Disposable, two-way protective safety insulin pen needles

Abstract

This invention provides a disposable, bidirectional, protective safety insulin pen needle, comprising a housing, a connecting tube, a needle tube, an upper sheath, a lower sheath, and a needle hub. The needle hub is fixedly disposed at the bottom of the connecting tube, and the needle tube is fixedly disposed within the needle hub, with its bottom end extending through the needle hub and its top end extending into the top of the connecting tube. The upper sheath is vertically movable within the connecting tube, and the needle tube portion is housed within the upper sheath. The upper sheath moves up and down within the connecting tube to cover or expose the top end of the needle tube. The housing is fitted over the connecting tube, and the lower sheath is inserted from the bottom of the connecting tube between the housing and the connecting tube, and can move up and down along it to cover or expose the bottom end of the needle tube. The top of the connecting tube is used to insert a standard insulin pen.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to insulin injectors, and more particularly to disposable, bidirectional, protective, safe insulin pen needles. Background Technology

[0002] Insulin injectors are used to inject insulin into diabetic patients. Currently, commonly used insulin injectors consist of several parts, including a needle cap, needle, syringe, and injector. To prevent the needle from being exposed and causing the risk of cross-infection, the needle is generally protected. In existing technologies, a cap is generally used for protection, such as CN217660975U which discloses a quick-release insulin injector, in which a dust cover (7) is placed on the injection head (6) to protect the needle. Some injectors connect the needle to the syringe via a threaded connection, such as CN217219777U which discloses a telescopic insulin pen, in which the injection needle is threadedly connected to a telescopic structure; one end of the telescopic tube is connected to the injection needle, and the other end is connected to the injection structure, and the injection needle is extended or inserted by rotating the thread. Some injectors also detachably connect the needle to the syringe, and the needle is removed after use. For example, ZL202020245994.4 and ZL201821423977.4 both disclose insulin pen needle disassembly devices. In these existing technologies, only the needle is protected at one end, and the needle needs to be exposed during injection, which cannot fundamentally avoid needle exposure and eliminate cross-contamination.

[0003] Therefore, there is an urgent need to develop new insulin injectors to fundamentally solve the problem of exposed needles causing contamination. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a disposable bidirectional protective safety insulin pen needle, which solves the problem of needle tip leakage in the prior art by setting an upper sheath and a lower sheath to cover the top and bottom of the needle tube.

[0005] The technical solution of the present invention is as follows: a disposable bidirectional protective safety insulin pen needle, comprising a shell, a connecting tube, a needle tube, an upper sheath, a lower sheath, and a needle hub; the needle hub is fixedly disposed at the bottom of the connecting tube, the needle tube is fixedly disposed in the needle hub, its bottom end extends through the needle hub and out of the connecting tube, and its top end extends into the upper part of the connecting tube; the shell is sleeved on the outside of the connecting tube, the lower sheath is inserted from the bottom of the connecting tube between the shell and the connecting tube, and can move bidirectionally along it, thereby covering or exposing the bottom end of the needle tube through the lower sheath; the upper sheath is disposed inside the connecting tube, the needle tube is partially housed in the upper sheath, and the upper sheath is triggered during the movement of the lower sheath toward the top end of the needle tube, after being triggered, the upper sheath can move toward the top end of the needle tube, thereby covering it.

[0006] The connecting tube includes a plug portion and a body portion, the inner diameter of the plug portion is larger than the inner diameter of the body portion, and the two are connected in a stepped manner; the outer shell includes an upper portion and a lower portion, the inner diameter of the upper portion is larger than the inner diameter of the lower portion, and the two are connected in a stepped manner; the plug portion is housed in the upper portion, and the body portion is partially housed in the lower portion.

[0007] It also includes a rotary transducer; the rotary transducer includes a first mating ring and a second mating ring that cooperate with each other. The first mating ring is sleeved on the outside of the body. A first spring is provided between the first mating ring and the insertion part. The first spring is also sleeved on the outside of the body, and one end of it is fixed to the top surface of the first mating ring. The top of the lower sheath has a second mating ring protruding outward. The first mating ring and the second mating ring are respectively provided with a beveled tenon and a beveled groove that cooperate with each other.

