Safety anti-needlestick self-destructive injection needle

Abstract

A safe needle-proof self-destructive injection needle includes a needle cap, a needle seat, a spring, a needle tube, and a needle cap rotation check structure. The needle cap is provided with a first spring limit structure and a clamping column, and the needle seat is correspondingly provided with a second spring limit structure and a guide groove. The two ends of the spring are respectively installed on the first spring limit structure and the second spring limit structure, and automatically form a forward elastic force and a forward rotation torque to the needle cap during the assembly process. In the initial state, the clamping column is located at the initial fixed position of the guide groove; during use, the needle cap and the clamping column move backward, and the needle tube extends; during the self-destruction process, the needle cap extends to cover the needle tube, and the needle cap rotates forward, and the needle cap rotation check structure takes effect to prevent the needle cap from rotating in the reverse direction. The entire product has a stable structure, simple process and high economic benefits, and realizes automatic self-destruction. In the self-destruction state, the overall structure is stable and effective, and has a good shielding and protection effect on the double-ended needle tips of the needle tube, thereby improving safety.

Description

Technical Field

[0001] The invention belongs to the technical field of syringes, and in particular relates to an injection needle. Background Art

[0002] Pen-type injection devices such as insulin pens and injection needles have been widely used as a method of treating diabetes. Among them, the insulin pen carries a prescribed amount of insulin liquid medicine and is reusable, while the injection needle is a disposable needle with a safety protection device.

[0003] Chinese invention patent publication number CN10449195B discloses a safety insulin pen needle. The advantage of this type of insulin pen needle is that during the insulin injection process, the protector is triggered, and after the injection is completed, the needle tip is instantly protected, which can prevent the needle tip from causing harm to the doctor or patient.

[0004] However, the above-mentioned type of safety insulin pen needle also has some structural instability defects. When the user uses the insulin pen needle correctly according to the regulations, the automatic protection of the needle by the trigger protector is effective. However, some users have the habit of rotating the insulin pen needle when removing the needle after the insulin injection is completed. In this process, due to the unstable structure and low reliability of the trigger device, the automatic protection function of the needle by the trigger protector is likely to fail due to the rotation. Since the automatic protection of the needle fails due to the rotation of the insulin pen needle when the needle is removed, it is now necessary to make improvements to the insulin pen needle to prevent the risk of automatic protection failure.

[0005] In addition, most products on the market currently have numerous accessories, complex processes, and low economic benefits. It is now necessary to develop an injection needle with a stable structure, simple process, and high economic benefits. Summary of the invention

[0006] The present invention aims at solving the above problems and provides a safe needle-proof self-destructive injection needle.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] Safety anti-needlestick self-destructive injection needle, including:

[0009] The needle cap is embedded in the front end of the needle seat, the front end of the needle cap is provided with a through hole arranged along the axis, the inner side of the front end is provided with a first spring limiting structure, and the outer side wall is provided with a clamping column;

[0010] The needle seat is provided with a second spring limiting structure and a needle tube fixing hole arranged along the axis, and a guide groove matched with the clamping column of the needle cap is provided on the side wall;

[0011] The spring is located in the cavity formed by the inner cavity of the needle cap and the inner cavity of the needle seat, and the two ends of the spring are respectively installed on the first spring limiting structure and the second spring limiting structure;

[0012] A needle tube is fixed in the needle tube fixing hole of the needle seat; and

[0013] The needle cap rotation anti-reverse structure plays a role in preventing the needle cap from rotating in the reverse direction in the self-destruct state.

[0014] Among them, in the initial state, the needle cap extends forward, the clamping column of the needle cap is located at the initial fixed position of the guide groove of the needle seat, and the spring is compressed and twisted during assembly to provide the needle cap with forward elastic force and positive rotation torque.

[0015] During use, the needle cap retracts due to external force, the clamping column of the needle cap slides backward along the guide groove of the needle seat, the front end of the needle tube extends out of the through hole of the needle cap, and the spring is further compressed.

[0016] In the self-destruct state, the needle cap extends forward to cover the front end of the needle tube under the elastic force and torque of the spring, and rotates forward. The clamping column of the needle cap slides to the self-destruct fixed position of the guide groove of the needle seat. At this time, the needle cap rotation check structure prevents the needle cap from rotating reversely.

[0017] Preferably, the first spring limiting structure of the needle cap comprises: a truncated cone, coaxially arranged on the inner side of the front end of the needle cap, with a through hole on the truncated cone; a first guide surface, arranged on the rear end surface of the truncated cone; and a first spring slot, arranged on the first guide surface. The front end of the spring is sleeved on the truncated cone, and the front end of the spring is provided with a first hook formed by bending the end of the spring wire inward, and the first hook slides along the first guide surface and snaps into the first spring slot. In some embodiments, the first guide surface is a curved surface extending along a spiral line around the axis of the truncated cone and having a circle less than or equal to one, and the first spring slot is arranged at the front end of the first guide surface.

[0018] Preferably, the needle cap adopts a split structure, including: an end head, which is provided with a through hole and a first spring limiting structure; and a cap body, which is cylindrical with two ends open, the front end of the cap body is connected to the end head, and a clamping column is provided on the outer wall of the cap body.

[0019] Preferably, the needle seat is cylindrical with openings at both ends, and a transverse partition is provided inside the needle seat to divide the interior into two front and rear cavities. A needle tube assembly base is provided in the front cavity of the needle seat along the axis and connected to the transverse partition, and a needle tube fixing hole and a second spring limiting structure are provided on the needle tube assembly base.

[0020] Preferably, the second spring limiting structure of the needle seat includes: an annular boss, which is arranged on the rear end outer wall of the needle tube assembly base and connected to the diaphragm; a second guide surface, which is arranged on the front end surface of the annular boss; and a second spring slot, which is arranged on the second guide surface. The rear end of the spring is sleeved on the annular boss, and the rear end of the spring is provided with a second hook formed by bending the end of the spring wire inward, and the second hook slides along the second guide surface and snaps into the second spring slot. In some embodiments, the second guide surface is an arc-shaped concave surface extending in the circumferential direction and concave toward the rear, and the second spring slot is arranged at the lowest point of the concave of the second guide surface.

[0021] Preferably, the torsion of the spring is generated by the circumferential angle between the ends of the spring wire at both ends being changed by the first spring limiting structure of the needle cap and the second spring limiting structure of the needle seat. In some embodiments, the circumferential angle between the ends of the spring wire at both ends of the spring is changed from 180° to 90° by the first spring limiting structure of the needle cap and the second spring limiting structure of the needle seat.

[0022] There are multiple structures designed for the guide groove of the needle seat and the needle cap rotation check structure.

[0023] Preferably, the guide groove of the needle seat includes: a telescopic section extending in the axial direction; an elastic arm disposed in the telescopic section and enclosing the front part of one side of the telescopic section corresponding to the reverse direction to form a starting area; and a rotating section extending in the positive direction and connected to the front part of the other side of the telescopic section corresponding to the positive direction. The starting area serves as the initial fixing position of the needle cap's clamping column. In the initial state, the needle cap can extend forward to cover the front end of the needle tube; the elastic arm prevents the clamping column that slides backward from the starting area from re-entering the starting area; the rotating section serves as the self-destructing fixing position of the needle cap's clamping column. In addition, a guide groove is provided on the inner side wall of the needle seat, the front end of the guide groove extends to the front end surface of the needle seat, and the rear end of the guide groove extends to the starting area. The guide groove guides the needle cap's clamping column so that the clamping column can be smoothly clamped into the starting area.

