Anti-puncture syringe needle and injection pen

Abstract

The present application provides an anti-puncture syringe needle and an injection pen. The anti-puncture syringe needle comprises a needle base, a fixed base, a sheath, and at least one ratchet. The needle base comprises a first base body located at a bottom end thereof, a second base body located at a top end thereof, and at least one supporting protrusion. A bottom end of the supporting protrusion is connected to the first base body and the supporting protrusion is arranged on an outer side of the second base body. The fixed base is connected to the needle base and located between the second base body and the supporting protrusion. The sheath is arranged on an outer side of the supporting protrusion and slidably connected to the needle base and / or the fixed base and can rotate by a certain angle relative to the fixed base. The ratchet is connected to the sheath and can prevent the sheath from rotating reversely. In a self-destruction process of the anti-puncture syringe needle, the sheath is pushed to an upper end of the supporting protrusion and rotates by a certain angle, so that the ratchet can be snap-fitted to the needle base and / or the fixed base so as to relatively fix the sheath and the needle base, thereby solving the technical problem of the failure of the automatic protection function on the syringe needle caused by the proneness of mistakenly touching a shell when removing a blood sampling needle.

Description

Sting-proof needle and injection pen TECHNICAL FIELD

[0001] The present application relates to the technical field of syringes, in particular to a sting-proof needle and an injection pen. BACKGROUND

[0002] An injection pen is a device for injecting a drug under the skin, and the injection pen includes a drug chamber, a tip connected to a needle, and a piston for injecting a dose, and the injection pen needs to use a disposable replaceable needle each time. These needles have different lengths to adapt to different depths of subcutaneous tissue.

[0003] The prior art discloses a patent with the application number 201610181993.6 and the name of a disposable safety self-destruction blood collection needle. The blood collection needle includes a shell, a needle storage bracket, a needle seat, a spring and a needle, the shell is provided with a clamping groove and a spring hole, the outlet of the spring hole is provided with a inclined groove, the needle storage bracket is provided with a buckle, a lifting claw, a limiting buckle, a sliding claw and a needle hole, the needle is fixedly connected with the needle seat in alignment with the needle hole, the needle seat is arranged on the lifting claw, the needle seat is connected with the spring, the clamping groove of the shell and the buckle of the needle storage bracket are connected with each other, and the limiting buckle is located between the lifting claw and the sliding claw to prevent the needle seat and the needle from being separated from the needle storage bracket, thereby facilitating mechanical automatic assembly.

[0004] However, the above-mentioned disposable safety self-destruction blood collection needle has certain safety hazards in use. After blood collection or injection is completed, the needle seat and the needle are retracted into the needle hole under the action of the spring force, thereby realizing the safety self-destruction function. Since the blood collection needle and the tip of the injection pen are connected through threads, the shell is easily touched by mistake when the blood collection needle is removed, so that the needle is stretched out of the needle hole, thereby causing the automatic protection function of the needle to fail. SUMMARY

[0005] The present application provides a sting-proof needle and an injection pen to solve the technical problem that the blood collection needle is easily touched by mistake when removed, thereby causing the automatic protection function of the needle to fail.

[0006] The present application provides a stab-proof needle, which comprises a needle seat, a fixing seat, a sheath and at least one ratchet, the needle seat comprises a first seat body at its bottom end, a second seat body at its top end and at least one supporting protrusion, the bottom end of the supporting protrusion is connected to the first seat body and is arranged outside the second seat body; the fixing seat is connected to the needle seat and is arranged between the second seat body and the supporting protrusion; the sheath is arranged outside the supporting protrusion and is slidably connected to the needle seat and / or the fixing seat and can be rotated by an angle relative to the fixing seat; the ratchet is connected to the sheath and can prevent the sheath from being reversely rotated; in the self-destruction process of the stab-proof needle, the sheath is pushed to the upper end of the supporting protrusion and is rotated by an angle, so that the ratchet can be engaged to the needle seat and / or the fixing seat to relatively fix the sheath to the needle seat.

[0007] Optionally, each supporting protrusion comprises a first protrusion part and a second protrusion part connected, and the height of the first protrusion part is lower than that of the second protrusion part; the supporting protrusion is an arc-shaped plate body, two or more supporting protrusions are arranged along the circumference of the second seat body, a limiting sliding channel is formed between two adjacent supporting protrusions, and the limiting sliding channel is arranged along the axial direction of the second seat body; the inner side wall of the sheath is provided with at least one limiting block, each limiting block is correspondingly engaged into the limiting sliding channel; in the self-destruction process of the stab-proof needle, the sheath is pushed along the limiting sliding channel to the position where the top surface of the first protrusion part is flush with the sheath, and the sheath can be rotated to the top surface of the first protrusion part.

[0008] Optionally, the inner side wall of the sheath is provided with the ratchet, a first engaging groove is formed between the inner side wall of the second protrusion part and the outer side wall of the fixing seat; when the sheath is rotated, the ratchet can slide along the outer side wall of the second protrusion part and is engaged into the first engaging groove.

[0009] Optionally, the second protrusion part is arranged to be inclined towards the sheath, and the inclination direction of the second protrusion part is opposite to the bending direction of the ratchet; the outer side wall of the second protrusion part is arranged to be inwardly inclined, and the inner side wall of the second protrusion part is arranged to be outwardly inclined, and along the direction close to the edge, the distance between the outer side wall and the inner side wall of the second protrusion part decreases.

[0010] Optionally, a groove is arranged at the joint between the second protrusion part and the first protrusion part, and the groove is arranged along the height direction of the second protrusion part; when the sheath moves along the limiting sliding channel, the ratchet slides in the groove; when the sheath is rotated, the ratchet is rotated out of the groove and slides along the outer side wall of the second protrusion part into the first engaging groove.

[0011] Optionally, a connecting arm is arranged between two adjacent limiting blocks, and the inner and outer sides of the connecting arm are respectively attached to the fixing seat and the supporting protrusion.

[0012] Optionally, the bottom of the sheath is provided with the ratchet, and the top surface of the first protruding part is correspondingly provided with a second clamping groove; when the sheath is rotated, the ratchet can be clamped into the second clamping groove along the top surface of the first protruding part.