[0008] The inner wall of the outer casing is provided with a first slide rail along its length direction. The first mating ring is provided with a first limiting groove corresponding to the first slide rail. The second mating ring is provided with a second limiting groove corresponding to the first slide rail. The first slide rail is accommodated in the first limiting groove and the second limiting groove, thereby restricting the lifting direction of the lower sheath and the first mating ring.

[0009] The first mating ring has a third limiting groove on the side of the first limiting groove, and a buckle is provided in the third limiting groove. The lower sleeve pushes the first mating ring and the first spring to move towards the top of the connecting tube. The first spring contacts the bottom surface of the insertion part and is compressed. When the first mating ring disengages from the first slide rail, the lower sleeve continues to move, so that when the bevel tenon enters the bevel tenon groove, it pushes the first mating ring to rotate relative to the second mating ring, causing the third limiting groove to align with the second limiting groove. The buckle in the third limiting groove abuts against the top of the first slide rail. Then the lower sleeve is released, the first spring elastically resets, and pushes the first mating ring. The second mating ring on the lower sleeve moves along the first slide rail towards the bottom of the connecting tube, thereby completing the rotational repositioning.

[0010] The body of the connecting pipe is provided with a through groove, and the inner wall of the lower sheath is provided with a second slide rail. The second slide rail is housed in the through groove and moves up and down within it, thereby limiting the up and down direction of the lower sheath.

[0011] The upper sheath has a sleeve and a top plate disposed on the top of the sleeve; the inner wall of the body of the connecting pipe has a first mounting ring and a second mounting ring disposed vertically, and a second spring is sleeved outside the sleeve, with its two ends respectively mounted on the top plate and the first mounting ring, thereby supporting the upper sheath inside the connecting pipe.

[0012] The outer wall of the upper sheath is provided with a mating groove, in which there is an outwardly inclined elastic locking protrusion. In the initial state, the elastic locking protrusion is located below the second mounting ring and is blocked by the second mounting ring, so that the upper sheath cannot move towards the top of the needle tube. The top of the second slide rail is provided with an inclined surface. When the lower sheath moves towards the top of the needle tube until the inclined surface of the second slide rail contacts the elastic locking protrusion and pushes it into the mating groove, the second mounting ring is released from blocking the elastic locking protrusion. This allows the upper sheath to move towards the top of the needle tube under the push of the second spring, moving the elastic locking protrusion above the second mounting ring and blocking it with the first mounting ring, so that it cannot fall off the connecting ring.

[0013] The first mounting ring has a first notch, and the second mounting ring has a second notch; the first notch and the second notch allow the second slide rail to pass through.

[0014] The top plate is provided with a limiting post in the circumferential direction. The limiting post is inserted into the through groove to limit the lifting direction of the upper sheath and prevent it from deviating. The top plate is provided with a needle hole for the needle tube to pass through.

[0015] The beneficial effects of this invention are as follows: The disposable bidirectional protective safety insulin pen needle of this invention, through the first spring pushing the upper sheath and the second spring pushing the lower sheath, can automatically cover and expose the needle tips at both ends of the needle tube, avoiding contamination. The disposable bidirectional protective safety insulin pen needle of this invention also includes a rotary switch, ensuring that the bidirectional protective safety insulin pen needle can be used only once, avoiding reuse and the risk of disease transmission. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the disposable bidirectional protective safety insulin pen needle described in this invention.

[0017] Figure 2 For along Figure 1 Cross-sectional view along the AA line. This figure shows the initial state of the disposable, two-way protective safety insulin pen needle.

[0018] Figure 3 This is a schematic diagram of the structure of the disposable bidirectional protective safety insulin pen needle insertion pen described in this invention.

