Protection device for front end of insulin pen needle

Abstract

A protection device for the front end of an insulin pen needle, comprising: a housing (1); a needle hub (2), which is fixed in the housing (1), the needle hub (2) being provided with an injection needle extending out of the head end of the housing (1); a sliding fastener (3), which is sleeved on the needle hub (2) and is in sliding fit with the needle hub (2), the outer surface of the sliding fastener (3) being provided with a snap-fit portion (31); and a needle tip protective sleeve (4), which is slidably provided in the housing (1), an elastic piece (41) being provided on single side of the inner wall of the needle tip protective sleeve (4), and a spring (5) is clamped between the needle tip protective sleeve (4) and the needle hub (2). When the insulin pen needle is in an injection state, the needle tip protective sleeve (4) presses the spring (5) to retract into the housing (1), such that the needle tip protective sleeve (4) is sleeved on the sliding fastener (3), and in the case that the elastic piece (41) slides to the position of the snap-fit portion (31), the elastic piece (41) hooks the snap-fit portion (31), so as to expose the needle tip of the injection needle (21). When the insulin pen needle is in a retraction state, the needle tip protective sleeve (4) extends out of the housing (1) under the elastic force of the spring (5) and drives the sliding fastener (3) to withdraw from the needle hub (2); the sliding fastener (3) is offset with the needle hub (2) under the action of the elastic piece (41), so that an end portion of the sliding fastener (3) abuts against an end portion of the needle hub (2), and therefore the needle tip protective sleeve (4) shields the needle tip of the injection needle (21) and locks the needle tip protective sleeve (4) to prevent same from retracting into the housing (1).

Description

Insulin pen needle front end protection device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 14, 2023, with application number 202311517917.4. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of medical devices, for example, to a front end protection device for an insulin pen needle. Background Art

[0003] Insulin injection as a method of treating diabetes has been widely used. Its main function is to accurately infuse insulin into the body of diabetic patients through an injection device to achieve the purpose of controlling the patient's blood sugar.

[0004] The traditional injection form is an injection needle structure. The injection device includes a needle seat, a needle tube and an outer protective shell. After removing the protective shell before use, the insulin injection needle is directly exposed to the outside. After use, because it has no safety protection structure, it is easy to accidentally touch the needle and cause cross infection. In addition, there is a risk of reuse.

[0005] Currently, there is a type of insulin pen needle on the market that can be used as portable as a pen and takes needle protection design into consideration. However, the structure of such products is complex and varies. When protecting the front end of the needle, multiple components need to move, rotate, and other actions to cooperate to trigger. There are problems such as complex principles, high manufacturing costs, a large number of parts, cumbersome assembly, and a high failure rate. Further optimization is hoped.

[0006] Summary of the Invention

[0007] The present application provides an insulin pen needle front end protection device, which simplifies the product structure, improves the safety and convenience of use, and reduces costs.

[0008] An insulin pen needle front end protection device, comprising:

[0009] shell;

[0010] A needle holder is fixed in the housing and is provided with an injection needle with a head end extending out of the housing;

[0011] A sliding buckle is sleeved on the needle seat and slidably cooperates with the needle seat, and a buckle portion is provided on the outer surface of the sliding buckle;

[0012] The needle tip protection sleeve is slidably arranged in the housing, the inner wall of the needle tip protection sleeve is provided with a unilaterally arranged spring piece, and a spring is sandwiched between the needle tip protection sleeve and the needle seat;

[0013] When the insulin pen needle is in the injection state, the needle tip protection sleeve compresses the spring and retracts into the shell. The needle tip protection sleeve is mounted on the sliding buckle. When the spring slides to the position of the buckle, the spring hooks the buckle, exposing the needle tip of the injection needle.

[0014] When the insulin pen needle is in the withdrawn state, the needle tip protection sleeve extends out of the head end of the shell under the action of the elastic force of the spring, and drives the sliding buckle to disengage from the needle seat. The sliding buckle is dislocated from the needle seat under the action of the shrapnel, so that the end of the sliding buckle abuts against the end of the needle seat, so that the needle tip protection sleeve covers the needle tip of the injection needle and locks the needle tip protection sleeve to retract into the shell.

