A cap structure for an auto-injector
By designing a protective shell and ribbed pen cap structure in the automatic injection pen, the problems of difficult installation and high cost in the prior art are solved, realizing stable installation and convenient disassembly of PFS components, reducing material and assembly costs, and improving safety and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ESC MEDTECH (SUZHOU) CO LTD
- Filing Date
- 2025-01-10
- Publication Date
- 2026-06-23
AI Technical Summary
Existing automatic injection pens have problems with cap structure that are difficult to install, have high material costs, and are complex to assemble, especially the risk of PFS breakage and hook deformation.
A pen cap structure was designed. By setting a protective shell and ribs inside the lower pen shell, and utilizing the cooperation between the ribs and the hooks, the PFS component can be stably installed and easily disassembled, avoiding deformation of the hooks, simplifying the assembly process and reducing costs.
This enables stable installation and easy disassembly of PFS components, reduces material and assembly costs, prevents hook deformation, and improves safety and ease of use.
Smart Images
Figure CN224387870U_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 pen cap structure for an automatic injection pen. Background Technology
[0002] Currently, the main function of the cap on an auto-injection pen is to remove the needle cap from the PFS (Prescription Free) device, and there are two main types:
[0003] One method relies on the strength of the pen cap itself to hold and remove the needle cap of the PFS. The disadvantage of this type of auto-injection pen is that a lot of force is required to press the PFS in, which may cause the PFS to break. At the same time, there is no obstruction behind the pen cap hook. When the pen cap is pulled to the left, the pen cap hook may deform outward, which may make it impossible to remove the needle cap.
[0004] Another approach is to split the lower pen shell of the injection pen into two parts, and then make a retaining ring in the lower pen shell to fit the hook in the pen cap, thereby ensuring the removal of the pen needle cap in the PFS. Since there is an extra part, it will increase the material cost and assembly cost. Utility Model Content
[0005] The purpose of this invention is to provide a pen cap structure for an automatic injection pen to solve the problems in the prior art. The specific technical solution is as follows:
[0006] A pen cap structure for an automatic injection pen includes a pen cap that is inserted into the front end of a lower pen housing. A protective shell is slidably connected inside the lower pen housing, and a PFS (Prescription Function) assembly is installed inside the lower pen housing. Two ribs on the protective shell abut against the two sides of a hook on the pen cap, and the front end of the hook hooks onto the protruding edge of the needle cap on the PFS assembly.
[0007] Furthermore, the lower pen shell includes a shell body, a push rod is slidably connected inside the shell body, the front end of the push rod is fixedly installed to the tail end of the PFS component, a positioning strip is provided inside the shell body, and the protective shell is slidably connected between the shell body and the positioning strip.
[0008] Furthermore, the housing body is provided with a viewing window.
[0009] Furthermore, the end of the housing body is provided with a protrusion, and after the pen cap is inserted into the front end of the housing body, the pen cap is engaged with the protrusion.
[0010] Furthermore, the protective shell includes a protective shell body, which slides within the shell body. Two ribs are fixed at one end of the protective shell body, and two tail rods are fixed at the other end of the protective shell body. The two ribs abut against both sides of the pen cap.
[0011] Furthermore, when the protective shell body moves backward to the lifted state, the two ribs separate from the hooks and move backward to abut against the end of the positioning strip, and the two tail rods move backward to abut against the end of the push rod.
[0012] Furthermore, the pen cap includes a pen cap body, with a hook fixed to the front end of the pen cap body, and two ribs respectively abutting against the two sides of the hook.
[0013] Furthermore, the outer side of the pen cap body is provided with anti-slip ridges, and the inner side of the pen cap body is provided with a groove, with the protrusion engaging in the groove.
[0014] Furthermore, the PFS component includes a PFS body, with the front end of the push rod fixedly installed at the rear end of the PFS component, and a needle provided at the front end of the PFS component.
[0015] Furthermore, a needle cap is inserted into the front end of the PFS component, which protects the needle tip inside, and the front end of the hook hooks onto the protruding edge of the end of the needle cap.
