Loading and unloading method for injection needle assembly, injection pen cap, and injection pen

Abstract

Provided are a loading and unloading method for an injection needle assembly (2), an injection pen cap, and an injection pen. The injection pen cap is detachably connected to an injection pen main body (3), can rotate relative to the injection pen main body (3), and comprises a pen cap body (11). A limiting cavity (12) for mounting the injection needle assembly (2) is formed in a front end of the pen cap body (11). When the injection needle assembly (2) is mounted in the limiting cavity (12), the pen cap body (11) can rotate to drive a needle base (21) of the injection needle assembly (2) to be connected to or disconnected from a front end of the injection pen main body (3). When the needle base (21) is connected to the front end of the injection pen main body (3), the pen cap body (11), when pulled off from the injection pen main body (3), can drive an outer needle cap (22) of the injection needle assembly (2) to detach from the needle base (21) of the injection needle assembly (2), or the pen cap body (11), when snapped onto the injection pen main body (3), can drive the outer needle cap (22) of the injection needle assembly (2) to re-engage with the needle base (21) of the injection needle assembly (2). A user or a processor can be prevented from being punctured, thereby improving the safety performance of the injection needle assembly (2) during use.

Description

Method for assembling and disassembling injection needle assembly, injection pen cap, and injection pen Technical Field

[0001] The invention belongs to the technical field of automatic injection, and in particular relates to a method for assembling and disassembling an injection needle assembly, an injection pen cap and an injection pen. Background Art

[0002] An insulin pen is a common insulin injection device. For example, the front end of the insulin pen is equipped with a needle, which is covered by a cap. Currently, most patients choose to use reusable insulin pens. Reusable insulin pens are reusable, and when the pen cartridge is used up, the cartridge can be replaced and reused. Insulin pens can be used for many years, or even for life.

[0003] The current steps for using an insulin pen are: 1. Remove the pen cap; 2. Unscrew the cartridge holder; 3. Retract the piston rod; 4. Install the cartridge (into the cartridge holder); 5. Attach the cartridge holder to the pen; 6. Install the needle; 7. Remove the outer and inner needle caps. Of these steps, removing the inner needle cap is the most dangerous, as it sits right next to the needle and is very small, making it easy to injure the user. Furthermore, the needle cap can easily be knocked off during needle assembly, potentially causing a puncture injury. Similarly, when removing the needle after use and needing to replace it, there's a high risk of puncturing the user's hand.

[0004] Summary of the Invention

[0005] In view of the problems existing in the above background technology, the purpose of the present invention is to provide a method for assembling and disassembling an injection needle assembly, an injection pen cap and an injection pen with good safety performance and easy use.

[0006] The technical solution adopted in the present invention is:

[0007] The injection pen cap is detachably connected to the injection pen body and can rotate relative to the injection pen body, including a pen cap body. The front end of the pen cap body is provided with a limiting cavity for installing an injection needle assembly. When the injection needle assembly is installed in the limiting cavity, the pen cap body can rotate to drive the needle seat of the injection needle assembly to connect to or leave the front end of the injection pen body; when the needle seat is connected to the front end of the injection pen body, the pen cap body can drive the outer needle cap of the injection needle assembly to separate from the needle seat of the injection needle assembly when it is pulled off the injection pen body, or drive the outer needle cap of the injection needle assembly to re-embrace the needle seat of the injection needle assembly when the pen cap body is snapped onto the injection pen body.

[0008] Furthermore, the pen cap body is provided with a pen cap cover for opening or closing the limiting cavity at a position where the limiting cavity is located.

[0009] Furthermore, one side of the pen cap cover is hinged to the pen cap body, and the other side thereof is buckled and connected to the pen cap body.

[0010] Furthermore, a groove for manually opening the pen cap cover is provided on the pen cap body at the buckling side.

[0011] Furthermore, a mark indicating the direction of rotation and connection is provided on the pen cap cover.

[0012] Furthermore, the structural shape of the limiting cavity is consistent with the structural shape of the outer surface of the outer needle cap of the injection needle assembly and can cooperate with the outer needle cap to limit the rotation of the outer needle cap.

[0013] Furthermore, the rear end surface of the limiting cavity cooperates with the end surface of the outer needle cap to axially limit the outer needle cap.

[0014] The injection pen comprises an injection pen body, on which the injection pen cap is detachably mounted, and the injection pen cap enables the injection pen assembly to be detachably connected to the injection pen body.