[0013] Optionally, the top surface edge of the first protruding part comprises a first inclined surface, which is arranged to be inclined towards the direction of the second protruding part and the sheath, and the top surface of the first protruding part and the second clamping groove form a protruding end; the bottom end of the limiting block close to the second protruding part comprises a second inclined surface, which is arranged to be inclined towards the direction of the first protruding part and is adapted to the inclination angle of the first inclined surface; the bottom end of the limiting block is provided with an opening; during the rotation of the sheath, the second inclined surface slides over the first inclined surface and moves to the joint of the first protruding part and the second protruding part, so that the ratchet is clamped into the second clamping groove, and at the same time, the protruding end is clamped into the opening.

[0014] Optionally, the side wall of the limiting block is provided with the ratchet, the outer side wall of the fixing seat is correspondingly provided with a limiting tooth, and the limiting tooth and the outer side wall of the fixing seat form a third clamping groove; the inclination direction of the limiting tooth is opposite to the bending direction of the ratchet; when the sheath is rotated, the ratchet can slide over the outer wall of the limiting tooth and be clamped into the third clamping groove.

[0015] Optionally, the ratchet is arc-shaped, the concave surface of the ratchet is arranged towards the outer side of the limiting block and is provided with a first positioning groove along the height direction thereof; the edge of the second protruding part is provided with a second positioning groove along the height direction thereof; when the sheath moves along the limiting slide, the edge of the second protruding part is clamped into the first positioning groove and slides, and at the same time, the edge of the limiting block is clamped into the second positioning groove and slides.

[0016] Optionally, the end of the limiting block towards the fixing seat is recessed and provided with an opening; when the sheath moves along the limiting slide, the limiting tooth is clamped into the opening.

[0017] Optionally, the outer side wall of the sheath is provided with at least one avoiding channel along the axial direction thereof, each of the supporting protrusions is capable of being clamped into one of the avoiding channels; the bottom end of the ratchet is connected to the lower end of the avoiding channel, the top end of the ratchet is provided in an inclined manner away from the second protruding part, so that the top end of the ratchet and the side wall of the avoiding channel form a fourth clamping groove; the first protruding part is provided with a vertical groove along the height direction, the ratchet is capable of being correspondingly clamped into the vertical groove and sliding; when the sheath is rotated, the ratchet is capable of sliding out of the vertical groove and abutting to the edge of the second protruding part, while the top end of the second protruding part is capable of being clamped into the fourth clamping groove.

[0018] Optionally, the ratchet is provided at the middle of the lower end of the avoiding channel, so that the distance between the side walls of the avoiding channel and the two ends of the ratchet is the same; the bottom of the sheath is recessed with a blind groove, the blind groove is staggered with the avoiding channel.

[0019] Optionally, the anti-puncture needle further comprises a needle, the needle is provided into the needle seat and is glued and fixed to the top end of the first protruding part; wherein the gluing point between the needle and the first protruding part is lower than the upper surface of the fixing seat.

[0020] Optionally, the side wall of the first protruding part is provided with a first guide inclined angle; the end of the top surface of the first protruding part is provided with a second guide inclined angle.

[0021] Optionally, the end of the limiting block towards the fixing seat is recessed with an opening, the limiting block located in the opening is provided with a limiting strip, the limiting strip is made of elastic material; the outer side wall of the upper end of the fixing seat is correspondingly provided with a limiting groove along the circumferential direction; during the movement of the sheath along the needle seat, the limiting strip is pressed and abuts to the outer side wall of the fixing seat; when the sheath is pushed to the upper end of the supporting protrusion, the limiting strip is clamped into the limiting groove.

[0022] Optionally, the bottom of the second seat body is provided with an annular groove, the inner side wall of the bottom end of the fixing seat is provided with an annular clamping hook, the fixing seat is interference-fitted with the second seat body, and the annular clamping hook is capable of being clamped into the annular groove, so that the fixing seat is fixed with the needle seat.

[0023] Optionally, the upper edge of the fixing seat is provided with an annular flange, the inner side wall of the lower end of the sheath is provided with an annular surrounding edge, when the sheath is pushed to the upper end of the supporting protrusion, the annular flange abuts to the upper side of the annular surrounding edge.

[0024] Optionally, the outer side wall of the bottom end of the needle seat is provided with an anti-skid pattern; the outer side wall of the sheath is provided with an anti-skid groove.

[0025] Correspondingly, the application also provides an injection pen, which comprises an injection tube and a safety needle, the safety needle is detachably connected to the injection tube, and the safety needle is any one of the safety needles described above.

[0026] The application provides a safety needle and an injection pen, the safety needle can be shielded by a sheath after one use, and the sheath and the needle seat are locked by the clamping force between the ratchet and the supporting protrusion, so that the safety needle cannot be reused, and the doctor and the patient are also prevented from being hurt in subsequent processing.

[0027] At present, the safety needle and the injection tube are detachably connected through threaded cooperation, and the patient removes the safety needle from the tip of the injection tube by rotating after injection, so that the patient can realize self-destruction of the safety needle by manually pushing and rotating the sheath, the safety needle can be self-destructed when it is removed, and the stability and reliability of the self-destruction structure of the safety needle are improved.

[0028] Meanwhile, compared with the structure in the prior art, the number of product accessories of the safety needle in the application is small, and the assembly is simple, so that the assembly efficiency and the yield of the safety needle can be improved, the manufacturing cost of the safety needle is reduced, and the economic benefit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Fig. 1 is a structural schematic diagram of a safety needle in embodiment one provided by the application;

[0031] Fig. 2 is a partial structural schematic diagram of the safety needle in embodiment one provided by the application;

[0032] Fig. 3 is a cross-sectional view one of the safety needle in embodiment one provided by the application;

[0033] Fig. 4 is an exploded schematic diagram of the safety needle in embodiment one provided by the application;

[0034] Fig. 5 is a cross-sectional view two of the safety needle in embodiment one provided by the application;

[0035] Fig. 6 is a structural schematic diagram of a needle seat and a fixing seat in the safety needle in embodiment one provided by the application;

[0036] Fig. 7 is a structural schematic diagram of the needle seat in the safety needle in embodiment one provided by the application;

[0037] Figure 8 is a structural schematic diagram of a fixed seat in a safety needle according to an embodiment of the present application;

[0038] Figure 9 is a structural schematic diagram of a sheath in a safety needle according to an embodiment of the present application;

[0039] Figure 10 is a sectional view of a safety needle according to another embodiment of the present application;

