Device for shielding the lower end of an injection needle and injection device

Abstract

Device for shielding the lower end of an injection needle, comprising: a needle holder (1), wherein the needle holder (1) is used for mounting an injection needle (2) of an injection device and is attached to an insulin pen of the injection device, wherein the needle holder (1) is provided on its inner wall with a movement groove (11), a limiting groove (12) and a first guide slope (13), wherein the movement groove (11) is arranged to extend in an axial direction of the needle holder (1), wherein the limiting groove (12) is located on one side of the upper end of the movement groove (11), wherein the limiting groove (12) is connected to the movement groove (11) via the first guide slope (13), and wherein one end of the first guide slope (13) connected to the limiting groove (12) is lower than the end of the first guide slope (13) connected to the movement groove (11); a shielding sleeve (3), wherein the shielding sleeve (3) is mounted in the needle holder (1) and is to be penetrated by the injection needle (2), wherein a limit stop (31) for insertion into the limit groove (12) is provided on a side wall of the shielding sleeve (3), wherein the limit stop (31) is located below the first guide bevel (13), wherein, when the needle holder (1) is mounted on the insulin pen, the shielding sleeve (3) rests against the insulin pen and is moved upwards so that the limit stop (31) in the limit groove (12) can reach the movement groove (11) along the first guide bevel (13), and wherein, when the needle holder (1) is separated from the insulin pen, the limit stop (31) is moved downwards along the movement groove (11) so that the shielding sleeve (3) covers or shields the lower end of the injection needle (2); wherein the needle holder (1) has a hollow structure with an opening at the lower end, wherein the shielding sleeve (3) is slidably disposed in the needle holder (1) through the open end of the needle holder (1), wherein a spring (4) is provided between an inner upper wall of the needle holder (1) and the shielding sleeve (3), and wherein the spring (4) is in a compressed state when the limit stop (31) is located in the limiting groove (12); characterized in that a shoulder (32) is provided on the side wall of the shielding sleeve (3), the shoulder (32) being provided with a second guide bevel (321) on its upper end surface, a downwardly opening placement groove (14) being provided on the edge of the open end of the needle holder (1), the placement groove (14) being provided with a third guide bevel (141) on its inner upper wall, the second guide bevel (321), the third guide bevel (141) and the first guide bevel (13) extending in the circumferential direction of the needle holder (1) and being inclined in the same direction and at the same angle, when the limit stop (31) is located in the limit groove (12), the shoulder (32) is located below the needle holder (1), and when the limit stop (31) moves from the limit groove (12) into the movement groove (11),the shoulder (32) is accommodated in the placement groove (14) and the second guide bevel (321) and the third guide bevel (141) abut each other.,

Description

Technical area

[0001] The present invention relates to the technical field of injection devices, in particular to a device for shielding the lower end of an injection needle and an injection device. State of the art

[0002] Diabetes is reaching epidemic proportions and becoming an increasingly serious threat worldwide. Currently, blood sugar levels in diabetics are primarily controlled through insulin injections. Insulin is injected using a special injection device attached to an injection needle, the upper end of which is used for the liquid medication to exit and the lower end for the liquid medication to enter.

[0003] To ensure the injection needle can introduce the liquid medication stably, the lower end of the injection needle is relatively sharp and can be inserted into an injection vial intended for the injection device. While the sharp lower end meets the requirements for insertion of the injection needle, it also poses a safety risk during removal of the injection needle, as the sharp lower end can injure the user.

[0004] CN 2 17 988 093 U discloses a bottle-introducing end protection structure of a needle mateable with a safety insulin pen comprising a needle hub, a needle body and a safety element.

[0005] US 2020 / 0 360 624 A1 discloses a safe insulin pen needle having a structure that obviates the risk of needle head protection failure.

[0006] EP 3 721 925 B1 discloses a safety device for a pre-filled syringe comprising a hollow support body for holding the pre-filled syringe therein, a hollow needle guard displaceable relative to the support body, and guide means for guiding the movement of the needle guard relative to the support body.

[0007] DE 10 2006 042 233 B3 discloses a needle protection device that is removably attached to an injection device, including a needle. Disclosure of the invention

[0008] The object of the present invention is to avoid the safety risks associated with the lower end of the injection needle during removal.

[0009] In order to solve the above problems, the present invention provides, on the one hand, a device for shielding the lower end of an injection needle, comprising: a needle holder, wherein the needle holder is used for mounting an injection needle of an injection device and is attached to an insulin pen of the injection device, wherein the needle holder is provided on its inner wall with a movement groove, a limiting groove and a first guide slope, wherein the movement groove is arranged to extend in an axial direction of the needle holder, wherein the limiting groove is located on one side of the upper end of the movement groove, wherein the limiting groove is connected to the movement groove via the first guide slope, and wherein an end of the first guide slope that is connected to the limiting groove is higher than the end of the first guide slope that is connected to the movement groove; a shielding sleeve, wherein the shielding sleeve is mounted in the needle holder and is to be penetrated by the injection needle, wherein a limit stop is provided on a side wall of the shielding sleeve for insertion into the limiting groove, wherein the limit stop is located below the first guide bevel, wherein, when the needle holder is mounted on the insulin pen, the shielding sleeve rests against the insulin pen and is moved upwards so that the limit stop in the limiting groove can reach the movement groove along the first guide bevel, and wherein, when the needle holder is separated from the insulin pen, the limit stop is moved downwards along the movement groove so that the shielding sleeve covers or shields the lower end of the injection needle.

