CN219941453U - Disposable bidirectional protection safety insulin pen needle - Google Patents

Abstract

The utility model provides a disposable bidirectional protection safety insulin pen needle, which comprises a shell, a connecting pipe, a needle tube, an upper sheath, a lower sheath and a needle seat; the needle seat is fixedly arranged at the bottom of the connecting pipe, the needle tube is fixedly arranged in the needle seat, the bottom end of the needle tube penetrates through the needle seat to extend out of the connecting pipe, and the top end of the needle tube extends into the top of the connecting pipe; the upper sheath is arranged in the connecting pipe in a lifting manner, the needle tube part is accommodated in the upper sheath, and the upper sheath is lifted in the connecting pipe, so that the top end of the needle tube is covered or leaked out of the upper sheath; the shell is sleeved outside the connecting pipe, and the lower sheath is inserted between the shell and the connecting pipe from the bottom of the connecting pipe and can be lifted along the connecting pipe, so that the bottom end of the needle tube is covered or the lower sheath is leaked out; the top of the connecting pipe is used for being inserted with a standard insulin pen.

Description

Disposable bidirectional protection safety insulin pen needle

Technical Field

The utility model relates to the technical field of medical appliances, in particular to an insulin syringe, and especially relates to a disposable bidirectional protection safety insulin pen needle.

Background

Insulin syringes are used to inject insulin for diabetics. Currently, the common insulin register consists of a needle cap, a needle head, a syringe, a propeller and the like. To prevent exposure of the needle and the risk of cross-infection, the needle is generally protected. In the prior art, a cap is generally used for protection, for example, CN217660975U discloses a quick-release insulin syringe, wherein the scheme is that a dustproof cover (7) covers and covers an injection head (6) to protect the needle head. Also, the needle is rotationally connected with the needle cylinder through threads, for example, CN217219777U discloses a telescopic insulin injection pen, and in the technical scheme, the injection needle is in threaded connection with a telescopic structure; one end of the telescopic tube is connected with the injection needle, the other end of the telescopic tube is connected with the injection structure, and the injection needle is stretched out or stretched in through threaded rotation. The needle is also detachably connected with the syringe, and the needle is taken down after the syringe is used up. For example, ZL202020245994.4 and ZL201821423977.4 both disclose insulin pen needle removers. In the prior art, the needle heads are protected by a single head, and in the injection process, the needle heads are required to be exposed, so that the exposure of the needle heads cannot be fundamentally avoided, and the cross contamination is avoided.

For this reason, there is a need to develop new insulin syringes to fundamentally solve the problem of pollution caused by exposed needle.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides a disposable two-way protection safety insulin pen needle, and the problem of leakage of the needle tip in the prior art is solved by arranging an upper sheath and a lower sheath to cover the top and the bottom of a needle tube.

The technical scheme of the utility model is as follows: the disposable bidirectional protective safety insulin pen needle comprises a shell, a connecting pipe, a needle tube, an upper sheath, a lower sheath and a needle seat; the needle seat is fixedly arranged at the bottom of the connecting pipe, the needle tube is fixedly arranged in the needle seat, the bottom end of the needle tube penetrates through the needle seat to extend out of the connecting pipe, and the top end of the needle tube extends into the upper part of the connecting pipe; the shell is sleeved outside the connecting pipe, and the lower sheath is inserted between the shell and the connecting pipe from the bottom of the connecting pipe and can move bidirectionally along the connecting pipe, so that the bottom end of the needle tube is covered or the needle tube leaks out of the lower sheath; the upper sheath is arranged in the connecting pipe, the needle tube part is accommodated in the upper sheath, the upper sheath is triggered in the process that the lower sheath moves towards the top end of the needle tube, and the upper sheath can move towards the top end of the needle tube after being triggered, so that the needle tube is covered.

The connecting pipe comprises a plug-in connection part and a body part, wherein the inner diameter of the plug-in connection part is larger than that of the body part, and the plug-in connection part and the body part are connected in a step shape; the shell comprises an upper part and a lower part, wherein the inner diameter of the upper part is larger than that of the lower part, and the upper part and the lower part are connected in a step shape; the plug-in part is accommodated in the upper part, and the body part is accommodated in the lower part.