[0040] Figure 11 is a structural schematic diagram of a needle seat in a safety needle according to the embodiment of the present application;

[0041] Figure 12 is a structural schematic diagram of a safety needle according to another embodiment of the present application;

[0042] Figure 13 is an exploded schematic diagram of a safety needle according to the embodiment of the present application;

[0043] Figure 14 is a structural schematic diagram of a needle seat in a safety needle according to the embodiment of the present application;

[0044] Figure 15 is a structural schematic diagram of a safety needle according to another embodiment of the present application;

[0045] Figure 16 is a structural schematic diagram of a needle seat and a fixed seat in a safety needle according to the embodiment of the present application;

[0046] Figure 17 is a structural schematic diagram of a sheath in a safety needle according to the embodiment of the present application;

[0047] Figure 18 is a structural schematic diagram of a safety needle according to another embodiment of the present application;

[0048] Figure 19 is a structural schematic diagram of a sheath in a safety needle according to the embodiment of the present application;

[0049] Figure 20 is a structural schematic diagram of a needle seat in a safety needle according to the embodiment of the present application;

[0050] Explanation of reference signs: 100, needle seat; 110, first seat body; 111, anti-skid pattern; 120, second seat body; 121, annular groove; 200, supporting protrusion; 210, first protruding part; 211, first guide bevel; 212, second guide bevel; 213, second clamping groove; 214, protruding end; 215, first bevel; 216, vertical groove; 220, second protruding part; 221, groove; 223, second positioning groove; 230, limiting slide; 300, fixing seat; 310, annular clamping hook; 320, annular flange; 330, limiting tooth; 340, limiting groove; 400, sheath; 410, ratchet; 411, first positioning groove; 420, limiting block; 421, opening; 422, limiting strip; 423, second bevel; 430, annular surrounding edge; 440, anti-skid groove; 450, avoiding passage; 451, fourth clamping groove; 470, connecting arm; 500, needle; 700, needle cap. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments 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, the orientation words such as "upper", "lower", "left", "right" generally refer to the upper, lower, left and right of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings.

[0052] The present application provides a stab-proof needle and an injection pen, which will be described in detail below. It should be noted that the description order of the following embodiments is not limited as the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0053] Embodiment one

[0054] Referring to FIG. 1, the present application provides an injection pen, which can be applied to subcutaneous drug injection, such as insulin and other injectable drugs. The injection pen comprises an injection tube and a stab-proof needle, which is detachably fixed to the tip of the injection tube. In the present application, the stab-proof needle is threadedly connected with the tip of the injection tube.

[0055] Referring to FIGS. 1-9, the stab-proof needle comprises a needle cap 700, a needle seat 100, a fixing seat 300, a sheath 400 and at least one ratchet 410.

[0056] The needle seat 100 is a hollow columnar structure, the needle seat 100 comprises a first seat body 110 at the end thereof, a second seat body 120 at the top end thereof, and at least one supporting protrusion 200, the second seat body 120 and the supporting protrusion 200 are arranged on the upper end surface of the first seat body 110, and in the present application, the first seat body 110, the second seat body 120 and the supporting protrusion 200 are integrally formed by injection molding process.

[0057] The second seat body 120 is arranged at the center of the first seat body 110, and the inside of the second seat body 120 is in communication with the inside of the first seat body 110, and in the present application, the radial dimension of the first seat body 110 is greater than the radial dimension of the second seat body 120. A needle 500 for injection is arranged in the inside of the needle seat 100, the needle 500 is arranged in the inside of the second seat body 120 through the first seat body 110, and is fixedly connected to the top end of the second seat body 120 by glue, so that the needle 500 is relatively fixed with the needle seat 100.

[0058] Please refer to FIG. 1-9, the supporting protrusion 200 is arranged on the outside of the second seat body 120, and in the present application, the supporting protrusion 200 is provided with 2-4 groups, which are respectively arranged around the second seat body 120. The supporting protrusion 200 is an arc-shaped plate body, and a certain distance is left between the inner side wall of the supporting protrusion 200 and the outer side wall of the second seat body 120. A limiting sliding channel 230 can be formed between two adjacent supporting protrusions 200, and the limiting sliding channel 230 is arranged in the axial direction of the second seat body 120.

[0059] Please refer to FIG. 1-9, each supporting protrusion 200 comprises a first protrusion part 210 and a second protrusion part 220 connected on the side, and the axial height of the first protrusion part 210 is lower than the axial height of the second protrusion part 220. The upper end of the side wall of the first protrusion part 210 is provided with a first guide inclined angle 211, and the end of the top end of the second protrusion part 220 is provided with a second guide inclined angle 212.

[0060] Please refer to FIG. 1-9, the fixing seat 300 is fixedly connected to the needle seat 100 and is arranged between the second seat body 120 and the supporting protrusion 200. The bottom of the second seat body 120 is provided with an annular groove 121, and the inner side wall of the bottom end of the fixing seat 300 is provided with an annular clamping hook 310. The fixing seat 300 is sleeved to the outer side wall of the second seat body 120, and the fixing seat 300 and the second seat body 120 are in interference fit, so that the fixing seat 300 and the second seat body 120 can be relatively fixed.

[0061] When the fixed seat 300 is fixed relative to the second seat body 120, the annular clamping hook 310 can be clamped into the annular groove 121, so as to limit the relative position of the fixed seat 300 and the second seat body 120, and ensure the position accuracy when the fixed seat 300 and the second seat body 120 are assembled.

[0062] Please refer to FIGS. 1-9, the sheath 400 is a hollow cylindrical structure, and is arranged outside all the support protrusions 200 and is slidably connected to the needle seat 100 and / or the fixed seat 300. The upper edge of the fixed seat 300 is provided with an annular flange 320, and the inner side wall of the lower end of the sheath 400 is provided with an annular rim 430. When the sheath 400 is pushed to the upper end of the support protrusion 200, the annular flange 320 can abut against the upper side of the annular rim 430, so as to limit the limit position of the upward sliding of the sheath 400, and avoid the disconnection of the sheath 400 and the fixed seat 300.

[0063] When the sheath 400 is located above the first seat body 110 (or the bottom end of the second seat body 120), the needle 500 can be extended from the inside of the sheath 400, and at this time, the injection pen is in an injection state; when the sheath 400 is located at the upper end of the second seat body 120 (or the fixed seat 300), the sheath 400 covers the outside of the needle 500, and at this time, the injection pen is in an initial state or a self-destruction state.

