Insulin pen needle rear end protection device

Abstract

Provided is an insulin pen needle rear end protection device, which comprises: a housing (1), wherein the tail end of the housing (1) is arranged to be connected with an insulin injection pen; a needle holder (2) fixed in the housing (1), wherein an injection needle extending to the tail end of the housing (1) is arranged on the needle holder (2), a guide groove (22) is formed in the side wall of the needle holder (2), and a protruding block (23) is further arranged on the inner surface of the side wall of the needle holder (2); and a rear needle protective sleeve (3) arranged in the needle holder (2) in a penetrating manner, wherein a spring (4) is clamped between the rear needle protective sleeve (3) and the needle holder (2), and a positioning column (31) and an elastic clamping jaw (32) are arranged on the outer surface of the rear needle protective sleeve (3). When the insulin pen needle is connected to the injection pen, the rear needle protective sleeve (3) is compressed into the needle holder (2), the positioning column (31) moves in the guide groove (22) to a first position, and the elastic clamping jaw (32) is located on the side of the protruding block (23) away from the tail end of the needle holder (2); when the insulin pen needle is separated from the injection pen, the positioning column (31) moves to a second position along the guide groove (22) under the acting force of the spring (4), such that the rear needle protective sleeve (3) pops up, and the elastic clamping jaw (32) crosses the protruding block (23) and is limited by one side of the protruding block (23) proximal to the tail end of the needle holder (2), thus covering the tail end of the injection needle (21) while locking the rear needle protective sleeve (3).

Description

Insulin pen needle rear 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 202311523354.X. 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 rear 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] There is another type of insulin pen needle that is installed at the head end of the injection pen. It is easy to carry and use, and the front end protection design of the needle is taken into consideration. However, most of these products ignore the protection of the rear end of the injection needle. After the pen needle is separated from the injection pen, the needle tail of the injection needle 21 will be exposed, as shown in Figure 1, and there is also a risk of needle stick.

[0006] Summary of the Invention

[0007] The present application provides a rear end protection device for an insulin pen needle, which is designed to protect the exposed rear end of the injection needle to improve safety and convenience of use.

[0008] The present application provides an insulin pen needle rear end protection device, comprising:

[0009] a housing, wherein the rear end of the housing is configured to be connected to an insulin injection pen;

[0010] A needle holder is fixed in the housing, and an injection needle extending to the tail end of the housing is provided on the needle holder. A guide groove is provided on the side wall of the needle holder, and a protrusion is provided on the inner surface of the side wall of the needle holder;

[0011] The rear needle protection sleeve is inserted into the needle seat, and a spring is sandwiched between the rear needle protection sleeve and the needle seat. The outer surface of the rear needle protection sleeve is provided with a positioning column and an elastic claw;

[0012] When the insulin pen needle is connected to the insulin injection pen, the rear needle protection sleeve is compressed into the needle seat, the positioning column moves to the first position in the guide groove, and the elastic claw is located on the side of the protrusion away from the rear end of the needle seat;

[0013] When the insulin pen needle is separated from the insulin injection pen, the positioning column moves to the second position along the guide groove under the action of the spring, so that the rear needle protection cover pops out, and the elastic claw passes over the protrusion and is limited by the side of the protrusion close to the tail end of the needle seat, thereby covering the tail of the injection needle and locking the rear needle protection cover.

[0014] Optionally, the guide groove includes a first guide section extending obliquely from the middle of the needle seat toward the head end of the needle seat and a second guide section arranged axially along the needle seat, the first guide section intersects with the second guide section, the first position is the end of the second guide section close to the head end of the needle seat, and the second position is the end of the second guide section close to the tail end of the needle seat.

[0015] Optionally, the size of the notch at the intersection of the first guide segment and the second guide segment is smaller than the size of the positioning post, and the positioning post passes through the notch due to elastic deformation of the notch.

[0016] Optionally, an assembly guide groove extending from the tail end of the needle seat to the first guide section is provided on the inner wall of the needle seat.

[0017] Optionally, the rear needle protection sleeve includes a core column and an outer wall located outside the core column, the spring is arranged in the gap between the core column and the outer wall, and the positioning column and the elastic claw are respectively formed on the outer wall.

[0018] Optionally, two notches are provided on the outer wall along the axial direction and spaced apart, and the portion between the two notches forms an elastic claw, the free end of the elastic claw extends toward the end face of the outer wall and protrudes from the outer surface of the outer wall.