[0010] Compared with the prior art, the advantageous effects of the injection needle lower end shielding device of the present invention include: a needle holder is configured as a mounting structure for an injection needle of an injection device and can be attached to an insulin pen so that the lower end of the injection needle can be inserted into an injection vial provided for the insulin pen, thereby facilitating the injection of a liquid medicine through the injection needle; and a shielding sleeve is mounted in the needle holder to be penetrated by the injection needle, thereby not interfering with the mounting and normal operation of the injection needle.Based on this, it is provided that a limiting groove is provided on the inner wall of the needle holder and a limiting stop is provided on the side wall of the shielding sleeve. In the initial position of the shielding sleeve, the limiting stop is located in the limiting groove, and the limiting groove limits the limiting stop to prevent upward and downward movement of the limiting stop and thus ensure the stability of the shielding sleeve in the initial position. At the same time, a movement groove is provided on the inner wall of the needle holder, which is arranged running in an axial direction of the needle holder. The limiting groove is located on one side of the upper end of the movement groove and is connected to the movement groove via a first guide bevel.Here, one end of the first guide bevel, which is connected to the limiting groove, is positioned higher than the end of the first guide bevel, which is connected to the movement groove; and the limit stop is located below the first guide bevel. In this way, when an injection of a liquid medication is required during assembly of the needle holder on the insulin pen, the lower end of the shielding sleeve in the needle holder first rests against the insulin pen, and the lower end of the injection needle is inserted into the injection vial provided for the insulin pen.As the injection needle extends further into the injection vial, the shielding sleeve is also moved upward by the thrust of the insulin pen. The upward movement of the shielding sleeve causes the limit stop to move upward. The limit stop is again located below the first guide bevel, so that the limit stop is moved upward until it rests against the first guide bevel. As the shielding sleeve continues to move upward, the limit stop moves along the first guide bevel and causes the shielding sleeve to rotate along the circumferential direction of the needle holder. After the needle holder is successfully attached to the insulin pen, the limit stop finally moves from the limit groove to the movement groove and remains stable up and down with the limit of the insulin pen and the limit of the upper wall of the movement groove.At this point, the insulin pen can be used normally, with the liquid medication being injected through the injection needle. After the injection of the liquid medication is complete, the injection needle must be removed from the insulin pen, separating the insulin pen from the shielding sleeve, and the shielding sleeve is no longer subject to the lower limit. The limit stop can now be moved downward along the movement groove, causing the shielding sleeve to also move downward and gradually cover the lower end of the injection needle. When the injection needle is completely removed from the insulin pen, the limit stop also moves downward, where it rests against a lower wall of the movement groove, and the shielding sleeve moves downward to the limit position, completely covering or shielding the lower end of the injection needle.This prevents a user from accidentally touching the bottom of the injection needle, which could result in a puncture, and thus avoids safety hazards at the bottom of the injection needle during removal.

[0011] Optionally, the needle holder comprises a hollow structure having an opening at the lower end, wherein the shielding sleeve is slidably disposed in the needle holder through the open end of the needle holder, wherein a spring is provided between an inner upper wall of the needle holder and the shielding sleeve, and wherein the spring is in a compressed state when the limit stop is located in the limit groove.

[0012] Optionally, it is provided that a shoulder is provided on the side wall of the shielding sleeve, wherein the shoulder is provided with a second guide bevel on its upper end surface, wherein a downwardly opening placement groove is provided on the edge of the open end of the needle holder, wherein the placement groove is provided with a third guide bevel on its inner upper wall, wherein the second guide bevel, the third guide bevel and the first guide bevel extend in the circumferential direction of the needle holder and are inclined in the same direction and at the same angle, wherein, when the limit stop is located in the limit groove, the shoulder is located below the needle holder, and wherein, when the limit stop moves from the limit groove into the movement groove, the shoulder is accommodated in the placement groove and the second guide bevel and the third guide bevel abut one another.

[0013] Optionally, it is provided that a fourth guide bevel is provided on a side of the limit stop facing away from the movement groove, wherein a fifth guide bevel is provided at the connection point between the movement groove and the limit groove, wherein the lower end of the fifth guide bevel is closer to the movement groove than the upper end, wherein the fourth guide bevel and the fifth guide bevel are parallel to one another, wherein, when the limit stop is moved downwards along the movement groove and is guided through the connection point between the movement groove and the limit groove, the fourth guide bevel is used to bear against the fifth guide bevel.

[0014] Optionally, it is provided that a transition groove is further provided on the inner wall of the needle holder, which is arranged running in the axial direction, wherein the transition groove is located above the movement groove and is connected to the movement groove, and wherein, after the needle holder is attached to the insulin pen, the limit stop is located in the transition groove.