[0064] The sheath 400 can be rotated by an angle relative to the fixed seat 300. When the sheath 400 is located at the upper end of the second seat body 120 (or the fixed seat 300) and the sheath 400 is not rotated, at this time, the injection pen is in an initial state. When the sheath 400 is located at the upper end of the second seat body 120 (or the fixed seat 300) and the sheath 400 is rotated by an angle, at this time, the injection pen is in a self-destruction state.

[0065] Please refer to FIGS. 1-9, the sheath 400 is provided with at least one ratchet 410. When the sheath 400 is rotated by an angle, the ratchet 410 can reverse the sheath 400 in the opposite direction, so that the sheath 400 and the needle seat 100 remain in a relatively fixed state. The setting position of the ratchet 410 in the application has multiple schemes, and the subsequent listed schemes are only examples. The protection scope of the application should not be limited to the following listed schemes, and similar related design schemes should also be within the protection scope of the application.

[0066] Please refer to FIGS. 1-9, the inner side wall of the sheath 400 is provided with at least one limiting block 420. The limiting block 420 corresponds to the limiting slide 230 one by one, so that each limiting block 420 can be correspondingly clamped into one limiting slide 230 for linear motion. The limiting slide 230 can limit the accuracy of the axial movement of the sheath 400, and ensure the safety and stability of the safety needle in use.

[0067] Please refer to FIG. 1-9, the end of the limiting block 420 is concave formed with an opening 421, the opening 421 is formed by the top wall of the limiting block 420 to the bottom wall, so that the limiting block 420 forms a U-shaped structure. At the same time, the end of the limiting block 420 can be abutted to the outer side wall of the fixed seat 300, so as to increase the stability when the push-pull sheath 400 is pushed and pulled.

[0068] Please refer to FIG. 1-9, the inner side wall of the sheath 400 is provided with a limiting strip 422, the limiting strip 422 is made of elastic material, so that the elastic strip has a certain elastic deformation performance. The outer side wall of the upper end of the fixed seat 300 is correspondingly provided with a limiting groove 340 along the axial direction, so that the limiting strip 422 can be clamped into the limiting groove 340. The limiting strip 422 can be an arc segment structure or a complete ring structure, and the limiting strip 422 in this application is an arc segment and is arranged in the opening 421 of the limiting block 420.

[0069] During the movement of the sheath 400 along the axial direction of the needle seat 100, the end of the limiting strip 422 is abutted to the outer side wall of the fixed seat 300, and the limiting strip 422 is in a state of being extruded and deformed, which can eliminate the side tolerance between the sheath 400 and the fixed seat 300, avoid shaking and swinging of the sheath 400 during movement, and improve the stability of the sheath 400 during sliding, thereby improving the use experience of the injection pen.

[0070] When the sheath 400 is located at the upper end of the supporting protrusion 200, the limiting strip 422 is clamped into the limiting groove 340, and the limiting strip 422 is in an undeformed state. Since the limiting strip 422 is in a deformed state during sliding and is in an undeformed state in the limiting groove 340, when the sheath 400 is moved to a preset position during manual pushing and pulling of the sheath 400, the limiting strip 422 is just moved into the limiting groove 340, so that the sheath 400 has a clear in-place prompt feeling, thereby facilitating the operation and use of the patient.

[0071] When the injection pen is in an initial state, since the limiting strip 422 is clamped into the limiting groove 340, it can be ensured that the needle guard cannot easily slide axially due to external force, thereby improving the stability and safety of the needle guard in the initial state. At the same time, during the rotation of the sheath 400, the limiting strip 422 can be rotated synchronously in the limiting groove 340, thereby improving the accuracy of the rotation of the sheath 400.

[0072] Since the limiting strip 422 does not deform when it is clamped into the limiting groove 340, the limiting strip 422 can always maintain good elastic performance when the injection pen is in an initial state, thereby improving the use experience and use accuracy of the injection pen.

[0073] Please refer to FIG. 1-9, the inner side wall of the sheath 400 is provided with the above-mentioned ratchet 410, the number of the ratchet 410 is preferably 2-4, the number of the above-mentioned ratchet 410 is only an example, and does not limit the protection scope of the present application.

[0074] The second protruding part 220 is arranged obliquely towards the direction of the sheath 400, and the oblique direction of the second protruding part 220 is opposite to the bending direction of the ratchet 410. The inner side wall of the second protruding part 220 and the outer side wall of the fixed seat 300 form a first clamping groove, so that the ratchet 410 can be clamped into the first clamping groove, thereby preventing the sheath 400 from rotating reversely.

[0075] Please refer to FIG. 1-9, the outer side wall of the second protruding part 220 is arranged obliquely inward, and the inner side wall of the second protruding part 220 is arranged obliquely outward, so that the distance between the outer side wall and the inner side wall of the second protruding part 220 gradually decreases from the middle part to the edge direction, so that the edge of the second protruding part 220 is arranged as a sharp end. When the sheath 400 is rotated, the ratchet 410 can slide through the outer side wall of the second protruding part 220 and be clamped into the first clamping groove.

[0076] Since the oblique direction of the second protruding part 220 is opposite to the bending direction of the ratchet 410, the clamping force between the second protruding part 220 and the ratchet 410 can be used to limit the reverse movement of the sheath 400, and the ratchet 410 needs to slide through the outer side wall of the second protruding part 220 during rotating into the first clamping groove, so that the ratchet 410 applies a pushing force to the second protruding part 220, causing the second protruding part 220 to slightly elastically deform. Therefore, the force applied by the user when rotating the sheath 400 needs to be greater than the frictional force between the ratchet 410 and the second protruding part 220, so that the sheath 400 can be prevented from being randomly rotated under external action, thereby ensuring the accuracy and safety of the injection pen.

[0077] Please refer to FIG. 1-9, in the initial state, the sheath 400 is located at the upper end of the fixed seat 300, and the limiting block 420 is located at the top of the limiting slide 230. The patient presses the anti-stab needle head against the surface of the injection skin, and presses downward so that the sheath 400 gradually approaches the first seat body 110 in the axial direction under the action of the pressure, and the limiting block 420 moves synchronously in the limiting slide 230, until the bottom end of the sheath 400 abuts against the top surface of the first seat body 110, at this time the needle head 500 is completely inserted into the skin of the patient, and the patient pushes the piston of the injection tube body to inject the injectable liquid into the body.

