Injection pen assembly and injection pen
By setting a limiting and locking groove on the injection pen holder, the sliding block slides into the locking groove and is stopped by the locking surface after injection, which solves the problem of secondary contamination and accidental injury caused by the exposed injection pen needle and improves safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU WANHAI MEDICAL INSTR CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-05
AI Technical Summary
After injection, the needle of the vial assembly may be exposed, which could lead to secondary contamination or accidental injury.
A limiting groove is provided on the side wall of the syringe holder, and a sliding block is provided inside the plunger sleeve. After the injection is completed, the sliding block slides into the locking groove and is stopped by the locking surface to prevent the plunger sleeve from sliding again and to avoid the needle tip from being exposed.
It effectively prevents the injection pen needle from being exposed after injection, reducing the risk of secondary contamination and personal injury.
Smart Images
Figure CN224193865U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of injection pen technology, specifically relating to an injection pen component and an injection pen. Background Technology
[0002] An injection pen is a medical device used for subcutaneous or intramuscular injection of drugs. It is designed to improve the convenience, accuracy, and safety of drug injection. When using existing injection pens, the user usually needs to hold the pen body and press it against the skin. The activation sleeve inside the pen body is squeezed into the pen body, which drives the push rod sleeve to slide, activating the activator to complete the injection. However, after the injection is completed, the activation sleeve may be pressed back into the pen body, causing the needle of the vial assembly to be exposed, resulting in secondary contamination or accidental injury to the user.
[0003] Therefore, how to avoid the needle being exposed after injection is a technical problem that urgently needs to be solved in this field.
[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content
[0005] This disclosure provides at least one injection pen assembly and an injection pen.
[0006] In a first aspect, embodiments of this disclosure provide an injection pen assembly, comprising: an end cap; an upper pen body connected to the end cap; a bracket located within the upper pen body, the proximal end of the bracket being connected to the end cap, a limiting groove being formed on the side wall of the bracket, and an activation groove and a locking groove extending from the distal end of the limiting groove; and a push rod sleeve sleeved on the outside of the bracket, the inner wall of the push rod sleeve being provided with a sliding block, the sliding block being engaged in the activation groove before the injection pen is activated; wherein, when the push rod sleeve slides proximally, the sliding block slides from the activation groove into the limiting groove, and the injection pen is activated; after injection, the push rod sleeve slides distally, the sliding block slides from the limiting groove into the locking groove, the end side wall of the locking groove forming a locking surface, and the sliding block and the locking surface stop to lock the push rod sleeve.
[0007] In one alternative embodiment, the locking slide is connected to the distal end of the limiting slide.
[0008] In one optional embodiment, both the limiting slide groove and the activating slide groove are parallel to the axis of the support. The side wall of the limiting slide groove is provided with a connecting groove, and the two ends of the connecting groove are respectively connected to the limiting slide groove and the activating slide groove. The connecting groove is arranged at an angle to the axis of the support. When the sliding block slides along the connecting groove, the push rod sleeve will rotate.
[0009] In one optional embodiment, the angle between the connecting groove and the support axis is 15-25°, and the length of the connecting groove is less than the length of the excitation groove.
[0010] In one alternative embodiment, at least a portion of the locking groove is arranged at an angle relative to the axis of the bracket.
[0011] In one optional embodiment, the distal end of the locking groove is provided with a locking notch, the locking notch is parallel to the axis of the bracket, and the proximal end face of the locking notch is a locking surface.
[0012] In one alternative embodiment, the locking surface is inclined relative to the cross-section of the bracket, and the end of the locking surface near the locking groove is closer to the far end of the bracket.
[0013] In one optional embodiment, the angle between the axis of the locking groove end and the cross section of the bracket is 0-10°.
[0014] In one optional embodiment, the injection pen assembly includes an exciter disposed within a support. The support has a slot at its proximal end, and an exciter block is provided on the side wall of the exciter. The exciter block extends out of the slot from the support. The slot is aligned with a limiting slide groove, and a stop surface is formed at the connection between the slot and the limiting slide groove. Before the injection pen is actuated, the exciter block abuts against the stop surface.
[0015] Secondly, this disclosure also provides an injection pen, including: the above-mentioned injection pen assembly; a lower pen body, in which an activation sleeve and a vial assembly are disposed, wherein the end of the activation sleeve always abuts against the push rod sleeve, and when the activation sleeve pushes the push rod sleeve to slide proximally, the sliding block slides from the activation groove into the limiting groove, and the injection pen is activated; and a pen cap, connected to the distal end of the lower pen body.
