Disposable safety insulin pen needle
By designing a rotating locking mechanism for the needle tip protective sleeve and locking ring, the problems of complex structure and easy failure of existing insulin pen needles are solved, achieving safe and convenient single-use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU CAINA MEDICAL TECH
- Filing Date
- 2025-02-21
- Publication Date
- 2026-07-31
AI Technical Summary
Existing insulin pen needles have complex structures, are cumbersome to trigger, are prone to failure, and pose a risk of cross-infection.
A disposable safety insulin pen needle was designed, which adopts a needle tip protective sleeve and locking ring structure. The needle tip protective sleeve is locked by the rotation of the locking ring during injection and needle withdrawal, ensuring that the needle tip cannot be retracted after use.
The product structure has been simplified, costs have been reduced, safety and convenience of use have been improved, needle puncture has been prevented, and single-use has been achieved.
Smart Images
Figure CN224573044U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a disposable safe insulin pen needle. Background Technology
[0002] Insulin injection, as a treatment for diabetes, is widely used. Its main function is to precisely deliver insulin into the body of diabetic patients through an injection device to control blood sugar levels. Traditional injection methods use a needle structure. After removing the protective shell before use, the insulin needle is directly exposed. Because there is no safety protection structure after use, it is easy to accidentally touch the needle and cause cross-infection. In addition, there is a risk of reuse.
[0003] Existing insulin pen needles are portable and have needle protection designs, but the structures of these products are complex and varied. In particular, when protecting the tip of the needle, various parts need to move and rotate to trigger the process. This results in problems such as complex principles, high manufacturing costs, a large number of parts, cumbersome assembly, and high failure rates. Further optimization is needed. Utility Model Content
[0004] The purpose of this invention is to provide a disposable, safe insulin pen needle to solve the problems of complex structure, cumbersome triggering, and easy failure of existing insulin pen needles.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A disposable safety insulin pen needle includes a housing and a needle hub. The housing has an opening at its tail end and an end face hole at its head end. The needle hub is located at the tail end of the housing and has an injection needle extending from the head end of the housing and protruding from the end face hole. The disposable safety insulin pen needle also includes a needle tip protective sleeve and a locking ring. The needle tip protective sleeve is located in the housing, and the locking ring is located in the needle tip protective sleeve. A spring is provided between the locking ring and the needle hub. The inner wall of the housing has a first limiting groove and a second limiting groove. The head end of the second limiting groove has a stop edge. The outer wall of the needle tip protective sleeve has a first protrusion that slides in the first limiting groove. The tail end edge of the needle tip protective sleeve has a guide surface that extends from one axial side of the first protrusion to one circumferential side of the first protrusion. The outer wall of the locking ring has a second protrusion that slides along the guide surface and in the first limiting groove.
[0007] In the injection state, the needle tip protective sleeve drives the locking ring to compress the spring and retract into the outer shell, exposing the needle tip of the injection needle. The second protrusion rotates relative to the needle tip protective sleeve along the guide surface and moves from the first limiting groove to the second limiting groove.
[0008] In the retracted state, the locking ring, under the action of the spring, pushes the needle tip protective sleeve out of the end face and covers the needle tip of the injection needle, and the second protrusion is limited by the stop edge, thereby preventing the needle tip protective sleeve from retracting into the outer shell again.
[0009] As an alternative, both the first limiting groove and the second limiting groove are arranged axially, and the second limiting groove is located on one side of the first limiting groove in the circumferential direction. The end of the first limiting groove is connected to the end of the second limiting groove.
[0010] As an alternative, a partition rib is provided between the first limiting groove and the second limiting groove, and a guide slope is provided on the partition rib to guide the second protrusion from the second limiting groove to the first limiting groove.
[0011] As an alternative, the second protrusion is provided with an inclined plane that slides with the guide surface and a locking plane that limits the movement with the stop edge.
[0012] As an alternative, the first limiting groove has a stop at its groove head end to limit the first protrusion. The stop is used to prevent the needle tip protective sleeve from coming out of the outer shell.
[0013] As an alternative, the outer wall of the needle tip protective sleeve has multiple first protrusions evenly distributed around its circumference, the outer wall of the locking ring has multiple second protrusions evenly distributed around its circumference, the inner wall of the outer shell has multiple first limiting grooves and second limiting grooves evenly distributed around its circumference, and the tail end of the needle tip protective sleeve has multiple guide surfaces periodically arranged along its end. The number of first protrusions, the number of second protrusions, the number of first limiting grooves, the number of second limiting grooves, and the number of guide surfaces are all the same.
