Method of assembling an injection pen and injection pen

Abstract

The present application belongs to the technical field of syringes, and particularly relates to an apparatus for inputting medium into a human body, and more particularly to an assembling method of an injection pen and the injection pen. The injection pen comprises a lower pen body, an upper pen body and a pen cover. The lower pen body comprises a lower shell and a sliding sleeve. The inner wall of the sliding sleeve near one end of the needle of the injection vial is provided with a plurality of elastic supports in the circumferential direction. One end of the elastic support is connected with the inner wall of the sliding sleeve, and the other end is abutted against the side wall of the needle of the injection vial. By arranging a plurality of elastic supports in the circumferential direction of the inner wall of the sliding sleeve of the lower pen body, the elastic supports are continuously abutted against the side wall of the needle of the injection vial in the natural state, forming multi-point radial support, protecting the needle before the pen cover of the injection pen is assembled, and preventing the needle from being bent. Meanwhile, the pen cover is guided by the elastic supports, so that the needle is prevented from being bent.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of syringes, and particularly relates to an apparatus for injecting a medium into a human body, and more particularly to an assembling method of an injection pen and the injection pen. BACKGROUND

[0002] As a device for facilitating self-administration of patients, the injection pen has been widely used in subcutaneous injection. According to different usage modes, the injection pen can be divided into a general injection pen which can be used for multiple injections and a pre-filled disposable injection pen.

[0003] In the related art, the disposable injection pen still has obvious deficiencies in needle protection and anti-bending. During assembly, the needle is not protected during the process of being sleeved by the cap, and the needle is easy to bend when the injection bottle is inserted into the lower pen body. Moreover, if the cap is not accurately docked with the lower shell during the installation of the cap, the cap is easy to bend the needle, thereby causing the needle of the injection pen to be scrapped and unable to be normally used.

[0004] Therefore, how to avoid the phenomenon of needle bending of the injection pen during assembly is a technical problem to be solved at present.

[0005] It should be noted that the above information disclosed in the background section of the present application 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 provides an assembling method of an injection pen and the injection pen.

[0007] In a first aspect, the present application provides an assembling method of an injection pen, which comprises the following steps.

[0008] putting an injection bottle into a lower shell;

[0009] resisting the needle of the injection bottle by an elastic supporting member to keep the needle vertical;

[0010] inserting a cap into the lower shell by an external force;

[0011] pushing the elastic supporting member by the cap to release the resistance to the needle, so that the needle is completely covered by the cap.

[0012] In an optional embodiment, the cap comprises:

[0013] a cap body which is inserted into the bottom of the lower shell;

[0014] a protection plug which is sleeved on the needle of the injection bottle;

[0015] A middle part of the cover body is provided with a sleeve for installing the protective plug;

[0016] A sliding groove is arranged on the side wall of the protective plug and matched with the elastic support;

[0017] When the pen cover is inserted into the lower shell by external force, the protective plug is first sleeved on the needle of the injection medicine bottle, and then the cover body is inserted into the lower shell.

[0018] In the second aspect, the disclosure provides an injection pen assembled by the assembling method of the injection pen.

[0019] The lower pen body is internally provided with an injection medicine bottle;

[0020] The upper pen body is inserted into the top of the lower shell and is provided with a pushing member to push the injection medicine bottle to inject;

[0021] The pen cover is inserted into the bottom of the lower shell to cover the needle of the injection medicine bottle of the lower pen body;

[0022] The lower pen body comprises:

[0023] The lower shell;

[0024] The sliding sleeve is slidingly arranged in the lower shell;

[0025] One end of the sliding sleeve near the upper pen body is abutted against the pushing member in the upper pen body, and the other end of the sliding sleeve extends out of the lower shell and accommodates the needle of the injection medicine bottle into the sliding sleeve;

[0026] The inner wall of one end of the sliding sleeve near the needle of the injection medicine bottle is provided with a plurality of elastic supports in the circumferential direction;

[0027] One end of the elastic support is connected with the inner wall of the sliding sleeve, and the other end is abutted against the side wall of the needle of the injection medicine bottle;

[0028] When the pen cover is inserted into the lower shell, the elastic support is pushed to release the abutment against the needle.

