A needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen

Abstract

This invention discloses a needle-puncture prevention safety structure for the insertion end of an insulin pen needle, comprising a needle hub, a needle body, an inner shell, and a safety component. The needle hub has an installation cavity, which includes an upper chamber and a lower chamber. The needle body is fixedly mounted on the central axis of the needle hub. The inner shell is rotatably disposed in the lower chamber. The needle hub and the inner shell are fitted with a first limiting structure that restricts the rotational travel of the inner shell. The safety component is vertically movable and disposed in the upper chamber. The safety component has a channel at its center for the needle body to pass through. An elastic element is provided between the needle hub and the safety component, and the component tends to move towards the lower chamber under the action of the elastic element. The upper end of the inner shell has a through hole for the safety component to pass through. The safety component and the inner shell are fitted with a second limiting structure that restricts the downward movement of the safety component. Through the above design, the problem of medical personnel being easily punctured by the needle insertion end can be effectively solved.

Description

Technical Field

[0001] This invention relates to the technical field of medical devices, and in particular to a needle-puncture prevention safety structure for the insertion end of a needle used with an insulin pen. Background Technology

[0002] Insulin injection devices, such as insulin pens and needles, are widely used as a tool for treating diabetes. Their main function is to accurately deliver insulin into the body of diabetic patients through injection devices to control their blood sugar levels, and the demand for them is increasing.

[0003] Traditional insulin injection needles consist of a needle hub, needle body, and protective shell. Before use, removing the protective shell exposes the insulin needle directly. After use, the lack of a safety protection structure makes accidental contact with the needle tip a risk of cross-infection. Therefore, engineers have designed a safety protection device that conceals the needle tip within a safety component after use. Although the vial side of the needle body is inside the needle hub after use, the relatively large diameter of the mounting hole on the vial side poses a risk of needle prick to healthcare workers. Thus, a protective structure for the vial end of the needle used with insulin pens needs to be designed. Furthermore, existing protective structures have complex components, are difficult to manufacture, and therefore have high production costs. Summary of the Invention

[0004] The purpose of this invention is to provide a needle-proof safety structure for the insertion end of the needle used with an insulin pen. When the insulin pen is separated from the inner shell, the safety component, under the action of the elastic component, passes through the through hole and extends into the lower end cavity, so as to hide the insertion end of the needle in the channel of the safety component, thereby effectively solving the problem that medical staff are easily pricked by the insertion end of the needle.

[0005] The above-mentioned technical objective of this invention is achieved through the following technical solution: a needle insertion end anti-needle-puncture safety structure for an insulin pen needle, comprising a needle hub, a needle body, an inner shell, and a safety component. The needle hub has an installation cavity, which includes an upper chamber and a lower chamber, which are connected and a stepped surface is formed between them. The needle body is fixedly mounted on the central axis of the needle hub. The inner shell is rotatably disposed within the lower chamber. The needle hub and the inner shell are fitted with a first limiting structure that restricts the rotational travel of the inner shell. The upper end face of the inner shell abuts against the stepped surface. The safety component is vertically movably disposed in the upper cavity. The center of the safety component has a channel for the needle body to pass through. An elastic element is provided between the needle seat and the safety component. Under the action of the elastic element, the safety component tends to move towards the lower cavity. The upper end of the inner shell has a through hole for the safety component to pass through. The safety component and the inner shell cooperate to form a second limiting structure that restricts the downward movement of the safety component. During assembly, the safety component and the through hole of the inner shell are staggered to restrict the safety component from passing through the through hole. When the inner shell rotates relative to the needle seat to the maximum rotation stroke, the lower end of the safety component is aligned with the through hole so that the safety component extends into the through hole.

[0006] Furthermore, the first limiting structure includes an arc-shaped groove disposed on the inner wall of the lower cavity and a limiting block disposed on the outer wall of the inner shell. The needle seat is provided with a connecting groove for the limiting block to extend into the arc-shaped groove. The axial movement of the inner shell relative to the needle seat is restricted by the cooperation between the arc-shaped groove and the limiting block. When the limiting block rotates from the connecting groove to abut against the inner groove surface of the arc-shaped groove, the through hole of the inner shell rotates from being offset from the safety component to being aligned with the safety component.