[0015] Optionally, it is provided that a receiving groove is further provided on the inner wall of the needle holder, wherein a lower portion of the movement groove is connected to the receiving groove, wherein an elastic lever is provided between the movement groove and the receiving groove, and wherein the elastic lever is inclined towards the movement groove and is used to move back and forth between the movement groove and the receiving groove.

[0016] Optionally, it is provided that the lower end of the elastic lever is inclined in the direction of the movement groove, wherein the distance between the lower end of the elastic lever and the side wall of the movement groove facing away from the receiving groove is smaller than the width of the limit stop.

[0017] Optionally, it is provided that a mounting support is provided in the needle holder, wherein the mounting support is arranged on the inner upper wall of the needle holder, wherein the spring and the shielding sleeve are placed on the mounting support, and wherein the mounting support serves for the continuous mounting of the injection needles.

[0018] Optionally, the device for shielding the lower end of an injection needle further comprises a connecting seat, the connecting seat having a hollow structure with openings at the upper and lower ends, the lower end of the needle holder being connected to the upper end of the connecting seat, the lower end of the shielding sleeve being located in the connecting seat, a thread being provided on the inner wall of the connecting seat, and the connecting seat being connected to the insulin pen via the thread, so that the insulin pen rests against the shielding sleeve and pushes the shielding sleeve upwards.

[0019] On the other hand, the present invention also provides an injection device comprising an injection needle, an insulin pen and a device for shielding the lower end of an injection needle as described above.

[0020] Compared to the prior art, the advantageous effects of the injection device of the present invention are the same as those of the above-described device for shielding the lower end of an injection needle and are not repeated here. Short description of the characters Fig. 1 shows a schematic internal view of a device for shielding the lower end of an injection needle according to an embodiment of the present invention prior to shielding; Fig. 2 shows a schematic exploded view of the device for shielding the lower end of an injection needle according to an embodiment of the present invention; Fig. 3 shows a schematic internal view of the device for shielding the lower end of an injection needle according to an embodiment of the present invention after shielding. List of reference symbols:

[0021] 1- Needle holder; 11- Movement groove; 111- Fifth guide bevel; 12- Limit groove; 13- First guide bevel; 14- Placement groove; 141- Third guide bevel; 15- Transition groove; 16- Mounting support; 17- Receiving groove; 171- Elastic lever; 2- Injection needle; 3- Shielding sleeve; 31- Limit stop; 311- Fourth guide bevel; 32- Step; 321- Second guide bevel; 4- Spring; 5- Connecting seat. Detailed embodiments

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] It should be noted that in the XYZ coordinate system used herein, the forward direction of the X-axis represents the right side, the backward direction of the X-axis represents the left side, the forward direction of the Y-axis represents the front side, the backward direction of the Y-axis represents the back side, the forward direction of the Z-axis represents the top side, and the backward direction of the Z-axis represents the bottom side. It should also be noted that the terms "first," "second," etc., in the description, claims, and aforementioned figures of the invention are used only to distinguish similar objects without implying any particular order or sequence. It should be understood that the data thus used are interchangeable, where appropriate, so that the embodiments of the invention described herein may be practiced in a different order than that shown or described herein.

[0024] In one aspect, a device for shielding the lower end of an injection needle according to an embodiment of the present invention is provided, comprising: a needle holder 1, wherein the needle holder 1 is used for mounting an injection needle 2 of an injection device and is attached to an insulin pen of the injection device, wherein the needle holder 1 is provided on its inner wall with a movement groove 11, a limiting groove 12, and a first guide slope 13, wherein the movement groove 11 is arranged to extend in an axial direction of the needle holder 1, wherein the limiting groove 12 is located on one side of the upper end of the movement groove 11, wherein the limiting groove 12 is connected to the movement groove 11 via the first guide slope 13, and wherein an end of the first guide slope 13 connected to the limiting groove 12 is higher than the end of the first guide slope 13,which is connected to the movement groove 11, a shielding sleeve 3, wherein the shielding sleeve 3 is mounted in the needle holder 1 and is intended to be penetrated by the injection needle 2, wherein a limit stop 31 is provided on a side wall of the shielding sleeve 3 for insertion into the limiting groove 12, wherein the limit stop 31 is located below the first guide bevel 13, wherein when the needle holder 1 is mounted on the insulin pen, the shielding sleeve 3 rests against the insulin pen and is moved upwards so that the limit stop 31 in the limiting groove 12 can reach the movement groove 11 along the first guide bevel 13, and wherein, when the needle holder 1 is separated from the insulin pen, the limit stop 31 is moved downwards along the movement groove 11 so that the shielding sleeve 3 covers or shields the lower end of the injection needle 2.

[0025] It should be noted that in this embodiment of the present invention, for the injection device and the various components of the injection device, the upper end is the end that is close to the puncture site of the skin of the human body when the injection device is used, and the lower end is the end that is far from the puncture site of the skin of the human body when the injection device is used.

