CN113456947B - Safety anti-needlestick self-destructive injection needle - Google Patents

Abstract

The safe needle-prick-preventing self-destroying injection needle head includes needle cap, needle seat, spring, needle tube and needle cap rotating non-return structure. The needle cap is provided with a first spring limiting structure and a clamping column, the needle seat 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 the spring is automatically formed to provide forward elastic force and forward rotating torsion force for the needle cap in the assembly process. In the initial state, the clamping column is positioned at the initial fixing position of the guide groove, the needle cap and the clamping column move backwards in the use process, the needle tube stretches out, in the self-destruction process, the needle cap stretches out to cover the needle tube, the needle cap rotates forwards, the needle cap rotation non-return structure is effective, and the needle cap is prevented from rotating reversely. The whole product has stable structure, simple process and high economic benefit, realizes automatic self-destruction, has stable and effective integral structure in the self-destruction state, has good shielding and protecting effects on the double-end needle points of the needle tube, and improves the safety.

Description

Safety needle-prick-proof self-destroying injection needle

Technical Field

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

Background

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

The Chinese patent publication No. CN10449195B discloses a safe insulin pen needle, which has the advantages that in the process of injecting insulin, a protector is triggered, and after the injection is completed, the needle tip is instantly protected, so that the needle tip can be prevented from damaging doctors or patients.

However, the safety insulin pen needle of the above type has the defect of unstable structure, and the automatic protection of the needle head by the trigger protector is effective when a user correctly uses the insulin pen needle according to the regulations. However, when some users withdraw the needle after insulin injection, the habit of rotating the insulin pen needle is generated, so in the process, the reliability of the triggering device is low due to the instable structure, and thus, the automatic protection function of the triggering protector on the needle head is very likely to be invalid due to the rotation action. Because of the failure of the automatic protection of the needle head caused by rotating the insulin pen needle when the needle is pulled out, improvements are now necessary to the insulin pen needle to prevent the occurrence of the automatic protection failure risk event.

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

Disclosure of Invention

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

The aim of the invention can be achieved by the following technical scheme:

the safe anti-needling self-destruction injection needle comprises:

the needle cap is embedded at the front end of the needle seat, a through hole arranged along the axis is arranged at the front end of the needle cap, a first spring limiting structure is arranged at the inner side of the front end, and a clamping column is arranged on the outer side wall of the needle cap;

the needle seat 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 seat 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 seat, and two ends of the spring are respectively arranged on the first spring limiting structure and the second spring limiting structure;

a needle tube fixed in the needle tube fixing hole of the needle seat, and

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

When the needle cap is in an initial state, the needle cap extends forwards, the clamping column of the needle cap is positioned at the initial fixing 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 during assembly.

In the use process, the needle cap is contracted after being stressed by external force, the clamping column of the needle cap slides backwards 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.

When in a self-destruction state, the needle cap extends forwards to cover the front end of the needle tube under the action of the elasticity and torsion of the spring and rotates forwards, the clamping column of the needle cap slides to the self-destruction fixing 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 reversely.

Preferably, the first spring limiting structure of the needle cap comprises a round table coaxially arranged on the inner side of the front end of the needle cap, a through hole formed in the round table, a first guide surface arranged on the rear end face of the round table, and a first spring clamping groove arranged on the first guide surface. The front end of the spring is sleeved on the round table, a first clamping hook formed by inwards bending the tail end of the spring wire is arranged at the front end of the spring, and the first clamping hook is clamped into the first spring clamping groove in a sliding mode along the first guide surface. In some embodiments, the first guiding 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 guiding surface.

Preferably, the needle cap adopts a split structure and comprises a head, wherein the head is provided with a through hole and a first spring limiting structure, and a cap body which is cylindrical with two open ends, the front end of the cap body is connected with the head, and the outer side wall of the cap body is provided with a clamping column.

