Front-end needle-stick prevention insulin pen

Abstract

The application relates to the field of medical devices, in particular to a front-end needle-sticking-preventing insulin pen needle which comprises a shell, a needle seat fixed in the shell and provided with an injection needle extending out of the head end of the shell, a sliding buckle sleeved on the needle seat and in sliding cooperation with the needle seat, the outer surface of the sliding buckle being provided with a buckle part, a needle tip protection sleeve slidingly arranged in the shell, the inner wall of the needle tip protection sleeve being provided with a one-side-arranged elastic sheet, a spring being clamped between the needle tip protection sleeve and the needle seat, in an injection state, the needle tip protection sleeve being retracted into the shell, the needle tip protection sleeve being sleeved on the sliding buckle, the elastic sheet hooking the buckle part, and the needle tip of the injection needle being exposed, in a needle-withdrawing state, the needle tip protection sleeve extending out of the head end of the shell to cover the needle tip of the injection needle, the sliding buckle being driven to come off the needle seat, the sliding buckle being dislocated from the needle seat under the action of the elastic sheet, the end of the sliding buckle abutting against the end of the needle seat, and the needle tip protection sleeve being locked.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a front-end anti-needle-puncture insulin pen needle. Background Technology

[0002] Insulin injection, as a treatment for diabetes, has been widely used. Its main function is to precisely deliver insulin into the body of diabetic patients through an injection device in order to control their blood sugar levels.

[0003] Traditional injection devices use a needle structure, which includes a needle hub, a needle tube, and an outer protective shell. Before use, the protective shell is removed, leaving the insulin needle directly exposed. After use, due to the lack of a safety protection structure, accidental contact with the needle tip can easily occur, leading to cross-infection. In addition, there is a risk of it being reused.

[0004] Currently, a type of insulin pen needle has emerged on the market that is portable like a pen and has taken into account the needle tip protection design. However, the structure of such products is complex and varied. In particular, when protecting the tip of the needle, various parts need to move, rotate and cooperate 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 rate. Further optimization is needed. Summary of the Invention

[0005] Based on the above problems, the purpose of this invention is to provide a front-end anti-needle-puncture insulin pen needle, optimize the needle protection principle, simplify the product structure, improve the safety and convenience of use, and reduce costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An insulin pen needle with a puncture-proof tip, comprising:

[0008] shell;

[0009] The needle hub is fixed in the outer shell, and an injection needle protruding from the head end of the outer shell is provided on the needle hub;

[0010] A sliding buckle is fitted onto the needle holder and slides in cooperation with the needle holder; the outer surface of the sliding buckle is provided with a snap-fit ​​part.

[0011] The needle tip protective sleeve is slidably disposed in the outer shell. A spring piece is arranged on one side of the inner wall of the needle tip protective sleeve, and a spring is clamped between the needle tip protective sleeve and the needle base.

[0012] During injection, the needle tip protective sleeve retracts into the outer shell, is fitted onto the sliding buckle, and the spring clip hooks onto the buckle, allowing the needle tip of the injection needle to protrude.

[0013] In the needle-retracted state, the needle tip protective sleeve extends from the head end of the outer shell to cover the needle tip of the injection needle, and drives the sliding buckle to disengage from the needle seat. Under the action of the spring, the sliding buckle is misaligned with the needle seat, so that the end of the sliding buckle abuts against the end of the needle seat, thereby locking the needle tip protective sleeve.

[0014] Optionally, the spring is located at the tail end of the needle tip protective sleeve and extends obliquely toward the head end of the needle tip protective sleeve.

[0015] Optionally, a gap of 0.4mm to 0.8mm is left between the sliding buckle and the needle tip protective sleeve.

[0016] Optionally, the outer wall of the needle tip protective sleeve is provided with several circumferentially distributed travel blocks, and the inner wall of the outer shell is provided with a guide groove extending axially from the tail end of the outer shell, the guide groove not penetrating the head end of the outer shell.

[0017] Optionally, the needle holder is provided with a raised edge, and the inner wall of the housing is provided with a groove for limiting the raised edge.

[0018] Optionally, one end of the spring abuts against the flange, and the other end abuts against the travel block.

[0019] Optionally, the inner surface of the sliding buckle is provided with a raised ridge to reduce the gap between it and the pin seat.

[0020] Optionally, the inner wall of the housing is provided with connecting threads for connection with the insulin pen.

[0021] Optionally, the inner wall of the needle hub is provided with connecting threads for connection with the insulin pen.

[0022] Optionally, the outer surface of the needle holder is provided with raised ribs, and the needle holder and the outer shell are interference-fitted by the raised ribs.