[0019] Figure 4 for Figure 3 A bottom view.

[0020] Figure 5 For along Figure 4A cross-sectional view along the CC line. This figure shows the state after the insulin pen is inserted into the connector, before the lower and upper sheaths are triggered.

[0021] Figure 6 for Figure 5 Enlarged view at point D.

[0022] Figure 7 yes Figure 1 The exploded diagram.

[0023] Figure 8 yes Figure 7 A sectional view.

[0024] Figure 9 yes Figure 1 A structural diagram from another angle after removing the outer shell 10.

[0025] Figure 10 It is along Figure 3 A cross-sectional view along the BB line.

[0026] Figure 11 yes Figure 10 Enlarged view at point F.

[0027] Figure 12 This is a schematic diagram of the structure of the disposable bidirectional protective safety insulin pen needle after rotation and repositioning. For clarity, the outer shell has been removed.

[0028] Figure 13 This is a structural view of the disposable bidirectional protective safety insulin pen needle after use. In this figure, the upper sheath protects the top of the needle tube, and the lower sheath protects the bottom of the needle tube. Detailed Implementation

[0029] To make the objectives, technical solutions, and effects of this invention clearer, the invention will be further described below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] Reference Figures 1-5A disposable, two-way protective safety insulin pen needle, comprising a housing 10, a connecting tube 20, a needle tube 30, an upper sheath 40, a lower sheath 50, and a needle hub 60. The needle hub 60 is fixedly disposed at the bottom of the connecting tube 20, and the needle tube 30 is fixedly disposed in the needle hub 60. Its bottom end 31 extends out of the connecting tube 20 through the needle hub 60, and its top end 32 extends into the upper part of the connecting tube 20. The outer shell 10 is sleeved on the outside of the connecting tube 20. The lower sheath 50 is inserted from the bottom of the connecting tube 20 between the outer shell 10 and the connecting tube 20 and can move in both directions along it, thereby covering or exposing the bottom end 31 of the needle tube 30. The upper sheath 40 is unidirectionally movable inside the connecting tube 20. The needle tube 30 is partially housed in the upper sheath 40. During the movement of the lower sheath 50 toward the top end 32 of the needle tube 30, the upper sheath 40 is triggered. After being triggered, the upper sheath 40 moves toward the top end 32 of the needle tube 30, thereby covering it. The top of the connecting tube 20 is used to insert a standard insulin pen 70. When using the disposable bidirectional protective safety insulin pen needle, the insulin pen 70 is inserted into the connecting tube 20, and the tip 32 of the needle tube 30 is inserted into the insulin pen 70 to draw up the medication and transport it to the bottom 31 of the needle tube 30. The lower sheath 50 contacts the human body and is pushed towards the tip 32 of the needle tube 30, so that the bottom 31 of the needle tube 30 is exposed by the lower sheath 50, thereby allowing it to be inserted into the human body for injection. During the process of pushing the lower sheath 50 towards the tip 32 of the needle tube 30, the upper sheath 40 is triggered. After the injection is completed, the insulin pen 70 is removed, and the upper sheath 40 moves towards the tip 32 of the needle tube 30 to cover it. The lower sheath 50 moves towards the bottom 31 of the needle tube 30 to cover it.

[0031] It should be understood that the insulin pen 70 is a standard insulin pen. Its structure and principle are well known to those skilled in the art and will not be described in detail here. To increase the versatility of the disposable bidirectional protective safety insulin pen needle, the following connector 22 of the connecting tube 20 adopts a universal size and structure that can be adapted to the standard insulin pen 70.

