Locking mechanism and injection pen

Abstract

This utility model belongs to the field of injection pen technology, specifically relating to a locking mechanism, including: a sliding sleeve, which is slidably disposed within the upper pen body and abuts against an excitation component, so as to slide with the excitation component to the rear end to excite the injection pen for injection; and a limiting buckle that always extends into the sliding sleeve, the inner wall of the sliding sleeve being provided with a locking notch, and a rotating component being provided between two adjacent ends of the sliding sleeve and the fixed sleeve, the rotating component being adapted to guide the sliding sleeve to rotate when the sliding sleeve approaches the fixed sleeve, so that the locking notch is aligned with the limiting buckle; wherein, when the sliding sleeve returns to its original position following the excitation component, the limiting buckle slides into the locking notch, and at the same time, the limiting buckle abuts against the locking notch, so that the sliding sleeve cannot slide to the rear end again; by means of the rotating component, the sliding sleeve rotates when sliding with the excitation component, the locking notch is aligned with the limiting buckle, and after the sliding sleeve returns to its original position, the limiting buckle slides into the locking notch.

Description

Technical Field

[0001] This utility model belongs to the field of injection pen technology, specifically relating to a locking mechanism and an injection pen. Background Technology

[0002] An injection pen (also known as a medication pen) is a portable subcutaneous injection device inspired by a fountain pen, used for patients to self-administer medication. Existing injection pens include a pen body, a vial assembly, and an activation component. The activation component typically includes an activation sleeve and an activation plunger. The sliding of the activation sleeve exposes the needle in the vial assembly, simultaneously triggering the activation plunger, which pushes the rubber stopper of the vial assembly to complete the injection of the medication. However, after the injection is completed, the activation sleeve can still slide, which can easily expose the needle again, leading to secondary contamination.

[0003] Therefore, how to avoid secondary exposure of the needle and subsequent secondary contamination 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 locking mechanism and an injection pen.

[0006] In a first aspect, embodiments of this disclosure provide a locking mechanism, comprising: a fixed sleeve inserted into an upper pen body, the front end of the fixed sleeve being provided with a limiting buckle; a sliding sleeve slidably disposed within the upper pen body and abutting against an excitation component, so as to slide rearward with the excitation component to excite the injection pen for injection; and the limiting buckle always extending into the sliding sleeve, the inner wall of the sliding sleeve being provided with a locking notch, and a rotating component being provided between two adjacent ends of the sliding sleeve and the fixed sleeve, the rotating component being adapted to guide the sliding sleeve to rotate when the sliding sleeve approaches the fixed sleeve, so as to align the locking notch with the limiting buckle; wherein, when the sliding sleeve returns to its original position following the excitation component, the limiting buckle slides into the locking notch, and simultaneously the limiting buckle abuts against the locking notch, so that the sliding sleeve cannot slide rearward again.

[0007] In one optional embodiment, the rotating assembly includes a rotating block disposed at the front end of the fixed sleeve, and the rotating block has an inclined fixed sidewall; the rear end of the sliding sleeve has a rotating notch, and when the sliding sleeve slides to the rear end, the rotating block inserts into the rotating notch, and the fixed sidewall guides the sidewall of the rotating notch, so that the sliding sleeve makes a spiral motion, so that the sliding sleeve rotates until the locking notch aligns with the limiting buckle.

[0008] In one alternative embodiment, one of the sidewalls of the rotating notch is angled to form a sliding sidewall, the head of the fixed sidewall being aligned with the rear end of the sliding sidewall, the sliding sidewall being adapted to fit against the fixed sidewall.

[0009] In one alternative embodiment, the head of the rotating block and the rear end of the sliding sidewall are both provided with rounded corners.

[0010] In one alternative embodiment, the bottom wall of the locking notch is inclined to prevent the limiting buckle from sliding out.

[0011] In one alternative embodiment, the end of the limiting buckle is inclined and adapted to fit against the bottom wall of the locking notch.

[0012] In one optional embodiment, the inner wall of the sliding sleeve is provided with a limiting groove, the width of which is adapted to the width of the limiting buckle.

[0013] In one alternative embodiment, the initial position of the limiting buckle (11) in the limiting groove (23) and the locking position in the locking notch (21) partially coincide.

[0014] In one optional embodiment, the inner wall of the sliding sleeve is provided with a thickened ring, and the limiting groove is formed on the thickened ring; the locking notch passes through the thickened ring; and the front end of the fixed sleeve is provided with an elastic strip, and the limiting buckle is provided at the end of the elastic strip; wherein, when the limiting buckle slides toward the locking notch, the limiting buckle is squeezed by the thickened ring, causing the elastic strip to bend inward, so as to avoid the elastic buckle breaking.