[0078] After the injection is completed, the needle 500 is pulled out of the skin, the patient pulls the sheath 400 to gradually move to the top end of the fixed seat 300, so that the limiting block 420 moves synchronously in the limiting slide 230, until the annular flange 320 of the fixed seat 300 abuts to the annular surrounding edge 430 of the sheath 400, at this time the limiting block 420 moves to the top end of the limiting slide 230, so that the needle 500 extends into the inside of the sheath 400. The patient rotates the sheath 400, so that the bottom end of the sheath 400 gradually moves to the top surface of the first protruding portion 210, and at the same time the sheath 400 can drive the ratchet 410 to gradually slide through the outer side wall of the second protruding portion 220; when the ratchet 410 slides through the second protruding portion 220 and is clamped into the first clamping groove, the sheath 400 is relatively fixed with the fixed seat 300 and the needle holder 100, so that the safety needle is in a self-destruction state.

[0079] In the present application, when the ratchet 410 slides through the second protruding portion 220, the sheath 400 is continuously rotated, so that the side wall of the limiting block 420 can abut to the top end of the second protruding portion 220, so that the sheath 400 can apply a rotating force to the seat body through the second protruding portion 220. Since the needle holder 100 is connected to the injection pipe body by a threaded connection, the needle holder 100 can be synchronously driven to rotate during the rotation of the sheath 400, so as to be detached from the injection pipe body.

[0080] The safety needle can shield the needle 500 by the sheath 400 after being used once, and lock the sheath 400 with the needle holder 100 by the clamping force between the ratchet 410 and the second protruding portion 220, so as to avoid the safety needle from being reused, and also avoid causing harm to doctors and patients in subsequent processing.

[0081] At present, the safety needle and the injection pipe body are detachably connected by a threaded cooperation, and after the injection is completed, the patient usually rotates to detach the safety needle from the tip of the injection pipe body, so that the patient can realize self-destruction of the safety needle by manually pushing and pulling and rotating the sheath 400, so as to realize self-destruction of the safety needle while the safety needle is detached, and increase the stability and reliability of the self-destruction structure of the safety needle.

[0082] Meanwhile, compared with the structure in the prior art, the number of product accessories of the safety needle in the present application is small, and the assembly is simple, so as to increase the assembly efficiency and yield of the safety needle, reduce the manufacturing cost of the safety needle, and improve the economic benefit.

[0083] During the self-destruction of the safety needle, the top surface and the side wall of the first protruding portion 210 are respectively provided with the second guide inclined angle 212 and the first guide inclined angle 211, so that the edge of the first protruding portion 210 has a certain guiding tolerance, so that the sheath 400 moves more smoothly along the limiting slide 230 and the top surface of the first protruding portion 210.

[0084] Please refer to FIG. 1-9, the glue joint position of the needle 500 and the second seat body 120 is lower than the upper surface of the fixed seat 300, thus avoiding the stimulation of the protruding glue to the skin of the contact area, greatly reducing the pain of the patient, further improving the touch of the skin during injection, and improving the use experience of the safety needle.

[0085] Please refer to FIG. 1-9, the outer side wall of the bottom end of the needle seat 100 is provided with a plurality of anti-skid lines 111, so as to increase the friction between the patient's hand and the needle seat 100, so as to facilitate the removal of the needle seat 100 from the tip of the injection tube body.

[0086] The outer side wall of the sheath 400 is provided with at least one anti-skid groove 440, and the upper end and the lower end of the sheath 400 are provided with the anti-skid groove 440, so as to increase the friction between the sheath 400 and the patient's fingers, so as to facilitate the pushing and pulling and rotating of the sheath 400.

[0087] Please refer to FIG. 1-9, the junction of the first protruding part 210 and the second protruding part 220 is provided with a groove 221, which is opened along the height direction of the second protruding part 220. When the sheath 400 moves along the limiting slide 230, the ratchet 410 can slide in the groove 221, so as to further improve the accuracy of pushing and pulling the sheath 400.

[0088] When the sheath 400 is rotated to the top surface of the first protruding part 210, the ratchet 410 can be rotated out of the groove 221 and slide along the outer side wall of the second protruding part 220 to the first clamping groove. The ratchet 410 is clamped in the groove 221, so that the sheath 400 can be rotated under a smaller preset external force, and the free rotation of the ratchet 410 under transportation or other natural conditions can be avoided, so as to improve the safety and stability of the safety needle in use.

[0089] Embodiment two

[0090] Please refer to FIG. 1-11, the application provides an injection pen, which comprises an injection tube body and a safety needle, the safety needle is detachably fixed to the tip of the injection tube body, and the safety needle comprises a needle cap 700, a needle seat 100, a fixed seat 300, a sheath 400 and at least one ratchet 410.

[0091] The difference between the embodiment and the embodiment one is that the structure of the sheath 400 is different, which is as follows:

[0092] The two adjacent limiting blocks 420 are provided with a connecting arm 470, the inner side of the connecting arm 470 is attached to the fixed seat 300, and the outer side is attached to the supporting protrusion 200. In this embodiment, the contact area between the sheath 400 and the fixed seat 300 is increased, so that the sheath 400 is more stable during the push-pull process and is not easy to swing.

[0093] The other structures and functions of the injection pen provided in this embodiment correspond to the structures and functions realized in Embodiment One, so for other functions of this embodiment, please refer to the content in Embodiment One, which will not be repeated here.

[0094] Embodiment Three

[0095] Please refer to FIGS. 1-14, the present application provides an injection pen, which comprises an injection tube body and a safety needle head, the safety needle head is detachably fixed to the tip of the injection tube body, the safety needle head comprises a needle cap 700, a needle seat 100, a fixed seat 300, a sheath 400 and at least one ratchet 410.

[0096] The difference between this embodiment and Embodiment One is that the structure of the sheath 400 and the supporting protrusion 200 is different, which is as follows:

[0097] Please refer to FIGS. 1-14, the bottom of the sheath 400 is provided with at least one ratchet 410, and a plurality of ratchets 410 can be distributed equidistantly along the circumference of the sheath 400. The top surface of the first protrusion 210 is correspondingly provided with a second clamping groove 213, and the top surface of the first protrusion 210 is provided with a first inclined surface 215, which is inclined towards the direction of the second protrusion 220 and the sheath 400, and the junction of the top surface of the first protrusion 210 and the second clamping groove 213 forms a protruding end 214.