[0026] In this embodiment it is provided that, as in Fig. 1 and Fig. 2, the needle holder 1 is designed as a mounting structure for the injection needle 2 of the injection device, and the needle holder 1 can be attached to the insulin pen so that the lower end of the injection needle 2 can be inserted into an injection vial provided for the insulin pen, thereby facilitating the injection of a liquid medication through the injection needle 2; and that the shielding sleeve 3 is mounted in the needle holder 1, wherein the shielding sleeve 3 is intended to be penetrated by the injection needle 2, whereby the assembly and normal operation of the injection needle 2 are not disturbed.Based on this, it is provided that the limiting groove 12 is provided on the inner wall of the needle holder 1 and the limiting stop 31 is provided on the side wall of the shielding sleeve 3. In the initial position of the shielding sleeve 3, the limiting stop 31 is located in the limiting groove 12 and the limiting groove 12 limits the limiting stop 31 in order to prevent upward and downward movement of the limiting stop 31 and thus ensure the stability of the shielding sleeve 3 in the initial position. At the same time, the movement groove 11 is provided on the inner wall of the needle holder 1. The movement groove 11 is arranged running in the axial direction of the needle holder 1, and the limiting groove 12 is located on the side of the upper end of the movement groove 11 and is connected to the movement groove 11 via the first guide bevel 13.Here, it is provided that the end of the first guide bevel 13, which is connected to the limiting groove 12, is higher than the end of the first guide bevel 13, which is connected to the movement groove 11; and that the limit stop 31 is located below the first guide bevel 13. In this way, during assembly of the needle holder 1 to the insulin pen, when an injection of a liquid medication is required, the lower end of the shielding sleeve 3 in the needle holder 1 first rests against the insulin pen, and the lower end of the injection needle 2 is inserted into the injection vial provided for the insulin pen.As the injection needle 2 penetrates the injection vial further, the shielding sleeve 3 is also moved upward by the thrust of the insulin pen, and the upward movement of the shielding sleeve 3 causes the limit stop 31 to move upward, with the limit stop 31 again located below the first guide bevel 13, so that the limit stop 31 is moved upward until it rests against the first guide bevel 13. As the shielding sleeve 3 moves further upward, the limit stop 31 moves along the first guide bevel 13 and sets the shielding sleeve 3 in a rotational movement along the circumferential direction of the needle holder 1. After the needle holder 1 has been successfully attached to the insulin pen, the limit stop 31 finally moves from the limit groove 12 into the movement groove 11 and remains stable up and down with the limit of the insulin pen and the limit of the upper wall of the movement groove 11.At this time, the insulin pen can be normally operated, with the liquid medication being injected via the injection needle 2. After the injection of the liquid medication is completed, the injection needle 2 must be removed from the insulin pen, whereby the insulin pen is separated from the shielding sleeve 3 and the shielding sleeve 3 is no longer subject to the lower limit. Now, the limit stop 31 can be moved downward along the movement groove 11, causing the shielding sleeve 3 to also move downward and gradually cover the lower end of the injection needle 2. When the injection needle 2 is completely removed from the insulin pen, as shown in . Fig. 3, the limit stop 31 also moves downward, where it abuts against a lower wall of the movement groove 11, and the shielding sleeve 3 moves downward to the limit position, completely covering or shielding the lower end of the injection needle 2. This prevents a user from accidentally touching the lower end of the injection needle 2, which could result in a puncture, and thus avoids safety hazards at the lower end of the injection needle during removal.

[0027] Optionally, the needle holder 1 is provided with a hollow structure having an opening at the lower end, the shielding sleeve 3 being slidably disposed in the needle holder 1 through the open end of the needle holder 1, a spring 4 being provided between an inner upper wall of the needle holder 1 and the shielding sleeve 3, and the spring 4 being in a compressed state when the limit stop 31 is located in the limiting groove 12.

[0028] In order to increase the stability of the cover or shielding of the shielding sleeve 3 against the lower end of the injection needle 2, it is provided in this embodiment that, as in Fig. 1 and Fig. 2, the needle holder 1 is designed as a hollow structure with an opening at the lower end, wherein the shielding sleeve 3 is slidably arranged in the needle holder 1 through the open end of the needle holder 1, wherein the spring 4 is arranged between the inner upper wall of the needle holder 1 and the shielding sleeve 3, and wherein the spring 4 is in a compressed state when the limit stop 31 is in the limiting groove 12, ie when the shielding sleeve 3 is in the starting position. In this way, when the needle holder 1 is mounted on the insulin pen, ieWhen the lower end of the injection needle 2 is inserted into the injection vial of the insulin pen, which is pre-filled with the liquid medication, the insulin pen rests on the lower end of the shielding sleeve 3, whereby the shielding sleeve 3 is pushed upwards and the spring 4 is further compressed, while the limit stop 31 moves from the limit groove 12 into the movement groove 11. After the injection, the injection needle 2 is withdrawn from the insulin pen, the pressure on the spring 4 decreases and the spring 4 expands. By being supported on the inner upper wall of the needle holder 1, the spring 4 exerts an elastic preload on the shielding sleeve 3, so that the shielding sleeve 3 is pressed downwards, where it covers or shields the lower end of the injection needle 2, with the limit stop 31 being moved synchronously along the movement groove 11. As shown in . Fig. 3, when the limit stop 31 abuts the lower wall of the movement groove 11, it means that the shielding sleeve 3 covers or shields the lower end of the injection needle 2. Due to the limitation of the lower wall of the movement groove 11 to the limit stop 31, the shielding sleeve 3 can also not move further downward out of the needle holder 1, thereby ensuring the stability of the cover or shielding of the shielding sleeve 3 against the lower end of the injection needle 2. In addition, after the shielding sleeve 3 covers or shields the lower end of the injection needle 2, the spring 4 can also be in the compressed state and continuously exert downward pressure on the shielding sleeve 3 to prevent the user from accidentally touching the shielding sleeve 3 and thus exerting an upward thrust on it, thereby exposing the lower end of the injection needle 2 and causing accidental puncture.This further avoids the safety risks associated with the lower end of the injection needle during removal.