[0024] In some examples implemented on the basis of the guide groove of the needle seat, the needle cap rotation anti-reverse structure includes: an anti-reverse protrusion, which is arranged on the outer wall of the needle cap; and an anti-reverse stopper, which is arranged on the inner wall of the needle seat. In the process of the needle cap rotating forward, the anti-reverse protrusion passes over the anti-reverse stopper to form a lock to prevent the needle cap from rotating reversely.

[0025] In some other examples implemented on the basis of the guide groove of the needle seat, the safety needle-proof self-destructive injection needle also includes: a sheath in the shape of a sleeve and sleeved on the outer side of the needle seat. The needle cap rotation check structure includes: a check slot, arranged on the outer side wall of the needle cap; an avoidance groove, arranged on the outer side wall of the needle seat; and a check elastic arm, arranged on the side wall of the sheath and inclined in the axial direction relative to the inner side wall of the sheath. In the initial state, the check slot and the check elastic arm are staggered in the circumferential direction, the check elastic arm is located in the avoidance groove and the front end is against the outer side wall of the needle cap; in the self-destructive state, the check elastic arm corresponds to and is stuck in the check slot in the circumferential direction, forming a lock to prevent the needle cap from rotating in reverse. In addition, an axially extending rib may be provided on the outer side wall of the needle seat, and an axially extending groove may be provided on the inner side wall of the sheath, and the needle seat and the sheath are tightly assembled by the cooperation of the rib and the groove.

[0026] Preferably, the guide groove of the needle seat includes: a telescopic section extending in the axial direction; a snap-in section connected to the front part of the telescopic section in the opposite direction, the front end of the snap-in section extending to the front end surface of the needle seat for the needle cap to snap in; a starting section connected to the rear part of the other side in the positive direction of the telescopic section; a rotating section connected to the front part of the other side in the positive direction of the telescopic section; and an elastic arm blocking the front end of the telescopic section, the suspended end of the elastic arm extending into the snap-in section, and forming a passage opening in the snap-in section with a width smaller than that of the snap-in column. The starting section serves as the initial fixing position of the needle cap's snap-in column, and in the initial state, the front end of the needle tube can also pass through the through hole of the needle cap to expose a section; the rotating section serves as the self-destructing fixing position of the needle cap's snap-in column.

[0027] In some examples implemented on the basis of the guide groove of the needle seat, the needle cap rotation anti-reverse structure includes: a latching tooth, which is arranged on the side of the latching column of the needle cap; and a reverse latching tooth, which is arranged in the rotating section. In the process that the needle cap rotates forward and the latching column of the needle cap slides along the rotating section, the latching tooth passes over the reverse latching tooth, forming a lock to prevent the needle cap from rotating in the reverse direction.

[0028] In some other examples implemented on the basis of the guide groove of the needle seat, the needle cap rotation check structure includes: an end plane, which is arranged on the rear side of the side of the needle cap's clamping column; and a check protrusion, which is arranged on the elastic arm, and the check protrusion makes the connection between the telescopic section and the rotating section form a bayonet with a width smaller than the end plane. In the self-destruction state, the needle cap's clamping column is blocked by the check protrusion and the end plane is blocked by the bayonet and is limited in the rotating section, forming a lock to prevent the needle cap from rotating in reverse.

[0029] In addition, the safe needle-stick-proof self-destructive injection needle may also include: a sheath, which is sleeve-shaped and sleeved on the outside of the needle seat; and an outer protective sheath, which sleeves on the outside of the sheath to provide overall protection for the injection needle.

[0030] The safety needle-stick-proof self-destructive injection needle also includes a lower spring, which is located in the inner cavity of the needle seat and below the spring; a needle tip shield, which is located below the lower spring and embedded in the tail end of the needle seat, and has a lower clamping column on the outer wall; and a needle seat rotation anti-reverse structure, which plays a role in preventing the needle tip shield from rotating in reverse when in the self-destructive state;

[0031] Wherein, in the initial state, the needle tip shield retreats, the lower clamping column is located at the initial fixed position of the lower guide groove of the needle seat, and the lower spring is compressed and twisted during assembly to provide backward elastic force and forward rotation torque to the needle tip shield.

[0032] During use, the needle tip shield is pressed forward by an external force, and the lower clamping column slides forward along the lower guide groove.

[0033] In the self-destruction state, the needle tip shield retreats to cover the tail end of the needle tube under the elastic force and torsion of the lower spring and rotates forward, and the lower clamping column slides to the self-destruction fixed position of the lower guide groove.

[0034] Preferably, the lower guide groove comprises: a lower telescopic section extending in the axial direction; a lower elastic arm arranged in the lower telescopic section and enclosing a tail portion of one side of the lower telescopic section corresponding to the reverse direction to form a lower starting area; and a lower rotating section extending in the forward direction and communicating with the tail portion of the other side of the lower telescopic section corresponding to the forward direction;

[0035] The lower starting area serves as the initial fixing position of the lower clamping column, the lower elastic arm prevents the lower clamping column that slides forward from the lower starting area from re-entering the lower starting area, and the lower rotating section serves as the self-destructing fixing position of the lower clamping column.

[0036] Compared with the prior art, the invention has the following beneficial effects: a first spring limiting structure and a clamping column are arranged on the needle cap, a second spring limiting structure and a guide groove are arranged on the needle seat, two ends of the spring are respectively mounted on the first spring limiting structure and the second spring limiting structure, and a forward elastic force and a forward rotation torque are automatically formed to provide the needle cap with a needle cap rotation check structure during the assembly process. Among them, the guide groove of the needle seat and the needle cap rotation check structure are designed with a variety of structures.

[0037] In the initial state, the clamping column of the needle cap is located at the initial fixed position of the guide groove of the needle seat; during the injection process, the needle cap is passively retracted into the needle seat, the clamping column of the needle cap slides backward along the guide groove of the needle seat, the front end of the needle tube extends out of the through hole of the needle cap, and the spring is further compressed; during the self-destruction process, the needle cap extends out under the axial elastic force of the spring to cover the needle tube, and the needle cap rotates forward under the positive torque of the spring, and the needle cap rotation check structure takes effect to prevent the needle cap from rotating in the reverse direction; in addition, the tail end of the needle tube is also provided with a shielding structure symmetrical to the front end of the needle tube.

[0038] The entire product has a stable structure, simple process and high economic benefits, and realizes automatic self-destruction. When in the self-destruction state, the overall structure is stable and effective, and has a good shielding and protection effect on the double-ended needle tips of the syringe, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of Example 1 in the initial state;

[0040] Figure 2 is a cross-sectional view of Example 1 in an initial state;

[0041] Figure 3 It is a schematic diagram of the decomposition structure of Example 1;

[0042] Figure 4 is a schematic structural diagram of the needle cap in Example 1;

[0043] Figure 5 is a structural schematic diagram of the needle seat in Example 1;

[0044] Figure 6 is another structural schematic diagram of the needle holder in Example 1;

[0045] Figure 7 It is a schematic diagram of the corresponding relationship between the top view and the three-dimensional view of the spring in Example 1;

[0046] Figure 8 Schematic diagram of the changes before and after the spring, needle cap and needle seat are assembled in Example 1;

[0047] Fig. 9 This is a schematic diagram of the change from the initial state to the self-destruct state of Example 1;

[0048] Fig.10 is a cross-sectional view of Example 1 in a self-destructing state;

[0049] Fig.11 A three-dimensional diagram of the cooperation between the anti-return protrusion of the needle cap and the anti-return stopper of the needle seat in the self-destruction state of Example 1;

