Sub-assembly of injection pen and injection pen

Abstract

The utility model discloses a sub-assembly of an injection pen and the injection pen, the sub-assembly comprises a pen shell, the pen shell is provided with a mounting port, the mounting port is provided with a flange, and the flange is provided with a clamping groove; the refill bracket is provided with a clamping part, and the refill bracket can be rotatably arranged at the mounting opening between a working position and a dismounting position; when the refill bracket is located at the working position, the clamping part is matched with the clamping groove so as to limit the position of the refill bracket in the circumferential direction of the pen shell; the flange is configured to be capable of guiding the clamping part to rotate to the clamping groove in the first direction when the refill support rotates to the working position from the disassembly and assembly position; the first side of the clamping part is configured to be capable of being matched with the inner wall face of the clamping groove and limiting the refill support to rotate in the first direction when the refill support is located at the working position. The second side of the clamping part is configured to be capable of being matched with the inner wall face of the clamping groove and guiding the clamping part to rotate in the second direction when the refill support is located at the working position so that the refill support can rotate to the dismounting and mounting position from the working position.

Description

Technical Field

[0001] This application belongs to the technical field of medical devices, and particularly relates to a sub-component of an injection pen and an injection pen. Background Art

[0002] An electronic injection pen generally includes a pen shell, a cartridge holder, a driving member, a detection unit, etc. The cartridge holder and the pen shell are connected together by a rotational snap connection. The structure of this injection pen defines the circumferential position of the cartridge holder through the cooperation of an arc-shaped boss on the cartridge holder and an arc-shaped slot on the pen shell. As Figure 1 shown, although the design of the arc-shaped boss enables the cartridge holder to be rotated and disassembled in both the counterclockwise and clockwise directions, during the installation process, when the user applies a slightly greater force, the arc-shaped boss will slide across the arc-shaped slot, failing to play a limiting role, resulting in the over-positioning of the cartridge holder. When it is over-positioned, the detection unit on the cartridge holder will disengage from the receiving unit inside the pen shell, making it unable to recognize the presence of the cartridge and easily causing damage to the injection pen. Utility Model Content

[0003] The first object of this application is to provide a new technical solution for a sub-component of an injection pen, which can at least solve the technical problem that the cartridge holder of the existing injection pen is prone to over-positioning during installation.

[0004] The second object of this application is to provide a new technical solution for an injection pen.

[0005] According to the first aspect of this application, there is provided a sub-component of an injection pen, including: a pen shell, one end of the pen shell is provided with an installation opening, the inner wall surface of the installation opening is provided with a flange, and the flange is provided with a slot; a cartridge holder, the cartridge holder is provided with a snap-in portion, and the cartridge holder is rotatably arranged in the installation opening between a working position and a disassembly and assembly position; wherein, when the cartridge holder is in the working position, the snap-in portion cooperates with the slot to limit the position of the cartridge holder in the circumferential direction of the pen shell; the flange is configured to guide the snap-in portion to rotate along a first direction to the slot when the cartridge holder rotates from the disassembly and assembly position to the working position; a first side of the snap-in portion is configured to cooperate with the inner wall surface of the slot and limit the rotation of the cartridge holder along the first direction when the cartridge holder is in the working position; a second side of the snap-in portion is configured to cooperate with the inner wall surface of the slot and guide the snap-in portion to rotate along a second direction when the cartridge holder is in the working position, so that the cartridge holder can rotate from the working position to the disassembly and assembly position, wherein the second direction is opposite to the first direction.

[0006] Optionally, the flange extends circumferentially along the pen shell, and the flange is provided with an avoidance notch penetrating in its thickness direction. The refill holder is provided with a first fixing portion and a second fixing portion. When the refill holder is in the working position, the second fixing portion is located inside the pen shell, the flange is located between the first fixing portion and the second fixing portion, and the first fixing portion and the second fixing portion cooperate to define the position of the refill holder in the axial direction of the pen shell. When the refill holder is in the disassembly and assembly position, the second fixing portion corresponds to the avoidance notch, and the second fixing portion can pass through the avoidance notch.

