Disposable anti-acupuncture needle for injection pen

Abstract

A needle base comprises a first base body and a second base body, the second base body and the first base body are integrally formed, an elastic piece clamping tooth is arranged at the position, close to the second base body, of the first base body, and the upper end of the elastic piece clamping tooth is an inclined face. The needle tip sheath is positioned on the outer side of the second seat body, and a stop block is arranged on the outer wall of the lower part; the spring is limited by the needle tip sheath and the first seat body; the lower end of the clamping seat is rotatably connected with the needle seat, the inner wall of the lower portion of the clamping seat is provided with a sliding piece, the sliding piece and the clamping seat boss are integrally formed, one side face of the lower end of the sliding piece is an inclined face, the inclined face of the sliding piece and the inclined face of the elastic piece clamping tooth rotate in a matched mode, and the other side face of the lower end of the sliding piece is a vertically-arranged blocking face. The clamping seat is prevented from rotating; the needle seat sheath is positioned outside the first seat body, the needle tip sheath and the clamping seat, and the lower end is sealed by dialyzing paper; by means of the design of the elastic piece clamping teeth and the blocking face, movement and rotation of the needle point protection sleeve can be completely limited, and the comprehensive puncture prevention function is achieved.

Description

Technical Field

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

[0002] In view of hygiene requirements, commonly used non-disposable syringes need to be covered with a needle cover to protect the needle after use. Because the needle is very thin and the diameter of the needle cover is not large, it is easy to prick the fingers and cause infection to medical staff.

[0003] To address this issue, spring-loaded needle-stick-proof syringes have appeared on the market. After the injection is completed, continuing to push the piston will trigger the spring mechanism, which will bounce the injection needle back into the syringe. Although this can effectively prevent needlestick injuries, when drawing the liquid medicine, the piston needs to be pushed to the zero scale line to exhaust the air in the syringe, which is prone to false triggering, resulting in waste of medical equipment and delaying the injection time. Utility Model Content

[0004] The purpose of the utility model is to provide a disposable needle for an anti-puncture injection pen which is safer for nursing staff and patients and reduces production costs.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A disposable needle for an anti-puncture injection pen, characterized in that it comprises

[0007] The needle seat includes a first seat body at its bottom end and a second seat body at its center, the second seat body being integrally formed with the first seat body, the first seat body being provided with a plurality of spring clip teeth near the second seat body, the upper ends of the spring clip teeth being inclined upward from one end to the other end, and an annular groove being provided near the outer edge of the first seat body;

[0008] A needle tip shield is located on the outside of the second seat body, and a plurality of stoppers are provided on the outer wall of the lower portion of the shield;

[0009] a spring, located outside the second seat, with its upper and lower ends limited by the lower end of the needle tip shield and the upper end of the first seat;

[0010] The card seat is located outside the second seat body and the needle tip sheath,

[0011] Its lower end is embedded in the annular groove so as to be rotatably connected to the needle seat.

[0012] Its inner wall is provided with a plurality of card seat grooves and card seat bosses alternately along the circumferential direction. The card seat grooves are used to avoid the stopper, and the card seat bosses limit the lower end of the stopper.

[0013] The inner wall of the lower part is provided with a plurality of slides, which are integrally formed with the lower end of the card seat boss. One side surface of the lower end of the slide is an inclined surface that tilts upward from one end to the other end. The inclined surface of the slide rotates in coordination with the inclined surface of the spring clip teeth. The other side surface of the lower end of the slide is a vertically arranged card seat stop surface. After the inclined surface of the slide passes through the inclined surface of the spring clip teeth, the spring clip teeth bounce upward to limit the card seat stop surface to prevent the card seat from rotating.

[0014] The needle seat shield is located outside the first seat body, the needle tip shield and the clamping seat, with its upper end higher than the needle tip shield and its lower end sealed by dialysis paper.

[0015] Furthermore, the first seat body is provided with a plurality of needle seat stops, and the needle seat stops are located in the gap between the teeth of two adjacent spring pieces. The lower inner wall of the seat is provided with a plurality of seat protrusions, and the seat protrusions are close to the inclined surface of the slide. The seat protrusions cooperate with the needle seat stops, so that the slide of the seat rotates through the teeth of the needle seat and is stopped by the needle seat stop, and when the seat continues to rotate, it will drive the needle seat to rotate together.