[0029] In an optional embodiment, the elastic support comprises:

[0030] The connecting block is arranged on the inner wall of the sliding sleeve;

[0031] One end of the abutment plate is rotationally connected with the connecting block through a rotating shaft, and a reset torsional spring is arranged on the rotating shaft;

[0032] When the reset torsional spring is in a natural state, the other end of the abutment plate is abutted against the side wall of the needle of the injection medicine bottle.

[0033] In an alternative embodiment, the abutting plate is provided with an arc-shaped notch at the end abutting the injection medicine bottle;

[0034] and the shape of the arc-shaped notch is adapted to the shape of the sidewall of the needle of the injection medicine bottle.

[0035] In an alternative embodiment, the elastic force of the reset torsion spring is F1;

[0036] the force required to bend the needle is F2;

[0037] wherein F1>F2, so as to ensure that the abutting plate keeps the needle vertical under the driving of the reset torsion spring.

[0038] In an alternative embodiment, the number of the elastic supports is 2N, wherein N is a natural number, and 1

[0039] 2N elastic supports are arranged in pairs;

[0040] The two elastic supports in each pair are arranged on the two sides of the sidewall of the needle of the injection medicine bottle and on the same diameter of the sliding sleeve.

[0041] In an alternative embodiment, the cap comprises:

[0042] a cap body inserted into the bottom of the lower shell;

[0043] a protective plug sleeved on the needle of the injection medicine bottle;

[0044] a sleeve is formed in the middle of the cap body for mounting the protective plug.

[0045] In an alternative embodiment, the sidewall of the protective plug is provided with a sliding groove at the position adapted to the elastic support;

[0046] When the protective plug is inserted into the needle of the injection medicine bottle, the elastic support is clamped into the sliding groove to guide the protective plug.

[0047] In an alternative embodiment, the sidewall of the sleeve extends axially to form a clamping member;

[0048] the clamping member is clamped at the bottom of the protective plug.

[0049] The beneficial effects of the present application are that the assembly method of the injection pen and the injection pen form multiple-point radial support by arranging multiple elastic support members on the inner wall of the sliding sleeve of the lower pen body in a circumferential direction, which continuously abut against the side wall of the injection medicine bottle needle in a natural state, protect the needle before the cap of the injection pen is assembled, prevent the needle from being bent, guide the cap by the elastic support members, improve the docking accuracy of the cap and the lower shell, thereby avoiding the needle from being bent, realizing seamless conversion of the protection function, and keeping the needle in a protection state during assembly.

[0050] Other features and advantages of the present application will be set forth in the descriptions that follow, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0051] In order to make the above-mentioned objectives, characteristics and advantages of the present application more apparent and easy to understand, the preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0053] Figure 1 An exploded view of the injection pen provided by the embodiments of the present disclosure is provided.

[0054] Figure 2 Another perspective exploded view of the injection pen provided by the embodiments of the present disclosure is provided.

[0055] Figure 3 A cross-sectional view of a partial structure of the injection pen provided by the embodiments of the present disclosure is provided.

[0056] Figure 4 A schematic view of a partial structure of the injection pen provided by the embodiments of the present disclosure is provided.

[0057] Figure 5 A cross-sectional view of the injection pen provided by the embodiments of the present disclosure is provided.

[0058] Figure 6 A flowchart of the assembly method of the injection pen provided by the embodiments of the present disclosure is provided.

[0059] In the figure: 100, lower pen body; 110, injection medicine bottle; 111, needle; 120, lower shell; 130, sliding sleeve; 140, elastic support; 141, connecting block; 142, abutting plate; 1421, arc-shaped notch; 143, rotating shaft; 144, reset torsional spring; 200, upper pen body; 210, pusher; 300, pen cover; 310, cover body; 311, sleeve; 312, clamping piece; 320, protective plug; 321, sliding groove. DETAILED DESCRIPTION

[0060] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0061] In this document, when a first component is referred to as being "on" a second component, it can be directly formed on the second component, or a third component can be interposed between the first component and the second component. Also, in the drawings, the thickness of components can be exaggerated or reduced for effective description of the technical content.