The device also comprises a rotary transposer; the rotary transposer comprises a first matching ring and a second matching ring which are matched with each other, the first matching ring is sleeved outside the body, a first spring is arranged between the first matching ring and the plug-in part, the first spring is sleeved outside the body, and one end of the first spring is fixedly connected with the top surface of the first matching ring; the top of the lower sheath is outwards convexly provided with the second matching ring, and the first matching ring and the second matching ring are respectively provided with a bevel tenon and a bevel mortise which are matched with each other.

The inner wall of the shell is provided with a first sliding rail along the length direction of the first sliding rail, the first matching ring is provided with a first limiting groove corresponding to the first sliding rail, the second matching ring is provided with a second limiting groove corresponding to the first sliding rail, and the first sliding rail is accommodated in the first limiting groove and the second limiting groove, so that the lifting direction of the lower sheath and the second matching ring is limited.

The second matching ring is provided with a third limit groove beside the first limit groove, and a buckle is arranged in the third limit groove; the lower sheath pushes the first matching ring and the first spring to move towards the top end direction of the connecting pipe, the first spring contacts the bottom surface of the inserting part and is compressed, when the first matching ring is separated from the first sliding rail, the lower sheath continues to move, so that when the bevel tenon enters the bevel tenon groove, the first matching ring is pushed to rotate relative to the second matching ring, the third limiting groove is enabled to be aligned with the first limiting groove, a buckle in the third limiting groove abuts against the top of the first sliding rail, then the lower sheath is released, the first spring elastically resets and pushes the first matching ring, and the second matching ring on the lower sheath moves towards the bottom end direction of the connecting pipe along the first sliding rail, so that rotary transposition is completed.

The body of connecting pipe is equipped with the second through groove, be equipped with the second slide rail on the inner wall of lower sheath, the second slide rail holding in the second through groove to lift and remove in it, thereby restriction lower sheath's lift direction.

The upper sheath is provided with a sleeve and a top plate arranged at the top of the sleeve; the connecting pipe is characterized in that a first mounting ring and a second mounting ring which are arranged up and down are arranged on the inner wall of the body of the connecting pipe, a second spring is sleeved outside the sleeve, and two ends of the second spring are respectively arranged on the top plate and the first mounting ring, so that the upper sheath is erected in the connecting pipe.

The outer wall of the upper sheath is provided with a matching groove, and an inclined outward elastic clamping protrusion is arranged in the matching groove; in the initial state, the elastic clamp is convexly arranged 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 second slide rail is equipped with a inclined plane, when the lower sheath to the top direction of needle tubing removes to the inclined plane of second slide rail contacts the elasticity card is protruding and with it promotes to in the cooperation groove, thereby relieve the second collar is to the protruding blocking of elasticity card makes the upper sheath can be under the promotion of second spring down the top direction of needle tubing removes, will the elasticity card is protruding to second collar top, and is blocked by first collar, and can not follow in the go-between drops.

The first mounting ring is provided with a first notch, and the second mounting ring is provided with a second notch; the first notch and the second notch are used for the second sliding rail to pass through.

A limiting column is arranged on the circumferential direction of the top plate and is inserted into the second through groove, so that the lifting direction of the upper sheath is limited and deflection of the upper sheath is prevented; a pinhole is arranged on the top plate for the needle tube to pass through.

The beneficial effects of the utility model are as follows: according to the disposable bidirectional protection safety insulin pen needle, the upper sheath is pushed by the first spring, and the lower sheath is pushed by the second spring, so that the needle can automatically cover and expose the needle points at two ends of the needle tube, and pollution is avoided. The disposable bidirectional protection safety insulin pen needle is also provided with the rotary transposition device, so that the bidirectional protection safety insulin pen needle can be used only once, and the disease infection caused by repeated use is avoided.

Description of the drawings:

fig. 1 is a schematic diagram of the structure of the disposable bi-directional protection safety insulin pen needle according to the present utility model.

