flared opening 14a, which is adapted to guide the locking block 21 into the mounting groove 14 when the sliding sleeve 2 is installed; in short, the flared opening 14a can guide the locking block 21 to slide smoothly into the mounting groove 14.

[0037] In some embodiments, the excitation groove 11 includes a first vertical groove 11a and a second vertical groove 11b parallel to the axis of the bracket 1; the second vertical groove 11b is disposed to the side of the first vertical groove 11a, and the second vertical groove 11b communicates with the first vertical groove 11a through an inclined groove 11c; wherein, in the initial state, the locking block 21 is engaged at the bottom of the second vertical groove 11b, that is, after the installation of the sliding sleeve 2 is completed, the locking block 21 is engaged at the bottom of the second vertical groove 11b. Specifically, the locking block 21 enters the locking groove 12 from the mounting groove 14, and after rotating the locking block 21 to the excitation groove 11, it can be moved back to the initial position to complete the assembly by directly folding back along the second vertical groove 11b. Since both the second vertical groove 11b and the mounting groove 14 are parallel to the axis of the bracket 1, the locking block 21 moves along the mounting groove 11b. 4. The moving directions of the second vertical groove 11b are exactly opposite, which makes it easier to identify the two steps during production line assembly, thereby reducing the probability of assembly errors. During the ignition injection, the locking block 21 enters the ignition position in the first vertical groove 11a from the second vertical groove 11b through the inclined groove 11c. In short, the first vertical groove 11a and the second vertical groove 11b are straight grooves parallel to the axis of the bracket 1, which ensures the smooth sliding of the locking block 21. Furthermore, in the initial state, the locking block 21 is in the second vertical groove 11b. When the sliding sleeve 2 slides upward, the locking block 21 enters the ignition position in the first vertical groove 11a (i.e., the upper middle part of the first vertical groove 11a) under the guidance of the inclined groove 11c.

[0038] In some embodiments, the locking groove 12 is connected to the port of the first vertical groove 11a; in short, the locking groove 12 is provided at the end of the first vertical groove 11a to ensure that the locking block 21 smoothly enters the locking groove 12 when it slides down to the bottom in the first vertical groove 11a.

[0039] In some embodiments, a locking surface 13a is provided at the top of the locking notch 13. The locking surface 13a is inclined. After the injection is completed, the elastic member 15 pushes the sliding sleeve 2 to make the locking block 21 slide from the excitation groove 11 to the locking groove 12. Then, the locking block 21 abuts against the locking surface 13a. In short, the locking surface 13a and the locking groove 12 are inclined in opposite directions so that the locking block 21 is guided away from the locking groove 12 by the locking surface 13a, ensuring that the sliding sleeve 2 will not slide up again.

[0040] In some embodiments, one end of the fixing clamp 16 is provided with two clamping ears 16a, which are adapted to hold the injection push rod. In the initial position, the two clamping ears 16a are wrapped by the sliding sleeve 2. During injection activation, the sliding sleeve 2 slides along the activation groove 11 to the activation position, and the two clamping ears 16a are released. The support 1 is provided with two through grooves 17, which penetrate the top end of the support 1. The other end of the fixing clamp 16 includes two supporting ears 16b, which are correspondingly disposed in the through grooves 17. The elastic element One end of the clamp 15 abuts against the lug 16b, and the other end abuts against the sliding sleeve 2. In short, the clamp 16 is adapted to hold the injection push rod 18. The upper lug 16b is held by the through groove 17 to prevent the injection push rod 18 from sliding down and pushing the medicine bottle 31. The lower clamp lug 16a clamps the limiting notch 18a on the injection push rod 18 to prevent the injection push rod 18 from being released. In order to ensure the clamping of the clamp lug 16a, it is set inside the sliding sleeve 2 and is held by the inner wall of the sliding sleeve 2. When the sliding sleeve 2 slides up, the clamp lug 16a can expand outward to release the injection push rod 18.

[0041] In some embodiments, a visible notch 22 is provided at the end of the sliding sleeve 2, and the circumferential position of the visible notch 22 is aligned with the locking block 21; in short, the visible notch 22 is provided on the outer side wall of the sliding sleeve 2 so that the installer can determine the position of the locking block 21 through the visible window.

[0042] See Figures 1 to 5 This embodiment also shows an injection pen, including: a lower pen body 3, in which a medicine bottle 31 is disposed, and an actuating element 32 is slidably disposed on the outside of the medicine bottle 31; an upper pen body 4, which is inserted into the top of the lower pen body 3, and an end cap 41 is disposed at the end of the upper pen body 4, and an insertion rod 41a is provided on the end cap 41; the aforementioned injection mechanism, wherein the support 1 is inserted into the upper pen body 4, and the sliding sleeve 2 is always held against by the actuating element 32; and the injection mechanism further includes an injection push rod 18, which is sleeved on the upper pen body by an elastic element 15. The injection push rod 18 is inserted into the fixing clip 16 on the plug rod 41a. The side wall of the injection push rod 18 has a limiting notch 18a. The fixing clip 16 is adapted to clamp the limiting notch 18a to limit the injection push rod 18. In short, the activator 32 is slidably disposed in the lower pen body 3. The needle of the medicine bottle 31 is exposed by the upward sliding of the activator 32. At the same time, the upward sliding of the sliding sleeve 2 is completed to realize the activation of the injection push rod 18. After the activator 32 is reset, the sliding sleeve 2 is locked to prevent the needle of the medicine bottle 31 from being exposed again.

