CN219814903U - Needle head for needle-punching-preventing injection pen - Google Patents

Abstract

The utility model belongs to the field of medical appliances, and relates to a needle head for an anti-needling injection pen, which comprises a shell and a needle seat, wherein a needle tube cavity is arranged in the needle seat, and a needle tube is inserted into the needle tube cavity; the brake sleeve is arranged on the inner wall of the brake sleeve, the needle seat is arranged in the brake sleeve for compensation, the lower part of the needle seat is in running fit with the lower part of the inner wall of the brake sleeve, the lower part of the telescopic sleeve is inserted into the upper part of the brake sleeve, a boss is arranged on the upper part of the inner wall of the brake sleeve, and the boss is inserted into a movable self-locking groove on the lower part of the outer wall of the telescopic sleeve; a spring is abutted between the telescopic sleeve and the needle seat; the shell wraps the brake jacket and the telescopic sleeve, and the shell is matched with the brake jacket in a mounting way. The utility model solves the problem that the needle tip is exposed, can effectively avoid acupuncture medical staff and patients, can automatically realize self-locking after injection is finished, does not need additional operation, and improves the safety of the injection pen.

Description

Needle head for needle-punching-preventing injection pen

Technical Field

The utility model relates to a needle head for an anti-needling injection pen, belonging to the field of medical appliances.

Background

Diabetes is a metabolic disorder characterized by elevated blood glucose due to defective insulin secretion and/or action, and is called a "silent killer". The complications involve a plurality of organs such as blood vessels, eyes, kidneys and feet, and the like, so that the disability rate is high, the health of patients is seriously affected, and a heavy burden is brought to individuals, families and society. Insulin is currently the most effective and safest hypoglycemic agent, but it cannot be taken orally and needs to be injected. And compared with oral medicines, the injection of insulin is less prone to have side effects on liver, kidney, heart and the like.

Compared with the traditional injector, the insulin injection pen has stronger convenience and simpler operation, and can avoid the complicated step of extracting insulin by a patient. In the process of disassembling and assembling the needle head of the common injection pen, the needle point is exposed, so that the risk of needle puncture injury to medical staff and patients is high. At present, an injection pen capable of preventing needling is also available, and the needle head of the injection pen capable of preventing needling and self-destruction is disclosed in patent CN114404740A, but after the injection is completed, additional operation is needed, and the self-locking self-destruction can be finally realized only by pulling the safety sheath outwards, so that the operation steps are relatively more.

Disclosure of Invention

The utility model aims to solve the technical problems that: the needle head for the needle-punching-prevention type injection pen is provided, solves the problem that the needle tip is exposed outside due to explosion, can effectively avoid needle-punching medical staff and patients, can automatically realize self locking after injection is finished, does not need additional operation, and improves the safety of the injection pen.

The needle head for the anti-needling injection pen comprises a shell and a needle seat, wherein a needle tube cavity is arranged in the needle seat, and a needle tube is inserted into the needle tube cavity; the brake sleeve is arranged on the inner wall of the brake sleeve, the lower part of the needle seat is in running fit with the lower part of the inner wall of the brake sleeve, the lower part of the telescopic sleeve is inserted into the upper part of the inner wall of the brake sleeve, the upper part of the inner wall of the brake sleeve is provided with a boss, and the boss is inserted into a movable self-locking groove of the lower part of the outer wall of the telescopic sleeve; a spring is abutted between the telescopic sleeve and the needle seat; the shell wraps the brake jacket and the telescopic sleeve, and the shell is matched with the brake jacket in a mounting way.

The inner wall of the shell is provided with a reinforcing rib which is in interference fit with the brake jacket; when the telescopic sleeve is used, the needle seat is fixedly connected with the product through threads, the interference fit between the shell and the brake jacket is destroyed through external force, and the shell is taken down to expose the telescopic sleeve; when in injection, the product is pressed, the telescopic sleeve moves along the axis, the corresponding boss moves to one end along the self-locking groove, the spring is compressed in the process, and the needle tube penetrates out of the telescopic sleeve and is pricked into a patient to complete injection; after injection is completed, the product is pulled out, the telescopic sleeve moves reversely along the axis under the action of the spring, the boss moves reversely along the movable self-locking groove to the other end to realize self-locking clamping, the telescopic sleeve cannot move any more, and at the moment, the needle tube tip is wrapped in the telescopic sleeve. The product is in telescopic cover inside around using, and needle tubing pointed end is in effective play and prevents the acupuncture effect, and under the effect of spring, the boss can by oneself by the chucking need not other extra operations, convenient to use is simple.