Fig. 2 is a cross-sectional view taken along line A-A of fig. 1. The figure shows the initial state of the single-use bi-directional protective safety insulin pen needle.

Fig. 3 is a schematic diagram of the structure of the disposable bi-directional protection safety insulin pen needle insertion insulin pen according to the present utility model.

Fig. 4 is a bottom view of fig. 3.

Fig. 5 is a cross-sectional view taken along line C-C of fig. 4. The figure shows the state that the lower sleeve and the upper sleeve have not been triggered after the insulin pen is inserted into the insertion part.

Fig. 6 is an enlarged view at fig. 5D.

Fig. 7 is an exploded view of fig. 1.

Fig. 8 is a cross-sectional view of fig. 7.

Fig. 9 is a schematic view of the structure of fig. 1 from another angle, with the housing 10 removed.

Fig. 10 is a cross-sectional view taken along line 3B-B.

Fig. 11 is an enlarged view at fig. 10F.

Fig. 12 is a schematic view of the disposable bi-directional protection safety insulin pen needle after rotational indexing, with the housing removed for clarity of illustration.

Fig. 13 is a structural view of the single-use bi-directional protection safety insulin pen needle after use, in which the upper shield protects the top of the needle cannula and the lower shield protects the bottom of the needle cannula.

Detailed Description

In order to make the technical scheme and technical effects of the utility model more clear, the utility model is further described below with reference to specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1 to 5, the disposable bi-directional protective safety insulin pen needle includes a housing 10, a connection tube 20, a needle tube 30, an upper sheath 40, a lower sheath 50 and a needle holder 60. The needle seat 60 is fixedly arranged at the bottom of the connecting pipe 20, the needle tube 30 is fixedly arranged in the needle seat 60, the bottom end 31 of the needle tube 30 penetrates through the needle seat 60 to extend out of the connecting pipe 20, and the top end 32 of the needle tube extends into the upper part of the connecting pipe 20; the shell 10 is sleeved outside the connecting pipe 20, and the lower sheath 50 is inserted between the shell 10 and the connecting pipe 20 from the bottom of the connecting pipe 20 and can move bidirectionally along the shell, so that the bottom end 31 of the needle tube 30 is covered or leaked out of the lower sheath 50; the upper sheath 40 is unidirectionally movably arranged in the connecting pipe 20, the needle tube 30 is partially accommodated in the upper sheath 40, the upper sheath 40 is triggered in the process of moving the lower sheath 50 towards the top end 32 of the needle tube 30, and the upper sheath 40 is triggered to move towards the top end 32 of the needle tube 30 so as to cover the needle tube 30; the top of the connection tube 20 is used for plugging a standard insulin pen 70. When the disposable two-way protective safety insulin pen needle is used, the insulin pen 70 is inserted into the connecting pipe 20, the top end 32 of the needle tube 30 is inserted into the insulin pen 70, and medicines are sucked and conveyed to the bottom end 31 of the needle tube 30; the lower sheath 50 contacts the human body and is pushed toward the top end 32 of the needle tube 30, so that the bottom end 31 of the needle tube 30 is exposed out of the lower sheath 50, thereby being capable of penetrating into the human body to realize injection; triggering the upper shield 40 while the lower shield 50 is being pushed toward the tip 32 of the needle cannula 30; after the injection is completed, the insulin pen 70 is removed, and the upper sheath 40 is moved toward the tip 32 of the needle tube 30, thereby covering it; the lower sheath 50 moves toward the bottom end 31 of the needle cannula 30 to cover it.

It should be appreciated that the insulin pen 70 is a standard insulin pen. The structure and principle are well known to those skilled in the art and will not be described in detail herein. To increase the versatility of the single-use bi-directional protective safety insulin pen needle, the following mating portion 22 of the connector tube 20 is of a general size and configuration that can be adapted to a standard insulin pen 70.

