A hook-type injection pen cap and injection pen

Abstract

This utility model discloses a hook-type injection pen cap and injection pen, relating to the field of medical device technology. The hook-type injection pen cap includes: a cap body, with a groove on the inner edge of one end of the cap body for axial positioning by abutting against a lug on the pen shell; a connector fixedly disposed on the cap body, with multiple hooks spaced circumferentially at one end of the connector; wherein the multiple hooks are used to surround the end of the needle cap of the pre-filled syringe; an anti-detachment structure is provided at the junction of the hook-type injection pen cap and the needle sheath. The above-mentioned hook-type injection pen cap, through multiple circumferentially evenly distributed hooks, forms a multi-point, uniform wrapping of the needle cap, which can effectively adapt to needle caps of different shapes and slightly skewed. The multiple hooks increase the contact area and wrapping range with the needle cap, ensuring that even if the needle cap is slightly skewed, multiple hooks can reliably hook the needle cap simultaneously, greatly improving the success rate of cap removal.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a claw-type injection pen cap and injection pen. Background Technology

[0002] An auto-injection pen is a device that allows patients to administer medication themselves. It typically comes pre-filled with a pre-filled syringe. Before use, the needle cap at the tip of the syringe must be removed to expose the needle. Currently, a two-claw design is commonly used for removing the needle cap from the pen cap.

[0003] However, due to differences in the overall length, shape (often irregular circle), pull-out force, and permissible tilt angle of the needle caps of pre-filled syringes produced by different manufacturers, two-claw pen caps have obvious defects:

[0004] Assembly Risk: When assembling the pen cap onto the syringe, uneven force applied to the irregular or slightly misaligned needle cap by the two-pronged structure may cause the needle cap to rotate. This rotation can compromise the seal of the pre-filled syringe assembly, affecting drug quality and safety.

[0005] Risk of cap removal failure: During the cap removal process, the two claws may not be able to completely enclose the needle cap. If the needle cap is misaligned or the force is uneven during assembly, one claw may hook onto the needle cap while the other claw disengages, making it impossible to remove the needle cap smoothly, affecting user experience and injection reliability.

[0006] Therefore, how to provide a pen cap and injection pen that can adapt to different specifications of needle caps, ensure assembly stability and successful cap removal is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] The purpose of this invention is to provide a claw-type injection pen cap and injection pen, which solves the technical problems of existing technologies that commonly use a two-claw structure for pen cap removal, which cannot adapt to different sizes of needle caps and cannot smoothly remove the needle cap, thus affecting user experience and injection reliability.

[0008] To achieve the above objectives, this utility model provides a hook-type injection pen cap, comprising:

[0009] The cap body has a groove on the inner edge of one end, which is used to abut against the lug on the pen shell of the injection pen for axial positioning;

[0010] A connector is fixedly disposed on the cap body, and one end of the connector is provided with multiple hooks spaced apart circumferentially.

[0011] Among them, multiple hooks are used to surround the end of the needle cap of the pre-filled syringe;

[0012] The cap of the hook-type injection pen is designed with an anti-detachment structure at the junction with the needle sheath.

[0013] Preferably, each of the hooks has an engagement surface formed on its inner side. When the hook is subjected to an axial force in the pull-out direction, the needle cap contacts the engagement surface of the hook and applies a force to the engagement surface. The engagement surface is configured to decompose the force into a radial component that drives the hook to expand outward.

[0014] Preferably, the hook includes a connecting portion and a hooking portion, the hooking portion is located on the side of the connecting portion away from the cap body, and the hooking surface is the bottom surface of the hooking portion.

[0015] Preferably, the number of hooks is six.

[0016] Preferably, the inner side of the cap is provided with positioning ribs evenly distributed circumferentially, and the positioning ribs cooperate with the needle sleeve for positioning to maintain the coaxiality of the claw-type injection pen cap and the needle sleeve.

[0017] Preferably, the positioning ribs are evenly distributed circumferentially on the inner side of the cap body, and the positioning ribs extend along the axial direction of the cap body.

