CN113456947A

CN113456947A - Safety anti-acupuncture self-destruction syringe needle

Info

Publication number: CN113456947A
Application number: CN202110839059.XA
Authority: CN
Inventors: 张洪杰
Original assignee: Beipu Medical Technology Co ltd
Current assignee: Beipu Medical Technology Co ltd
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2021-10-01
Also published as: WO2023001260A1

Abstract

A safe anti-acupuncture self-destruction syringe needle comprises a needle cap, a needle base, a spring, a needle tube and a needle cap rotation non-return structure. The needle cap is provided with a first spring limiting structure and a clamping column, the needle base is correspondingly provided with a second spring limiting structure and a guide groove, two ends of the spring are respectively arranged on the first spring limiting structure and the second spring limiting structure, and forward elasticity and forward rotation torsion are automatically formed to provide the needle cap with the forward elasticity in the assembling process. In the initial state, the clamping column is positioned at the initial fixed position of the guide groove; in the using process, the needle cap and the clamping column move backwards, and the needle tube extends out; in the self-destruction process, the needle cap extends out to cover the needle tube, the needle cap rotates forwards, the needle cap rotation check structure is effective, and the needle cap is prevented from rotating reversely. The whole product has the advantages of stable structure, simple process and high economic benefit, realizes automatic self-destruction, has stable and effective integral structure in a self-destruction state, has good shielding and protecting effects on the double-end needle point of the needle tube, and improves the safety.

Description

Safety anti-acupuncture self-destruction syringe needle

Technical Field

The invention belongs to the technical field of injectors, and particularly relates to an injection needle.

Background

Pen-type injection devices, such as insulin pens and injection needles, have been widely used as a method for treating diabetes. Wherein, the insulin pen carries the liquid medicine of insulin of the prescribed quantity, can be repeatedly used, and the syringe needle is a disposable syringe needle with safety protection device.

The Chinese patent publication No. CN10449195B discloses a safety insulin pen needle, which has the advantages that during the insulin injection process, a protector is triggered, and after the injection is finished, the tip of the needle is instantly protected, so that the injury of the needle tip to doctors or patients can be prevented.

However, the safety insulin pen needle of the above type has some defects of unstable structure, and when the user uses the insulin pen needle correctly according to the regulations, the automatic protection of the needle head by the trigger protector is effective. However, some users have a habit of rotating the insulin pen needle when pulling out the needle after the insulin injection is completed, and in this process, the structure is unstable, and the reliability of the trigger device is low, so that the automatic protection function of the trigger protector for the needle head is probably disabled due to the rotation action. Due to the situation that the automatic protection of the needle head is disabled by rotating the insulin pen needle when the needle is pulled out, there is a need for an improvement of the insulin pen needle to prevent the risk of the automatic protection failure.

In addition, most of the products on the market have various accessories, complex process and low economic benefit, and an injection needle with stable structure, simple process and high economic benefit needs to be developed at present.

Disclosure of Invention

The invention aims at the problems and provides a safe and anti-needle-prick self-destruction syringe needle.

The purpose of the invention can be realized by the following technical scheme:

safe puncture-proof self-destruction syringe needle includes:

the needle cap is embedded at the front end of the needle base, 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 base is internally provided with a second spring limiting structure and a needle tube fixing hole arranged along the axis, and the side wall of the needle base is provided with a guide groove matched with the clamping column of the needle cap;

the spring is positioned in a cavity formed by the inner cavity of the needle cap and the inner cavity of the needle base, and two ends of the spring are respectively arranged on the first spring limiting structure and the second spring limiting structure;

the needle tube is fixed in the needle tube fixing hole of the needle seat; and

the needle cap rotation non-return structure plays a role in preventing the needle cap from reversely rotating in a self-destruction state.

Wherein, in the initial state, the needle cap is extended forwards, the clamping column of the needle cap is positioned at the initial fixed position of the guide groove of the needle seat, and the spring is compressed and twisted to provide forward elastic force and forward rotating torsion force for the needle cap when being assembled.

In the using process, the needle cap retracts due to external force, the clamping column of the needle cap slides backwards along the guide groove of the needle base, the front end of the needle tube extends out of the through hole of the needle cap, and the spring is further compressed.

When the needle cap is in a self-destruction state, the needle cap extends forwards under the action of the elasticity and the torsion of the spring to cover the front end of the needle tube and rotates forwards, the clamping column of the needle cap slides to the self-destruction fixed position of the guide groove of the needle seat, and at the moment, the needle cap rotation non-return structure prevents the needle cap from rotating backwards.

Preferably, the first spring limiting structure of the needle cap comprises: the circular truncated cone is coaxially arranged on the inner side of the front end of the needle cap, and a through hole is formed in the circular truncated cone; the first guide surface is arranged on the rear end surface of the circular truncated cone; and the first spring clamping groove is arranged on the first guide surface. The front end of the spring is sleeved on the circular truncated cone, the front end of the spring is provided with a first clamping hook formed by inwards bending the tail end of the spring wire, and the first clamping hook slides along the first guide surface and is clamped into the first spring clamping groove. In some embodiments, the first guide surface is a curved surface extending along a spiral line around the axis of the circular truncated cone by less than or equal to one turn, and the first spring clamping groove is arranged at the front end of the first guide surface.

Preferably, the needle cap adopts a split structure, comprising: the end socket is provided with a through hole and a first spring limiting structure; the cap body is cylindrical with openings at two ends, the front end of the cap body is connected with the end head, and the outer side wall of the cap body is provided with a clamping column.

Preferably, the needle seat is cylindrical with openings at two ends, a transverse partition plate which divides the interior into a front cavity and a rear cavity is arranged in the needle seat, a needle tube assembly base which is arranged along an axis and connected with the transverse partition plate is arranged in the front cavity of the needle seat, and a needle tube fixing hole and a second spring limiting structure are arranged on the needle tube assembly base.

Preferably, the second spring limiting structure of the needle seat comprises: the annular boss is arranged on the outer side wall of the rear end of the needle tube assembly base and is connected with the diaphragm plate; the second guide surface is arranged on the front end surface of the annular boss; and the second spring clamping groove is arranged on the second guide surface. The rear end of the spring is sleeved on the annular boss, the rear end of the spring is provided with a second clamping hook formed by inwards bending the tail end of the spring wire, and the second clamping hook slides along the second guide surface and is clamped into a second spring clamping groove. In some embodiments, the second guide surface is an arc-shaped concave surface extending along the circumferential direction and recessed towards the rear, and the second spring clamping groove is arranged at the lowest recessed position of the second guide surface.

Preferably, the torsion of the spring is generated by changing a circumferential included angle between the tail ends of the spring wires at two ends 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 stop structure of the needle cap and the second spring stop structure of the needle hub.

The guide groove of the needle base and the needle cap rotation non-return structure are respectively designed with a plurality of structures.