[0023] In summary, the beneficial effects of the present invention are as follows: compared with the prior art, the front-end anti-needle-puncture insulin pen needle is designed with a telescopic needle tip protective sleeve to prevent the tip of the injection needle from being exposed after use. It adopts the principle of offsetting the sliding buckle with a single-sided spring and misaligning it with the needle seat, which limits the stroke of the needle tip protective sleeve and prevents it from retracting again after covering the needle tip. This greatly simplifies the product structure, reduces costs, and improves safety and convenience of use. Attached Figure Description

[0024] Figure 1 This is an exploded view of the front-end anti-needle-puncture insulin pen needle provided in Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the factory-made structure of the front-end anti-needle-puncture insulin pen needle provided in Embodiment 1 of the present invention;

[0026] Figure 3This is a schematic diagram of the injection structure of the front-end anti-needle-puncture insulin pen needle provided in Embodiment 1 of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the front-end anti-needle-puncture insulin pen needle after needle withdrawal provided in Embodiment 1 of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the front-end anti-needle-puncture insulin pen needle provided in Embodiment 2 of the present invention.

[0029] In the picture:

[0030] 1. Outer shell; 11. Guide groove; 12. Insert groove;

[0031] 2. Needle hub; 21. Injection needle; 22. Raised edge; 23. Raised rib;

[0032] 3. Sliding buckle; 31. Buckle part; 32. Raised ridge;

[0033] 4. Needle tip protective sleeve; 41. Spring clip; 42. Stroke block;

[0034] 5. Spring. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of this invention, 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, a mechanical connection, an electrical connection, or an indirect connection via an intermediate medium. They can also 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 invention according to the specific circumstances.

[0037] In the description of 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 being 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 being 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. The technical solutions of this invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1:

[0039] Please see Figure 1 and Figure 2 As shown, this preferred embodiment provides a front-end anti-needle-puncture insulin pen needle, including a shell 1, a needle base 2, a sliding buckle 3, and a needle tip protective sleeve 4.

[0040] The outer shell 1 is connected to the insulin pen at its tail end, and the inner wall of the outer shell 1 is provided with a connecting thread for connecting to the insulin pen; the needle holder 2 is fixed in the outer shell 1, and the needle holder 2 is provided with an injection needle 21 extending out of the head end of the outer shell 1; the sliding buckle 3 is sleeved on the needle holder 2 and slides in cooperation with the needle holder 2, and the outer surface of the sliding buckle 3 is provided with a snap-fit ​​part 31; the needle tip protective sleeve 4 is slidably disposed in the outer shell 1, and the inner wall of the needle tip protective sleeve 4 is provided with a spring piece 41 arranged on one side, and a spring 5 is sandwiched between the needle tip protective sleeve 4 and the needle holder 2.

[0041] The spring piece 41 here is integrally formed from the needle tip protective sleeve 4, is set at the tail end of the needle tip protective sleeve 4, and extends obliquely towards the head end of the needle tip protective sleeve 4. When the needle tip protective sleeve 4 moves towards the tail end, the spring piece 41 is against the inner wall of the needle tip protective sleeve 4 and does not affect the axial movement; when the needle tip protective sleeve 4 moves towards the head end, the spring piece 41 opens so as to hook the latching part 31 of the sliding buckle 3.

[0042] Specifically, there is essentially no gap between the needle holder 2 and the sliding buckle 3, while there is a gap of 0.4mm to 0.8mm between the sliding buckle 3 and the needle tip protective sleeve 4. Taking 0.5mm (50 mils) as an example, once the sliding buckle 3 comes off and the two are axially misaligned, they cannot be accurately matched again.

[0043] Furthermore, the inner surface of the sliding buckle 3 is provided with a protruding rib 32 to reduce the gap between it and the needle seat 2. The protruding rib 32 can be slightly interference-fitted with the surface of the needle seat 2, making it more difficult to re-fit after disengagement.

[0044] Based on the above structure, in the injection state, such as Figure 3 As shown, the needle tip protective sleeve 4 is retracted into the outer shell 1, the needle tip protective sleeve 4 is fitted onto the sliding buckle 3, and the spring piece 41 hooks onto the buckle part 31, so that the needle tip of the injection needle 21 is exposed.

[0045] In the needle-removed state, such as Figure 4 As shown, the needle tip protective sleeve 4 extends out of the head end of the outer shell 1 to cover the needle tip of the injection needle 21, and drives the sliding buckle 3 to disengage from the needle seat 2. Under the action of the spring piece 41, the sliding buckle 3 is misaligned with the needle seat 2, so that the end of the sliding buckle 3 abuts against the end of the needle seat 2, thereby locking the needle tip protective sleeve 4.

[0046] Furthermore, the outer wall of the needle tip protective sleeve 4 is provided with several circumferentially distributed travel blocks 42, and the inner wall of the outer shell 1 is provided with a guide groove 11 extending axially from the tail end of the outer shell 1. The guide groove 11 does not penetrate the head end of the outer shell 1, thereby ensuring that the needle tip protective sleeve 4 moves accurately axially and cannot be dislodged from the head end of the outer shell 1.

[0047] Specifically, the needle holder 2 is provided with a raised edge 22, and the inner wall of the outer casing 1 is provided with a groove 12 for limiting the raised edge 22. Furthermore, one end of the spring 5 abuts against the raised edge 22, and the other end abuts against the travel block 42 to ensure that the spring 5 is reliably installed.

