Needle for injection pen

Abstract

The utility model provides a needle head for an injection pen. The needle head for the injection pen comprises a needle seat, a needle tube and a needle tip sheath, the needle tip sheath comprises more than two first protruding blocks, and each first protruding block is connected to the first groove of the needle seat in a sliding mode. Therefore, a user can extrude the needle tip sheath to expose the needle tip of the needle tube. In addition, the user can pull up the needle tip sheath after injection, so that the needle tip of the needle tube is hidden again. When the needle tip sheath is pulled upwards to the top of the needle base, the needle tip sheath can be rotated, so that each first convex block is clamped into one second groove. And the second substrate of the clamping column is abutted against the square notch of the first bump, so that the needle tip sheath is prevented from being reversely rotated.

Description

Technical Field

[0001] The utility model relates to the technical field of needles for injection pens, in particular to a needle for an injection pen. Background Art

[0002] In the prior art, as a method for treating diabetes, a certain amount of insulin needs to be injected into the patient. In order to achieve the above effect, a pen-type syringe such as a needle is usually used. The needle is a disposable needle with a safety protection device. The needle is used to inject liquid medicine into the body. Correct selection and use of the needle can ensure accurate injection of the medicine and also avoid discomfort or complications during the injection process. The structure of the needle usually includes a needle tip, a needle tube, a needle seat and a needle tip sheath.

[0003] The needle tip is the front end of the needle tube, usually a sharp tip, used to penetrate the skin and tissue. Needle tips come in different shapes and sizes to suit different injection purposes. The needle tube is the part that connects the needle tip and the needle seat, usually a hollow tubular structure. Liquid drugs or samples can flow in or out of the needle tube. The needle seat is usually a cylindrical container made of transparent plastic or glass, which is used to hold liquid drugs such as insulin. The needle seat is also used to fix the needle tube so that the user can inject the drug into the patient by holding the needle seat. Before the needle tube injects liquid drugs such as insulin into the patient's body, the needle tip sheath can prevent the needle tip from being contaminated and prevent the sharp needle tip from causing harm to the user. At the same time, the needle tip sheath needs to be set to a detachable or movable structure so that the needle tube can smoothly expose the needle tip when in use. After the needle tube injects liquid drugs such as insulin into the patient's body, the disposable needle tube will be discarded.

[0004] After the needle tube has completed the injection of the patient, the needle tip sheath is squeezed, exposing the needle tip of the needle tube. Although the needle tube has completed the injection task, the exposed needle tip is likely to cause secondary harm to the user or others after being abandoned. At the same time, there is usually residual liquid medicine in the needle tip, which is likely to cause environmental pollution or safety risks to others. Utility Model Content

[0005] The utility model aims to provide a needle for an injection pen to solve the technical problem that the needle tube in the prior art has potential safety hazards after being abandoned.

[0006] In order to solve the above problems, the utility model provides a needle for an injection pen, which includes a needle seat. The needle seat includes a base, a needle tube sleeve and more than two clamping columns. The needle tube sleeve is arranged on the top of the base. Each clamping column is arranged on the top of the base, and a plurality of clamping columns are arranged around the needle tube sleeve, so that there is a gap between each clamping column and the needle tube sleeve. The needle for an injection pen also includes a needle tube and a needle tip sheath. The needle tube passes through the needle tube sleeve and extends from the top of the needle tube sleeve to the bottom of the needle tube sleeve. The needle tip sheath can be slidably mounted to the needle seat.

[0007] Furthermore, each card column includes a first groove and a second groove, and the first groove and the second groove of each card column are jointly surrounded by the card column and an adjacent card column; the needle tip shield includes: more than two first protrusions, each first protrusion can be slidably connected to a first groove; when each first protrusion is located at the top of a first groove, the needle tip shield can be rotated so that each first protrusion is engaged with a second groove.