Preferably, the needle seat is cylindrical with two open ends, a diaphragm plate dividing the inner part into a front cavity and a rear cavity is arranged in the needle seat, a needle tube assembly base which is arranged along the axis and connected with the diaphragm 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 an annular boss, a second guide surface and a second spring clamping groove, wherein 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, a second clamping hook formed by inwards bending the tail end of the spring wire is arranged at the rear end of the spring, and the second clamping hook is clamped into a second spring clamping groove in a sliding mode along a second guide surface. In some embodiments, the second guiding surface is an arc concave surface extending along a circumferential direction and recessed backwards, and the second spring clamping groove is arranged at the lowest recess of the second guiding surface.

Preferably, the torsion of the spring is generated by changing the circumferential included angle between the ends of the spring wires at the two ends by the first spring limit structure of the needle cap and the second spring limit structure of the needle seat. In some embodiments, the circumferential angle between the ends of the spring wire at the two ends of the spring is changed from 180 ° to 90 ° by the first spring stop feature of the needle cap and the second spring stop feature of the needle hub.

The guide groove of the needle seat and the needle cap rotating non-return structure are respectively designed with various structures.

Preferably, the guide groove of the needle seat comprises a telescopic section extending along the axial direction, an elastic arm arranged in the telescopic section and surrounding the front part of one side of the telescopic section corresponding to the reverse direction into a starting area, and a rotating section extending along the forward direction and communicated with the front part of the other side of the telescopic section corresponding to the forward direction. The needle cap can extend forwards to cover the front end of the needle tube in the initial state, the elastic arm prevents the card column sliding backwards from the initial area from entering the initial area, and the rotating section serves as a self-destruction fixing position of the card 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 the initial region, and the guide way makes the card post card go into the initial region smoothly to the card post direction of needle cap.

In some examples implemented on the basis of the guide groove of the needle holder, the needle cap rotation backstop structure comprises a backstop lug arranged on the outer side wall of the needle cap and a backstop block arranged on the inner side wall of the needle holder. Wherein, in the process of the forward rotation of the needle cap, the backstop lug passes over the backstop block to form a lock catch for preventing the reverse rotation of the needle cap.

In other examples implemented on the basis of the guide groove of the needle seat, the safe anti-needling self-destruction injection needle also comprises a sheath which is sleeve-shaped and sleeved on the outer side of the needle seat. The needle cap rotating backstop structure comprises a backstop clamping groove 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 backstop elastic arm arranged on the side wall of the sheath and inclined to the axial direction relative to the inner side wall of the sheath. The anti-return elastic arm is positioned in the avoiding groove, the front end of the anti-return elastic arm is propped against the outer side wall of the needle cap, and the anti-return elastic arm corresponds to and is clamped into the anti-return clamping groove in the circumferential direction in the self-destruction state to form a lock catch for preventing the needle cap from rotating reversely. In addition, can be equipped with the protruding muscle of axial extension on the lateral wall of needle file, can be equipped with the recess of axial extension on the inside wall of sheath, realize closely assembling through protruding muscle and recess cooperation between needle file and the sheath.

Preferably, the guide groove of the needle seat comprises a telescopic section extending along the axial direction, a clamping section communicated with the front part of one side of the telescopic section corresponding to the reverse direction, wherein the front end of the clamping section extends to the front end surface of the needle seat for clamping a clamping column of the needle cap, a starting section communicated with the rear part of the other side of the telescopic section corresponding to the forward direction, a rotating section communicated with the front part of the other side of the telescopic section corresponding to the forward direction, and an elastic arm for blocking the front end of the telescopic section, wherein the suspension end of the elastic arm extends into the clamping section and forms a through hole with the width of Yu Kazhu in the clamping section. The initial section is used as the initial fixing position of the clamping column of the needle cap, the front end of the needle tube can also penetrate through the through hole of the needle cap to expose a section in the initial state, and 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 stopping structure comprises a latch arranged on the side surface of the latch post of the needle cap and a reverse latch arranged in the rotating section. In the process that the needle cap rotates positively 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.

