A needle shield assembly and injection device

Abstract

The application provides an injection needle lower end shielding device and an injection equipment, and relates to the technical field of injection equipment. The injection needle lower end shielding device makes the shielding cylinder in the needle seat move upward by the pushing force given by the connection of the insulin pen and the needle seat during the installation of the needle seat on the insulin pen. After the installation of the needle seat on the insulin pen is completed, the limiting of the shielding cylinder in the needle seat is released. After the injection of the medicine is completed, the injection needle is removed from the insulin pen, the insulin pen is separated from the shielding cylinder, the limiting block moves downward along the moving groove, drives the shielding cylinder to move downward, and gradually covers the lower end of the injection needle. When the injection needle is completely removed from the insulin pen, the limiting block also moves downward to abut against the bottom wall of the moving groove, the shielding cylinder completely covers the lower end of the injection needle, and the situation that the user is pricked by mistake due to the contact with the lower end of the injection needle is avoided, so that the safety risk of the lower end of the injection needle during the disassembly is avoided.

Description

Technical Field

[0001] This invention relates to the field of injection device technology, and more specifically, to a shielding device for the lower end of an injection needle and an injection device. Background Technology

[0002] Diabetes is becoming an epidemic and a growing global threat. Currently, controlling blood sugar levels in diabetic patients is mainly achieved through insulin injections. Insulin injections are performed using specialized injection devices. These devices are equipped with needles; the upper end of the needle dispenses the medication, while the lower end receives it.

[0003] Therefore, in order to ensure a stable delivery of medication, the lower end of the injection needle is relatively sharp and can pierce into the pre-filled vial of the injection device. However, while the sharp lower end meets the need for needle insertion, it also poses a safety hazard when disassembling the injection needle, as the sharp lower end can easily injure the user. Summary of the Invention

[0004] The problem addressed by this invention is how to avoid the safety risks associated with disassembling the lower end of the injection needle.

[0005] To address the above problems, the present invention provides a shielding device for the lower end of an injection needle, comprising:

[0006] A needle holder is used to mount an injection needle of an injection device and to mount it on an insulin pen of the injection device. The inner wall of the needle holder is provided with a moving groove, a limiting groove and a first guide slope. The moving groove extends along the axial direction of the needle holder. The limiting groove is located on the upper side of the moving groove. The limiting groove is connected to the moving groove through the first guide slope. The end of the first guide slope connected to the limiting groove is higher than the end of the first guide slope connected to the moving groove.

[0007] A shielding cylinder is installed inside the needle holder and through which the injection needle passes. The side wall of the shielding cylinder is provided with a limiting block for placement in the limiting groove. The limiting block is located below the first guide slope. When the needle holder is installed on the insulin pen, the shielding cylinder abuts against the insulin pen and moves upward, so that the limiting block in the limiting groove enters the moving groove along the first guide slope. When the needle holder is separated from the insulin pen, the limiting block moves downward along the moving groove, so that the shielding cylinder covers and shields the lower end of the injection needle.

[0008] Compared to existing technologies, the beneficial effects of the lower end shielding device for injection needles of the present invention include: The needle holder serves as the mounting structure for the injection needle of the injection device. The needle holder can be mounted on an insulin pen, allowing the lower end of the injection needle to penetrate the pre-filled vial of the insulin pen, facilitating the injection of the medication. A shielding cylinder is installed inside the needle holder, allowing the injection needle to pass through and preventing interference during needle installation and normal use. Furthermore, a limiting groove is provided on the inner wall of the needle holder, and a limiting block is provided on the side wall of the shielding cylinder. When the shielding cylinder is in its initial position, the limiting block is located within the limiting groove, and the limiting groove limits the limiting block, preventing it from moving up and down, thus ensuring the stability of the shielding cylinder in its initial position. Simultaneously, a moving groove is also provided on the inner wall of the needle holder, extending axially along the needle holder. The limiting groove is located on the upper side of the moving groove and communicates with it via a first guide slope, wherein the first guide slope connects to the limiting groove. One end of the needle is higher than the end connected to the first guide slope and the moving groove, and the limiting block is located below the first guide slope. With this configuration, when the insulin pen needs to be injected, during the installation of the needle holder, the lower end of the shielding tube inside the needle holder first abuts against the insulin pen. The lower end of the injection needle punctures into the pre-filled vial of the insulin pen. As the length of the injection needle inserted into the vial increases, the shielding tube also moves upward under the thrust provided by the insulin pen. The upward movement of the shielding tube causes the limiting block to move upward, and the limiting block is located below the first guide slope. Below the surface, the limiting block moves upward to abut against the first guide slope. As the shielding cylinder continues to move upward, the limiting block moves along the first guide slope, causing the shielding cylinder to rotate circumferentially along the needle holder. After the needle holder is installed on the insulin pen, the limiting block finally enters the moving groove from the limiting groove and remains stable vertically under the limiting of the insulin pen and the top wall of the moving groove. At this time, the insulin pen can normally drive the medication through the injection needle to complete the injection. After the medication is injected, the injection needle needs to be removed from the insulin pen. The insulin pen and the shielding cylinder separate, and the lower limiting of the shielding cylinder disappears. At this time, the limiting block can be driven to move downward along the moving groove, causing the shielding cylinder to move downward and gradually cover the lower end of the injection needle. When the injection needle is completely removed from the insulin pen, the limiting block also moves downward to abut against the bottom wall of the moving groove. The shielding cylinder moves to its limit position and completely covers the lower end of the injection needle, preventing the user from accidentally touching the lower end of the injection needle and being pricked, thus avoiding the safety risks that exist when disassembling the lower end of the injection needle.