[0008] Furthermore, the card column includes a first substrate, a second substrate and a connecting plate. The first substrate is arc-shaped and is disposed on the top of the base; a concave portion is provided on one side of the top of the first substrate. The second substrate is arc-shaped and is disposed on the top of the base; the second substrate is disposed opposite to the first substrate on the side facing the needle cannula. The connecting plate extends from a side edge of the first substrate to the middle of the second substrate; a second substrate of each card column, a connecting plate of the card column and a first substrate of an adjacent card column together form the first groove; a concave portion of a first substrate of each card column and a second substrate of an adjacent card column together form the second groove.

[0009] Furthermore, the first protrusion is provided with a square notch, and when the needle tip shield is rotated so that each first protrusion is engaged with a second groove, the second substrate abuts against the square notch.

[0010] Furthermore, the needle tip shield comprises a first tube body, a second tube body and a top cover. The first tube body can be slidably mounted to the gap; the second tube body can be slidably mounted to the surface of each clamping column away from the needle cannula; the top cover extends from the edge of the top of the first tube body to the edge of the top of the second tube body.

[0011] Furthermore, the needle tube sleeve is provided with a first through hole, and the first through hole extends from the top of the needle tube sleeve to the bottom of the needle tube sleeve; the needle tube passes through the first through hole and extends to the inside of the base.

[0012] Furthermore, the needle seat also includes at least one second protrusion, each second protrusion protrudes from the circumferential outer wall of the needle tube sleeve at equal intervals and is arranged on the same circumference; each second protrusion abuts against the inner wall of the needle tip sleeve.

[0013] Furthermore, a strip-shaped groove is provided on the surface of each clamping column facing the needle tube sleeve, and each strip-shaped groove extends from the bottom of a clamping column to the middle of the clamping column.

[0014] Furthermore, the second tube body of the needle tip shield is provided with a strip-shaped notch, and the strip-shaped notch is arranged opposite to the strip-shaped groove; the needle tip shield also includes a third protrusion, and the third protrusion protrudes from the bottom of the strip-shaped notch; when each first protrusion slides to the bottom of a first groove, the third protrusion is engaged with the strip-shaped groove.

[0015] Furthermore, at least one strip-shaped protrusion is provided on the outer surface of the base; each strip-shaped protrusion extends from the bottom of the base to the top of the base.

[0016] Furthermore, the outer surface of the needle tip shield is provided with at least one protrusion.

[0017] Furthermore, the injection pen needle also includes a needle seat shield, and the needle seat shield is arranged on the outer surface of the needle seat.

[0018] The utility model has the advantages of providing a needle for an injection pen, which includes a needle seat, a needle tube and a needle tip shield. The needle tip shield includes more than two first protrusions, each of which is slidably connected to a first groove of the needle seat. The user can squeeze the needle tip shield to expose the needle tip of the needle tube, thereby injecting liquid medicine into the patient's body. The user can also pull up the needle tip shield after injection, so that the needle tip of the needle tube is hidden again, preventing the needle tube from being abandoned. When the needle tip shield is pulled up to the top of the needle seat, the needle tip shield can be rotated so that each first protrusion is engaged with a second groove. The second substrate of the clamping column is abutted against the square notch of the first protrusion to prevent the needle tip shield from being rotated in the reverse direction. The user can rotate and lock the needle tip shield of the injection pen needle after use, so that the needle tip of the needle tube is always in a hidden state, completely eliminating the safety hazard of the needle tube after being abandoned. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the needle for the injection pen in Example 1;

[0020] Figure 2 This is a schematic diagram of the exploded structure of the needle for the injection pen in Example 1;

[0021] Figure 3 It is a schematic diagram of the overall structure of the needle seat in Example 1;

[0022] Figure 4 is a top view of the needle holder in Example 1;

[0023] Figure 5 This is a schematic diagram of the overall structure of the clamping column in Example 1;

[0024] Figure 6 The overall structure of the needle tip sheath in Example 1 is shown in FIG. Figure 1 ;

[0025] Figure 7 The overall structure of the needle tip sheath in Example 1 is shown in FIG. Figure 2 ;