[0029] Optionally, a shoulder 32 is provided on the side wall of the shielding sleeve 3, wherein the shoulder 32 is provided on its upper end surface with a second guide bevel 321, wherein a downwardly opening placement groove 14 is provided on the edge of the open end of the needle holder 1, wherein the placement groove 14 is provided on its inner upper wall with a third guide bevel 141, wherein the second guide bevel 321, the third guide bevel 141 and the first guide bevel 13 extend in the circumferential direction of the needle holder 1 and are inclined in the same direction and at the same angle, wherein, when the limit stop 31 is located in the limit groove 12, the shoulder 32 is located below the needle holder 1, and wherein, when the limit stop 31 moves from the limit groove 12 into the movement groove 11,the shoulder 32 is accommodated in the placement groove 14 and the second guide bevel 321 and the third guide bevel 141 abut each other.,

[0030] In order to ensure stability during the upward movement of the shielding sleeve 3, it is provided in this embodiment that, as in Fig. 1 and Fig. 2, a shoulder 32 is provided on the side wall of the shielding sleeve 3, wherein the shoulder 32 is provided with a second guide bevel 321, wherein a downwardly opening placement groove 14 is provided on the edge of the open end of the needle holder 1, wherein the placement groove 14 is provided on its inner upper wall with a third guide bevel 141, wherein the second guide bevel 321, the third guide bevel 141 and the first guide bevel 13 extend in the circumferential direction of the needle holder 1 and are inclined in the same direction and at the same angle, wherein, when the limit stop 31 is located in the limit groove 12, the shoulder 32 is located below the needle holder 1, and wherein, when the limit stop 31 moves from the limit groove 12 into the movement groove 11, the shoulder 32 is accommodated in the placement groove 14 and the second guide bevel 321 and the third guide bevel 141 lie against each other.In this way, when the shielding sleeve 3 is moved upward by the thrust exerted by the insulin pen, the shoulder 32 also moves upward with the shielding sleeve 3 and approaches the placement groove 14, and the limit stop 31 moves simultaneously with the upward movement of the shielding sleeve 3 along the first guide slope 13 to cause the shielding sleeve 3 to rotate. The rotational movement of the shielding sleeve 3 causes the shoulder 32 to move in the circumferential direction of the shielding sleeve 3, so that the upper end of the second guide slope 321 on the shoulder 32 and the lower end of the third guide slope 141 of the placement groove 14 come into contact with each other and abut against each other.With the rotation of the shielding sleeve 3, the contact area between the second guide slope 321 and the third guide slope 141 increases, allowing the shoulder 32 to enter the placement groove 14 along the third guide slope 141, ensuring the stability of the shielding sleeve 3 when it is moved upward and rotated. After the limit stop 31 moves from the limit groove 12 into the movement groove 11, the shielding sleeve 3 stops its upward movement, and the shoulder 32 is accommodated in the placement groove 14, with the second guide slope 321 and the third guide slope 141 abutting against each other.

[0031] It should be noted that in this embodiment, as in Fig. 2, the lower wall of the shoulder 32 is flush with the lower wall of the shielding sleeve 3, so that when the shielding sleeve 3 abuts the insulin pen, the shoulder 32 also abuts the insulin pen, thereby improving the overall contact area of ​​the shielding sleeve 3 during its movement with the insulin pen and improving the upward movement.

[0032] Optionally, it is provided that a fourth guide bevel 311 is provided on a side of the limit stop 31 facing away from the movement groove 11, wherein a fifth guide bevel 111 is provided at the connection point between the movement groove 11 and the limit groove 12, wherein the lower end of the fifth guide bevel 111 is closer to the movement groove 11 than the upper end, wherein the fourth guide bevel 311 and the fifth guide bevel 111 are parallel to one another, wherein, when the limit stop 31 is moved downwards along the movement groove 11 and is guided through the connection point between the movement groove 11 and the limit groove 12, the fourth guide bevel 311 is used to bear against the fifth guide bevel 111.