[0050] Fig.12 A top view of the cooperation between the anti-return protrusion of the needle cap and the anti-return stopper of the needle seat in the self-destruction state of Embodiment 1;

[0051] Fig.13 is a cross-sectional view of Example 2 in an initial state;

[0052] Fig.14 It is a schematic diagram of the exploded structure of the needle cap, needle seat and sheath in Example 2;

[0053] Fig.15 is a schematic diagram of the exploded structure of the needle cap and the sheath in Example 2;

[0054] Fig.16 is a schematic diagram of the internal structure of the sheath in Example 2;

[0055] Fig.17 This is a schematic diagram of the change from the initial state to the self-destruct state of Example 2;

[0056] Fig.18 It is a schematic diagram of the structure of the cooperation between the anti-return groove of the needle cap and the anti-return elastic arm of the sheath in the self-destruction state of Example 2;

[0057] Fig.19 This is a schematic diagram of the structure of Example 3 in the initial state;

[0058] Fig. 20 is a schematic structural diagram of the needle cap in Example 3;

[0059] Fig.21 is a schematic structural diagram of the needle holder in Example 3;

[0060] Fig. 22 This is a schematic diagram of the change from the initial state to the self-destruct state of Example 3;

[0061] Fig.23 It is a schematic diagram of the structure of embodiment 3 equipped with a sheath and an outer protective sheath;

[0062] Fig.24 This is a schematic diagram of the structure of Example 4 in the initial state;

[0063] Fig.25 It is a schematic diagram of the exploded structure of the needle cap and the needle seat in Example 4;

[0064] Fig.26 This is a schematic diagram of the change from the initial state to the self-destruct state of Example 4;

[0065] Fig. 27 It is a schematic diagram of the structure of embodiment 4 equipped with a sheath and an outer protective sheath;

[0066] Fig.28 This is a schematic diagram of the structure of the needle seat of Example 5 equipped with a lower spring and a needle tip shield;

[0067] Fig.29 Schematic diagram of the exploded structure of the needle seat, lower spring and needle tip shield in Example 5;

[0068] Fig.30 This is a schematic diagram of the structure of Example 5 in the initial state;

[0069] Fig.31 This is a schematic diagram of the structure of Example 5 in a self-destruct state;

[0070] Fig.32This is a schematic diagram of the structure of the needle tip shield and the needle tube of Example 5 in the self-destruct state.

[0071] The reference numerals are as follows:

[0072] 1 needle cap

[0073] 101 through hole

[0074] 102 Round Table

[0075] 103 first guide surface

[0076] 104 first spring slot

[0077] 105 card column

[0078] 1051 tooth

[0079] 1052 end plane

[0080] 106 backstop bump

[0081] 1061 First Incline

[0082] 107 terminal

[0083] 108 cap body

[0084] 109 Check slot

[0085] 2-pin header

[0086] 201 diaphragm

[0087] 202 needle tube assembly base

[0088] 203 annular boss

[0089] 204 second guide surface

[0090] 205 second spring slot

[0091] 206 guide groove

[0092] 2061 telescopic section

[0093] 2062 elastic arm

[0094] 20621 backstop bulge

[0095] 2063 Rotating Segment

[0096] 2064 card into the segment

[0097] 2065 start segment

[0098] 207 guide groove

[0099] 208 backstop block

[0100] 2081 second slope

[0101] 209 Avoidance slot

[0102] 210 ribs

[0103] 211 reverse tooth

[0104] 212 lower guide groove

[0105] 2121 lower telescopic section

[0106] 2122 lower elastic arm

[0107] 2123 Lower rotating section

[0108] 3 Spring

[0109] 301 first hook

[0110] 302 second hook

[0111] 4-needle tube

[0112] 5. Sheath

[0113] 501 backstop elastic arm

[0114] 502 groove

[0115] 6. Outer protective cover

[0116] 7 Lower spring

[0117] 8 needle tip sheath

[0118] 801 lower column. DETAILED DESCRIPTION

[0119] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention is described in conjunction with its preferred specific embodiments, these embodiments are only illustrative, rather than limiting the scope of the present invention.

[0120] Example 1

[0121] See also Figures 1 to 3, a safe needle-stick-proof self-destructive injection needle, comprising a needle cap 1, a needle seat 2, a spring 3, a needle tube 4, and a needle cap rotation check structure. The needle cap 1 is embedded in the front end of the needle seat 2. The spring 3 is located in the cavity formed by the inner cavity of the needle cap 1 and the inner cavity of the needle seat 2, and the two ends are respectively installed in the needle cap 1 and the needle seat 2. The spring 3 is compressed and twisted when assembled with the needle cap 1 and the needle seat 2, providing the needle cap 1 with an elastic force to move forward in the axial direction and a torque to rotate in the positive direction in the circumferential direction, so that the needle cap 1 can extend forward and rotate positively when the injection needle enters the self-destruction state. The needle tube 4 is fixed in the needle seat 2, and the front end of the needle tube 4 cooperates with the needle cap 1 to be telescoped to be shielded or exposed. The needle cap rotation check structure plays a role in preventing the needle cap 1 from rotating in the reverse direction when the injection needle is in the self-destruction state. Among them, "positive" is a description relative to "reverse", which can be clockwise or counterclockwise. Please see below for specific instructions.

[0122] See also Figure 4 The needle cap 1 is in a sleeve shape, and a through hole 101 arranged along the axis is provided at the front end of the needle cap 1 for the front end of the needle tube 4 to pass through the needle cap 1.

[0123] The front inner side of the needle cap 1 is provided with a first spring limiting structure for installing the front end of the spring 3. In this embodiment, the first spring limiting structure includes a truncated cone 102, a first guide surface 103, and a first spring clamping groove 104. The truncated cone 102 is provided for the front end of the spring 3 to be sleeved. The truncated cone 102 is arranged on the front inner side of the needle cap 1 and is arranged coaxially with the needle cap 1. The truncated cone 102 is provided with the above-mentioned through hole 101; the first guide surface 103 is used to guide the first hook 301 at the front end of the spring 3 so that the first hook 301 can be smoothly clamped into the first spring clamping groove 104. The first guide surface 103 is arranged on the rear end surface of the truncated cone 102 and is a curved surface extending along the spiral line around the axis of the truncated cone 102 and is less than or equal to one circle. The figure shows a half circle; the first spring clamping groove 104 is used to clamp the first hook 301 of the spring 3. The first spring clamping groove 104 is arranged on the first guide surface 103. The first spring clamping groove 104 shown in the figure is arranged at the front end of the first guide surface 103.

[0124] One or more clamping columns 105 and one or more non-return protrusions 106 are arranged on the outer side wall of the needle cap 1 . The two or more clamping columns 105 and the two or more non-return protrusions 106 can be evenly distributed on the outer side wall of the needle cap 1 along the circumferential direction.

[0125] In addition, the needle cap 1 can be a modular structure to facilitate the processing of the first spring stop structure. In this embodiment, the needle cap 1 is composed of a terminal 107 and a cap body 108 connected together, the terminal 107 is provided with a through hole 101 and a first spring stop structure, the cap body 108 is cylindrical with two ends open, the front end of the cap body 108 is connected to the terminal 107 by an interference fit, and a clamping column 105 and a check block 106 are provided on the outer side wall of the rear end of the cap body 108.