[0015] A method for assembling and disassembling an injection needle assembly, comprising the above-mentioned injection pen, comprises the following specific steps:

[0016] S1, remove the injection pen cap from the injection pen body, open the pen cap cover, place the injection needle assembly into the limiting cavity and cover the pen cap cover;

[0017] S2, snap the injection pen cap with the injection needle assembly installed onto the injection pen body, and tighten the injection pen cap according to the mark. At this time, the needle seat of the injection needle assembly is connected to the front end of the injection pen body;

[0018] S3, pulling out the injection pen cap from the injection pen body, at this time the injection pen cap drives the outer needle cap of the injection needle assembly to separate from the needle seat;

[0019] S4: Remove the inner needle cap from the needle holder to start administering the drug. After the drug is administered, reattach the pen cap with the outer needle cap to the pen body and loosen the pen cap by twisting it according to the mark. The needle holder with the injection needle is now separated from the front end of the pen body and is re-engaged by the outer needle cap.

[0020] S5, pulling out the injection pen cap from the injection pen body, at this time the injection pen cap drives the injection needle assembly without the inner needle cap to leave the injection pen body;

[0021] S6, open the pen cap, take out the injection needle assembly without the inner needle cap, and then put the pen cap back on, then snap the injection pen cap into the injection pen body for next use.

[0022] Furthermore, the needle seat of the injection pen assembly is threadedly connected to the front end of the injection pen body.

[0023] Compared with the prior art, the present invention has the following significant advantages: the injection pen cap not only serves as a dust-proof function but also serves as a tool for loading and unloading the injection needle assembly. The injection needle assembly does not come into contact with the injection needle during the entire loading and unloading process, thereby preventing the user or handler from being pricked and improving the safety performance of the injection needle assembly during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of the injection pen cap of the present invention;

[0025] FIG2 is a schematic diagram of the structure of the pen cap of the present invention after it is opened;

[0026] FIG3 is a schematic cross-sectional view of the structure of FIG2 ;

[0027] FIG4 is a schematic structural diagram of an injection needle assembly installed in the cap of an injection pen according to the present invention;

[0028] FIG5 is a schematic structural diagram of the injection pen of the present invention;

[0029] FIG6 is a schematic structural diagram of the injection pen of the present invention with the pen cap removed;

[0030] 7 is a schematic diagram of the installation process of the injection needle assembly of the present invention;

[0031] FIG8 is a schematic diagram of the process of removing the injection needle assembly of the present invention.

[0032] Among them, 1. Injection pen cap, 11. Pen cap body, 12. Limiting cavity, 121. Concave strip, 122. Rear end face, 13. Pen cap cover, 14. Groove, 15. Logo, 16. Fastener, 17. Buckle mouth, 2. Injection needle assembly, 21. Needle seat, 22. Outer needle cap, 3. Injection pen body. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements and equivalents within the scope of the claims.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more, unless otherwise clearly defined.

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] Example 1

[0038] Referring to Figures 1-4, this embodiment provides an injection pen cap 1, which is detachably connected to the injection pen body and can rotate relative to the injection pen body. It includes a cap body 11. The front end of the cap body 11 is provided with a limiting cavity 12 for installing the injection needle assembly 2. When the injection needle assembly 2 is installed in the limiting cavity 12, the cap body 11 can rotate to drive the needle seat of the injection needle assembly 2 to connect to or leave the front end of the injection pen body; when the needle seat is connected to the front end of the injection pen body, the cap body 11 can drive the outer needle cap of the injection needle assembly 2 to separate from the needle seat of the injection needle assembly 2 when it is pulled off the injection pen body, or drive the outer needle cap of the injection needle assembly 2 to re-embrace the needle seat of the injection needle assembly 2 when the cap body 11 is snapped onto the injection pen body.

[0039] In this embodiment, the pen cap body 11 is provided with a cap cover 13 located within the limiting cavity 12, which opens or closes the limiting cavity 12. One side of the cap cover 13 is hinged to the pen cap body 11, and the other side is snap-fitted to the pen cap body 11. Specifically, a fastener 16 is provided on the cap cover 13, and a snap-fit ​​opening 17 is provided on the pen cap body 11 at a position corresponding to the fastener 16. The fastener 16 and snap-fitting opening 17 engage with each other. A groove 14 is provided on the cap body 11 on the snap-fitting side for manually opening the pen cap cover 13. Specifically, the groove 14 is shaped like the front end of a thumb, making it easy to snap the pen cap cover 13, disengage the fastener 16 from the snap-fit ​​opening 17, and thus open the pen cap cover 13. A marking 15 indicating the direction of rotation is provided on the pen cap cover 13. Specifically, the marking 15 can be affixed to the surface of the pen cap cover 13 or engraved on the pen cap cover 13.

