WO2020019154A1

WO2020019154A1 - Disposable anti-puncturing insulin injection needle and anti-puncturing method

Info

Publication number: WO2020019154A1
Application number: PCT/CN2018/096792
Authority: WO
Inventors: 陆军; 赵丽杰; 张传雷; 倪琳; 马兆霞; 孔炜彬; 陈天柱; 任涛
Original assignee: 江苏采纳医疗科技有限公司
Priority date: 2018-07-24
Filing date: 2018-07-24
Publication date: 2020-01-30
Also published as: CN109496158A; CN109496158B

Abstract

A disposable anti-puncturing insulin injection needle, comprising a housing (10), a needle seat (20), an injection needle (21), a needle tip protection sleeve (30), an elastic member (1), a sliding sleeve (50), and an anti-withdrawal claw (60); the sliding sleeve (50) is sleeved over the needle seat (20), the anti-withdrawal claw (60) is fixedly connected to the needle seat (20) and comprises a claw portion (62) that is at least partially located at the exterior of the sliding sleeve (50) and that opens outward; when the needle tip protection sleeve (30) is pressed to move toward the needle seat (20), the elastic member (1) is pressed to deform and hook to the sliding sleeve (50); when the pressure is removed, the elastic element (1) pushes the needle tip protection sleeve (30) to move and drives the sliding sleeve (50) to detach from the anti-withdrawal claw (60), and the anti-withdrawal claw (60) is restored to the original state to prevent the sliding sleeve (50) and the needle tip protection sleeve (30) from moving downward. The injection needle may reliably self-lock after use, and is safer.

Description

Single-use anti-acupuncture insulin injection pen needle and anti-acupuncture method

Technical field

The invention relates to the field of medical devices, and in particular, to a disposable anti-acupuncture insulin injection pen needle and an anti-acupuncture method.

Background technique

Diabetes is a common chronic disease. As the course of the disease progresses, patients need to inject insulin to achieve the purpose of lowering glucose. Needles for insulin injection pens are rapidly being widely used in the field of diabetes treatment. Compared with the traditional needle injection, the insulin pen usually has the following advantages: 1. Eliminates the tediousness of needle injection, avoids the embarrassment of public places, and is more convenient for patients with poor vision. 2. Insulin dose is more precise, insulin dose adjustment can be made in 1 unit. The syringe is generally accurate to a minimum of 2 units. 3. Basically painless, its needle is thinner than that of a dedicated insulin syringe. Some patients think that there is almost no pain after using it. However, the needle stick injury of the insulin injection pen needle is one of the most common occupational risks for medical staff and the main cause of nosocomial infections. It is also a topic that needs attention for diabetes patients and their families who need insulin injection treatment. According to a study of needlestick injuries caused by insulin injections, 60% of the needlestick injuries came from the needle caps. We found that in patients treated with insulin, only a small number of patients wore an outer needle cap immediately after the injection was completed. However, most of the needles were not removed from the injection pen in a timely manner and discarded in hard-capped containers with caps. These irregular operations have greatly increased the risk of needlestick injuries for patients, their families, and even sanitation workers.

The frequent use of needles for insulin injection pens is most likely to cause secondary injuries to medical staff. At present, there are many types of disposable needles for insulin injection pens in the market, but they have their own problems, such as complex structures and high production costs. Large volume and inconvenient use; In addition, after the current insulin injection pen needles, people cannot clearly know whether they have been used. To determine whether they have been used, they need to be determined by pressing the needle tip protective sleeve. When the self-locking mechanism fails, the needle tip easily hurts people, and there is a greater safety risk.

Summary of the Invention

An object of the present invention is to provide a disposable anti-needle insulin injection pen needle against the above-mentioned shortcomings in the prior art, which can self-lock after use, thereby preventing accidental injury caused by the needle tip being exposed. And high reliability.

