Cap and injection assembly
By designing an unrepeatable pen cap structure, the problem of misuse of the injection device was solved, achieving single-use warnings and safety that is perceptible to the elderly, while reducing the risk of drug deterioration and infection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SUZHOU HENGRUI HONGYUAN MEDICAL TECH CO LTD
- Filing Date
- 2022-10-09
- Publication Date
- 2026-07-31
AI Technical Summary
The caps on existing injection devices can be reapplied, leading to misuse of disposable injection pens. Furthermore, elderly people have difficulty accurately identifying used injection pens, posing a risk of medication deterioration and cross-infection.
Design a pen cap including a pen cap body, a support post and a wing. The second end of the support post extends into the injection pen. The wing expands after being pulled out and cannot be reattached. The pen cap is restricted from separating from the injection pen by a hook and a positioning groove, prompting the user to use it immediately.
To prevent the reuse of injection pens, elderly people can use their sense of touch to recognize when the pen cap has been removed, reducing the risk of medication deterioration and cross-infection.
Smart Images
Figure CN115554529B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and more particularly to a pen cap and injection assembly. Background Technology
[0002] With the development of technology and the progress of society, people have higher demands for the use of injection devices. They hope that the operation steps during injection are simple and that misoperation can be minimized. In practice, after opening the syringe casing or removing the pen cap, patients are often unable to complete the injection immediately due to various reasons. At this time, patients may close the injection device packaging or put the pen cap back on. However, the needle of the injection device is already exposed to the air, and prolonged static exposure can cause the medication to deteriorate and cause cross-infection. In addition, if medical consumables are not disposed of properly after the injection, and the operator mistakenly puts the pen cap back on, restoring the pen to its original state before injection, it will result in the reuse of the disposable injection pen.
[0003] Currently, injection pens on the market use a viewing window to determine whether the medication has been finished. However, this method is not effective or accurate for elderly people with blurred vision or eye diseases in distinguishing between unused and used injection pens.
[0004] For example, the existing Chinese patent application document with publication number CN111282094B discloses an automatic injection device, see [link / reference]. Figure 1 and Figure 2 The proximal end cap 11 is generally cylindrical in shape, with an internal cavity, and has an end face at one end and an open end at the other. The proximal end cap 11 has two opposing protrusions 1101 on the inner surface of the end face. The two protrusions 1101 are used to engage with the corresponding grooves 1202 of the trigger sleeve 12, ensuring that the proximal end cap 11 and the trigger sleeve 12 are securely nested.
[0005] For example, Chinese patent application CN111150906B discloses a two-step automatic injection device. (See also...) Figure 3 The syringe protective cap 12 has an annular protrusion 1201 on the inner wall of the connecting end, and a lip is provided on the outer wall of the near end of the outer shell 10. When the syringe protective cap 12 is put on the near end of the outer shell 10, the annular protrusion 1201 is locked in the lip to achieve a detachable connection.
[0006] The disadvantage of the two-step automatic injection device in the above two technical solutions is that the protective cap of the injection pen can be put back on after being pulled out. Especially for disposable automatic injection devices, this restores the device to its original state before injection, which can easily lead to misunderstandings for the operator and cause repeated use.
[0007] Therefore, this application proposes an improved pen cap and injection assembly, wherein the pen cap, once removed from a disposable injection pen, cannot be reinstalled, thereby alerting patients to use the pen immediately and preventing the reuse of the disposable injection pen. Summary of the Invention
[0008] The purpose of this application is to provide a pen cap and injection component, wherein the pen cap, once removed, cannot be reattached to the injection pen body, thereby alerting the patient to use it immediately.
[0009] A first aspect of this application provides a pen cap, comprising: a pen cap body having a sealing cavity, the pen cap body being used to cover an injection pen, the injection pen including an injection pen body having an opening, the pen cap body being used to close the opening; a support post disposed in the sealing cavity, a first end of the support post being connected to the inner end face of the pen cap body, and a second end of the support post extending into the injection pen body through the opening when the pen cap body is placed on the injection pen; and a wing protruding from the outer wall of the support post, the wing including a first end connected to the support post and a free end extending toward the first end of the support post, and the free end having a facing direction towards the injection pen body. The second end of the support column has a bent hook portion, wherein when the pen cap body is placed on the injection pen, the free end of the wing elastically abuts against the inner wall of the injection pen body. During the process of removing the pen cap body, the free end of the wing is squeezed towards the support column, thereby allowing the support column to pass through the opening. After the pen cap is separated from the injection pen, the free end of the wing expands in a direction away from the support column, preventing the support column from passing through the opening. Furthermore, after the pen cap is separated from the injection pen, during the process of re-placing the pen cap body on the injection pen, the hook portion engages in a groove on the injection pen body, preventing the support column from passing through the opening.