[0015] Secondly, this disclosure also provides an injection pen, comprising: an upper pen body with an end cap inserted at its rear end; a lower pen body inserted at its front end; the aforementioned locking mechanism, wherein the fixing sleeve is detachably connected to the end cap, and the sliding sleeve is slidably disposed within the upper pen body; a vial assembly inserted within the lower pen body; and an activation assembly including an activation sleeve slidably disposed within the lower pen body, the activation sleeve always abutting against the sliding sleeve; wherein, in its initial state, the activation sleeve covers the needle of the vial assembly.

[0016] The beneficial effect of this utility model is that the locking mechanism and injection pen are provided with a rotating component at the opposite ends of the sliding sleeve and the fixed sleeve, so that the sliding sleeve rotates when it slides with the excitation component, so that the locking notch is aligned with the limiting buckle, and after the sliding sleeve is reset, the limiting buckle slides into the locking notch, so as to prevent the sliding sleeve from sliding to the rear end (i.e., the direction closer to the end cap, and the front end is the direction closer to the needle) again, thus preventing the needle from being exposed again.

[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 cross-sectional view of an injection pen provided in an embodiment of this disclosure;

[0022] Figure 3 A cross-sectional view of a sliding sleeve in its initial position, provided in an embodiment of this disclosure;

[0023] Figure 4 A cross-sectional view of a sliding sleeve following an excitation assembly as it moves toward the rear end to the endpoint, provided in an embodiment of this disclosure;

[0024] Figure 5 A cross-sectional view of a sliding sleeve after reset, provided in an embodiment of this disclosure;

[0025] Figure 6 A perspective view of a fixed sleeve and a sliding sleeve provided in an embodiment of this disclosure;

[0026] Figure 7 A cross-sectional view of a sliding sleeve locked after being reset, provided in an embodiment of this disclosure;

[0027] Figure 8 A cross-sectional view of a fixed sleeve and a sliding sleeve provided in an embodiment of this disclosure.

[0028] In the picture:

[0029] 1. Fixing sleeve; 11. Limiting buckle; 12. Elastic strip;

[0030] 2. Sliding sleeve; 21. Locking notch; 22. Rotation notch; 22a. Sliding sidewall; 23. Limiting groove; 24. Thickened ring;

[0031] 3. Rotating assembly; 31. Rotating block; 31a. Fixed sidewall;

[0032] 4. Upper part of the pen body; 41. End cap;

[0033] 5. The beginning of the stroke;

[0034] 6. Medicine bottle assembly;

[0035] 7. Excitation assembly; 71. Excitation sleeve. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Research has revealed that in existing injection pens, the needle may become exposed again after injection, leading to secondary contamination. This is the problem and objective that the utility model aims to solve.

[0041] Based on the above research, this disclosure provides a locking mechanism and an injection pen. By setting a locking notch on the sliding sleeve and cooperating with the limiting buckle on the fixed sleeve, after the injection pen is injected, the limiting buckle abuts against the locking notch to prevent the sliding sleeve from sliding backward, thereby locking the activation sleeve and preventing the needle from being exposed again.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] See Figures 1 to 8A locking mechanism is shown, comprising: a fixed sleeve 1 inserted into an upper pen body 4, the front end of the fixed sleeve 1 having a limiting buckle 11; a sliding sleeve 2 slidably disposed within the upper pen body 4 and abutting against an actuation component 7, so as to slide with the actuation component 7 to the rear end to actuate the injection pen; and the limiting buckle 11 always extending into the sliding sleeve 2, the inner wall of the sliding sleeve 2 having a locking notch 21, and a rotating component 3 disposed between two adjacent ends of the sliding sleeve 2 and the fixed sleeve 1, the rotating component 3 being adapted to guide the sliding sleeve 2 to rotate when the sliding sleeve 2 approaches the fixed sleeve 1, so as to actuate the locking notch. 21 is aligned with the limiting buckle 11; wherein, when the sliding sleeve 2 follows the excitation component 7 to reset, the limiting buckle 11 slides into the locking notch 21, and at the same time, the limiting buckle 11 abuts against the locking notch 21, so that the sliding sleeve 2 cannot slide to the rear end again; in short, by setting the rotating component 3 at the opposite ends of the sliding sleeve 2 and the fixed sleeve 1, the sliding sleeve 2 rotates when it slides with the excitation component 7, so that the locking notch 21 is aligned with the limiting buckle 11, and after the sliding sleeve 2 is reset, the limiting buckle 11 slides into the locking notch 21, so as to prevent the sliding sleeve 2 from sliding to the rear end again and to prevent the needle from being exposed again.