[0016] Furthermore, a stop surface is vertically provided on one side of the needle seat stopper, and a convex surface is vertically provided on one end of the clamping seat protrusion, and the shapes of the convex surface and the stop surface match.

[0017] Furthermore, a guide slope is provided on the inner side of the needle seat stopper, and the guide slope cooperates with the outer edge of the spring, so that the spring is easily introduced into the first seat body.

[0018] Furthermore, a downwardly bent positioning block is provided on the outer edge of the stop block, and the positioning block cooperates with the upper end of the socket boss.

[0019] Furthermore, the upper end of the clamping seat boss is an inclined surface that slopes downward from the inside to the outside, so that the positioning block can be easily introduced into the clamping seat boss.

[0020] Furthermore, the other end of the elastic piece locking tooth is curved upward in an arc shape, so that after the inclined surface of the slide passes through the inclined surface of the elastic piece locking tooth, the other end of the elastic piece locking tooth can easily block the blocking surface of the base.

[0021] Furthermore, a needle seat boss is extended outward from the upper portion of the second seat body, and a shield groove is provided on the inner wall of the lower portion of the needle tip shield. The shield groove cooperates with the needle seat boss to prevent the needle tip shield from rotating around the needle seat.

[0022] Furthermore, a hook is provided on the inner wall of the lower end of the needle tip shield along the circumferential direction, and the hook cooperates with the needle seat boss to prevent the needle tip shield from falling off the needle seat.

[0023] Furthermore, a buckle is provided on the outer side of the annular groove, and a clamping platform is provided on the lower part of the clamping seat. The clamping platform cooperates with the buckle so that the clamping seat will not fall out after being inserted into the needle seat.

[0024] Furthermore, a convex bump is provided at the other end of the elastic piece locking tooth, and the convex bump is interference-fitted with a side surface of the sliding piece to prevent the holder from rotating and displacing in a free state.

[0025] Furthermore, the inner wall of the needle seat shield is provided with a plurality of vertical ribs, and the outer wall of the needle seat is provided with a plurality of needle seat vertical grooves. The positions of the needle seat vertical grooves and the vertical ribs are matched so that when the needle seat shield rotates, the needle seat is driven to be screwed into the injection pen together.

[0026] Furthermore, a plurality of card seat vertical grooves are provided on the outer wall of the card seat, and the card seat vertical grooves match the positions of the vertical ribs to prevent the card seat from rotating before use.

[0027] Furthermore, the vertical ribs include an upper vertical rib and a lower vertical rib formed integrally, the radial width of the upper vertical rib is greater than the radial width of the lower vertical rib, and the upper vertical rib and the lower vertical rib respectively cooperate with the outer walls of the card seat and the needle seat.

[0028] Furthermore, the first seat body includes an integrally formed upper seat body and a lower seat body, the outer diameter of the upper seat body is smaller than the outer diameter of the lower seat body, the lower vertical rib includes an integrally formed first lower vertical rib and a second lower vertical rib, the radial width of the first lower vertical rib is greater than the radial width of the second lower vertical rib, and the first lower vertical rib and the second lower vertical rib are respectively matched with the outer walls of the upper seat body and the lower seat body.

[0029] The spring structure of the utility model can quickly reset the needle tip sheath after use. The product is in a state of shielding the needle tip during the entire use process and does not leak out. The needle tip sheath has no other structure during the sliding process, and the spring force is designed to a comfortable force value for use.

[0030] The needle holder of the utility model is provided with multiple spring teeth with slope structures, and the holder is further provided with corresponding slopes, so that the needle can pass through the teeth of the holder smoothly when the holder is rotated. The holder is provided with a blocking surface on the opposite side of the corresponding slope. After the holder passes the tip of the teeth smoothly, the teeth will bounce up and be blocked by the blocking surface to stop the holder from rotating.

[0031] The needle holder of the utility model is provided with a convex stop surface, and the clamping seat is provided with a corresponding convex block. After the clamping seat rotates through the clamping teeth of the needle holder, it will continue to rotate and hit the convex stop of the needle holder. Then the rotation will drive the needle holder to rotate together, and the product will be removed from the injection pen, which is safe and reliable to use.

