Injection pen
By incorporating a locking component into the injection pen, the problem of accidental activation of the pen is solved, resulting in improved safety and a better user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-03-27
AI Technical Summary
The lack of insurance coverage for existing injection pens makes them prone to accidental activation due to collisions or children's operation, resulting in drug waste and safety risks.
A locking component is incorporated into the injection pen to lock the slide in the first position. The injection pen can only be activated after the locking component is rotated to unlock it, thus preventing accidental activation.
It improves the safety of the injection pen, prevents accidental activation, reduces drug waste, and enhances the user experience.
Smart Images
Figure CN121731603A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of medical device technology, specifically relating to an injection pen. Background Technology
[0002] An automated injection pen is a medical device used to assist in drug injection. It is easy to operate; simply remove the cap and press the needle end against the skin to activate the injection. However, this convenience also brings some problems, such as accidental activation. Due to the lack of insurance coverage, the cap can easily detach during transportation and storage, leading to accidental activation and wasting the medication stored inside. Furthermore, if a child comes into contact with the pen, it could be activated through simple operation, posing a potential safety risk. Summary of the Invention
[0003] This invention provides an injection pen, including a pen body and a sliding sleeve disposed within the pen body, having a first position and a second position relative to the pen body; an injection pusher located within the sliding sleeve, wherein in the first position, the sliding sleeve holds the injection pusher in a ready-to-release state, and in the second position, the sliding sleeve releases the injection pusher; and a locking component that locks the sliding sleeve in the first position. By rotating the locking component to a certain angle, the locking component releases the locking of the sliding sleeve, allowing the sliding sleeve to be moved to the second position.
[0004] As an optional implementation, the locking component includes a rotating part and a locking part. The rotating part is located on the outside of the pen body, and the locking part is located on the inside of the pen body. The locking part and the sliding sleeve stop on the axial direction of the injection pen to lock the sliding sleeve in the first position. Rotating the rotating part rotates the locking part, causing the locking part to disengage from the sliding sleeve to unlock.
[0005] As an optional implementation, the locking part includes a locking boss, and the outer wall of the sliding sleeve is provided with a stop boss, the locking boss and the stop boss providing axial support in the injection pen.
[0006] As an optional implementation, the rotating part includes a rotating ring and an inner liner, the rotating ring driving the inner liner to rotate, and the locking boss being disposed on the inner wall of the inner liner and extending to the inner side of the pen body.
[0007] As an optional implementation, the pen body is provided with a first through groove, the locking boss extends through the first through groove to the inner side of the pen body and can rotate circumferentially along the first through groove, and a first stop protrusion is provided on one side wall of the first through groove in the axial direction. When the rotating ring is rotated to unlock, the locking boss is driven past the first stop protrusion and disengages from the stop boss.
[0008] As an optional implementation, the inner wall of the liner is provided with a first anti-detachment protrusion, which extends to the inner side of the pen body and stops against the inner wall of the pen body. The first anti-detachment protrusion is located on one side of the axial direction of the locking protrusion.
[0009] As an optional implementation, the first anti-detachment protrusion extends through the first through groove to the inner side of the pen body, and a second stop protrusion is provided on the other side wall of the first through groove along the axial direction. When the rotating ring is rotated to unlock, the first anti-detachment protrusion passes over the second stop protrusion.
[0010] As an optional implementation, the inner wall of the liner is provided with a second anti-detachment protrusion, which extends to the inner side of the pen body and stops against the inner wall of the pen body. The second anti-detachment protrusion is located on the other side of the locking protrusion axially.
[0011] As an optional implementation, the pen body is provided with a second through groove, and the second anti-detachment protrusion extends through the second through groove to the inner side of the pen body, forming an elastic partition between the first through groove and the second through groove.
[0012] As an optional implementation, the inner wall of the rotating ring is provided with partition ribs, and the liner includes two independent arc-shaped plates, each of which is engaged between two adjacent partition ribs, and each of the arc-shaped plates is provided with a locking boss.
[0013] According to the present invention, a locking component is provided to lock the slide in a first position. When injection is required, the locking component must be rotated to unlock it before the injection pen can be activated, thus preventing accidental activation of the injection pen, ensuring safety, and improving the user experience.
[0014] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.
[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0017] Figure 1 A perspective view of an injection pen provided in an embodiment of this disclosure;
[0018] Figure 2 for Figure 1 A cross-sectional view of the middle sliding sleeve in the first position (AA section).
