Needle protection mechanism and injection pen

Abstract

The utility model belongs to injection pen technical field, concretely relates to a needle protection mechanism and injection pen, include: the needle cover is covered in the medicine bottle subassembly, and the lateral wall of needle cover is provided with the clamping piece, the limiting ring is covered in the needle cover, and the lateral wall of limiting ring is provided with the clamping interface, and the outer wall of limiting ring is provided with the limiting buckle, wherein, when the needle cover slides upward, the injection needle of medicine bottle subassembly exposes, and the clamping piece slides into the clamping interface, when the needle cover resets downward, the injection needle of medicine bottle subassembly hides, and the needle cover drives the limiting ring to slide down to the limiting buckle and slides out the pen body, and the limiting buckle stops at the end face of pen body, through setting the clamping piece in the lateral wall of needle cover, when the needle cover retracts, the clamping piece slides into the clamping interface to buckle the clamping piece, when the needle cover resets, drive the limiting ring to slide down to make the limiting buckle buckle the end face of pen body, to avoid the needle cover to retract again, avoid the occurrence of secondary pollution.

Description

Technical Field

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

[0002] An injection pen is a medical device used for subcutaneous drug injection. The design of injection pens aims to improve the convenience of drug use and patient compliance, while reducing the fear and discomfort of self-injection. Existing injection pens typically consist of a pen body, a concealed needle sleeve, and a vial assembly. During use, pressing the pen body retracts the concealed needle sleeve to expose the injection needle, allowing for skin puncture and injection. However, after injection, pressing the pen body again or accidentally touching the pen body can still expose the injection needle, easily leading to secondary contamination.

[0003] Therefore, how to avoid secondary contamination that may occur 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 needle protection mechanism and an injection pen.

[0006] In a first aspect, embodiments of this disclosure provide a needle protection mechanism, comprising: a concealed needle sleeve fitted onto a vial assembly, the concealed needle sleeve having a snap-fit ​​block on its side wall; and a limiting ring fitted onto the concealed needle sleeve, the limiting ring having a snap-fit ​​interface on its side wall and a limiting buckle on its outer wall, wherein: when the concealed needle sleeve slides upward, the injection needle of the vial assembly is exposed, and the snap-fit ​​block slides into the snap-fit ​​interface; when the concealed needle sleeve returns to its original position downward, the injection needle of the vial assembly is concealed, the concealed needle sleeve causes the limiting ring to slide down until the limiting buckle slides out of the pen body, and the limiting buckle stops at the end face of the pen body.

[0007] In one optional embodiment, the side wall of the hidden needle sleeve is provided with a first through groove, a first spring piece is provided in the first through groove, and the snap-fit ​​block is provided at the end of the first spring piece.

[0008] In one optional embodiment, the first spring and the snap-fit ​​block are arc-shaped, and the first spring and the snap-fit ​​block are coaxial with the hidden pin sleeve.

[0009] In one optional embodiment, the card interface is a through groove formed in the side wall of the limiting ring, the inner wall of the limiting ring is provided with a guide block, the top of the guide block is flush with the bottom surface of the card interface, and the side wall of the guide block is an inclined surface to guide the card block to slide into the card interface, and after the card block slides into the card interface, the top of the guide block abuts against the card block.

[0010] In one alternative implementation, one side of the first spring is connected to the first through groove, while the other three sides are free surfaces.

[0011] In one optional embodiment, the outer wall of the limiting ring is provided with a second through groove, and a second spring piece is provided in the second through groove. The limiting buckle is provided at the end of the second spring piece, wherein when the limiting ring does not slide out of the pen body, the second spring piece deforms toward the axis of the limiting ring so that the limiting buckle abuts against the inner wall of the pen body.

[0012] In one alternative implementation, one side of the second spring is connected to the second through groove, while the other three sides are free surfaces.

[0013] In one alternative implementation, there are two snap-fit ​​blocks arranged symmetrically about the central plane of the hidden pin sleeve, and correspondingly, there are two snap-fit ​​interfaces.