[0026] Figure 8 This is a schematic diagram of the structure of the injection pen needle in Example 1 when it is not in use;

[0027] Fig. 9 is a transverse cross-sectional view of the injection pen needle in Example 1 when it is not in use;

[0028] Fig.10 is a transverse cross-sectional view of the needle tip shield after being pressed down in Example 1;

[0029] Fig.11 is a transverse cross-sectional view of the needle tip shield after being rotationally locked in Example 1;

[0030] Fig.12 Schematic diagram of the overall structure of the strip notch and the third protrusion in Example 1;

[0031] Fig.13 is a longitudinal cross-sectional view of the needle tip sheath in Example 1;

[0032] Fig.14 This is a schematic diagram of the overall structure of the injection pen needle with a needle seat sheath in Example 1;

[0033] Fig.15 This is a schematic diagram of the overall structure of the needle for the injection pen in Example 2;

[0034] Fig.16 This is a schematic diagram of the overall structure of the needle tip sheath in Example 2;

[0035] Fig.17 Schematic diagram of the overall structure of the needle seat in Example 2.

[0036] The numbers in the figure are as follows:

[0037] 1 needle seat, 2 needle tube, 3 needle tip sheath, 4 needle seat sheath,

[0038] 11 base, 12 needle tube sleeve, 13 clamping column, 14 gap, 31 first tube body,

[0039] 32 second tube body, 33 top cover, 34 strip notch, 35 third protrusion, 36 connecting piece,

[0040] 111 strip-shaped bump, 121 first through hole, 122 second bump, 131 first substrate,

[0041] 132 second substrate, 133 connecting plate, 134 first groove, 135 second groove,

[0042] 136 strip groove, 321 first convex block, 322 protrusion,

[0043] 1311 concave part, 3211 square notch. Specific embodiments

[0044] The following describes the preferred embodiments of the present invention with reference to the drawings in the specification, which are used to illustrate that the present invention can be implemented. These embodiments can fully introduce the technical content of the present invention to those skilled in the art, making the technical content of the present invention clearer and easier to understand. However, the present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0045] In the drawings, components with the same structure are indicated by the same numerical labels, and components with similar structures or functions are indicated by similar numerical labels. Directional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, upper surface, lower surface, side, top surface, bottom, front end, rear end, end, etc., are only directions in the drawings and are only used to explain and illustrate the present invention, but not to limit the scope of protection of the present invention.

[0046] In the drawings, components with the same structure are indicated by the same numerical reference numerals. When some components are described as being "on" another component, the component may be directly placed on the other component; there may also be an intermediate component on which the component is placed, and the intermediate component is placed on the other component. When a component is described as being "mounted to" or "connected to" another component, the two may be understood to be directly "mounted" or "connected", or one component may be indirectly "mounted to" or "connected to" another component through an intermediate component.

[0047] Example 1

[0048] like Figure 1 to Figure 2As shown, this embodiment provides a needle for an injection pen, and the needle for the injection pen includes a needle seat 1, a needle tube 2 and a needle tip shield 3. The needle seat 1 is usually a cylindrical container made of transparent plastic or glass, and is used to load liquid medicines such as insulin. The needle tube 2 is installed on the needle seat 1 and extends from the top of the needle seat 1 to the bottom of the needle seat 1. The needle seat 1 is also used to fix the needle tube, so that the user can inject the medicine into the patient's body by holding the needle seat 1. The needle tip shield 3 can be slidably installed on the needle seat 1 and covered by the needle tube 2. Before the needle tube 2 injects liquid medicines such as insulin into the patient's body, the needle tip shield 3 can prevent the needle tip from being contaminated and prevent the sharp needle tip from causing harm to the user. At the same time, the needle tip shield 3 can slide on the needle seat 1, so that the needle tube 2 can smoothly expose the needle tip when in use.