Preferably, the guide groove of the needle holder includes: a telescopic section extending in the axial direction; the elastic arm is arranged in the telescopic section and surrounds the front part of one side of the telescopic section, which corresponds to the reverse direction, into an initial area; and the rotating section extends along the positive direction and is communicated with the front part of the other side of the telescopic section corresponding to the positive direction. Wherein, the initial area is used as the initial fixing position of the clamping column of the needle cap, and the needle cap can extend forwards to cover the front end of the needle tube in the initial state; the elastic arm prevents the clamping column which slides out backwards from the starting area from entering the starting area again; the rotating section is used as the self-destruction fixing position of the clamping column of the needle cap. In addition, be equipped with the guide way on the inside wall of needle file, the front end of guide way extends to on the preceding terminal surface of needle file, and the rear end of guide way extends to initial region, and the guide way leads to the card post direction of needle cap, makes the card post block smoothly in initial region.

In some examples implemented on the basis of the guide groove of the needle holder, the needle cap rotation check structure includes: the non-return lug is arranged on the outer side wall of the needle cap; and the non-return stop block is arranged on the inner side wall of the needle seat. Wherein, in the process of the forward rotation of the needle cap, the non-return convex block goes over the non-return stop block to form a lock catch for preventing the reverse rotation of the needle cap.

In other examples implemented on the basis of the guiding groove of the needle seat, the safety needle-stick-proof self-destruction injection needle further comprises: the sheath is in a sleeve shape and is sleeved outside the needle seat. The needle cap rotation contrary structure that ends includes: the non-return clamping groove is arranged on the outer side wall of the needle cap; the avoidance groove is arranged on the outer side wall of the needle seat; and a non-return elastic arm which is arranged on the side wall of the sheath and inclines towards the axis direction relative to the inner side wall of the sheath. When the needle cap is in an initial state, the non-return clamping groove and the non-return elastic arm are staggered in the circumferential direction, the non-return elastic arm is positioned in the avoiding groove, and the front end of the non-return elastic arm abuts against the outer side wall of the needle cap; when in a self-destruction state, the non-return elastic arms are corresponding in the circumferential direction and clamped into the non-return clamping grooves to form a lock catch for preventing the needle cap from rotating reversely. In addition, the outer side wall of the needle seat can be provided with a convex rib extending axially, the inner side wall of the sheath can be provided with a groove extending axially, and the needle seat and the sheath are matched with each other through the convex rib and the groove to realize tight assembly.

Preferably, the guide groove of the needle holder includes: a telescopic section extending in the axial direction; the clamping section is communicated with the front part of one corresponding reverse side of the telescopic section, and the front end of the clamping section extends to the front end surface of the needle seat so as to clamp the clamping column of the needle cap; the starting section is communicated with the rear part of the other side of the telescopic section in the forward direction; the rotating section is communicated with the front part of the other side of the telescopic section in the corresponding positive direction; and the elastic arm blocks the front end of the telescopic section, and the suspended end of the elastic arm extends into the clamping section to form a through opening with the width smaller than that of the clamping column in the clamping section. The starting section is used as an initial fixing position of the clamping column of the needle cap, and the front end of the needle tube can also penetrate through the through hole of the needle cap to expose one section in the initial state; the rotating section is used as the self-destruction fixing position of the clamping column of the needle cap.

In some examples implemented on the basis of the guide groove of the needle holder, the needle cap rotation check structure includes: the latch is arranged on the side surface of the clamping column of the needle cap; and the inverted latch is arranged in the rotating section. Wherein, take place forward rotation at the needle cap to the card post of needle cap is along the gliding in-process of rotatory section, and the latch is crossed the latch of falling, constitutes the hasp that prevents needle cap reverse rotation.

In other examples implemented on the basis of the guide groove of the needle holder, the needle cap rotation check structure includes: an end plane arranged at the rear side of the side surface of the clamping column of the needle cap; and the non-return bulge is arranged on the elastic arm, and the non-return bulge enables the communication part of the telescopic section and the rotating section to form a bayonet with the width smaller than that of the end plane. When the needle cap is in a self-destruction state, the clamping column of the needle cap is blocked by the non-return bulge and the end plane is blocked by the bayonet to be limited in the rotating section, so that the lock catch for preventing the needle cap from reversely rotating is formed.

In addition, the safety needle-prick prevention self-destruction syringe needle can also comprise: the sheath is in a sleeve shape and is sleeved outside the needle seat; and the outer protective sleeve is sleeved outside the protective sleeve and used for integrally protecting the injection needle.

The safety puncture-preventing self-destruction syringe needle also comprises a lower spring which is positioned in the inner cavity of the needle seat and below the spring; the needle tip sheath is positioned below the lower spring and embedded at the tail end of the needle base, and a lower clamping column is arranged on the outer side wall; the needle seat rotation non-return structure plays a role in preventing the needle tip sheath from reversely rotating in a self-destruction state;

when the needle is in an initial state, the needle point sheath retreats, the lower clamping column is located at the initial fixing position of the lower guide groove of the needle seat, and the lower spring is compressed and twisted to provide backward elastic force and forward rotating torsion force to the needle point sheath when being assembled.

In the using process, the needle point protective cover is pressed forwards by external force, and the lower clamping column slides forwards along the lower guide groove.

When the needle tube is in a self-destruction state, the needle tip protective sleeve retreats under the action of the elasticity and the torsion of the lower spring to cover the tail end of the needle tube and rotates in the positive direction, and the lower clamping column slides to the self-destruction fixed position of the lower guide groove.

Preferably, the lower guide groove includes: a lower telescopic section extending in the axial direction; the lower elastic arm is arranged in the lower telescopic section and surrounds the tail part of one side of the lower telescopic section, which corresponds to the reverse direction, into a lower starting area; the lower rotating section extends along the positive direction and is communicated with the tail part of the other side, corresponding to the positive direction, of the lower telescopic section;

the lower starting area is used as an initial fixing position of the lower clamping column, the lower elastic arm prevents the lower clamping column which slides forwards from the lower starting area from entering the lower starting area again, and the lower rotating section is used as a self-destruction fixing position of the lower clamping column.

Compared with the prior art, the invention has the beneficial effects that: the needle cap is provided with a first spring limiting structure and a clamping column, the needle base is correspondingly provided with a second spring limiting structure and a guide groove, two ends of a spring are respectively arranged on the first spring limiting structure and the second spring limiting structure, forward elasticity and forward rotation torsion are automatically formed to provide the needle cap with the forward elasticity in the assembling process, and a needle cap rotation check structure is further arranged. Wherein, the guide groove of the needle base and the needle cap rotation non-return structure are respectively designed with a plurality of structures.

In the initial state, the clamping column of the needle cap is positioned at the initial fixed position of the guide groove of the needle seat; during the injection use process, the needle cap passively retracts towards the needle base, the clamping column of the needle cap slides backwards along the guiding groove of the needle base, 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-destruction process, the needle cap extends out under the action of the axial elasticity of the spring to cover the needle tube, the needle cap rotates forwards under the action of the forward torsion of the spring, and the needle cap rotation non-return structure takes effect to play a role in preventing the needle cap from rotating backwards; in addition, the tail end of the needle tube is also provided with a shielding structure which is symmetrical with the front end of the needle tube.