[0014] Secondly, this disclosure also provides an injection pen, comprising: a pen body, wherein a vial assembly is disposed within the pen body, an injection needle of the vial assembly extends out of the pen body, and a directional protrusion is provided on the side wall of the vial assembly; and the aforementioned needle protection mechanism, wherein a directional notch is provided on the side wall of the concealed needle sleeve, and the directional protrusion is inserted into the directional notch.

[0015] In one optional embodiment, the inner wall of the pen body is provided with a directional groove; the side wall of the limiting ring is provided with a directional block, and the directional block is engaged in the directional groove.

[0016] The beneficial effects of this utility model are that the needle protection mechanism and injection pen have a snap-fit ​​block set on the side wall of the hidden needle sleeve. When the hidden needle sleeve retracts, the snap-fit ​​block slides into the snap-fit ​​interface to engage with the snap-fit ​​block. When the hidden needle sleeve resets, it drives the limiting ring to slide down so that the limiting buckle engages with the end face of the pen body, thereby preventing the hidden needle sleeve from retracting again and avoiding secondary contamination.

[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 the hidden needle sleeve and the limiting ring provided in the embodiments of this disclosure;

[0022] Figure 3 A state diagram of the pre-injection limiting ring provided in an embodiment of this disclosure;

[0023] Figure 4 This is a state diagram of the limiting ring after injection, provided in an embodiment of this disclosure.

[0024] Figure 5 This is a cross-sectional view of the pen body according to an embodiment of the present disclosure.

[0025] In the picture:

[0026] 1. Pen body; 11. Orientation groove;

[0027] 2. Medicine bottle assembly; 21. Injection needle; 22. Orientation bump;

[0028] 3. Concealed pin sleeve; 31. Snap-fit ​​block; 32. First through groove; 33. First spring piece; 34. Orientation notch;

[0029] 4. Limiting ring; 41. Card interface; 42. Limiting buckle; 43. Guide block; 44. Second through groove; 45. Second spring piece; 46. Orienting block. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Research has found that in existing technologies, pressing the pen body again after injection still exposes the injection needle, which can easily lead to secondary contamination. This is the problem and objective that the utility model aims to solve.

[0035] Based on the above research, this disclosure provides a needle protection mechanism and an injection pen. By setting a limiting ring inside the pen body, when the hidden needle sleeve retracts, it engages with the limiting ring. When the hidden needle sleeve returns to its original position, it causes the limiting ring to slide out. The limiting ring engages with the end face of the pen body to prevent the hidden needle sleeve from retracting again and exposing the injection needle.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] See Figures 1 to 5 This paper illustrates a needle protection mechanism, comprising: a concealed needle sleeve 3, which is fitted onto a vial assembly 2, and a locking block 31 on its side wall; and a limiting ring 4, which is fitted onto the concealed needle sleeve 3, and has a locking interface 41 on its side wall and a limiting buckle 42 on its outer wall. When injection begins, the concealed needle sleeve 3 presses against the skin and slides upwards, exposing the injection needle 21 of the vial assembly 2, and the locking block 31 slides into the locking interface 41. After injection, the needle... When the concealed needle sleeve 3 is reset downwards, the injection needle 21 of the vial assembly 2 is hidden. The concealed needle sleeve 3 drives the limiting ring 4 to slide down until the limiting buckle 42 slides out of the pen body 1. The limiting buckle 42 stops at the end face of the pen body 1. In short, by setting a snap-fit ​​block 31 on the side wall of the concealed needle sleeve 3, when the concealed needle sleeve 3 retracts, the snap-fit ​​block 31 slides into the snap-fit ​​interface 41 to engage the limiting ring 4. When the concealed needle sleeve 3 is reset, it drives the limiting ring 4 to slide down so that the limiting buckle 42 engages with the end face of the pen body 1, thereby preventing the concealed needle sleeve 3 from retracting again and avoiding secondary contamination.