[0032] The utility model can completely restrict the movement and rotation of the needle tip shield, thereby achieving a comprehensive puncture prevention function. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1This is the overall structural diagram of the utility model;

[0034] Figure 2 It is a side sectional view of the utility model;

[0035] Figure 3 This is a bottom view of the needle tip shield of the present invention;

[0036] Figure 4 This is a bottom view of the card holder of the utility model;

[0037] Figure 5 This is a structural diagram of the needle seat of the utility model;

[0038] Figure 6 This is a structural diagram of the slide of the card seat of the utility model;

[0039] Figure 7 This is a structural diagram of the convex surface of the card holder of the utility model;

[0040] Figure 8 This is a schematic diagram of the buckle connection between the needle holder and the card holder of the utility model;

[0041] Figure 9 This is a structural diagram of the lower end of the needle tip sheath of the utility model;

[0042] Figure 10 This is a diagram of the internal structure of the needle seat sheath of the utility model;

[0043] Figure 11 This is a structural diagram of the vertical ribs of the needle seat sheath of the utility model;

[0044] Figure 12 This is the external structure diagram of the needle seat and the card seat of the utility model.

[0045] Reference numerals:

[0046] 1 needle seat, 2 needle tip sheath, 3 spring, 4 card seat, 5 needle seat sheath, 6 dialysis paper,

[0047] 101 first base body, 102 second base body, 1011 upper base body, 1012 lower base body,

[0048] 103 shrapnel teeth, 1031 convex hull,

[0049] 104 annular groove, 105 guide slope, 106 buckle, 107 needle seat stopper, 108 stop surface,

[0050] 109 needle seat boss, 110 needle seat vertical groove,

[0051] 201 stopper, 202 positioning block, 203 sheath groove, 204 hook,

[0052] 401 card table, 402 card seat groove, 403 card seat boss, 404 slide, 405 card seat stop surface,

[0053] 406 card seat convex block, 407 convex surface, 408 card seat vertical groove,

[0054] 501 vertical reinforcement, 502 upper vertical reinforcement, 503 lower vertical reinforcement,

[0055] 5031 first lower vertical reinforcement, 5032 second lower vertical reinforcement. DETAILED DESCRIPTION

[0056] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0057] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "up", "down", "left", and "right", generally refer to the up, down, left, and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0058] This application provides disposable needles for needle-stick-resistant injection pens, which are described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment in the following embodiments have their own specific focus. For details not detailed in one embodiment, please refer to the relevant descriptions of other embodiments.

[0059] Implementation example Figure 1 and Figure 2 As shown, it includes a needle seat 1, a needle tip shield 2, a spring 3, a holder 4 and a needle seat shield 5. The needle seat shield 5 is located on the outside of the needle seat 1, the needle tip shield 2 and the holder 4. The upper end of the needle seat shield 5 is higher than the needle tip shield 2, and the lower end of the needle seat shield 5 is sealed by dialysis paper 6.

[0060] The needle seat 1 includes a first seat body 101 located at its bottom end and a second seat body 102 located in its center. The second seat body 102 is integrally formed with the first seat body 101. The spring 3 is located on the outside of the second seat body 102. The upper and lower ends of the spring 3 are limited by the lower end of the needle tip sheath 2 and the upper end of the first seat body 101.

[0061] The holder 4 is located outside the second holder 102 and the needle tip shield 2. Figure 8 As shown, an annular groove 104 is provided near the outer edge of the first seat body 101, and the lower end of the card seat 4 is embedded in the annular groove 104 so that it is rotatably connected to the needle seat 1. A buckle 106 is provided on the outer side of the annular groove 104, and a card platform 401 is provided at the lower part of the card seat 4. The card platform 401 cooperates with the buckle 106 so that the card seat 4 will not fall out after being inserted into the needle seat 1.

[0062] like Figure 3 and Figure 4 As shown, the needle tip shield 2 is located on the outside of the second seat body 102, and the outer wall of the lower part of the needle tip shield 2 is provided with four blocks 201, and the inner wall of the upper part of the holder 4 is provided with four holder grooves 402 and four holder bosses 403 alternately along the circumferential direction. The holder grooves 402 are used to avoid the block 201 from interfering with the block 201, and the holder bosses 403 limit the lower end of the block 201. When in use, the holder 4 is rotated to press the holder bosses 403 against the lower end of the block 201 to achieve the purpose of preventing needle sticks.