The whole product has the advantages of stable structure, simple process and high economic benefit, realizes automatic self-destruction, has stable and effective integral structure in a self-destruction state, has good shielding and protecting effects on the double-end needle point of the needle tube, and improves the safety.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 in an initial state;

FIG. 2 is a sectional view of embodiment 1 in an initial state;

FIG. 3 is an exploded view schematically showing the structure of example 1;

FIG. 4 is a schematic structural view of a needle cap in example 1;

fig. 5 is a schematic structural view of a needle holder in embodiment 1;

fig. 6 is another structural schematic view of the needle holder in embodiment 1;

FIG. 7 is a schematic diagram showing a top view and a perspective view of a spring according to embodiment 1;

FIG. 8 is a schematic view showing a change before and after assembling of the spring with the needle cap and the needle holder in example 1;

FIG. 9 is a schematic view showing a change from an initial state to a self-destruction state in embodiment 1;

FIG. 10 is a sectional view showing a self-destruction state of example 1;

fig. 11 is a perspective view of the needle cap in the self-destruction state with the non-return projection of the needle cap engaged with the non-return stop of the needle holder in embodiment 1;

fig. 12 is a top view of the needle cap in the self-destruction state with the check projection of the needle cap engaged with the check stop of the needle holder in embodiment 1;

FIG. 13 is a sectional view showing the initial state of embodiment 2;

FIG. 14 is an exploded view of the needle cap and the needle holder and the sheath in embodiment 2;

FIG. 15 is an exploded view of the needle cap and the sheath in example 2;

FIG. 16 is a schematic view showing the internal structure of the sheath according to example 2;

FIG. 17 is a schematic view showing a transition of embodiment 2 from an initial state to a self-destruction state;

fig. 18 is a schematic structural view of the needle cap in the self-destruction state in which the check neck is engaged with the check resilient arm of the sheath in embodiment 2;

FIG. 19 is a schematic structural view in an initial state of embodiment 3;

FIG. 20 is a schematic structural view of a needle cap in embodiment 3;

fig. 21 is a schematic structural view of a needle holder in embodiment 3;

FIG. 22 is a schematic view showing a transition of embodiment 3 from an initial state to a self-destruction state;

FIG. 23 is a schematic view showing the structure of example 3 in which a sheath and an outer protective sheath are assembled;

FIG. 24 is a schematic structural view in an initial state of embodiment 4;

fig. 25 is an exploded view schematically showing the needle cap and the needle holder in embodiment 4;

FIG. 26 is a schematic view showing a transition of embodiment 4 from an initial state to a self-destruction state;

FIG. 27 is a schematic view showing the structure of the sheath and the outer protective sheath according to example 4;

FIG. 28 is a view showing the structure of the needle holder of example 5 assembled with the lower spring and the needle tip protector;

FIG. 29 is an exploded view of the needle holder, the lower spring and the needle tip protector according to example 5;

FIG. 30 is a schematic structural view in an initial state of example 5;

FIG. 31 is a schematic structural view of the self-destruction state in accordance with embodiment 5;

FIG. 32 is a schematic view showing the structure of the needle tip sheath and the needle cannula in the self-destruction state according to embodiment 5.

The reference numbers are as follows:

1 needle cap

101 through hole

102 round table

103 first guide surface

104 first spring catch groove

105 clamping column

1051 latch

1052 end plane

106 non-return lug

1061 first inclined plane

107 terminal

108 cap body

109 non-return clamping groove

2 needle seat

201 diaphragm plate

202 needle tube assembling base

203 annular boss

204 second guide surface

205 second spring catch

206 guide groove

2061 expansion segment

2062 elastic arm

20621 non-return bulge

2063 rotating segment

2064 into segments

2065 beginning segment

207 guide groove

208 backstop block

2081 second inclined plane

209 avoiding groove

210 convex rib

211 inverse latch tooth

212 lower guide groove

2121 lower telescopic segment

2122 lower elastic arm

2123 lower rotary segment

3 spring

301 first hook

302 second hook

4 needle tube

5 protective cover

501 non-return elastic arm

502 groove

6 outer protective sleeve

7 lower spring

8 needle point sheath

801 lower the clamping column.

Detailed Description

The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the invention has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive, of the scope of the invention.

Example 1

Referring to fig. 1 to 3, the safe and puncture-proof self-destruction syringe needle comprises a needle cap 1, a needle base 2, a spring 3, a needle tube 4 and a needle cap rotation check structure. The needle cap 1 is embedded at the front end of the needle base 2. The spring 3 is positioned in a cavity formed by the inner cavity of the needle cap 1 and the inner cavity of the needle base 2, two ends of the spring are respectively installed in the needle cap 1 and the needle base 2, the spring 3 is compressed and twisted when being assembled with the needle cap 1 and the needle base 2, the spring provides elastic force moving forwards along the axial direction and torsion rotating forwards along the circumferential direction for the needle cap 1, and the needle cap 1 can extend forwards and rotate forwards when an injection needle head is self-destructed. The needle tube 4 is fixed in the needle base 2, and the front end of the needle tube 4 is matched with the needle cap 1 to stretch and retract so as to be shielded or exposed. The needle cap rotation non-return structure plays a role in preventing the needle cap 1 from reversely rotating when the injection needle is in a self-destruction state. The "forward direction" is a description relative to the "reverse direction" and may be a clockwise direction or a counterclockwise direction. See below for a detailed description.

Referring to fig. 4, the needle cap 1 is in a sleeve shape, and the front end of the needle cap 1 is provided with a through hole 101 arranged along the axis for the front end of the needle tube 4 to pass through the needle cap 1.

The inner side of the front end 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 circular truncated cone 102, a first guide surface 103, and a first spring slot 104. The round platform 102 is sleeved with the front end of the spring 3, the round platform 102 is arranged on the inner side of the front end of the needle cap 1 and is coaxial with the needle cap 1, and the round platform 102 is provided with the through hole 101; the first guide surface 103 is used for guiding the first hook 301 at the front end of the spring 3, so that the first hook 301 is smoothly clamped into the first spring clamping groove 104, the first guide surface 103 is arranged on the rear end surface of the circular truncated cone 102 and is a curved surface which extends along a spiral line around the axis of the circular truncated cone 102 by less than or equal to one circle, and the curved surface is a half circle shown in the figure; the first spring engaging groove 104 is used for engaging a first hook 301 of the spring 3, the first spring engaging groove 104 is disposed on the first guiding surface 103, and the first spring engaging groove 104 shown in the figure is disposed at the front end of the first guiding surface 103.

More than one clamping column 105 and more than one non-return lug 106 are arranged on the outer side wall of the needle cap 1, and more than two clamping columns 105 and more than two non-return lugs 106 can be respectively and uniformly distributed on the outer side wall of the needle cap 1 along the circumferential direction.

In addition, the needle cap 1 can be a combined structure so as to facilitate the processing of the first spring limiting structure. In this embodiment, the needle cap 1 is formed by connecting a tip 107 and a cap body 108, the tip 107 is provided with a through hole 101 and a first spring limiting structure, the cap body 108 is cylindrical with openings at two ends, the front end of the cap body 108 is connected with the tip 107 through interference fit, and the outer side wall of the rear end of the cap body 108 is provided with a clamping column 105 and a non-return bump 106.