[0016] The advantages of this utility model are:
[0017] In the initial state, the two ribs on the protective shell abut against the two sides of the hook on the pen cap. First, the protective shell is lifted up and slides inside the lower pen shell. Both ribs separate from the hook, and the PFS component is installed in the lower pen shell. During the installation process, the pin cap on the PFS component pushes the hook outward. After the PFS component is installed in place, the front end of the hook hooks onto the protruding edge of the pin cap on the PFS component, and the protective shell is reset. The two ribs abut against the two sides of the hook, and the PFS component installation is now complete. The pen cap can be pulled out by the hook. The ribs prevent the hook from deforming outward due to insufficient strength, which could prevent the pin cap from being pulled out. At the same time, the structure is simple and reduces manufacturing costs. Attached Figure Description
[0018] Figure 1 This is an exploded view of the overall structure of this utility model;
[0019] Figure 2 This is a schematic diagram of the initial state of this utility model;
[0020] Figure 3 This is a schematic diagram of the protective shell of this utility model in the lifted state;
[0021] Figure 4 This is a schematic diagram showing the installation status of the PFS component of this utility model;
[0022] Figure 5 This is a schematic diagram showing the completed installation of the PFS component of this utility model;
[0023] Explanation of markings in the diagram:
[0024] Pen shell 1; shell body 101; viewing window 102; protrusion 103; positioning strip 104; protective shell 2; protective shell body 201; rib 202; tail rod 203; pen cap 3; pen cap body 301; hook 302; anti-slip rib 303; PFS assembly 4; PFS 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 1-5 As shown, a pen cap structure for an automatic injection pen includes a pen cap 3, which is inserted into the front end of a lower pen housing 1. A protective shell 2 is slidably connected inside the lower pen housing 1. A PFS component 4 is installed inside the lower pen housing 1. Two ribs 202 on the protective shell 2 abut against the two sides of the hooks 302 on the pen cap 3. The front end of the hooks 302 hooks the protruding edge of the needle cap 403 on the PFS component 4.
[0029] The working principle of the above technical solution is as follows: In the initial state, the two ribs 202 on the protective shell 2 abut against the two sides of the hooks 302 on the pen cap 3, first lifting the protective shell 2. The protective shell 2 slides inside the lower pen shell 1, and the two ribs 202 on the protective shell 2 separate from the hooks 302 on the pen cap 3. At this time, the protective shell 2 is in the lifted state. The PFS component 4 is installed in the lower pen shell 1. During the installation process, the pin cap 403 on the PFS component 4 presses the hooks 302 towards both ends. After the PFS component 4 is installed in place... The front end of the hook 302 hooks onto the protruding edge of the needle cap 403 on the PFS assembly 4. At this time, the PFS assembly 4 is installed. The protective shell 2 is reset. The two ribs 202 are respectively abutted against the two sides of the hook 302 on the pen cap 3. At this time, the assembly is completed. When the pen cap 3 is pulled out, the needle cap 403 can be pulled out through the hook 302. The ribs 202 prevent the hook 302 from deforming outward due to insufficient strength, which would prevent the needle cap 403 from being pulled out. At the same time, the structure is simple and solves the manufacturing cost problem.
[0030] When the PFS component 4 is installed inside the pen housing 1, the protective housing 2 retracts, and the two ribs 202 retract accordingly, opening up the two sides of the hook 302 on the pen cap 3 so that it can open to the sides. At this time, the needle cap 403 can easily pass over the hook 302. Then the protective housing 2 returns to its original position, preventing the hook on the pen cap 3 from deforming to the sides, thereby ensuring the needle cap can be pulled out.
[0031] Example 2
[0032] like Figures 1-5 As shown, the lower pen shell 1 includes a shell body 101, a push rod is slidably connected inside the shell body 101, the front end of the push rod is fixedly installed with the tail end of the PFS component 4, a positioning strip 104 is provided inside the shell body 101, and the protective shell 2 is slidably connected between the shell body 101 and the positioning strip 104.