[0016] The beneficial effect of this utility model is that the injection pen assembly and injection pen have a limiting slide groove opened on the side wall of the bracket, and an activation slide groove and a locking slide groove extended at the distal end of the limiting slide groove. When the push rod sleeve slides to the proximal end (in this article, the proximal end is the direction of the end cap and the distal end is the direction of the pen cap), the sliding block slides into the limiting slide groove. After the injection is completed, the sliding block slides into the locking slide groove and is stopped by the locking surface in the locking slide groove to prevent the push rod sleeve from sliding to the proximal end again, which would cause the needle to be exposed.
[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.
[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0019] To more clearly illustrate the specific embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0020] Figure 1 A perspective view of an injection pen provided in an embodiment of this disclosure;
[0021] Figure 2 A perspective view of an injection pen provided in an embodiment of this disclosure;
[0022] Figure 3 A schematic diagram of a push rod sleeve and an excitation sleeve in the uninjected state, provided for an embodiment of this disclosure;
[0023] Figure 4 A schematic diagram of a pusher sleeve and an excitation sleeve during the completion of injection, provided in an embodiment of this disclosure;
[0024] Figure 5 A perspective view of a bracket and push rod sleeve provided for an embodiment of this disclosure;
[0025] Figure 6 An exploded view of a bracket and push rod sleeve provided in an embodiment of this disclosure;
[0026] Figure 7 An exploded view of a bracket and push rod sleeve provided in an embodiment of this disclosure;
[0027] Figure 8 A front view of a bracket provided in an embodiment of this disclosure.
[0028] In the picture:
[0029] 1. Bracket; 11. Limiting groove; 11a. Connecting groove; 12. Actuating groove; 13. Locking groove; 14. Locking notch; 14a. Locking surface; 15. Groove opening; 15a. Stop surface;
[0030] 2. Push rod sleeve; 21. Sliding block; 22. Return spring;
[0031] 3. Upper pen body; 31. Actuator; 31a. Actuator block;
[0032] 4. Pen body; 41. Actuating sleeve; 42. Medicine bottle assembly;
[0033] 5. End caps;
[0034] 6. Pen cap. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0036] 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.
[0037] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] Research has revealed that in existing technologies, the needle of the vial assembly is exposed again after injection, leading to secondary contamination and puncture wounds. This is the problem and objective that the utility model aims to solve.
[0042] Based on the above research, this disclosure provides an injection pen assembly and an injection pen. After the push rod sleeve completes the injection, the sliding block slides into the locking groove and is stopped by the locking surface, locking the push rod sleeve.
[0043] The shortcomings of the above solutions are the result of the utility model inventor's practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as contributions made by the utility model inventor to this disclosure.
[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0045] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0046] See Figures 1 to 8 An injection pen assembly is shown, comprising: an end cap 5; an upper pen body 3 connected to the end cap 5; a bracket 1 located inside the upper pen body 3, the proximal end of the bracket 1 connected to the end cap 5, a limiting groove 11 formed on the side wall of the bracket 1, and an activation groove 12 and a locking groove 13 extending distally from the limiting groove 11; and a push rod sleeve 2 sleeved on the outside of the bracket 1, the inner wall of the push rod sleeve 2 having a sliding block 21, which is engaged in the activation groove 12 before the injection pen is activated; wherein, when the push rod sleeve 2 slides proximally, the sliding block 21 slides from the activation groove 12 into the limiting groove 11, and the injection pen is activated; after injection, the push rod sleeve 2 slides distally... The sliding block 21 slides from the limiting groove 11 into the locking groove 13. The end sidewall of the locking groove 13 forms a locking surface 14a. The sliding block 21 and the locking surface 14a stop each other to lock the push rod sleeve 2. In short, the push rod sleeve 2 slides proximally under the drive of the excitation sleeve 41. By opening the limiting groove 11 on the sidewall of the support 1 and extending the excitation groove 12 and the locking groove 13 at the distal end of the limiting groove 11, the sliding block 21 slides into the limiting groove 11 when the push rod sleeve 2 slides proximally. After the injection is completed, the sliding block 21 slides into the locking groove 13 and is stopped by the locking surface 14a in the locking groove 13 to prevent the push rod sleeve 2 from sliding proximally again, which would cause the needle to be exposed.