[0032] Reference Figure 2The connecting tube 20 includes a body 21 and a plug-in portion 22. The inner diameter of the plug-in portion 22 is larger than the inner diameter of the body 21, and the two are connected in a stepped manner. The outer shell 10 can be made of transparent or opaque material, preferably transparent material, to facilitate observation of internal components. The outer shell 10 includes an upper part 10a and a lower part 10b. The inner diameter of the upper part 10a is larger than the inner diameter of the lower part 10b, and the two are connected in a stepped manner. The plug-in portion 22 is accommodated in the upper part 10a. The body 21 is partially accommodated in the lower part 10b. The outer wall of the plug-in portion 22 and the inner wall of the upper part 10a are respectively provided with a cooperating outer protruding ring 221 and an inner protruding ring 11, which cooperate to prevent the connecting tube 20 from falling out of the outer shell 10.

[0033] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 9 and Figure 12The disposable bidirectional protective safety insulin pen needle also includes a rotary switch 80. The rotary switch 80 includes a first mating ring 81 and a second mating ring 82 that cooperate with each other. The first mating ring 81 is movably sleeved on the body 21. A first spring 83 is provided between the first mating ring 81 and the insertion part 22. The first spring 83 is also sleeved on the body 21, and one end of it is fixed to the top surface of the first mating ring 81. The top of the lower sheath 50 has the second mating ring 82 protruding outward. The first mating ring 81 and the second mating ring 82 are respectively provided with a beveled tenon 811 and a beveled groove 821 that cooperate with each other. A first slide rail 12 is provided on the inner wall of the lower part 10b of the outer casing 10 along its length direction. The first mating ring 81 is provided with a first limiting groove 812 corresponding to the first slide rail 12, and the second mating ring 82 is provided with a second limiting groove 822 corresponding to the first slide rail 12. The first slide rail 12 is accommodated in the first limiting groove 812 and the second limiting groove 822, thereby restricting the lifting direction of the lower sheath 50 and the first mating ring 81. The first mating ring 81 is provided with a third limiting groove 814 on the side of the first limiting groove 812, and a buckle 815 is provided in the third limiting groove 814. The lower sheath 50 pushes the first mating ring 81 and the first spring 83 to move towards the top end of the connecting pipe 20. Spring 83 contacts the bottom surface of the insertion part 22 and is compressed. When the first mating ring 81 disengages from the first slide rail 12, the lower sleeve 50 continues to move, causing the bevel tenon 811 to move into the bevel tenon groove 821 and push the first mating ring 81 to rotate relative to the second mating ring 82, causing the third limiting groove 814 to align with the second limiting groove 822, and the buckle 815 in the third limiting groove 814 abuts against the top of the first slide rail 12. Then the lower sleeve 50 is released, the first spring 83 elastically returns to its original position, and pushes the first mating ring 81. The second mating ring 82 on the lower sleeve 50 moves along the first slide rail 12 toward the bottom end of the connecting pipe 20, thereby completing the rotational repositioning. It should be understood that in order for the rotational transposition to be completed, the distance between the top of the first slide rail 12 and the bottom surface of the insertion part 22 should be appropriately set. It must be able to satisfy the compression of the first spring 83, the disengagement of the first mating ring 81 from the first slide rail 12, and the distance required for "when the oblique tenon 811 moves into the oblique tenon groove 821, it pushes the first mating ring 81 to rotate relative to the second mating ring 82".

[0034] A baffle plate 13 protrudes inward from the bottom end of the outer shell 10, and the bottom end of the first slide rail 12 is fixed to the baffle plate 13. When the second mating ring 82 moves to the baffle plate 13, it is blocked by the baffle plate 13, thereby preventing the lower sheath 50 from detaching from the outer shell 10.

[0035] Reference Figure 6 , Figure 7 and Figure 8 The body 21 of the connecting pipe 20 is provided with a through groove 23, and the inner wall of the lower sheath 50 is provided with a second slide rail 51. The second slide rail 51 is inserted into the through groove 23 and moves up and down within it, thereby restricting the lifting direction of the lower sheath 50.

[0036] Reference Figure 2 The needle holder 60 and the connecting tube 20 are respectively provided with a matching second slot 61 and a second protrusion 24 at their bottoms, thereby fixing the needle holder 60 to the connecting tube 20. It should be understood that the needle holder 60 may also be integrally formed with the bottom of the connecting tube 20, or connected by other means, such as a snap fastener 815, screws, or other conventional methods. This invention does not limit the scope of the invention.