[0019] Figure 3 for Figure 1 A front view of the injection pen after removing part of the structure;
[0020] Figure 4 for Figure 3 Middle BB section view;
[0021] Figure 5 for Figure 4 Enlarged view at point C;
[0022] Figure 6 To lock the exploded view of the component;
[0023] Figure 7 This is a three-dimensional view of the sliding sleeve;
[0024] Figure 8 for Figure 3 Side view;
[0025] Figure 9 for Figure 8 DD cross-sectional view after the hidden part of the structure;
[0026] Figure 10 A three-dimensional view of the lining;
[0027] Figure 11 A three-dimensional drawing of the pen body;
[0028] Figure 12 for Figure 1 AA section view of the middle sliding sleeve in the second position. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0030] like Figure 1 and Figure 2 As shown, an injection pen is provided. The injection pen includes a pen body 10, a locking component 16, a sliding sleeve 11, an excitation sleeve 17, and a pen cap 18. The excitation sleeve 17 and the sliding sleeve 11 are both located inside the pen body 10. The end arm 112 of the excitation sleeve 17 and the sliding sleeve 11 are adjacent to each other in the axial direction. The locking component 16 is rotatable relative to the pen body 10. Figure 3 for Figure 1 Front view after the injection pen has removed the relevant components. Figure 4 for Figure 3 Sectional view of BB (British Block). See also Figure 4 The injection pen also includes a retainer 12, an injection plunger 13, and an activation spring 14, all of which are located within the pen body 10. The activation spring 14 is located within the injection plunger 13, the injection plunger 13 is located within the retainer 12, and the retainer 12 is located within the sliding sleeve 11. In the delivered state, the sliding sleeve 11 is in the first position, as shown below. Figure 2 As shown, at this time, the spring arm of the fixing bracket 12 is locked in the groove on the outer periphery of the injection push rod 13, and the spring arm of the fixing bracket 12 is limited in the inner cavity of the sliding sleeve 11, unable to open outward, thus keeping the injection push rod 13 in the ready-to-activate state; the locking component 16 locks the sliding sleeve 11 in the first position, that is, the sliding sleeve 11 cannot move to the second position, to avoid accidental activation of the injection pen, wherein the first position is the position close to the distal end of the injection pen, and the second position is the position far away from the distal end of the injection pen. When injection is needed, rotating the locking component 16 to a certain angle will release the locking component 16 from locking the sliding sleeve 11. After removing the pen cap 18, the injection pen is pressed on the skin. The activation sleeve 17 moves towards the proximal end of the injection pen after being subjected to skin pressure, and the needle is exposed. At the same time, the activation sleeve 17 moves the sliding sleeve 11 to the second position by pushing the end arm 112, as shown. Figure 12 As shown, at this time, the spring arm of the fixing bracket 12 disengages from the inner cavity of the sliding sleeve 11 and opens outward, allowing the injection push rod 13 to be released instantly to begin injecting the liquid. It should be noted that during injection, the pen cap can be removed first, and then the locking component 16 can be rotated to unlock it; there is no specific order between the two actions.
[0031] It should be noted that, in this application, "distal end" refers to the end of the injection pen connected to the needle, and "proximal end" refers to the end away from the injection pen needle. "Distal end" and "proximal end" are only used to illustrate the technical solution of this application and do not constitute a limitation on the scope of protection of this application.
[0032] Specifically, see Figure 4 The locking assembly 16 includes a rotating part 161 and a locking part. The locking part and the sliding sleeve 11 stop axially in the pen body. Since the locking part and the sliding sleeve 11 stop axially in the pen body to prevent the sliding sleeve 11 from moving toward the second position, the sliding sleeve 11 is locked in the first position. The rotating part 161 is located on the outside of the pen body 10, and the locking part is located on the inside of the pen body. The rotating part 161 is connected to the locking part. Rotating the rotating part 161 will cause the locking part to rotate. That is, rotating the rotating part 161 will cause the locking part to rotate a certain angle to disengage from the axial stop of the sliding sleeve 11.
[0033] As an optional implementation method, such as Figure 4 and Figure 5 As shown, the locking part includes a locking boss 162, and a stop boss 111 is provided on the outer wall of the sliding sleeve 11. The locking boss 162 is located on the side of the stop boss 111 facing the proximal end of the injection pen. When the sliding sleeve 11 is in the second position, that is, when the proximal end of the injection pen is pushed, it is stopped by the locking boss 162 and cannot be pushed. That is, the locking boss 162 and the stop boss 111 stop the sliding sleeve in the axial direction of the injection pen to lock it in the first position, and the injection pen cannot be activated. In addition, the locking boss can also be replaced by a locking post, locking plate, etc., as long as it can achieve the effect of stopping the sliding sleeve 11.