[0040] The limiting cavity 12 of this embodiment has a structural shape that matches the outer surface of the outer needle cap of the injection needle assembly 2 and cooperates with the outer needle cap to limit its rotation. Specifically, the outer needle cap is provided with a protruding rib, and the inner wall of the limiting cavity 12 is provided with a recessed rib 121 that cooperates with the rib to limit rotation. The rib and recessed rib 121 have the same shape and can be wrapped around the rib, so that the limiting cavity 12 embraces the outer needle cap, thereby limiting its rotation. The rear end face 122 of the limiting cavity 12 cooperates with the end face of the outer needle cap to axially limit the outer needle cap. This end face cooperation restricts the axial movement of the outer needle cap, allowing the outer needle cap to be removed from the needle holder when the pen cap body 11 is removed.

[0041] The injection pen cap of the present invention not only plays a dust-proof role but also plays a role in loading and unloading the injection needle assembly 2. The injection needle assembly 2 does not touch the injection needle during the entire loading and unloading process, thereby preventing the user or handler from being pricked, and improving the safety performance of the injection needle assembly 2 during use.

[0042] Example 2

[0043] 5 and 6 , this embodiment provides an injection pen, comprising an injection pen body 3 , on which the injection pen cap 1 described in Example 1 is detachably mounted. The injection pen cap 1 enables the injection pen assembly 2 to be detachably connected to the injection pen body 3 .

[0044] In the initial state, the injection needle assembly 2 is not installed on the injection pen body 3. When it needs to be used, the injection pen assembly 2 is connected to the injection pen body 3 through the injection pen cap 1. After use, the injection pen assembly 2 without the inner needle cap is removed through the injection pen cap 1.

[0045] The structure and function of the injection pen cap 1 can refer to those described in the first embodiment.

[0046] Example 3

[0047] 7 and 8 , a method for assembling and disassembling an injection needle assembly according to this embodiment includes the injection pen described in Example 2. The specific steps are as follows:

[0048] S1, remove the injection pen cap 1 from the injection pen body 3, open the pen cap cover 13, put the injection needle assembly 2 into the limiting cavity 12 and cover the pen cap cover 13;

[0049] S2, snap the injection pen cap 1 with the injection needle assembly 2 onto the injection pen body 3, and tighten the injection pen cap 1 by rotating it according to mark 15. At this time, the needle seat 21 of the injection needle assembly 2 is connected to the front end of the injection pen body 3;

[0050] S3, the injection pen cap 1 is pulled off the injection pen body 3, and the injection pen cap 1 drives the outer needle cap 22 of the injection needle assembly 2 to separate from the needle seat 21; that is, the outer needle cap 22 remains in the limiting cavity 12 of the injection pen cap 1;

[0051] S4, remove the inner needle cap (not shown) from the needle holder 21 to start the injection of the injection pen body 3. After the injection is completed, re-fasten the injection pen cap 1 with the outer needle cap 22 onto the injection pen body 3. Loosen the injection pen cap 1 by rotating it according to the mark 15. At this time, the needle holder 21 with the injection needle is separated from the front end of the injection pen body 3 and is re-enclosed by the outer needle cap 22.

[0052] S5, the injection pen cap 1 is pulled off the injection pen body 3, and the injection pen cap 1 drives the injection needle assembly 2 without the inner needle cap to leave the injection pen body 3;

[0053] S6: Open the pen cap cover 13, remove the injection needle assembly 2 without the inner needle cap, replace the pen cap cover 13, and then snap the injection pen cap 1 back into the injection pen body 3 for the next use. The inner needle cap and the used injection needle assembly 2 without the inner needle cap can be discarded into a designated trash can.

[0054] The needle seat 21 of the injection pen assembly 2 of this embodiment is threadedly connected to the front end of the injection pen body 3 .

[0055] The cartridge can be installed inside the injection pen body 3, in which case the needle seat 21 is connected to the front end of the injection pen body 3. Of course, the cartridge can also be directly connected to the front end of the injection pen body 3, in which case the needle seat 21 is connected to the front end of the cartridge.