[0007] Optionally, in the first direction, a guiding surface is provided on the wall surface of the avoidance notch close to the card slot, and the distance between the guiding surface and the axis of the pen shell gradually increases from the avoidance notch to the card slot.

[0008] Optionally, the guiding surface is an arc surface or an inclined surface.

[0009] Optionally, the surface of the first side of the clamping portion is a plane, and the surface of the first side of the clamping portion is parallel to the radial direction of the refill holder.

[0010] Optionally, the distance between the surface of the second side of the clamping portion and the axis of the refill holder gradually increases in the first direction.

[0011] Optionally, the surface of the second side of the clamping portion is an arc surface or an inclined surface.

[0012] Optionally, the clamping portion is formed as a triangular tooth.

[0013] Optionally, the triangular tooth is an inclined triangular tooth or a straight triangular tooth.

[0014] According to the second aspect of the present application, there is provided an injection pen, including the sub-component of the injection pen described in any one of the above.

[0015] According to the sub-component of the injection pen of the present application, by the cooperation of the provided clamping portion and the card slot, the position of the refill holder can be defined in the circumferential direction of the pen shell, and the matching design of the first side of the clamping portion and the inner wall surface of the card slot effectively restricts the excessive rotation of the refill holder during the installation process, so that the refill holder can be installed at an accurate position, enabling the detection unit on the refill holder to accurately dock with the receiving unit inside the pen shell, further ensuring that the injection pen can identify the refill, making the injection pen not easily damaged, and effectively improving the user experience.

[0016] 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

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0018] Figure 1 is a cross-sectional view of the connection between the refill holder and the pen case in the prior art;

[0019] Figure 2 is a cross-sectional view of the connection between the refill holder and the pen case of the injection pen according to an embodiment of the present application;

[0020] Figure 3 is a schematic structural view of the injection pen according to an embodiment of the present application;

[0021] Figure 4 is a partial schematic structural view of the injection pen according to an embodiment of the present application;

[0022] Figure 5 is a schematic structural view of the refill holder of the injection pen according to an embodiment of the present application;

[0023] Figure 6 is a sectional view of the connection between the refill holder and the pen case of the injection pen according to an embodiment of the present application;

[0024] Figure 7 is a sectional view of the injection pen with the refill installed in the refill holder according to an embodiment of the present application.

[0025] Reference numerals:

[0026] 100, injection pen;

[0027] 10, pen case; 11, flange; 111, card slot; 112, avoidance notch; 112a, guiding surface;

[0028] 20, refill holder; 20a, first member; 20b, second member; 21, clamping portion; 22, first fixing portion; 23, second fixing portion; 24, detection unit;

[0029] 30, receiving unit;

[0030] 200, arc-shaped boss;

[0031] 300, refill. Detailed Description of the Embodiments

[0032] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application.

[0033] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0034] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] First, the sub-components of the injection pen 100 according to the embodiments of the present application will be specifically described with reference to the drawings below.

[0036] As Figures 2 to 7 shown, the sub-components of the injection pen 100 according to the embodiments of the present application include: a pen housing 10 and a cartridge holder 20.

[0037] Specifically, one end of the pen housing 10 is provided with a mounting opening, the inner wall surface of the mounting opening is provided with a flange 11, the flange 11 is provided with a card slot 111, the cartridge holder 20 is provided with a clamping portion 21, and the cartridge holder 20 can be rotatably arranged in the mounting opening between a working position and a disassembly and assembly position; wherein, when the cartridge holder 20 is in the working position, the clamping portion 21 cooperates with the card slot 111 to limit the position of the cartridge holder 20 in the circumferential direction of the pen housing 10; the flange 11 is configured to guide the clamping portion 21 to rotate in a first direction to the card slot 111 when the cartridge holder 20 rotates from the disassembly and assembly position to the working position; the first side of the clamping portion 21 is configured to cooperate with the inner wall surface of the card slot 111 and limit the rotation of the cartridge holder 20 in the first direction when the cartridge holder 20 is in the working position; the second side of the clamping portion 21 is configured to cooperate with the inner wall surface of the card slot 111 and guide the clamping portion 21 to rotate in a second direction when the cartridge holder 20 is in the working position, so that the cartridge holder 20 can rotate from the working position to the disassembly and assembly position, wherein the second direction is opposite to the first direction.