Preferably, the lower part of the inner wall of the brake jacket is provided with a plurality of transverse ribs, the outer wall of the lower part of the needle seat is provided with a rotary groove, the transverse ribs are clamped in the rotary groove, and the transverse ribs rotate along the rotary groove. There is no axial movement along the axis between the needle seat and the brake jacket, and only relative rotation occurs between the two.

Preferably, the outer wall of the needle seat is in a ladder shape, a guide post is arranged in the small end of the needle seat, a needle tube cavity is arranged in the guide post, and a spring is sleeved on the periphery of the guide post; the outer wall of the small end of the needle seat is provided with a guide vertical groove, the lower part of the inner wall of the telescopic sleeve is provided with a vertical rib, and the vertical rib is clamped in the guide vertical groove. The telescopic sleeve is contracted or popped up in the process, the vertical ribs move up and down along the guide vertical grooves, and the cooperation of the vertical ribs and the guide vertical grooves plays a role in guiding the movement of the telescopic sleeve, so that the telescopic sleeve and the needle seat are prevented from rotating.

Preferably, the top of the telescopic sleeve is provided with a round platform ring, the round platform ring is coaxial with the guide post, and the upper part of the spring is sleeved on the periphery of the round platform ring. The spring both ends suit are in guide post and round platform ring periphery respectively, guarantee that the spring can only axial compression or reset for there is reverse effort between needle file and the flexible cover, avoids the spring to take place the dislocation and influences the reset locking of flexible cover.

Preferably, the top surface of the needle tube cavity is provided with a conical dispensing groove. The needle tube is inserted into the needle tube cavity, the needle tube is in clearance fit with the needle tube cavity, and after the needle tube is inserted into the needle tube cavity, the needle tube is fixed by dispensing to the dispensing slot.

Preferably, the movable self-locking groove comprises a linear self-locking groove, an initial groove is arranged on one side of the linear self-locking groove, and the initial groove is communicated with the middle part of the linear self-locking groove through a communicating groove; the two sides and the end part of the bottom of the initial chute close to one end of the bottom of the needle seat are separated from the telescopic sleeve main body, the end part of the telescopic sleeve corresponding to the initial chute is open, and an initial limiting table is arranged at the end part of the bottom of the initial chute close to one end of the bottom of the needle seat; the two sides and the end of the bottom of the straight line self-locking sliding chute close to one end of the bottom of the needle seat are separated from the telescopic sleeve main body, the bottom end of the straight line self-locking sliding chute close to one end of the bottom of the needle seat is provided with a self-locking limiting table, and a locking hole is arranged between the self-locking limiting table and the telescopic sleeve main body along the sliding direction of the straight line self-locking sliding chute.

Smooth transition is realized between the initial chute and the communicating chute and between the communicating chute and the linear self-locking chute; the movable self-locking grooves are arranged in two, the two movable self-locking grooves are respectively arranged on two sides of the telescopic sleeve, and the two movable self-locking grooves are respectively matched with one boss. Because the two sides and the end parts of the bottom of the straight line self-locking chute and the end part of the initial chute, which are close to one end of the bottom of the needle seat, are separated from the telescopic sleeve main body, the self-locking chute and the initial chute are close to the bottom of the needle seat, and can elastically deform under the condition of certain force; the end part of the telescopic sleeve corresponding to the initial sliding groove is in an open shape, so that the boss and the initial sliding groove are convenient to assemble, the boss slides onto the initial sliding groove from the opening of the end part of the telescopic sleeve corresponding to the initial sliding groove during assembling, and when the boss passes over the initial limiting table, the bottom of the end, close to the bottom of the needle seat, of the initial sliding groove is elastically deformed to a certain extent.

In the initial state, the boss is positioned at one end of the initial chute close to the initial limiting table, when the telescopic sleeve is extruded and retracted during injection and needle insertion, the boss slides into the communicating chute along the initial chute and finally slides to one end of the linear self-locking chute, and at the moment, needle insertion is completed; after the injection is finished, the product is pulled out, the telescopic sleeve is not stressed any more, the telescopic sleeve is sprung up under the action of spring force, the boss moves linearly along the linear self-locking sliding groove, the boss passes over the self-locking limiting table to be clamped in the locking hole under the action of spring force, and the relative position of the telescopic sleeve and the needle seat cannot change at the moment, so that the position locking of the telescopic sleeve is realized, namely the self-locking of the needle tube is realized, the needle tube is effectively prevented from accidentally injuring medical staff or patients, and an operator does not need to additionally operate.