[0049] like Figure 3 , Figure 4 , Figure 5 , Figure 8 , Fig. 9 , Fig.10 as well as Fig.11 As shown, the needle seat 1 includes a base 11, a needle tube sleeve 12 and four clamping columns 13. The base 11 is cylindrical and hollow inside, and is used to contain liquid medicine, such as common insulin for treating diabetes. The outer surface of the base 11 is provided with at least one strip-shaped protrusion 111. Each strip-shaped protrusion 111 extends from the bottom of the base 11 to the top of the base 11. The strip-shaped protrusion 111 increases the friction between the needle of the injection pen and the user's hand, preventing the user's hand from slipping when holding the needle of the injection pen. The needle tube sleeve 12 is arranged on the top of the base, and the needle tube sleeve 12 is provided with a first through hole 121, and the first through hole 121 extends from the top of the needle tube sleeve 12 to the bottom of the needle tube sleeve 12. The first through hole 121 is used to install the needle tube 2, so that the needle tube 2 passes through the first through hole 121 and extends to the inside of the base. The needle seat 1 also includes at least one second protrusion 122, each second protrusion 122 protrudes from the circumferential outer wall of the needle tube sleeve 12 at equal intervals and is arranged on the same circumference. Each second protrusion 122 abuts against the inner wall of the needle tip shield 3. The function of the second protrusion 122 is to eliminate the radius difference between the inner wall of the needle tip shield 3 and the outer wall of the needle tube sleeve 12, and to prevent the needle tip shield 3 from shaking when sliding due to its inner diameter being greater than the outer diameter of the needle tube sleeve 12. In this embodiment, the top of the needle tube sleeve 12 is sealed and fixed with glue. The first point is to prevent the needle tube 2 from shaking during use and maintain the stability of the liquid drug when it is injected. The second point is to prevent the liquid drug from leaking, making the needle of the injection pen ineffective. The needle tube 2 is used to pierce the patient's skin and deliver the liquid drug into the patient's body.

[0050] The needle seat 1 also includes four posts 13, each of which is arranged on the top of the base, and the multiple posts 13 are arranged around the needle tube sleeve 12, so that there is a gap 14 between each post 13 and the needle tube sleeve 12. The post 13 includes a first substrate 131, a second substrate 132 and a connecting plate 133. The first substrate 131 is arc-shaped and is arranged on the top of the base. A concave portion 1311 is provided on one side of the top of the first substrate 131. The second substrate 132 is arc-shaped and is arranged on the top of the base. The second substrate 132 is arranged opposite to the first substrate 131 on the side facing the needle tube sleeve 12. The connecting plate 133 extends from a side edge of the first substrate 131 to the middle of the second substrate 132. A second substrate 132 of each post 13, a connecting plate 133 of the post 13 and a first substrate 131 of an adjacent post 13 together form a first groove 134. The lower recess 1311 of a first substrate 131 of each post 13 and a second substrate 132 of an adjacent post 13 together form a second groove 135 .

[0051] The first groove 134 is used to realize the slidable function of the needle tip shield 3. The needle tip shield 3 is slidably mounted to the first groove 134, so that the user can squeeze the needle tip shield 3 to expose the needle tip of the needle tube 2, thereby injecting the liquid medicine into the patient's body. The user can also pull up the needle tip shield 3 after the injection, so that the needle tip of the needle tube 2 is hidden again, preventing the needle tube 2 from still having safety hazards after being abandoned. The second groove 135 is used to realize the rotation locking function of the needle tip shield 3. When the needle tip shield 3 is pulled up to the top of the needle seat 1, the needle tip shield 3 can be rotated so that the needle tip shield 3 is engaged with a second groove 135. And the second substrate 132 of the clamping column 13 is abutted against the square notch 3211 of the first protrusion 321 to prevent the needle tip shield 3 from being rotated in the reverse direction. The user can rotate and lock the needle tip shield 3 of the injection pen needle after use, so that the needle tip of the needle tube 2 is always in a hidden state, completely eliminating the potential safety hazard of the needle tube 2 after being abandoned.