In other examples implemented on the basis of the guide groove of the needle seat, the needle cap rotation backstop structure comprises an end plane and backstop bulges, wherein the end plane is arranged at the rear side of the side face of the clamping column of the needle cap, and the backstop bulges are arranged on the elastic arms, so that a bayonet with the width smaller than that of the end plane is formed at the communication part of the telescopic section and the rotary section by the backstop bulges. When the needle cap is in a self-destruction state, the clamping column of the needle cap is blocked by the backstop bulge and the end plane is blocked by the bayonet to be limited in the rotating section, so that a lock catch for preventing the needle cap from reversely rotating is formed.

In addition, the safe needle-prick-preventing self-destroying injection needle can also comprise a sheath which is sleeve-shaped and sleeved on the outer side of the needle seat, and an outer protective sleeve which is sleeved on the outer side of the sheath for integrally protecting the injection needle.

The safe needle-pricking-preventing self-destroying injection needle also comprises a lower spring, a needle tip shield, a needle seat rotating non-return structure and a needle seat rotating non-return structure, wherein the lower spring is positioned in an inner cavity of the needle seat and below the spring;

And in an initial state, the needle tip sheath retreats, the lower clamping column is positioned at an initial fixing position of the lower guide groove of the needle seat, and the lower spring is compressed and twisted to provide backward elasticity and forward rotating torsion for the needle tip sheath during assembly.

In the use process, the needle tip sheath is pressed forwards by external force, and the lower clamping column slides forwards along the lower guide groove.

When in a self-destruction state, the needle tip shield retreats to cover the tail end of the needle tube under the action of the elasticity and torsion of the lower spring and rotates forward, and the lower clamping column slides to the self-destruction fixing position of the lower guide groove.

Preferably, the lower guide groove comprises a lower telescopic section extending along the axial direction; the lower rotating section extends along the forward direction and is communicated with the tail part of the other side of the lower telescopic section, which corresponds to the forward direction;

The lower initial region is used as an initial fixing position of the lower clamping column, the lower elastic arm prevents the lower clamping column sliding forward from the lower initial region from entering the lower initial region, and the lower rotating section is used as a self-destruction fixing position of the lower clamping column.

Compared with the prior art, the needle cap has the beneficial effects that the first spring limiting structure and the clamping column are arranged on the needle cap, the second spring limiting structure and the guide groove are correspondingly arranged on the needle seat, the two ends of the spring are respectively arranged on the first spring limiting structure and the second spring limiting structure, the torsion for providing forward elasticity and forward rotation for the needle cap is automatically formed in the assembly process, and the needle cap rotation backstop structure is also arranged. Wherein, the key points are that the guide groove of the needle seat and the needle cap rotating non-return structure are respectively designed with various 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; in the self-destruction process, the needle cap stretches out under the action of the axial elasticity of the spring to cover the needle tube, the needle cap rotates positively under the action of the forward torsion of the spring, the rotation check structure of the needle cap takes effect to prevent the needle cap from rotating reversely, and 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.

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

Drawings

Fig. 1 is a schematic structural diagram 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 structure diagram of embodiment 1;

Fig. 4 is a schematic structural view of the needle cap in embodiment 1;

Fig. 5 is a schematic view of the structure of the needle holder in embodiment 1;

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

fig. 7 is a schematic diagram showing correspondence between a top view and a perspective view of the spring in embodiment 1;

Fig. 8 is a schematic diagram showing the spring of embodiment 1 before and after assembly with the needle cap and the needle holder;

FIG. 9 is a schematic diagram showing the change from the initial state to the self-destruct state in example 1;

FIG. 10 is a cross-sectional view of example 1 in a self-destructed state;

Fig. 11 is a perspective view of the cooperation of the backstop bump of the needle cap and the backstop bump of the needle holder in the self-destruction state of embodiment 1;

Fig. 12 is a top view showing the cooperation of the backstop bump of the needle cap and the backstop bump of the needle holder in the self-destruction state of embodiment 1;

fig. 13 is a sectional view of embodiment 2 in an initial state;

fig. 14 is a schematic view showing an exploded structure of the needle cap and the needle holder and the sheath in embodiment 2;