[0126] See also Figure 5 and Figure 6 The needle seat 2 is cylindrical with both ends open. A transverse partition 201 is provided inside the needle seat 2. The transverse partition 201 divides the interior of the needle seat 2 into two cavities, front and rear. A columnar needle tube assembly base 202 is provided in the front cavity of the needle seat 2, which is connected to the transverse partition 201 and is coaxially arranged with the needle seat 2. The needle tube assembly base 202 is provided with a needle tube fixing hole that passes through the axis and in which the needle tube 4 can be fixed by environmentally friendly quick-drying glue. Figure 2 The needle cap 1 and the spring 3 are installed in the front cavity of the needle seat 2, which will be explained in detail below. The rear cavity of the needle seat 2 is used to connect with the syringe, and the rear cavity is provided with a thread or an engaging opening for connecting with the syringe.

[0127] The needle tube assembly base 202 is provided with a second spring limiting structure for installing the rear end of the spring 3. In this embodiment, the second spring limiting structure includes an annular boss 203, a second guide surface 204, and a second spring clamping groove 205. The annular boss 203 is provided for the rear end of the spring 3 to be socketed. The annular boss 203 protrudes circumferentially from the rear end outer wall of the needle tube assembly base 202 and is connected to the diaphragm 201 as a whole; the second guide surface 204 is used to guide the second hook 302 at the rear end of the spring 3 so that the second hook 302 can be smoothly inserted into the second spring groove 205. The second guide surface 204 is arranged on the front end surface of the annular boss 203 and is an arc-shaped concave surface. The number of the arc-shaped concave surfaces can be more than two and are evenly distributed along the circumference of the annular boss 203. Each arc-shaped concave surface extends circumferentially and is recessed backwards; the second spring groove 205 is used to clamp the second hook 302 of the spring 3. A second spring groove 205 is arranged on each arc-shaped concave surface. Preferably, a second spring groove 205 is arranged at the lowest point of the depression of each arc-shaped concave surface.

[0128] One or more guide grooves 206 are provided on the side wall of the needle seat 2 corresponding to the front cavity, and two or more guide grooves 206 can be evenly distributed on the side wall of the needle seat 2 along the circumferential direction. The guide grooves 206 correspond to and cooperate with the clamping columns 105 of the needle cap 1 one by one, and the guide grooves 206 are used to guide the position of the clamping columns 105. In this embodiment, each guide groove 206 includes a telescopic section 2061, an elastic arm 2062, and a rotating section 2063. The telescopic section 2061 extends along the axial direction of the needle seat 2 to provide guidance for the axial sliding of the card column 105; the elastic arm 2062 is arranged in the telescopic section 2061, and the front part of the corresponding reverse side of the telescopic section 2061 is surrounded by a starting area. The starting area serves as the initial fixed position of the card column 105. The elastic arm 2062 prevents the card column 105 that slides backward from the starting area from entering the starting area forward again; the rotating section 2063 extends along the positive direction of the needle seat 2 and is connected to the front part of the other side of the corresponding positive direction of the telescopic section 2061. The rotating section 2063 provides guidance for the positive sliding of the card column 105 and serves as a self-destructive fixed position of the card column 105.

[0129] The front end of the inner side wall of the needle seat 2 corresponding to the front cavity is provided with one or more guide grooves 207 and one or more check blocks 208. The two or more guide grooves 207 and the two or more check bumps 106 can be evenly distributed on the inner side wall of the needle seat 2 along the circumferential direction. The guide groove 207 extends along the axial direction of the needle seat 2, with the front end extending to the front end surface of the needle seat 2 and the rear end extending to the starting area in the telescopic section 2061 of the guide groove 206. The guide groove 207 is used to guide the clamping column 105 when installing the needle cap 1, so that the clamping column 105 can be inserted into the starting area in the telescopic section 2061 of the guide groove 206 through the guide groove 207. The check block 208 and the check bump 106 of the needle cap 1 constitute the needle cap check structure in this embodiment. The check bump 106 and the check block 208 are respectively provided with a first inclined surface 1061 and a second inclined surface 2081, see Fig.12 In the partial enlarged view, when the needle cap 1 rotates forwardly relative to the needle seat 2, the anti-return protrusion 106 can smoothly pass over the anti-return block 208 through the contact and cooperation between the first inclined surface 1061 and the second inclined surface 2081. Thereafter, if the needle cap 1 is rotated reversely, the anti-return protrusion 106 will be blocked by the anti-return block 208, and the needle cap 1 cannot rotate reversely.

[0130] See also Figure 7 , the spring 3 is a coil spring. The front end of the spring 3 cooperates with the first spring limiting structure of the needle cap 1. In this embodiment, the front end of the spring 3 is sleeved on the round table 102 of the needle cap 1, and the end of the spring wire at the front end of the spring 3 is bent inward to form a first hook 301, and the first hook 301 slides along the first guide surface 103 of the needle cap 1 and is clamped into the first spring clamping groove 104. The rear end of the spring 3 cooperates with the second spring limiting structure of the needle seat 2. In this embodiment, the rear end of the spring 3 is sleeved on the annular boss 203 of the needle seat 2, and the end of the spring wire at the rear end of the spring 3 is bent inward to form a second hook 302, and the second hook 302 slides along the second guide surface 204 of the needle seat 2 and is clamped into the second spring clamping groove 205.

[0131] It should be noted that after the needle cap 1, the needle seat 2 and the spring 3 are assembled, the spring 3 is in a compressed state, and the circumferential angle between the first hook 301 and the second hook 302 of the spring 3 changes compared with that before assembly, thus generating a torque. Figure 7 and Figure 8 The circumferential angle between the first hook 301 and the second hook 302 of the spring 3 before assembly is 180°, and the circumferential angle between the first hook 301 and the second hook 302 of the spring 3 after assembly is 90°, and matches the circumferential angle between the first spring slot 104 of the needle cap 1 and the second spring slot 205 of the needle seat 2. This arrangement allows the spring 3 to automatically form torque during assembly, simplifies the assembly process, and improves assembly efficiency.

[0132] When the injection needle is in the initial state, Fig. 9 At this time, the needle cap 1 covers the front end of the needle tube 4, the clamping column 105 of the needle cap 1 is located in the starting area of ​​the telescopic section 2061 of the guide groove 206 of the needle seat 2, and the spring 3 is in a compressed and torsion state.

[0133] When this needle is used for injection, see Fig. 9 The middle part of the needle cap 1, which is against the injection site, will be retracted into the needle seat 2 by the reaction force. During the retraction of the needle cap 1, the clamping column 105 of the needle cap 1 slides backward from the starting area in the telescopic section 2061 of the guide groove 206 of the needle seat 2. When the clamping column 105 of the needle cap 1 passes through the elastic arm 2062, the elastic arm 2062 will be elastically deformed. After the clamping column 105 of the needle cap 1 passes over the elastic arm 2062, the elastic deformation of the elastic arm 2062 is restored. The clamping column 105 of the needle cap 1 can no longer enter the starting area in the telescopic section 2061 of the guide groove 206, and the spring 3 is further compressed.

[0134] The injection needle will enter self-destruction immediately after being pulled out after injection. Fig. 9 The right part of the needle seat 2 is formed by the elastic force of the spring 3. The clamping column 105 of the needle cap 1 slides forward to the front end along the portion outside the starting area in the telescopic section 2061 of the guide groove 206 of the needle seat 2, and the needle cap 1 extends and covers the front end of the needle tube 4. Afterwards, under the torsion of the spring 3, the clamping column 105 of the needle cap 1 enters the rotating section 2063 of the guide groove 206 of the needle seat 2, and slides from one end of the rotating section 2063 to the other end, and the needle cap 1 rotates forward. In this process, the needle cap rotation check structure takes effect. Specifically, the check protrusion 106 of the needle cap 1 smoothly passes over the check block 208 through the cooperation of the first inclined surface 1061 and the second inclined surface 2081 of the check block 208, forming a lock to prevent the needle cap 1 from rotating in the reverse direction.