[0098] The limiting block 420 close to the bottom end of the second protrusion 220 comprises a second inclined surface 423, which is inclined towards the direction of the first protrusion 210, and the inclination angle of the first inclined surface 215 and the inclination angle of the second inclined surface 423 are matched.

[0099] Please refer to FIGS. 1-14, in the initial state, the sheath 400 is located at the upper end of the fixed seat 300, and the limiting block 420 is located at the top of the limiting slide 230. The patient holds the safety needle head against the surface of the injection skin, and presses downward so that the sheath 400 gradually approaches the first seat body 110 under the action of pressure, at the same time, the limiting block 420 moves synchronously in the limiting slide 230, until the bottom end of the sheath 400 abuts to the top surface of the first seat body 110, at this time, the needle head 500 is completely inserted into the skin of the patient, and the patient pushes the piston of the injection tube body to inject the injectable liquid into the body.

[0100] After the injection is completed, the needle 500 is pulled out of the skin, the patient pulls the sheath 400 to gradually move to the top end of the fixed seat 300, so that the limiting block 420 moves synchronously in the limiting slide 230, until the annular flange 320 of the fixed seat 300 abuts to the annular surrounding edge 430 of the sheath 400, at this time the limiting block 420 moves to the top end of the limiting slide 230, so that the needle 500 extends into the inside of the sheath 400. The patient rotates the sheath 400, so that the bottom end of the sheath 400 gradually moves to the top surface of the first protruding portion 210, at the same time the sheath 400 can drive the ratchet 410 to move synchronously with the limiting block 420, so that the second inclined surface 423 of the limiting block 420 can slide through the first inclined surface 215 and gradually move to the junction of the first protruding portion 210 and the second protruding portion 220; At this time, the ratchet 410 is clamped into the inside of the second clamping groove 213, and the protruding end 214 is clamped into the opening 421 of the limiting block 420, so as to relatively fix the sheath 400 with the fixed seat 300 and the needle holder 100, so that the anti-stab needle is in a self-destruction state.

[0101] The other structures and functions of the injection pen provided in the embodiment correspond to the structures and functions realized in the first embodiment, so the other functions of the embodiment can be referred to the content in the first embodiment, which will not be repeated here.

[0102] Embodiment four

[0103] Please refer to FIG. 1-FIG. 17, the application provides an injection pen, which comprises an injection tube body and an anti-stab needle, the anti-stab needle is detachably fixed to the tip of the injection tube body, and the anti-stab needle comprises a needle cap 700, a needle holder 100, a fixed seat 300, a sheath 400 and at least one ratchet 410.

[0104] The difference between the embodiment and the first embodiment is that the structure of the sheath 400 and the supporting protrusion 200 is different, which is as follows:

[0105] Please refer to FIG. 1-FIG. 17, the side wall of the limiting block 420 is provided with the above-mentioned ratchet 410, and the outer side wall of the fixed seat 300 is correspondingly provided with a limiting tooth 330, which can form a third clamping groove with the outer side wall of the fixed seat 300. The inclined direction of the limiting tooth 330 is opposite to the bending direction of the ratchet 410, so that the reverse rotation of the sheath 400 can be limited by the clamping effect of the limiting tooth 330 and the ratchet 410.

[0106] Please refer to FIG. 1-FIG. 17, the ratchet 410 is an arc-shaped structure, and the concave surface of the ratchet 410 is arranged towards the outer side of the limiting block 420. When the patient rotates the sheath 400, the arc-shaped ratchet 410 can slide through the outer wall of the limiting tooth 330 and be clamped into the third clamping groove, so that the sheath 400 and the needle holder 100 are relatively fixed, and the self-destruction of the anti-stab needle is realized.

[0107] Referring to FIG. 1-17, in the initial state, the sheath 400 is located at the upper end of the fixed seat 300, and the limiting block 420 is located at the top of the limiting slide 230. The patient will attach the puncture-proof needle head to the surface of the injection skin, and press downward so that the sheath 400 gradually approaches the first seat body 110 in the axial direction under the action of the pressure, while the limiting block 420 moves synchronously in the limiting slide 230, until the bottom end of the sheath 400 abuts to the top surface of the first seat body 110, at this time the needle head 500 is completely inserted into the patient's skin, and the patient pushes the piston of the injection tube body to inject the injectable liquid into the body.

[0108] After the injection is completed, the needle head 500 is pulled out of the skin, and the patient pulls the sheath 400 to gradually move to the top end of the fixed seat 300, so that the limiting block 420 moves synchronously in the limiting slide 230, until the annular flange 320 of the fixed seat 300 abuts to the annular surrounding edge 430 of the sheath 400, at this time the limiting block 420 moves to the top end of the limiting slide 230, so that the needle head 500 extends into the inside of the sheath 400. The patient rotates the sheath 400, so that the bottom end of the sheath 400 gradually moves to the top surface of the first protruding portion 210, while the sheath 400 can drive the limiting block 420 to move synchronously, so that the ratchet teeth 410 can slide over the outer wall of the limiting teeth 330 and be clamped into the inside of the third clamping groove, thereby relatively fixing the sheath 400 with the fixed seat 300 and the needle holder 100, so that the puncture-proof needle head is in a self-destruction state.

[0109] Referring to FIG. 1-17, the concave surface of the ratchet teeth 410 is provided with a first positioning groove 411 along the height direction thereof, while the edge of the second protruding portion 220 is provided with a second positioning groove 223 along the height direction thereof. When the sheath 400 moves in the direction of the limiting slide 230, the edge of the second protruding portion 220 can be clamped into the first positioning groove 411 to slide, while the edge of the limiting block 420 is clamped into the second positioning groove 223 to slide.

[0110] The clamping force between the second protruding portion 220 and the first positioning groove 411, and the clamping force between the limiting block 420 and the second positioning groove 223 can further improve the accuracy when the sheath 400 is pushed and pulled.

[0111] When the sheath 400 is rotated to the top surface of the first protruding portion 210, the second protruding portion 220 is separated from the first positioning groove 411, and the limiting block 420 is separated from the second positioning groove 223, so that the sheath 400 can be rotated under a smaller predetermined external force, which can avoid the free rotation of the ratchet teeth 410 in the transportation or other natural state, and improve the safety and stability of the puncture-proof needle head in use.