[0018] Preferably, the anti-detachment structure is a boss located on the outer side of the end of the connector away from the hook or on the inner side of the needle sheath of the injection pen, and the connector is press-fitted with the inner hole of the end of the needle sheath of the injection pen through the boss; or the anti-detachment structure is a boss located on the inner side of the cap body, and the boss is press-fitted with the outer wall of the needle sheath.

[0019] Preferably, the outer side of the cap body is provided with several raised ribs.

[0020] Preferably, the ribs are in the form of a continuous closed ring structure or a discontinuous ring structure.

[0021] This utility model also provides an injection pen, including the claw-type injection pen cap provided by any of the above technical solutions.

[0022] Compared to the aforementioned background technology, the hook-type injection pen cap provided by this utility model, after the pen cap is assembled with the injection pen, has multiple hooks at the end of the pen cap's connector surrounding the end of the pre-filled syringe needle cap. Through multiple circumferentially evenly distributed hooks, a multi-point, uniform wrapping of the needle cap is formed, which can effectively adapt to needle caps of different shapes and slightly skewed. The multiple hooks increase the contact area and wrapping range with the needle cap. Even if the needle cap is skewed to a certain extent, it can ensure that multiple hooks can reliably hook the needle cap at the same time, avoiding the single-claw disengagement phenomenon that is prone to occur in double-claw structures, and greatly improving the success rate of cap removal.

[0023] The injection pen provided by this utility model includes the aforementioned claw-type injection pen cap and has the same beneficial effects. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the cap of the hook-type injection pen provided in an embodiment of the present utility model.

[0026] Figure 2 A schematic diagram of the cap of the hook-type injection pen provided in an embodiment of this utility model from another perspective;

[0027] Figure 3 This is one of the structural diagrams of the hook-type injection pen cap installed at the back of the injection pen according to an embodiment of the present utility model;

[0028] Figure 4 This is a second schematic diagram of the structure of the hook-type injection pen cap installed at the back of the injection pen according to an embodiment of the present utility model.

[0029] Figure 5 This is the third schematic diagram of the structure of the hook-type injection pen cap installed behind the injection pen, as provided in this embodiment of the utility model.

[0030] Figures 1 to 5 Chinese figure labels:

[0031] 10. Claw-type injection pen cap; 11. Cap body; 111. Groove; 112. Rib; 113. Flange; 114. Positioning rib; 12. Connector; 121. Claw; 1211. Connecting part; 1212. Hooking part; 12121. Hooking surface; 122. Boss; 20. Pen shell; 21. Lug; 30. Needle sheath; 40. Needle cap; 50. Needle tube; 60. Needle tip. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] This invention provides a hook-type injection pen cap 10 and injection pen. Through multiple circumferentially evenly distributed hooks 121, a multi-point and uniform wrapping of the needle cap 40 is formed, which can effectively adapt to needle caps 40 with different shapes and slight tilts. The setting of multiple hooks 121 increases the contact area and wrapping range with the needle cap 40. Even if the needle cap 40 has a certain degree of tilt, it can ensure that multiple hooks 121 can reliably hook the needle cap 40 at the same time, avoiding the single-claw disengagement phenomenon that is prone to occur in double-claw structures, and greatly improving the success rate of cap removal.

[0035] Please refer to this as well. Figures 1 to 5 The hook-type injection pen cap 10 provided by this utility model includes:

[0036] The cap body 11 has a groove 111 on the inner edge of one end. The groove 111 is used to abut against the lug 21 on the pen shell 20 of the injection pen for axial positioning.

[0037] Connector 12 is fixedly mounted on cap body 11, and one end of connector 12 is provided with multiple hooks 121 spaced apart along the circumference;

[0038] Among them, multiple hooks 121 are used to surround the end of the needle cap 40 of the pre-filled syringe;

[0039] The cap 10 of the hook-type injection pen and the needle sheath 30 are provided with an anti-detachment structure.