[0062] In this document, when an element or layer is referred to as being "on", "engaged to", "connected to", "attached to", or "coupled to" another element or layer, it can be directly on, engaged, connected, attached, or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly engaged to", "directly connected to", "directly attached to", or "directly coupled to" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0063] In this document, example embodiments of the present disclosure will be described in greater detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of", when preceded by terms such as "comprising" or "including", modify the phrase following the comma (i.e., "a, b, and c at least one of" means one or more of a, b, and c, one of a, b, and c, or any combination thereof). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0064] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular articles "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated 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 groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0065] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like, generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places throughout this specification do not necessarily all refer to the same embodiment. As used herein, the terms "for example," "e.g.," and the like, indicate that the named item is just one of a number of possible alternatives.

[0066] It is found through research that the disposable injection pen in the prior art does not have a protection measure during the process of setting the needle cover before the pen cap during assembly. When the injection medicine bottle is inserted into the lower pen body, the needle is easy to be bent. Moreover, if the pen cap is not accurately docked with the lower shell during the installation of the pen cap, the needle is easy to be bent by the pen cap, thereby causing the needle of the injection pen to be scrapped and unable to be normally used.

[0067] The defects of the above solutions are the results of the inventors after practice and careful research, and therefore, the discovery process of the above problems and the solutions proposed by the present disclosure for the above problems should be the contributions of the inventors to the present disclosure in the process of the present disclosure.

[0068] It should be noted that similar reference numerals and letters refer to similar items throughout the accompanying drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0069] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other as long as there is no conflict.

[0070] Please refer toFigure 6 The assembling method of the injection pen is provided by the embodiments of the present disclosure, and the assembling method comprises:

[0071] S110: the injection bottle 110 is put into the lower shell 120;

[0072] S120: the elastic support 140 is abutted against the needle 111 of the injection bottle 110 to keep the needle 111 vertical;

[0073] S130: the cap 300 is inserted into the lower shell 120 by external force;

[0074] S140: the cap 300 pushes the elastic support 140 to release the abutment against the needle 111, so that the cap 300 completely covers the needle 111.

[0075] The cap 300 comprises:

[0076] a cap body 310 which is inserted into the bottom of the lower shell 120;

[0077] a protective plug 320 which is sleeved on the needle 111 of the injection bottle 110;

[0078] a sleeve 311 is formed in the middle of the cap body 310 for installing the protective plug 320;

[0079] a sliding groove 321 is arranged on the side wall of the protective plug 320 and matched with the elastic support 140;

[0080] When the cap 300 is inserted into the lower shell 120 by external force, the protective plug 320 is sleeved on the needle of the injection bottle 110 first, and then the cap body 310 is inserted into the lower shell 120.

[0081] Please refer to Figure 1 and Figure 2, at least one embodiment also provides an injection pen assembled by the assembling method of the injection pen as described above, comprising: a lower pen body 100, in which an injection medicine bottle 110 is arranged; an upper pen body 200, which is inserted into the top of the lower shell 120 and is provided with a pushing member 210 to push the injection medicine bottle 110 to perform injection; a pen cover 300, which is inserted into the bottom of the lower shell 120 to cover the needle 111 of the injection medicine bottle 110 of the lower pen body 100; wherein the lower pen body 100 comprises: a lower shell 120; a sliding sleeve 130, which is slidingly arranged in the lower shell 120; one end of the sliding sleeve 130 close to the upper pen body 200 is abutted against the pushing member in the upper pen body 200, and the other end of the sliding sleeve 130 extends from the lower shell 120 and accommodates the needle 111 of the injection medicine bottle 110 into the sliding sleeve 130; the inner wall of one end of the sliding sleeve 130 close to the needle 111 of the injection medicine bottle 110 is provided with a plurality of elastic supporting members 140 in the circumferential direction; one end of the elastic supporting member 140 is connected with the inner wall of the sliding sleeve 130, and the other end is abutted against the side wall of the needle 111 of the injection medicine bottle 110 (as shown in Figure 5 When the pen cover 300 is inserted into the lower shell 120, the elastic supporting member 140 is pushed to release the abutment against the needle 111.