[0052] like Figures 6 to 11As shown, the needle tip shield 3 includes a first tube body 31, a second tube body 32 and a top cover 33. The first tube body 31 is slidably mounted to the gap 14. The second tube body 32 is slidably mounted to the surface of each clamping column 13 away from the needle tube sleeve 12. The outer surface of the second tube body 32 of the needle tip shield 3 is provided with at least one protrusion 322. The protrusion 322 on the outer surface of the second tube body 32 increases the friction between the injection pen needle and the user's hand, preventing the user's hand from slipping when holding the injection pen needle. The top cover 33 extends from the edge of the top of the first tube body 31 to the edge of the top of the second tube body 32. The needle tip shield 3 includes four first protrusions 321, each of which protrudes from the surface of the second tube body 32 facing the first tube body 31, and each of which is located at the bottom of the second tube body 32. Each first protrusion 321 is slidably connected to a first groove 134. When each first protrusion 321 slides in the first groove 134, the user can squeeze the needle tip shield 3 to expose the needle tip of the needle tube 2, thereby injecting the liquid medicine into the patient's body. The user can also pull up the needle tip shield 3 after the injection so that the needle tip of the needle tube 2 is hidden again, preventing the needle tube 2 from still having safety hazards after being abandoned. When each first protrusion 321 is located at the top of a first groove 134, the needle tip shield 3 can be rotated so that each first protrusion 321 is engaged with a second groove 135. The first protrusion 321 is provided with a square notch 3211. When the needle tip shield 3 is rotated so that each first protrusion 321 is engaged with a second groove 135, the second substrate 132 abuts against the square notch 3211. Prevent the needle tip shield 3 from being rotated in the reverse direction. The user can rotate and lock the needle tip shield 3 of the injection pen needle after use, so that the needle tip of the needle tube 2 is always in a hidden state, completely eliminating the safety hazards of the needle tube 2 after being abandoned. At the same time, each first protrusion 321 abuts against a lower recess 1311 of a first substrate 131, so that each first protrusion 321 cannot slide in the vertical direction. The above function shows that when the user injects liquid medicine into the patient's body, the user can pull out the needle tip shield 3, so that the needle tip of the needle tube 2 is hidden by the needle tip shield 3. At the same time, the needle tip shield 3 can be rotated by the user, so that each first protrusion 321 rotates to a second groove 135, and the reversal of the needle tip shield 3 is constrained. At the same time, since each first protrusion 321 cannot slide in the vertical direction, the needle tip shield 3 is fixed after rotation, so that the needle tip of the needle tube 2 is always in a hidden state.

[0053] like Figure 12 to Figure 13As shown, a strip groove 136 is provided on the surface of each clamping column 13 facing the needle tube sleeve 12, and each strip groove 136 extends from the bottom of a clamping column 13 to the middle of the clamping column 13. The second tube body 32 of the needle tip shield 3 is provided with a strip notch 34, and the strip notch 34 is arranged opposite to the strip groove 136. The needle tip shield 3 also includes a third protrusion 35, and the third protrusion 35 protrudes from the bottom of the strip notch 34. When each first protrusion 321 slides to the bottom of a first groove 134, the third protrusion 35 is engaged with the strip groove 136. When the user injects the liquid medicine into the patient's body, the needle tip shield 3 is pressed down by the reaction force of the patient, and at this time, each first protrusion 321 slides to the bottom of a first groove 134, and the third protrusion 35 is engaged with the strip groove 136. The user can pull the needle tip shield 3 upward, so that the needle tip of the needle tube 2 is hidden by the needle tip shield 3. At this time, each first protrusion 321 slides upward from the bottom of the first slot 134 and causes the third protrusion 35 to escape from the strip-shaped groove 136 .

[0054] like Fig.14 As shown, the needle for the injection pen further includes a needle seat sheath 4, which is covered on the outer surface of the needle seat 1. The needle seat sheath 4 is used to protect the needle tube 2 and the needle seat 1, prevent the leakage of liquid medicine, and prevent the needle tube 2 and the needle seat 1 from being damaged.