[0038] In other words, as Figures 2 to 7 shown, the sub-components of the injection pen 100 according to the embodiments of the present application mainly include a pen housing 10 and a cartridge holder 20. Among them, one end of the pen housing 10 is provided with an installation opening communicating with its internal space, and the inner wall surface of the installation opening is provided with a flange 11 extending along its circumference. The cartridge holder 20 is provided with a receiving space suitable for installing a cartridge 300 (for example, a cartridge vial). For example, the cartridge holder 20 has a first member 20a and a second member 20b distributed along its axial direction, and the lower end of the first member 20a is threadedly connected to the upper end of the second member 20b. When installing the cartridge 300, first disassemble the first member 20a from the second member 20b, then insert the cartridge 300 into the first member 20a or the second member 20b, and finally tighten the first member 20a and the second member 20b to complete the installation of the cartridge 300.

[0039] The side wall of the cartridge holder 20 is provided with a clamping portion 21, and the inner wall surface of the installation opening is provided with a clamping groove 111 adapted to the clamping portion 21. The cartridge holder 20 can be rotatably arranged in the installation opening between a working position and a disassembly and assembly position, so that the cartridge holder 20 can be installed and disassembled in a rotational manner. That is, the cartridge holder 20 can be rotated from the disassembly and assembly position along a first direction (for example, clockwise) to the working position to complete the installation. At this time, the injection pen 100 limits the position of the cartridge holder 20 by the cooperation of the clamping portion 21 and the clamping groove 111. The cartridge holder 20 can also be rotated from the working position along a second direction (for example, counterclockwise) to the disassembly and assembly position to disassemble the cartridge holder 20.

[0040] In this embodiment, a receiving unit 30 is provided in the pen housing 10, and the cartridge holder 20 is provided with a detection unit 24 adapted to the receiving unit 30. When the cartridge holder 20 is in the working position, the positions of the receiving unit 30 and the detection unit 24 correspond to each other, so that the injection pen 100 can identify the cartridge 300. If the cartridge holder 20 is installed in an over-positioned manner, the injection pen 100 cannot identify the cartridge 300, which easily causes damage to the injection pen 100 and affects the user experience.

[0041] Based on this, by restricting the rotation of the cartridge holder 20 in the first direction at the working position, the over - installation of the cartridge holder 20 can be avoided. In the embodiment, one side of the clamping portion 21 in the first direction is the first side, and one side of the clamping portion 21 in the second direction is the second side. When the cartridge holder 20 is in the working position, the clamping portion 21 cooperates with the card slot 111. At this time, the surface of the first side of the clamping portion 21 fits with the wall surface of the card slot 111, and the surface of the second side of the clamping portion 21 also fits with the wall surface of the card slot 111, so as to limit the position of the cartridge holder 20 in the circumferential direction of the pen case 10; when the cartridge holder 20 rotates from the disassembly and assembly position to the working position, the flange 11 can guide the clamping portion 21 to rotate in the first direction to the card slot 111, which is beneficial to the installation of the position of the cartridge holder 20; the first side of the clamping portion 21 is configured to be able to cooperate with the inner wall surface of the card slot 111 and limit the rotation of the cartridge holder 20 in the first direction when the cartridge holder 20 is in the working position. Since the acting force applied to the cartridge holder 20 during the installation of the cartridge holder 20 is in the first direction, when installing the cartridge holder 20, the cooperation between the first side of the clamping portion 21 and the inner wall surface of the card slot 111 can avoid the detachment of the clamping portion 21 from the card slot 111 due to excessive rotational force during installation, so as to ensure that the cartridge holder 20 can be installed at the accurate position; the second side of the clamping portion 21 is configured to be able to cooperate with the inner wall surface of the card slot 111 when the cartridge holder 20 is in the working position, and can guide the clamping portion 21 to rotate in the second direction when the cartridge holder 20 is subjected to a force in the second direction. That is, the surface of the second side of the clamping portion 21 can be an inclined surface or an arc surface, etc. When disassembling the cartridge holder 20, the surface of the second side of the clamping portion 21 can guide the clamping portion 21 to rotate in the second direction, so that the cartridge holder 20 can rotate from the working position to the disassembly and assembly position, facilitating the disassembly of the cartridge holder 20.