[0047] In some embodiments, the locking groove 13 is connected to the far end of the limiting groove 11; in short, this design ensures that the sliding block 21 can stably enter the locking groove 13 when it slides out of the limiting groove 11, thus completing the locking of the push rod sleeve 2.
[0048] In some embodiments, both the limiting slide groove 11 and the activating slide groove 12 are parallel to the axis of the bracket 1. The side wall of the limiting slide groove 11 is provided with a connecting groove 11a, the two ends of which are connected to the limiting slide groove 11 and the activating slide groove 12 respectively, and the connecting groove 11a is arranged at an angle to the axis of the bracket 1. When the sliding block 21 slides along the connecting groove 11a, the push rod sleeve 2 will rotate. In short, in order to avoid interference between the activating slide groove 12 and the locking slide groove 13, a connecting groove 11a is provided on the side wall of the limiting slide groove 11 to connect to the activating slide groove 12, so as to ensure that the sliding block 21 can stably enter the limiting slide groove 11, and the push rod sleeve 2 is directly sleeved on the outside of the bracket 1 (that is, the push rod sleeve 2 has circumferential degrees of freedom). When the sliding block 21 slides, the push rod sleeve 2 can rotate with it to avoid interference.
[0049] In some embodiments, the angle between the connecting groove 11a and the axis of the support 1 is 15-25°, and the length of the connecting groove 11a is less than the length of the excitation groove 12. In short, the angle between the connecting groove 11a and the axis of the support 1 is controlled at 15-25° to ensure that the sliding block 21 can slide smoothly into the limiting groove 11, avoiding the push rod sleeve 2 from needing to rotate too much. Furthermore, the connecting groove 11a serves as a transition groove, and its length is less than the length of the excitation groove 12.
[0050] In some embodiments, at least a portion of the locking groove 13 is arranged at an angle relative to the axis of the bracket 1; in short, the front section of the locking groove 13 can be arranged vertically, and its tail end is arranged at an angle to the axis of the bracket 1 to form a locking surface 14a.
[0051] See Figure 7 In some embodiments, the locking groove 13 has a locking notch 14 at its distal end, the locking notch 14 is parallel to the axis of the bracket 1, and the proximal end face of the locking notch 14 is a locking surface 14a; in short, when the sliding block 21 slides into the locking notch 14, the sliding block 21 can be locked by the proximal end face (i.e., the locking surface 14a) of the locking notch 14, preventing the sliding block 21 from sliding out of the locking notch 14.
[0052] See Figure 7 In some embodiments, the locking surface 14a is inclined relative to the cross-section of the bracket 1, and the end of the locking surface 14a near the locking groove 13 is closer to the far end of the bracket 1; in short, the end of the locking surface 14a away from the locking groove 13 is inclined towards the near end to stop the sliding block 21 and prevent the sliding block 21 from sliding out of the locking notch 14.
[0053] See Figure 8 In some embodiments, the angle between the axis of the end of the locking groove 13 and the cross section of the bracket 1 is 0-10°; in short, this design can ensure that the locking surface 14a provides a good stopping effect on the sliding block 21.
[0054] In some embodiments, the injection pen assembly includes an actuating element 31 disposed within a support 1. A slot 15 is provided at the proximal end of the support 1. An actuating block 31a is provided on the sidewall of the actuating element 31, extending from the slot 15 into the support 1. The slot 15 is aligned with a limiting slide groove 11, and a stop surface 15a is formed at the connection between the slot 15 and the limiting slide groove 11. Before the injection pen is actuated, the actuating block 31a abuts against the stop surface 15a. In short, the slot 15 is aligned with the limiting slide groove 11 to facilitate the sliding block 21 sliding into the limiting slide groove 11, improving the ease of installation of the push rod sleeve 2. Furthermore, the stop surface formed at the connection between the slot 15 and the limiting slide groove 11 limits the firing block on the sidewall of the actuating element 31.
[0055] See Figures 1 to 8 The diagram illustrates an injection pen, comprising: the aforementioned injection pen assembly; a lower pen body 4, within which an activation sleeve 41 and a vial assembly 42 are disposed, the end of the activation sleeve 41 always abutting against a push rod sleeve 2; when the activation sleeve 41 pushes the push rod sleeve 2 to slide proximally, the sliding block 21 slides from the activation groove 12 into the limiting groove 11, and the injection pen is activated; a pen cap 6, connected to the distal end of the lower pen body 4; in short, when the injection pen is pressed, the activation sleeve 41 slides into the injection pen, the needle of the vial assembly 42 is exposed, and the push rod sleeve 2 follows by sliding proximally to trigger the activation block 31a to activate the activation element 31 to complete the injection, while the return spring 22 is compressed; after the injection is completed, the activation sleeve 41 returns to its original position under the action of the return spring 22 to cover the needle of the vial assembly 42, while the sliding block 21 slides into the locking notch 14 to lock the push rod sleeve 2.