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

fig. 16 is a schematic view showing the internal structure of the sheath in embodiment 2;

FIG. 17 is a schematic diagram showing the change from the initial state to the self-destruct state in example 2;

FIG. 18 is a schematic view showing the structure of the cooperation between the locking groove of the cap and the locking elastic arm of the sheath in the self-destruction state in example 2;

fig. 19 is a schematic view of the structure of embodiment 3 in an initial state;

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

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

FIG. 22 is a schematic diagram showing the change from the initial state to the self-destruct state in example 3;

Fig. 23 is a schematic structural view of the embodiment 3 equipped with a sheath and an outer sheath;

Fig. 24 is a schematic view showing the structure of embodiment 4 in an initial state;

fig. 25 is an exploded view of the cap and hub of embodiment 4;

FIG. 26 is a schematic diagram showing the change from the initial state to the self-destruct state in example 4;

fig. 27 is a schematic view showing the structure of example 4 with a sheath and an outer sheath assembled thereon;

fig. 28 is a schematic view showing the structure of the needle hub of embodiment 5 equipped with a lower spring and a needle tip shield;

Fig. 29 is a schematic view showing an exploded structure of the needle holder, the lower spring and the needle tip shield in embodiment 5;

Fig. 30 is a schematic view of the structure of embodiment 5 in an initial state;

FIG. 31 is a schematic diagram of the structure of embodiment 5 in a self-destructed state;

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

The reference numerals are as follows:

1 needle cap

101 Through hole

102 Round bench

103 First guide surface

104 First spring clamping groove

105 Card post

1051 Latch

1052 End plane

106 Check bump

1061 First incline

107 End

108 Cap body

109 Non-return slot

2 Needle stand

201 Diaphragm plate

202 Needle tube assembly base

203 Annular boss

204 Second guide surface

205 Second spring clamping groove

206 Guide groove

2061 Telescoping section

2062 Spring arm

20621 Backstop bulge

2063 Rotating segment

2064 Snap-in section

2065 Initiation stage

207 Guide slot

208 Reverse stop block

2081 Second inclined plane

209 Avoiding groove

210 Convex rib

211 Inverted latch

212 Lower guide groove

2121 Lower telescoping section

2122 Lower spring arm

2123 Lower rotating section

3 Spring

301 First hook

302 Second hook

4 Needle tube

5 Sheath

501 Backstop elastic arm

502 Groove

6 Outer protective sleeve

7 Lower spring

8 Needle tip shield

801 Lower clamping column.

Detailed Description

The following detailed description of the invention, taken in conjunction with the accompanying drawings, will provide those skilled in the art with a more readily understood understanding of how the invention may be practiced. While the present invention has been described in connection with the preferred embodiments thereof, these embodiments are set forth only and are not intended to limit the scope of the invention.

Example 1

Referring to fig. 1 to 3, the safety anti-needling self-destruction injection needle comprises a needle cap 1, a needle seat 2, a spring 3, a needle tube 4 and a needle cap rotation non-return structure. The needle cap 1 is embedded at the front end of the needle seat 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 seat 2, and two ends of the spring are respectively arranged 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, and provides elasticity for moving forwards along the axial direction and torsion for rotating forwards along the circumferential direction for the needle cap 1, so that the needle cap 1 can extend forwards and rotate forwards when the injection needle enters self-destruction. The needle tube 4 is fixed in the needle seat 2, and the front end of the needle tube 4 is matched with the needle cap 1 to stretch out and draw back so as to be shielded or exposed. The needle cap rotation non-return structure plays a role in preventing the needle cap 1 from rotating reversely when the injection needle is in a self-destruction state. The term "forward direction" refers to the direction "reverse", and may be either clockwise or counterclockwise. For a specific description, see below.