[0082] By arranging a plurality of elastic supporting members 140 on the inner wall of the sliding sleeve 130 of the lower pen body 100 in the circumferential direction, the elastic supporting members 140 continuously abut against the side wall of the needle 111 of the injection medicine bottle 110 in the natural state, forming multi-point radial support, protecting the needle 111 before the pen cover 300 of the injection pen is assembled, preventing the needle 111 from being bent, guiding the pen cover 300 by the elastic supporting member 140, improving the docking accuracy of the pen cover 300 and the lower shell 120, thereby avoiding the needle 111 from being bent, realizing seamless conversion of the protection function, and keeping the needle 111 in the protection state during assembly.

[0083] Please refer to Figure 2 and Figure 3 The elastic supporting member 140 comprises: a connecting block 141 arranged on the inner wall of the sliding sleeve 130; an abutment plate 142, one end of which is rotationally connected with the connecting block 141 through a rotating shaft 143, and a reset torsional spring 144 is arranged on the rotating shaft 143; when the reset torsional spring 144 is in the natural state, the other end of the abutment plate 142 abuts against the side wall of the needle 111 of the injection medicine bottle 110.

[0084] By cooperation of the rotating shaft 143 and the reset torsional spring 144, the abutment plate 142 can be automatically and reliably reset and clamped to the needle 111 under the action of the reset torsional spring 144, and the abutment force against the needle 111 can be ensured to keep the needle 111 vertical.

[0085] Please continue to see Figure 2 and Figure 3 The arc-shaped notch 1421 is provided on the end of the injection medicine bottle 110 abutting against the abutting plate 142, and the shape of the arc-shaped notch 1421 is matched with the shape of the sidewall of the needle 111 of the injection medicine bottle 110.

[0086] Through the design of the arc-shaped notch 1421, the contact area between the abutting plate 142 and the sidewall of the needle 111 is increased, the point contact or line contact is changed into surface contact, so that the pressure applied on the needle 111 is dispersed, the stress concentration is avoided to damage the surface of the needle 111, and meanwhile, more stable and uniform supporting force is provided, so that the effect of keeping vertical and protecting the needle 111 is better achieved.

[0087] It should be noted that the elastic force of the reset torsion spring 144 is F1, the force required for bending the needle 111 is F2, and F1>F2, so as to ensure that the abutting plate 142 keeps the needle 111 vertical under the driving of the reset torsion spring 144.

[0088] The elastic force of the reset torsion spring 144 is specifically limited, which can provide effective force required for straightening the bent needle, so as to ensure the yield rate of the product in the assembly process and reduce the risk of scrapping caused by the slight bending of the needle 111.

[0089] Please see Figure 2 and Figure 4 The number of the elastic supporting members 140 is 2N, wherein N is a natural number, and 1

[0090] In the preferred embodiment, N=2.

[0091] Through the symmetrical distribution of the plurality of supporting points, uniform and balanced radial supporting force is provided for the needle 111, so that the needle 111 is prevented from being inclined or newly bent in the protection state due to uneven force, and the needle 111 is ensured to be always in the righted state, and the reliability of protection is further improved.

[0092] Please see Figure 2 and Figure 3 The cap 300 comprises a cap body 310 which is inserted into the bottom of the lower shell 120, and a protection plug 320 which is sleeved on the needle 111 of the injection medicine bottle 110, and a sleeve 311 for installing the protection plug 320 is provided in the middle part of the cap body 310.

[0093] Need to explain, the sleeve 311 is inserted into the sliding sleeve 130.