[0019] Optionally, there are two positioning posts and two elastic claws; the two positioning posts are arranged opposite to each other on the outer wall, and the two elastic claws are arranged opposite to each other on the outer wall; the two positioning posts and the two elastic claws are distributed in a cross shape on the cross section of the rear needle protection sleeve.

[0020] Optionally, an avoidance opening is provided on the needle seat relative to the moving track of the elastic clamping claw during the connection between the insulin pen needle and the insulin injection pen.

[0021] Optionally, the first side edge of the protrusion is provided with a transition slope for facilitating the elastic claw to pass over, and the second side edge of the protrusion is provided with a limiting step for preventing the elastic claw from passing over.

[0022] Optionally, a ridge is provided on the outer surface of the rear needle protection sleeve to reduce the fitting clearance with the needle seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of an insulin pen needle with the needle tail exposed in the related art;

[0024] FIG2 is an exploded view of the structure of the insulin pen needle rear end protection device provided in an embodiment of the present application;

[0025] FIG3 is a first structural diagram of a needle holder in a rear end protection device for an insulin pen needle provided in an embodiment of the present application;

[0026] FIG4 is a second structural diagram of a needle holder in a rear end protection device for an insulin pen needle provided in an embodiment of the present application;

[0027] FIG5 is a schematic structural diagram of a rear needle protection sleeve in a rear end protection device for an insulin pen needle provided in an embodiment of the present application;

[0028] FIG6 is a schematic diagram of the structure of the rear end protection device of the insulin pen needle provided in an embodiment of the present application at the time of delivery;

[0029] FIG7 is a schematic diagram of the structure of the insulin pen needle rear end protection device during injection provided by an embodiment of the present application;

[0030] FIG8 is a schematic diagram of the structure of the insulin pen needle rear end protection device after needle withdrawal provided in an embodiment of the present application.

[0031] In the figure: 1. Housing; 2. Needle seat; 21. Injection needle; 22. Guide groove; 221. First guide section; 222. Second guide section; 23. Protrusion; 231. Transition slope; 232. Limiting step; 24. Assembly guide groove; 25. Avoidance; 3. Rear needle protection sleeve; 31. Positioning column; 32. Elastic claw; 33. Core column; 34. Outer wall; 35. Notch groove; 36. Raised ridge; 4. Spring. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Please refer to Figures 2 to 8 , this embodiment provides an insulin pen needle rear end protection device, including a housing 1 , a needle seat 2 and a rear needle protection sleeve 3 .

[0036] The tail end of the shell 1 is connected to the insulin injection pen; the needle seat 2 is fixed in the shell 1, and an injection needle 21 extending to the tail end of the shell 1 is provided on the needle seat 2, and a guide groove 22 is provided on the side wall of the needle seat 2, and a protrusion 23 is also provided on the inner surface of the side wall of the needle seat 2; the rear needle protection sleeve 3 is passed through the needle seat 2, and a spring 4 is clamped between the rear needle protection sleeve 3 and the needle seat 2, and the outer surface of the rear needle protection sleeve 3 is provided with a positioning column 31 and an elastic claw 32.

[0037] When the insulin pen needle is connected to the insulin injection pen, the rear needle protection sleeve 3 is compressed into the needle seat 2, the positioning column 31 moves to the first position in the guide groove 22, and the elastic claw 32 is located on the side of the protrusion 23 away from the tail end of the needle seat 2; when the insulin pen needle is separated from the insulin injection pen, the positioning column 31 continues to move to the second position along the guide groove 22 under the action of the spring 4, so that the rear needle protection sleeve 3 pops out, and the elastic claw 32 passes over the protrusion 23 and is limited by the side of the protrusion 23 close to the tail end of the needle seat 2, thereby covering the tail of the injection needle 21 while locking the rear needle protection sleeve 3.

[0038] The guide groove 22 includes a first guide section 221 extending obliquely from the middle of the needle seat 2 toward the head end of the needle seat 2 and a second guide section 222 arranged along the axial direction of the needle seat 2. The first guide section 221 intersects with the second guide section 222. The first position is the end of the second guide section 222 close to the head end of the needle seat 2, and the second position is the end of the second guide section 222 close to the tail end of the needle seat 2.

