Protective structure for injection pen
By employing a sliding connection structure between a protective shell and an elastic baffle in the injection pen, the problem of numerous parts and complex assembly in existing injection pens is solved, achieving a dual improvement in safety and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ESC MEDTECH (SUZHOU) CO LTD
- Filing Date
- 2025-01-14
- Publication Date
- 2026-05-19
AI Technical Summary
The existing protective structure of the injection pen is split into two parts, which increases costs and assembly risks, and the assembly process is complicated.
The protective shell is slidably connected inside the lower pen shell. The elastic baffle and guide slope work together to prevent the PFS component from moving forward, reducing the number of parts and improving safety.
By reducing the number of parts and simplifying assembly steps, costs are lowered and the safety of the injection pen is improved.
Smart Images
Figure CN224251882U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the core structure of a disposable automatic injection device in the field of self-medication, and particularly to a protective structure for an injection pen. Background Technology
[0002] Currently, to prevent PFS (Pre-Fuel Filter) from shattering and flying out during injection, causing injury, the lower pen shell is disassembled into two parts, with two elastic hooks on the internal part. During installation, the PFS is first inserted into the internal part, allowing the pen cap to pass through the hooks and engage with the front end of the PFS. Then, the entire PFS is inserted into the lower pen shell, where the two hooks on the lower pen shell are used to secure it. However, this method has the following drawbacks: splitting the part into two increases the cost due to the additional component and assembly steps; assembling the PFS also requires two steps, increasing the risk during final assembly.
[0003] For example, the auto-injector with patent application number CN202020161114.5 includes a housing 2 and a product container 13 disposed within the housing 2, the product container having a movable plunger 13b; a pushing element 7 and a first spring 9, the pushing element acting on the plunger 13b during product dispensing and the first spring acting on the pushing element 7; a signal element 11, a signal stop 12b, and a second spring 10, the second spring applying a spring force to the signal element 11 opposite to the dispensing direction. The pushing element has an inwardly protruding rib 7c on its inner side, the length of which is determined such that the first spring 9 is pre-tensioned so that the product can be dispensed outward from the product container 13 by moving the pushing element 7 with the dispensing stroke HA. However, the disadvantage of this technical solution is that it adds a part holder in the lower pen housing with two symmetrical hooks on this part, splitting the part into two, adding a part and an assembly step, increasing costs. Furthermore, assembling the PFS also requires two steps, increasing the risk of final assembly. Utility Model Content
[0004] The purpose of this invention is to provide a protective structure for injection pens to solve the problems in the prior art. The specific technical solution is as follows:
[0005] A protective structure for an injection pen includes a protective shell slidably connected to a lower pen shell. A PFS (Precision Freeze-Flat) component is installed in the lower pen shell. When the protective shell slides in the lower pen shell, an elastic baffle at the front end of the protective shell contacts a guide ramp provided in the lower pen shell. The elastic baffle is squeezed and bent inward, and supported at the neck of the PFS component, preventing the PFS component from moving forward further.
[0006] Furthermore, the lower pen shell includes a lower pen shell body, a guide slope is provided inside the lower pen shell body, and a sliding column is provided inside the lower pen shell body, with the sliding column slidably connected to the protective shell.
[0007] Furthermore, a retaining ring is provided inside the lower pen shell body, the PFS component is limited within the retaining ring, and a pen cap is inserted into the front end of the lower pen shell body.
[0008] Furthermore, the pen casing body is provided with a viewing window.
[0009] Furthermore, the pen cap includes a pen cap body, which is inserted into the front end of the lower pen shell body. The pen cap body has an inner cylinder inside, and the outer wall of the inner cylinder abuts against an elastic baffle.
[0010] Furthermore, the protective shell includes a protective body and an elastic baffle that are fixedly connected, and the protective body and the elastic baffle are slidably connected within the lower pen shell body.
[0011] Furthermore, the protective body is provided with supporting ribs. After the elastic baffle is squeezed inward by the guide slope, the elastic baffle comes into contact with the supporting ribs.
[0012] Furthermore, the protective body is provided with a sliding groove, and the sliding column slides in the sliding groove.
[0013] Furthermore, the PFS component includes a PFS component body, which is installed inside the lower pen shell body. The PFS component body is fixed by a retaining ring, and the elastic baffle is squeezed inward and bent, and snapped into the front end of the PFS component body.
[0014] Furthermore, the PFS component body has a needle at its front end, and a needle cap is inserted into the front end of the PFS component body, with the needle cap covering and protecting the needle.