[0034] Compared to traditional injection pens, this invention uses a locking component 16 on the injection pen to lock the first position of the sliding sleeve 11. Even if the pen cap is removed and the pen is pressed against the skin, the sliding sleeve 11 cannot move towards the proximal end of the injection pen because it is stopped by the locking component. Therefore, the excitation sleeve 17 cannot be pushed towards the proximal end of the injection pen, the needle cannot be exposed, and the injection plunger 13 cannot be released. Thus, the injection pen cannot be activated, improving safety performance.
[0035] like Figure 5 and Figure 6As shown, the rotating part includes a rotating ring 1611 and an inner liner 1612. A locking boss 162 is disposed on the inner liner 1612. A partition rib 1613 is provided on the inner wall of the rotating ring 1611. The inner liner 1612 is engaged between two adjacent partition ribs 1613. With this arrangement, when the rotating ring 1611 rotates, it can drive the inner liner 1612 to rotate together, thereby driving the locking boss 162 to rotate. Since the rotating ring 1611 is annular, if the locking boss 162 is directly disposed on the inner wall of the rotating ring 1611, it would be difficult to fit the rotating ring 1611 onto the pen body 10. By providing the inner liner 1612, the inner liner 1612 can be assembled onto the pen body 10 first, and then the rotating ring 1611 can be fitted onto the outer circumference of the inner liner 1612 along the pen body axis. As an optional implementation, the liner 1612 includes two independent arc-shaped plates, each with a locking boss 162. The sliding sleeve 11 has two stop bosses 111, with each locking boss 162 stopping against the corresponding stop boss 111. The inner wall of the rotating ring 1611 has two partition ribs 1613, which divide the inner wall of the rotating ring 1611 into two arc-shaped grooves, with each arc-shaped plate corresponding to one arc-shaped groove. Furthermore, to reduce the number of parts and facilitate assembly, the locking boss 162 can be integrally formed on the inner wall of the liner 1612.
[0036] Figure 8 for Figure 3 Side view of the structure of the injection pen. Figure 9 for Figure 8 The CC cross-sectional view is shown to clearly illustrate the mating relationship between the locking component 16 and the pen body 10. Figure 9 Other structural components were removed. For example... Figure 9 As shown, to facilitate locking the boss 162 and the stop boss 111, a first through groove 101 is provided on the pen body 10. The locking boss 162 extends through the first through groove 101 to the inner side of the pen body 10 and stops with the stop boss 111. The first through groove 101 extends circumferentially along the pen body 10. When the rotating ring 1611 is rotated, the locking boss 162 is driven to rotate circumferentially along the first through groove 101 to disengage from the stop boss 111. A first stop protrusion 102 is provided on one side wall of the first through groove 101 in the axial direction. When the rotating ring 1611 is rotated to unlock, the locking boss 162 rotates with the rotating ring 1611. After the locking boss 162 passes the first stop protrusion 102, it disengages from the stop boss 111. By setting the first stop protrusion 102, on the one hand, the locking protrusion 162 will emit a "click" sound when it crosses the first stop protrusion 102, indicating that the user has successfully unlocked. On the other hand, the first stop protrusion 102 also has a stopping effect on the circumferential rotation of the locking protrusion 162, so that the locking protrusion 162 cannot be easily rotated.
[0037] like Figure 9 and Figure 11As shown, the pen body 10 is provided with a second through groove 104, which is axially aligned with the first through groove 101. An elastic partition 105 is formed between the first through groove 101 and the second through groove 104. Through the elastic partition 105, when the rotating ring 1611 is unlocked, the locking boss 162 rotates along with it, and at the same time, it squeezes the elastic partition 105 to deform toward the distal end of the injection pen. The locking boss 162 can smoothly pass over the first stop protrusion 102 to complete the unlocking, avoiding unlocking failure or unlocking jamming.
[0038] To prevent the inner liner 1612 from detaching from the pen body 10 during installation, such as... Figure 9 As shown, a first anti-detachment protrusion 163 is provided on the inner lining 1612. The first anti-detachment protrusion 163 is disposed on the inner wall of the inner lining 1612. As an optional embodiment, the first anti-detachment protrusion 163 can be integrally formed on the inner wall of the inner lining 1612. A first hook platform 1631 is provided at the end of the first anti-detachment protrusion 163. The first anti-detachment protrusion 163 extends through the first through groove 101 to the inner side of the pen body 10. The first hook platform 1631 stops against the inner wall of the pen body 10, preventing the inner lining 1612 from detaching from the pen body 10. The first anti-detachment protrusion 163 is located on one axial side of the locking protrusion 162. Figure 9 As shown, a second stop protrusion 103 is provided on the other side wall of the first through groove 101 along the axial direction. When the rotating ring 1611 is unlocked, the first anti-detachment protrusion 163 is driven to rotate, and the first anti-detachment protrusion 163 passes the second stop protrusion 103 and emits a "click" sound to indicate that the user has successfully unlocked. At the same time, the second stop protrusion 103 also stops the circumferential rotation of the first anti-detachment protrusion 163, so that the first anti-detachment protrusion 163 is not easily rotated, and the locking protrusion 162 is not easily rotated. The second stop protrusion 103 and the first stop protrusion 102 provide double safety protection and double sound effect prompts.