[0015] Optionally, the spring piece is arranged at the tail end of the needle tip protection sleeve and extends obliquely toward the head end of the needle tip protection sleeve.

[0016] Optionally, a gap of 0.4 mm to 0.8 mm is left between the sliding buckle and the needle tip protection sleeve.

[0017] Optionally, a plurality of travel blocks evenly distributed around the circumference are provided on the outer wall of the needle tip protection sleeve, and a plurality of guide grooves extending axially from the tail end of the shell are provided on the inner wall of the shell, and the guide grooves do not pass through the head end of the shell.

[0018] Optionally, a convex edge is provided on the needle seat, and an embedding groove for limiting the convex edge is provided on the inner wall of the shell.

[0019] Optionally, the first end of the spring abuts against the protrusion, and the second end of the spring abuts against the plurality of travel blocks.

[0020] Optionally, a ridge is provided on the inner surface of the sliding buckle to reduce the fitting clearance with the needle seat.

[0021] Optionally, a connecting thread configured to be connected to an insulin injection pen is provided on the inner wall of the shell.

[0022] Optionally, a connecting thread configured to connect to an insulin injection pen is provided on the inner wall of the needle seat.

[0023] Optionally, the outer surface of the needle seat is provided with ribs, and the needle seat and the shell are interference fit through the ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is an exploded view of the structure of the insulin pen needle front end protection device provided in Example 1 of the present application;

[0025] FIG2 is a schematic diagram of the structure of the insulin pen needle front end protection device provided in Example 1 of the present application when it leaves the factory;

[0026] FIG3 is a schematic diagram of the structure of the insulin pen needle front end protection device provided in Example 1 of the present application during injection;

[0027] FIG4 is a schematic diagram of the structure of the insulin pen needle front end protection device provided in Example 1 of the present application after the needle is withdrawn;

[0028] Figure 5 is a schematic structural diagram of the insulin pen needle front end protection device provided in Example 2 of the present application.

[0029] In the figure: 1. Housing; 11. Guide groove; 12. Embedded groove; 2. Needle seat; 21. Injection needle; 22. Raised edge; 23. Raised rib; 3. Sliding buckle; 31. Snap-fit ​​portion; 32. Raised ridge; 4. Needle tip protection sleeve; 41. Shrapnel; 42. Travel block; 5. Spring; 6, 7. Connecting threads. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0031] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to a fixed connection, a detachable connection, a mechanical connection, an electrical connection, an indirect connection through an intermediate medium, or internal communication between two elements or an interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0032] In the description of this application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is at a higher level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is at a lower level than the second feature. The technical solution of this application will be described below with reference to the accompanying drawings and through specific implementation methods.

[0033] Example 1:

[0034] 1 and 2 , this embodiment provides an insulin pen needle front end protection device, comprising a housing 1 , a needle seat 2 , a sliding buckle 3 and a needle tip protection sleeve 4 .

[0035] The tail end of the shell 1 is connected to the insulin injection pen, and a connecting thread 6 connected to the insulin injection pen is provided on the inner wall of the shell 1; the needle seat 2 is fixed in the shell 1, and an injection needle 21 extending from the head end of the shell 1 is provided on the needle seat 2; the sliding buckle 3 is sleeved on the needle seat 2 and slidably cooperates with the needle seat 2, and a snap portion 31 is provided on the outer surface of the sliding buckle 3; the needle tip protection sleeve 4 is slidably provided in the shell 1, and a unilaterally arranged spring piece 41 is provided on the inner wall of the needle tip protection sleeve 4, and a spring 5 is sandwiched between the needle tip protection sleeve 4 and the needle seat 2.

[0036] The spring piece 41 here is integrally formed with the needle tip protection sleeve 4, is arranged at the tail end of the needle tip protection sleeve 4, and extends obliquely toward the head end of the needle tip protection sleeve 4. When the needle tip protection sleeve 4 moves toward the tail end of the shell 1, the spring piece 41 is attached to the inner wall of the needle tip protection sleeve 4 without affecting the axial movement; when the needle tip protection sleeve 4 moves toward the head end of the shell 1, the spring piece 41 opens to hook the buckle portion 31 of the sliding buckle 3.