[0112] Please refer to FIG. 1-17, when the sheath 400 moves along the limiting slide 230, the limiting teeth 330 can be clamped into the opening 421, thereby further improving the accuracy when pushing and pulling the sheath 400.

[0113] The other structure and function of the injection pen provided by the embodiment correspond to the structure and function realized in the first embodiment, so the other functions of the embodiment can be referred to the content in the first embodiment, which will not be repeated here.

[0114] Embodiment five

[0115] Please refer to FIG. 1-20, the application provides an injection pen, which comprises an injection tube and a safety needle, the safety needle is detachably fixed to the tip of the injection tube, the safety needle comprises a needle cap 700, a needle seat 100, a fixed seat 300, a sheath 400 and at least one ratchet tooth 410.

[0116] The difference between the embodiment and the first embodiment is that the structure of the sheath 400 and the supporting protrusion 200 is different, which is as follows:

[0117] Please refer to FIG. 1-20, the outer side wall of the sheath 400 is provided with at least one avoiding channel 450 along the axial direction, the avoiding channel 450 corresponds to the supporting protrusion 200, so that each supporting protrusion 200 can be clamped into an avoiding channel 450. The bottom end of the ratchet tooth 410 is connected to the lower end of the avoiding channel 450, and the top end of the ratchet tooth 410 is inclinedly arranged away from the second protrusion 220, so that the top end of the ratchet tooth 410 and the side wall of the avoiding channel 450 form a fourth clamping groove 451.

[0118] The first protrusion 210 is provided with a vertical groove 216 along the height direction, the ratchet tooth 410 can be correspondingly clamped into the vertical groove 216 and slide; when the patient rotates the sheath 400, the ratchet tooth 410 can slide out of the vertical groove 216 and abut against the edge of the second protrusion 220, and the top end of the second protrusion 220 can be clamped into the fourth clamping groove 451, so that the clamping force between the ratchet tooth 410 and the second protrusion 220 and the clamping force between the second protrusion 220 and the fourth clamping groove 451 can jointly limit the reverse rotation of the sheath 400.

[0119] Please refer to FIG. 1-20, in the initial state, the sheath 400 is located at the upper end of the fixed seat 300, and the limiting block 420 is located at the top of the limiting slide 230. The patient will attach the needle head to the surface of the injection skin, and press down so that the sheath 400 gradually approaches the first seat body 110 under the action of the pressure, while the limiting block 420 moves synchronously in the limiting slide 230, until the bottom end of the sheath 400 abuts to the top surface of the first seat body 110, at this time the needle head 500 is completely inserted into the patient's skin, and the patient pushes the piston of the injection tube to inject the injectable liquid into the body.

[0120] After the injection is completed, the needle head 500 is pulled out of the skin, and the patient pulls the sheath 400 to gradually move to the top end of the fixed seat 300, so that the limiting block 420 moves synchronously in the limiting slide 230, until the annular flange 320 of the fixed seat 300 abuts to the annular surrounding edge 430 of the sheath 400, at this time the limiting block 420 moves to the top end of the limiting slide 230, so that the needle head 500 extends into the inside of the sheath 400. The patient rotates the sheath 400, so that the bottom end of the sheath 400 gradually moves to the top surface of the first protruding part 210, while the sheath 400 can drive the ratchet 410 to move synchronously, so that the ratchet 410 can slide out of the vertical groove 216 and abut to the edge of the second protruding part 220, thereby fixing the sheath 400 relative to the fixed seat 300 and the needle holder 100, so that the needle head is in a self-destruction state.

[0121] Please refer to FIG. 1-20, the ratchet 410 is arranged at the middle of the lower end of the avoiding passage 450, so that the distance between the two side walls of the avoiding passage 450 and the two ends of the ratchet 410 is the same, thereby avoiding the interference between the supporting protrusion 200 and the sheath 400 when rotating.

[0122] Please refer to FIG. 1, the bottom of the sheath 400 is recessed and provided with a blind groove, the blind groove is staggered with the avoiding passage 450, so that the elastic deformation performance of the sheath 400 is increased.

[0123] The other structures and functions of the injection pen provided by the embodiment correspond to the structures and functions realized in the first embodiment, so the other functions of the embodiment can be referred to the content in the first embodiment, which will not be repeated here.

[0124] The above provides a kind of needle head and injection pen of anti-piercing, detailed introduction is carried out to the application in this paper, the principle and implementation mode of the application are described in specific example in this paper, the above embodiment is only for helping to understand the method and its core idea of the application;Meanwhile, for the person skilled in the art, according to the idea of the application, in specific implementation mode and application range will have change, the above-mentioned, the content of the specification should not be understood as the limitation of the application.

Claims

1. A puncture-proof needle, characterized in that: include: A needle hub, comprising a first base at its bottom end, a second base at its top end, and at least one supporting protrusion, wherein the bottom end of the supporting protrusion is connected to the first base and is disposed on the outside of the second base; a fixing seat connected to the needle seat and located between the second seat body and the supporting protrusion; a sheath, the sheath being arranged on the outer side of the supporting protrusion and being slidably connected to the needle seat and / or the fixing seat, and being capable of rotating at an angle relative to the fixing seat; as well as at least one ratchet connected to the sheath and capable of preventing reverse rotation of the sheath; In the process of self-destruction of the puncture-proof needle, the sheath is pushed to the upper end of the supporting protrusion and rotated at an angle so that the ratchet can engage with the needle seat and / or the fixing seat to fix the sheath relative to the needle seat.

2. The puncture-proof needle according to claim 1, characterized in that: Each of the supporting protrusions includes a first protrusion portion and a second protrusion portion connected to each other, and the height of the first protrusion portion is lower than the height of the second protrusion portion; The supporting protrusion is an arc-shaped plate body, two or more supporting protrusions are arranged along the circumference of the second seat body, a limiting slide is formed between two adjacent supporting protrusions, and the limiting slide is arranged along the axial direction of the second seat body; At least one limiting block is provided on the inner side wall of the sheath, and each limiting block is correspondingly engaged in one of the limiting slideways; During the self-destruction of the puncture-proof needle, the sheath is pushed along the limiting slideway to be flush with the top surface of the first protrusion, and can be rotated to the top surface of the first protrusion.