[0009] Optionally, the needle holder is a hollow structure with an open bottom, and the shielding cylinder is slidably installed inside the needle holder through the open end of the needle holder. A spring is provided between the inner top wall of the needle holder and the shielding cylinder. When the limiting block is located in the limiting groove, the spring is in a compressed state.

[0010] Optionally, the shielding cylinder has a boss on its side wall, and a second guide slope is provided on the upper surface of the boss. The needle seat has a downward-opening placement groove at the edge of its open end, and a third guide slope is provided on the inner top wall of the placement groove. The second guide slope, the third guide slope, and the first guide slope all extend circumferentially along the needle seat and have the same inclination direction and inclination angle. When the limiting block is located in the limiting groove, the boss is located below the needle seat. When the limiting block enters the moving groove from the limiting groove, the boss is placed in the placement groove, and the second guide slope and the third guide slope abut against each other.

[0011] Optionally, the limiting block has a fourth guide slope on the side away from the moving groove, and a fifth guide slope is provided at the connection between the moving groove and the limiting groove. The lower end of the fifth guide slope is closer to the moving groove than the upper end. The fourth guide slope is parallel to the fifth guide slope. When the limiting block moves down along the moving groove and passes through the connection between the moving groove and the limiting groove, the fourth guide slope is used to abut against the fifth guide slope.

[0012] Optionally, the inner wall of the needle holder is further provided with a transition groove extending axially. The transition groove is located above the moving groove and communicates with the moving groove. When the needle holder is installed on the insulin pen, the limiting block is located in the transition groove.

[0013] Optionally, the inner wall of the needle holder is further provided with a receiving groove, the middle section of the moving groove is connected to the receiving groove, and an elastic rod is provided between the moving groove and the receiving groove. The elastic rod is inclined toward the moving groove and is used to swing back and forth between the moving groove and the receiving groove.

[0014] Optionally, the lower end of the elastic rod is inclined toward the moving groove, and the distance between the lower end of the elastic rod and the side wall of the moving groove away from the receiving groove is less than the width of the limiting block.

[0015] Optionally, the needle holder is provided with a mounting post, which is located on the inner top wall of the needle holder. The spring and the shielding cylinder are both sleeved on the mounting post, and the mounting post is used to install the injection needle through it.

[0016] Optionally, the lower end shielding device of the injection needle further includes a connecting seat, which is a hollow structure with openings at both the top and bottom. The needle seat and the connecting seat are connected vertically. The lower end of the shielding cylinder is located inside the connecting seat. The inner wall of the connecting seat is provided with threads. The connecting seat is used to connect to the insulin pen through the threads, so that the insulin pen abuts against the shielding cylinder and drives the shielding cylinder to move upward.

[0017] On the other hand, the present invention also provides an injection device, including an injection needle, an insulin pen, and a lower end shielding device for the injection needle as described above.