[0094] The cap 300 is divided into a cap body 310 and a protective plug 320, and the split design makes the protective plug 320 more accurate and tightly fitted on the needle 111, providing primary sealing and protection; and the cap body 310 is responsible for the connection and fixation with the lower pen body 100. The clear division of labor optimizes the protection effect of the needle 111 and facilitates the manufacturing and assembly of the cap 300.

[0095] Please refer to 1 and Figure 3 The side wall of the protective plug 320 is provided with a sliding groove 321 at the position matched with the elastic support 140; when the protective plug 320 is inserted into the needle 111 of the injection vial 110, the elastic support 140 is clamped into the sliding groove 321 to guide the protective plug 320.

[0096] The sliding groove 321 provides a clear movement track and guidance for the elastic support 140 during the insertion of the cap 300, guiding the protective plug 320 to move axially along the correct path, so that it can be accurately fitted to the needle 111, reducing the risk of collision during installation.

[0097] Please refer to Figure 1 The side wall of the sleeve 311 extends axially to form a clamping piece 312; and the clamping piece is clamped at the bottom of the protective plug 320.

[0098] The clamping piece 312 fixes the protective plug 320 to the cap body 310, ensuring the positional stability of the protective plug 320 in the cap body 310, preventing it from loosening or falling off during use or transportation, thereby ensuring the integrity of the cap 300 and the reliability of the sealing protection. At the same time, when the cap body 310 is pulled out, the protective plug 320 can be pulled out at the same time.

[0099] In summary, the present application provides an injection pen assembly method and an injection pen. By circumferentially arranging a plurality of elastic supports 140 on the inner wall of the sliding sleeve 130 of the lower pen body 100, the elastic supports 140 continuously abut against the side wall of the needle 111 of the injection vial 110 in a natural state, forming multi-point radial support. Before the cap 300 of the injection pen is assembled, the needle 111 is protected to prevent the needle 111 from being bent. At the same time, the elastic support 140 guides the cap 300, improving the docking accuracy of the cap 300 and the lower shell 120, thereby avoiding the needle 111 from being bent, realizing seamless conversion of the protection function, and keeping the needle 111 in a protected state during assembly.

[0100] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0101] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, terms such as "first", "second" and other numerical terms are used herein, unless otherwise indicated herein. Therefore, the first element, component, region, layer or section discussed above can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0102] Spatially relative terms, such as "inner", "outer", "below", "below", "lower", "above", "upper", and the like, can be used herein to facilitate description of the relationship of one element or feature to another element or feature as illustrated in the drawings. In addition to the orientation depicted in the drawings, the spatially relative terms can be intended to cover different orientations of the device in use or operation. For example, if the device in the drawing is turned over, the element described as "below" or "under" the other element or feature will be oriented "above" the other element or feature. Therefore, the example term "below" can cover the above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0103] In the above discussion, unless otherwise stated, the terms "about", "approximately", "substantially" and the like mean a + / - 10% variation of the value when used to describe numerical values.

[0104] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant personnel can make various changes and modifications without deviating from the scope of the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined by the scope of the claims.

Claims

1. A method for assembling an injection pen, characterized in that, The lower body of the injection pen includes: a sliding sleeve, which is slidably disposed within the lower housing; one end of the sliding sleeve extends out from the lower housing and receives the needle of the injection vial into the sliding sleeve; a plurality of elastic supports are arranged circumferentially on the inner wall of the end of the sliding sleeve near the needle of the injection vial; one end of the elastic support is connected to the inner wall of the sliding sleeve, and the other end abuts against the side wall of the needle of the injection vial; The assembly method includes: The injection vial (110) is placed into the lower housing (120); The elastic support (140) abuts against the needle (111) of the injection vial (110) to keep the needle (111) vertical; The pen cap (300) is inserted into the lower housing (120) by external force. The pen cap (300) pushes the elastic support (140) to release the resistance to the needle (111), so that the pen cap (300) completely covers the needle (111).