[0037] Reference Figure 2 The needle holder 60 has a guide post 62 on its upper part, and the needle tube 30 is fixed to the guide post 62. The guide post 62 fixes the needle tube 30 and prevents the needle tube 30 from shaking.

[0038] Reference Figure 6 , Figure 7 , Figure 8 and Figure 11The upper sheath 40 has a sleeve 41 and a top plate 42 disposed on the top of the sleeve 41. The inner wall of the body 21 of the connecting tube 20 has a first mounting ring 25 and a second mounting ring 26 disposed vertically. A second spring 46 is sleeved on the outside of the sleeve 41, with its two ends respectively mounted on the top plate 42 and the first mounting ring 25, thereby supporting the upper sheath 40 within the connecting tube 20. The outer wall of the upper sheath 40 has a mating groove 47, in which an outwardly inclined elastic locking protrusion 45 is provided. In the initial state, the elastic locking protrusion 45 is located below the second mounting ring 26 and is blocked by the second mounting ring 26, preventing the upper sheath 40 from moving towards the top 32 of the needle tube 30. The top of the second slide rail 51 has an inclined surface 52. When the lower sheath 50 moves towards the top 32 of the needle tube 30 until the inclined surface 52 of the second slide rail 51 contacts the elastic locking protrusion 45 and pushes it into the mating groove 47, the second mounting ring 26 stops the second mounting ring 26 from blocking the elastic locking protrusion 45. This allows the upper sheath 40 to move towards the top 32 of the needle tube 30 under the push of the second spring 46, moving the elastic locking protrusion 45 above the second mounting ring 26. At this time, if the insulin pen 70 is inserted into the insertion part 22, the upper sheath 40 is again blocked by the insulin pen 70 and cannot enter the insertion part 22. When the insulin pen 70 is removed, the second spring 46 pushes the top plate 42, pushing the upper sheath 40 into the insertion part 22, covering the top 32 of the needle tube 30 so that it is not exposed.

[0039] The first mounting ring 25 has a first notch 251, and the second mounting ring 26 has a second notch 261. The first notch 251 and the second notch 261 allow the second slide rail 51 to pass through.

[0040] The top plate 42 is provided with a limiting post 43 in the circumferential direction. The limiting post 43 is inserted into the through groove 23, thereby restricting the lifting direction of the upper protective sleeve 40 and preventing it from deviating. The top plate 42 is provided with a needle hole 44 for the needle tube 30 to pass through.

[0041] Reference Figure 2In the initial state of the disposable bidirectional protective safety insulin pen needle described in this invention, the insulin pen 70 has not yet been inserted into the insertion portion 22 of the connector 20. At this time, the top 32 of the needle tube 30 is located in the insertion portion 22 of the connector 20. The bottom of the lower sheath 50 covers the bottom 32 of the needle tube 30, and the second limiting groove 822 on the second mating ring 82 on the lower sheath 50 is aligned with the first limiting groove 812 on the first mating ring 81. The first slide rail 12 should be inserted into the second limiting groove 822 and the first limiting groove 812 at this time. The elastic locking protrusion 45 on the upper sheath 40 is located below the second mounting ring 26 on the inner wall of the connector 20 and is blocked by it, preventing it from moving towards the top 32 of the needle tube 30.

[0042] Reference Figure 2 , Figure 5 and Figure 6 When the insulin pen 70 is inserted into the connector 22, the top 32 of the needle 30 is inserted into the insulin pen 70 to draw up the medication and transport it to the bottom 31 of the needle 30. At this time, the upper sheath 40 and the rotary switch 80 of the disposable bidirectional protective insulin pen needle have not yet been triggered.