[0018] Compared to the prior art, the beneficial effects of the injection device of the present invention are the same as those of the injection needle lower end shielding device described above, and will not be repeated here. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the internal structure of the lower end shielding device of the injection needle before shielding in an embodiment of the present invention;

[0020] Figure 2 This is an exploded view of the shielding device at the lower end of the injection needle in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the shielding device at the lower end of the injection needle after shielding, as described in an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Needle base; 11-Moving groove; 111-Fifth guide slope; 12-Limiting groove; 13-First guide slope; 14-Placement groove; 141-Third guide slope; 15-Transition groove; 16-Mounting post; 17-Accommodation groove; 171-Elastic rod; 2-Injection needle; 3-Shielding cylinder; 31-Limiting block; 311-Fourth guide slope; 32-Boss; 321-Second guide slope; 4-Spring; 5-Connecting seat. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] It should be noted that in the XYZ coordinate system provided herein, the positive direction of the X-axis represents the right, and the negative direction of the X-axis represents the left; the positive direction of the Y-axis represents the front, and the negative direction of the Y-axis represents the back; the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom. Furthermore, it should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein.

[0026] On one hand, one embodiment of the present invention provides a lower end shielding device for an injection needle, comprising: a needle holder 1, the needle holder 1 being used to mount an injection needle 2 of an injection device and mounted on an insulin pen of the injection device; the inner wall of the needle holder 1 is provided with a moving groove 11, a limiting groove 12, and a first guide slope 13; the moving groove 11 extends axially along the needle holder 1; the limiting groove 12 is located on one side of the upper end of the moving groove 11; the limiting groove 12 is connected to the moving groove 11 through the first guide slope 13; one end of the first guide slope 13 connected to the limiting groove 12 is higher than the first guide slope 13 and the moving groove. 11 is connected to one end; a shielding cylinder 3 is installed inside the needle holder 1 and is passed through by the injection needle 2. The side wall of the shielding cylinder 3 is provided with a limiting block 31 for being placed in the limiting groove 12. The limiting block 31 is located below the first guide slope 13. When the needle holder 1 is installed on the insulin pen, the shielding cylinder 3 abuts against the insulin pen and moves upward so that the limiting block 31 in the limiting groove 12 enters the moving groove 11 along the first guide slope 13. When the needle holder 1 is separated from the insulin pen, the limiting block 31 moves downward along the moving groove 11 so that the shielding cylinder 3 covers and shields the lower end of the injection needle 2.

[0027] It should be noted that, in the embodiments of the present invention, for the injection device and each structural component in the injection device, the upper end is the end that is close to the skin when the injection device is used, and the lower end is the end that is far away from the skin when the injection device is used.

[0028] In this embodiment, as Figure 1 and Figure 2As shown, the needle holder 1 serves as the mounting structure for the injection needle 2 of the injection device. The needle holder 1 can be mounted on an insulin pen, allowing the lower end of the injection needle 2 to penetrate the pre-filled vial of the insulin pen, facilitating the injection of the medication. A shielding cylinder 3 is installed inside the needle holder 1, allowing the injection needle 2 to pass through and preventing interference during installation and normal use. Furthermore, a limiting groove 12 is provided on the inner wall of the needle holder 1, and a limiting block 31 is provided on the side wall of the shielding cylinder 3. When the shielding cylinder 3 is in its initial position, the limiting block 31 is located within the limiting groove 12, which limits the limiting block 31, preventing it from moving up and down and ensuring the stability of the shielding cylinder 3 in its initial position. Simultaneously, a moving groove 11 is also provided on the inner wall of the needle holder 1, extending axially along the needle holder 1. The limiting groove 12 is located on the upper side of the moving groove 11 and is connected via... The first guide slope 13 is connected to the moving groove 11. One end of the first guide slope 13 connected to the limiting groove 12 is higher than the other end connected to the moving groove 11. The limiting block 31 is located below the first guide slope 13. With this configuration, when medication injection is required, during the installation of the needle holder 1 into the insulin pen, the lower end of the shielding cylinder 3 inside the needle holder 1 first abuts against the insulin pen, and the lower end of the injection needle 2 punctures into the pre-filled vial of the insulin pen. As the injection needle 2 penetrates the vial... As the insulin pen exerts its force, the shielding cylinder 3 moves upward, causing the limiting block 31 to move upward as well. The limiting block 31, located below the first guide slope 13, moves upward until it abuts against the first guide slope 13. As the shielding cylinder 3 continues to move upward, the limiting block 31 moves along the first guide slope 13, causing the shielding cylinder 3 to rotate circumferentially along the needle holder 1. After the needle holder 1 is installed in the insulin pen, the limiting block 31 finally enters the moving groove 11 from the limiting groove 12. The insulin pen remains stable vertically under the limiting position of the upper wall of the moving groove 11. At this time, the insulin pen can normally drive the medication through the injection needle 2 to complete the injection. After the medication is injected, the injection needle 2 needs to be removed from the insulin pen. The insulin pen separates from the shielding cylinder 3, and the lower limiting position of the shielding cylinder 3 disappears. At this time, the limiting block 31 can be driven to move downwards along the moving groove 11, causing the shielding cylinder 3 to move downwards, gradually covering the lower end of the injection needle 2. When the injection needle 2 is completely removed from the insulin pen, as... Figure 3 As shown, the limiting block 31 also moves downward to abut against the bottom wall of the moving groove 11, and the shielding cylinder 3 moves down to the extreme position and completely covers the lower end of the shielding injection needle 2, so as to avoid the user accidentally touching the lower end of the injection needle 2 and being punctured, thereby avoiding the safety risks that exist when the lower end of the injection needle is disassembled.