[0042] Thus, for the sub - assembly of the injection pen 100 according to the embodiment of the present application, by setting the clamping portion 21 to cooperate with the card slot 111, the position of the cartridge holder 20 can be limited in the circumferential direction of the pen case 10, and the cooperation design between the first side of the clamping portion 21 and the inner wall surface of the card slot 111 effectively limits the excessive rotation of the cartridge holder 20 during installation, so as to ensure that the cartridge holder 20 can be installed at the accurate position, enabling the detection unit 24 on the cartridge holder 20 to accurately dock with the receiving unit 30 on the pen case 10, further ensuring that the injection pen 100 can identify the pen core 300, making the injection pen 100 not easily damaged, and effectively improving the user experience.

[0043] It should be noted that the detection unit 24 and the receiving unit 30 mentioned in the above - mentioned embodiment can be the detection unit and the receiving unit used in the injection pen in the prior art. Those skilled in the art should understand that the embodiments of the present application will not be elaborated herein.

[0044] In some specific embodiments of the present application, the flange 11 extends along the circumferential direction of the pen shell 10. The flange 11 is provided with an avoidance notch 112 penetrating along its thickness direction. The pen core holder 20 is provided with a first fixing portion 22 and a second fixing portion 23. Among them, when the pen core holder 20 is in the working position, the second fixing portion 23 is located inside the pen shell 10, the flange 11 is located between the first fixing portion 22 and the second fixing portion 23, and the first fixing portion 22 and the second fixing portion 23 cooperate to axially limit the position of the pen core holder 20 in the pen shell 10. When the pen core holder 20 is in the disassembly and assembly position, the second fixing portion 23 corresponds to the avoidance notch 112, and the second fixing portion 23 can pass through the avoidance notch 112.

[0045] Specifically, as Figures 2 to 6 shown, the pen core holder 20 has a first functional section and a second functional section distributed along its axial direction. Among them, the first end of the first functional section is adapted to be connected to an injection needle, and the side wall of the first functional section is provided with a first fixing portion 22. The radial dimension of the first fixing portion 22 is greater than the radial dimension of the mounting opening, so as to prevent the first fixing portion 22 from passing through the mounting opening. The first end of the second functional section is provided at the second end of the first functional section. The radial dimension of the second functional section is adapted to the mounting opening, so as to facilitate the second functional section to extend into the pen shell 10 from the mounting opening. The side wall of the second functional section is provided with at least one second fixing portion 23. The number of the second fixing portions 23 corresponds to the number of the avoidance notches 112, and the size of the second fixing portion 23 is adapted to the size of the avoidance notch 112, so as to facilitate the second fixing portion 23 to pass through the avoidance notch 112.

[0046] When installing the pen core holder 20, the second fixing portion 23 corresponds to the position of the avoidance notch 112. The second functional section can be inserted into the pen shell 10 from the mounting opening until the first fixing portion 22 abuts against the flange 11. At this time, the pen core holder 20 is in the disassembly and assembly position. Subsequently, rotate the pen core holder 20 in the first direction until the pen core holder 20 is rotated to the working position, and make the clamping portion 21 located in the card slot 111 to complete the installation of the pen core holder 20.

[0047] When disassembling the pen core holder 20, rotate the pen core holder 20 in the second direction to disengage the clamping portion 21 from the card slot 111, and rotate the pen core holder 20 to the disassembly and assembly position, so that the second fixing portion 23 corresponds to the position of the avoidance notch 112. At this time, the pen core holder 20 can be pulled out axially towards the outside of the pen shell 10.

[0048] In this embodiment, through the cooperation of the first fixing portion 22 and the second fixing portion 23 provided, the refill holder 20 can be installed by means of insertion and rotation. The operation is simple, facilitating the installation of the refill holder 20. Also, the refill holder 20 can be disassembled by means of rotational extraction, with simple operation and facilitating the disassembly of the refill holder 20. Thus, it is convenient to replace the refill 300 inside the refill holder 20, and the structure is simple, facilitating production and manufacturing.