[0055] like Figures 1 to 14 As shown, in an actual situation, when the injection pen needle of the present embodiment is not in use, the third protrusion 35 abuts against the surface of a clamping column 13 facing the needle tube 2, so that the friction between the needle tip shield 3 and the needle seat 1 is increased, thereby preventing the needle tip shield 3 from sliding down due to vibration during transportation or natural gravity, thereby preventing the needle tip from being exposed.

[0056] When the user uses the injection pen needle of the utility model, he only needs to point the needle tube 2 toward the patient and apply pressure so that the needle tube 2 can be inserted into the patient's body. At the same time, the needle tip shield 3 is subjected to the reaction force from the patient's skin, which can drive the needle tip shield 3 to move radially relative to the needle seat 1, so that the needle tip shield 3 slides toward the base.

[0057] After the needle of the injection pen is used, the user needs to pull out the needle tip shield 3 to reset it because the needle tip is exposed. When the user successfully restores the needle tip shield 3 to its initial position, the needle tip shield 3 surrounds the needle tip of the needle tube 2 again, thereby preventing the needle tip of the needle tube 2 from being exposed, thereby preventing the sharp needle tip of the needle tube 2 from causing secondary harm to the user or other people after being abandoned. When each first protrusion 321 is located at the top of a first groove 134, the needle tip shield 3 can be rotated so that each first protrusion 321 is engaged with a second groove 135. The first protrusion 321 is provided with a square notch 3211. When the needle tip shield 3 is rotated so that each first protrusion 321 is engaged with a second groove 135, the second substrate 132 abuts against the square notch 3211 to prevent the needle tip shield 3 from being rotated in the reverse direction. At the same time, each first protrusion 321 abuts against a lower recess 1311 of a first substrate 131, so that each first protrusion 321 cannot slide in the vertical direction, so that the user can rotate and lock the needle tip sheath 3 of the injection pen needle after use, so that the needle tip of the needle tube 2 is always in a hidden state, completely eliminating the safety hazard of the needle tube 2 after being abandoned.

[0058] The advantage of this embodiment is that it provides a needle for an injection pen, which includes a needle seat, a needle tube and a needle tip shield. The needle tip shield includes more than two first protrusions, each of which is slidably connected to a first groove of the needle seat. The user can squeeze the needle tip shield to expose the needle tip of the needle tube, thereby injecting liquid medicine into the patient's body. The user can also pull up the needle tip shield after injection, so that the needle tip of the needle tube is hidden again, preventing the needle tube from still having safety hazards after being abandoned. When the needle tip shield is pulled up to the top of the needle seat, the needle tip shield can be rotated so that each first protrusion is engaged with a second groove. And the second substrate of the clamping column is abutted against the square notch of the first protrusion to prevent the needle tip shield from being rotated in the reverse direction. The user can rotate and lock the needle tip shield of the injection pen needle after use, so that the needle tip of the needle tube is always in a hidden state, completely eliminating the safety hazards of the needle tube after being abandoned.

[0059] Example 2

[0060] like Figures 15 to 17As shown, Example 2 includes most of the technical features of Example 1. The difference between Example 2 and Example 1 is that the first tube body and the second tube body of this embodiment are not connected through the top cover in Example 1, and the needle tip sheath of this embodiment includes three connecting pieces 36, each of which extends from the outer wall of the first tube body 31 to the inner wall of the second tube body 32. This embodiment does not include the second substrate in Example 1. The first substrate 131 of this embodiment and the adjacent first substrate jointly surround the first groove 134. Other components of this embodiment not mentioned in the above text are the same as those of Example 1, and will not be repeated here.

[0061] The needle tip shield of this embodiment includes three connecting members 36, each of which extends from the outer wall of the first tube body 31 to the inner wall of the second tube body 32. The first substrate 131 of this embodiment and the adjacent first substrates enclose the first groove 134 together.