In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution: a single-use anti-acupuncture insulin injection pen needle, comprising a housing, a needle seat installed in the housing, and an injection fixed in the needle seat A needle, a needle tip protective sleeve movably mated with the shell, and an elastic element installed between the needle base and the needle tip protective sleeve, the disposable anti-acupuncture insulin injection pen needle further includes a sliding sleeve and a stop Claw, the sliding sleeve is slidably sleeved on the needle base, and the anti-retraction claw is fixedly connected to the needle base;

When the needlepoint protective sleeve moves into the housing under pressure, the needlepoint protective sleeve presses the elastic element to generate a compression deformation and is hooked with the sliding sleeve; when the needlepoint protective sleeve loses pressure, the The needle tip protective sleeve and the sliding sleeve are moved to the outside of the housing under the elastic restoring force of the elastic element; and the back pawl prevents the sliding sleeve and the needle protective sleeve from moving into the housing.

In addition, the present invention also proposes the following subsidiary technical solutions:

The sliding sleeve includes a clip sleeve, the clip sleeve is provided with a groove, and the needlepoint protection sleeve is provided with a protruding portion hooked with the groove.

The clip sleeve is provided with a tapered surface.

The raised portion is provided with a guide cone surface.

The clip sleeve is provided with a long slot along the axis direction.

The long groove extends beyond a position of the groove.

The sliding sleeve is also provided with a shaft shoulder. When the needlepoint protective sleeve moves into the housing again under pressure, the shaft shoulder supports and abuts against the needlepoint protective sleeve, and the back pawl supports and abuts. The sliding sleeve prevents the needle tip protective sleeve from moving into the housing.

The back pawl includes a body portion fixedly connected to the needle base and a claw portion connected to the body portion.

A backstop hole is provided at one end of the sliding sleeve, and the diameter of the backstop hole is larger than the maximum outer diameter of the claw. The sliding sleeve is supported in the back-off hole.

The needle base includes a base portion, and the casing is provided with a clamping slot that cooperates with the base portion.

The needle base further includes a connection portion connected to the base portion and a fixing portion connected to the connection portion, and the diameter of the fixing portion is smaller than the diameter of the connection portion.

The sliding sleeve is slidably sleeved on the connecting portion,

The anti-retraction claw fixing sleeve is disposed outside the fixing portion and is partially located in the sliding sleeve.

A convex edge is provided on the surface of the fixing portion, and a groove matched with the convex edge is provided on the inner surface of the back pawl.

The needlepoint protective sleeve includes a cylinder portion, and the housing is provided with a mouth portion, and the cylinder portion is slidably fitted with the mouth portion.

The needle tip protective sleeve further includes a ring portion provided at one end of the cylinder portion, and the ring portion is slidably fitted in the housing and has an outer dimension larger than that of the mouth portion.

The single-use anti-acupuncture insulin injection pen needle further includes a casing protective sleeve sleeved on the outside of the casing and a sealing paper sealing the casing.

The needle tip protective sleeve is made of transparent material, and the sliding sleeve is colored.

The invention also proposes a method for preventing acupuncture-resistant insulin injection pen needles after use. The disposable needle-proof insulin injection pen needles include a shell, a needle seat installed in the shell, and a fixing. An injection needle in the needle base, a needle tip protective sleeve movably mated with the shell, an elastic piece installed in the shell and abutting the needle base and the needle tip protective sleeve, are slidably sleeved on A sliding sleeve on the needle base and a retaining claw fixedly connected to the needle base;

The method includes the following steps:

Pressing the needle tip protective sleeve, the needle tip protective sleeve moves into the casing and compresses the elastic member until the needle tip protective sleeve is hooked with the sliding sleeve;

Loosen the needlepoint protective sleeve, and the needlepoint protective sleeve drives the sliding sleeve to move outside the housing under the action of the elastic member's restoring force until the needlepoint protective sleeve moves to the initial position;

When the needlepoint protective sleeve is pressed again, the sliding sleeve abuts against the needlepoint protective sleeve, and at the same time, the back pawl abuts against the sliding sleeve, thereby preventing the needlepoint protective sleeve from moving into the housing.

In addition, the method has the following subsidiary technical solutions:

The sliding sleeve includes a clip sleeve, the clip sleeve is provided with a groove, and the needlepoint protection sleeve is provided with a convex portion that cooperates with the groove.