[0135] Finally, the self-destruct state of this injection needle is shown in Fig.10 , the front end of the needle tube 4 is hidden in the needle cap 1 and shielded by the needle cap 1. And at this time, see Fig.11 and Fig.12 The anti-return protrusion 106 of the needle cap 1 cooperates with the anti-return block 208 of the needle seat 2 to form a lock that prevents the needle cap 1 from rotating in the reverse direction. If the needle cap 1 is rotated in the reverse direction, the anti-return protrusion 106 will be blocked by the anti-return block 208, thereby ensuring the stability of the entire structure of the needle cap 1 covering the front end of the needle tube 4, effectively preventing the needle cap 1 from rotating in the reverse direction under the action of a force that is not sufficient to destroy the lock, and avoiding the occurrence of automatic protection failure caused by the clamping column 105 of the needle cap 1 returning to the telescopic section 2061 of the guide groove 206 of the needle seat 2.

[0136] Example 2

[0137] See also Fig.13 and Fig.14 The invention discloses a safe needle-stick-proof self-destructive injection needle, comprising a needle cap 1, a needle seat 2, a spring 3, a needle tube 4, and a needle cap rotation check structure. The difference from the embodiment 1 is that a protective sheath (also called a middle sheath or a clamping piece) 5 is added, and the needle cap rotation check structure is redesigned.

[0138] See also Fig.14 and 15 The needle cap 1 has no reverse stop protrusion 106 in the first embodiment. The needle cap 1 is redesigned to have one or more reverse stop slots 109 on the outer wall thereof. The two or more reverse stop slots 109 may be evenly distributed on the outer wall of the needle cap 1 along the circumferential direction. The reverse stop slots 109 are used to cooperate with the reverse stop elastic arm 501 of the sheath 5 to prevent the needle cap 1 from rotating in the reverse direction.

[0139] The backstop block 208 in the first embodiment is removed from the needle seat 2. The needle seat 2 is redesigned to have one or more avoidance grooves 209 at the front end of the outer wall of the needle seat 2, and the two or more avoidance grooves 209 can be evenly distributed on the outer wall of the needle seat 2 along the circumferential direction, and the avoidance grooves 209 are used to avoid the backstop elastic arms 501 of the sheath 5. In addition, the outer wall of the needle seat 2 is provided with one or more axially extending ribs 210 at the rear, and the two or more ribs 210 can be evenly distributed on the outer wall of the needle seat 2 along the circumferential direction, and the ribs 210 are used to cooperate with the grooves 502 of the sheath 5 to achieve a tight fit between the needle seat 2 and the sheath 5.

[0140] The sheath 5 is a newly added component of this embodiment. The sheath 5 is in the shape of a sleeve with two ends open. The sheath 5 is sleeved on the outside of the needle seat 2. The difference from the ordinary sheaths in the art is that the front part of the side wall of the sheath 5 is provided with one or more anti-return elastic arms 501. The two or more anti-return elastic arms 501 can be evenly distributed on the side wall of the sheath 5 along the circumferential direction. Each anti-return elastic arm 501 is inclined in the axial direction relative to the inner side wall of the sheath 5. The anti-return elastic arm 501 is used to be stuck in the anti-return groove 109 of the needle cap 1 to prevent the needle cap 1 from rotating in the reverse direction. In addition, the rear part of the inner side wall of the sheath 5 is provided with one or more axially extending grooves 502, see Fig.16 More than two grooves 502 may be evenly distributed on the inner wall of the sheath 5 along the circumferential direction. The sheath 5 cooperates with the convex rib 210 of the needle seat 2 through the grooves 502 to achieve a tight assembly with the needle seat 2.

[0141] Preferably, the outer wall of the needle cap 1 is evenly distributed with two anti-return grooves 109 along the circumferential direction, the front end of the outer wall of the needle seat 2 is evenly distributed with two avoidance grooves 209 along the circumferential direction, the rear part of the outer wall of the needle seat 2 is evenly distributed with four convex ribs 210 along the circumferential direction, the front part of the side wall of the sheath 5 is evenly distributed with four anti-return elastic arms 501 along the circumferential direction, and the rear part of the inner wall of the sheath 5 is evenly distributed with four grooves 502 along the circumferential direction. The working process of the safety needle-proof self-destructive injection needle is described with this preferred embodiment, as shown below.

[0142] When the injection needle is in the initial state, Fig.17 The left side part of the needle cap 1, needle seat 2, spring 3, and needle tube 4 at this time can refer to the description of embodiment 1. The difference is that the two reversal elastic arms 501 (see Fig.17 The two anti-return elastic arms (marked on the left part) correspond to the two anti-return grooves 109 of the needle cap 1 in the circumferential direction, but are blocked by the front part of the side wall of the needle seat 2 and undergo obvious elastic deformation, thereby separating from the two anti-return grooves 109 of the needle cap 1; the other two anti-return elastic arms ( Fig.17 The left part is not shown) is staggered with the two non-return grooves 109 of the needle cap 1 in the circumferential direction and is respectively located in the two avoidance grooves 209 of the needle seat 2. Due to the avoidance grooves 209, the two non-return elastic arms maintain a posture inclined toward the axial direction, and the front ends of the two non-return elastic arms symmetrically abut against the outer side wall of the needle cap 1.

[0143] The working process of the needle cap 1, needle seat 2, spring 3 and needle tube 4 of the injection needle head during injection and self-destruction can be described with reference to Example 1. The difference is that during the forward rotation of the needle cap 1 after self-destruction, the front ends of the other two reversing elastic arms 501 of the sheath 5 always press against the outer wall of the needle cap 1 until the needle cap 1 rotates to the right position. Fig.17 The right part and Fig.18 , the other two check elastic arms 501 (see Fig.17 The right part and Fig.18 The anti-return elastic arms marked on the top) correspond to and are inserted into the two anti-return grooves 109 of the needle cap 1 in the circumferential direction. At this time, the injection needle is in a self-destructive state with stable structure, and the needle cap 1 cannot rotate reversely.

[0144] Example 3

[0145] See also Fig.19 The invention discloses a safe needle-stick-proof self-destructive injection needle, comprising a needle cap 1, a needle seat 2, a spring 3, a needle tube 4, and a needle cap rotation check structure. The difference from the embodiment 1 is that the clamping column 105 of the needle cap 1, the guide groove 206 of the needle seat 2, and the needle cap rotation check structure are redesigned.

[0146] See also Fig. 20 The needle cap 1 has no reverse stopper 208 in Embodiment 1. The needle cap 1 is redesigned to have a latching tooth 1051 on the side of the latching column 105 to cooperate with the reverse latching tooth 211 in the guide groove 206 of the needle seat 2, thereby preventing the needle cap 1 from rotating in the reverse direction in the self-destruction state. In this embodiment, the latching tooth 1051 is located on the corresponding reverse side of the side of the latching column 105, including two teeth formed by the front and rear concave portions of the side.