[0049] According to an embodiment of the present application, in the first direction, a guiding surface 112a is provided on the wall surface of the avoiding notch 112 close to the card slot 111, and the distance between the guiding surface 112a and the axis of the pen shell 10 gradually increases from the avoiding notch 112 to the card slot 111.

[0050] That is to say, as Figure 2 and Figure 4 shown, in the first direction, a guiding surface 112a adapted to cooperate with the engaging portion 21 is provided on the wall surface of the avoiding notch 112 close to the card slot 111, and the distance between the guiding surface 112a and the axis of the pen shell 10 gradually increases in the first direction, making the rotation of the refill holder 20 from the disassembly and assembly position to the working position smoother, and effectively improving the user experience.

[0051] According to some embodiments of the present application, the guiding surface 112a is an arc surface or an inclined surface.

[0052] In this embodiment, as Figure 2 and Figure 4 shown, by setting the guiding surface 112a as an arc surface or an inclined surface, the rotation process of the refill holder 20 can be further optimized, effectively reducing friction and wear, and making the rotation process smoother, which can effectively extend the service life of the injection pen 100.

[0053] According to an embodiment of the present application, the surface of the first side of the engaging portion 21 is a plane, and the surface of the first side of the engaging portion 21 is parallel to the radial direction of the refill holder 20.

[0054] Specifically, as Figure 2 shown, the surface of the first side of the engaging portion 21 is a plane, and this plane is parallel to the radial direction of the refill holder 20, so that the acting force between the engaging portion 21 and the inner wall of the card slot 111 is perpendicular to the surface of the first side of the engaging portion 21, ensuring the load-bearing effect of the engaging portion 21.

[0055] In some specific embodiments of the present application, the distance between the surface of the second side of the engaging portion 21 and the axis of the refill holder 20 gradually increases in the first direction, making the rotation of the refill holder 20 from the working position to the disassembly and assembly position smoother, and effectively improving the user experience.

[0056] According to an embodiment of the present application, the surface of the second side of the snap-in portion 21 is an arc surface or an inclined surface.

[0057] In this embodiment, the surface of the second side of the snap-in portion 21 is set as an arc surface or an inclined surface. Both the arc surface and the inclined surface can effectively guide the rotation of the snap-in portion 21, making the disassembly process of the refill holder 20 smoother, thereby effectively extending the service life of the injection pen 100.

[0058] In some specific embodiments of the present application, the snap-in portion 21 is formed as a triangular tooth, with a simple structure and being convenient for production and manufacturing. In addition, the snap-in portion 21 can also be structures such as trapezoidal teeth or barbs, which are not limited in this embodiment.

[0059] According to an embodiment of the present application, the triangular tooth is an inclined triangular tooth or a straight triangular tooth.

[0060] That is to say, the triangular tooth can extend along the axial direction of the refill holder 20 to form a straight triangular tooth, or the triangular tooth can also extend along a direction inclined to the axial direction of the refill holder 20 to form an inclined triangular tooth. The inclined triangular tooth can increase the contact area between the snap-in portion 21 and the inner wall surface of the card slot 111, and can improve the stability of the refill holder 20 in the working position.

[0061] In some examples of the present application, the height of the snap-in portion 21 is 0.5 mm to 10 mm, preferably 2 mm, which is not limited in this example.

[0062] All in all, for the sub-assembly of the injection pen 100 according to the embodiment of the present application, through the cooperation of the provided snap-in portion 21 and the card slot 111, the position of the refill holder 20 can be defined in the circumferential direction of the pen shell 10. Moreover, the cooperative design of the first side of the snap-in portion 21 and the inner wall surface of the card slot 111 effectively limits the excessive rotation of the refill holder 20 during the installation process, thereby ensuring that the refill holder 20 can be installed at an accurate position, enabling the detection unit 24 on the refill holder 20 to accurately dock with the receiving unit 30 on the pen shell 10, further ensuring that the injection pen 100 can identify the refill 300, making the injection pen 100 not easily damaged, and effectively improving the user experience.