The sliding sleeve is further provided with a shaft shoulder that can be abutted against the needlepoint protection sleeve. When the needlepoint protection sleeve moves to abut against the shaft shoulder, the needlepoint protection sleeve does not completely enter the housing.

The back pawl includes a claw portion that is opened outward, and after the needle tip protective sleeve is released, the sliding sleeve compresses the claw portion during movement to the outside of the housing, and the elastic member returns to its original state. , The claw portion returns to the original state and abuts against the sliding sleeve.

After the acupuncture insulin injection pen needle is used, at least a part of the sliding sleeve is located outside the casing, the needle tip protective sleeve is made of transparent material, and the sliding sleeve is colored.

Compared with the prior art, the advantages of the present invention are:

1. The injection pen needle of the present invention can be reliably self-locked after use to prevent the needle tip from being exposed and causing accidental injury to people;

2. The injection pen needle of the present invention can be made into a compact volume due to its simple structure, and the patient or the medical staff has a good hand feeling;

3. The injection pen needle of the present invention can emit a sound prompt when self-locking, and people can clearly know whether it is used in place, and the problem of unlocking after use will not occur;

4. After using the injection pen needle of the present invention, people can clearly see the inner sliding sleeve, so as to remind people that the syringe has been used, and there is no need to manually determine whether it has been used and self-locking like the pen needle on the market. .

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a disposable anti-acupuncture insulin injection pen needle according to the present invention.

FIG. 2 is a schematic diagram of a single-use anti-needle insulin injection pen needle assembly according to the present invention.

FIG. 3 is a schematic structural diagram of a disposable anti-acupuncture insulin injection pen needle according to the present invention.

FIG. 4 is a schematic structural diagram of a needle tip protective sleeve in the present invention.

FIG. 5 is a schematic structural diagram of a needle base in the present invention.

FIG. 6 is a schematic structural diagram of a sliding sleeve in the present invention.

FIG. 7 is an enlarged view of part I in FIG. 3.

FIG. 8 is a schematic structural view of a stopping pawl of the present invention.

FIG. 9 is a schematic diagram when the needle tip protective sleeve is moved to catch the sliding sleeve in the present invention.

FIG. 10 is a schematic structural view of a disposable anti-acupuncture insulin injection pen needle of the present invention after use.

detailed description

The technical solution of the present invention will be further described in a non-limiting manner with reference to the preferred embodiments and the accompanying drawings.

As shown in FIG. 1 and FIG. 2, a disposable anti-acupuncture insulin injection pen needle corresponding to a preferred embodiment of the present invention includes a housing 10, a needle holder 20 installed in the housing 10, and the housing 10 The movable tip protection sleeve 30 and the outer casing protection sleeve 40 are sleeved on the outside of the outer casing 10.

As shown in FIG. 3, one end of the housing 10 is provided with an insulin pen assembling portion 11, and an inner side of the assembly portion 11 is provided with a thread or a fitting port for cooperation with an insulin injection device (such as an insulin pen). In this embodiment, in A thread 12 is provided on the inner side of the assembling portion 11 to cooperate with an insulin injection device (such as an insulin pen).

The needle base 20 is used for fixing the injection needle 21, and one end of the injection needle 21 extends outside the casing 10. A base portion 22 is provided at one end of the needle base 20, and the diameter of the base portion 22 is larger than the diameter of other portions of the needle base 20. A clamping groove 13 is opened on the inner surface of the casing 10 near the thread 12, and the base portion 22 is clamped in the clamping groove 13 so as to be fixed in the casing 10.