[0043] Reference Figure 10 , Figure 11 and Figure 12 During injection, the lower sheath 50 contacts the skin and is pushed along the first slide rail 12 towards the top 32 of the needle tube 30. When the inclined surface 52 of the second slide rail 51 on the lower sheath 50 contacts the elastic locking protrusion 45 on the outer wall of the upper sheath 40 and pushes it into the mating groove 47, the second mounting ring 26 is released from blocking the elastic locking protrusion 45. This allows the upper sheath 40 to move towards the top 32 of the needle tube 30 under the push of the second spring 46, moving the elastic locking protrusion 45 above the second mounting ring 26. At this time, because the insulin pen 70 is inserted into the insertion part 22, it blocks the upper sheath 40, preventing it from entering the insertion part 22.

[0044] The lower sheath 50 continues to push the first mating ring 81 to move synchronously toward the top 32 of the needle tube 30. The first spring 83 is compressed. When the first limiting groove 812 of the first mating ring 81 disengages from the first slide rail 12, the lower sheath 50 continues to move toward the top 32 of the needle tube 30, so that the oblique tenon 811 is fully inserted into the oblique tenon groove 821, and pushes the first mating ring 81 to rotate, so that the third limiting groove 814 aligns with the first limiting groove 812. At this time, the bottom 31 of the needle tube 30 has extended out of the lower sheath 50 and pierced the skin, and insulin injection can be completed.

[0045] Reference Figure 13 After injection, the disposable bidirectional protective safety insulin pen needle is removed from the injection site. At this time, there is no obstruction at the bottom of the lower sheath 50. Under the push of the first spring 83, the first mating ring 81 and the lower sheath 50 move towards the bottom 31 of the needle tube 30. The first slide rail 12 is inserted into the third limiting groove 814 and the first limiting groove 812 to guide the movement direction. The lower sheath 50 covers the bottom 31 of the needle tube 30 again. Then, the insulin pen 70 is removed from the insertion tube 22 of the connector 20. There is no obstruction at the top of the upper sheath 40. Under the push of the second spring 46, the upper sheath 40 moves towards the top 32 of the needle tube 30. The upper sheath 40 enters the insertion part 22 and covers the top 32 of the needle tube 30 again. Furthermore, the first mounting ring 25 blocks the elastic locking protrusion 45, thereby preventing the upper sheath 40 from falling off the connector 20.

[0046] After the disposable bidirectional protective safety insulin pen needle is used once, the elastic protrusion 45 of the upper sheath 40 is blocked by the first mounting ring 25 and cannot detach from the connector 20, and is blocked by the second mounting ring 26 and cannot be reset. The lower sheath cannot be rotated again because the rotary positioner 80 has already completed the rotation and repositioning. Therefore, the bidirectional protective safety insulin pen needle cannot be used again, thus avoiding repeated use and the spread of disease.