[0033] In order to prevent the limit stop 31 from entering the limit groove 12 during its downward movement, it is provided in this embodiment that, as in Fig. 1 and Fig. 2, a fourth guide bevel 311 is provided on a side of the limit stop 31 facing away from the movement groove 11, wherein at the same time a fifth guide bevel 111 is provided at the connection point between the movement groove 11 and the limit groove 12, wherein the lower end of the fifth guide bevel 111 is closer to the movement groove 11 than the upper end, wherein the fourth guide bevel 311 and the fifth guide bevel 111 are parallel to one another, wherein, when the limit stop 31 is moved downwards along the movement groove 11 and is guided by the connection point between the movement groove 11 and the limit groove 12, the fourth guide bevel 311 is used to bear against the fifth guide bevel 111.In this way, when the shielding sleeve 3 moves downward, the limit stop 31 is moved downward along the movement groove 11, and when it passes the junction between the movement groove 11 and the limit groove 12, the fourth guide slope 311 is used to abut against the fifth guide slope 111. The downward force to which the limit stop 31 is subjected acts on the fifth guide slope 111 and is split into a force component along the fifth guide slope 111 and a force component perpendicular to the fifth guide slope 111, the force component along the fifth guide slope 111 being inclined downward from the limit groove 12 and pointing towards the movement groove 11, and under the action of this force component, the limit stop 31 maintains a stable movement within the movement groove 11 and does not enter the limit groove 12.In addition, the fourth guide slope 311 can slide relative to the fifth guide slope 111 to ensure the stability of the movement of the limit stop 31 along the fifth guide slope 111.

[0034] Optionally, it is provided that a transition groove 15 is further provided on the inner wall of the needle holder 1, which is arranged to run in the axial direction, wherein the transition groove 15 is located above the movement groove 11 and is connected to the movement groove 11, and wherein, after the needle holder 1 is attached to the insulin pen, the limit stop 31 is located in the transition groove 15.

[0035] In this embodiment it is provided that, as in Fig. 1 to 3, a transition groove 15 is further provided on the inner wall of the needle holder 1, which is arranged to extend in the axial direction, wherein the transition groove 15 is located above the movement groove 11 and is connected to the movement groove 11, and wherein, after the needle holder 1 is attached to the insulin pen, the limit stop 31 is located in the transition groove 15.In this way, after the shielding sleeve 3 moves upward due to the thrust and causes the limit stop 31 to move from the limit groove 12 into the movement groove 11, the shielding sleeve 3 is moved further upward so that the limit stop 31 moves into the transition groove 15. The transition groove 15 is arranged to run in the axial direction of the needle holder 1 so that when the needle holder 1 is removed from the insulin pen, two opposite side walls of the transition groove 15 can limit the limit stop 31, so that the limit stop 31 maintains its vertical downward movement and has a certain initial speed and then stably moves into the movement groove 11. This also prevents the downward movement of the limit stop 31 from experiencing an offset, which leads to the shielding sleeve 3 being unable to completely cover or shield the lower end of the injection needle 2.

[0036] Optionally, it is provided that a receiving groove 17 is further provided on the inner wall of the needle holder 1, wherein a lower portion of the moving groove 11 is connected to the receiving groove 17, wherein an elastic lever 171 is provided between the moving groove 11 and the receiving groove 17, and wherein the elastic lever 171 is inclined towards the moving groove 11 and is used to move back and forth between the moving groove 11 and the receiving groove 17.

[0037] In this embodiment it is provided that, as in Fig. 1 and Fig. 3, a receiving groove 17 is provided on the inner wall of the needle holder 1, the receiving groove 17 being located below the limiting groove 12, an elastic lever 171 being provided between the moving groove 11 and the receiving groove 17, and the elastic lever 171 being inclined toward the moving groove 11 and being used to move back and forth between the moving groove 11 and the receiving groove 17.In this way, during the downward movement of the limit stop 31 along the movement groove 11, since the elastic lever 171 is inclined toward the movement groove 11, the limit stop 31 presses one side of the elastic lever 171 toward the receiving groove 17, so that the elastic lever 171 swings toward the receiving groove 17, whereby the limit stop 31 can move further downward. After passing the limit stop 31, the pressing force on the elastic lever 171 decreases and the elastic lever 171 is reset. At this time, when the shielding sleeve 3 is subjected to an upward thrust and the limit stop 31 abuts against the other side of the elastic lever 171, the elastic lever 171 is pushed in a direction away from the receiving groove 17.Regarding the elastic lever 171, the side wall of the movement groove 11 is located on the opposite side of the receiving groove 17. The side wall of the movement groove 11 acts to limit the oscillation of the elastic lever 171, so that the limit stop 31 cannot move upward, thus preventing the user from accidentally touching the shielding sleeve 3 and thus exerting an upward thrust on it, thereby exposing the lower end of the injection needle 2 and causing accidental puncture. This further avoids the safety risks associated with the lower end of the injection needle during removal.

[0038] Optionally, it is provided that the lower end of the elastic lever 171 is inclined in the direction of the movement groove 11, wherein the distance between the lower end of the elastic lever 171 and the side wall of the movement groove 11 facing away from the receiving groove 17 is smaller than the width of the limit stop 31.