2. The assembly method of the injection pen as described in claim 1, characterized in that, The pen cap (300) includes: The cover body (310) is inserted into the bottom of the lower housing (120); A protective plug (320) is fitted onto the needle (111) of the injection vial (110); A sleeve (311) for installing the protective plug (320) is provided in the middle of the cover body (310). The protective plug (320) has a groove (321) at the mating point between its side wall and the elastic support (140). When the pen cap (300) is inserted into the lower housing (120) by external force, the protective plug (320) is first placed on the needle of the injection vial (110), and then the cap body (310) is inserted into the lower housing (120).

3. An injection pen assembled using the assembly method described in claim 1, characterized in that, include: The lower part of the pen (100) contains an injection vial (110). The upper pen body (200) is inserted into the top of the lower housing (120) and is provided with a pusher (210) to push the injection vial (110) for injection; A pen cap (300) is inserted into the bottom of the lower housing (120) to cover the needle (111) of the injection vial (110) of the lower pen body (100); The lower pen body (100) includes: Lower housing (120); A sliding sleeve (130) is slidably disposed within the lower housing (120); The sliding sleeve (130) abuts against the pusher (210) inside the upper pen body (200) at one end near the upper pen body (200), and the other end of the sliding sleeve (130) extends out from the lower housing (120) and receives the needle (111) of the injection vial (110) into the sliding sleeve (130); The inner wall of the sliding sleeve (130) near the needle (111) of the injection vial (110) is provided with a plurality of elastic support members (140) in the circumferential direction. One end of the elastic support (140) is connected to the inner wall of the sliding sleeve (130), and the other end abuts against the side wall of the needle (111) of the injection vial (110). Furthermore, when the pen cap (300) is inserted into the lower housing (120), the elastic support (140) is pushed to release the resistance to the needle (111).

4. The injection pen as described in claim 3, characterized in that, The elastic support (140) includes: A connecting block (141) is disposed on the inner wall of the sliding sleeve (130); The abutment plate (142) is rotatably connected to the connecting block (141) via a rotating shaft (143) and a reset torsion spring (144) is provided on the rotating shaft (143). When the reset torsion spring (144) is in its natural state, the other end of the abutment plate (142) abuts against the side wall of the needle (111) of the injection vial (110).

5. The injection pen as described in claim 4, characterized in that, An arc-shaped notch (1421) is provided at one end of the abutment plate (142) that abuts against the injection vial (110). Furthermore, the shape of the arc-shaped notch (1421) is adapted to the shape of the side wall of the needle (111) of the injection vial (110).

6. The injection pen as described in claim 4, characterized in that, The spring force of the reset torsion spring (144) is F1; The force required to bend the needle (111) is F2; Wherein, F1 > F2, to ensure that the abutment plate (142) keeps the needle (111) vertical under the action of the reset torsion spring (144).

7. The injection pen as described in claim 3, characterized in that, The number of the elastic support members (140) is 2N, where N is a natural number and 1 < N ≤ 5; The 2N elastic support members (140) are arranged in pairs; Two elastic supports (140) in each group are respectively disposed on both sides of the side wall of the needle (111) of the injection vial (110) and located on the same diameter of the sliding sleeve (130).

8. The injection pen as described in claim 3, characterized in that, The pen cap (300) includes: The cover body (310) is inserted into the bottom of the lower housing (120); A protective plug (320) is fitted onto the needle (111) of the injection vial (110); The cover body (310) has a sleeve (311) in the middle for installing the protective plug (320).

9. The injection pen as described in claim 8, characterized in that, The protective plug (320) has a groove (321) at the mating point between its side wall and the elastic support (140). When the protective plug (320) is inserted into the needle (111) of the injection vial (110), the elastic support (140) engages in the groove (321) to guide the protective plug (320).

10. The injection pen as described in claim 8, characterized in that, The sleeve (311) extends axially from the side wall to form a snap-fit ​​member (312). The snap-fit ​​element (312) snaps into the bottom of the protective plug (320).

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