[0040] The side wall of the concealed needle sleeve 3 is provided with a first through groove 32, and a first spring piece 33 is provided in the first through groove 32. The snap-fit ​​block 31 is provided at the end of the first spring piece 33. In short, the snap-fit ​​block 31 is provided at the end of the first spring piece 33. When the concealed needle sleeve 3 slides upward, the snap-fit ​​block 31 is first squeezed inward by the limiting ring 4. When the snap-fit ​​block 31 slides to the snap-fit ​​interface 41, the first spring piece 33 resets so that the snap-fit ​​block 31 slides into the snap-fit ​​interface 41 to engage the limiting ring 4.

[0041] The first spring piece 33 and the locking block 31 are arc-shaped, and the first spring piece 33 and the locking block 31 are coaxial with the hidden needle sleeve 3. In short, the first spring piece 33 is coaxial with the hidden needle sleeve 3, which can ensure that the hidden needle sleeve 3 will not interfere with other components when it slides. The locking block 31 is arc-shaped, which can ensure that the locking block 31 is in line contact with the limiting ring 4, and ensure that the locking block 31 is stably squeezed.

[0042] The card interface 41 is a through groove formed on the side wall of the limiting ring 4. The inner wall of the limiting ring 4 is provided with a guide block 43. The top of the guide block 43 is flush with the bottom surface of the card interface 41. The side wall of the guide block 43 is an inclined surface to guide the card engaging block 31 to slide into the card interface 41. After the card engaging block 31 slides into the card interface 41, the top of the guide block 43 abuts against the card engaging block 31. In short, the inner wall of the limiting ring 4 will squeeze the card engaging block 31 to make the card engaging block 31 move inward. The inclined surface of the side wall of the guide block 43 can smoothly squeeze the card engaging block 31. After the card engaging block 31 slides into the card interface 41, the top of the guide block 43 can abut against the card engaging block 31 to complete the fastening of the hidden pin sleeve 3 and the limiting ring 4.

[0043] One side of the first spring piece 33 is connected to the first through groove 32, while the other three sides are free surfaces. In short, the end of the first spring piece 33 away from the locking block 31 is connected to the first through groove 32 so that the first spring piece 33 can deform better and ensure the flexibility of the locking block 31.

[0044] The outer wall of the limiting ring 4 is provided with a second through groove 44, and a second spring piece 45 is provided in the second through groove 44. The limiting buckle 42 is provided at the end of the second spring piece 45. When the limiting ring 4 has not slid out of the pen body 1, the second spring piece 45 deforms towards the axis of the limiting ring 4 so that the limiting buckle 42 abuts against the inner wall of the pen body 1. In short, the setting of the second spring piece 45 enables the limiting buckle 42 to maintain abutment against the inner wall of the pen body 1 when the limiting ring 4 is in the initial position, preventing the position of the limiting ring 4 from changing and ensuring that the limiting ring 4 can be fastened by the hidden pin sleeve 3.

[0045] One side of the second spring piece 45 is connected to the second through groove 44, while the other three sides are free surfaces. In short, the end of the second spring piece 45 away from the limiting buckle 42 is connected to the second through groove 44, so that the second spring piece 45 can bend stably, ensuring the pressure between the limiting buckle 42 and the inner wall of the pen body 1.

[0046] There are two snap-fit ​​blocks 31, which are symmetrically arranged about the central plane of the hidden needle sleeve 3. Correspondingly, there are two snap-fit ​​interfaces 41. In short, there is a pair of snap-fit ​​blocks 31. When the limiting ring 4 is driven down by the hidden needle sleeve 3, there are two force points to ensure that the limiting ring 4 can slide stably until the limiting buckle 42 slides out of the pen body 1.