[0039] In this embodiment it is provided that, as in Fig. 1 and Fig. 2, the lower end of the elastic lever 171 is inclined in the direction of the movement groove 11, wherein the distance between the lower end of the elastic lever 171 and the side wall of the movement groove 11 facing away from the receiving groove 17 is smaller than the width of the limit stop 31. In this way, it is possible that, since the lower end of the elastic lever 171 is inclined in the direction of the movement groove 11, during the downward movement of the limit stop 31 along the movement groove 11, the limit stop 31 presses one side of the lower end of the elastic lever 171 towards the receiving groove 17, so that the elastic lever 171 swings towards the receiving groove 17, wherein the limit stop 31 can move further downwards, and wherein, after the limit stop 31 has been passed, the pressure force on the lower end of the elastic lever 171 decreases and the elastic lever 171 is reset.At this time, when the shielding sleeve 3 is subjected to upward thrust and the limit stopper 31 abuts against the other side of the lower end of the elastic lever 171, the lower end of the elastic lever 171 is pushed in a direction away from the receiving groove 17. With respect to the lower end of the elastic lever 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 acts to limit the oscillation of the lower end of the elastic lever 171, so that the limit stopper 31 cannot move upward, thus preventing the user from inadvertently touching the shielding sleeve 3 and thus exerting an upward thrust on it, thereby exposing the lower end of the injection needle 2 and causing accidental puncture.This further avoids the safety risks associated with the lower end of the injection needle during removal.

[0040] Optionally, it is provided that a mounting support 16 is provided in the needle holder 1, wherein the mounting support 16 is arranged on the inner upper wall of the needle holder 1, wherein the spring 4 and the shielding sleeve 3 are placed on the mounting support 16, and wherein the mounting support 16 serves for the continuous mounting of the injection needles 2.

[0041] In order to ensure the stability of the assembly and movement of the spring 4 and the shielding sleeve 3, it is provided in this embodiment that, as in Fig. 1 to 3, a mounting support 16 is provided in the needle holder 1, wherein the mounting support 16 is arranged on the inner upper wall of the needle holder 1 and can serve for the continuous mounting of the injection needles 2 in order to ensure the stability of the mounting of the injection needle 2. Based on this, it is provided that both the spring 4 and the shielding sleeve 3 can be placed on the mounting support 16 in order to increase the stability of the mounting of the spring 4 and the shielding sleeve 3, and that the mounting support 16 can guide the expansion and contraction of the spring 4 as well as the movement of the shielding sleeve 3 in order to ensure the stability of the movement of the spring 4 and the shielding sleeve 3.

[0042] Optionally, the device for shielding the lower end of an injection needle further comprises a connecting seat 5, the connecting seat 5 having a hollow structure with openings at the upper and lower ends, the lower end of the needle holder 1 being connected to the upper end of the connecting seat 5, the lower end of the shielding sleeve 3 being located in the connecting seat 5, a thread being provided on the inner wall of the connecting seat 5, and the connecting seat 5 being connected to the insulin pen via the thread, so that the insulin pen rests against the shielding sleeve 3 and presses the shielding sleeve 3 upwards.

[0043] In order to increase the stability of the connection between the needle holder 1 and the insulin pen, it is provided in this embodiment that, as in Fig. 1 to 3, a connecting seat 5 is further provided, the connecting seat 5 having a hollow structure with openings at the upper and lower ends, the lower end of the needle holder 1 being connected to the upper end of the connecting seat 5, and a thread being provided on the inner wall of the connecting seat 5, and the connecting seat 5 being connected to the insulin pen via the thread. In this way, the upper end of the insulin pen can be screwed into the connecting seat 5 to increase the stability of the connection between the needle holder 1 and the insulin pen, the lower end of the injection needle 2 in the needle holder 1 being able to be inserted into the injection vial while the insulin pen rotates upwards.Based on this, it is provided that the lower end of the shielding sleeve 3 is located in the connecting seat 5, so that the insulin pen, as it rotates upwards and is thereby attached to the connecting seat 5, rests against the lower end of the shielding sleeve 3, which in turn pushes the shielding sleeve 3 upwards.

[0044] In a further aspect, an injection device according to an embodiment of the present invention is provided, which comprises an injection needle 2, an insulin pen and a device for shielding the lower end of an injection needle as described above.

[0045] As in Fig. 1 to 3, the technical effect of the injection device in this embodiment is similar to the technical effect of the device for shielding the lower end of an injection needle described above and will not be repeated here.

[0046] Although the present invention is disclosed as described above, the scope of the present invention is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention, which fall within the scope of the present invention.