[0147] See also Fig.21The guide groove 207 and the backstop block 208 in the embodiment 1 are cancelled on the needle seat 2, and the guide groove 206 of the needle seat 2 is redesigned. In this embodiment, each guide groove 206 includes a telescopic section 2061, a snap-in section 2064, a starting section 2065, a rotating section 2063, and an elastic arm 2062. The telescopic section 2061 extends along the axial direction of the needle seat 2 to provide a guide for the axial sliding of the clamping column 105 of the needle cap 1; the snap-in section 2064 is connected to the front part of the corresponding reverse side of the telescopic section 2061, and the front end of the snap-in section 2064 extends to the front end surface of the needle seat 2 for the clamping column 105 of the needle cap 1 to be snapped in; the starting section 2065 is connected to the rear part of the other side of the corresponding positive direction of the telescopic section 2061, and the starting section 2065 serves as the initial fixed position of the clamping column 105 of the needle cap 1; the rotating section 2063 is connected to the front part of the other side of the corresponding positive direction of the telescopic section 2061, and the rotating section 2063 serves as the self-destructive fixed position of the clamping column 105 of the needle cap 1; the elastic arm 2062 blocks the front end of the telescopic section 2061, and the suspended end of the elastic arm 2062 extends into the snap-in section 2064, and forms a passageway with a width slightly smaller than that of the clamping column 105 in the snap-in section 2064.

[0148] The needle seat 2 is also redesigned to have an inverted latching tooth 211 in the rotating section 2063 of the guide groove 206 to cooperate with the latching tooth 1051 on the latching column 105 of the needle cap 1, thereby preventing the needle cap 1 from rotating in reverse direction in the self-destruction state. In this embodiment, the inverted latching tooth 211 includes two teeth formed on the front and rear sides of the rotating section 2063.

[0149] The difference during assembly is that the assembly between the clamping column 105 of the needle cap 1 and the guide groove 206 of the needle seat 2 is specifically that the clamping column 105 of the needle cap 1 is clamped from the front end of the clamping section 2064 of the guide groove 206, and when passing through the suspended end of the elastic arm 2062 in the clamping section 2064, the elastic arm 2062 will be elastically deformed, and after the clamping column 105 of the needle cap passes over the elastic arm 2062, the elastic arm 2062 is elastically deformed and restored, and the clamping column 105 of the needle cap 1 cannot return and is disengaged, and then the clamping column 105 of the needle cap 1 enters the telescopic section 2061, and then clamps into the starting section 2065, completing the assembly. The assembly instructions of the remaining components can refer to Example 1.

[0150] When the injection needle is in the initial state, Fig. 22 In the left part, the clamping column 105 of the needle cap 1 is clamped in the starting section 2065 of the guide groove 206 of the needle seat 2, the spring 3 is in a compressed and twisted state, and the front end of the needle tube 4 passes through the through hole of the needle cap 1 and is exposed.

[0151] When the injection needle is used for injection, the needle cap 1 against the injection site will be retracted into the needle seat 2 by the reaction force. During the retraction of the needle cap 1, the clamping column 105 of the needle cap 1 will slide from the starting section 2065 of the guide groove 206 of the needle seat 2 into the telescopic section 2061, and the spring 3 will be further compressed. The more specific description of the direction of the clamping column 105 of the needle cap 1 is as follows: the clamping column 105 slides backward and reversely in the starting section 2065 at the same time, and the needle cap 1 will rotate reversely to a certain extent while retracting backward; the clamping column 105 slides backward in the telescopic section 2061.

[0152] The injection needle enters self-destruction immediately after being pulled out after injection. Under the elastic force of the spring 3, the clamping column 105 of the needle cap 1 slides forward along the telescopic section 2061 of the guide groove 206 of the needle seat 2, and the needle cap 1 extends out and covers the front end of the needle tube 4. During this process, the needle cap 1 has not yet rotated forwardly under the torsion of the spring 3, so the clamping column 105 of the needle cap 1 will no longer slide into the starting section 2065 of the guide groove 206 of the needle seat 2. When the clamping column 105 of the needle cap 1 slides forward until it is blocked by the elastic arm 2062 of the guide groove 206 of the needle seat 2, under the elastic force and torsion of the spring 3, the clamping column 105 of the needle cap 1 slides into the rotating section 2063 of the guide groove 206 of the needle seat 2, and the needle cap 1 rotates forward. During this process, the needle cap rotation anti-reverse structure takes effect. Specifically, the clamping tooth 1051 on the clamping column 105 passes over the reverse clamping tooth 211 in the rotating section 2063, forming a lock to prevent the needle cap 1 from rotating in the reverse direction.

[0153] Finally, the self-destruct state of this injection needle is shown in Fig. 22 At this time, if the needle cap 1 is rotated in the reverse direction, the latching teeth 1051 on the latching column 105 of the needle cap 1 will be caught by the reverse latching teeth 211 in the rotating section 2063 of the guide groove 206 of the needle seat 2, thus ensuring that the entire structure of the needle cap 1 covering the front end of the needle tube 4 is stable.

[0154] In addition, see Fig.23 A common sheath (also called middle sheath or clamp) 5 in the art is mounted on the outside of the needle seat, and an ordinary outer protective sheath (also called outer shell or outer needle cap) 6 in the art is mounted on the outside of the sheath 5. The outer protective sheath 6 protects the injection needle as a whole.

[0155] Example 4

[0156] See also Fig.24 , a safe needle-stick-proof self-destructive injection needle, comprising a needle cap 1, a needle seat 2, a spring 3, a needle tube 4, and a needle cap rotation check structure. This embodiment is similar to embodiment 3, except that the clamping column 105 of the needle cap 1, the guide groove 206 of the needle seat 2, and the needle cap rotation check structure are redesigned.

[0157] See also Fig.25The needle cap 1 is redesigned to have an end plane 1052 on the rear side of the side of the clamping column 105 .

[0158] The guide groove 206 of the needle seat 2 includes a telescopic section 2061, a snap-in section 2064, a starting section 2065, a rotating section 2063, and an elastic arm 2062. The description of the telescopic section 2061, the snap-in section 2064, the starting section 2065, and the rotating section 2063 can refer to the third embodiment, and the difference lies in the elastic arm 2062. The elastic arm 2062 blocks the front end of the telescopic section 2061, and the suspended end of the elastic arm 2062 extends into the snap-in section 2064, so that the snap-in section 2064 forms a passage for the clamping column 105 with a width slightly smaller than that of the needle cap 1. In addition, in this embodiment, a check protrusion 20621 is provided on the elastic arm 2062, and the check protrusion 20621 is located at the connection between the telescopic section 2061 and the rotating section 2063, so that the connection forms a clamping port with a width significantly smaller than the end plane 1052 on the clamping column 105.

[0159] The assembly can refer to Example 3 and will not be described in detail.

[0160] When the injection needle is in the initial state, Fig.26 For the left part and when it is used for injection, please refer to Example 3 and will not be described in detail.

[0161] The injection needle of this invention enters self-destruction immediately after being pulled out after injection. Under the elastic force of the spring 3, the clamping column 105 of the needle cap 1 slides forward along the telescopic section 2061 of the guide groove 206 of the needle seat 2, and the needle cap 1 extends out and covers the front end of the needle tube 4. This part has no obvious difference from the embodiment 3. The difference is that, under the elastic force and torsion of the spring 3, the clamping column 105 of the needle cap 1 will not slide forward to the through-port formed by the clamping section 2064 and the suspended end of the elastic arm 2062, but will slide forward to the clamping port formed by the elastic arm 2062 blocking the connecting portion of the telescopic section 2061 and the rotating section 2063. When the clamping column 105 passes through the clamping port, the clamping column 105 causes the elastic arm 2062 to undergo elastic deformation by squeezing the check protrusion 20621. When the clamping column 105 is clamped into the rotating section 2063, the elastic deformation of the elastic arm 2062 is restored, the clamping column 105 slides along the rotating section 2063, and the needle cap 1 rotates forward.