Referring to fig. 2, the connection pipe 20 includes a body 21 and a socket 22, wherein the socket 22 has an inner diameter larger than that of the body 21, and the two parts are connected in a stepped manner. The housing 10 may be made of transparent or opaque materials, preferably transparent materials, so as to facilitate the observation of internal parts. The housing 10 includes an upper portion 10a and a lower portion 10b, wherein the inner diameter of the upper portion 10a is larger than the inner diameter of the lower portion 10b, and the upper portion and the lower portion are connected in a stepped manner, and the plugging portion 22 is accommodated in the upper portion 10a. The body portion is accommodated in the lower portion 10b. The outer wall of the plug-in portion 22 and the inner wall of the upper portion 10a are respectively provided with an outer convex ring 221 and an inner convex ring 11 which are matched with each other, and the two convex rings are matched with each other to prevent the connecting pipe 20 from falling off from the housing 10.

Referring to fig. 1, 2, 5, 6, 9 and 12, the single-use bi-directional protective safety insulin pen needle further includes a rotary index 80. The rotary transposer 80 comprises a first matching ring 81 and a second matching ring 82 which are matched with each other, the first matching ring 81 is sleeved outside the body part 21 in a lifting and moving manner, a first spring 83 is arranged between the first matching ring 81 and the plug part 22, the first spring 83 is sleeved outside the body part 21, and one end of the first spring 83 is fixedly connected with the top surface of the first matching ring 81; the top of the lower sheath 50 is provided with the second mating ring 82 in an outward protruding manner, and the first mating ring 81 and the second mating ring 82 are respectively provided with a diagonal tenon 811 and a diagonal tenon slot 821 which are mutually matched. A first sliding rail 12 is arranged on the inner wall of the lower portion 10b of the housing 10 along the length direction thereof, a first limiting groove 812 corresponding to the first sliding rail 12 is arranged on the first matching ring 81, a second limiting groove 822 corresponding to the first sliding rail 12 is arranged on the second matching ring 82, and the first sliding rail 12 is accommodated in the first limiting groove 812 and the second limiting groove 822, so that the lifting direction of the lower sheath 50 and the second matching ring 82 is limited; the second matching ring 82 is provided with a third limiting groove 814 beside the first limiting groove 812, and a buckle 815 is arranged in the third limiting groove 814; the lower sheath 50 pushes the first engaging ring 81 and the first spring 83 to move towards the top end of the connecting pipe 20, the first spring 83 contacts the bottom surface of the plug-in portion 22 and is compressed, when the first engaging ring 81 is separated from the first sliding rail 12, the lower sheath 50 continues to move, so that when the bevel tongue 811 moves into the bevel tongue groove 821, the first engaging ring 81 is pushed to rotate relative to the second engaging ring 82, the third limiting groove 814 is aligned with the second limiting groove 822, the buckle 815 in the third limiting groove 814 abuts against the top of the first sliding rail 12, then the lower sheath 50 is released, the first spring 83 elastically resets and pushes the first engaging ring 81, and the second engaging ring 82 on the lower sheath 50 moves towards the bottom end of the connecting pipe 20 along the first sliding rail 12, thereby completing the rotation transposition. It should be appreciated that, in order to enable the rotational indexing to be performed, the distance between the top end of the first sliding rail 12 and the bottom surface of the plugging portion 22 should be set appropriately, so that the compression of the first spring 8 must be satisfied, and the first mating ring 81 is disengaged from the first sliding rail, so that the "when the bevel 811 moves into the bevel groove 821, the first mating ring 81 is pushed to rotate relative to the second mating ring 82" by a required distance can be achieved.

The bottom end of the shell 10 is internally provided with a baffle 13 in a protruding way, and the bottom end of the first sliding rail 12 is fixedly arranged on the baffle 13; when the second mating ring 82 moves to the abutment 13, it is blocked by the abutment 13 so that the lower sheath 50 cannot be separated from the housing 10.

Referring to fig. 6, 7 and 8, the body 21 of the connecting tube 20 is provided with a second through groove 23, the inner wall of the lower sheath 50 is provided with a second sliding rail 51, and the second sliding rail 51 is inserted into the second through groove 23 and moves up and down therein, thereby restricting the up and down direction of the lower sheath 50.