[0040] A pre-filled syringe for an injection pen typically includes a syringe barrel 50 and a needle 60. The syringe barrel 50 contains the medication to be injected, and a piston is slidably connected inside the syringe barrel 50. During use, the piston pushes the medication out of the syringe barrel 50 and into the needle 60 for injection. The needle 60 of the pre-filled syringe is equipped with a needle cap 40, which ensures the sterility and seal of the needle 60 before injection. Additionally, the front end of the pen casing 20 has a sleeve-shaped needle sheath 30, which conceals the needle 60 and prevents accidental puncture wounds.

[0041] The function of the hook-type injection pen cap 10 is to allow the needle cap 40 to be pulled out simultaneously during injection. The cap body 11 of the hook-type injection pen cap 10 is a cylindrical structure with one end closed, and the connector 12 is a cylindrical structure. The cap body 11 and the connector 12 are integrally set, and the connector 12 is fixedly set inside the bottom of the cap body 11. The connector 12 and the cap body 11 are located on the same central axis. The hooks 121 are set at the top of the connector 12. There are more than two hooks 121, and the multiple hooks 121 are evenly distributed on the connector 12. Before the injection pen is used, the cap body 11 is installed on the injection pen, and the connector 12 is at least partially inserted into the needle sleeve 30. The hook-type injection pen cap 10 is connected to the needle sleeve 30 through an anti-drop structure. The groove 111 set on the inner edge of one end of the cap body 11 abuts against the lug 21 on the pen shell 20 of the injection pen, thereby performing axial positioning to ensure the hook-type injection pen cap 10 is securely attached. Once the pen cap 10 is installed, the multiple claws 121 at the end of the connector 12 penetrate into the gap between the shoulder of the needle tube 50 of the pre-filled syringe and the end of the needle cap 40. The multiple claws 121 surround the end of the needle cap 40 of the pre-filled syringe. During injection, by pulling out the pen cap 10, the multiple claws 121 contact the end of the needle cap 40, ultimately moving the needle cap 40 away from the needle tube 50, thereby removing the needle cap 40.

[0042] This design, with multiple circumferentially evenly distributed hooks 121, forms a multi-point, uniform wrap around the needle cap 40, effectively adapting to different shapes (including irregular circles) and slightly skewed needle caps 40. The multiple hooks 121 increase the contact area and wrapping range with the needle cap 40, ensuring that even if the needle cap 40 is skewed to a certain extent, multiple hooks 121 can reliably hook the needle cap 40 simultaneously, avoiding the single-claw disengagement phenomenon that easily occurs in double-claw structures, and greatly improving the success rate of removing the cap.

[0043] In some embodiments, an engagement surface 12121 is formed on the inner side of each claw 121. When the claw 121 is subjected to an axial force in the pull-out direction, the needle cap 40 contacts the engagement surface 12121 of the claw 121 and applies a force to the engagement surface 12121. The engagement surface 12121 is configured to decompose the force into a radial component that drives the claw 121 to expand outward.

[0044] Please refer to this as well. Figure 1 , Figure 2 and Figure 4Each claw 121 has an inclined engagement surface 12121 on its inner side. When the user pulls the pen cap outward along the axial direction, the engagement surface 12121 of the claw 121 contacts the needle cap 40. Since the engagement surface 12121 is inclined, the needle cap 40 applies a force F to the engagement surface 12121. This force F can be decomposed into an axial component force F1 (opposite to the direction of pulling the cap, resisting the pulling) and a radial component force F2 (perpendicular to the axial direction, causing the claw to expand outward). The radial component force F2 forces the claw 121 to expand elastically outward in sync. This makes the claw 121 hold the needle cap 40 more tightly to prevent slippage. On the other hand, it ensures that the force acting on the needle cap 40 is evenly distributed when pulling the cap, avoiding the needle cap 40 from tilting or rotating, thereby reliably pulling out the needle cap 40.

[0045] In some embodiments, the hook 121 includes a connecting portion 1211 and a hooking portion 1212, the hooking portion 1212 being located on the side of the connecting portion 1211 away from the cap body 11, and the hooking surface 12121 being the bottom surface of the hooking portion 1212.