Preferably, one side of the initial limiting table, which is away from the initial chute, is an inclined surface, and one side of the self-locking limiting table surface, which is opposite to the linear self-locking chute, is an inclined surface. One side of the initial limiting table, which is away from the initial sliding groove, is an inclined surface, so that the boss is convenient to gradually compress the initial limiting table, the initial limiting table is finally assembled on the initial sliding groove beyond the initial limiting table, the other side surface of the initial limiting table is an upright surface, the reverse movement of the boss is limited, and the boss is ensured not to slip from the initial sliding groove; the side of the self-locking limiting table surface, which is opposite to the linear self-locking sliding groove, is an inclined surface, so that the boss can conveniently slide into the locking hole along the linear self-locking sliding groove, and the other side surface of the self-locking limiting table surface is an upright surface, so that the boss can be prevented from sliding out of the locking hole. Because the boss can make sharp auto-lock spout tank bottom take place certain elastic deformation in the in-process of sliding into the locking hole, in order to not hinder sharp auto-lock spout tank bottom to take place elastic deformation, the needle file top position that corresponds sharp auto-lock spout tank bottom position is equipped with the breach, guarantees that the boss can slide into in the locking hole smoothly.

Preferably, the outer wall of the telescopic sleeve is provided with color blocks. The distance between the initial position of the boss on the initial sliding groove and the top end of the brake jacket is smaller than the distance between the locking hole and the top end of the brake jacket, so that in the initial state, the color block is hidden in the brake jacket, after the boss is sunk into the locking hole, the color block is exposed out of the brake jacket, and the anti-needling function for marking the product is started.

Preferably, a limiting protrusion is arranged on the bottom of the initial chute at one side of the initial limiting table, and the distance between the initial limiting table and the limiting protrusion is matched with the width of the boss. During assembly, the force is applied instantaneously, so that the boss slides between the limiting boss on the initial chute and the initial limiting table, and the external force is removed when the boss is blocked by the limiting boss; when the self-locking sliding groove is used, the boss can smoothly slide into the linear self-locking sliding groove beyond the limit bulge due to the fact that external force is applied again.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model has reasonable structural design, solves the problem that the needle tip is exposed, can effectively avoid acupuncture medical staff and patients, can automatically realize self-destruction after injection is finished, does not need additional operation, and improves the safety of the injection pen.

Drawings

FIG. 1 is a schematic view of a needle structure for an anti-needling injection pen;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is an exploded view of a needle for an anti-stick injection pen;

FIG. 4 is a schematic view of a telescopic sleeve structure I;

FIG. 5 is a second schematic view of the telescoping sheath;

fig. 6 is a schematic view of the needle holder;

FIG. 7 is a schematic illustration of a brake jacket construction;

fig. 8 is a second schematic view of the needle mount structure;

fig. 9 is a third schematic view of the needle mount structure;

fig. 10 is a schematic view of the structure of the housing.

In the figure: 1. a housing; 2. a needle tube; 3. a telescopic sleeve; 4. a brake jacket; 5. a needle stand; 6. a spring; 7. a mobile self-locking groove; 8. a straight line self-locking chute; 9. a communicating chute; 10. color blocks; 11. a limit protrusion; 12. an initial chute; 13. an initial limit table; 14. a locking hole; 15. a self-locking limit table; 16. a circular truncated cone ring; 17. vertical ribs; 18. a guide vertical groove; 19. a dispensing groove; 20. a notch; 21. a guide post; 22. a rotary groove; 23. transverse ribs; 24. a boss; 25. needle lumen.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

1-10, the needle head for the anti-needling injection pen comprises a shell 1 and a needle seat 5, wherein a needle tube cavity 25 is arranged in the needle seat 5, and a needle tube 2 is inserted into the needle tube cavity 25; the novel brake device further comprises a brake jacket 4 and a telescopic sleeve 3, wherein the needle seat 5 is arranged inside the brake jacket 4, the lower part of the needle seat 5 is in running fit with the lower part of the inner wall of the brake jacket 4, the lower part of the telescopic sleeve 3 is inserted into the upper part of the brake jacket 4, a boss 24 is arranged on the upper part of the inner wall of the brake jacket 4, and the boss 24 is inserted into the movable self-locking groove 7 of the lower part of the outer wall of the telescopic sleeve 3; a spring 6 is abutted between the telescopic sleeve 3 and the needle seat 5; the shell 1 wraps the brake jacket 4 and the telescopic sleeve 3, and the shell 1 is matched with the brake jacket 4 in a mounting way.