Referring to fig. 5 and 6, the needle holder 2 is cylindrical with openings at both ends, a diaphragm 201 connected into a whole is arranged in the needle holder 2, and the inside of the needle holder 2 is divided into a front cavity and a rear cavity by the diaphragm 201. A columnar needle tube assembly base 202 which is connected with the diaphragm plate 201 into a whole and is coaxial with the needle base 2 is arranged in the front cavity of the needle base 2, a needle tube fixing hole which is through along the axial line is arranged on the needle tube assembly base 202, and a needle tube 4 can be fixed in the needle tube assembly base through environment-friendly quick-drying glue, and the needle tube assembly base is shown in figure 2. The needle cap 1 and the spring 3 are arranged in the front cavity of the needle stand 2, which will be emphasized below. The back cavity of the needle base 2 is used for being connected with the needle cylinder, and a thread or an embedding opening used for being connected with the needle cylinder is arranged in the back cavity.

The needle tube assembly base 202 is provided with a second spring limiting structure for mounting 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 slot 205. The annular boss 203 is sleeved with the rear end of the spring 3, and the annular boss 203 protrudes from the outer side wall of the rear end of the needle tube assembly base 202 along the circumferential direction and is connected with the diaphragm plate 201 into a whole; the second guide surface 204 is used for guiding the second hook 302 at the rear end of the spring 3, so that the second hook 302 can be smoothly clamped into the second spring clamping 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, the arc-shaped concave surfaces are uniformly distributed along the circumferential direction of the annular boss 203, and each arc-shaped concave surface extends along the circumferential direction and is recessed towards the rear; the second spring engaging groove 205 is used for engaging a second engaging hook 302 of the spring 3, and a second spring engaging groove 205 is disposed on each of the curved concave surfaces, and preferably, a second spring engaging groove 205 is disposed at the lowest recessed position of each of the curved concave surfaces.

The side wall of the front cavity of the needle base 2 corresponding to the front cavity is provided with more than one guiding groove 206, the more than two guiding grooves 206 can be uniformly distributed on the side wall of the needle base 2 along the circumferential direction, the guiding grooves 206 correspond to and cooperate with the clamping columns 105 of the needle cap 1 one by one, and the guiding grooves 206 are used for guiding the positions of the clamping columns 105. In this embodiment, each guide slot 206 includes a telescoping section 2061, a resilient arm 2062, and a rotating section 2063. The telescopic section 2061 extends along the axial direction of the needle base 2 and provides a guide for the axial sliding of the clamping column 105; the elastic arm 2062 is arranged in the telescopic section 2061, and encloses a starting area at the front part of the telescopic section 2061 at the opposite side, the starting area is used as the initial fixing position of the clamping column 105, and the elastic arm 2062 prevents the clamping column 105 sliding out from the starting area backwards from entering the starting area forwards again; the rotating section 2063 extends along the forward direction of the needle base 2 and is communicated with the front part of the other side of the telescopic section 2061 corresponding to the forward direction, and the rotating section 2063 provides a guide for the forward sliding of the clamping column 105 and serves as a self-destruction fixing position of the clamping column 105.

The front end of the inner side wall of the front cavity of the needle seat 2 is provided with more than one guide groove 207 and more than one non-return stop 208, and the more than two guide grooves 207 and the more than two non-return lugs 106 can be uniformly distributed on the inner side wall of the needle seat 2 along the circumferential direction. The guide groove 207 extends in the axial direction of the needle holder 2, the front end extends to the front end surface of the needle holder 2, the rear end extends to the initial region in the telescopic section 2061 of the guide groove 206, and the guide groove 207 is used for guiding the clamping column 105 when the needle cap 1 is installed, so that the clamping column 105 is clamped in the initial region in the telescopic section 2061 of the guide groove 206 through interference of the guide groove 207. The non-return block 208 and the non-return convex block 106 of the needle cap 1 form the non-return structure of the needle cap in this embodiment, the non-return convex block 106 and the non-return block 208 are respectively provided with a first inclined surface 1061 and a second inclined surface 2081, as shown in the enlarged partial view of fig. 12, when the needle cap 1 rotates forward relative to the needle base 2, the non-return convex block 106 can smoothly pass over the non-return block 208 through the contact and cooperation of the first inclined surface 1061 and the second inclined surface 2081, and then if the needle cap 1 rotates reversely, the non-return convex block 106 is blocked by the non-return block 208, and the needle cap 1 cannot rotate reversely.

Referring to fig. 7, the spring 3 is a coil spring. The front end of the spring 3 is matched 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 circular truncated cone 102 of the needle cap 1, the tail end of the spring wire at the front end of the spring 3 is bent inwards to form a first hook 301, and the first hook 301 is clamped into the first spring clamping groove 104 along the first guide surface 103 of the needle cap 1 in a sliding manner. The rear end of the spring 3 is matched with the second spring limiting structure of the needle holder 2, in this embodiment, the rear end of the spring 3 is sleeved on the annular boss 203 of the needle holder 2, the tail end of the spring wire at the rear end of the spring 3 is bent inwards to form a second hook 302, and the second hook 302 slides along the second guide surface 204 of the needle holder 2 and is clamped into the second spring clamping groove 205.

It should be noted that, after the needle cap 1, the needle base 2 and the spring 3 are assembled, the spring 3 is in a compressed state, and a circumferential included angle between the first hook 301 and the second hook 302 of the spring 3 is changed compared with that before the assembly, so that a torque is formed. In this embodiment, referring to fig. 7 and 8, the circumferential included angle between the first hook 301 and the second hook 302 of the spring 3 before assembly is 180 °, the circumferential included angle between the first hook 301 and the second hook 302 of the spring 3 after assembly is 90 °, and the circumferential included angle is matched with the circumferential included angle between the first spring clamping groove 104 of the needle cap 1 and the second spring clamping groove 205 of the needle holder 2. The arrangement enables the spring 3 to automatically form torque in the assembling process, simplifies the assembling process and improves the assembling efficiency.

In the initial state of the present injection needle, see the left part of fig. 9, the needle cap 1 covers the front end of the needle tube 4, the locking pin 105 of the needle cap 1 is located at the initial region in the telescopic section 2061 of the guiding groove 206 of the needle holder 2, and the spring 3 is in the compressed and twisted state.

When the injection needle is used for injection, as shown in the middle part of fig. 9, the needle cap 1 abutting against a part to be injected is retracted into the needle base 2 under the reaction force, during the retraction of the needle cap 1, the clamping column 105 of the needle cap 1 slides backwards from the initial region in the telescopic section 2061 of the guide groove 206 of the needle base 2, when the clamping column 105 of the needle cap 1 passes through the elastic arm 2062, the elastic arm 2062 is elastically deformed and restored, after the clamping column 105 of the needle cap 1 passes over the elastic arm 2062, the clamping column 105 of the needle cap 1 can not enter the initial region in the telescopic section 2061 of the guide groove 206 any more, and the spring 3 is further compressed.