Referring to FIG. 4, the needle tip protective sleeve 30 includes a cylindrical portion 31 having a substantially cylindrical shape and a ring portion 32 provided at one end of the cylindrical portion 31 and protruding outwardly. A center of the needle tip protective sleeve 30 is provided for avoiding the passage of the injection needle 21. Hole 33. Referring to FIG. 3, a mouth portion 15 communicating with the inner cavity 14 is opened on the top of the housing 10, and the diameter of the mouth portion 15 is smaller than the diameter of the inner cavity 14. The cylindrical portion 31 is matched with the mouth portion 15, and the ring portion 32 is matched with the inner wall of the inner cavity 14. The diameter of the ring portion 32 is larger than the diameter of the mouth portion 15, so that the pillar portion 31 can move relative to the mouth portion 15 and also The needle tip protective sleeve 30 can be prevented from coming out of the casing 10. An elastic member 1 is also provided in the casing 10. In this embodiment, the elastic member 1 is a spring. The two ends of the spring 1 respectively abut the base 22 of the needle holder 20 and the ring portion 32 of the needle tip protective sleeve 30, so that in the normal state, the spring 1 presses the ring portion 32 to keep contact with the mouth portion 15. At this time, the needle tip protective sleeve 30 surrounds Hold the part of the injection needle 21 that leaks out of the housing 10, so that the injection needle 21 is not exposed to the outside, and when the needle tip protection sleeve 30 is under pressure (such as the skin giving pressure to the needle tip protection sleeve 30 during injection), the needle tip protection sleeve 30 can overcome the spring 1 The resistance is contracted into the housing 10 and the injection needle 21 is leaked out.

The outer casing protective sleeve 40 is sleeved on the outer portion of the outer casing 10, and its inner wall is in interference fit with the annular flange 16 provided at one end of the outer casing 10, so as to be connected to the outer casing 10, and one can apply the appropriate force to the outer casing protective sleeve 40 from the outer casing. Remove on 10. The housing protective cover 40 completely covers the needle tip protective cover 30 when being set on the housing 10, preventing the injection needle 21 from being polluted before use, and preventing the user from being injured by accidentally touching the needle tip. In addition, a sealing paper 42 is further provided at the open end 41 of the case protective cover 40, and the sealing paper 42 is preferably a dialysis paper. The housing protective cover 40 and the sealing paper 42 form a closed environment to prevent the needle seat 20, the injection needle 21 and the like inside from being contaminated by the outside.

Further, referring to FIG. 5, the needle base 20 is further provided with a connecting portion 23 connected to the base portion 22 and a fixing portion 24 connected to the connecting portion 23. The fixing portion 24, the connecting portion 23 and the base portion 22 are preferably integrally formed, and The diameters of the fixing portion 24, the connecting portion 23, and the base portion 21 are sequentially increased.

The insulin injection pen needle of the present invention further includes a sliding sleeve 50 and a back pawl 60.

Referring to FIGS. 5, 6 and 7, the sliding sleeve 50 is sleeved on the connecting portion 23, and a through-hole 51 is opened in the inside, and a backstop hole 52 is provided at one end. The diameter of the backstop hole 52 is larger than the mounting hole. 51 diameter. The mounting hole 51 is mated with the connecting portion 23. On the base 22 of the needle holder 20, a plurality of positioning posts 26 are evenly distributed around the axis of the connecting part 23. In this embodiment, the number of positioning posts is four. The inner surface of the positioning post 26 cooperates with the outer surface of the sliding sleeve 50 for positioning. Position of the sliding sleeve 50 on the needle base 20. The sliding sleeve 50 includes a clamping sleeve 53 at the front end thereof. The diameter of the clamping sleeve 53 is smaller than the rest of the sliding sleeve 50, so that a shoulder 54 is formed at the connection. The outer diameter of the shaft shoulder 54 is larger than the diameter of the through hole 33 of the needle tip protective sleeve 30, and the diameter of the clip sleeve 53 is smaller than the diameter of the through hole 33. In this way, when the needle tip protective sleeve 30 moves into the casing 10, it can be sleeved outside the clip sleeve 53, and the inward movement distance of the needle tip protective sleeve 30 can be restricted by the shoulder 54. Preferably, when the tip protection sleeve 30 contacts the shoulder 54, the upper end of the tip protection sleeve 30 does not sink into the housing 10, so as to prevent the tip protection sleeve 30 from completely sinking into the housing 10, the upper end of the tip protection sleeve 30 and the mouth 15 Defects in the peripheral wall that cannot be ejected smoothly. In order to facilitate the 30 sets of needlepoint protection sleeves to be connected to the clip sleeve 53, a tapered surface 55 is provided on the clip sleeve 53.