In this embodiment:

the lower part of the inner wall of the brake coat 4 is provided with a plurality of transverse ribs 23, the outer wall of the lower part of the needle seat 5 is provided with a rotary groove 22, the transverse ribs 23 are clamped in the rotary groove 22, and the transverse ribs 23 rotate along the rotary groove 22. When the boss 24 moves along the self-locking groove 7, no axial movement along the axis exists between the needle seat 5 and the brake jacket 4, and only relative rotation occurs between the needle seat 5 and the brake jacket.

The outer wall of the needle seat 5 is in a ladder shape, a guide post 21 is arranged in the small end of the needle seat 5, a needle tube cavity 25 is arranged in the guide post 21, and a spring 6 is sleeved on the periphery of the guide post 21; the outer wall of the small end of the needle seat 5 is provided with a guide vertical groove 18, the lower part of the inner wall of the telescopic sleeve 3 is provided with a vertical rib 17, and the vertical rib 17 is clamped in the guide vertical groove 18. In the process of contracting or popping up the telescopic sleeve 3, the vertical ribs 17 move up and down along the guide vertical grooves 18, and the cooperation of the vertical ribs 17 and the guide vertical grooves 18 plays a role in guiding the movement of the telescopic sleeve 3, so that the telescopic sleeve 3 and the needle seat 5 are prevented from rotating.

The top of the telescopic sleeve 3 is provided with a round platform ring 16, the round platform ring 16 is coaxial with the guide post 21, and the upper part of the spring 6 is sleeved on the periphery of the round platform ring 16. The two ends of the spring 6 are respectively sleeved on the peripheries of the guide post 21 and the round platform ring 16, so that the spring 6 can only axially compress or reset, a reverse acting force exists between the needle seat 5 and the telescopic sleeve 3, and the spring 6 is prevented from dislocation to influence the reset locking of the telescopic sleeve 3.

The top surface of the needle tube cavity 25 is provided with a conical dispensing groove 19. The needle tube 2 is inserted into the needle tube cavity 25, the needle tube is in clearance fit with the needle tube cavity 25, and after the needle tube 2 is inserted into the needle tube cavity 25, the needle tube 2 is fixed by dispensing to the dispensing slot 19.

The movable self-locking groove 7 comprises a linear self-locking chute 8, an initial chute 12 is arranged on one side of the linear self-locking chute 8, and the initial chute 12 is communicated with the middle part of the linear self-locking chute 8 through a communicating chute 9; both sides and the end of the bottom of the initial chute 12, which is close to one end of the bottom of the needle seat 5, are separated from the main body of the telescopic sleeve 3, the end of the telescopic sleeve 3 corresponding to the initial chute 12 is open, and the end of the bottom of the initial chute 12, which is close to one end of the bottom of the needle seat 5, is provided with an initial limiting table 13; the two sides and the end of the bottom of the straight line self-locking chute 8, which is close to one end of the bottom of the needle seat 5, are separated from the main body of the telescopic sleeve 3, the bottom end of the straight line self-locking chute 8, which is close to one end of the bottom of the needle seat 5, is provided with a self-locking limit table 15, and a locking hole 14 is arranged between the self-locking limit table 15 and the main body of the telescopic sleeve 3 along the sliding direction of the straight line self-locking chute 8.

Smooth transition is realized between the initial chute 12 and the communication chute 9, and between the communication chute 9 and the linear self-locking chute 8; the two movable self-locking grooves 7 are arranged on two sides of the telescopic sleeve 3 respectively, and the two movable self-locking grooves 7 are matched with one boss 24 respectively. Because the two sides and the end part of the bottom of the straight line self-locking chute 8 and the end part of the initial chute 12, which are close to one end of the bottom of the needle seat 5, are separated from the main body of the telescopic sleeve 3, the self-locking chute and the initial chute 12, which are close to the bottom of one end of the bottom of the needle seat 5, can elastically deform under the condition of certain force; the end part of the telescopic sleeve 3 corresponding to the initial sliding groove 12 is in an open shape, so that the boss 24 and the initial sliding groove 12 are conveniently assembled, the boss 24 slides onto the initial sliding groove 12 from the opening of the end part of the telescopic sleeve 3 corresponding to the initial sliding groove 12 during assembly, and when the boss 24 passes over the initial limiting table 13, the bottom of the end, close to the bottom of the needle seat 5, of the initial sliding groove 12 is elastically deformed to a certain extent.