[0047] Secondly, this disclosure also provides an injection pen, including: a pen body 1, a vial assembly 2 disposed within the pen body 1, an injection needle 21 extending out of the pen body 1, and a directional protrusion 22 disposed on the side wall of the vial assembly 2; the aforementioned needle protection mechanism, wherein a directional notch 34 is provided on the side wall of the concealed needle sleeve 3, and the directional protrusion 22 is inserted into the directional notch 34; in short, this arrangement ensures that the circumferential position of the concealed needle sleeve 3 is fixed so that the locking block 31 can stably slide into the locking interface 41; a directional groove 11 is provided on the inner wall of the pen body 1; a directional block 46 is provided on the side wall of the limiting ring 4, and the directional block 46 is locked in the directional groove 11; furthermore, the limiting ring 4 is also limited in its circumferential position to ensure that it can be stably fastened by the concealed needle sleeve 3.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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 needle protection mechanism, characterized in that, include: Hidden needle sleeve (3), the hidden needle sleeve (3) is sleeved on the medicine bottle assembly (2), and the side wall of the hidden needle sleeve (3) is provided with a snap-fit ​​block (31). A limiting ring (4) is sleeved on the hidden needle sleeve (3). The side wall of the limiting ring (4) is provided with a card interface (41). The outer wall of the limiting ring (4) is provided with a limiting buckle (42). When the hidden needle sleeve (3) slides upward, the injection needle (21) of the vial assembly (2) is exposed, and the snap-fit ​​block (31) slides into the snap-fit ​​interface (41). When the hidden needle sleeve (3) is reset downwards, the injection needle (21) of the vial assembly (2) is hidden, and the hidden needle sleeve (3) drives the limiting ring (4) to slide down to the limiting buckle (42) and slide out of the pen body (1). The limiting buckle (42) stops at the end face of the pen body (1).

2. The needle protection mechanism as described in claim 1, characterized in that, The side wall of the hidden needle sleeve (3) is provided with a first through groove (32), and a first spring piece (33) is provided in the first through groove (32). The snap-fit ​​block (31) is provided at the end of the first spring piece (33).

3. The needle protection mechanism as described in claim 2, characterized in that, The first spring piece (33) and the snap-fit ​​block (31) are arc-shaped, and the first spring piece (33) and the snap-fit ​​block (31) are coaxial with the hidden pin sleeve (3).

4. The needle protection mechanism as described in claim 3, characterized in that, The card interface (41) is a through groove formed on the side wall of the limiting ring (4), and the inner wall of the limiting ring (4) is provided with a guide block (43). The top of the guide block (43) is flush with the bottom surface of the card interface (41). The sidewall of the guide block (43) is an inclined surface to guide the snap-fit ​​block (31) to slide into the card interface (41), and after the snap-fit ​​block (31) slides into the card interface (41), the top of the guide block (43) abuts against the snap-fit ​​block (31).

5. The needle protection mechanism as described in claim 2, characterized in that, The first spring piece (33) is connected to the first through groove (32) on one side, and the other three sides are free surfaces.

6. The needle protection mechanism as described in claim 1, characterized in that, The outer wall of the limiting ring (4) is provided with a second through groove (44), and a second spring piece (45) is provided in the second through groove (44). The limiting buckle (42) is provided at the end of the second spring piece (45). When the limiting ring (4) does not slide out of the pen body (1), the second spring piece (45) deforms toward the axis of the limiting ring (4) so ​​that the limiting buckle (42) abuts against the inner wall of the pen body (1).

7. The needle protection mechanism as described in claim 6, characterized in that, The second spring (45) is connected to the second through groove (44) on one side, and the other three sides are free surfaces.

8. The needle protection mechanism as described in claim 1, characterized in that, There are two snap-fit ​​blocks (31), which are symmetrically arranged about the central plane of the hidden pin sleeve (3). Correspondingly, there are two snap-fit ​​interfaces (41).

9. An injection pen, characterized in that, include: The pen body (1) is provided with a medicine bottle assembly (2) inside the pen body (1), the injection needle (21) of the medicine bottle assembly (2) extends out of the pen body (1), and the side wall of the medicine bottle assembly (2) is provided with a directional protrusion (22). According to any one of claims 1-8, the needle protection mechanism is provided with a directional notch (34) on the side wall of the hidden needle sleeve (3), and the directional protrusion (22) is inserted into the directional notch (34).

10. The injection pen as described in claim 9, characterized in that, The inner wall of the pen body (1) is provided with a directional groove (11); The side wall of the limiting ring (4) is provided with a directional block (46), which is engaged in the directional groove (11).

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