[0007] Furthermore, the second limiting structure includes elastic locking feet symmetrically arranged on the side end of the safety component and a flange arranged on the top of the safety component. After the safety component extends into the lower section chamber, the flange engages with the upper end face of the inner shell to limit the downward movement of the safety component relative to the inner shell, and the upper end face of the elastic locking feet engages with the inner end face of the inner shell to limit the upward movement of the safety component relative to the inner shell.

[0008] Furthermore, the needle holder includes a flat portion at the upper end and a cylindrical portion at the lower end, the outer diameter of the cylindrical portion being larger than the outer diameter of the flat portion, and the arcuate groove penetrating the upper end face of the cylindrical portion.

[0009] Furthermore, the top two sides of the flat portion are symmetrically provided with inclined surfaces that slope inward from bottom to top, and the inclined surfaces are provided with through grooves that connect to the upper chamber.

[0010] Furthermore, a guide post is provided at the top inner end of the flat portion, and the elastic element is sleeved on the outer periphery of the guide post. One end of the elastic element abuts against the top inner end of the flat portion, and the other end of the elastic element abuts against the safety element.

[0011] Furthermore, the arc-shaped grooves are provided in two sets and are arranged symmetrically on the inner wall of the lower cavity. The limiting blocks correspond one-to-one with the arc-shaped grooves, and the inner wall of the needle seat is provided with connecting grooves that correspond one-to-one with the arc-shaped grooves.

[0012] Furthermore, the inner wall of the flat portion is provided with a vertically arranged guide post, and the safety component is provided with a guide groove that cooperates with the guide post.

[0013] Furthermore, the inner shell is provided with a receiving cavity with a through hole, and the inner wall of the receiving cavity is provided with a threaded portion.

[0014] Furthermore, a guide portion is provided at the connection between the flat portion and the cylindrical portion, corresponding to the position of the upper chamber inlet end, to facilitate the assembly of the safety component into the upper chamber.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. A needle-puncture prevention safety structure for the insertion end of an insulin pen needle, wherein when the insulin pen is separated from the inner shell, the safety component can pass through the through hole and extend into the lower end cavity under the action of the elastic component, so as to hide the insertion end of the needle in the channel of the safety component, thereby effectively solving the problem that medical staff are easily punctured by the insertion end of the needle.

[0017] 2. By redesigning the structure of the needle holder, safety components, and inner shell, the structure of each individual component is made simpler and easier to manufacture. At the same time, the overall structure is more compact and more comfortable to use after the components are assembled into one unit. Attached Figure Description

[0018] Figure 1 This is an exploded view of the present invention.

[0019] Figure 2 This is a schematic diagram of the bottom structure of the needle holder of the present invention.

[0020] Figure 3 This is a first-view sectional view of the safety component of the present invention when it is assembled into the upper chamber.

[0021] Figure 4 This is a second-view sectional view of the safety component of the present invention when it is assembled into the upper chamber.

[0022] Figure 5 This is a first-view cross-sectional view of the safety component of the present invention when it extends into the lower chamber.

[0023] Figure 6 This is a second-view cross-sectional view of the safety component of the present invention when it extends into the lower chamber.

[0024] In the diagram: 1. Needle seat; 11. Mounting cavity; 111. Upper chamber; 112. Lower chamber; 113. Stepped surface; 12. Arc groove; 13. Connecting groove; 14. Flat part; 141. Guide post; 142. Guide post; 143. Inclined surface; 144. Through groove; 15. Cylindrical part; 16. Guide part; 2. Needle body; 3. Inner shell; 31. Through hole; 32. Limiting block; 4. Safety component; 41. Elastic locking foot; 42. Flange; 43. Guide groove; 5. Elastic component. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] like Figures 1-6 As shown, a needle insertion end anti-puncture safety structure for an insulin pen needle includes a needle hub 1, a needle body 2, an inner shell 3, and a safety component 4. The needle hub 1 includes a flat portion 14 at the upper end and a cylindrical portion 15 at the lower end. The outer diameter of the cylindrical portion 15 is larger than the outer diameter of the flat portion 14. A step is formed between the cylindrical portion 15 and the flat portion 14. The needle hub 1 has a mounting cavity 11, which includes an upper chamber 111 and a lower chamber 112. The upper section chamber 111 and the lower section chamber 112 are connected and a stepped surface 113 is formed between the upper section chamber 111 and the lower section chamber 112. Specifically, the upper section chamber 111 is disposed in the flat part 14 and the lower section chamber 112 is disposed in the cylindrical part 15. The upper section of the needle holder 1 is configured as a flat structure to facilitate the assembly personnel to hold and assemble safety parts 4 and other parts. Of course, as an equivalent alternative, the upper section of the needle holder 1 can also be configured as a columnar structure.