[0029] Optionally, the needle holder 1 is a hollow structure with an open bottom. The shielding cylinder 3 is slidably installed inside the needle holder 1 through the open end of the needle holder 1. A spring 4 is provided between the inner top wall of the needle holder 1 and the shielding cylinder 3. When the limiting block 31 is located in the limiting groove 12, the spring 4 is in a compressed state.

[0030] To improve the stability of the shielding cylinder 3 when covering and shielding the lower end of the injection needle 2, in this embodiment, as follows: Figure 1 and Figure 2 As shown, the needle holder 1 is configured as a hollow structure with an open lower end. The shielding cylinder 3 can be slidably installed inside the needle holder 1 through the open end of the needle holder 1. A spring 4 is set between the inner top wall of the needle holder 1 and the shielding cylinder 3. When the limiting block 31 is located in the limiting groove 12, that is, when the shielding cylinder 3 is in the initial position, the spring 4 is in a compressed state. With this configuration, when the needle holder 1 is installed on the insulin pen, that is, when the lower end of the injection needle 2 punctures into the pre-filled insulin solution vial of the insulin pen, the insulin pen abuts against the lower end of the shielding cylinder 3, driving the shielding cylinder 3 to move upward, and the spring 4 is further compressed. At the same time, the limiting block 31 moves from the limiting groove 12 into the moving groove 11. After the injection is completed, the injection needle 2 is pulled out of the insulin pen, the pressure on the spring 4 disappears, and the spring 4 relaxes. Due to the supporting effect of the inner top wall of the needle holder 1, the spring 4 provides an elastic driving force to the shielding cylinder 3, driving the shielding cylinder 3 to move downward to cover the lower end of the shielding injection needle 2. During this process, the limiting block 31 moves synchronously along the moving groove 11. Figure 3 As shown, when the limiting block 31 abuts against the bottom wall of the moving groove 11, it indicates that the shielding cylinder 3 has covered the lower end of the injection needle 2. Due to the limiting block 31 being restricted by the bottom wall of the moving groove 11, the shielding cylinder 3 will not continue to move downwards and detach from the needle holder 1, ensuring the stability of the shielding cylinder 3 when covering the lower end of the injection needle 2. In addition, after the shielding cylinder 3 covers the lower end of the injection needle 2, the spring 4 can still be in a compressed state, continuously providing downward pressure to the shielding cylinder 3, preventing the user from accidentally touching the shielding cylinder 3 and giving it an upward thrust that would expose the lower end of the injection needle 2, resulting in accidental puncture, thereby further avoiding the safety risks that exist when disassembling the lower end of the injection needle.

[0031] Optionally, a boss 32 is provided on the side wall of the shielding cylinder 3, and a second guide slope 321 is provided on the upper end surface of the boss 32. The opening edge of the needle seat 1 is provided with a downward opening placement groove 14, and a third guide slope 141 is provided on the inner top wall of the placement groove 14. The second guide slope 321, the third guide slope 141 and the first guide slope 13 all extend along the circumference of the needle seat 1 and have the same inclination direction and inclination angle. When the limiting block 31 is located in the limiting groove 12, the boss 32 is located below the needle seat 1. When the limiting block 31 enters the moving groove 11 from the limiting groove 12, the boss 32 is placed in the placement groove 14, and the second guide slope 321 and the third guide slope 141 abut against each other.