[0015] The advantages of this utility model are:
[0016] When the protective shell slides inside the lower pen housing, the elastic baffle at the front end of the protective shell contacts the guide ramp inside the lower pen housing. The elastic baffle is squeezed and bent inward, and supports the neck of the PFS assembly, preventing the PFS assembly from moving forward. Since the flange of the PFS assembly is at risk of breaking, the elastic baffle can prevent the PFS assembly from being pushed out, which increases the protection function and greatly improves the safety of the injection pen. In addition, compared with the existing protection function, it reduces the number of parts and lowers the cost. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram showing the pen cap removed according to the present invention;
[0019] Figure 3 This is a schematic diagram of the press-and-inject state of this utility model;
[0020] Figure 4This is a schematic diagram of the protective shell structure of this utility model. Figure 1 ;
[0021] Figure 5 This is a schematic diagram of the protective shell structure of this utility model. Figure 2 ;
[0022] Figure 6 This is a schematic diagram of the lower pen shell structure of this utility model;
[0023] Explanation of markings in the diagram:
[0024] Pen cap 1; Pen cap body 101; Inner cylinder 102; Protective shell 2; Protective body 201; Elastic baffle 202; Support rib 203; Slide groove 204; Lower pen shell 3; Lower pen shell body 301; Guide slope 302; Sliding column 303; Fixing ring 304; PFS assembly 4; PFS assembly body 401; Needle 402; Needle cap 403. Detailed Implementation
[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] Example 1
[0028] like Figures 1-6 As shown, a protective structure for an injection pen includes a protective shell 2, which is slidably connected to a lower pen shell 3. A PFS component 4 is installed in the lower pen shell 3. When the protective shell 2 slides in the lower pen shell 3, the elastic baffle 202 at the front end of the protective shell 2 contacts the guide slope 302 provided in the lower pen shell 3. The elastic baffle 202 is squeezed and bent inward, and supports the neck of the PFS component 4, preventing the PFS component 4 from moving forward.
[0029] The working principle of the above technical solution is as follows: When the protective shell 2 slides inside the lower pen shell 3, the elastic baffle 202 at the front end of the protective shell 2 contacts the guide slope 302 provided inside the lower pen shell 3. The elastic baffle 202 is squeezed and bent inward, and supported at the neck of the PFS assembly 4, preventing the PFS assembly 4 from moving forward. When the flange of the PFS assembly 4 breaks, the elastic baffle 202 prevents the PFS assembly 4 from being pushed out, which increases the protection function and greatly improves the safety of the injection pen. In addition, compared with the existing protection function, the number of parts is reduced and the cost is lowered.
[0030] Example 2
[0031] like Figures 1-6 As shown, the lower pen shell 3 includes a lower pen shell body 301, a guide slope 302 is provided inside the lower pen shell body 301, and a sliding post 303 is provided inside the lower pen shell body 301. The sliding post 303 is slidably connected to the protective shell 2.
[0032] The working principle of the above technical solution is as follows: the lower pen shell body 301 is slidably connected to the protective shell 2 through the sliding column 303. When the lower pen shell body 301 and the protective shell 2 slide, the risk of rotation between the two is prevented.
[0033] Example 3
[0034] like Figures 1-6 As shown, a fixing ring 304 is provided inside the lower pen shell body 301, the PFS component 4 is limited within the fixing ring 304, and a pen cap 1 is inserted into the front end of the lower pen shell body 301.
[0035] The working principle of the above technical solution is as follows: the PFS component 4 is limited within the fixing ring 304, ensuring that the PFS component 4 is located in the center of the injection pen, thus ensuring the accuracy of the injection.
[0036] Example 4
[0037] like Figures 1-6 As shown, the lower pen housing body 301 is provided with a viewing window;
[0038] The working principle of the above technical solution is as follows: A viewing window is provided on the lower pen shell body 301, through which the PFS component 4 can be observed to see whether it is installed in place and the forward movement of the PFS component 4.
[0039] Example 5
[0040] like Figures 1-6 As shown, the pen cap 1 includes a pen cap body 101, which is inserted into the front end of the lower pen shell body 301. The pen cap body 101 has an inner cylinder 102 inside, and the outer wall of the inner cylinder 102 abuts against the elastic baffle 202.
[0041] The working principle of the above technical solution is as follows: the outer wall of the inner cylinder 102 abuts against the elastic baffle 202 to prevent the elastic baffle 202 from being accidentally squeezed and bent inward before the pen cap body 101 is removed. Only when the pen cap body 101 is removed and the inner cylinder 102 is separated from the elastic baffle 202 will the elastic baffle 202 be squeezed and bent inward by the guide slope 302, thus ensuring that the elastic baffle 202 cannot be bent at will.
[0042] Example 6
[0043] like Figures 1-6 As shown, the protective shell 2 includes a protective body 201 and an elastic baffle 202 fixedly connected, and the protective body 201 and the elastic baffle 202 are slidably connected inside the lower pen shell body 301;
[0044] The protective body 201 is provided with a support rib 203. After the elastic baffle 202 is squeezed inward by the guide inclined surface 302, the elastic baffle 202 comes into contact with the support rib 203.