[0027] The needle body 2 is fixedly mounted on the central axis of the needle seat 1. The safety member 4 is vertically movable in the upper chamber 111. The safety member 4 has a channel in the center for the needle body 2 to pass through. An elastic member 5 is provided between the needle seat 1 and the safety member 4. Under the action of the elastic member 5, the safety member 4 has a tendency to move towards the lower chamber 112. Furthermore, the top inner end of the flat part 14 is provided with a guide post 141. The elastic member 5 is sleeved on the outer periphery of the guide post 141. One end of the elastic member 5 abuts against the top inner end of the flat part 14, and the other end of the elastic member 5 abuts against the safety member 4.

[0028] The inner shell 3 is rotatably disposed within the lower chamber 112, with its upper surface abutting against the stepped surface 113. The needle holder 1, in cooperation with the inner shell 3, is provided with a first limiting structure to restrict the rotational stroke of the inner shell 3. The first limiting structure includes an arc-shaped groove 12 disposed on the inner wall of the lower chamber 112 and a limiting block 32 disposed on the outer wall of the inner shell 3. The needle holder 1 is provided with a connecting groove 13 for the limiting block 32 to extend into the arc-shaped groove 12. The axial movement of the inner shell 3 relative to the needle holder 1 is restricted by the cooperation of the arc-shaped groove 12 and the limiting block 32. When the inner shell 3 rotates relative to the needle holder 1 to its maximum rotational stroke, that is, when the limiting block 32 rotates from the connecting groove 13 to abutting against the inner groove surface of the arc-shaped groove 12, the through hole 31 of the inner shell 3 rotates from being offset from the safety member 4 to being aligned with the safety member 4.

[0029] In this invention, the arc-shaped groove 12 penetrates the upper end face of the cylindrical part 15. The purpose of this setting is to save materials and facilitate processing. The arc-shaped groove 12 is provided in two sets and is centrally symmetrically arranged on the inner wall of the lower cavity 112. The limiting block 32 corresponds to the arc-shaped groove 12 one by one. The inner wall of the needle seat 1 is provided with a communicating groove 13 corresponding to the arc-shaped groove 12 one by one. By setting two sets, the assembly of the needle seat 1 and the inner shell 3 is more stable, the connection is more reliable, and the inner shell 3 rotates more smoothly relative to the needle seat 1.

[0030] The upper end of the inner shell 3 is provided with a through hole 31 for the safety component 4 to pass through. The inner shell 3 has a receiving cavity communicating with the through hole. The inner wall of the receiving cavity is provided with a threaded portion. During assembly, the safety component 4 is offset from the through hole 31 of the inner shell 3 to restrict the safety component 4 from passing through the through hole 31. When the inner shell 3 rotates relative to the needle holder 1 to its maximum rotation stroke (that is, when the limiting block 32 rotates to abut against the inner groove surface of the arc-shaped groove 12), the lower end of the safety component 4 aligns with the through hole 31 so that the safety component 4 can extend into the through hole 31. Specifically, when the insulin pen is not engaged with the inner shell 3, because the safety component 4 is offset from the through hole 31, the safety component 4 is blocked by the upper surface of the inner shell 3 and cannot extend into the mounting cavity 11 through the through hole 31. When the matching needle is needed, the insulin... The pen is inserted into the inner shell 3 and threadedly connected to the threaded part of the inner shell 3. Under the action of the insulin pen, the inner shell 3 rotates to its maximum stroke (the position when the limiting block 32 abuts against the inner end face of the arc groove 12). At this time, the safety member 4 is aligned with the through hole 31 of the inner shell 3. Under the action of the elastic member 5, the safety member 4 moves down to the position of the through hole 31 of the inner shell 3. After the insulin injection is completed, the insulin pen is unscrewed. Due to the restriction of the safety member 4, the inner shell 3 will not rotate with the insulin pen. During the process of the insulin pen being unscrewed out of the inner shell 3, the safety member 4 moves down with the inner shell 3 under the action of the elastic member 5 until the flange 42 abuts against the upper end face of the inner shell 3, thereby making the bottle insertion end of the needle body 2 hidden in the channel of the safety member 4, thus effectively solving the problem that medical staff are easily pricked by the bottle insertion end of the needle body 2.