[0046] Please refer to this as well. Figure 1 , Figure 2 and Figure 4 The hook 121 is integrally formed with the connector 12. The connecting part 1211 of the hook 121 is integrally formed with the connector 12. The hooking part 1212 extends toward the center side of the connector 12. The bottom surface of the hooking part 1212 is the hooking surface 12121.

[0047] In some embodiments, the number of hooks 121 is six.

[0048] Please refer to this as well. Figures 1 to 2 In this embodiment, there are six hooks 121, which are evenly distributed at equal intervals at the end of the connector 12. These six hooks 121 form a multi-point, even wrapping around the needle cap 40, ensuring sufficient contact area and wrapping range. Even if the needle cap 40 is slightly tilted, multiple hooks 121 can reliably hook onto it simultaneously, greatly improving the success rate of cap removal. In other embodiments, the number of hooks 121 can be set according to factors such as the size of the needle sheath 30, and can be four, five, or more; the specific number is not limited.

[0049] In some embodiments, positioning ribs 114 are uniformly arranged circumferentially on the inner side of the cap 11. The positioning ribs 114 cooperate with the needle sleeve 30 for positioning, so as to maintain the coaxiality of the cap 10 of the claw-type injection pen and the needle sleeve 30.

[0050] Please refer to this as well. Figures 1 to 2When the cap 10 of the hook-type injection pen is installed on the injection pen, the connector 12 is inserted into the needle sleeve 30, and the positioning rib 114 on the inner side of the cap 11 is located on the outer side of the needle sleeve 30 to limit and position the needle sleeve 30, and maintain the coaxiality of the cap 10 and the needle sleeve 30.

[0051] In some embodiments, the positioning ribs 114 are uniformly arranged circumferentially on the inner side of the cap body 11, and the positioning ribs 114 extend along the axial direction of the cap body 11.

[0052] Please refer to this as well. Figures 1 to 2 The positioning rib 114 has a strip-shaped structure and extends upward from the inner bottom surface of the cap 11 along the axis of the cap 11. This design provides better positioning and limiting performance and ensures the coaxiality of the claw-type injection pen cap 10 and the needle sleeve 30.

[0053] In some embodiments, the anti-detachment structure is a boss 122 located on the outer side of the end of the connector 12 away from the hook 121 or on the inner side of the needle sleeve 30 of the injection pen, and the connector 12 is press-fitted with the inner hole of the end of the needle sleeve 30 of the injection pen through the boss 122; or the anti-detachment structure is a boss 122 located on the inner side of the cap 11, and the boss 122 is press-fitted with the outer wall of the needle sleeve 30.

[0054] Please refer to this as well. Figures 2 to 5 In this embodiment, the anti-detachment structure is a boss 122 located on the outer side of the end of the connector 12 away from the hook 121. For hook-type injection pen caps 10 with positioning ribs 114 on the inner side of the cap body 11, the boss 122 can also be located on the positioning ribs 114. The above-mentioned anti-detachment structure ensures a reliable connection between the hook-type injection pen cap 10 and the needle sleeve 30, preventing detachment.

[0055] The following explanation uses the example of the boss 122 being located on the connector 12. When the hook-type injection pen cap 10 is installed on the injection pen, the cap is pressed into the front end of the pen shell 20, and the lug 21 on the pen shell 20 is engaged in the groove 111 of the cap body 11, completing axial positioning. At the same time, the connector 12 is inserted into the needle sleeve 30. The connector 12 achieves initial fixation through the interference fit between the outer boss 122 and the inner hole at the end of the needle sleeve 30. The interference fit between the boss 122 and the inner hole of the needle sleeve 30 ensures the stability of the pen cap when not in use, preventing it from accidentally loosening.

[0056] In some embodiments, the outer side of the cap body 11 is provided with a plurality of protruding ribs 112.