[0048] When in use, as the insulin pen connects to the insulin needle, the needle is directly inserted into the body. The needle tip protector 4 retracts into the outer shell 1 against the elastic force of the spring 5, exposing the injection needle 21, thus completing the injection. After the needle is removed, the needle tip protector 4 pops out under the elastic force of the spring 5 and hooks the sliding buckle 3 and disengages from the needle seat 2 through the spring piece 41. Under the action of the spring piece 41, the sliding buckle 3 and the needle seat 2 are misaligned, limiting the axial displacement of the sliding buckle 3 and the needle tip protector 4, so that the needle tip protector 4 keeps covering the tip of the injection needle 21, achieving the purpose of preventing needle pricks.

[0049] Example 2:

[0050] Based on Embodiment 1, this embodiment provides a modified structure for a front-end anti-needle-puncture insulin pen needle. The difference is that the insulin pen is not connected to the outer shell 1, but is directly connected to the needle hub 2, thereby reducing the difficulty of engineering implementation.

[0051] Specifically, the inner wall of the needle hub 2 is provided with connecting threads for connection with the insulin pen, such as... Figure 5 As shown, the outer surface of the needle holder 2 is further provided with a raised rib 23. The needle holder 2 and the outer shell 1 are interference-fitted by the raised rib 23 to ensure reliable assembly of the overall structure, and also have the function of preventing needle puncture.

[0052] In summary, the aforementioned insulin pen needle design for preventing needle punctures addresses the issue of the injection needle 21 being exposed at the tip after use by incorporating a retractable needle tip protective sleeve 4. It utilizes a principle where a single-sided spring 41 pushes the sliding buckle 3 to offset from the needle holder 2, limiting the travel of the needle tip protective sleeve 4. This prevents the sleeve from retracting after covering the needle tip, significantly simplifying the product structure, reducing costs, and improving safety and convenience.

[0053] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A needle-punch-resistant insulin pen needle, characterized in that, include: Outer shell (1); A needle holder (2) is fixed in the outer shell (1), and an injection needle (21) extending out of the head end of the outer shell (1) is provided on the needle holder (2); A sliding buckle (3) is sleeved on the needle seat (2) and slides in cooperation with the needle seat (2). The outer surface of the sliding buckle (3) is provided with a snap-fit ​​part (31). A needle tip protective sleeve (4) is slidably disposed in the outer shell (1). A single-sided spring piece (41) is provided on the inner wall of the needle tip protective sleeve (4). A spring (5) is sandwiched between the needle tip protective sleeve (4) and the needle seat (2). In the injection state, the needle tip protective sleeve (4) is retracted into the outer shell (1), the needle tip protective sleeve (4) is fitted onto the sliding buckle (3), and the spring piece (41) hooks onto the buckle part (31), so that the needle tip of the injection needle (21) is exposed; In the needle-retracted state, the needle tip protective sleeve (4) extends out of the head end of the outer shell (1) to cover the needle tip of the injection needle (21), and drives the sliding buckle (3) to disengage from the needle seat (2). Under the action of the spring piece (41), the sliding buckle (3) is misaligned with the needle seat (2), so that the end of the sliding buckle (3) abuts against the end of the needle seat (2), thereby locking the needle tip protective sleeve (4). The spring piece (41) is located at the tail end of the needle tip protective sleeve (4) and extends obliquely toward the head end of the needle tip protective sleeve (4).

2. The anti-needle-puncture insulin pen needle according to claim 1, characterized in that, A gap of 0.4mm to 0.8mm is left between the sliding buckle (3) and the needle tip protective sleeve (4).

3. The anti-needle-puncture insulin pen needle according to claim 1, characterized in that, The outer wall of the needle tip protective sleeve (4) is provided with a number of circumferentially distributed travel blocks (42), and the inner wall of the outer shell (1) is provided with a guide groove (11) extending axially from the tail end of the outer shell (1). The guide groove (11) does not penetrate the head end of the outer shell (1).

4. The anti-needle-puncture insulin pen needle according to claim 3, characterized in that, The needle holder (2) is provided with a protruding edge (22), and the inner wall of the outer shell (1) is provided with a groove (12) for limiting the protruding edge (22).

5. The anti-needle-puncture insulin pen needle according to claim 4, characterized in that, One end of the spring (5) abuts against the convex edge (22), and the other end abuts against the travel block (42).

6. The anti-needle-puncture insulin pen needle according to claim 1, characterized in that, The inner surface of the sliding buckle (3) is provided with a protruding ridge (32) to reduce the gap between it and the pin seat (2).

7. The anti-needle-puncture insulin pen needle according to claim 1, characterized in that, The inner wall of the outer casing (1) is provided with connecting threads for connecting to an insulin pen.

8. The anti-needle-puncture insulin pen needle according to claim 1, characterized in that, The inner wall of the needle hub (2) is provided with a connecting thread for connecting to an insulin pen.

9. The anti-needle-puncture insulin pen needle according to claim 8, characterized in that, The outer surface of the needle holder (2) is provided with a raised rib (23), and the needle holder (2) and the outer shell (1) are interference-fitted by the raised rib (23).

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