In the initial state, the boss 24 is positioned at one end of the initial chute 12 close to the initial limiting table 13, when the telescopic sleeve 3 is extruded and retracted during injection and needle insertion, the boss 24 slides into the communicating chute 9 along the initial chute 12, and finally slides to one end of the linear self-locking chute 8, and at the moment, needle insertion is completed; after the injection is finished, the product is pulled out, the telescopic sleeve 3 is not stressed any more, under the action of the elastic force of the spring 6, the telescopic sleeve 3 is sprung up, the boss 24 moves linearly along the linear self-locking sliding chute 8, and the boss 24 passes over the self-locking limiting table 15 and is clamped in the locking hole 14 under the action of the elastic force of the spring 6, at the moment, the relative position of the telescopic sleeve 3 and the needle seat 5 cannot change, so that the position locking of the telescopic sleeve 3 is realized, namely the self-locking of the needle tube 2 is realized, the accidental puncture of medical staff or patients by the needle tube 2 is effectively avoided, and no additional operation of an operator is needed.

The side of the initial limiting table 13, which is away from the initial sliding groove 12, is an inclined surface, and the side of the self-locking limiting table 15, which faces the linear self-locking sliding groove 8, is an inclined surface. The side of the initial limiting table 13, which is away from the initial sliding groove 12, is an inclined surface, so that the boss 24 is convenient to gradually compress the initial limiting table 13, the initial limiting table 13 is finally assembled on the initial sliding groove 12 beyond the initial limiting table 13, the other side surface of the initial limiting table 13 is an upright surface, the reverse movement of the boss 24 is limited, and the boss 24 is ensured not to slip from the initial sliding groove 12; the side of the self-locking limiting platform 15 facing the linear self-locking sliding chute 8 is an inclined surface, so that the boss 24 can slide into the locking hole 14 along the linear self-locking sliding chute 8, and the other side surface of the self-locking limiting platform 15 is an upright surface, so that the boss 24 is prevented from sliding out of the locking hole 14. Since the boss 24 can make the bottom of the linear self-locking chute 8 elastically deform to a certain extent in the process of sliding into the locking hole 14, in order not to hinder the bottom of the linear self-locking chute 8 from elastically deforming, a notch 20 is arranged at the top end position of the needle seat 5 corresponding to the bottom of the linear self-locking chute 8, so that the boss 24 can slide into the locking hole 14 smoothly.

The outer wall of the telescopic sleeve 3 is provided with a color block 10. The distance between the initial position of the boss 24 on the initial chute 12 and the top end of the brake jacket 4 is smaller than the distance between the locking hole 14 and the top end of the brake jacket 4, so that in the initial state, the color block 10 is hidden in the brake jacket 4, and after the boss 24 is sunk into the locking hole 14, the color block 10 is exposed out of the brake jacket 4, and the anti-needling function for marking the product is started.

The bottom of the initial chute 12 on one side of the initial limiting table 13 is provided with a limiting protrusion 11, and the distance between the initial limiting table 13 and the limiting protrusion 11 is matched with the width of the boss 24. During assembly, the force is applied instantaneously, so that the boss 24 slides between the limiting boss 11 on the initial chute 12 and the initial limiting table 13, and the external force is removed when the boss is blocked by the limiting boss 11; when the self-locking sliding groove is used, the boss 24 can slide into the linear self-locking sliding groove 8 beyond the limit boss 11 smoothly due to the fact that external force is applied again.

The inner wall of the shell 1 is provided with reinforcing ribs which are in interference fit with the brake jacket 4; when in use, the needle seat 5 is in threaded connection and fixation with a product, the outer shell 1 is taken down by destroying the interference fit between the outer shell 1 and the brake outer sleeve 4 through external force, and the telescopic sleeve 3 is exposed; when in injection, the product is pressed, the telescopic sleeve 3 moves along the axis, the corresponding boss 24 moves to one end along the moving self-locking groove 7, the spring 6 is compressed in the process, and the needle tube 2 penetrates out of the telescopic sleeve 3 and is pricked into a patient to complete injection; after injection is completed, the product is pulled out, the telescopic sleeve 3 moves reversely along the axis under the action of the spring 6, the boss 24 moves reversely from the locking groove 7 to the other end to realize self-locking clamping, the telescopic sleeve 3 can not move any more, and at the moment, the tip of the needle tube 2 is wrapped in the telescopic sleeve 3. The product is before and after the use, and needle tubing 2 pointed end all is in telescopic cover 3 inside, effectively plays the anti-needle effect, and under the effect of spring 6, boss 24 can by oneself by the chucking need not other extra operations, convenient to use is simple.