Referring to FIG. 4, FIG. 6 and FIG. 7, a ring-shaped groove 56 is provided on the clip sleeve 53, and a convex portion 35 is provided on the inner wall of the needle tip protective sleeve 30 to cooperate with the groove 56. The diameter is smaller than the outer diameter of the clip sleeve 53. The convex portion 35 may be a ring-shaped full circle, or a plurality of convex portions 35 may be provided to form an intermittent ring shape. As in this embodiment, the number of the convex portions 35 is two, and they are oppositely disposed. A guide tapered surface 34 is provided below the raised portion 35. The clip sleeve 53 extends at least partially to the fixing portion 24 of the needle base 20. During the movement of the needle tip protective sleeve 30 to the clamping sleeve 53, the guiding tapered surface 34 and the tapered surface 55 cooperate with each other and generate a certain deformation so that the convex portion 35 can be smoothly hooked into the groove 56. In order to be able to generate sufficient deformation and enhance its reliability, a plurality of long grooves 57 are provided in the card socket 53 along the axial direction, in this embodiment, four long grooves 57 are provided from the end 58 of the card socket 53 to Extending inwardly, and preferably beyond the groove 56. In this way, when the guide tapered surface 34 presses the tapered surface 55, the clamping sleeve 53 will deform inward until the convex portion 35 hooks into the groove 56. At this time, due to the momentary loss of pressure on the tapered surface 55, the pressure will return. The inner wall of the tip protection sleeve 30 is bounced and tapped, and a slight clicking sound is issued to remind people that the tip protection sleeve 30 has been moved into place.

As shown in FIG. 8, the back pawl 60 includes a body portion 61 and a claw portion 62 connected to each other. The body portion 61 is fixed on the fixing portion 24. Specifically, the fixing portion 24 is provided with a ring-shaped convex edge 25, and the body portion 61 is provided with a ring-shaped groove 64 that cooperates with the convex edge 25. The main body portion 61 is columnar. Preferably, the outer diameter of the main body portion 61 is the same as or smaller than the outer diameter of the connecting portion 23; the claw portion 62 gradually expands outward from the connection with the main body portion 61 (the diameter gradually increases) Becomes larger), it exceeds the sliding sleeve 50 in the axial direction, and the maximum diameter of the top end thereof is larger than the diameter of the mounting hole 51 of the sliding sleeve 50 and smaller than the diameter of the back hole 52 and the through hole 33 of the needle tip protective sleeve 30, preferably The maximum outer diameter of the claw portion 62 is set to be smaller than the minimum inner diameter of the convex portion 35, so that when the needle tip protective sleeve 30 moves into the housing 10, the guide cone surface 34 will not contact the claw portion 62, reducing the need for use. Pressure, has a better experience; the claw portion 62 can limit the position of the sliding sleeve 50 in the axial direction of the needle holder 20. In this embodiment, the number of the claw portions 62 is four. A slit 63 along the axial direction is provided between two adjacent claw portions 62. The slit 63 extends from the end surface 65 of the claw portion 62 to the body portion 61, and Preferably, it extends to the body portion 61.

The clamping sleeve 53 extends at least partially to the claw portion 62 in the axial direction. When the needle tip protective sleeve 30 is moved into the housing 10 by an external force, the convex portion 35 first presses the tapered surface 55, and the tapered surface 55 will deform inward, thereby Provide a sufficient amount of deformation for the protrusion 35 to move into the groove 56 (refer to FIG. 9); when the external force of the needle tip protective sleeve 30 is released, the spring 1 pushes the needle tip protective sleeve 30, and the needle tip protective sleeve 30 hooks the sliding sleeve 50 to overcome the sliding The frictional force between the sleeve 50 and the claw portion 62 moves upwards, so that the sliding sleeve 50 is partially taken out of the housing 10. Referring to FIG. 10, the pressure of the sliding sleeve 50 on the claw portion 62 is released, and the claw portion 62 returns to the original Shape, when people press the needle tip protective sleeve 30, the lower end of the needle tip protective sleeve 30 presses the shaft shoulder 54 of the sliding sleeve 50, and the stopper hole 52 of the sliding sleeve 54 is pressed by the claw portion 62 so that it cannot descend, at this time, the injection needle 21 The outside of the needle tip protective sleeve 30 is not leaked, thereby preventing people from being injured by accidentally pressing the needle tip protective sleeve 30. Preferably, the needle tip protective sleeve 30 is made of a transparent material so that the internal objects can be easily observed; and the sliding sleeve 50 has a color, especially a more eye-catching color, such as red, so that people can easily and noticeably notice the sliding sleeve. 50 to remind people that this pen has been used.