[0031] The safety component 4 and the inner shell 3 cooperate to form a second limiting structure that restricts the downward movement of the safety component 4. Specifically, the second limiting structure includes elastic locking feet 41 symmetrically arranged on the side of the safety component 4 and a flange 42 arranged on the top of the safety component 4. After the safety component 4 extends into the lower section chamber 112, the flange 42 is limited to the downward movement of the safety component 4 relative to the inner shell 3 by limiting the movement of the safety component 4 relative to the inner shell 3 by limiting the movement of the safety component 4 relative to the inner shell 3 by limiting the movement of the safety component 4 relative to the inner shell 3 by limiting the movement of the safety component 4 relative to the inner shell 3 by limiting the movement of the safety component 4 relative to the inner shell 3 by limiting the movement of the safety component 4 relative to the inner shell 3 by limiting the movement of the safety component 4 by the upper end face of the elastic locking feet 41 and the flange 42 respectively. By setting the second limiting structure, the safety component 4 can be stably maintained at the positions where the elastic locking feet 41 and the flange 42 are located on both sides of the upper end face of the cylindrical part 15, thereby keeping the needle body 2 in the channel of the safety component 4.

[0032] The top two sides of the flat part 14 are symmetrically provided with inclined surfaces 143 that slope inward from bottom to top. The inclined surfaces 143 are provided with through grooves 144 that connect to the upper chamber 111. The needle seat 1 is integrally injection molded. By setting the inclined surfaces 143, the head of the needle seat 1 has an inward contraction structure, which can save manufacturing costs and reduce its overall weight. The needle seat 1 has a structure with a small head and a large bottom, which can also improve its stability.

[0033] The inner wall of the flat part 14 is provided with a vertically arranged guide post 142, and the safety component 4 is provided with a guide groove 43 that cooperates with the guide post 142. The guide post 142 and the guide groove 43 cooperate to limit the sliding trajectory of the safety component 4, and at the same time enable the safety component 4 to slide more smoothly relative to the upper chamber 111.

[0034] The guide post 142 is provided in two sets and symmetrically arranged on the inner wall of the flat part 14. The guide groove 43 corresponds to the guide post 142 one by one. The guide groove 43 and the elastic locking foot 41 are arranged circumferentially around the safety member 4 in a staggered manner. This arrangement makes the structure of the safety member 4 more compact and the integration higher.

[0035] At the connection between the flat portion 14 and the cylindrical portion 15, a guide portion 16 is provided at the position corresponding to the entrance end of the upper chamber 111. The guide portion 16 facilitates the assembly of the safety component 4 into the upper chamber 111.

[0036] By redesigning the structure of the needle holder 1, safety component 4, and inner shell 3, the structure of each individual component is made simpler and easier to manufacture. At the same time, the overall structure is more compact and more comfortable to use after the components are assembled into one.

[0037] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A needle-puncture prevention safety structure for the insertion end of an insulin pen needle, comprising a needle holder (1), a needle body (2), an inner shell (3), and a safety component (4), characterized in that: The needle holder (1) has an installation cavity (11) which includes an upper chamber (111) and a lower chamber (112). The upper chamber (111) and the lower chamber (112) are connected and a stepped surface (113) is formed between them. The needle body (2) is fixedly mounted on the central axis of the needle holder (1). The inner shell (3) is rotatably disposed in the lower chamber (112). The needle holder (1) and the inner shell (3) are fitted with a first limiting structure that restricts the rotation stroke of the inner shell (3). The upper end face of the inner shell (3) abuts against the stepped surface (113). The safety component (4) is vertically movable in the upper chamber (111). The safety component (4) has a centrally located... There is a channel through which the needle body (2) passes. An elastic element (5) is provided between the needle seat (1) and the safety element (4). Under the action of the elastic element (5), the safety element (4) tends to move towards the lower section chamber (112). The upper end of the inner shell (3) is provided with a through hole (31) through which the safety element (4) passes. The safety element (4) and the inner shell (3) cooperate to form a second limiting structure that restricts the downward movement of the safety element (4). During assembly, the safety element (4) and the through hole (31) of the inner shell (3) are staggered to restrict the safety element (4) from passing through the through hole (31). When the inner shell (3) rotates relative to the needle seat (1) to the maximum rotation stroke, the lower end of the safety element (4) is aligned with the through hole (31) so that the safety element (4) extends into the through hole (31).