[0010] A second aspect of this application provides an injection assembly, the injection assembly comprising: an injection pen including an injection pen body having an opening; and a pen cap as described in any of the preceding claims, the pen cap covering the injection pen and closing the opening.
[0011] The beneficial effects of this application are as follows: By setting the pen cap to include a pen cap body, a support column, and a wing, after the pen cap body is pulled out, the wing expands in the direction away from the support column and cannot pass through the opening. The user cannot easily put the pen cap body back on the injection pen body, which warns the user to use it immediately. In addition, for elderly people with poor eyesight, since the pen cap body can no longer be put back on the injection pen body, they can identify the injection pen body that has been pulled out by touch. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a schematic diagram of the proximal cap of an automated injection device in the prior art;
[0014] Figure 2 This is a schematic diagram of the trigger sleeve in an existing automatic injection device;
[0015] Figure 3 This is a schematic diagram of the exploded structure of a two-step automatic injection device in the prior art;
[0016] Figure 4 This is an exploded structural diagram of one embodiment of the injection component of this application;
[0017] Figure 5 for Figure 4 A schematic diagram of the exploded structure of a syringe pen;
[0018] Figure 6 for Figure 4 A schematic diagram of one embodiment of the pen cap;
[0019] Figure 7 for Figure 5 A schematic diagram of the structure when the protective sleeve is at the first angle;
[0020] Figure 8 for Figure 4 A schematic diagram of the structure of the injection component in its first state;
[0021] Figure 9 for Figure 8 A cross-sectional view of the injection unit along the AA direction;
[0022] Figure 10 for Figure 4 A schematic diagram of the structure of the injection component in its second state;
[0023] Figure 11 for Figure 10 A cross-sectional view of the injection unit along the BB direction;
[0024] Figure 12 for Figure 5 A schematic diagram of the structure when the middle protective sleeve is at the second angle;
[0025] Figure 13 for Figure 6Right view of the pen cap;
[0026] Figure 14 for Figure 6 Left view of the pen cap. Detailed Implementation
[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0028] See Figures 4 to 5 In one embodiment of this application, the injection assembly 100 includes an injection pen 1 and a pen cap 2. The injection pen 1 includes an injection pen body 10 and a needle cap 101 located inside the injection pen body 10. The injection pen body 10 has an opening 106. The pen cap 2 covers the injection pen 1, closing the opening 106. Meanwhile, the injection pen body 10 includes a housing 102, an injection needle 103, and a protective sleeve 104.
[0029] Specifically, the injection pen body 10 is a device for injection. The housing 102 has an opening 108 through which the injection needle 103 and the protective sleeve 104 are installed inside the housing 102.
[0030] The injection needle 103 is at least partially located inside the housing 102, and the needle tip of the injection needle 103 extends from the opening 108 to the outside of the housing 102. A needle cap 101 is placed on the needle tip. Specifically, the injection needle 103 is used to contain a drug. The needle cap 101 can be placed on the needle tip by means of a slot connection, a threaded connection, etc.
[0031] The protective sleeve 104 is located around the injection needle 103 and at least partially inside the housing 102, with an opening 106 on the end face of the protective sleeve 104. Specifically, the protective sleeve 104 is connected to the housing 102 by a threaded connection or a slot connection, and the pen cap 2 is connected to the injection pen body 10 through the opening 106.
[0032] In other embodiments, the injection pen body 10 also includes other components such as a pusher and a locking component. The locking component prevents the injection assembly 100 from being accidentally triggered by environmental disturbances such as impacts or vibrations in its original state. The pusher delivers the medication inside the injection assembly 100 through the injection needle 103 to the outside of the injection assembly 100 or into a human / animal body. Details are omitted here.