Except that the spring injection needle is made of metal material and the sealing paper 42 is made of dialysis paper, the rest of the insulin injection pen needles are preferably made of plastic and can be injection-molded with light weight.

When using the single-use anti-needling insulin injection pen needle (hereinafter referred to as a pen needle), firstly tear off the sealing paper 42 of the protective sleeve 40 of the casing, and screw the insulin pen containing the insulin medication into the pen needle, and then tighten it from the casing. The protective cover 40 pulls out the stylus. During this process, the protective cover 40 of the housing plays a complete protective role, and the patient or medical staff cannot touch the needle tip; it can effectively prevent potential needlepoint accidental stab wounds.

After that, the screwed pen needle is directly inserted into the skin for injection. The needle tip protective sleeve 30 is retracted under pressure and catches the sliding sleeve 50 inside the casing 10. When it is caught, a slight click sound is issued, indicating that the needle has completely entered the skin. ; Patients can be easily injected.

When the injection pen needle is pulled out after the injection, the needle tip protective sleeve 30 is ejected by the pressure of the spring 1 and drives the slide sleeve 50 to eject. After the slide sleeve 50 is ejected, it is held by the retaining pawl 60 to prevent it from retracting, that is, in the self-lock At the same time, the needle tip protective sleeve 30 is ejected so that the needle tip of the syringe 21 will not be exposed. And after the injection is completed, the red sliding sleeve 50 can be seen in the transparent needle tip protective sleeve 30, which indicates that the pen needle is completely self-locking. The patient or medical staff can safely discard the pen needle directly in the storage box, unlike other pen needles. Need to confirm whether the self-locking is completed. Guaranteed one-time use.

During the entire injection process, patients or volunteers cannot touch the needle, which not only reduces the risk of cross infection caused by medical staff and patients with needle stick injuries, but also helps alleviate the anxiety of patients, especially children.

The method for preventing acupuncture after using the single-use anti-acupuncture insulin injection pen needle is as follows:

First, the needle tip protective sleeve 30 is pressed (usually, the skin applies pressure to the needle tip protective sleeve 30 during injection), and the needle tip protective sleeve 30 moves into the housing 10 and compresses the elastic member 1 until the convex portion 35 of the needle tip protective sleeve 30 and the sliding sleeve 50 grooves 56 are hooked;

After releasing the needle tip protective sleeve 30, the needle tip protective sleeve 30 drives the sliding sleeve 50 to move outside the casing 10 under the restoring force of the elastic member 1, until the ring portion 32 of the needle tip protective sleeve 30 is blocked by the casing 10. At this time, the needle tip protective sleeve 30 is in the initial position, the needle tip protective sleeve 30 completely covers the injection needle 21 to prevent the injection needle 21 from being exposed; during the movement of the sliding sleeve 50, the claw portion 62 of the back pawl 60 is compressed, and the needle tip protective sleeve 30 times When the initial position or the previous position is reached, the claw portion 62 is no longer compressed, and the claw portion 62 returns to deform and expands;

When the needle tip protective sleeve 30 is pressed again, the lower end of the needle tip protective sleeve 30 abuts against the shaft shoulder 54 of the sliding sleeve 50, and at the same time, the claw portion 62 of the back pawl 60 abuts against the sliding sleeve 50, thereby preventing the needle tip protective sleeve 30 from facing the casing. Move within 10.