[0062] The advantage of this embodiment is that the needle tip sheath and the holder of the injection pen needle are integrated into one component, so that multiple components of the injection pen needle are integrated into one component, which simplifies the manufacturing difficulty of the injection pen needle. At the same time, the structure of the holder column of the needle holder is simplified, and the production cost of the injection pen needle is reduced.

[0063] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A needle for an injection pen, characterized in that: include: A needle seat, the needle seat comprising: abutment; a needle cannula, the needle cannula being disposed on the top of the base; and More than two clamping columns, each clamping column is arranged on the top of the base, and the plurality of clamping columns are arranged around the needle tube sleeve, and a gap is formed between each clamping column and the needle tube sleeve; The injection pen needle also includes: a needle tube, the needle tube passing through the needle tube sleeve and extending from the top of the needle tube sleeve to the bottom of the needle tube sleeve; and A needle tip shield is slidably mounted to the needle seat.

2. The needle for an injection pen according to claim 1, characterized in that: Each clamping column includes a first groove and a second groove, and the first groove and the second groove of each clamping column are surrounded by the clamping column and an adjacent clamping column; The needle tip sheath comprises: Two or more first protrusions, each of which is slidably connected to a first groove; When each first protrusion is located at the top of a first groove, the needle tip shield can be rotated so that each first protrusion is engaged with a second groove.

3. The needle for an injection pen according to claim 2, characterized in that: The clamping column comprises: A first substrate, which is arc-shaped and disposed on the top of the base; a concave portion is disposed on one side of the top of the first substrate; A second substrate, which is arc-shaped and disposed on the top of the base; the second substrate is disposed opposite to the first substrate on a side facing the needle tube sleeve; A connecting plate extending from a side edge of the first substrate to a middle portion of the second substrate; A second substrate of each card post, a connecting plate of the card post, and a first substrate of an adjacent card post together form the first groove; The lower concave portion of a first substrate of each post and a second substrate of an adjacent post together form the second groove.

4. The needle for an injection pen according to claim 3, characterized in that: The first protrusion is provided with a square notch. When the needle tip shield is rotated so that each first protrusion is engaged with a second groove, the second substrate abuts against the square notch.

5. The needle for an injection pen according to claim 1, characterized in that: The needle tip sheath comprises: a first tube body, the first tube body being slidably mounted in the gap; A second tube body, the second tube body can be slidably mounted to a surface of each clamping column away from the needle tube sleeve; A top cover extends from an edge of the top of the first tube body to an edge of the top of the second tube body.

6. The needle for an injection pen according to claim 1, characterized in that: The needle cannula is provided with a first through hole, and the first through hole extends from the top of the needle cannula to the bottom of the needle cannula; The needle tube passes through the first through hole and extends into the interior of the base.

7. The needle for an injection pen according to claim 1, characterized in that: The needle seat also includes: At least one second protrusion protrudes from the circumferential outer wall of the needle tube sleeve at equal intervals and is arranged on the same circumference; each second protrusion abuts against the inner wall of the needle tip sleeve.

8. The needle for an injection pen according to claim 1, characterized in that: A strip-shaped groove is arranged on the surface of each clamping column facing the needle tube sleeve, and each strip-shaped groove extends from the bottom of a clamping column to the middle of the clamping column.

9. The needle for an injection pen according to claim 8, characterized in that: The second tube body of the needle tip sheath is provided with a strip-shaped notch, and the strip-shaped notch is arranged opposite to the strip-shaped groove; The needle tip sheath also includes: a third protrusion, the third protrusion protruding from the bottom of the strip-shaped notch; When each first protrusion slides to the bottom of a first groove, the third protrusion is engaged with the strip-shaped groove.

10. The needle for an injection pen according to claim 1, characterized in that: The outer surface of the base is provided with at least one strip-shaped protrusion; Each strip-shaped protrusion extends from the bottom of the base to the top of the base.

11. The needle for an injection pen according to claim 1, characterized in that: The outer surface of the needle tip shield is provided with at least one protrusion.

12. The needle for an injection pen according to claim 1, characterized in that: Also includes: The needle seat shield is arranged on the outer surface of the needle seat.

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