[0033] See Figure 6The pen cap 2 includes a pen cap body 20, a support post 21, a protrusion 22, and a wing 23.
[0034] The pen cap body 20 has a cap cavity, and the pen cap body 20 is used to cover the injection pen 1.
[0035] Specifically, the pen cap body 20 is a common pen cap style. When the pen cap body 20 is placed on the injection pen 1, the internal cavity becomes the capping cavity, and the pen cap body 20 provides protection for the injection pen 1.
[0036] The support post 21 is disposed in the cap cavity. The support post 21 is configured as a hollow structure along the axial direction. The first end of the support post 21 is connected to the inner end face of the pen cap body 20. When the pen cap body 20 is placed on the injection pen 1, the second end of the support post 21 extends into the injection pen body 10 through the opening 106.
[0037] Specifically, the support column 21 is a cylindrical object. The first end and the second end of the support column 21 are opposite to each other. The support column 21 is hollow along the axial direction, and the radial direction of the support column 21 is smaller than the radial direction of the injection pen body 10. When the pen cap body 20 is placed on the injection pen 1, the second end of the support column 21 extends into the injection pen body 10 through the opening 106.
[0038] The protrusion 22 protrudes from the second end of the support column 21 and bends toward the support column 21. When the pen cap body 20 is placed on the injection pen 1, the protrusion 22 locks the needle cap 101. During the process of pulling off the pen cap body 20, the protrusion 22 drives the needle cap 101, causing the needle cap 101 to separate from the injection pen body 10 through the opening 106.
[0039] See Figure 9 , Figure 9 This is a cross-sectional view of the injection assembly 100 in its initial state. Specifically, the protrusion 22 is a cylindrical object, which bends towards the support column 21 to form a hook. When the pen cap body 20 is placed on the injection pen 1, the hook of the protrusion 22 engages with the bottom edge 1011 of the needle cap 101. During the process of removing the pen cap body 20, the protrusion 22 pulls the needle cap 101, causing the needle cap 101 to separate from the injection pen body 10 through the opening 106. It can be seen that removing the pen cap body 20 also pulls out the needle cap 101, reducing the step that the user needs to take to remove the needle cap 101 separately.
[0040] The wing 23 protrudes from the outer wall of the support column 21. When the pen cap body 20 is placed on the injection pen 1, the wing 23 elastically abuts against the inner wall of the injection pen body 10. During the process of pulling off the pen cap body 20, the wing 23 is squeezed and passes through the opening 106. After the pen cap 2 is separated from the injection pen 1, the wing 23 expands in the direction away from the support column 21 and cannot pass through the opening 106.
[0041] Specifically, the wing 23 has a sheet-like structure. The wing 23 can be elastically abutted against the inner wall of the injection pen body 10 by having a slot on the inner wall of the injection pen body 10, into which the wing 23 is inserted.
[0042] Specifically, the wing 23 expands in the direction away from the support post 21, meaning the wing 23 is tilted outwards. When the pen cap body 20 is placed on the injection pen 1, the wing 23 needs to be manually and elastically deformed to allow it to pass through the opening 106. After the pen cap body 20 is pulled out, the wing 23 returns to its original shape, that is, the wing 23 returns to its expanded shape in the direction away from the support post 21. At this time, the wing 23 can no longer pass through the opening 106. It can be seen that after the pen cap body 20 is pulled out, the user cannot easily put the pen cap body 20 back on the injection pen body 10, which warns the user to use it immediately and allows the user to identify by touch that the injection pen body 10 has had its pen cap body 20 pulled out.
[0043] As can be seen from the above, the pen cap 2 of this application includes a pen cap body 20, a support post 21, a protrusion 22, and a wing 23. The protrusion 22 holds the needle cap 101 in place, and pulling out the pen cap body 20 causes the needle cap 101 to be pulled out as well, reducing the step that the user needs to pull out the needle cap 101 again. At the same time, after the pen cap body 20 is pulled out, the wing 23 expands away from the support post 21 and cannot pass through the opening 106. The user cannot easily put the pen cap body 20 back on the injection pen body 10, which warns the user to use it immediately. In addition, for elderly people with poor eyesight, since the pen cap body 20 can no longer be put on the injection pen body 10, they can identify by touch that the injection pen body 10 has been pulled out.