2. The needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen according to claim 1, characterized in that: The first limiting structure includes an arc-shaped groove (12) disposed on the inner wall of the lower section chamber (112) and a limiting block (32) disposed on the outer wall of the inner shell (3). The needle seat (1) is provided with a connecting groove (13) for the limiting block (32) to extend into the arc-shaped groove (12). The inner shell (3) is restricted from axial movement relative to the needle seat (1) by the cooperation of the arc-shaped groove (12) and the limiting block (32). When the limiting block (32) rotates from the connecting groove (13) to abut against the inner groove surface of the arc-shaped groove (12), the through hole (31) of the inner shell (3) rotates from being offset from the safety member (4) to being aligned with the safety member (4).

3. The needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen according to claim 2, characterized in that: The second limiting structure includes elastic locking feet (41) symmetrically arranged on the side of the safety member (4) and a flange (42) arranged on the top of the safety member (4). After the safety member (4) extends into the lower section chamber (112), the flange (42) is used to limit the movement of the safety member (4) relative to the inner shell (3) by limiting the movement of the safety member (4) relative to the inner shell (3) by limiting the movement of the safety member (4) relative to the inner shell (3) by limiting the movement of the safety member (4) relative to the inner shell (3) by limiting the movement of the safety member (4) relative to the inner shell (3) by limiting the movement of the safety member (4) relative to the inner shell (3) by limiting the movement of the safety member (4) relative to the inner shell (3) by the upper end of the elastic locking feet (41).

4. The needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen according to claim 2, characterized in that: The needle seat (1) includes a flat portion (14) at the upper end and a cylindrical portion (15) at the lower end. The outer diameter of the cylindrical portion (15) is larger than the outer diameter of the flat portion (14). The arc groove (12) penetrates the upper end face of the cylindrical portion (15).

5. The needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen according to claim 4, characterized in that: The top two sides of the flat part (14) are symmetrically provided with inclined surfaces (143) that slope inward from bottom to top, and the inclined surfaces (143) are provided with through grooves (144) that connect to the upper chamber (111).

6. The needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen according to claim 4, characterized in that: The top inner end of the flat part (14) is provided with a guide post (141), and the elastic element (5) is sleeved on the outer periphery of the guide post (141). One end of the elastic element (5) abuts against the top inner end of the flat part (14), and the other end of the elastic element (5) abuts against the safety element (4).

7. The needle-puncture prevention safety structure for the vial end of an insulin pen needle according to claim 2, characterized in that: The arc-shaped groove (12) is provided in two sets and is arranged in a centrally symmetrical manner on the inner wall of the lower section chamber (112). The limiting block (32) corresponds to the arc-shaped groove (12) one by one. The inner wall of the needle seat (1) is provided with a connecting groove (13) that corresponds to the arc-shaped groove (12) one by one.

8. The needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen according to claim 4, characterized in that: The inner wall of the flat part (14) is provided with a vertically arranged guide post (142), and the safety component (4) is provided with a guide groove (43) that guides and cooperates with the guide post (142).

9. The needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen according to claim 1, characterized in that: The inner shell (3) has a receiving cavity with a through hole (31) inside, and the inner wall of the receiving cavity has a threaded part.

10. The needle-puncture prevention safety structure for the insertion end of the needle used with an insulin pen according to claim 4, characterized in that: The connection between the flat part (14) and the cylindrical part (15) is provided with a guide part (16) at the position corresponding to the entrance end of the upper chamber (111) to facilitate the assembly of the safety component (4) into the upper chamber (111).

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