[0039] During connection of the insulin pen needle to the injection pen, the positioning post 31 moves from the first guide segment 221 to the first position of the second guide segment 222, and the rear needle shield 3 undergoes both axial and rotational movement relative to the needle hub 2. During separation of the insulin pen needle from the injection pen, the positioning post 31 moves from the first position of the second guide segment 222 to the second position, and the rear needle shield 3 moves only axially relative to the needle hub 2. Furthermore, the ends of the second guide segment 222 do not penetrate the end surface of the needle hub 2, preventing the positioning post 31 from dislodging from the second guide segment 222 and improving structural reliability.

[0040] The size of the notch at the intersection of the first guide section 221 and the second guide section 222 is smaller than the size of the positioning post 31. The notch can be elastically deformed to allow the positioning post 31 to pass through. The advantage of this design is that the positioning post 31 can easily pass through the intersection during the process from the first guide section 221 to the second guide section 222, and the positioning post 31 is not likely to return to the first guide section 221 by mistake during the process from the first position to the second position.

[0041] An assembly guide groove 24 extending from the rear end of the needle seat 2 to the first guide section 221 is provided on the inner wall of the needle seat 2 to facilitate the positioning post 31 to reach the initial position of the first guide section 221 during factory assembly.

[0042] The rear needle protection sleeve 3 here includes a core column 33 and an outer wall 34 located outside the core column 33 , a spring 4 is arranged in the gap between the core column 33 and the outer wall 34 , and a positioning column 31 and an elastic claw 32 are respectively formed on the outer wall 34 .

[0043] The outer wall 34 is provided with two axially spaced notches 35 , and the portion between the two notches 35 forms an elastic claw 32 . The free end of the elastic claw 32 extends toward the end face of the outer wall 34 and protrudes from the outer surface of the outer wall 34 .

[0044] In order to ensure that the rear needle guard 3 moves accurately relative to the needle seat 2, two positioning posts 31 and two elastic claws 32 are provided on the rear needle guard 3. The two positioning posts 31 are arranged opposite to each other on the outer wall 34, and the two elastic claws 32 are arranged opposite to each other on the outer wall 34. The two positioning posts 31 and the two elastic claws 32 are distributed in a cross shape on the cross section of the rear needle guard 3.

[0045] An escape opening 25 is provided on the needle seat 2 corresponding to the movement trajectory of the elastic claw 32 during the connection between the insulin pen needle and the injection pen, ensuring that the rear needle protection sleeve 3 rotates and moves smoothly and can reduce weight.

[0046] The first side edge of the projection 23 is provided with a transition bevel 231 to facilitate the passage of the elastic claw 32, and the second side edge of the projection 23 is provided with a stop step 232 to prevent the elastic claw 32 from passing over. During the separation of the insulin pen needle from the injection pen, the rear needle guard 3 only moves axially, that is, the elastic claw 32 only moves from one axial side of the projection 23 to the other axial side. The transition bevel 231 and stop step 232 ensure that the elastic claw 32 can move accurately.

[0047] In addition, a ridge 36 is provided on the outer surface of the rear needle protection sleeve 3 to reduce the matching clearance with the needle seat 2 .

[0048] In the initial state, the positioning post 31 is located in the first guide section 221 of the guide groove 22 , as shown in FIG. 6 .

[0049] During use, as the insulin injection pen is connected to the tail end of the insulin pen needle, the rear needle protection sleeve 3 is pressed, thereby overcoming the elastic force of the spring 4 and, under the limiting action of the guide groove 22 on the positioning column 31, moving and rotating the positioning column 31 to reach the first position. At this time, the elastic claw 32 is located on one side of the axial direction of the protrusion 23, as shown in Figure 7 for details.

[0050] After the injection is completed, the insulin injection pen is separated from the insulin pen needle, and the rear needle protection sleeve 3 is popped out by the elastic force of the spring 4. Under the limiting action of the positioning column 31 by the guide groove 22, the rear needle protection sleeve 3 moves axially to move the positioning column 31 to the second position. At this time, the elastic claw 32 passes over the protrusion 23 to reach the other axial side of the protrusion 23, and limits the axial displacement of the rear needle protection sleeve 3, so that the rear needle protection sleeve 3 keeps covering the needle tail of the injection needle 21, thereby achieving the purpose of needlestick prevention, see Figure 8 for details.