[0044] Continue reading Figure 6 The flying wing 23 includes a first end 231 connected to the support column 21 and a free end 232 extending to the first end of the support column 21. When subjected to external force, the free end 232 of the flying wing 23 moves closer to the support column 21.
[0045] Specifically, the first end 231 and the free end 232 of the wing 23 are the two ends of the wing 23 that are arranged opposite to each other. When subjected to external force, the free end 232 of the wing 23 moves closer to the support column 21. The application scenario is that when the pen cap body 20 is placed on the injection pen 1, the wing 23 is subjected to external force, and the free end 232 of the wing 23 moves closer to the support column 21, so the wing 23 can be inserted into the injection pen body 10.
[0046] See Figures 6 to 14 The free end 232 of the wing 23 is provided with a hook portion 233 that bends toward the second end of the support column 21.
[0047] When the pen cap body 20 is placed on the injection pen 1, the hook part 233 elastically abuts against the inner wall 105 of the injection pen body 10. After the pen cap 2 is separated from the injection pen 1, during the process of placing the pen cap body 20 back on the injection pen 1, the hook part 233 is engaged in the slot 1041 on the injection pen body 10 and cannot pass through the opening 106.
[0048] Specifically, the hook portion 233 of the wing 23 is first elastically deformed so that it elastically abuts against the inner wall 105 of the pen body 10. The limiting principle is that the hook portion 233 of the wing 23 has an outward tension, while the inner wall 105 of the pen body 10 gives it an inward contraction reaction force, thereby achieving the limiting effect.
[0049] Continue reading Figure 9 The hook portion 233 is provided with an outer inclined surface 2331 that matches the inner wall 105 of the injection pen body 10, and an inner inclined surface 2332 that matches the slot 1041.
[0050] Specifically, the outer bevel 2331 of the hook portion 233 matches the inner wall 105 of the injection pen body 10, that is, the angle between the outer bevel 2331 and the inner wall 105 is the same. During the process of pulling out the pen cap 2, the outer bevel 2331 of the wing 23 slides against the inner wall 105 of the protective sleeve 104, forcing the wing 23 to deform inward. When the wing 23 moves away from the protective sleeve 104, the wing 23 returns to its original shape.
[0051] See Figure 11 , Figure 11 This is a cross-sectional view of the injection component 100 when it cannot be restored. After the wing 23 is restored to its original state, the inner bevel 2332 of the hook portion 233 matches the slot 1041, that is, the angle between the inner bevel 2332 of the hook portion 233 and the slot 1041 is the same. The inner bevel 2332 of the hook portion 233 will be embedded in the slot 1041, that is, the inner bevel 2332 fits the slot 1041, preventing the wing 23 from moving deeper into the slot 1041, so the pen cap 2 cannot be restored.
[0052] See Figures 6 to 7 The pen cap 2 further includes a positioning part 25. The positioning part 25 protrudes from the outer wall of the support column 21, and the injection pen body 10 is provided with a positioning groove 26 that matches the positioning part 25.
[0053] During the process of repositioning the pen cap 20 onto the injection pen 1 after the pen cap 2 is separated from the injection pen 1, the positioning part 25 is positioned in the positioning groove 26.
[0054] Specifically, the positioning part 25 is a rib or other structure for limiting the position. The positioning groove 26 is a groove that matches the size of the positioning part 25. The connection between the positioning part 25 and the positioning groove 26 achieves the limiting function between the pen cap 2 and the injection pen body 10.
[0055] In one embodiment, there are two protrusions 22, which are symmetrically arranged about the axis of the support column 21. There are also two flying wings 23, which are symmetrically arranged about the axis of the support column 21.
[0056] In other words, the two protrusions 22 are at 180°. The two protrusions 22 simultaneously engage the needle cap 101, which improves the stability under stress. The two wings 23 are at 180°. The two wings 23 simultaneously engage the injection pen body 10, which also improves the stability under stress.
[0057] In other embodiments, the number of protrusions 22 and flying wings 23 may be one, two, three, four, etc. This application does not limit the number of protrusions 22 and flying wings 23.
[0058] In one embodiment, the support column 21, the protrusion 22, and the flying wing 23 are integrally formed. In other embodiments, the support column 21, the protrusion 22, and the flying wing 23 can also be connected by other methods such as adhesive or snap-fit.