[0032] To ensure stability during the upward movement of the shielding cylinder 3, in this embodiment, as follows: Figure 1 and Figure 2 As shown, a boss 32 is provided on the side wall of the shielding cylinder 3, and a second guide slope 321 is provided on the boss 32. A downward-opening placement groove 14 is provided on the edge of the opening end of the needle seat 1. A third guide slope 141 is provided on the inner top wall of the placement groove 14. The second guide slope 321, the third guide slope 141 and the first guide slope 13 all extend along the circumference of the needle seat 1 and have the same inclination direction and inclination angle. When the limiting block 31 is located in the limiting groove 12, the boss 32 is located below the needle seat 1. When the limiting block 31 enters the moving groove 11 from the limiting groove 12, the boss 32 is placed in the placement groove 14, and the second guide slope 321 and the third guide slope 141 are in contact with each other. With this configuration, when the shielding cylinder 3 moves upward under the thrust of the insulin pen, the protrusion 32 moves upward with the shielding cylinder 3 and approaches the placement groove 14. The limiting block 31 also moves along the first guide slope 13 at the same time as the shielding cylinder 3 moves upward, thereby driving the shielding cylinder 3 to rotate. The rotation of the shielding cylinder 3 will cause the protrusion 32 to move circumferentially along the shielding cylinder 3, so that the upper end of the second guide slope 321 on the protrusion 32 contacts and abuts with the lower end of the third guide slope 141 of the placement groove 14. As the shielding cylinder 3 rotates, the contact area between the second guide slope 321 and the third guide slope 141 increases, and the protrusion 32 can enter the placement groove 14 along the third guide slope 141, ensuring the stability of the shielding cylinder 3 when it moves upward and rotates. After the limiting block 31 enters the moving groove 11 through the limiting groove 12, the shielding cylinder 3 stops moving upward, and the protrusion 32 is placed in the placement groove 14, with the second guide slope 321 and the third guide slope 141 abutting against each other.

[0033] It should be noted that, in this embodiment, as Figure 2 As shown, the bottom wall of the protrusion 32 is flush with the bottom wall of the shielding cylinder 3. When the shielding cylinder 3 comes into contact with the insulin pen, the protrusion 32 also comes into contact with the insulin pen, increasing the overall contact area between the shielding cylinder 3 and the insulin pen when the shielding cylinder 3 moves, thus improving the stability of the upward movement.

[0034] Optionally, the limiting block 31 has a fourth guide slope 311 on the side away from the moving groove 11, and a fifth guide slope 111 is provided at the connection between the moving groove 11 and the limiting groove 12. The lower end of the fifth guide slope 111 is closer to the moving groove 11 than the upper end. The fourth guide slope 311 is parallel to the fifth guide slope 111. When the limiting block 31 moves down along the moving groove 11 and passes through the connection between the moving groove 11 and the limiting groove 12, the fourth guide slope 311 is used to abut against the fifth guide slope 111.

[0035] To prevent the limiting block 31 from entering the limiting groove 12 when it moves downward, in this embodiment, as follows: Figure 1 and Figure 2As shown, a fourth guide slope 311 is provided on the side of the limiting block 31 away from the moving groove 11, and a fifth guide slope 111 is provided at the connection between the moving groove 11 and the limiting groove 12. The lower end of the fifth guide slope 111 is closer to the moving groove 11 than the upper end. The fourth guide slope 311 and the fifth guide slope 111 are parallel. When the limiting block 31 moves down along the moving groove 11 and passes through the connection between the moving groove 11 and the limiting groove 12, the fourth guide slope 311 is used to abut against the fifth guide slope 111. With this configuration, when the shielding cylinder 3 moves downward, the limiting block 31 moves downward along the moving groove 11. When it passes the connection between the moving groove 11 and the limiting groove 12, the fourth guide slope 311 abuts against the fifth guide slope 111. The downward force on the limiting block 31 acts on the fifth guide slope 111 and is divided into a component force along the fifth guide slope 111 and a component force perpendicular to the fifth guide slope 111. The component force along the fifth guide slope 111 is inclined downward from the limiting groove 12 and points towards the moving groove 11. Under the action of this component force, the limiting block 31 maintains stable movement within the moving groove 11 and will not enter the limiting groove 12. Moreover, the fourth guide slope 311 can slide relative to the fifth guide slope 111 to ensure the stability of the limiting block 31 moving along the fifth guide slope 111.