After the injection needle is pulled out, the injection needle is self-destructed, as shown in the right part of fig. 9, under the action of the elastic force of the spring 3, the clamping column 105 of the needle cap 1 slides forwards to the front end along the part outside the initial area in the telescopic section 2061 of the guide groove 206 of the needle stand 2, and the needle cap 1 extends out and covers the front end of the needle tube 4. Then, under the action of 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 base 2 and slides to the other end along one end of the rotating section 2063, and the needle cap 1 rotates positively, in the process, the needle cap rotation check structure is effective, specifically, the check convex block 106 of the needle cap 1 smoothly passes over the check stop 208 through the matching of the first inclined surface 1061 and the second inclined surface 2081 of the check stop 208, so as to form a lock catch for preventing the needle cap 1 from rotating reversely.

Finally, referring to fig. 10, the self-destruction state of the injection needle head, the front end of the needle tube 4 is hidden in the needle cap 1 and is shielded by the needle cap 1. At this time, referring to fig. 11 and 12, the check protrusion 106 of the needle cap 1 and the check stopper 208 of the needle base 2 cooperate to form a lock catch for preventing the needle cap 1 from rotating reversely, if the needle cap 1 rotates reversely, the check protrusion 106 is blocked by the check stopper 208, so that the whole structure of the needle cap 1 covering the front end of the needle tube 4 is ensured to be stable, the needle cap 1 is effectively prevented from rotating reversely under the action of the force insufficient to damage the lock catch, and the automatic protection failure caused by the fact that the clamping column 105 of the needle cap 1 returns to the telescopic section 2061 of the guide groove 206 of the needle base 2 is avoided.

Example 2

Referring to fig. 13 and 14, the safety needle-stick-proof self-destruction injection needle comprises a needle cap 1, a needle base 2, a spring 3, a needle tube 4 and a needle cap rotation non-return structure. The difference from the embodiment 1 is that a sheath (also called a middle sleeve or a clamping piece) 5 is added, and a needle cap rotation non-return structure is designed again.

Referring to fig. 14 and 15, the needle cap 1 is eliminated from the check projection 106 of embodiment 1. Redesigned, more than one non-return clamping grooves 109 are formed in the outer side wall of the needle cap 1, the more than two non-return clamping grooves 109 can be uniformly distributed on the outer side wall of the needle cap 1 along the circumferential direction, and the non-return clamping grooves 109 are used for being matched with the non-return elastic arms 501 of the sheath 5 to play a role in preventing the needle cap 1 from reversely rotating.

The non-return stop 208 of embodiment 1 is eliminated from the needle holder 2. Redesigned, more than one avoiding groove 209 is arranged at the front end of the outer side wall of the needle base 2, the more than two avoiding grooves 209 can be uniformly distributed on the outer side wall of the needle base 2 along the circumferential direction, and the avoiding grooves 209 are used for avoiding the non-return elastic arms 501 of the sheath 5. In addition, the back part of the outer side wall of the needle base 2 is provided with more than one axially extending convex rib 210, the more than two convex ribs 210 can be uniformly distributed on the outer side wall of the needle base 2 along the circumferential direction, and the convex ribs 210 are used for being matched with the groove 502 of the sheath 5 to realize the tight assembly between the needle base 2 and the sheath 5.

The sheath 5 is the newly-added part of this embodiment, and sheath 5 is the sleeve form of both ends open-ended, and sheath 5 overlaps the outside at needle file 2. The difference with the common sheath in the field is that the front part of the side wall of the sheath 5 is provided with more than one non-return elastic arm 501, the more than two non-return elastic arms 501 can be uniformly distributed on the side wall of the sheath 5 along the circumferential direction, each non-return elastic arm 501 is inclined towards the axial direction relative to the inner side wall of the sheath 5, and the non-return elastic arms 501 are used for being clamped in the non-return clamping grooves 109 of the needle cap 1 to prevent the needle cap 1 from reversely rotating. In addition, more than one axially extending groove 502 is arranged at the rear part of the inner side wall of the sheath 5, see fig. 16, more than two grooves 502 can be uniformly distributed on the inner side wall of the sheath 5 along the circumferential direction, and the sheath 5 is matched with the convex rib 210 of the needle seat 2 through the grooves 502 to realize the tight assembly with the needle seat 2.

Preferably, there are two contrary draw-in grooves 109 that stop along the circumference equipartition on the lateral wall of needle cap 1, and the lateral wall front end of needle file 2 has two along the circumference equipartition and dodges the groove 209, and the lateral wall rear portion of needle file 2 has four protruding muscle 210 along the circumference equipartition, and the lateral wall front portion of sheath 5 has four contrary elastic arm 501 that stop along the circumference equipartition, and the inside wall rear portion of sheath 5 has four recesses 502 along the circumference equipartition. The operation of the safety needle-stick-proof self-destructive injection needle is described in this preferred embodiment, which is described in detail below.

The needle cap 1, the needle base 2, the spring 3 and the needle tube 4 are explained with reference to embodiment 1 in the initial state of the injection needle, as shown in the left part of fig. 17. The difference is that two non-return elastic arms 501 (see the non-return elastic arms marked on the left part of fig. 17) of the sheath 5 respectively correspond to the two non-return clamping grooves 109 of the needle cap 1 in the circumferential direction, but are separated from the two non-return clamping grooves 109 of the needle cap 1 due to obvious elastic deformation caused by being blocked by the front part of the side wall of the needle holder 2; the other two resilient arms (not shown in the left part of fig. 17) of the sheath 5 are circumferentially offset from the two retaining grooves 109 of the cap 1 and are respectively located in the two retaining grooves 209 of the needle holder 2, and due to the retaining grooves 209, the two resilient arms maintain a posture inclined toward the axial direction, and the front ends of the two resilient arms symmetrically abut against the outer side wall of the cap 1.

The working process of the needle cap 1, the needle stand 2, the spring 3 and the needle tube 4 of the injection needle head during the injection use and the part entering the self-destruction can be explained by referring to the embodiment 1. The difference lies in that, in the process of forward rotation of the needle cap 1 after self-destruction, the front ends of the other two resilient arms 501 of the sheath 5 always abut against the outer side wall of the needle cap 1 until the needle cap 1 rotates to the position, as shown in the right part of fig. 17 and fig. 18, the other two resilient arms 501 (the resilient arms marked on the right part of fig. 17 and fig. 18) are circumferentially and correspondingly clamped into the two retaining grooves 109 of the needle cap 1, at this time, the injection needle is in a stable self-destruction state, and the needle cap 1 cannot rotate reversely.

Example 3

Referring to fig. 19, the safe anti-needle-stick self-destruction syringe needle comprises a needle cap 1, a needle base 2, a spring 3, a needle tube 4 and a needle cap rotation non-return structure. The difference from the embodiment 1 is that the clamping column 105 of the needle cap 1, the guiding groove 206 of the needle stand 2 and the needle cap rotation check structure are redesigned.

Referring to fig. 20, the needle cap 1 is eliminated from the check stopper 208 of embodiment 1. Redesigned is that the side of the clip 105 of the cap 1 is provided with a clip 1051 to cooperate with the inverted clip 211 in the guiding groove 206 of the needle holder 2 to prevent the cap 1 from rotating reversely in the self-destruction state. In this embodiment, the latch 1051 is located on the opposite side of the latch 105, and includes two teeth formed by front and rear concave parts.