[0057] Please refer to this as well. Figures 1 to 5The raised ribs 112 are evenly and spaced on the outer side of the cap body 11. By setting the raised ribs 112, when the user pulls the needle cap 40 outward by holding the cap body 11, the raised ribs 112 on the outer side of the cap body 11 can increase the friction between the cap body 11 and the user's palm, prevent slippage, and make the needle cap 40 easier to pull out.

[0058] In addition, a flange 113 is formed on the bottom outer side of the cap body 11. The flange 113 has a ring structure. By setting the flange 113, when the user holds the cap body 11, the user's palm can resist the flange 113, making it easier for the user to exert force.

[0059] In some embodiments, the rib 112 is a continuous closed ring structure or a discontinuous ring structure.

[0060] Please refer to this as well. Figures 1 to 5 In this embodiment, a single rib 112 is a continuously closed annular structure. In other embodiments, a single rib 112 may also include several arc-shaped structures distributed on the same circumference, but with gaps between adjacent arc-shaped structures, forming a discontinuous annular structure. The function of the rib 112 is to increase the friction between the user's palm and the outer side of the cap 11 when the user holds the cap 11. The rib 112 may also have other structural forms, which are not specifically limited.

[0061] In addition to the claw-type injection pen cap 10 disclosed in the above embodiments, this utility model also provides an injection pen including the above-mentioned claw-type injection pen cap 10. The specific features of the other structures of the injection pen, except for the structure that cooperates with the claw-type injection pen cap 10, can be referred to the prior art, and will not be repeated here.

[0062] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0063] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A latching syringe pen cap, characterized in that include: The cap body (11) has a groove (111) on the inner edge of one end. The groove (111) is used to abut against the lug (21) on the pen shell (20) of the injection pen for axial positioning. A connector (12) is fixedly disposed on the cap body (11), and one end of the connector (12) is provided with a plurality of hooks (121) spaced apart along the circumferential direction; Among them, a plurality of the hooks (121) are used to surround the end of the needle cap (40) of the pre-filled syringe; The cap (10) of the hook-type injection pen and the needle sheath (30) are provided with an anti-detachment structure.

2. The clicker pen cap of claim 1, wherein, Each of the hooks (121) has an engagement surface (12121) formed on its inner side. When the hook (121) is subjected to an axial force in the pull-out direction, the needle cap contacts the engagement surface (12121) of the hook and applies a force to the engagement surface (12121). The engagement surface (12121) is configured to decompose the force into a radial component that drives the hook to expand outward.

3. The clicker pen cap of claim 2, wherein, The hook (121) includes a connecting part (1211) and a hooking part (1212). The hooking part (1212) is located on the side of the connecting part (1211) away from the cap body (11). The hooking surface (12121) is the bottom surface of the hooking part (1212).

4. The clicker pen cap of claim 1, wherein, The number of hooks (121) is six.

5. The clicker pen cap of claim 1, wherein, The inner side of the cap (11) is uniformly provided with positioning ribs (114) along the circumference. The positioning ribs (114) cooperate with the needle sleeve (30) for positioning, so as to maintain the coaxiality of the claw-type injection pen cap (10) and the needle sleeve (30).

6. The clicker pen cap of claim 5, wherein, Positioning ribs (114) are evenly arranged circumferentially on the inner side of the cap body (11), and the positioning ribs (114) extend along the axial direction of the cap body (11).

7. The clicker pen cap of claim 1, wherein The anti-drop structure is a boss (122) located on the outer side of the end of the connector (12) away from the hook (121) or on the inner side of the needle sleeve (30) of the injection pen. The connector (12) is press-fitted with the inner hole of the end of the needle sleeve (30) of the injection pen through the boss (122); or the anti-drop structure is a boss (122) located on the inner side of the cap (11). The boss (122) is press-fitted with the outer wall of the needle sleeve (30).

8. The clicker pen cap of claim 1, wherein, The outer side of the cap body (11) is provided with several protruding ribs (112).

9. The clicker pen cap of claim 8, wherein, The rib (112) has a continuous closed ring structure or a discontinuous ring structure.

10. An injection pen characterized in that Includes the cap (10) of the claw-type injection pen as described in any one of claims 1 to 9.

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