[0046] In one optional embodiment, the rotating assembly 3 includes a rotating block 31, which is disposed at the front end of the fixed sleeve 1 and has an inclined fixed sidewall 31a. The rear end of the sliding sleeve 2 has a rotating notch 22. When the sliding sleeve 2 slides to the rear end, the rotating block 31 inserts into the rotating notch 22, and the fixed sidewall 31a guides the sidewall of the rotating notch 22, causing the sliding sleeve 2 to make a spiral motion, so that the sliding sleeve 2 rotates until the locking notch 21 is aligned with the limiting buckle 11. In short, the rotating block 31 is adapted to slide into the rotating notch 22 when the sliding sleeve 2 slides to the rear end (close to the fixed sleeve 1), and the sidewall of the rotating block 31 is inclined (i.e., the fixed sidewall 31a) so that the rotating notch 22 is guided to rotate by the fixed sidewall 31a, so that the locking notch 21 is aligned with the limiting buckle 11.

[0047] In one alternative embodiment, one sidewall of the rotating notch 22 is inclined to form a sliding sidewall 22a, the head of the fixed sidewall 31a is aligned with the rear end of the sliding sidewall 22a, and the sliding sidewall 22a is adapted to fit against the fixed sidewall 31a; in short, in order to ensure smooth rotation of the sliding sleeve 2, the sidewall of the rotating notch 22 is inclined (i.e., the sliding sidewall 22a) and the inclination angle is adapted to the fixed sidewall 31a, so that the sliding sidewall 22a drives the sliding sleeve 2 to rotate under the guidance of the fixed sidewall 31a.

[0048] In one optional embodiment, the head of the rotating block 31 and the rear end of the sliding sidewall 22a are both provided with rounded corners; in short, rounded corners are provided on the edges of the rotating block 31 and the rotating notch 22 so that when the rotating block 31 contacts the rotating notch 22, there is a rounded corner for transition, so as to prevent the rotating block 31 from being directly hit by the sliding sleeve 2, which would cause damage to the rotating block 31.

[0049] See Figure 7 In one optional embodiment, the bottom wall of the locking notch 21 is inclined to prevent the limiting buckle 11 from sliding out; in short, the bottom wall of the locking notch 21 is inclined, and the side of it closer to the axis of the sliding sleeve 2 is higher to prevent the limiting buckle 11 from sliding out.

[0050] See Figure 7 In one optional embodiment, the end of the limiting buckle 11 is inclined and adapted to fit against the bottom wall of the locking notch 21; in short, the end of the limiting buckle 11 is also inclined and adapted to fit against the bottom wall of the locking notch 21, further preventing the limiting buckle 11 from slipping out.

[0051] In one optional embodiment, the inner wall of the sliding sleeve 2 is provided with a limiting groove 23, the width of which is adapted to the width of the limiting buckle 11. In short, the sliding sleeve 2 can only slide along the direction of the limiting groove 23 when sliding, ensuring that the rotating block 31 and the rotating notch 22 are always aligned. Furthermore, by adjusting the length of the limiting groove 23, the limiting buckle 11 can just slide out of the limiting groove 23 when the rotating block 31 contacts the rotating notch 22, thus ensuring that the sliding sleeve 2 can rotate smoothly.

[0052] See Figure 8 In one optional embodiment, the initial position of the limiting buckle 11 (11) in the limiting groove 23 (23) and the locking position in the locking notch 21 (21) partially coincide; in short, since the angle of the fixed sidewall 31a will affect the rotation angle of the sliding sleeve 2, when the rotation angle of the sliding sleeve 2 is small, the limiting groove 23 and the locking groove share a part of the space, so as to achieve the purpose of reasonable layout.

[0053] In one optional embodiment, the inner wall of the sliding sleeve 2 is provided with a thickened ring 24, and the limiting groove 23 is formed on the thickened ring 24; the locking notch 21 passes through the thickened ring 24; and the front end of the fixed sleeve 1 is provided with an elastic strip 12, and the limiting buckle 11 is provided at the end of the elastic strip 12; wherein, when the limiting buckle 11 slides toward the locking notch 21, the limiting buckle 11 is squeezed by the thickened ring 24, causing the elastic strip 12 to bend inward, so as to avoid the elastic buckle breaking; in short, the inner wall of the sliding sleeve 2 is provided with a thickened ring 24 to improve the strength of the sliding sleeve 2, and the limiting groove 23 is formed on the thickened ring 24; at the same time, the limiting buckle 11 is connected to the fixed sleeve 1 through the elastic strip 12, so that the limiting buckle 11 will not be damaged when it passes through the thickened ring 24 (i.e., during the process of sliding into the locking notch 21).