[0063] Such as Figure 3As shown, an embodiment of the present application further provides an injection pen 100. The injection pen 100 is an electronic injection pen, and the injection pen 100 includes the sub-components of the injection pen described in any of the above embodiments. A refill 300 is installed in a refill holder 20. The refill holder 20 is provided with a detection unit 24. The detection unit 24 may include a temperature sensor. The temperature of the refill 300 can be detected through the temperature sensor. A receiving unit 30, such as a temperature control detection board assembly, is provided in the pen case 10. When the refill holder 20 is in the working position, the detection unit 24 is aligned with the receiving unit 30, so as to facilitate the injection pen 100 to identify the refill 300. Since the sub-components of the injection pen 100 according to the embodiment of the present application have the above effects, the injection pen 100 according to the embodiment of the present application also has corresponding effects, which will not be elaborated in this embodiment.

[0064] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A sub-component of an injection pen, characterized in that, Comprising: A pen shell (10), one end of the pen shell (10) is provided with an installation opening, the inner wall surface of the installation opening is provided with a flange (11), and the flange (11) is provided with a clamping groove (111); A pen core holder (20), the pen core holder (20) is provided with a clamping portion (21), and the pen core holder (20) can be rotatably arranged in the installation opening between a working position and a disassembly and assembly position; Wherein, when the pen core holder (20) is in the working position, the clamping portion (21) cooperates with the clamping groove (111) to limit the position of the pen core holder (20) in the circumferential direction of the pen shell (10); The flange (11) is configured to guide the clamping portion (21) to rotate in a first direction to the clamping groove (111) when the pen core holder (20) rotates from the disassembly and assembly position to the working position; The first side of the clamping portion (21) is configured to cooperate with the inner wall surface of the clamping groove (111) and limit the pen core holder (20) from rotating in the first direction when the pen core holder (20) is in the working position; The second side of the clamping portion (21) is configured to cooperate with the inner wall surface of the clamping groove (111) and guide the clamping portion (21) to rotate in a second direction when the pen core holder (20) is in the working position, so that the pen core holder (20) can rotate from the working position to the disassembly and assembly position, wherein the second direction is opposite to the first direction.

2. The sub-assembly of the injection pen according to claim 1, characterized in that, The flange (11) extends along the circumferential direction of the pen shell (10), the flange (11) is provided with an avoidance notch (112) penetrating along its thickness direction, and the pen core holder (20) is provided with a first fixing portion (22) and a second fixing portion (23); Wherein, when the pen core holder (20) is in the working position, the second fixing portion (23) is located inside the pen shell (10), the flange (11) is located between the first fixing portion (22) and the second fixing portion (23), and the first fixing portion (22) and the second fixing portion (23) cooperate to limit the position of the pen core holder (20) in the axial direction of the pen shell (10); When the pen core holder (20) is in the disassembly and assembly position, the second fixing portion (23) corresponds to the avoidance notch (112), and the second fixing portion (23) can pass through the avoidance notch (112).

3. The sub-assembly of the injection pen according to claim 2, characterized in that, In the first direction, the wall surface of the avoidance notch (112) close to the clamping groove (111) is provided with a guiding surface (112a), and the distance between the guiding surface (112a) and the axis of the pen shell (10) gradually increases from the avoidance notch (112) to the clamping groove (111).

4. The sub - assembly of the injection pen according to claim 3, characterized in that, The guiding surface (112a) is an arc surface or an inclined surface.

5. The sub-component of the injection pen according to claim 1, characterized in that, The surface of the first side of the clamping portion (21) is a plane, and the surface of the first side of the clamping portion (21) is parallel to the radial direction of the pen core holder (20).

6. The sub-assembly of the injection pen according to claim 1, wherein The distance between the surface of the second side of the clamping portion (21) and the axis of the pen core holder (20) gradually increases in the first direction.

7. The sub-assembly of the injection pen according to claim 5, characterized in that, The surface of the second side of the clamping portion (21) is an arc surface or an inclined surface.

8. The sub-component of the injection pen according to claim 5, characterized in that, The clamping portion (21) is formed as a triangular tooth.

9. The sub-assembly of the injection pen according to claim 8, characterized in that, The triangular tooth is an inclined triangular tooth or a straight triangular tooth.

10. An injection pen, characterized in that, It includes a sub-assembly of the injection pen according to any one of claims 1 to 9.

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