[0056] The present invention uses the injection pen cap to assemble and disassemble the injection needle assembly 2. The injection needle assembly 2 does not touch the injection needle during the entire assembly and disassembly process, thereby preventing the user or handler from being pricked and improving the safety performance of the injection needle assembly 2 during use.

Claims

1. A cap for an injection pen, which is detachably connected to an injection pen body (3) and can rotate relative to the injection pen body (3), comprising a cap body (11), characterized in that: The front end of the pen cap body (11) is provided with a limiting cavity (12) for installing an injection needle assembly (2); when the injection needle assembly (2) is installed in the limiting cavity (12), the pen cap body (11) can rotate to drive the needle seat (21) of the injection needle assembly (2) to connect to or leave the front end of the injection pen body (3); when the needle seat (21) is connected to the front end of the injection pen body (3), the pen cap body (11) can be pulled off the injection pen body (3) to drive the outer needle cap (22) of the injection needle assembly (2) to separate from the needle seat (21) of the injection needle assembly (2); or when the pen cap body (11) is snapped onto the injection pen body (3), it can drive the outer needle cap (22) of the injection needle assembly (2) to re-embrace the needle seat (21) of the injection needle assembly (2).

2. The injection pen cap according to claim 1, characterized in that: The pen cap body (11) is provided with a pen cap cover (13) located in the limiting cavity (12) for opening or closing the limiting cavity (12).

3. The injection pen cap according to claim 2, characterized in that: One side of the pen cap cover (13) is hinged to the pen cap body (11), and the other side thereof is buckled and connected to the pen cap body (11).

4. The injection pen cap according to claim 3, characterized in that: A groove (14) for manually opening the pen cap cover (13) is provided on the pen cap body (11) at the buckling side.

5. The injection pen cap according to claim 2, characterized in that: The pen cap cover (13) is provided with a mark (15) indicating the rotation connection direction.

6. The injection pen cap according to claim 1, characterized in that: The structural shape of the limiting cavity (12) is consistent with the structural shape of the outer surface of the outer needle cap (22) of the injection needle assembly (2) and can cooperate with the outer needle cap (22) to limit the rotation of the outer needle cap (22).

7. The injection pen cap according to claim 6, characterized in that: The rear end surface (122) of the limiting cavity (12) cooperates with the end surface of the outer needle cap (22) to axially limit the outer needle cap (22).

8. An injection pen, comprising an injection pen body (3), characterized in that: The injection pen cap (1) according to any one of claims 1 to 7 is detachably mounted on the injection pen body (3), and the injection pen cap (1) enables the injection pen assembly (2) to be detachably connected to the injection pen body (3).

9. A method for assembling and disassembling an injection needle assembly, comprising the injection pen according to claim 8, wherein the specific steps are as follows: S1, remove the injection pen cap (1) from the injection pen body (3), open the pen cap cover (13), put the injection needle assembly (2) into the limiting cavity (12) and cover the pen cap cover (13); S2, snap the injection pen cap (1) equipped with the injection needle assembly (2) onto the injection pen body (3), and tighten the injection pen cap (1) by rotating it according to the mark (15), so that the needle seat (21) of the injection needle assembly (2) is connected to the front end of the injection pen body (3); S3, the injection pen cap (1) is pulled off the injection pen body (3), and the injection pen cap (1) drives the outer needle cap (22) of the injection needle assembly (2) to separate from the needle seat (21); S4, the inner needle cap is removed from the needle holder (21) to start drug administration of the injection pen body (3). After drug administration, the injection pen cap (1) with the outer needle cap (22) is snapped back onto the injection pen body (1), and the injection pen cap (1) is loosened by rotating according to the mark (15). At this time, the needle holder (21) with the injection needle is separated from the front end of the injection pen body (3) and is again embraced by the outer needle cap (22); S5, pulling off the injection pen cap (1) from the injection pen body (3), and at this time, the injection pen cap (1) drives the injection needle assembly (2) without the inner needle cap to leave the injection pen body (3); S6, open the pen cap cover (13), take out the injection needle assembly (2) without the inner needle cap, and then put on the pen cap cover (13), and then snap the injection pen cap (1) into the injection pen body (3) for next use.

10. A method for assembling and disassembling an injection needle assembly according to claim 9, characterized in that: The needle seat (21) of the injection pen assembly (2) is threadedly connected to the front end of the injection pen body (3).

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