[0054] See Figure 1-8 An injection pen is shown, comprising: an upper pen body 4, with an end cap 41 inserted at the rear end of the upper pen body 4; a lower pen body 5, inserted at the front end of the upper pen body 4; a locking mechanism, wherein a fixing sleeve 1 is detachably connected to the end cap 41, and a sliding sleeve 2 is slidably disposed within the upper pen body 4; a vial assembly 6, inserted within the lower pen body 5; and an activation assembly 7, including an activation sleeve 71, which is slidably disposed within the lower pen body 5 and always abuts against the sliding sleeve 2; wherein, in the initial state, the activation sleeve 71 covers the needle of the vial assembly 6; in short, the activation sleeve 71 slides rearward to expose the needle for injection, and after injection, the activation sleeve 71 returns to its original position to cover the needle, and the sliding sleeve 2 is locked by the fixing sleeve 1 to prevent secondary exposure of the needle.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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. A locking mechanism, characterized in that, include: A fixing sleeve (1) is inserted into the upper pen body (4), and a limit buckle (11) is provided at the front end of the fixing sleeve (1). The sliding sleeve (2), which is slidably disposed within the upper pen body (4) and abuts against the excitation component (7), slides rearward following the excitation component (7) to excite the injection pen to inject; and, The limiting buckle (11) always extends into the sliding sleeve (2). The inner wall of the sliding sleeve (2) is provided with a locking notch (21). A rotating assembly (3) is provided between two adjacent ends of the sliding sleeve (2) and the fixed sleeve (1). The rotating assembly (3) is adapted to guide the sliding sleeve (2) to rotate when the sliding sleeve (2) approaches the fixed sleeve (1), so that the locking notch (21) is aligned with the limiting buckle (11). When the sliding sleeve (2) returns to its original position following the excitation component (7), the limiting buckle (11) slides into the locking notch (21), and at the same time the limiting buckle (11) abuts against the locking notch (21) so that the sliding sleeve (2) cannot slide to the rear end again.

2. The locking mechanism as described in claim 1, characterized in that, The rotating assembly (3) includes a rotating block (31), which is disposed at the front end of the fixed sleeve (1) and has an inclined fixed sidewall (31a). The sliding sleeve (2) has a rotating notch (22) at its rear end. When the sliding sleeve (2) slides to the rear end, the rotating block (31) inserts into the rotating notch (22), and the fixed sidewall (31a) guides the sidewall of the rotating notch (22), so that the sliding sleeve (2) makes a spiral motion, so that the sliding sleeve (2) rotates until the locking notch (21) is aligned with the limiting buckle (11).

3. The locking mechanism as described in claim 2, characterized in that, One of the sidewalls of the rotating notch (22) is inclined to form a sliding sidewall (22a), the head of the fixed sidewall (31a) is aligned with the rear end of the sliding sidewall (22a), and the sliding sidewall (22a) is adapted to fit against the fixed sidewall (31a).

4. The locking mechanism as described in claim 2, characterized in that, The head of the rotating block (31) and the rear end of the sliding sidewall (22a) are both provided with rounded corners.

5. The locking mechanism as described in claim 1, characterized in that, The bottom wall of the locking notch (21) is inclined to prevent the limiting buckle (11) from sliding out.

6. The locking mechanism as described in claim 5, characterized in that, The end of the limiting buckle (11) is inclined and is adapted to fit against the bottom wall of the locking notch (21).

7. The locking mechanism as described in claim 1, characterized in that, The inner wall of the sliding sleeve (2) is provided with a limiting groove (23), and the width of the limiting groove (23) is adapted to the width of the limiting buckle (11).

8. The locking mechanism as described in claim 7, characterized in that, The initial position of the limiting buckle (11) in the limiting groove (23) and the locking position in the locking notch (21) partially coincide.

9. The locking mechanism as described in claim 7, characterized in that, The inner wall of the sliding sleeve (2) is provided with a thickened ring (24), and the limiting groove (23) is formed on the thickened ring (24); The locking notch (21) penetrates the thickened ring (24); and, The front end of the fixed sleeve (1) is provided with an elastic strip (12), and the limiting buckle (11) is provided at the end of the elastic strip (12); wherein, When the limiting buckle (11) slides toward the locking notch (21), the limiting buckle (11) is squeezed by the thickened ring (24), causing the elastic strip (12) to bend inward to prevent the elastic buckle from breaking.

10. An injection pen, characterized in that, include: The upper pen body (4) has an end cap (41) inserted at its rear end. The lower pen body (5) is inserted into the front end of the upper pen body (4); The locking mechanism as described in any one of claims 1-9, wherein the fixed sleeve (1) is detachably connected to the end cap (41), and the sliding sleeve (2) is slidably disposed within the upper pen body (4); The medicine bottle assembly (6) is inserted into the lower pen body (5); The excitation assembly (7) includes an excitation sleeve (71) slidably disposed within the lower pen body (5), and the excitation sleeve (71) always abuts against the sliding sleeve (2); wherein, In its initial state, the excitation sleeve (71) covers the needle of the vial assembly (6).

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