[0056] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0057] 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 orientation or positional relationships, are based on the orientation or positional relationships 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, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.
[0058] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0059] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.
[0060] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model 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 assembly, characterized in that, include: End cap (5); The upper pen body (3) is connected to the end cap (5); The bracket (1) is located inside the upper pen body (3). The proximal end of the bracket (1) is connected to the end cap (5). The side wall of the bracket (1) is provided with a limiting slide groove (11). The distal end of the limiting slide groove (11) extends to a trigger slide groove (12) and a locking slide groove (13). A push rod sleeve (2) is fitted onto the outside of the bracket (1). A sliding block (21) is provided on the inner wall of the push rod sleeve (2). Before the injection pen is activated, the sliding block (21) is engaged within the activation groove (12). When the push rod sleeve (2) slides to the proximal end, the sliding block (21) slides from the excitation groove (12) into the limiting groove (11), and the injection pen is excited; After injection, the push rod sleeve (2) slides to the distal end, and the sliding block (21) slides from the limiting slide groove (11) into the locking slide groove (13). The end side wall of the locking slide groove (13) forms a locking surface (14a). The sliding block (21) stops with the locking surface (14a) to lock the push rod sleeve (2).
2. The injection pen assembly as claimed in claim 1, characterized in that, The locking groove (13) is connected to the far end of the limiting groove (11).
3. The injection pen assembly as described in claim 2, characterized in that, The limiting slide (11) and the activating slide (12) are both parallel to the axis of the support (1). The side wall of the limiting slide (11) is provided with a connecting groove (11a). The two ends of the connecting groove (11a) are respectively connected to the limiting slide (11) and the activating slide (12), and the connecting groove (11a) is arranged at an angle to the axis of the support (1). When the sliding block (21) slides along the connecting groove (11a), the push rod sleeve (2) will rotate.
4. The injection pen assembly as described in claim 3, characterized in that, The angle between the connecting groove (11a) and the axis of the support (1) is 15-25°, and the length of the connecting groove (11a) is less than the length of the excitation groove (12).
5. The injection pen assembly as claimed in claim 3, characterized in that, At least a portion of the locking groove (13) is set at an angle relative to the axis of the bracket (1).
6. The injection pen assembly as claimed in claim 5, characterized in that, The locking groove (13) has a locking notch (14) at its far end. The locking notch (14) is parallel to the axis of the bracket (1), and the proximal end face of the locking notch (14) is the locking surface (14a).
7. The injection pen assembly as claimed in claim 6, characterized in that, The locking surface (14a) is inclined relative to the cross-section of the bracket (1), and the end of the locking surface (14a) near the locking groove (13) is closer to the far end of the bracket (1).
8. The injection pen assembly as claimed in claim 1, characterized in that, The angle between the axis of the end of the locking groove (13) and the cross section of the bracket (1) is 0-10°.
9. The injection pen assembly as described in any one of claims 1-8, characterized in that, The injection pen assembly includes an exciter (31), which is disposed in a bracket (1). The bracket (1) has a slot (15) at its proximal end. An exciter block (31a) is provided on the side wall of the exciter (31). The exciter block (31a) extends out of the bracket (1) from the slot (15). The slot (15) is aligned with a limiting slide (11). A stop surface (15a) is formed at the connection between the slot (15) and the limiting slide (11). Before the injection pen is actuated, the exciter block (31a) abuts against the stop surface (15a).
10. An injection pen, characterized in that, include: The injection pen assembly as described in any one of claims 1-9; The lower pen body (4) is provided with an activation sleeve (41) and a medicine bottle assembly (42). The end of the activation sleeve (41) always abuts against the push rod sleeve (2). When the activation sleeve (41) pushes the push rod sleeve (2) to slide towards the proximal end, the sliding block (21) slides from the activation groove (12) into the limiting groove (11), and the injection pen is activated. The pen cap (6) is attached to the far end of the lower pen body (4).