[0162] Finally, the self-destruct state of this injection needle is shown in Fig. 22 At this time, if the needle cap 1 is rotated in the reverse direction, the clamping column 105 of the needle cap 1 will be blocked by the anti-return protrusion 20621 on the elastic arm 2062, and because the width of the clamping hole is smaller than the end plane 1052 on the clamping column 105, the clamping column 105 is limited in the rotating section 2063, thus ensuring the stability of the entire structure of the needle cap 1 covering the front end of the needle tube 4.

[0163] In addition, see Fig. 27A common sheath (also called middle sheath or clamp) 5 in the art is mounted on the outside of the needle seat, and an ordinary outer protective sheath (also called outer shell or outer needle cap) 6 in the art is mounted on the outside of the sheath 5. The outer protective sheath 6 protects the injection needle as a whole.

[0164] Example 5

[0165] The difference between this embodiment and embodiment 1 is that in this embodiment, shielding structures are provided at both ends of the needle seat 2, see Fig.28 , Fig.29 A lower guide groove 212 which is the same as the guide groove 206 in embodiment 1 and a shielding structure at the tail of the needle seat 2 are provided at the tail of the needle seat 2 .

[0166] The shielding structure at the tail of the needle seat 2 includes a lower spring 7 and a needle tip shield 8, which are sequentially assembled into the lower part of the needle seat 2 from top to bottom, and a lower clamping column 801 is provided on the outer side wall of the needle tip shield 8.

[0167] See also Fig.30 and Fig.31 The lower guide groove 212 is symmetrical with the guide groove 206 front and back. There is more than one lower guide groove 212 on the side wall of the tail of the needle seat 2. The lower guide grooves 212 are evenly distributed on the side wall of the tail of the needle seat 2 along the circumferential direction. The lower guide grooves 212 correspond to and match the lower clamping column 801 of the needle tip sheath 8 one by one. The lower guide groove 212 is used to guide the position of the lower clamping column 1. The lower guide groove 212 includes a lower telescopic section 2121, a lower elastic arm 2122, and a lower rotating section 2123. The lower telescopic section 2121 extends along the axial direction of the needle seat 2 to provide guidance for the axial sliding of the lower clamping column 801. The lower elastic arm 2122 is arranged in the lower telescopic section 2121, and the front part of the corresponding opposite side of the lower telescopic section 2121 is surrounded by a lower starting area. The lower starting area serves as the initial fixed position of the lower clamping column 801. The lower elastic arm 2122 prevents the lower clamping column 801 that slides forward from the lower starting area from entering the starting area backward; the lower rotating section 2123 extends along the positive direction of the needle seat 2 and is connected with the tail part of the other side of the corresponding positive direction of the telescopic section 2121. The lower rotating section 2123 provides guidance for the positive sliding of the lower clamping column 801 and serves as the self-destructive fixed position of the lower clamping column 801.

[0168] like Fig.32 As shown, the rear end of the needle tube 4 cooperates with the needle tip sheath 8 to be telescopic to achieve shielding or exposure; after the self-destruction state is activated, under the action of the lower spring 7, the lower clamping column 801 goes along the lower telescopic section 2121, crosses the lower elastic arm 2122 and enters the lower rotating section 2123 of the needle seat 2.

[0169] Among them, a structure similar to the anti-return protrusion 20621 in Example 4 can be set on the side of the lower elastic arm 2122, so that the lower clamping column 801 is limited in the lower rotating section 2123 under the action of the protrusion. In this way, the needle tip sheath 8 with limited movement and rotation forms a barrier to the needle tip, achieving the purpose of safe self-destruction.

[0170] It should be noted that the fully described invention may also have a variety of variations and modifications, and is not limited to the specific embodiments described above. The above embodiments are merely illustrative of the invention, not limiting thereof. In short, the scope of protection of the invention should include those variations or substitutions and modifications that are obvious to a person of ordinary skill in the art.

Claims

1. Safety anti-needlestick self-destructive injection needle, characterized by: include: A needle cap is embedded in the front end of the needle seat, wherein the front end of the needle cap is provided with a through hole arranged along the axis, the inner side of the front end is provided with a first spring limiting structure, and the outer side wall is provided with a clamping column; The needle seat is provided with a second spring limiting structure and a needle tube fixing hole arranged along the axis, and a guide groove matched with the clamping column of the needle cap is provided on the side wall; A spring, located in the cavity formed by the inner cavity of the needle cap and the inner cavity of the needle seat, and having two ends respectively mounted on the first spring limiting structure and the second spring limiting structure; A needle tube is fixed in the needle tube fixing hole of the needle seat; and The needle cap rotation backstop structure prevents the needle cap from rotating in reverse when in the self-destruct state; Wherein, in the initial state, the needle cap extends forward, the clamping column of the needle cap is located at the initial fixed position of the guide groove of the needle seat, and the spring is compressed and twisted during assembly to provide the needle cap with a forward elastic force and a positive rotation torque. During use, the needle cap retracts due to external force, the clamping column of the needle cap slides backward along the guide groove of the needle seat, the front end of the needle tube extends out of the through hole of the needle cap, and the spring is further compressed. In the self-destruct state, the needle cap extends forward to cover the front end of the needle tube under the elastic force and torsion of the spring and rotates forwardly, and the clamping column of the needle cap slides to the self-destruct fixed position of the guide groove of the needle seat. At this time, the needle cap rotation check structure prevents the needle cap from rotating in the reverse direction.

2. The safety anti-needlestick self-destructive injection needle according to claim 1, characterized in that: The first spring limiting structure of the needle cap comprises: A truncated cone is coaxially arranged on the inner side of the front end of the needle cap, and the through hole is arranged on the truncated cone; A first guide surface is provided on the rear end surface of the truncated cone; and A first spring slot, disposed on the first guide surface; The front end of the spring is sleeved on the round table, and the front end of the spring is provided with a first hook formed by bending the end of the spring wire inward, and the first hook slides along the first guide surface and is clamped into the first spring groove.

3. The safety anti-needlestick self-destructive injection needle according to claim 2, characterized in that: The first guide surface is a curved surface extending along a spiral line around the axis of the truncated cone for less than or equal to one circle, and the first spring slot is arranged at the front end of the first guide surface.

4. The safety anti-needlestick self-destructive injection needle according to claim 1, characterized in that: The needle cap comprises: An end head, on which the through hole and the first spring limiting structure are provided; and The cap body is in the shape of a cylinder with two ends opened. The front end of the cap body is connected to the end head, and the clamping column is arranged on the outer side wall of the cap body.

5. The safety needle-proof self-destructive injection needle according to claim 1, characterized in that: The needle seat is in the shape of a cylinder with openings at both ends, and is provided with a transverse partition that divides the interior into two front and rear cavities. The front cavity of the needle seat is provided with a needle tube assembly base arranged along the axis and connected to the transverse partition, and the needle tube fixing hole and the second spring limiting structure are provided on the needle tube assembly base.

6. The safety anti-needlestick self-destructive injection needle according to claim 5, characterized in that: The second spring limiting structure of the needle seat comprises: An annular boss is provided on the rear end outer side wall of the needle tube assembly base and is connected to the diaphragm; a second guide surface, disposed on the front end surface of the annular boss; and A second spring slot, disposed on the second guide surface; The rear end of the spring is sleeved on the annular boss, and the rear end of the spring is provided with a second hook formed by bending the end of the spring wire inward, and the second hook slides along the second guide surface and is clamped into the second spring groove.