[0033] The working principle of the above technical solution is as follows: When the protective shell 2 is in the lifted state, the protective shell 2 slides inside the lower pen shell 1. The two ribs 202 on the protective shell 2 separate from the hooks 302 on the pen cap 3. After the ribs 202 move to a certain preset stroke, the ends of the ribs 202 abut against the positioning strip 104 and cannot move further, thus preventing the protective shell 2 from moving excessively and causing the automatic injection pen to deform or be damaged.
[0034] Example 3
[0035] like Figures 1-5 As shown, the housing body 101 is provided with a viewing window 102;
[0036] The working principle of the above technical solution is as follows: The housing body 101 is provided with a viewing window 102, through which the PFS component 4 can be observed to see whether it is installed in place and the position of the PFS component 4 when it is pushed forward.
[0037] Example 4
[0038] like Figures 1-5 As shown, the end of the housing body 101 is provided with a protrusion 103. After the pen cap 3 is inserted into the front end of the housing body 101, the pen cap 3 is engaged with the protrusion 103.
[0039] The working principle of the above technical solution is as follows: the pen cap 3 is engaged with the protrusion 103. The protrusion 103 makes the lower pen shell 1 and the pen cap 3 more securely installed, preventing them from detaching from each other at will.
[0040] Example 5
[0041] like Figures 1-5 As shown, the protective shell 2 includes a protective shell body 201, which slides inside the shell body 101. Two ribs 202 are fixed at one end of the protective shell body 201, and two tail rods 203 are fixed at the other end of the protective shell body 201. The two ribs 202 respectively abut against both sides of the pen cap 3.
[0042] When the protective shell body 201 moves backward to the lifted state, the two ribs 202 separate from the hooks 302 and move backward to abut against the end of the positioning strip 104, and the two tail rods 203 move backward to abut against the end of the push rod.
[0043] The working principle of the above technical solution is as follows: When the protective shell 2 is in the lifted state, the protective shell 2 slides inside the lower pen shell 1. The two ribs 202 on the protective shell 2 separate from the hooks 302 on the pen cap 3. At the same time, the two tail rods 203 move backward and abut against the end of the push rod. The tail rods 203 can prevent the push rod from moving forward at will, and prevent the push rod from moving forward at will when the PFS component 4 is not installed, which would cause the PFS component 4 to be unable to be installed.
[0044] After the PFS component 4 is installed in place, the protective shell 2 is reset, the two ribs 202 abut against the two sides of the hook 302, the two tail rods 203 move and separate from the push rod, and push the push rod to move the PFS component 4 forward, so that the needle 402 protrudes outside the protective shell body 201 for easy injection.
[0045] Example 6
[0046] like Figures 1-5 As shown, the pen cap 3 includes a pen cap body 301, a hook 302 is fixed at the front end of the pen cap body 301, and two ribs 202 respectively abut against the two sides of the hook 302;
[0047] The working principle of the above technical solution is as follows: the two ribs 202 are respectively abutted on both sides of the hook 302. When the pen cap body 301 is pulled outward, the needle cap 403 is pulled out through the hook 302. The ribs 202 are designed to prevent the hook 302 from deforming outward due to insufficient strength, which would prevent the needle cap 403 from being pulled out.
[0048] Example 7
[0049] like Figures 1-5 As shown, the outer side of the pen cap body 301 is provided with anti-slip ridges 303, and the inner side of the pen cap body 301 is provided with grooves, with protrusions 103 engaging in the grooves;
[0050] The working principle of the above technical solution is as follows: the anti-slip ridge 303 increases the surface friction of the pen cap body 301, making it easier to pull out the pen cap body 301; the protrusion 103 is engaged in the groove on the shell body 101, which makes the lower pen shell 1 and the pen cap 3 more firmly installed and prevents them from separating at will.
[0051] Example 8
[0052] like Figures 1-5 As shown, the PFS component 4 includes a PFS body 401, the front end of the push rod is fixedly installed to the rear end of the PFS component 4, and the front end of the PFS component 4 is provided with a needle 402.
[0053] The front end of the PFS component 4 is connected to a needle cap 403, which protects the needle tip 402 inside. The front end of the hook 302 hooks onto the protruding edge at the end of the needle cap 403.