[0036] Optionally, the inner wall of the needle holder 1 is also provided with a transition groove 15 extending axially. The transition groove 15 is located above the moving groove 11 and communicates with the moving groove 11. When the needle holder 1 is installed on the insulin pen, the limiting block 31 is located in the transition groove 15.

[0037] In this embodiment, as Figures 1 to 3 As shown, a transition groove 15 extending axially is provided on the inner wall of the needle holder 1. The transition groove 15 is located above and communicates with the moving groove 11. When the needle holder 1 is installed on the insulin pen, the limiting block 31 is located in the transition groove 15. With this arrangement, after the shielding cylinder 3 is pushed upward and drives the limiting block 31 from the limiting groove 12 into the moving groove 11, the shielding cylinder 3 continues to move upward so that the limiting block 31 enters the transition groove 15. The transition groove 15 extends axially along the needle holder 1. When the needle holder 1 is removed from the insulin pen, the opposite side walls of the transition groove 15 can provide a limit for the limiting block 31, so that the limiting block 31 maintains vertical downward movement, provides a certain initial velocity, and thus stably enters the moving groove 11. This further avoids the downward movement of the limiting block 31 from deviating, which would cause the shielding cylinder 3 to fail to completely cover the lower end of the shielding injection needle 2.

[0038] Optionally, the inner wall of the needle holder 1 is also provided with a receiving groove 17, the middle section of the moving groove 11 is connected to the receiving groove 17, and an elastic rod 171 is provided between the moving groove 11 and the receiving groove 17. The elastic rod 171 is inclined toward the moving groove 11 and is used to swing back and forth between the moving groove 11 and the receiving groove 17.

[0039] In this embodiment, as Figure 1 and Figure 3 As shown, a receiving groove 17 is provided on the inner wall of the needle holder 1. The receiving groove 17 is located below the limiting groove 12. An elastic rod 171 is provided between the moving groove 11 and the receiving groove 17. The elastic rod 171 is inclined towards the moving groove 11 and is used to swing back and forth between the moving groove 11 and the receiving groove 17. With this arrangement, when the limiting block 31 moves downward along the moving groove 11, because the elastic rod 171 is inclined towards the moving groove 11, the limiting block 31 will press one side of the elastic rod 171 towards the receiving groove 17, so that the elastic rod 171 swings towards the receiving groove 17, and the limiting block 31 can continue to move downward. After the limiting block 31 passes, the elastic rod 171... When the pressure disappears, the elastic rod 171 returns to its original position. At this time, if the shielding cylinder 3 is subjected to an upward thrust, the limiting block 31 abuts against the other side of the elastic rod 171, thereby squeezing the elastic rod 171 in a direction away from the receiving groove 17. On the opposite side of the receiving groove 17, relative to the elastic rod 171, is the side wall of the moving groove 11. The side wall of the moving groove 11 will limit the swing of the elastic rod 171, preventing the limiting block 31 from moving upward. This avoids the user accidentally touching the shielding cylinder 3 and giving it an upward thrust, causing the lower end of the injection needle 2 to be exposed and resulting in accidental puncture. This further avoids the safety risks that exist when disassembling the lower end of the injection needle.

[0040] Optionally, the lower end of the elastic rod 171 is inclined toward the moving groove 11, and the distance between the lower end of the elastic rod 171 and the side wall of the moving groove 11 away from the receiving groove 17 is less than the width of the limiting block 31.