[0063] like Figure 9 As shown, the outer edge of the stopper 201 is provided with a downwardly bent positioning block 202, which cooperates with the upper end of the base boss 403. The upper end of the base boss 403 is a slope that tilts downward from the inside to the outside, making it easy for the positioning block 202 to be introduced into the base boss 403.

[0064] like Figure 5 and Figure 6 As shown, the first base body 101 is provided with a plurality of elastic clip teeth 103 near the second base body 102, and the upper ends of the elastic clip teeth 103 are inclined surfaces inclined upward from one end to the other end. Four slides 404 are provided on the inner wall of the lower part of the base 4, and the slides 404 are integrally formed with the lower end of the base boss 403. One side surface of the lower end of the slide 404 is an inclined surface inclined upward from one end to the other end. The inclined surface of the slide 404 cooperates with the inclined surface of the elastic clip teeth 103 to rotate, and the other side surface of the lower end of the slide 404 is a vertically arranged base stop surface 405. Because the elastic clip teeth 103 are elastic, when the inclined surface of the slide 404 passes through the inclined surface of the elastic clip teeth 103, the elastic clip teeth 103 will bounce upward to limit the base stop surface 405 to prevent the base 4 from rotating.

[0065] The other end of the spring clip tooth 103 is curved upward, so that after the inclined surface of the slide 404 passes through the inclined surface of the spring clip tooth 103, the other end of the spring clip tooth 103 can easily block the card seat blocking surface 405. The other end of the spring clip tooth 103 is also provided with a convex bump 1031, which is interference fit with one side surface of the slide 404 to prevent the card seat 4 from rotating in a free state.

[0066] By designing the spring latch 103 of the needle seat 1 and the slide 404 and the stopper 201 of the seat 4, the movement and rotation of the needle tip shield 2 can be completely restricted, thereby achieving the function of preventing puncture injuries.

[0067] like Figure 5 、 Figure 6 and Figure 7 As shown, the first seat body 101 is provided with four needle seat stops 107, and the four needle seat stops 107 are located in the gap between two adjacent elastic sheet teeth 103. Four seat protrusions 406 are provided on the lower inner wall of the seat 4. The seat protrusions 406 are close to the inclined surface of the slide 404. The seat protrusions 406 cooperate with the needle seat stops 107. A stop surface 108 is vertically provided on one side of the needle seat stop 107, and a convex surface 407 is vertically provided on one end of the seat protrusion 406. The shapes of the convex surface 407 and the stop surface 108 are matched, so that the slide 404 of the seat 4 is stopped by the needle seat stop 107 after rotating through the elastic sheet teeth 103. Therefore, when the seat 4 continues to rotate, it will drive the needle seat 1 to rotate together.

[0068] like Figure 5 As shown, a guide slope 105 is provided on the inner side of the first seat body 101 . The guide slope 105 cooperates with the outer edge of the spring 3 , so that the spring 3 is easily introduced into the first seat body 101 .

[0069] like Figure 3 and Figure 5 As shown, four needle seat bosses 109 are extended outward from the upper part of the second seat body 102, and four sheath grooves 203 are provided on the inner wall of the lower part of the needle tip shield 2. The sheath grooves 203 cooperate with the needle seat bosses 109 to prevent the needle tip shield 2 from rotating around the needle seat 1.

[0070] like Figure 9 As shown, the inner wall of the lower end of the needle tip shield 2 is provided with a hook 204 along the circumferential direction, and the hook 204 is interference fit with the needle seat boss 109 so that the needle tip shield 2 does not fall off the needle seat 1.

[0071] like Figure 10 As shown, the inner wall of the needle seat sheath 5 is provided with four vertical ribs 501, and the outer wall of the needle seat 1 is provided with eight needle seat vertical grooves 110. The positions of the needle seat vertical grooves 110 and the vertical ribs 501 are matched so that when the needle seat sheath 5 rotates, the needle seat 1 is driven to be screwed into the injection pen together. The outer wall of the holder 4 is provided with eight holder vertical grooves 408. The holder vertical grooves 408 are matched with the positions of the vertical ribs 501 to prevent the holder 4 from rotating before use.