Referring to fig. 2, the needle holder 60 and the coupling tube 20 are provided at the bottoms thereof with a second catching groove 61 and a second catching protrusion 24, respectively, which are matched with each other, thereby fixing the needle holder 60 to the coupling tube 20. It should be appreciated that the hub 60 may be integrally formed with the bottom of the connector tube 20, or may be coupled by other means, such as a snap fit 815, a screw, etc., as is conventional, and the utility model is not limited thereto.

Referring to fig. 2, the needle stand 60 has a guide post 62 thereon, the needle tube 30 is fixedly disposed on the guide post 62, and the guide post 62 fixes the needle tube 30 to prevent the needle tube 30 from shaking.

Referring to fig. 6, 7, 8 and 11, the upper sheath 40 has a sleeve 41 and a top plate 42 disposed on top of the sleeve 41. The inner wall of the body 21 of the connecting pipe 20 is provided with a first mounting ring 25 and a second mounting ring 26 which are arranged up and down, a second spring 46 is sleeved outside the sleeve 41, and two ends of the second spring are respectively arranged on the top plate 42 and the first mounting ring 25, so that the upper sheath 40 is erected in the connecting pipe 20. The outer wall of the upper sheath 40 is provided with a matching groove 47, and an inclined outward elastic clamping protrusion 45 is arranged in the matching groove 47. In the initial state, the elastic latching protrusion 45 is located below the second mounting ring 26 and is blocked by the second mounting ring 26, so that the upper sheath 40 cannot move toward the top 32 of the needle tube 30. The top of the second sliding rail 51 is provided with an inclined surface 52. When the lower sheath 50 moves toward the top 32 of the needle tube 30 to the direction that the inclined surface 52 of the second slide rail 51 contacts the elastic locking protrusion 45 and pushes the elastic locking protrusion 45 into the matching groove 47, the blocking of the elastic locking protrusion 45 by the second mounting ring 26 is released, so that the upper sheath 40 can move toward the top 32 of the needle tube 30 under the pushing of the second spring 46, and the elastic locking protrusion 45 is moved above the second mounting ring 26. At this time, if the insulin pen 70 is inserted into the insertion portion 22, the upper sheath 40 is blocked by the insulin pen 70 again, and cannot enter the insertion portion 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 tip 32 of the needle tube 30 from being exposed.

The first mounting ring 25 is provided with a first notch 251, and the second mounting ring 26 is provided with a second notch 261. The first notch 251 and the second notch 261 allow the second slide rail 51 to pass through.

A limiting post 43 is provided on the top plate 42 in the circumferential direction, and the limiting post 43 is inserted into the second through groove 23, so as to limit the lifting direction of the upper sheath 40 and prevent the upper sheath from being biased. The top plate 42 is provided with a pinhole 44 for the needle tube 30 to pass through.

Referring to fig. 2, in the initial state of the single-use bi-directional protection safety insulin pen needle according to the present utility model, the insulin pen 70 is not yet inserted into the insertion part 22 of the adapter 20, and at this time, the top 32 of the needle tube 30 is positioned in the insertion part 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 of the second matching ring 82 of the lower sheath 50 aligns with the first limiting groove 812 of the first matching ring 81, and the first slide rail 12 should be inserted into the second limiting groove 822 and the first limiting groove 812 at this time. The resilient catch 45 on the upper shield 40 is located below the second collar 26 on the inner wall of the connector 20 and is blocked from moving towards the top 32 of the needle cannula 30.

Referring to fig. 2, 5 and 6, when the insulin pen 70 is inserted into the insertion part 22, the top part 32 of the needle tube 30 is inserted into the insulin pen 70, and the medicine is drawn and delivered to the bottom part 31 of the needle tube 30. At this point, both the upper sheath 40 and the rotary index 80 of the single-use bi-directional guard safety insulin pen needle have not been activated.