[0045] The working principle of the above technical solution is as follows: When the protective body 201 slides inside the lower pen shell body 301, the elastic baffle 202 is squeezed inward by the guide inclined surface 302 and bent. After the elastic baffle 202 bends to a certain extent, it is blocked by the support rib 203 to prevent the elastic baffle 202 from rotating excessively.
[0046] Example 7
[0047] like Figures 1-6 As shown, the protective body 201 is provided with a sliding groove 204, and the sliding column 303 slides in the sliding groove 204;
[0048] The working principle of the above technical solution is as follows: the sliding column 303 slides in the sliding groove 204, and the lower pen shell body 301 is slidably connected to the protective body 201 through the sliding column 303 to prevent the two from rotating.
[0049] Example 8
[0050] like Figures 1-6 As shown, the PFS component 4 includes a PFS component body 401, which is installed inside the lower pen shell body 301. The PFS component body 401 is fixed by a retaining ring 304, and the elastic baffle 202 is squeezed inward and bent, and is engaged with the front end of the PFS component body 401.
[0051] The PFS component body 401 has a needle 402 at its front end and a needle cap 403 inserted into the front end of the PFS component body 401. The needle cap 403 wraps and protects the needle 402.
[0052] The working principle of the above technical solution is as follows: The PFS component 4 is installed inside the lower pen shell body 301. The pen cap body 101 is removed, and the pen cap body 101 and the lower pen shell body 301 slide apart, causing the inner cylinder 102 to slide and connect with the elastic baffle 202. The elastic baffle 202 loses the obstruction of the inner cylinder 102. The needle cap 403 is removed. During injection, the protective body 201 slides between the lower pen shell body 301, causing the guide slope 302 to squeeze the elastic baffle 202 outward. After the elastic baffle 202 bends to a certain extent, it is blocked by the support rib 203. At the same time, the elastic baffle 202 is also supported on the PFS component body 401. The needle 402 moves out of the protective body 201 for injection. Since the flange of the PFS component body 401 is at risk of breaking, the elastic baffle 202 can prevent the PFS component body 401 from being pushed out and injuring people.
[0053] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.
Claims
1. A protective structure for an injection pen, characterized in that, Includes a protective shell (2), which is slidably connected inside the lower pen shell (3). The lower pen shell (3) is equipped with a PFS component (4). When the protective shell (2) slides inside the lower pen shell (3), the elastic baffle (202) at the front end of the protective shell (2) contacts the guide slope (302) provided inside the lower pen shell (3). The elastic baffle (202) is squeezed and bent inward, and supported at the neck of the PFS component (4), preventing the PFS component (4) from moving forward.
2. The protective structure for an injection pen according to claim 1, characterized in that, The lower pen shell (3) includes a lower pen shell body (301), a guide slope (302) is provided inside the lower pen shell body (301), and a sliding column (303) is provided inside the lower pen shell body (301), and the sliding column (303) is slidably connected to the protective shell (2).
3. The protective structure for an injection pen according to claim 2, characterized in that, The lower pen shell body (301) is provided with a fixing ring (304), the PFS component (4) is limited within the fixing ring (304), and a pen cap (1) is inserted into the front end of the lower pen shell body (301).
4. The protective structure for an injection pen according to claim 3, characterized in that, The lower pen shell body (301) is provided with a viewing window.
5. A protective structure for an injection pen according to claim 4, characterized in that, The pen cap (1) includes a pen cap body (101), which is inserted into the front end of the lower pen shell body (301). The pen cap body (101) has an inner cylinder (102) inside, and the outer wall of the inner cylinder (102) abuts against the elastic baffle (202).
6. A protective structure for an injection pen according to claim 5, characterized in that, The protective shell (2) includes a protective body (201) and an elastic baffle (202) fixedly connected, and the protective body (201) and the elastic baffle (202) are slidably connected inside the lower pen shell body (301).
7. A protective structure for an injection pen according to claim 6, characterized in that, The protective body (201) is provided with a support rib (203). After the elastic baffle (202) is squeezed inward by the guide slope (302), the elastic baffle (202) comes into contact with the support rib (203).
8. A protective structure for an injection pen according to claim 7, characterized in that, The protective body (201) is provided with a sliding groove (204), and the sliding column (303) slides in the sliding groove (204).
9. A protective structure for an injection pen according to claim 8, characterized in that, The PFS component (4) includes a PFS component body (401), which is installed inside the lower pen shell body (301). The PFS component body (401) is fixed by a retaining ring (304), and the elastic baffle (202) is squeezed inward and bent, and is engaged with the front end of the PFS component body (401).
10. A protective structure for an injection pen according to claim 9, characterized in that, The PFS component body (401) has a needle (402) at its front end and a needle cap (403) inserted into the front end of the PFS component body (401), with the needle cap (403) covering and protecting the needle (402).