[0041] In this embodiment, as Figure 1 and Figure 2As shown, the lower end of the elastic rod 171 is inclined toward the moving groove 11, and the distance between the lower end of the elastic rod 171 and the side wall of the moving groove 11 away from the receiving groove 17 is less than the width of the limiting block 31. With this configuration, since the lower end of the elastic rod 171 is inclined toward the moving groove 11, when the limiting block 31 moves downward along the moving groove 11, the limiting block 31 will press one side of the lower end of the elastic rod 171 toward the receiving groove 17, causing the elastic rod 171 to swing toward the receiving groove 17. The limiting block 31 can continue to move downward, and after the limiting block 31 passes, the pressing force on the lower end of the elastic rod 171 disappears, and the elastic rod 171 returns to its original position. At this time, if the shielding cylinder 3 is subjected to an upward thrust, the limiting block 31 and the lower end of the elastic rod 171... The other side abuts against each other, thereby squeezing the lower end of the elastic rod 171 in the direction away from the receiving groove 17. Relative to the lower end of the elastic rod 171, the side wall of the moving groove 11 is located on the opposite side of the receiving groove 17. The side wall of the moving groove 11 will limit the swing of the lower end of the elastic rod 171, so that the limiting block 31 cannot move upward, thereby avoiding the user accidentally touching the shielding cylinder 3 and giving it an upward push, causing the lower end of the injection needle 2 to be exposed and resulting in accidental puncture. This further avoids the safety risks that exist when the lower end of the injection needle is disassembled.

[0042] Optionally, the needle holder 1 is provided with a mounting post 16, which is located on the inner top wall of the needle holder 1. The spring 4 and the shielding cylinder 3 are both sleeved on the mounting post 16, and the mounting post 16 is used to install the injection needle 2 through it.

[0043] To ensure the stability of the installation and movement of the spring 4 and the shielding cylinder 3, in this embodiment, as follows: Figures 1 to 3 As shown, a mounting post 16 is provided inside the needle holder 1. The mounting post 16 is located on the inner top wall of the needle holder 1 and can be used for the injection needle 2 to pass through and install, ensuring the installation stability of the injection needle 2. On this basis, the spring 4 and the shielding cylinder 3 can be sleeved on the mounting post 16 to improve the installation stability of the spring 4 and the shielding cylinder 3. Moreover, the mounting post 16 can guide the extension and retraction of the spring 4 and the movement of the shielding cylinder 3, ensuring the stability of the movement of the spring 4 and the shielding cylinder 3.

[0044] Optionally, the lower end shielding device of the injection needle also includes a connecting seat 5. The connecting seat 5 is a hollow structure with openings at both the top and bottom. The needle seat 1 and the connecting seat 5 are connected vertically. The lower end of the shielding cylinder 3 is located inside the connecting seat 5. The inner wall of the connecting seat 5 is provided with threads. The connecting seat 5 is used to connect with the insulin pen through the threads so that the insulin pen abuts against the shielding cylinder 3 and drives the shielding cylinder 3 to move upward.

[0045] To improve the connection stability between the needle hub 1 and the insulin pen, in this embodiment, as follows: Figures 1 to 3As shown, a connecting seat 5 is also provided. The connecting seat 5 is a hollow structure with openings at both the top and bottom. The needle holder 1 and the connecting seat 5 are connected vertically. The inner wall of the connecting seat 5 is provided with threads. The connecting seat 5 is used to connect to the insulin pen through the threads. This design allows the upper end of the insulin pen to be screwed into the connecting seat 5, improving the connection stability between the needle holder 1 and the insulin pen. Moreover, the lower end of the injection needle 2 inside the needle holder 1 punctures into the vial as the insulin pen rotates and moves upward. In addition, the lower end of the shielding cylinder 3 is located inside the connecting seat 5. This design allows the lower end of the shielding cylinder 3 to abut against the lower end of the shielding cylinder 3 as the insulin pen rotates and moves upward and is installed in the connecting seat 5, thereby driving the shielding cylinder 3 to move upward.

[0046] On the other hand, one embodiment of the present invention provides an injection device, including an injection needle 2, an insulin pen, and the aforementioned injection needle lower end shielding device.

[0047] like Figures 1 to 3 As shown, the technical effect of the injection device in this embodiment is similar to that of the injection needle lower end shielding device described above, and will not be repeated here.

[0048] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A shielding device for the lower end of an injection needle, characterized in that, include: A needle holder (1) is used to install the injection needle (2) of the injection device and to install it on the insulin pen of the injection device. The inner wall of the needle holder (1) is provided with a moving groove (11), a limiting groove (12) and a first guide slope (13). The moving groove (11) extends along the axial direction of the needle holder (1). The limiting groove (12) is located on the upper side of the moving groove (11). The limiting groove (12) is connected to the moving groove (11) through the first guide slope (13). The end of the first guide slope (13) connected to the limiting groove (12) is higher than the end of the first guide slope (13) connected to the moving groove (11). A shielding cylinder (3) is installed inside the needle holder (1) and allows the injection needle (2) to pass through. The side wall of the shielding cylinder (3) is provided with a limiting block (31) for placement in the limiting groove (12). The limiting block (31) is located below the first guide slope (13). When the needle holder (1) is installed on the insulin pen, the shielding cylinder (3) abuts against the insulin pen and moves upward so that the limiting block (31) in the limiting groove (12) enters the moving groove (11) along the first guide slope (13). When the needle holder (1) is separated from the insulin pen, the limiting block (31) moves downward along the moving groove (11) so that the shielding cylinder (3) covers and shields the lower end of the injection needle (2).