Claims (9)

1. The utility model provides a prevent needle for injection pen syringe needle, includes shell (1) and needle file (5), and needle file (5) inside is equipped with needle tubing chamber (25), has inserted needle tubing (2), its characterized in that in needle tubing chamber (25): the novel anti-theft brake comprises a brake sleeve (4) and a telescopic sleeve (3), wherein a needle seat (5) is arranged in the brake sleeve (4), the lower part of the needle seat (5) is in running fit with the lower part of the inner wall of the brake sleeve (4), the lower part of the telescopic sleeve (3) is inserted into the upper part of the brake sleeve (4), a boss (24) is arranged on the upper part of the inner wall of the brake sleeve (4), and the boss (24) is inserted into a movable self-locking groove (7) on the lower part of the outer wall of the telescopic sleeve (3); a spring (6) is abutted between the telescopic sleeve (3) and the needle seat (5); the shell (1) wraps the brake jacket (4) and the telescopic sleeve (3), and the shell (1) is matched with the brake jacket (4) in a mounting way.

2. The needle for an anti-puncture type injection pen according to claim 1, wherein: the lower part of the inner wall of the brake coat (4) is provided with a plurality of transverse ribs (23), the outer wall of the lower part of the needle seat (5) is provided with a rotary groove (22), the transverse ribs (23) are clamped in the rotary groove (22), and the transverse ribs (23) rotate along the rotary groove (22).

3. The needle for an anti-puncture type injection pen according to claim 1, wherein: the outer wall of the needle seat (5) is in a ladder shape, a guide post (21) is arranged in the small end of the needle seat (5), a needle tube cavity (25) is arranged in the guide post (21), and a spring (6) is sleeved on the periphery of the guide post (21); the outer wall of the small end of the needle seat (5) is provided with a guide vertical groove (18), the lower part of the inner wall of the telescopic sleeve (3) is provided with a vertical rib (17), and the vertical rib (17) is clamped in the guide vertical groove (18).

4. A needle for an anti-needle stick injection pen according to claim 3, wherein: the top of the telescopic sleeve (3) is provided with a round platform ring (16), the round platform ring (16) is coaxial with the guide column (21), and the upper part of the spring (6) is sleeved on the periphery of the round platform ring (16).

5. The needle for an anti-puncture type injection pen according to claim 1, wherein: the top surface of the needle tube cavity (25) is provided with a conical dispensing groove (19).

6. The needle for a needle-stick resistant injection pen according to any one of claims 1-5, wherein: the movable self-locking groove (7) comprises a linear self-locking sliding groove (8), an initial sliding groove (12) is arranged on one side of the linear self-locking sliding groove (8), and the initial sliding groove (12) is communicated with the middle part of the linear self-locking sliding groove (8) through a communicating sliding groove (9); both sides and the end of the bottom of the groove, which is close to one end of the bottom of the needle seat (5), of the initial sliding groove (12) are separated from the main body of the telescopic sleeve (3), the end of the telescopic sleeve (3) corresponding to the initial sliding groove (12) is open, and an initial limiting table (13) is arranged at the end of the bottom of the groove, which is close to one end of the bottom of the needle seat (5), of the initial sliding groove (12); the two sides and the end part of the bottom of the straight line self-locking chute (8) close to one end of the bottom of the needle seat (5) are separated from the main body of the telescopic sleeve (3), the end part of the bottom of the straight line self-locking chute (8) close to one end of the bottom of the needle seat (5) is provided with a self-locking limit table (15), and a locking hole (14) is arranged between the self-locking limit table (15) and the main body of the telescopic sleeve (3) along the sliding direction of the straight line self-locking chute (8).

7. The needle for an anti-puncture type injection pen according to claim 6, wherein: one side of the initial limiting table (13) deviating from the initial sliding groove (12) is an inclined surface, and one side of the self-locking limiting table (15) facing the linear self-locking sliding groove (8) is an inclined surface.

8. The needle for an anti-puncture type injection pen according to claim 6, wherein: the outer wall of the telescopic sleeve (3) is provided with a color block (10).

9. The needle for an anti-puncture type injection pen according to claim 6, wherein: the groove bottom of the initial chute (12) at one side of the initial limiting table (13) is provided with a limiting protrusion (11), and the distance between the initial limiting table (13) and the limiting protrusion (11) is matched with the width of the boss (24).