[0014] As an alternative, the needle holder is provided with a stepped surface, the locking ring is in the shape of a single-opening cylinder, one end of the spring abuts against the stepped surface, the other end of the spring passes through the locking ring and is abutted by the end face of the locking ring, and a needle tip clearance hole is provided on the end face of the locking ring.
[0015] As an alternative, the outer wall of the needle holder is provided with circumferential ribs and axial positioning ribs, and the inner wall of the outer shell is provided with grooves that mate with the circumferential ribs and positioning slots that mate with the axial positioning ribs.
[0016] The beneficial effects of this utility model are:
[0017] This disposable safety insulin pen is designed with a retractable needle tip protector to address the issue of exposed needle tips after use. It employs a locking ring that rotates relative to the needle tip protector during injection and needle withdrawal, thus limiting the travel of the protector and preventing it from retracting after covering the needle tip. This achieves the goal of single use and needle prick prevention, greatly simplifying the product structure, reducing costs, and improving safety and convenience. Attached Figure Description
[0018] Figure 1 This is an exploded view of the structure of a disposable safety insulin pen needle provided in an embodiment of this utility model;
[0019] Figure 2 This is a schematic diagram of the outer shell of the disposable safety insulin pen needle provided in this embodiment of the utility model;
[0020] Figure 3 This is a schematic diagram showing the cooperation between the needle tip protective sleeve and the locking ring in a disposable safety insulin pen needle provided by this utility model embodiment;
[0021] Figure 4 This is a schematic diagram of the structure of a disposable safety insulin pen needle before use, provided in this embodiment of the utility model.
[0022] Figure 5 This is a schematic diagram of the structure of a disposable safety insulin pen needle in the injection state provided in this embodiment of the utility model;
[0023] Figure 6 This is a schematic diagram of the structure of a disposable safety insulin pen needle in the needle-removed state, as provided in an embodiment of this utility model.
[0024] In the attached image:
[0025] 1. Outer shell; 11. End hole; 12. First limiting groove; 13. Second limiting groove; 14. Stop; 15. Partition rib; 151. Guide slope; 16. Stop block; 17. Embedded groove; 18. Positioning slot;
[0026] 2. Needle hub; 21. Injection needle; 22. Stepped surface; 23. Circumferential rib; 24. Axial positioning rib;
[0027] 3. Needle tip protective sleeve; 31. First protrusion; 32. Guide surface;
[0028] 4. Locking ring; 41. Second protrusion; 411. Inclined plane; 412. Locking plane;
[0029] 5. Spring. Detailed Implementation
[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.
[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] Furthermore, the terms "first" and "second" are merely used to distinguish between different terms in description and do not have any special meaning.
[0035] Please see Figures 1 to 6 As shown, this embodiment provides a disposable safety insulin pen needle, including a housing 1 and a needle hub 2. The housing 1 has an opening at the tail end and an end face 11 at the head end. The needle hub 2 is located at the tail end of the housing 1 and has an injection needle 21 that extends toward the head end of the housing 1 and protrudes from the end face 11.
[0036] Specifically, the disposable safety insulin pen needle also includes a needle tip protective sleeve 3 and a locking ring 4. The needle tip protective sleeve 3 is disposed in the outer shell 1, and the locking ring 4 is disposed in the needle tip protective sleeve 3. A spring 5 is disposed between the locking ring 4 and the needle seat 2. A first limiting groove 12 and a second limiting groove 13 are formed on the inner wall of the outer shell 1. A retaining edge 14 is provided at the groove head end of the second limiting groove 13. A first protrusion 31 that slides in the first limiting groove 12 is provided on the outer wall of the needle tip protective sleeve 3. A guide surface 32 is provided at the tail end edge of the needle tip protective sleeve 3. The guide surface 32 extends from one axial side of the first protrusion 31 to one circumferential side of the first protrusion 31. A second protrusion 41 that slides along the guide surface 32 and in the first limiting groove 12 is provided on the outer wall of the locking ring 4. See details. Figure 4 .
[0037] Based on the above structure, see details. Figure 5 In the injection state, the needle tip protective sleeve 3 drives the locking ring 4 to compress the spring 5 and retract into the outer shell 1, exposing the needle tip of the injection needle 21. The second protrusion 41 rotates along the guide surface 32 relative to the needle tip protective sleeve 3 and moves from the first limiting groove 12 to the second limiting groove 13.