Claims

[1] Device for shielding the lower end of an injection needle, comprising: a needle holder (1), wherein the needle holder (1) is used for mounting an injection needle (2) of an injection device and is attached to an insulin pen of the injection device, wherein the needle holder (1) is provided on its inner wall with a movement groove (11), a limiting groove (12) and a first guide slope (13), wherein the movement groove (11) is arranged to run in an axial direction of the needle holder (1), wherein the limiting groove (12) is located on one side of the upper end of the movement groove (11), wherein the limiting groove (12) is connected to the movement groove (11) via the first guide slope (13), and wherein one end of the first guide slope (13) connected to the limiting groove (12) is lower than the end of the first guide slope (13) connected to the movement groove (11); a shielding sleeve (3), wherein the shielding sleeve (3) is mounted in the needle holder (1) and is to be penetrated by the injection needle (2), wherein a limit stop (31) for insertion into the limit groove (12) is provided on a side wall of the shielding sleeve (3), wherein the limit stop (31) is located below the first guide bevel (13), wherein, when the needle holder (1) is mounted on the insulin pen, the shielding sleeve (3) rests against the insulin pen and is moved upwards so that the limit stop (31) in the limit groove (12) can reach the movement groove (11) along the first guide bevel (13), and wherein, when the needle holder (1) is separated from the insulin pen, the limit stop (31) is moved downwards along the movement groove (11) so that the shielding sleeve (3) covers or shields the lower end of the injection needle (2); wherein the needle holder (1) has a hollow structure with an opening at the lower end, wherein the shielding sleeve (3) is slidably disposed in the needle holder (1) through the open end of the needle holder (1), wherein a spring (4) is provided between an inner upper wall of the needle holder (1) and the shielding sleeve (3), and wherein the spring (4) is in a compressed state when the limit stop (31) is located in the limiting groove (12); characterized bythat a shoulder (32) is provided on the side wall of the shielding sleeve (3), wherein the shoulder (32) is provided with a second guide bevel (321) on its upper end surface, wherein a downwardly opening placement groove (14) is provided on the edge of the open end of the needle holder (1), wherein the placement groove (14) is provided with a third guide bevel (141) on its inner upper wall, wherein the second guide bevel (321), the third guide bevel (141) and the first guide bevel (13) extend in the circumferential direction of the needle holder (1) and are inclined in the same direction and at the same angle, wherein, when the limit stop (31) is located in the limit groove (12), the shoulder (32) is located below the needle holder (1), and wherein, when the limit stop (31) moves from the limit groove (12) into the movement groove (11),the shoulder (32) is accommodated in the placement groove (14) and the second guide bevel (321) and the third guide bevel (141) abut each other., [2] Device for shielding the lower end of an injection needle according to claim 1, characterized byin that a fourth guide bevel (311) is provided on a side of the limit stop (31) facing away from the movement groove (11), wherein a fifth guide bevel (111) is provided at the connection point between the movement groove (11) and the limit groove (12), wherein the lower end of the fifth guide bevel (111) is closer to the movement groove (11) than the upper end, wherein the fourth guide bevel (311) and the fifth guide bevel (111) are parallel to one another, wherein, when the limit stop (31) is moved downwards along the movement groove (11) and is guided through the connection point between the movement groove (11) and the limit groove (12), the fourth guide bevel (311) is used to bear against the fifth guide bevel (111). [3] Device for shielding the lower end of an injection needle according to claim 2, characterized bythat on the inner wall of the needle holder (1) there is further provided a transition groove (15) which is arranged to run in the axial direction, wherein the transition groove (15) is located above the movement groove (11) and is connected to the movement groove (11), and wherein, after the needle holder (1) is attached to the insulin pen, the limit stop (31) is located in the transition groove (15). [4] Device for shielding the lower end of an injection needle according to claim 1, characterized bythat a receiving groove (17) is further provided on the inner wall of the needle holder (1), wherein a lower portion of the moving groove (11) is connected to the receiving groove (17), wherein an elastic lever (171) is provided between the moving groove (11) and the receiving groove (17), and wherein the elastic lever (171) is inclined towards the moving groove (11) and is used to move back and forth between the moving groove (11) and the receiving groove (17). [5] Device for shielding the lower end of an injection needle according to claim 4, characterized by that the lower end of the elastic lever (171) is inclined in the direction of the movement groove (11), wherein the distance between the lower end of the elastic lever (171) and the side wall of the movement groove (11) facing away from the receiving groove (17) is smaller than the width of the limit stop (31). [6] Device for shielding the lower end of an injection needle according to one of claims 1 to 5, characterized by that a mounting support (16) is provided in the needle holder (1), wherein the mounting support (16) is arranged on the inner upper wall of the needle holder (1), wherein the spring (4) and the shielding sleeve (3) are placed on the mounting support (16), and wherein the mounting support (16) serves for the continuous mounting of the injection needles (2). [7] Device for shielding the lower end of an injection needle according to one of claims 1 to 5, characterized byin that it further comprises a connecting seat (5), wherein the connecting seat (5) has a hollow structure with openings at the upper and lower ends, wherein the lower end of the needle holder (1) is connected to the upper end of the connecting seat (5), wherein the lower end of the shielding sleeve (3) is located in the connecting seat (5), wherein a thread is provided on the inner wall of the connecting seat (5), and wherein the connecting seat (5) is connected to the insulin pen via the thread, so that the insulin pen rests against the shielding sleeve (3) and presses the shielding sleeve (3) upwards. [8] Injection device, characterized by that it comprises an injection needle (2), an insulin pen and a device for shielding the lower end of an injection needle according to one of claims 1 to 7.

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