The disposable anti-acupuncture insulin injection pen needle of the present invention includes at least the following advantages:

It should be pointed out that the above-mentioned preferred embodiments are only for explaining the technical concepts and features of the present invention, and the purpose thereof is to enable persons familiar with the technology to understand the content of the present invention and implement it accordingly, and shall not limit the present invention. protected range. Any equivalent change or modification made according to the spirit and essence of the present invention should be covered by the protection scope of the present invention.

Claims

A disposable anti-acupuncture insulin injection pen needle includes a housing (10), a needle base (20) installed in the housing (10), and an injection needle (20) fixed in the needle base (20). 21) a needle tip protective sleeve (30) movably mated with the housing (10) and an elastic element (1) installed between the needle base (20) and the needle tip protective sleeve (30), characterized in that : The single-use anti-acupuncture insulin injection pen needle further includes a sliding sleeve (50) and a non-retracting claw (60), and the sliding sleeve (50) is slidably sleeved on the needle base (20), The back pawl (60) is fixedly connected to the needle base (20);

When the needle-point protective sleeve (30) is moved into the housing (10) under pressure, the needle-point protective sleeve (30) presses the elastic element (1) to produce a compression deformation, and interacts with the sliding sleeve (50). ) Hooked; when the needle tip protective sleeve (30) loses pressure, the needle tip protective sleeve (30) and the sliding sleeve (50) move toward the housing under the action of the elastic restoring force of the elastic element (1) (10) External movement; and the back pawl (60) prevents the sliding sleeve (50) and the needle tip protective sleeve (30) from moving into the housing (10).
The disposable anti-acupuncture insulin injection pen needle according to claim 1, characterized in that the sliding sleeve (50) comprises a snap-in sleeve (53), and the snap-in sleeve (53) is provided with a groove (56) ), The needle tip protective sleeve (30) is provided with a protruding portion (35) hooked to the groove (56).
The single-use anti-acupuncture insulin injection pen needle according to claim 2, characterized in that the clip sleeve (53) is provided with a tapered surface (55).
The disposable anti-acupuncture insulin injection pen needle according to claim 2, characterized in that the convex portion (35) is provided with a guide cone surface (34).
The single-use anti-acupuncture insulin injection pen needle according to claim 2, characterized in that the card sleeve (53) is provided with a long groove (57) along the axis direction.
The disposable anti-acupuncture insulin injection pen needle according to claim 5, characterized in that said long groove (57) extends to a position beyond said groove (56).
The disposable anti-acupuncture insulin injection pen needle according to claim 1, characterized in that the sliding sleeve (50) is further provided with a shaft shoulder (54), and the needle tip protective sleeve (30) is pressed again toward the When moving inside the casing (10), the shaft shoulder (54) supports and abuts against the needle tip protective sleeve (30), and the back pawl (60) supports and abuts against the sliding sleeve (50), As a result, the needle tip protective sleeve (30) is prevented from moving into the casing (10).
The disposable anti-acupuncture insulin injection pen needle according to claim 1, characterized in that the anti-retraction claw (60) comprises a body portion (61) fixedly connected to the needle base (20) and the body A claw portion (62) connected to the body portion (61).
The disposable anti-acupuncture insulin injection pen needle according to claim 8, characterized in that: one end of the sliding sleeve (50) is provided with a back-stop hole (52), and the diameter of the back-stop hole (52) is larger than that The maximum outer diameter of the claw portion (62) is located in the backstop hole (52) when the needle tip protective sleeve (30) is moved into the housing (10) again under pressure. The sliding sleeve (50) is supported inside and supported.
The disposable anti-acupuncture insulin injection pen needle according to claim 1, characterized in that the needle base (20) includes a base (22), and the casing (10) is provided to cooperate with the base (22) Card slot (13).
The disposable anti-acupuncture insulin injection pen needle according to claim 10, wherein the needle base (20) further comprises a connecting portion (23) connected to the base portion (22) and the connecting portion (23) A connected fixing portion (24), the diameter of the fixing portion (24) is smaller than the diameter of the connecting portion (23).
The disposable anti-acupuncture insulin injection pen needle according to claim 11, wherein the sliding sleeve (50) is slidably sleeved on the connecting portion (23),
The disposable anti-acupuncture insulin injection pen needle according to claim 12, characterized in that the anti-retraction claw (60) is fixedly sleeved on the outside of the fixing part (24) and partly located on the sliding sleeve (50 )Inside.
The disposable anti-acupuncture insulin injection pen needle according to claim 13, characterized in that: the surface of the fixing portion (24) is provided with convex ribs (25), and the inner surface of the anti-retraction claw (60) is provided with The convex groove (25) is matched with a groove (64).
The single-use anti-acupuncture insulin injection pen needle according to claim 1, characterized in that the needle tip protective sleeve (30) includes a cylinder portion (31), and the casing (10) is provided with a mouth portion (15) , The pillar portion (31) and the mouth portion (15) are slidingly fitted.
The disposable anti-acupuncture insulin injection pen needle according to claim 15, wherein the needle tip protective sleeve (30) further comprises a ring portion (32) provided at one end of the cylinder portion (31), and The ring portion (32) is slidably fitted in the casing (10), and its outer size is larger than the size of the mouth portion (15).
The single-use anti-acupuncture insulin injection pen needle according to claim 1, further comprising a casing protection sleeve (40) sleeved on the outside of the casing (10) and a seal for sealing the casing (10). Sealing paper (42).
The single-use anti-acupuncture insulin injection pen needle according to any one of claims 1 to 17, wherein the needle tip protective sleeve (30) is made of transparent material, and the sliding sleeve (50) is colored .
A method for preventing acupuncture of a single-use anti-acupuncture insulin injection pen needle after use is characterized in that it includes the following steps:

Provide a housing (10), a needle base (20) installed in the housing (10), an injection needle (21) fixed in the needle base (20), and a needle tip movably mated with the housing (10) A protective sleeve (30), an elastic piece (1) installed in the housing (10) and abutting the needle base (20) and the needle tip protective sleeve (30), and slidably sleeved on the needle A sliding sleeve (50) on the seat (20) and a back pawl (60) fixedly connected to the needle seat (20);

Press the needle tip protective sleeve (30), the needle tip protective sleeve (30) moves into the housing (10) and compresses the elastic member (1) until the needle tip protective sleeve (30) and the slide Set (50) hooked up;

The needle tip protective sleeve (30) is loosened, and the needle tip protective sleeve (30) drives the sliding sleeve (50) to move outside the housing (10) under the action of the restoring force of the elastic member (1) until The needle tip protective sleeve (30) moves to the initial position;

Pressing the needle tip protective sleeve (30) again, the sliding sleeve (50) is pressed against the needle tip protective sleeve (30), and at the same time, the back pawl (60) is pressed against the sliding sleeve (50), thereby preventing the The needle tip protective sleeve (30) moves into the casing (10).
The method according to claim 19, wherein the sliding sleeve (50) comprises a snap-in sleeve (53), and the snap-in sleeve (53) ) Is provided with a groove (56), and the needle tip protective sleeve (30) is provided with a convex portion (35) that cooperates with the groove (56).
The method according to claim 19, wherein the sliding sleeve (50) is further provided with an abutment against the needle tip protective sleeve (30). The shaft shoulder (54), when the needlepoint protective sleeve (30) moves to abut against the shaft shoulder (54), the needlepoint protective sleeve (30) does not completely enter the casing (10).
The method for preventing acupuncture after use of a disposable anti-acupuncture insulin injection pen needle according to claim 19, characterized in that said back pawl (60) includes at least one pawl portion (62) which is open outward, After the needle tip protective sleeve (30) is released, the sliding sleeve (50) compresses the claw portion (62) during the movement to the outside of the casing (10), and the elastic member (1) returns to the original state After that, the claw portion (62) returns to the original state and abuts against the sliding sleeve (50).
The method for preventing acupuncture after using a single-use anti-acupuncture insulin injection pen needle according to claim 19, characterized in that, after using the acupuncture insulin injection pen needle, at least part of the sliding sleeve (50) is located in the casing (10) Outside, the needle tip protective sleeve (30) is made of transparent material, and the sliding sleeve (50) is colored.