[0072] like Figure 11 As shown, the vertical rib 501 includes an integrally formed upper vertical rib 502 and a lower vertical rib 503. The radial width of the upper vertical rib 502 is greater than the radial width of the lower vertical rib 503. The upper vertical rib 502 and the lower vertical rib 503 cooperate with the outer walls of the card seat 4 and the needle seat 1 respectively.

[0073] like Figure 12 As shown, the first seat body 101 includes an integrally formed upper seat body 1011 and a lower seat body 1012, the outer diameter of the upper seat body 1011 is smaller than the outer diameter of the lower seat body 1012, the lower vertical rib 503 includes an integrally formed first lower vertical rib 5031 and a second lower vertical rib 5032, the radial width of the first lower vertical rib 5031 is greater than the radial width of the second lower vertical rib 5032, the first lower vertical rib 5031 and the second lower vertical rib 5032 respectively cooperate with the outer walls of the upper seat body 1011 and the lower seat body 1012, so that the inner wall of the needle seat sheath 5 is fully fitted with the outer walls of the needle seat 1 and the card seat 4.

[0074] The other structures and functions of the needle for the anti-needlestick injection pen provided in this embodiment correspond to the structures and functions implemented in the embodiment, so for other functions of this embodiment, please refer to the contents in the embodiment, and will not be described in detail here.

[0075] The above is a detailed introduction to the disposable needle-proof injection pen needle provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A disposable needle for an anti-puncture injection pen, characterized in that: include A needle seat (1) comprises a first seat body (101) located at its bottom end and a second seat body (102) located at its center, wherein the second seat body (102) and the first seat body (101) are integrally formed, and the first seat body (101) is provided with a plurality of spring clip teeth (103) near the second seat body (102), and the upper ends of the spring clip teeth (103) are inclined surfaces inclined upward from one end to the other end, and an annular groove (104) is provided near the outer edge of the first seat body (101); A needle tip shield (2) is located outside the second seat (102), and a plurality of stoppers (201) are provided on the outer wall of the lower portion of the shield; A spring (3) is located outside the second seat (102), with its upper and lower ends limited by the lower end of the needle tip shield (2) and the upper end of the first seat (101); The holder (4) is located outside the second holder (102) and the needle tip sheath (2). Its lower end is embedded in the annular groove (104) so ​​as to be rotatably connected to the needle seat (1). The inner wall is provided with a plurality of card seat grooves (402) and card seat bosses (403) alternately along the circumferential direction. The card seat grooves (402) are used to avoid the stopper (201), and the card seat bosses (403) limit the lower end of the stopper (201). The inner wall of the lower part thereof is provided with a plurality of slides (404), the slides (404) and the lower end of the card seat boss (403) are integrally formed, one side surface of the lower end of the slide (404) is an inclined surface inclined upward from one end to the other end, the inclined surface of the slide (404) rotates in coordination with the inclined surface of the spring clip tooth (103), the other side surface of the lower end of the slide (404) is a vertically arranged card seat stop surface (405) (108), after the inclined surface of the slide (404) passes through the inclined surface of the spring clip tooth (103), the spring clip tooth (103) bounces upward to limit the card seat stop surface (405) (108) to prevent the card seat (4) from rotating; The needle seat shield (5) is located outside the first seat body (101), the needle tip shield (2) and the holder (4), with its upper end higher than the needle tip shield (2) and its lower end sealed by dialysis paper (6).

2. The needle for the needle-stick-proof injection pen according to claim 1, characterized in that: The first seat body (101) is provided with a plurality of needle seat blocks (201) (107), and the needle seat blocks (201) (107) are located in the gap between two adjacent spring teeth (103). The lower inner wall of the seat (4) is provided with a plurality of seat protrusions (406), and the seat protrusions (406) are close to the inclined surface of the slide (404). The seat protrusions (406) cooperate with the needle seat blocks (201) (107), so that the slide (404) of the seat (4) is stopped by the needle seat blocks (201) (107) after rotating through the teeth of the needle seat (1). When the seat (4) continues to rotate, it will drive the needle seat (1) to rotate together.

3. The needle for the needle-stick-proof injection pen according to claim 2, characterized in that: A stop surface (108) is vertically provided on one side of the needle seat stopper (201) (107), and a convex surface (407) is vertically provided on one end of the clamping seat protrusion (406), wherein the convex surface (407) and the stop surface (108) are matched in shape.