Referring to fig. 21, the guide groove 207 and the check stopper 208 of embodiment 1 are eliminated from the needle holder 2, and the guide groove 206 of the needle holder 2 is redesigned. In this embodiment, each guide slot 206 includes a telescoping segment 2061, a snap-in segment 2064, a start segment 2065, a rotating segment 2063, and a resilient arm 2062. The telescopic section 2061 extends along the axial direction of the needle base 2 and provides a guide for the axial sliding of the clamping column 105 of the needle cap 1; the clamping section 2064 is communicated with the front part of one corresponding reverse side of the telescopic section 2061, and the front end of the clamping section 2064 extends to the front end surface of the needle stand 2 so as to clamp the clamping column 105 of the needle cap 1; the initial section 2065 is communicated with the rear part of the other side of the telescopic section 2061 in the corresponding positive direction, and the initial section 2065 is used as the initial fixing position of the clamping column 105 of the needle cap 1; the rotating section 2063 is communicated with the front part of the other side of the telescopic section 2061 corresponding to the positive direction, and the rotating section 2063 is used as a self-destruction 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 free end of the elastic arm 2062 extends into the snap-in section 2064, so that a passage opening with a width slightly smaller than the clamping column 105 is formed in the snap-in section 2064.

The needle holder 2 is further redesigned to have inverted latch 211 in the rotating section 2063 of the guiding slot 206 to cooperate with the latch 1051 on the latch 105 of the needle cap 1 to prevent the needle cap 1 from rotating reversely in the self-destruction state. In this embodiment, the inverted click tooth 211 includes two teeth formed on both front and rear sides of the rotation section 2063.

The difference during assembly is that the locking column 105 of the needle cap 1 is locked into the guide groove 206 of the needle holder 2, specifically, the locking column 105 of the needle cap 1 is locked into the front end of the locking section 2064 of the guide groove 206, when the locking section 2064 passes through the free end of the elastic arm 2062, the elastic arm 2062 is elastically deformed, after the locking column 105 of the needle cap passes over the elastic arm 2062, the elastic arm 2062 is elastically deformed and restored, the locking column 105 of the needle cap 1 cannot return and is pulled out, then the locking column 105 of the needle cap 1 enters the telescopic section 2061, and is locked into the initial section 2065, and the assembly is completed. The assembly of the remaining components can be explained with reference to example 1.

In the initial state of the injection needle, as shown in the left part of fig. 22, the locking column 105 of the needle cap 1 is locked in the initial section 2065 of the guiding groove 206 of the needle base 2, the spring 3 is in the compressed and twisted state, and the front end of the needle tube 4 passes through the through hole of the needle cap 1 to be exposed.

When the injection needle is used for injection, the needle cap 1 which is propped against a part to be injected can be retracted into the needle seat 2 under the counterforce, in the retraction process of the needle cap 1, the clamping column 105 of the needle cap 1 can slide into the telescopic section 2061 from the initial section 2065 of the guide groove 206 of the needle seat 2, and the spring 3 is further compressed. The more specific description of the direction of the locking pin 105 of the needle cap 1 is: the locking column 105 slides backwards and reversely in the initial section 2065, and the needle cap 1 retracts backwards and rotates reversely to a certain extent; the snap post 105 slides rearward within the telescoping section 2061.

The injection needle is self-destructed immediately after being pulled out after injection, under the action of the elastic force of the spring 3, the clamping column 105 of the needle cap 1 slides forwards along the telescopic section 2061 of the guide groove 206 of the needle stand 2, the needle cap 1 extends out and covers the front end of the needle tube 4, and in the process, the needle cap 1 has not yet rotated forwards under the action of the torsion force of the spring 3, so that the clamping column 105 of the needle cap 1 can not slide into the initial section 2065 of the guide groove 206 of the needle stand 2 any more. When the clip 105 of the needle cap 1 slides forward to be blocked by the elastic arm 2062 of the guiding groove 206 of the needle base 2, under the action of the elastic force and the torsion force of the spring 3, the clip 105 of the needle cap 1 slides into the rotating section 2063 of the guiding groove 206 of the needle base 2, and the needle cap 1 rotates forward, in the process, the needle cap rotation non-return structure is effective, specifically, the clip 1051 on the clip 105 goes over the inverted clip 211 in the rotating section 2063 to form a lock catch for preventing the needle cap 1 from rotating reversely.

Finally, the self-destruction state of the present injection needle is seen in the right part of fig. 22. At this time, if the needle cap 1 is rotated reversely, the latch 1051 on the latch 105 of the needle cap 1 is latched by the inverted latch 211 in the rotating section 2063 of the guiding slot 206 of the needle holder 2, so that the whole structure of the needle cap 1 covering the front end of the needle tube 4 is ensured to be stable.

In addition, referring to fig. 23, a sheath (also called a middle sheath or a clamping piece) 5 which is common in the art is assembled outside the needle seat, an outer protective sheath (also called a shell or an outer needle cap) 6 which is common in the art is assembled outside the sheath 5, and the outer protective sheath 6 integrally protects the injection needle.

Example 4

Referring to fig. 24, the safe anti-needle-prick self-destruction syringe needle comprises a needle cap 1, a needle base 2, a spring 3, a needle tube 4 and a needle cap rotation non-return structure. This embodiment is similar to embodiment 3 except that the locking pin 105 of the needle cap 1, the guiding groove 206 of the needle holder 2 and the needle cap rotation check structure are newly designed.

Referring to fig. 25, the needle cap 1 is redesigned to have an end flat 1052 on the back side of the clip 105.

The guide groove 206 of the needle holder 2 includes a telescopic section 2061, a snap-in section 2064, an initial section 2065, a rotating section 2063, and an elastic arm 2062. The description of the telescopic segment 2061, the snap-in segment 2064, the start segment 2065, and the rotation segment 2063 may refer to embodiment 3 except for the elastic arm 2062. In addition to the elastic arm 2062 blocking the front end of the telescopic segment 2061 and the free end of the elastic arm 2062 extending into the snap-in segment 2064 and forming the passage opening of the clamping column 105 with a width slightly smaller than that of the needle cap 1 in the snap-in segment 2064, in this embodiment, the elastic arm 2062 is provided with the non-return protrusion 20621, and the non-return protrusion 20621 is located at the communication position of the telescopic segment 2061 and the rotating segment 2063, so that the communication position forms a bayonet with a width obviously smaller than the end plane 1052 on the clamping column 105.

The assembly can refer to embodiment 3, and is not described in detail.

The needle head in the initial state, see the left part of fig. 26, and in the injection use, refer to embodiment 3, and will not be described again.