[0038] See details Figure 6 In the needle retraction state, the locking ring 4, under the action of the spring 5, pushes the needle tip protective sleeve 3 out of the end face 11 and covers the needle tip of the injection needle 21, and the second protrusion 41 is limited by the stop 14, thereby preventing the needle tip protective sleeve 3 from retracting into the outer shell 1 again.
[0039] Therefore, in response to the situation where the needle tip of the injection needle 21 is exposed after use, a retractable needle tip protective sleeve 3 was designed. The principle of locking the needle tip protective sleeve 3 by rotating relative to it during injection and needle withdrawal is adopted to limit the stroke of the needle tip protective sleeve 3. This prevents the needle tip protective sleeve 3 from retracting after covering the needle tip, thus achieving the purpose of single use and preventing needle puncture. This greatly simplifies the product structure, reduces costs, and improves safety and convenience of use.
[0040] Optionally, the first limiting groove 12 and the second limiting groove 13 are both arranged axially, and the second limiting groove 13 is located on one side of the first limiting groove 12 in the circumferential direction, and the end of the first limiting groove 12 is connected to the end of the second limiting groove 13.
[0041] Thus, the second protrusion 41 can smoothly enter the second limiting groove 13 from the first limiting groove 12, ensuring that the locking ring 4 can rotate smoothly relative to the needle tip protective sleeve 3, thereby triggering the locking function of the locking ring 4.
[0042] Furthermore, a partition rib 15 is provided between the first limiting groove 12 and the second limiting groove 13, and a guide slope 151 is provided on the partition rib 15 to guide the second protrusion 41 from the second limiting groove 13 to the first limiting groove 12.
[0043] Thus, the second protrusion 41 can slide smoothly into the second limiting groove 13 along the guide slope 151 while sliding along the guide surface 32, avoiding retraction into the first limiting groove 12 and ensuring accurate operation.
[0044] Optionally, the second protrusion 41 is provided with an inclined plane 411 that slides in cooperation with the guide surface 32 and a locking plane 412 that limits the movement in cooperation with the stop edge 14.
[0045] Thus, the inclined plane 411 contacts the guide surface 32, ensuring the stability of the second protrusion 41 during sliding; the locking plane 412 and the stop edge 14 fit tightly together, blocking the axial movement of the locking ring 4, thereby locking the needle tip protective sleeve 3, preventing it from retracting again, ensuring that the needle tip is always covered, further improving the safety of use and avoiding accidental injury.
[0046] Optionally, the first limiting groove 12 is provided with a stop 16 at the groove head end to limit the first protrusion 31. The stop 16 is used to prevent the needle tip protective sleeve 3 from coming out of the outer shell 1.
[0047] Thus, the stop 16 is in close contact with the first protrusion 31, ensuring the structural stability of the needle tip protective sleeve 3 before use and during needle retraction, and preventing accidental detachment.
[0048] Optionally, the outer wall of the needle tip protective sleeve 3 is circumferentially distributed with a plurality of first protrusions 31, the outer wall of the locking ring 4 is circumferentially distributed with a plurality of second protrusions 41, the inner wall of the outer shell 1 is circumferentially distributed with a plurality of first limiting grooves 12 and second limiting grooves 13, and the tail end of the needle tip protective sleeve 3 is periodically arranged with a plurality of guide surfaces 32. The number of first protrusions 31, the number of second protrusions 41, the number of first limiting grooves 12, the number of second limiting grooves 13, and the number of guide surfaces 32 are all the same.
[0049] This ensures that each first protrusion 31 precisely engages with the first limiting groove 12, and each second protrusion 41 precisely engages with the first limiting groove 12, the second limiting groove 13, and the guide surface 32, thereby achieving synergistic effects between the components, ensuring that the needle tip protective sleeve 3 is stable and reliable during the extension and retraction process, further improving the overall structure's compactness and the smoothness of operation, effectively preventing misoperation, and ensuring user safety.
[0050] Optionally, the needle holder 2 is provided with a stepped surface 22, the locking ring 4 is in the shape of a single-opening cylinder, one end of the spring 5 abuts against the stepped surface 22, the other end of the spring 5 passes through the locking ring 4 and is abutted by the end face of the locking ring 4, and a needle tip clearance hole is provided on the end face of the locking ring 4.
[0051] Thus, the structure of the stepped surface 22 and the locking ring 4 enables reliable assembly of the spring 5 and keeps the spring 5 in a stable working state.
[0052] Optionally, the outer wall of the needle holder 2 is provided with a circumferential rib 23 and an axial positioning rib 24, and the inner wall of the outer shell 1 is provided with a groove 17 that mates with the circumferential rib 23 and a positioning slot 18 that mates with the axial positioning rib 24.