[0043] 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.

[0044] 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, are based on the orientation or positional relationships shown in the accompanying drawings and 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.

[0045] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0046] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0047] 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 injection mechanism, characterized in that, include: The bracket (1) has an excitation groove (11) on its side wall, and the excitation groove (11) is connected to an inclined locking groove (12). A sliding sleeve (2) is sleeved on the outside of the bracket (1). A locking block (21) is provided on the inner wall of the sliding sleeve (2). The locking block (21) is slidably disposed in the excitation groove (11). A fixing clip (16) is disposed inside the bracket (1), and the fixing clip (16) is axially slidable; The elastic element (15) is connected to a fixing clamp (16) at one end and to a sliding sleeve (2) at the other end. During the activation injection, the sliding sleeve (2) slides along the activation groove (11) to the activation position. After the injection is completed, the elastic element (15) pushes the sliding sleeve (2) to make the locking block (21) slide from the activation groove (11) to the locking groove (12), and the sliding sleeve (2) is locked; and, The bottom of the locking groove (12) is provided with a mounting groove (14) that penetrates the bottom of the bracket (1).

2. The injection mechanism as described in claim 1, characterized in that, The locking groove (12) includes a locking notch (13), and the bottom of the locking notch (13) is provided with an installation groove (14).

3. The injection mechanism as described in claim 2, characterized in that, The mounting groove (14) is set parallel to the axis of the bracket (1).

4. The injection mechanism as described in claim 2, characterized in that, The free end of the mounting groove (14) is provided with a flared opening (14a), which is adapted to guide the locking block (21) into the mounting groove (14) when the sliding sleeve (2) is installed.

5. The injection mechanism as described in claim 2, characterized in that, The excitation groove (11) includes a first vertical groove (11a) and a second vertical groove (11b) parallel to the axis of the support (1). The second vertical groove (11b) is disposed to the side of the first vertical groove (11a), and the second vertical groove (11b) is connected to the first vertical groove (11a) through an inclined groove (11c); wherein, In the initial state, the locking block (21) is stuck at the bottom of the second vertical groove (11b). When the injection is activated, the locking block (21) enters the activation position in the first vertical groove (11a) from the second vertical groove (11b) through the inclined groove (11c).

6. The injection mechanism as described in claim 5, characterized in that, The locking groove (12) is connected to the port of the first vertical groove (11a).

7. The injection mechanism as described in claim 2, characterized in that, The top of the locking notch (13) is provided with a locking surface (13a). The locking surface (13a) is inclined. After the injection is completed, the elastic element (15) pushes the sliding sleeve (2) to make the locking block (21) slide from the excitation groove (11) to the locking groove (12). Then, the locking block (21) abuts against the locking surface (13a).

8. The injection mechanism as described in any one of claims 1-7, characterized in that, One end of the fixed clamp (16) is provided with two clamp ears (16a). The clamp ears (16a) are adapted to hold the push rod. In the initial position, the two clamp ears (16a) are wrapped by the sliding sleeve (2). When the injection is activated, the sliding sleeve (2) slides along the activation groove (11) to the activation position, and the two clamp ears (16a) are released. The bracket (1) is provided with two through slots (17), which pass through the top of the bracket (1). The other end of the fixing clamp (16) includes two lugs (16b), which are correspondingly arranged in the through slots (17). One end of the elastic element (15) abuts against the lugs (16b), and the other end abuts against the sliding sleeve (2).

9. The injection mechanism as described in claim 1, characterized in that, The end of the sliding sleeve (2) is provided with a visible notch (22), and the circumferential position of the visible notch (22) is aligned with the locking block (21).

10. An injection pen, characterized in that, include: The lower pen body (3) has a medicine bottle (31) inside, and an actuating element (32) is slidably arranged on the outside of the medicine bottle (31). The upper pen body (4) is inserted into the top of the lower pen body (3), and the end of the upper pen body (4) is provided with an end cap (41), and the end cap (41) has a connecting rod (41a). The injection mechanism as described in any one of claims 1-9, wherein the support (1) is inserted into the upper pen body (4), and the sliding sleeve (2) is always held against by the actuating element (32); and, The injection mechanism also includes an injection push rod (18), which is sleeved on the plug rod (41a) by an elastic element (15) and inserted into a fixing clamp (16). The side wall of the injection push rod (18) has a limiting notch (18a), and the fixing clamp (16) is adapted to clamp the limiting notch (18a) to limit the injection push rod (18).

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