[0039] like Figure 10 As shown, to further enhance the anti-detachment effect of the inner liner 1612 relative to the pen body 10, a second anti-detachment protrusion 164 is also provided on the inner liner 1612. The second anti-detachment protrusion 164 can be integrally formed on the inner wall of the inner liner 1612. A second hook platform 1641 is provided at the end of the second anti-detachment protrusion 164. The second anti-detachment protrusion 164 extends through the second through groove 104 to the inner side of the pen body 10. The second hook platform 1641 stops against the inner wall of the pen body 10 to prevent the inner liner 1612 from falling off the pen body 10. The second anti-detachment protrusion 164 is located on the other side of the locking protrusion 162 axially.
[0040] In summary, by setting the locking component 16 on the injection pen, the first position of the slide sleeve 11 in the ready-to-activate state is locked, preventing the injection pen from being accidentally activated and improving safety performance.
[0041] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.
[0042] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0043] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0044] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0045] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. An injection pen, comprising a pen body, characterized in that, Also includes: A sliding sleeve is disposed inside the pen body and has a first position and a second position relative to the pen body; An injection push rod is located inside the sliding sleeve. When the sliding sleeve is in the first position, the sliding sleeve holds the injection push rod in a ready-to-release state. When the sliding sleeve is in the second position, the sliding sleeve releases the injection push rod; A locking assembly locks the slide in a first position. Rotating the locking assembly to a certain angle releases the locking assembly from the slide, allowing the slide to be moved to a second position to release the injection push rod.
2. The injection pen according to claim 1, characterized in that, The locking assembly includes a rotating part and a locking part; the rotating part is located on the outside of the pen body, and the locking part is located on the inside of the pen body. The locking part and the sliding sleeve stop the pen shaft upward to lock the sliding sleeve in the first position. Rotating the rotating part rotates the locking part, causing the locking part to disengage from the sliding sleeve to unlock.
3. The injection pen according to claim 2, characterized in that, The locking part includes a locking boss, and the outer wall of the sliding sleeve is provided with a stop boss. The locking boss and the stop boss stop the injection pen axis upward.
4. The injection pen according to claim 3, characterized in that, The rotating part includes a rotating ring and an inner liner. The rotating ring drives the inner liner to rotate. The locking boss is disposed on the inner wall of the inner liner and extends to the inner side of the pen body.
5. The injection pen according to claim 4, characterized in that, The pen body is provided with a first through groove, and the locking boss extends through the first through groove to the inner side of the pen body and can rotate circumferentially along the first through groove. A first stop protrusion is provided on one side wall of the first through groove in the axial direction. When the rotating ring is rotated to unlock, the locking boss is driven past the first stop protrusion and disengages from the stop boss.
6. The injection pen according to claim 5, characterized in that, The inner wall of the liner is provided with a first anti-detachment protrusion. The first anti-detachment protrusion extends to the inner side of the pen body and stops against the inner wall of the pen body. The first anti-detachment protrusion is located on one side of the axial direction of the locking protrusion.
7. The injection pen according to claim 6, characterized in that, The first anti-detachment protrusion extends through the first through groove to the inner side of the pen body. The other side wall of the first through groove is provided with a second stop protrusion. When the rotating ring is rotated to unlock, the first anti-detachment protrusion passes over the second stop protrusion.
8. The injection pen according to claim 6, characterized in that, The inner wall of the liner is provided with a second anti-detachment protrusion. The second anti-detachment protrusion extends to the inner side of the pen body and stops against the inner wall of the pen body. The second anti-detachment protrusion is located on the other side of the locking protrusion axially.
9. The injection pen according to claim 8, characterized in that, The pen body is provided with a second through groove, and the second anti-detachment protrusion extends through the second through groove to the inner side of the pen body, forming an elastic partition between the first through groove and the second through groove.
10. The injection pen according to any one of claims 5-9, characterized in that, The inner wall of the rotating ring is provided with partition ribs, and the lining includes two independent arc-shaped plates. Each arc-shaped plate is engaged between two adjacent partition ribs, and each arc-shaped plate is provided with a locking boss.