7. The safety needle-proof self-destructive injection needle according to claim 6, characterized in that: The second guide surface is an arc-shaped concave surface extending in the circumferential direction and concave toward the rear, and the second spring clamping groove is arranged at the lowest concave part of the second guide surface.

8. The safety needle-proof self-destructive injection needle according to claim 1, characterized in that: The torsion of the spring is generated by the circumferential angle between the ends of the spring wires at both ends being changed by the first spring limiting structure of the needle cap and the second spring limiting structure of the needle seat.

9. The safety needle-proof self-destructive injection needle according to claim 8, characterized in that: The circumferential angle between the ends of the spring wires at both ends of the spring is changed from 180° to 90° by the first spring limiting structure of the needle cap and the second spring limiting structure of the needle seat.

10. The safe needle-proof self-destructive injection needle according to any one of claims 1 to 9, characterized in that: The guide groove of the needle seat comprises: The telescopic section extends in the axial direction; An elastic arm is disposed in the telescopic section and surrounds a front portion of a side of the telescopic section in a corresponding opposite direction to form a starting area; and A rotating section extending in the positive direction and communicating with the front portion of the other side of the telescopic section corresponding to the positive direction; The starting area serves as the initial fixing position of the clamping column of the needle cap, the elastic arm prevents the clamping column that slides backward from the starting area from re-entering the starting area, and the rotating section serves as the self-destructing fixing position of the clamping column of the needle cap; A guide groove is provided on the inner side wall of the needle seat, the front end of the guide groove extends to the front end surface of the needle seat, and the rear end of the guide groove extends to the starting area. The guide groove guides the clamping column of the needle cap so that the clamping column is smoothly clamped into the starting area.

11. The safety needle-proof self-destructive injection needle according to claim 10, characterized in that: The needle cap rotation check structure comprises: a non-returning protrusion, arranged on the outer side wall of the needle cap; and A backstop block is arranged on the inner wall of the needle seat; Wherein, during the forward rotation of the needle cap, the anti-return protrusion passes over the anti-return block to form a lock buckle for preventing the needle cap from rotating in the reverse direction.

12. The safety anti-needlestick self-destructive injection needle according to claim 10, characterized in that: The safety needle-stick-proof self-destructive injection needle also includes: a sheath in a sleeve shape and sleeved on the outer side of the needle seat; The needle cap rotation check structure comprises: A non-return card slot, arranged on the outer side wall of the needle cap; An avoidance groove is provided on the outer side wall of the needle seat; and The backstop elastic arm is arranged on the side wall of the sleeve and is inclined toward the axial direction relative to the inner side wall of the sleeve; Wherein, in the initial state, the non-return card slot and the non-return elastic arm are staggered in the circumferential direction, the non-return elastic arm is located in the avoidance groove and the front end is against the outer wall of the needle cap. In the self-destruction state, the anti-return elastic arm corresponds to and is clamped into the anti-return clamping groove in the circumferential direction, forming a lock buckle for preventing the needle cap from rotating in the reverse direction.

13. The safety needle-proof self-destructive injection needle according to claim 12, characterized in that: An axially extending convex rib is provided on the outer side wall of the needle seat, and an axially extending groove is provided on the inner side wall of the sheath. The needle seat and the sheath are tightly assembled by the cooperation of the convex rib and the groove.

14. The safe needle-proof self-destructive injection needle according to any one of claims 11 to 13, characterized in that: In the initial state, the needle cap extends forward to cover the front end of the needle tube.

15. The safe needle-proof self-destructive injection needle according to any one of claims 11 to 13, characterized in that: In the initial state, the front end of the needle tube is exposed through the through hole of the needle cap.

16. The safe needle-proof self-destructive injection needle according to any one of claims 1 to 9, characterized in that: The guide groove of the needle seat comprises: The telescopic section extends in the axial direction; The snap-in section is connected to the front part of the telescopic section in the opposite direction, and the front end of the snap-in section extends to the front end surface of the needle seat so as to allow the clamping column of the needle cap to be snapped in; The starting section is connected to the rear portion of the other side of the telescopic section corresponding to the positive direction; a rotating section connected to the front portion of the other side of the telescopic section corresponding to the positive direction; and An elastic arm blocks the front end of the telescopic section, and the suspended end of the elastic arm extends into the clipping section, so that a through opening with a width smaller than that of the clipping column is formed in the clipping section; The starting section serves as an initial fixing position of the clamping column of the needle cap, and the rotating section serves as a self-destructing fixing position of the clamping column of the needle cap.

17. The safety needle-proof self-destructive injection needle according to claim 16, characterized in that: The needle cap rotation check structure comprises: A latching tooth is disposed on a side surface of the latching column of the needle cap; and An inverted latching tooth is disposed in the rotating section; Wherein, when the needle cap rotates forward and the clamping column of the needle cap slides along the rotating section, the clamping tooth passes over the reverse clamping tooth to form a lock buckle for preventing the needle cap from rotating in the reverse direction.

18. The safety needle-proof self-destructive injection needle according to claim 16, characterized in that: The needle cap rotation check structure comprises: An end plane is disposed on the rear side of the clamping column side of the needle cap; and A non-return protrusion is arranged on the elastic arm, and the non-return protrusion makes the connection between the telescopic section and the rotating section form a bayonet with a width smaller than that of the end plane; Wherein, in the self-destruction state, the clamping column of the needle cap is blocked by the anti-return protrusion and the end plane is blocked by the clamping hole and is limited in the rotating section, forming a lock to prevent the needle cap from rotating in the reverse direction.

19. The safety needle-proof self-destructive injection needle according to claim 18, characterized in that: The safe needle-proof self-destructive injection needle also includes: a sheath in the shape of a sleeve and sleeved on the outer side of the needle seat; and An outer protective sleeve is sleeved on the outside of the sheath.

20. The safety needle-proof self-destructive injection needle according to any one of claims 1 to 9, characterized in that: The safety anti-needle puncture self-destructive injection needle also includes A lower spring is located in the inner cavity of the needle seat and below the spring; The needle tip sheath is located below the lower spring and embedded in the tail end of the needle seat, and a lower clamping column is provided on the outer side wall; Wherein, in the initial state, the needle tip shield retreats, the lower clamping column is located at the initial fixed position of the lower guide groove of the needle seat, and the lower spring is compressed and twisted during assembly to provide the needle tip shield with a backward elastic force and a forward rotation torque. During use, the needle tip shield is pressed forward by an external force, and the lower clamping column slides forward along the lower guide groove. In the self-destruction state, the needle tip shield retreats to cover the tail end of the needle tube under the elastic force and torsion of the lower spring and rotates forward, and the lower clamping column slides to the self-destruction fixed position of the lower guide groove.

21. The safety needle-proof self-destructive injection needle according to claim 20, characterized in that: The lower guide groove comprises: A lower telescopic section extending in the axial direction; A lower elastic arm is disposed in the lower telescopic section and surrounds a tail portion of a corresponding opposite side of the lower telescopic section to form a lower starting area; and A lower rotating section extending in the positive direction and communicating with the tail portion of the lower telescopic section on the other side corresponding to the positive direction; The lower starting area serves as the initial fixing position of the lower clamping column, the lower elastic arm prevents the lower clamping column that slides forward from the lower starting area from re-entering the lower starting area, and the lower rotating section serves as the self-destructing fixing position of the lower clamping column.

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