2. The injection needle lower end shielding device according to claim 1, characterized in that, The needle seat (1) is a hollow structure with an open bottom. The shielding cylinder (3) is slidably installed inside the needle seat (1) through the open end of the needle seat (1). A spring (4) is provided between the inner top wall of the needle seat (1) and the shielding cylinder (3). When the limiting block (31) is located in the limiting groove (12), the spring (4) is in a compressed state.

3. The injection needle lower end shielding device according to claim 2, characterized in that, The shielding cylinder (3) has a boss (32) on its side wall. The upper surface of the boss (32) has a second guide slope (321). The needle seat (1) has a downward-opening placement groove (14) at the edge of its opening end. The inner top wall of the placement groove (14) has a third guide slope (141). The second guide slope (321), the third guide slope (141) and the first guide slope (13) all extend along the circumference of the needle seat (1) and have the same inclination direction and inclination angle. When the limiting block (31) is located in the limiting groove (12), the boss (32) is located below the needle seat (1). When the limiting block (31) enters the moving groove (11) from the limiting groove (12), the boss (32) is placed in the placement groove (14), and the second guide slope (321) and the third guide slope (141) fit together and abut against each other.

4. The injection needle lower end shielding device according to claim 2, characterized in that, The limiting block (31) has a fourth guide slope (311) on the side away from the moving groove (11), and a fifth guide slope (111) is provided at the connection between the moving groove (11) and the limiting groove (12). The lower end of the fifth guide slope (111) is closer to the moving groove (11) than the upper end. The fourth guide slope (311) is parallel to the fifth guide slope (111). When the limiting block (31) moves down along the moving groove (11) and passes through the connection between the moving groove (11) and the limiting groove (12), the fourth guide slope (311) is used to abut against the fifth guide slope (111).

5. The injection needle lower end shielding device according to claim 4, characterized in that, The inner wall of the needle holder (1) is also provided with a transition groove (15) extending axially. The transition groove (15) is located above the moving groove (11) and communicates with the moving groove (11). When the needle holder (1) is installed on the insulin pen, the limiting block (31) is located in the transition groove (15).

6. The injection needle lower end shielding device according to claim 2, characterized in that, The needle holder (1) is also provided with a receiving groove (17) on its inner wall. The middle section of the moving groove (11) is connected to the receiving groove (17). An elastic rod (171) is provided between the moving groove (11) and the receiving groove (17). The elastic rod (171) is inclined toward the moving groove (11) and is used to swing back and forth between the moving groove (11) and the receiving groove (17).

7. The injection needle lower end shielding device according to claim 6, characterized in that, The lower end of the elastic rod (171) is inclined toward the moving groove (11), and the distance between the lower end of the elastic rod (171) and the side wall of the moving groove (11) away from the receiving groove (17) is less than the width of the limiting block (31).

8. The injection needle lower end shielding device according to any one of claims 2 to 7, characterized in that, The needle holder (1) is provided with a mounting post (16), which is located on the inner top wall of the needle holder (1). The spring (4) and the shielding cylinder (3) are both sleeved on the mounting post (16). The mounting post (16) is used to install the injection needle (2) through it.

9. The injection needle lower end shielding device according to any one of claims 2 to 7, characterized in that, It also includes a connecting seat (5), which is a hollow structure with openings at both the top and bottom. The needle seat (1) and the connecting seat (5) are connected vertically. The lower end of the shielding cylinder (3) is located inside the connecting seat (5). The inner wall of the connecting seat (5) is provided with threads. The connecting seat (5) is used to connect to the insulin pen through the threads so that the insulin pen abuts against the shielding cylinder (3) and drives the shielding cylinder (3) to move upward.

10. An injection device, characterized in that, It includes an injection needle (2), an insulin pen, and a lower end shielding device for the injection needle as described in any one of claims 1 to 9.

Images