4. The needle for the needle-stick-proof injection pen according to claim 2, characterized in that: A guide slope (105) is provided on the inner side of the needle seat stopper (201) (107), and the guide slope (105) cooperates with the outer edge of the spring (3), so that the spring (3) can be easily introduced into the first seat body (101).

5. The needle for the needle-stick-proof injection pen according to claim 1, characterized in that: The outer edge of the stopper (201) is provided with a downwardly bent positioning block (202), and the positioning block (202) cooperates with the upper end of the seat boss (403).

6. The needle for the needle-stick-proof injection pen according to claim 5, characterized in that: The upper end of the card seat boss (403) is a slope that slopes downward from the inside to the outside, so that the positioning block (202) can be easily introduced into the card seat boss (403).

7. The needle for the needle-stick-proof injection pen according to claim 1, characterized in that: The other end of the spring clip tooth (103) is curved upward, so that after the inclined surface of the slide (404) passes through the inclined surface of the spring clip tooth (103), the other end of the spring clip tooth (103) can easily block the seat blocking surface (405) (108).

8. The needle for the needle-stick-proof injection pen according to claim 1, characterized in that: The upper portion of the second seat body (102) is provided with a needle seat boss (109) extending outward, and the inner wall of the lower portion of the needle tip shield (2) is provided with a shield groove (203), and the shield groove (203) cooperates with the needle seat boss (109) to prevent the needle tip shield (2) from rotating around the needle seat (1).

9. The needle for the needle-stick-proof injection pen according to claim 8, characterized in that: The inner wall of the lower end of the needle tip shield (2) is provided with a hook (204) along the circumferential direction, and the hook (204) cooperates with the needle seat boss (109) to prevent the needle tip shield (2) from falling off the needle seat (1).

10. The needle for the needle-stick-proof injection pen according to claim 1, characterized in that: A buckle (106) is provided on the outside of the annular groove (104), and a clamping platform (401) is provided at the bottom of the clamping seat (4). The clamping platform (401) cooperates with the buckle (106) so that the clamping seat (4) does not fall out after being inserted into the needle seat (1).

11. The needle for the needle-stick-proof injection pen according to claim 1, characterized in that: The other end of the spring latch (103) is provided with a convex bump (1031), and the convex bump (1031) is interference-fitted with a side surface of the slide (404) to prevent the latch (4) from rotating in a free state.

12. The needle for the needle-stick-proof injection pen according to claim 1, characterized in that: The inner wall of the needle seat shield (5) is provided with a plurality of vertical ribs (501), and the outer wall of the needle seat (1) is provided with a plurality of needle seat vertical grooves (110). The positions of the needle seat vertical grooves (110) and the vertical ribs (501) are matched, so that when the needle seat shield (5) rotates, the needle seat (1) is driven to be screwed into the injection pen.

13. The needle for the needle-stick-proof injection pen according to claim 12, characterized in that: The outer wall of the card seat (4) is provided with a plurality of card seat vertical grooves (408), and the card seat vertical grooves (408) cooperate with the positions of the vertical ribs (501) to prevent the card seat (4) from rotating before use.

14. The needle for the needle-stick-proof injection pen according to claim 13, characterized in that: The vertical rib (501) comprises an upper vertical rib (502) and a lower vertical rib (503) formed integrally, the radial width of the upper vertical rib (502) being greater than the radial width of the lower vertical rib (503), and the shapes of the upper vertical rib (502) and the lower vertical rib (503) respectively matching the outer walls of the holder (4) and the needle holder (1).

15. The needle for the needle-stick-proof injection pen according to claim 14, characterized in that: The first seat body (101) comprises an upper seat body (1011) and a lower seat body (1012) formed in one piece. The outer diameter of the upper seat body (1011) is smaller than the outer diameter of the lower seat body (1012). The lower vertical rib (503) comprises a first lower vertical rib (5031) and a second lower vertical rib (5032) formed in one piece. The radial width of the first lower vertical rib (5031) is greater than the radial width of the second lower vertical rib (5032). The shapes of the first lower vertical rib (5031) and the second lower vertical rib (5032) respectively match the outer walls of the upper seat body (1011) and the lower seat body (1012).

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