Referring to fig. 10, 11 and 12, during injection, the lower sheath 50 is pushed by the skin of the person to move along the first slide rail 12 toward the top 32 of the needle tube 30. When the inclined surface 52 of the second sliding rail 51 on the lower sheath 50 contacts the elastic locking protrusion 45 on the outer wall of the upper sheath 40 and pushes the elastic locking protrusion 45 into the matching groove 47, so that the blocking of the elastic locking protrusion 45 by the second mounting ring 26 is released, the upper sheath 40 moves towards the top 32 of the needle tube 30 under the pushing of the second spring 46, and the elastic locking protrusion 45 moves above the second mounting ring 26. At this time, since the insulin pen 70 is inserted into the insertion part 22, the upper sheath 40 is blocked from entering the insertion part 22.

The lower sheath 50 continues to push the first matching ring 81 to move towards the top 32 of the needle tube 30, the first spring 83 is compressed, and when the first limiting groove 812 of the first matching ring 81 is separated from the first slide rail 12; the lower sheath 50 continues to move toward the top 32 of the needle cannula 30, so that the bevel tongue 811 is fully inserted into the bevel groove 821 and pushes the first engaging ring 81 to rotate, so that the third limiting groove 814 is aligned with the first limiting groove 812, and at this time, the bottom 31 of the needle cannula 30 is extended out of the lower sheath 50 to penetrate the skin of the person, so that insulin injection can be completed.

Referring to fig. 13, after the injection is completed, the single-use bi-directional protection safety insulin pen needle is removed from the injection site, at this time, the bottom of the lower sheath 50 has no barrier, the first matching ring 81 and the lower sheath 50 move toward the bottom 31 of the needle tube 30 under the pushing of the first spring 83, the first sliding rail 12 is inserted into the third limiting groove 814 and the first limiting groove 812, and guides in alignment with the moving direction, and 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, the top of the upper sheath 40 is not blocked, the upper sheath 40 moves toward the top 32 of the needle tube 30 under the pushing of the second spring 46, the upper sheath 40 enters the insertion portion 22 to cover the top 32 of the needle tube 30 again, and the first mounting ring 25 blocks the elastic clip 45, so that the upper sheath 40 cannot be separated from the connector 20.

After the disposable bi-directional protection safety insulin pen needle is used once, the elastic clamping protrusion 45 of the upper sheath 40 is blocked by the first mounting ring 25 and cannot be separated from the connecting piece 20, and is blocked by the second mounting ring 26 and cannot be reset, and the lower sheath cannot rotate and transpose again because the rotating transposer 80 has completed rotating transposition, so that the bi-directional protection safety insulin pen needle cannot be used continuously, and disease infection caused by multiple uses is avoided.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. For those skilled in the art, the architecture of the utility model can be flexible and changeable without departing from the concept of the utility model, and serial products can be derived. But a few simple derivatives or substitutions should be construed as falling within the scope of the utility model as defined by the appended claims.

Claims (10)

1. The disposable bidirectional protection safety insulin pen needle is characterized by comprising a shell, a connecting pipe, a needle tube, an upper sheath, a lower sheath and a needle seat; the needle seat is fixedly arranged at the bottom of the connecting pipe, the needle tube is fixedly arranged in the needle seat, the bottom end of the needle tube penetrates through the needle seat to extend out of the connecting pipe, and the top end of the needle tube extends into the upper part of the connecting pipe; the shell is sleeved outside the connecting pipe, and the lower sheath is inserted between the shell and the connecting pipe from the bottom of the connecting pipe and can move bidirectionally along the connecting pipe, so that the bottom end of the needle tube is covered or the needle tube leaks out of the lower sheath; the upper sheath is arranged in the connecting pipe, the needle tube part is accommodated in the upper sheath, the upper sheath is triggered in the process that the lower sheath moves towards the top end of the needle tube, and the upper sheath can move towards the top end of the needle tube after being triggered, so that the needle tube is covered.

2. The single-use bi-directional protective safety insulin pen needle according to claim 1, wherein the connecting tube comprises a plug-in part and a body part, the plug-in part has an inner diameter larger than that of the body part, and the plug-in part and the body part are connected in a step shape; the shell comprises an upper part and a lower part, wherein the inner diameter of the upper part is larger than that of the lower part, and the upper part and the lower part are connected in a step shape; the plug-in part is accommodated in the upper part, and the body part is accommodated in the lower part.