[0051] The above-mentioned insulin pen needle rear end protection device is designed with a rear needle protection sleeve 3 with a telescopic action. According to the action of the pen needle being connected and separated from the injection pen, the rear needle protection sleeve 3 is triggered to pop out and form a position lock, so that the rear needle protection sleeve 3 cannot be retracted again after covering the needle tail, thereby achieving the purpose of preventing needle sticks at the rear end and improving the safety of use.

Claims

1. A rear end protection device for an insulin pen needle, comprising: A housing (1), wherein the rear end of the housing (1) is configured to be connected to an insulin injection pen; A needle seat (2) is fixed in the housing (1), the needle seat (2) is provided with an injection needle (21) extending to the rear end of the housing (1), a guide groove (22) is provided on the side wall of the needle seat (2), and a protrusion (23) is also provided on the inner surface of the side wall of the needle seat (2); A rear needle protection sleeve (3) is inserted into the needle seat (2), and a spring (4) is sandwiched between the rear needle protection sleeve (3) and the needle seat (2). A positioning column (31) and an elastic claw (32) are provided on the outer surface of the rear needle protection sleeve (3); When the insulin pen needle is connected to the insulin injection pen, the rear needle protection sleeve (3) is compressed into the needle seat (2), the positioning column (31) moves to a first position in the guide groove (22), and the elastic claw (32) is located on a side of the protrusion (23) away from the rear end of the needle seat (2); When the insulin pen needle is separated from the insulin injection pen, the positioning column (31) moves to the second position along the guide groove (22) under the action of the spring (4), so that the rear needle protection sleeve (3) pops out, and the elastic claw (32) passes over the protrusion (23) and is limited by the side of the protrusion (23) close to the tail end of the needle seat (2), thereby covering the tail of the injection needle (21) and locking the rear needle protection sleeve (3) at the same time.

2. The insulin pen needle rear end protection device according to claim 1, wherein: The guide groove (22) comprises a first guide section (221) extending obliquely from the middle of the needle seat (2) toward the head end of the needle seat (2) and a second guide section (222) arranged along the axial direction of the needle seat (2), the first guide section (221) intersects with the second guide section (222), the first position is the end of the second guide section (222) close to the head end of the needle seat (2), and the second position is the end of the second guide section (222) close to the tail end of the needle seat (2).

3. The insulin pen needle rear end protection device according to claim 2, wherein: The size of the notch at the intersection of the first guide section (221) and the second guide section (222) is smaller than the size of the positioning column (31), and the positioning column (31) passes through the notch due to elastic deformation of the notch.

4. The insulin pen needle rear end protection device according to claim 2, wherein: An assembly guide groove (24) extending from the rear end of the needle seat (2) to the first guide section (221) is provided on the inner wall of the needle seat (2).

5. The insulin pen needle rear end protection device according to claim 1, wherein: The rear needle protection sleeve (3) comprises a core column (33) and an outer wall (34) located outside the core column (33), the spring (4) is arranged in the gap between the core column (33) and the outer wall (34), and the positioning column (31) and the elastic claw (32) are respectively formed on the outer wall (34).

6. The insulin pen needle rear end protection device according to claim 5, wherein: The outer wall (34) is provided with two notched grooves (35) spaced apart along the axial direction, the portion between the two notched grooves (35) forms the elastic claw (32), and the free end of the elastic claw (32) extends toward the end face of the outer wall (34) and protrudes from the outer surface of the outer wall (34).

7. The insulin pen needle rear end protection device according to claim 1, wherein: The number of the positioning posts (31) and the number of the elastic claws (32) are both two; The two positioning columns (31) are arranged opposite to each other on the outer wall (34), and the two elastic claws (32) are arranged opposite to each other on the outer wall (34); the two positioning columns (31) and the two elastic claws (32) are distributed in a cross shape on the cross section of the rear needle protection sleeve (3).

8. The insulin pen needle rear end protection device according to claim 1, wherein: The needle seat (2) is provided with an avoidance opening (25) relative to the moving track of the elastic clamping claw (32) during the process of connecting the insulin pen needle with the insulin injection pen.

9. The insulin pen needle rear end protection device according to claim 1, wherein: The first side edge of the protrusion (23) is provided with a transition slope (231) that facilitates the elastic claw (32) to pass over, and the second side edge of the protrusion (23) is provided with a limiting step (232) that blocks the elastic claw (32) from passing over.

10. The insulin pen needle rear end protection device according to claim 1, wherein: The outer surface of the rear needle protection sleeve (3) is provided with a convex ridge (36) for reducing the matching clearance with the needle seat (2).

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