[0059] In one embodiment, both the protrusion 22 and the wing 23 are made of an elastic material, such as silicone. In other embodiments, the protrusion 22 and the wing 23 are each made of either an elastic or a rigid material.
[0060] Specifically, the protrusion 22 and the flying wing 23 can be made of materials with high elasticity, such as polyethylene and polypropylene. Other materials with higher rigidity can also be selected, such as polycarbonate and polybutylene terephthalate.
[0061] In addition, this application also protects the pen cap 2 mentioned above, the specific structure of which can be found above and will not be described in detail here.
[0062] It should be noted that the pen cap 2 mentioned above is not only used in this injection assembly 100, but can also be set in other devices, and this application does not limit it.
[0063] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. An injection assembly characterized by, The injection assembly includes: An injection pen, including an injection pen body, wherein the injection pen body has an opening; Pen cap, the pen cap being disposed on the injection pen, the pen cap comprising: The pen cap body forms a covered cavity, the pen cap body is used to cover the injection pen, and the pen cap body is used to close the opening; A support post is disposed in the capping cavity. The first end of the support post is connected to the inner end face of the pen cap body. When the pen cap body is placed on the injection pen, the second end of the support post extends into the injection pen body through the opening. A wing protrudes from the outer wall of the support column. The wing includes a first end connected to the support column and a free end extending toward the first end of the support column. The free end has a hook portion that bends toward the second end of the support column. When the pen cap body is placed on the injection pen, the free end of the wing elastically abuts against the inner wall of the injection pen body. During the process of removing the pen cap body, the free end of the wing is squeezed toward the support column, allowing the support column to pass through the opening. After the pen cap is separated from the injection pen, the free end of the wing expands away from the support column, preventing the support column from passing through the opening. After the pen cap is separated from the injection pen, during the process of re-placing the pen cap body on the injection pen, the hook portion engages in a groove on the injection pen body, preventing the support column from passing through the opening.
2. The injection assembly of claim 1, wherein, The hook portion is provided with an outer bevel; When the pen cap body is placed on the injection pen, the outer bevel is in contact with the inner wall of the injection pen body. During the process of removing the pen cap body, the outer bevel of the hook portion slides relative to the inner wall of the injection pen body, thereby squeezing the free end of the wing and bringing it closer to the support column.
3. The syringe assembly of claim 1, wherein, The hook portion is provided with an inner inclined surface; When the pen cap is separated from the injection pen, and the pen cap body is reattached to the injection pen, the inner bevel matches the slot so that the hook portion engages in the slot.
4. The syringe assembly of claim 1, wherein, The injection pen also includes a needle cap located inside the injection pen body, the support column is configured as a hollow structure along the axial direction, and the pen cap further includes: A protrusion is provided on the second end of the support column. The protrusion bends toward the support column. When the pen cap body is placed on the injection pen, the protrusion locks the needle cap. During the process of pulling off the pen cap body, the protrusion drives the needle cap and causes the needle cap to separate from the injection pen body through the opening.
5. The syringe assembly of claim 4, wherein, The number of protrusions is two, and the two protrusions are symmetrically arranged about the axis of the support column.
6. The syringe assembly of claim 4, wherein, The support column, the flying wing, and the protrusion are integrally formed.
7. The syringe assembly of claim 4, wherein, The protrusion is made of an elastic material, and / or the wing is made of an elastic material.
8. The injection assembly according to claim 1, characterized in that, The pen cap further includes: A positioning part protrudes from the outer wall of the support column, and the injection pen body is provided with a positioning groove that matches the positioning part; Specifically, after the pen cap is separated from the injection pen, during the process of reattaching the pen cap body to the injection pen, the positioning part is confined in the positioning groove.
9. The injection assembly according to claim 1, characterized in that, The number of the flying wings is two, and the two flying wings are symmetrically arranged about the axis of the support column.
10. The injection assembly according to claim 1, characterized in that, The injection pen further includes a needle cap located inside the injection pen body, the injection pen body comprising: The shell has an opening; An injection needle, at least partially located inside the housing, the tip of the injection needle extending from the opening to the outside of the housing, and a needle cap covering the tip of the needle; A protective sleeve is located around the injection needle and at least partially inside the housing, wherein the opening is provided on the end face of the protective sleeve.