[0037] There is basically no gap between the needle seat 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 protection sleeve 4. Here, 0.5mm (50 wire) is taken as an example. Once the sliding buckle 3 falls out of the needle seat 2, the two will be axially misaligned, and the two cannot be accurately matched again.

[0038] The inner surface of the sliding buckle 3 is provided with a ridge 32 for reducing the clearance with the needle seat 2. The ridge 32 can have a slight interference fit with the surface of the needle seat 2, making it more difficult to re-engage after disengagement.

[0039] In the embodiment of the present application, when the insulin pen needle is in the injection state, as shown in Figure 3, the needle tip protection sleeve 4 moves toward the tail end of the shell 1, the compression spring 5 retracts into the shell 1, the needle tip protection sleeve 4 is sleeved on the sliding buckle 3, and when the spring piece 41 of the needle tip protection sleeve 4 corresponds to the position of the buckle part 31 of the sliding buckle 3, the spring piece 41 hooks the buckle part 31, and the needle tip of the injection needle 21 is exposed.

[0040] In the embodiment of the present application, when the insulin pen needle is in the withdrawn (injection completed) state, as shown in Figure 4, the needle tip protection sleeve 4 moves toward the head end of the housing 1 under the elastic force of the spring 5. Since the spring piece 41 hooks the buckle portion 31, the needle tip protection sleeve 4 drives the sliding buckle 3 to disengage from the needle seat 2. The needle tip protection sleeve 4 extending out of the head end of the housing 1 covers the needle tip of the injection needle 21. The sliding buckle 3 brought out by the unilaterally arranged spring piece 41 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 protection sleeve 4 to retract into the housing 1.

[0041] The outer wall of the needle tip protection sleeve 4 is provided with a plurality of travel blocks 42 evenly distributed around the circumference, and the inner wall of the shell 1 is provided with a plurality of guide grooves 11 extending axially from the tail end of the shell 1. The guide grooves 11 do not penetrate the head end of the shell 1, thereby ensuring that the needle tip protection sleeve 4 moves accurately axially and cannot fall out from the head end of the shell 1.

[0042] The needle seat 2 is provided with a convex edge 22, and the inner wall of the housing 1 is provided with an embedding groove 12 for limiting the convex edge 22. The first end of the spring 5 abuts against the convex edge 22, and the second end abuts against the travel block 42, ensuring that the spring 5 is reliably installed.

[0043] During use, the insulin injection pen is connected to the insulin pen needle, and the pen needle is inserted into the object, the needle tip protection sleeve 4 compresses the spring 5 and retracts into the shell 1, exposing the injection needle 21, and the injection is completed; then, the pen needle is pulled out, and the needle tip protection sleeve 4 is ejected by the elastic force of the spring 5, and hooks the sliding buckle 3 through the spring piece 41, driving the sliding buckle 3 to separate from the needle seat 2, and then under the action of the spring piece 41, the sliding buckle 3 and the needle seat 2 are axially dislocated, limiting the axial displacement of the sliding buckle 3 and the needle tip protection sleeve 4, so that the needle tip protection sleeve 4 keeps shielding the needle tip of the injection needle 21, thereby achieving the purpose of preventing needle sticks.

[0044] Example 2:

[0045] This embodiment provides a deformation structure of an insulin pen needle front end protection device. The difference from the insulin pen needle in Example 1 is that the insulin injection pen is not connected to the housing 1 but directly connected to the needle seat 2, thereby reducing the difficulty of engineering implementation.

[0046] Illustratively, a connecting thread 7 for connecting to the insulin injection pen is provided on the inner wall of the needle seat 2. As shown in FIG5 , a convex rib 23 is provided on the outer surface of the needle seat 2. The needle seat 2 and the outer shell 1 are interference fit through the convex rib 23 to ensure that the overall structure is reliably assembled and also has an anti-needle puncture function.