[0047] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the invention to these descriptions. For those skilled in the art, the architectural form of this invention can be flexibly varied without departing from its conceptual framework, leading to the derivation of a series of products. Any simple deductions or substitutions should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. A disposable, bidirectional, protective safety insulin pen needle, characterized in that: The device includes an outer shell, a connecting tube, a needle tube, an upper sheath, a lower sheath, and a needle hub. The needle hub is fixedly disposed at the bottom of the connecting tube, and the needle tube is fixedly disposed in the needle hub, with its bottom end extending through the needle hub and out of the connecting tube, and its top end extending into the upper part of the connecting tube. The outer shell is fitted over the connecting tube, and the lower sheath is inserted from the bottom of the connecting tube between the outer shell and the connecting tube, and can move bidirectionally along it, thereby covering or exposing the bottom end of the needle tube through the lower sheath. The upper sheath is disposed inside the connecting tube, and the needle tube is partially housed within the upper sheath. During the movement of the lower sheath towards the top end of the needle tube, the upper sheath is triggered, and after being triggered, the upper sheath can move towards the top end of the needle tube, thereby covering it. The connecting tube includes a plug portion and a body portion, the inner diameter of the plug portion is larger than the inner diameter of the body portion, and the two are connected in a stepped manner; the outer shell includes an upper portion and a lower portion, the inner diameter of the upper portion is larger than the inner diameter of the lower portion, and the two are connected in a stepped manner; the plug portion is housed in the upper portion, and the body portion is partially housed in the lower portion; The body of the connecting pipe is provided with a second through groove, and the inner wall of the lower sheath is provided with a second slide rail. The second slide rail is housed in the second through groove and moves up and down within it, thereby limiting the up and down direction of the lower sheath. The upper sheath has a sleeve and a top plate disposed on the top of the sleeve; the inner wall of the body of the connecting pipe has a first mounting ring and a second mounting ring disposed vertically, and a second spring is sleeved outside the sleeve, with its two ends respectively mounted on the top plate and the first mounting ring, thereby mounting the upper sheath inside the connecting pipe. The outer wall of the upper sheath is provided with a mating groove, in which there is an outwardly inclined elastic locking protrusion. In the initial state, the elastic locking protrusion is located below the second mounting ring and is blocked by the second mounting ring, so that the upper sheath cannot move towards the top of the needle tube. The top of the second slide rail is provided with an inclined surface. When the lower sheath moves towards the top of the needle tube until the inclined surface of the second slide rail contacts the elastic locking protrusion and pushes it into the mating groove, the second mounting ring is released from blocking the elastic locking protrusion. This allows the upper sheath to move towards the top of the needle tube under the push of the second spring, moving the elastic locking protrusion above the second mounting ring and blocking it with the first mounting ring, so that it cannot fall off the connecting ring.

2. The disposable bidirectional protective safety insulin pen needle according to claim 1, characterized in that, It also includes a rotary transducer; the rotary transducer includes a first mating ring and a second mating ring that cooperate with each other. The first mating ring is sleeved on the outside of the body. A first spring is provided between the first mating ring and the insertion part. The first spring is also sleeved on the outside of the body, and one end of it is fixed to the top surface of the first mating ring. The top of the lower sheath has a second mating ring protruding outward. The first mating ring and the second mating ring are respectively provided with a beveled tenon and a beveled groove that cooperate with each other.

3. The disposable bidirectional protective safety insulin pen needle according to claim 2, characterized in that, The inner wall of the outer casing is provided with a first slide rail along its length direction. The first mating ring is provided with a first limiting groove corresponding to the first slide rail. The second mating ring is provided with a second limiting groove corresponding to the first slide rail. The first slide rail is accommodated in the first limiting groove and the second limiting groove, thereby restricting the lifting direction of the lower sheath and the second mating ring.

4. The disposable bidirectional protective safety insulin pen needle according to claim 3, characterized in that, The second mating ring has a third limiting groove on the side of the first limiting groove, and a buckle is provided in the third limiting groove. The lower sleeve pushes the first mating ring and the first spring to move towards the top of the connecting tube. The first spring contacts the bottom surface of the insertion part and is compressed. When the first mating ring disengages from the first slide rail, the lower sleeve continues to move, so that when the bevel tenon enters the bevel tenon groove, it pushes the first mating ring to rotate relative to the second mating ring, causing the third limiting groove to align with the first limiting groove. The buckle in the third limiting groove abuts against the top of the first slide rail. Then the lower sleeve is released, the first spring elastically resets, and pushes the first mating ring. The second mating ring on the lower sleeve moves along the first slide rail towards the bottom of the connecting tube, thereby completing the rotational repositioning.

5. The disposable bidirectional protective safety insulin pen needle according to claim 1, characterized in that, The first mounting ring has a first notch, and the second mounting ring has a second notch; the first notch and the second notch allow the second slide rail to pass through.

6. The disposable bidirectional protective safety insulin pen needle according to claim 5, characterized in that, The top plate is provided with a limiting post in the circumferential direction. The limiting post is inserted into the second through groove to limit the lifting direction of the upper sheath and prevent it from deviating. The top plate is provided with a needle hole for the needle tube to pass through.

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