3. The puncture-proof needle according to claim 2, characterized in that: The ratchet is provided on the inner side wall of the sheath, and a first slot is formed between the inner side wall of the second protrusion and the outer side wall of the fixing seat; When the sheath is rotated, the ratchet can slide over the outer side wall of the second protrusion and be engaged in the first engaging groove.

4. The puncture-proof needle according to claim 3, characterized in that: The second protrusion is arranged to be inclined toward the sheath, and the inclination direction of the second protrusion is opposite to the bending direction of the ratchet; The outer side wall of the second protrusion is tilted inward, and the inner side wall of the second protrusion is tilted outward. In a direction approaching the edge, the distance between the outer side wall of the second protrusion and the inner side wall thereof decreases.

5. The puncture-proof needle according to claim 3, characterized in that: A groove is provided at the junction of the second protrusion and the first protrusion, and the groove is opened along the height direction of the second protrusion; When the sheath moves along the limiting slide, the ratchet slides in the groove; when the sheath is rotated, the ratchet is rotated out of the groove and slides along the outer side wall of the second protrusion into the first slot.

6. The puncture-proof needle according to claim 3, characterized in that: A connecting arm is provided between two adjacent limiting blocks, and the inner and outer sides of the connecting arm are respectively fitted to the fixing seat and the supporting protrusion.

7. The puncture-proof needle according to claim 2, characterized in that: The bottom of the sheath is provided with the ratchet teeth, and the top surface of the first protrusion is correspondingly provided with a second slot; When the sheath is rotated, the ratchet can be engaged into the second engaging groove along the top surface of the first protrusion.

8. The puncture-proof needle according to claim 7, characterized in that: The top edge of the first protrusion includes a first inclined surface, the first inclined surface is inclined toward the direction of the second protrusion and the sheath, and the junction between the top surface of the first protrusion and the second slot forms a protruding end; The bottom end of the limit block near the second protrusion includes a second inclined surface, the second inclined surface is inclined toward the first protrusion and is adapted to the inclination angle of the first inclined surface; the bottom end of the limit block is provided with an opening; When the sheath is rotated, the second inclined surface slides over the first inclined surface and moves to the junction of the first protrusion and the second protrusion, so that the ratchet is engaged in the second groove and the protruding end is engaged in the opening.

9. The puncture-proof needle according to claim 2, characterized in that: The ratchet is provided on the side wall of the limit block, and the outer side wall of the fixing seat is correspondingly provided with a limit tooth, and the limit tooth and the outer side wall of the fixing seat form a third slot; the inclination direction of the limit tooth is opposite to the bending direction of the ratchet; When the sheath is rotated, the ratchet can slide over the outer wall of the limiting tooth and be engaged in the third engaging groove.

10. The puncture-proof needle according to claim 9, characterized in that: The ratchet is arc-shaped, the concave surface of the ratchet is arranged toward the outside of the limit block, and a first positioning groove is provided along the height direction of the ratchet; the edge of the second protrusion is provided with a second positioning groove along the height direction of the ratchet; When the sheath moves along the limiting slideway, the edge of the second protrusion is snapped into the first positioning groove and slides, and at the same time, the edge of the limiting block is snapped into the second positioning groove and slides.

11. The puncture-proof needle according to claim 9, characterized in that: An opening is concavely provided at the end of the limiting block facing the fixing seat. When the sheath moves along the limiting slideway, the limiting tooth is inserted into the opening.

12. The puncture-proof needle according to claim 2, characterized in that: The outer wall of the sheath is provided with at least one avoidance channel along its axial direction, and each of the support protrusions can be inserted into one of the avoidance channels; The bottom end of the ratchet is connected to the lower end of the avoidance channel, and the top end of the ratchet is inclined in a direction away from the second protrusion, so that the top end of the ratchet and the side wall of the avoidance channel form a fourth slot; The first protrusion is provided with a vertical groove along the height direction, and the ratchet can be correspondingly inserted into the vertical groove and slide; When the sheath is rotated, the ratchet can slide out of the vertical slot and abut against the edge of the second protrusion, and at the same time, the top end of the second protrusion can be snapped into the fourth slot.

13. The puncture-proof needle according to claim 12, characterized in that: The ratchet is provided in the middle of the lower end of the avoidance channel so that the distances between the two side walls of the avoidance channel and the two ends of the ratchet are the same; The bottom of the sheath is provided with a blind groove in an inwardly concave manner, and the blind groove is staggered with the avoidance channel.

14. The puncture-proof needle according to claim 2, characterized in that: Also includes: a needle inserted into the needle seat and glued and fixed to the top end of the second seat; Wherein, the adhesive connection point between the needle head and the second seat body is lower than the upper surface of the fixing seat.

15. The puncture-proof needle according to claim 2, characterized in that: The side wall of the first protrusion is provided with a first guiding angle; The end portion of the top surface of the first protrusion is provided with a second guiding bevel.

16. The puncture-proof needle according to claim 1, characterized in that: The end of the limit block facing the fixing seat is provided with an opening in a concave manner, and the limit block is provided with a limit strip located in the opening, and the limit strip is made of elastic material; the outer side wall of the upper end of the fixing seat is provided with a limit groove correspondingly along the circumferential direction; When the sheath moves along the needle seat, the limiting strip is squeezed and abuts against the outer side wall of the fixing seat; when the sheath is pushed to the upper end of the supporting protrusion, the limiting strip is inserted into the limiting groove.

17. The puncture-proof needle according to claim 1, characterized in that: An annular groove is formed at the bottom of the second seat body, and an annular hook is provided on the inner side wall of the bottom end of the fixing seat. The fixing seat and the second seat body are interference fit, and the annular hook can be embedded in the annular groove, so that the fixing seat and the needle seat are fixed.

18. The puncture-proof needle according to claim 1, characterized in that: The upper edge of the fixing seat is provided with an annular flange, and the inner side wall of the lower end of the sleeve is provided with an annular rim. When the sleeve is pushed to the upper end of the supporting protrusion, the annular flange abuts against the upper side of the annular rim.

19. The puncture-proof needle according to claim 1, characterized in that: The outer side wall of the bottom end of the needle seat is provided with anti-slip grooves; The outer side wall of the sheath is provided with an anti-slip groove.

20. An injection pen, characterized in that: include: Injection tube body; as well as The puncture-proof needle according to any one of claims 1 to 19, wherein the puncture-proof needle is detachably connected to the injection tube body.

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