3. The single use bi-directional protective safety insulin pen needle according to claim 2, further comprising a rotary index; the rotary transposer comprises a first matching ring and a second matching ring which are matched with each other, the first matching ring is sleeved outside the body, a first spring is arranged between the first matching ring and the plug-in part, the first spring is sleeved outside the body, and one end of the first spring is fixedly connected with the top surface of the first matching ring; the top of the lower sheath is outwards convexly provided with the second matching ring, and the first matching ring and the second matching ring are respectively provided with a bevel tenon and a bevel mortise which are matched with each other.

4. The disposable bidirectional protective safety insulin pen needle according to claim 3, wherein a first sliding rail is arranged on the inner wall of the housing along the length direction of the inner wall of the housing, a first limit groove corresponding to the first sliding rail is arranged on the first matching ring, a second limit groove corresponding to the first sliding rail is arranged on the second matching ring, and the first sliding rail is accommodated in the first limit groove and the second limit groove, so that the lifting direction of the lower sheath and the second matching ring is limited.

5. The disposable bi-directional protective safety insulin pen needle according to claim 4, wherein the second mating ring is provided with a third limiting groove beside the first limiting groove, and a buckle is arranged in the third limiting groove; the lower sheath pushes the first matching ring and the first spring to move towards the top end direction of the connecting pipe, the first spring contacts the bottom surface of the inserting part and is compressed, when the first matching ring is separated from the first sliding rail, the lower sheath continues to move, so that when the bevel tenon enters the bevel tenon groove, the first matching ring is pushed to rotate relative to the second matching ring, the third limiting groove is enabled to be aligned with the first limiting groove, a buckle in the third limiting groove abuts against the top of the first sliding rail, then the lower sheath is released, the first spring elastically resets and pushes the first matching ring, and the second matching ring on the lower sheath moves towards the bottom end direction of the connecting pipe along the first sliding rail, so that rotary transposition is completed.

6. The single-use bi-directional protective safety insulin pen needle according to claim 2, wherein the body of the connection tube is provided with a second through groove, the inner wall of the lower sheath is provided with a second sliding rail, and the second sliding rail is accommodated in the second through groove and moves up and down therein, thereby limiting the up and down direction of the lower sheath.

7. The single use bi-directional protective safety insulin pen needle according to claim 6, wherein said upper sheath has a sleeve and a top plate disposed on top of the sleeve; the connecting pipe is characterized in that a first mounting ring and a second mounting ring which are arranged up and down are arranged on the inner wall of the body of the connecting pipe, a second spring is sleeved outside the sleeve, and two ends of the second spring are respectively arranged on the top plate and the first mounting ring, so that the upper sheath is erected in the connecting pipe.

8. The disposable bi-directional protective safety insulin pen needle according to claim 7, wherein the outer wall of the upper sheath is provided with a matching groove, and an inclined outward elastic clamping protrusion is arranged in the matching groove; in the initial state, the elastic clamp is convexly arranged 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 second slide rail is equipped with a inclined plane, when the lower sheath to the top direction of needle tubing removes to the inclined plane of second slide rail contacts the elasticity card is protruding and with it promotes to in the cooperation groove, thereby relieve the second collar is to the protruding blocking of elasticity card, makes the upper sheath can be under the promotion of second spring moves to the top direction of needle tubing, will the elasticity card is protruding to second collar top, and is blocked by first collar, and can not follow in the go-between drops.

9. The single use bi-directional protective safety insulin pen needle according to claim 8, wherein a first notch is provided on the first mounting ring and a second notch is provided on the second mounting ring; the first notch and the second notch are used for the second sliding rail to pass through.

10. The single-use bi-directional protective safety insulin pen needle according to claim 8, wherein a limit post is provided in the circumferential direction of the top plate, and the limit post is inserted into the second through slot, thereby limiting the lifting direction of the upper sheath and preventing the upper sheath from being biased; a pinhole is arranged on the top plate for the needle tube to pass through.