[0054] The working principle of the above technical solution is as follows: In the initial state, the two ribs 202 on the protective shell 2 abut against the two sides of the hooks 302 on the pen cap 3, first lifting the protective shell body 201, and the protective shell body 201 slides inside the shell body 101. The two ribs 202 separate from the hooks 302, and the PFS component 4 is installed inside the shell body 101. During the installation of the PFS component 4, the pin cap 403 on the PFS component 4 presses the hooks 302 towards both ends. After the PFS component 4 is installed in place, the front end of the hook 302 hooks the end of the pin cap 403 on the PFS component 4. At the protruding edge, the protective shell 2 is reset, and the two ribs 202 respectively abut against the two sides of the hooks 302 on the pen cap 3. At this time, the assembly is completed. When the pen cap body 301 is pulled out, the needle cap 403 can be pulled out through the hooks 302, thereby exposing the needle 402. Pushing the push rod will move the PFS component 4 forward, and the needle 402 will be exposed outside the protective shell body 201, which is convenient for injection. The ribs 202 prevent the hooks 302 from deforming outward due to insufficient strength, which would prevent the needle cap 403 from being pulled out. At the same time, the structure is simple and solves the manufacturing cost problem.
[0055] 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 cap structure for an auto-injector pen, characterized in that, Includes a pen cap (3), which is inserted into the front end of the lower pen shell (1). A protective shell (2) is slidably connected inside the lower pen shell (1). A PFS component (4) is installed inside the lower pen shell (1). Two ribs (202) on the protective shell (2) abut against the two sides of the hook (302) on the pen cap (3). The front end of the hook (302) hooks the end of the needle cap (403) on the PFS component (4).
2. A cap structure for an auto-injector pen according to claim 1, wherein, The lower pen shell (1) includes a shell body (101), a push rod is slidably connected inside the shell body (101), the front end of the push rod is fixedly installed with the tail end of the PFS component (4), a positioning strip (104) is provided inside the shell body (101), and the protective shell (2) is slidably connected between the shell body (101) and the positioning strip (104).
3. A cap structure for an auto-injector pen according to claim 2, wherein, The housing body (101) is provided with a viewing window (102).
4. A cap structure for an auto-injector pen according to claim 3, wherein, The end of the housing body (101) is provided with a protrusion (103). After the pen cap (3) is inserted into the front end of the housing body (101), the pen cap (3) is engaged with the protrusion (103).
5. A cap structure for an auto-injector pen according to claim 4, wherein, The protective shell (2) includes a protective shell body (201), which slides inside the shell body (101). Two ribs (202) are fixed at one end of the protective shell body (201), and two tail rods (203) are fixed at the other end of the protective shell body (201). The two ribs (202) abut against the two sides of the pen cap (3).
6. A cap structure for an auto-injector pen according to claim 5, wherein, When the protective shell body (201) moves backward to the lifted state, the two ribs (202) separate from the hooks (302) and move backward to abut against the end of the positioning strip (104), and the two tail rods (203) move backward to abut against the end of the push rod.
7. A cap structure for an auto-injector pen according to claim 6, wherein, The pen cap (3) includes a pen cap body (301), a hook (302) is fixed at the front end of the pen cap body (301), and two ribs (202) abut against the two sides of the hook (302).
8. A cap structure for an auto-injector pen according to claim 7, wherein, The pen cap body (301) has anti-slip ridges (303) on the outside and grooves inside, with protrusions (103) engaging in the grooves.
9. A cap structure for an auto-injector pen according to claim 8, wherein, The PFS component (4) includes a PFS body (401), the front end of the push rod is fixedly installed at the tail end of the PFS component (4), and the front end of the PFS component (4) is provided with a needle (402).
10. A cap structure for an auto-injector pen according to claim 9, wherein, The PFS component (4) has a needle cap (403) inserted at its front end. The needle cap (403) protects the needle tip (402) inside. The front end of the hook (302) hooks onto the protruding edge at the end of the needle cap (403).