The injection needle is self-destructed immediately after being pulled out after injection, the clamping column 105 of the needle cap 1 slides forwards along the telescopic section 2061 of the guide groove 206 of the needle stand 2 under the action of the elastic force of the spring 3, and the needle cap 1 extends out and covers the front end of the needle tube 4, and the part has no obvious difference with the embodiment 3. The difference is that under the action of the elastic force and the torsion force of the spring 3, the locking column 105 of the needle cap 1 does not slide forward to the passing opening formed by the locking section 2064 and the free end of the elastic arm 2062, but slides forward to the bayonet formed by the elastic arm 2062 blocking the communication position of the telescopic section 2061 and the rotating section 2063, when the locking column 105 passes through the bayonet, the locking column 105 elastically deforms the elastic arm 2062 by pressing the non-return protrusion 20621, when the locking column 105 is locked in the rotating section 2063, the elastic arm 2062 elastically deforms and recovers, the locking column 105 slides along the rotating section 2063, and the needle cap 1 rotates forward.

Finally, the self-destruction state of the present injection needle is seen in the right part of fig. 22. At this time, if the needle cap 1 is rotated reversely, the locking pin 105 of the needle cap 1 is blocked by the non-return protrusion 20621 of the elastic arm 2062, and since the width of the bayonet is smaller than the end plane 1052 of the locking pin 105, the locking pin 105 is limited in the rotating section 2063, so that the whole structure that the needle cap 1 covers the front end of the needle tube 4 is ensured to be stable.

In addition, referring to fig. 27, a sheath (also called a middle sheath or a clamping piece) 5 which is common in the art is assembled outside the needle seat, an outer protective sheath (also called a shell or an outer needle cap) 6 which is common in the art is assembled outside the sheath 5, and the outer protective sheath 6 integrally protects the injection needle.

Example 5

The difference between this embodiment and embodiment 1 is that this embodiment is provided with shielding structures at both ends of the needle holder 2, and referring to fig. 28 and 29, the tail portion of the needle holder 2 is provided with a lower guiding groove 212 which is the same as the guiding groove 206 of embodiment 1, and a shielding structure at the tail portion of the needle holder 2.

The shielding structure at the tail part of the needle base 2 comprises a lower spring 7 and a needle point sheath 8, the lower spring 7 and the needle point sheath 8 are sequentially assembled into the lower part of the needle base 2 from top to bottom, and a lower clamping column 801 is arranged on the outer side wall of the needle point sheath 8.

Referring to fig. 30 and 31, the lower guide grooves 212 and the guide grooves 206 are symmetrical front and back, the side wall of the tail portion of the needle holder 2 is provided with more than one lower guide groove 212, the lower guide grooves 212 are uniformly distributed on the side wall of the tail portion of the needle holder 2 along the circumferential direction, the lower guide grooves 212 are in one-to-one correspondence and match with the lower clamping columns 801 of the needle tip sheath 8, the lower guide grooves 212 are used for guiding the positions of the lower clamping columns 1, each lower guide groove 212 comprises a lower telescopic section 2121, a lower elastic arm 2122 and a lower rotating section 2123, and the lower telescopic section 2121 extends along the axial direction of the needle holder 2 to provide guidance for the axial sliding of the lower clamping columns 801; the lower elastic arm 2122 is arranged in the lower telescopic section 2121, and encloses a lower starting area around the front part of the corresponding reverse side of the lower telescopic section 2121, the lower starting area is used as an initial fixing position of the lower clamping column 801, and the lower elastic arm 2122 prevents the lower clamping column 801 sliding forwards from the lower starting area from entering the starting area backwards again; the lower rotating section 2123 extends along the forward direction of the needle holder 2 and is communicated with the other side tail part of the telescopic section 2121 corresponding to the forward direction, and the lower rotating section 2123 provides a guide for the forward sliding of the lower clamping column 801 and serves as a self-destruction fixing position of the lower clamping column 801.

As shown in FIG. 32, the rearward end of the needle cannula 4 is shielded or exposed in cooperation with the retraction of the needle tip shield 8; after the self-destruction state is initiated, lower catch 801 moves along lower extension 2121, past lower resilient arms 2122 and into lower rotational section 2123 of hub 2 under the action of lower spring 7.

Wherein, the side surface of the lower elastic arm 2122 can be provided with a structure similar to the non-return protrusion 20621 in embodiment 4, so that the lower clamping column 801 is limited in the lower rotating section 2123 under the action of the protrusion reverse return, and thus, the needle point sheath 8 with limited movement and rotation forms a barrier for the needle point, thereby achieving the purpose of safe self-destruction.

It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are given by way of illustration of the invention and are not intended to limit the invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.

Claims

1. Prevent acupuncture self-destruction syringe needle safely, its characterized in that includes:

the needle tube is fixed in the needle tube fixing hole of the needle seat; and

the needle cap rotation non-return structure plays a role in preventing the needle cap from reversely rotating in a self-destruction state;

wherein, in the initial state, the needle cap extends forwards, the clamping column of the needle cap is positioned at the initial fixed position of the guiding groove of the needle seat, the spring is compressed and twisted when being assembled to provide forward elastic force and forward rotating torsion force for the needle cap,

in the using process, the needle cap retracts due to external force, the clamping column of the needle cap slides backwards along the guiding groove of the needle base, the front end of the needle tube extends out of the through hole of the needle cap, the spring is further compressed,

when the needle cap is in a self-destruction state, the needle cap extends forwards under the action of the elasticity and the torsion of the spring to cover the front end of the needle tube and rotates forwards, the clamping column of the needle cap slides to the self-destruction fixed position of the guide groove of the needle base, and at the moment, the needle cap rotation non-return structure prevents the needle cap from rotating backwards.

2. The safety needle-stick-proof self-destructive injection needle according to claim 1, wherein the first spring-limiting structure of the needle cap comprises:

the circular truncated cone is coaxially arranged on the inner side of the front end of the needle cap, and the through hole is formed in the circular truncated cone;

the first guide surface is arranged on the rear end surface of the circular truncated cone; and

the first spring clamping groove is arranged on the first guide surface;

the front end of the spring is sleeved on the circular truncated cone, the front end of the spring is provided with a first clamping hook formed by inwards bending the tail end of the spring wire, and the first clamping hook is clamped into the first spring clamping groove along the first guide surface in a sliding mode.

3. The safety needle-prick prevention self-destruction syringe needle according to claim 2, wherein the first guide surface is a curved surface extending along a spiral line around the axis of the circular truncated cone by less than or equal to one turn, and the first spring catch is disposed at the front end of the first guide surface.

4. The safety needle-stick resistant self-destructive injection needle of claim 1, wherein said needle cap comprises:

the end head is provided with the through hole and the first spring limiting structure; and

the cap body is cylindrical with openings at two ends, the front end of the cap body is connected with the end head, and the clamping column is arranged on the outer side wall of the cap body.

5. The safe and self-destruction syringe needle capable of preventing needle prick as claimed in claim 1, wherein the needle base is cylindrical with two open ends, a diaphragm plate is disposed in the needle base and divides the interior into a front cavity and a rear cavity, a needle tube assembly base is disposed in the front cavity of the needle base along an axis and connected to the diaphragm plate, and the needle tube assembly base is provided with the needle tube fixing hole and the second spring limiting structure.