[0053] This ensures that the needle holder 2 is accurately installed inside the housing 1, prevents axial and radial movement, enhances the stability of the overall structure, and improves safety in use.
[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A disposable safety insulin pen needle, comprising a housing (1) and a needle hub (2), wherein the housing (1) has an opening at its tail end and an end face (11) is provided at its head end, the needle hub (2) is disposed at the tail end of the housing (1), and an injection needle (21) is disposed on the needle hub (2) extending toward the head end of the housing (1) and protruding from the end face (11), characterized in that, The disposable safety insulin pen needle also includes a needle tip protective sleeve (3) and a locking ring (4). The needle tip protective sleeve (3) is disposed in the outer shell (1), and the locking ring (4) is disposed in the needle tip protective sleeve (3). A spring (5) is disposed between the locking ring (4) and the needle seat (2). A first limiting groove (12) and a second limiting groove (13) are provided on the inner wall of the outer shell (1). A retaining edge (14) is provided at the groove head end of the second limiting groove (13). The outer wall of the needle tip protective sleeve (3) is provided with a first protrusion (31) that slides in the first limiting groove (12). The tail end of the needle tip protective sleeve (3) is provided with a guide surface (32). The guide surface (32) extends from one axial side of the first protrusion (31) to one circumferential side of the first protrusion (31). The outer wall of the locking ring (4) is provided with a second protrusion (41) that slides along the guide surface (32) in the first limiting groove (12). In the injection state, the needle tip protective sleeve (3) drives the locking ring (4) to compress the spring (5) and retract into the outer shell (1) and expose the needle tip of the injection needle (21). The second protrusion (41) rotates relative to the needle tip protective sleeve (3) along the guide surface (32) and transfers from the first limiting groove (12) to the second limiting groove (13). In the needle retraction state, the locking ring (4) pushes the needle tip protective sleeve (3) out of the end face (11) and covers the needle tip of the injection needle (21) under the action of the spring (5), and the second protrusion (41) is limited by the stop (14), thereby preventing the needle tip protective sleeve (3) from retracting into the outer shell (1) again.
2. The single-use safety insulin pen needle of claim 1, wherein, The first limiting groove (12) and the second limiting groove (13) are both arranged axially, and the second limiting groove (13) is located on one side of the first limiting groove (12) in the circumferential direction. The end of the first limiting groove (12) is connected to the end of the second limiting groove (13).
3. The single-use safety insulin pen needle of claim 2, wherein, A partition rib (15) is provided between the first limiting groove (12) and the second limiting groove (13), and the partition rib (15) is provided with a guide slope (151) to guide the second protrusion (41) from the second limiting groove (13) to the first limiting groove (12).
4. The single-use safety pen needle of claim 1, wherein, The second protrusion (41) is provided with an inclined plane (411) that slides in cooperation with the guide surface (32) and a locking plane (412) that limits the movement in cooperation with the stop edge (14).
5. The single-use safety insulin pen needle of claim 1, wherein, The first limiting groove (12) has a stop (16) at the groove head end to limit the first protrusion (31). The stop (16) is used to prevent the needle tip protective sleeve (3) from coming out of the outer shell (1).
6. The single-use safety insulin pen needle of claim 1, wherein, The outer wall of the needle tip protective sleeve (3) is evenly distributed with multiple first protrusions (31), the outer wall of the locking ring (4) is evenly distributed with multiple second protrusions (41), the inner wall of the outer shell (1) is evenly distributed with multiple first limiting grooves (12) and second limiting grooves (13), and the tail end of the needle tip protective sleeve (3) is periodically arranged with multiple guide surfaces (32). The number of first protrusions (31), the number of second protrusions (41), the number of first limiting grooves (12), the number of second limiting grooves (13), and the number of guide surfaces (32) are all the same.
7. The single-use safety insulin pen needle of claim 1, wherein, The needle holder (2) is provided with a stepped surface (22), the locking ring (4) is in the shape of a single-opening cylinder, one end of the spring (5) abuts against the stepped surface (22), the other end of the spring (5) passes through the locking ring (4) and is abutted by the end face of the locking ring (4), and a needle tip avoidance hole is provided on the end face of the locking ring (4).
8. The single-use safety insulin pen needle of claim 1, wherein, The outer wall of the needle seat (2) is provided with a circumferential rib (23) and an axial positioning rib (24), and the inner wall of the outer shell (1) is provided with a groove (17) that mates with the circumferential rib (23) and a positioning slot (18) that mates with the axial positioning rib (24).