[0047] The front end protection device of the insulin pen needle in the embodiment of the present application is designed with a needle tip protection sleeve 4 that can perform a telescopic action, and uses a single-sided spring piece 41 to push the sliding buckle 3 to offset the sliding buckle 3 so that the sliding buckle 3 is misaligned with the needle seat 2, thereby limiting the axial travel of the needle tip protection sleeve 4 and the sliding buckle 3, so that the needle tip protection sleeve 4 cannot be retracted again after covering the needle tip, thereby greatly simplifying the product structure, reducing costs, and improving safety and convenience of use.

Claims

1. An insulin pen needle front end protection device, comprising: Housing (1); A needle seat (2) is fixed in the housing (1), and an injection needle (21) is arranged on the needle seat (2) and the head end of the injection needle extends out of the housing (1); A sliding buckle (3) is sleeved on the needle seat (2) and slidably cooperates with the needle seat (2), and a buckle portion (31) is provided on the outer surface of the sliding buckle (3); A needle tip protection sleeve (4) is slidably disposed in the housing (1), a spring sheet (41) arranged on one side is disposed on the inner wall of the needle tip protection sleeve (4), and a spring (5) is sandwiched between the needle tip protection sleeve (4) and the needle seat (2); When the insulin pen needle is in the injection state, the needle tip protection cover (4) compresses the spring (5) and retracts into the housing (1), the needle tip protection cover (4) is sleeved on the sliding buckle (3), and when the spring sheet (41) slides to the position of the buckle portion (31), the spring sheet (41) hooks the buckle portion (31), so that the needle tip of the injection needle (21) is exposed; When the insulin pen needle is in the withdrawn state, the needle tip protective cover (4) extends out of the head end of the housing (1) under the elastic force of the spring (5), and drives the sliding buckle (3) to escape from the needle seat (2). The sliding buckle (3) is displaced from the needle seat (2) under the action of the spring (41), so that the end of the sliding buckle (3) abuts against the end of the needle seat (2), so that the needle tip protective cover (4) covers the needle tip of the injection needle (21) and locks the needle tip protective cover (4) to be retracted into the housing (1).

2. The insulin pen needle front end protection device according to claim 1, wherein: The spring sheet (41) is arranged at the rear end of the needle tip protection sleeve (4) and extends obliquely toward the head end of the needle tip protection sleeve (4).

3. The insulin pen needle front end protection device according to claim 1, wherein: A gap of 0.4 mm to 0.8 mm is left between the sliding buckle (3) and the needle tip protection sleeve (4).

4. The insulin pen needle front end protection device according to claim 1, wherein: The outer wall of the needle tip protection sleeve (4) is provided with a plurality of travel blocks (42) evenly distributed around the circumference, and the inner wall of the outer shell (1) is provided with a plurality of guide grooves (11) extending axially from the rear end of the outer shell (1), and the guide grooves (11) do not penetrate the head end of the outer shell (1).

5. The insulin pen needle front end protection device according to claim 4, wherein: The needle seat (2) is provided with a convex edge (22), and the inner wall of the housing (1) is provided with an embedding groove (12) for limiting the convex edge (22).

6. The insulin pen needle front end protection device according to claim 5, wherein: The first end of the spring (5) abuts against the protruding edge (22), and the second end abuts against the plurality of travel blocks (42).

7. The insulin pen needle front end protection device according to claim 1, wherein: The inner surface of the sliding buckle (3) is provided with a convex ridge (32) for reducing the matching clearance with the needle seat (2).

8. The insulin pen needle front end protection device according to claim 1, wherein: The inner wall of the housing (1) is provided with a connecting thread (6) configured to be connected to an insulin injection pen.

9. The insulin pen needle front end protection device according to claim 1, wherein: The inner wall of the needle seat (2) is provided with a connecting thread (7) configured to be connected to an insulin injection pen.

10. The insulin pen needle front end protection device according to claim 9, wherein: The outer surface of the needle seat (2) is provided with a convex rib (23), and the needle seat (2) and the housing (1) are interference-fitted via the convex rib (23).

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