6. The safety needle-prick prevention self-destruction syringe needle according to claim 5, wherein the second spring limiting structure of the needle holder comprises:

the annular boss is arranged on the outer side wall of the rear end of the needle tube assembly base and is connected with the diaphragm plate;

the second guide surface is arranged on the front end surface of the annular boss; and

the second spring clamping groove is arranged on the second guide surface;

the rear end of the spring is sleeved on the annular boss, the rear end of the spring is provided with a second clamping hook formed by inwards bending the tail end of the spring wire, and the second clamping hook is clamped into the second spring clamping groove along the second guide surface in a sliding mode.

7. The safety needle-stick-proof self-destruction syringe needle according to claim 6, wherein the second guiding surface is an arc-shaped concave surface extending along the circumferential direction and recessed towards the rear, and the second spring catch is disposed at the lowest recessed position of the second guiding surface.

8. The safety needle-stick-proof self-destruction syringe needle as claimed in claim 1, wherein the torsion force of the spring is generated by changing the circumferential angle between the ends of the spring wires at both ends by the first spring-limiting structure of the needle cap and the second spring-limiting structure of the needle holder.

9. The safety needle-prick prevention self-destruction syringe needle according to claim 8, wherein the circumferential angle between the ends of the spring wires at the two 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 holder.

10. The safety needle-stick-proof self-destruction injection needle head according to any one of claims 1 to 9, wherein the guide groove of the needle holder comprises:

a telescopic section extending in the axial direction;

the elastic arm is arranged in the telescopic section and surrounds the front part of one side of the telescopic section, which corresponds to the reverse direction, into an initial area; and

the rotating section extends along the positive direction and is communicated with the front part of the other side of the telescopic section corresponding to the positive direction;

the starting area is used as an initial fixing position of the clamping column of the needle cap, the elastic arm prevents the clamping column which slides backwards from the starting area from entering the starting area again, and the rotating section is used as a self-destruction fixing position of the clamping column of the needle cap;

be equipped with the guide way on the inside wall of needle file, the front end of guide way extends to on the preceding terminal surface of needle file, the rear end of guide way extends to initial region, the guide way is right the card post direction of needle cap makes the card post card go into smoothly initial region.

11. The safety needle-prick prevention self-destruction syringe needle according to claim 10, wherein the needle cap rotation check structure comprises:

the non-return lug is arranged on the outer side wall of the needle cap; and

the non-return stop block is arranged on the inner side wall of the needle seat;

and in the process of forward rotation of the needle cap, the non-return convex block passes over the non-return stop block to form a lock catch for preventing the needle cap from reversely rotating.

12. The safety needle-prick prevention self-destruction injection needle according to claim 10, further comprising: the sheath is in a sleeve shape and is sleeved on the outer side of the needle seat;

the needle cap rotation check structure comprises:

the non-return clamping groove is arranged on the outer side wall of the needle cap;

the avoidance groove is arranged on the outer side wall of the needle seat; and

the non-return elastic arm is arranged on the side wall of the sheath and inclines towards the axis direction relative to the inner side wall of the sheath;

wherein, in the initial state, the non-return clamping groove and the non-return elastic arm are staggered in the circumferential direction, the non-return elastic arm is positioned in the avoiding groove, and the front end of the non-return elastic arm is propped against the outer side wall of the needle cap,

when the needle cap is in a self-destruction state, the reverse stopping elastic arms correspond to each other in the circumferential direction and are clamped into the reverse stopping clamping grooves, and therefore the lock catch for preventing the needle cap from reversely rotating is formed.

13. The safety needle-prick prevention self-destruction syringe needle according to claim 12, wherein the outer side wall of the needle holder is provided with a rib extending axially, the inner side wall of the sheath is provided with a groove extending axially, and the needle holder and the sheath are tightly assembled by the cooperation of the rib and the groove.

14. The safety needle tip of claim 11 to 13, wherein the needle cap is extended forward to cover the front end of the needle tube in the initial state.

15. The safety needle-stick-proof self-destruction syringe needle according to any one of claims 11 to 13, wherein the front end of the needle tube is exposed through the through hole of the needle cap in the initial state.

16. The safety needle-stick-proof self-destruction injection needle head according to any one of claims 1 to 9, wherein the guide groove of the needle holder comprises:

a telescopic section extending in the axial direction;

the clamping section is communicated with the front part of one corresponding reverse side of the telescopic section, and the front end of the clamping section extends to the front end surface of the needle base so as to clamp the clamping column of the needle cap;

the starting section is communicated with the rear part of the other side of the telescopic section in the forward direction;

the rotating section is communicated with the front part of the other side of the telescopic section in the corresponding positive direction; and

the elastic arm blocks the front end of the telescopic section, and the suspended end of the elastic arm extends into the clamping section to form a passage opening with the width smaller than that of the clamping column in the clamping section;

the starting section is used as an initial fixing position of the clamping column of the needle cap, and the rotating section is used as a self-destruction fixing position of the clamping column of the needle cap.

17. The safety needle-stick-proof self-destructive injection needle of claim 16, wherein the needle cap rotation check structure comprises:

the latch is arranged on the side surface of the clamping column of the needle cap; and

the inverted latch is arranged in the rotating section;

when the needle cap rotates forwards and the clamping column of the needle cap slides along the rotating section, the clamping teeth pass over the inverted clamping teeth to form a lock catch for preventing the needle cap from rotating reversely.

18. The safety needle-stick-proof self-destructive injection needle of claim 16, wherein the needle cap rotation check structure comprises:

the end plane is arranged on the rear side of the side face of the clamping column of the needle cap; and

the non-return bulge is arranged on the elastic arm, and the non-return bulge enables the communication part of the telescopic section and the rotating section to form a bayonet with the width smaller than that of the end plane;

when the needle cap is in a self-destruction state, the clamping column of the needle cap is blocked by the non-return bulge and the end plane is blocked by the clamping opening and limited in the rotating section to form a lock catch for preventing the needle cap from reversely rotating.

19. The safety needle-stick-proof self-destructive injection needle according to claim 18, further comprising:

the sheath is in a sleeve shape and is sleeved on the outer side of the needle seat; and

and the outer protective sleeve is sleeved outside the protective sleeve.

20. The safety needle-stick-proof self-destructive injection needle according to any one of claims 1 to 9, further comprising

The lower spring is positioned in the inner cavity of the needle base and below the spring;

the needle tip sheath is positioned below the lower spring and embedded at the tail end of the needle base, and a lower clamping column is arranged on the outer side wall;

wherein, in the initial state, the needlepoint sheath retreats, the lower clamping column is positioned at the initial fixed position of the lower guide groove of the needle base, the lower spring is compressed and twisted to provide backward elasticity and forward rotation torsion to the needlepoint sheath when being assembled,

in the using process, the needlepoint protective cover is pressed forwards by external force, the lower clamping column slides forwards along the lower guide groove,

21. The safety needle-prick prevention self-destruction injection needle according to claim 20, wherein the lower guide groove comprises:

a lower telescopic section extending in the axial direction;

the lower elastic arm is arranged in the lower telescopic section and surrounds the tail part of one side of the lower telescopic section, which corresponds to the reverse direction, into a lower starting area; and

the lower rotating section extends along the positive direction and is communicated with the tail part of the other side of the lower telescopic section corresponding to the positive direction;