Referring to fig. 4, the needle cap 1 is sleeve-shaped, and a through hole 101 provided along an axis is provided at the front end of the needle cap 1 to allow 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 mounting the front end of the spring 3. In this embodiment, the first spring limiting structure includes a circular truncated cone 102, a first guiding surface 103, and a first spring clamping groove 104. The round table 102 is sleeved at the front end of the spring 3, the round table 102 is arranged on the inner side of the front end of the needle cap 1 and coaxially arranged with the needle cap 1, the through hole 101 is formed in the round table 102, the first guide surface 103 is used for guiding the first clamping hook 301 at the front end of the spring 3, the first clamping 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 round table 102 and is a curved surface which extends for less than or equal to one circle along a spiral line around the axis of the round table 102, the first clamping hook 104 is a half circle in the drawing, the first spring clamping groove 104 is used for clamping the first clamping hook 301 of the spring 3, the first spring clamping groove 104 is arranged on the first guide surface 103, and the first spring clamping groove 104 is arranged at the front end of the first guide surface 103.

The outer side wall of the needle cap 1 is provided with more than one clamping column 105 and more than one check protruding block 106, and the more than two clamping columns 105 and the more than two check protruding blocks 106 can be respectively and circumferentially distributed on the outer side wall of the needle cap 1.

In addition, the needle cap 1 may be of a combined structure so as to facilitate the processing of the first spring limit structure. In this embodiment, the needle cap 1 is formed by connecting an end 107 and a cap body 108, the end 107 is provided with a through hole 101 and a first spring limiting structure, the cap body 108 is cylindrical with two open ends, the front end of the cap body 108 is connected with the end 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 has a cylindrical shape with two open ends, a diaphragm 201 is integrally arranged in the needle holder 2, and the diaphragm 201 divides the interior of the needle holder 2 into a front cavity and a rear cavity. The front cavity of the needle seat 2 is internally provided with a columnar needle tube assembly base 202 which is connected with the diaphragm 201 into a whole and is coaxially arranged with the needle seat 2, the needle tube assembly base 202 is provided with a needle tube fixing hole which is communicated along the axis, and the needle tube 4 can be fixed in the needle tube assembly base through environment-friendly quick-drying glue, as shown in figure 2. The needle cap 1 and the spring 3 are installed in the front cavity of the needle holder 2, which will be described with emphasis. The rear cavity of the needle seat 2 is used for being connected with a needle cylinder, and a thread or an embedded opening used for being connected with the needle cylinder is arranged in the rear cavity.

The needle tube assembly base 202 is provided with a second spring limit 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 guiding surface 204, and a second spring clamping groove 205. The annular boss 203 is sleeved at the rear end of the spring 3, 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 201 into a whole, the second guide surface 204 is used for guiding the second clamping hooks 302 at the rear end of the spring 3, the second clamping hooks 302 are smoothly clamped into the second spring clamping grooves 205, the second guide surface 204 is arranged on the front end surface of the annular boss 203 and is provided with arc-shaped concave surfaces, the number of the arc-shaped concave surfaces can be more than two and are uniformly distributed along the circumferential direction of the annular boss 203, each arc-shaped concave surface extends along the circumferential direction and is recessed backwards, the second spring clamping grooves 205 are used for clamping the second clamping hooks 302 of the spring 3, and each arc-shaped concave surface is provided with a second spring clamping groove 205, and preferably, the lowest recess of each arc-shaped concave surface is provided with one second spring clamping groove 205.

More than one guide groove 206 is arranged on the side wall of the corresponding front cavity of the needle seat 2, more than two guide grooves 206 can be uniformly distributed on the side wall of the needle seat 2 along the circumferential direction, the guide grooves 206 are in one-to-one correspondence and match with the clamping columns 105 of the needle cap 1, and the guide 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 flexible section 2061 extends along the axial direction of the needle seat 2 to provide guidance for the axial sliding of the clamping post 105, the flexible arm 2062 is arranged in the flexible section 2061 and encloses the front part of one side of the flexible section 2061 corresponding to the reverse direction into a starting area, the starting area is used as an initial fixing position of the clamping post 105, the flexible arm 2062 prevents the clamping post 105 sliding backwards from the starting area from entering the starting area forwards, the rotary section 2063 extends along the forward direction of the needle seat 2 and is communicated with the front part of the other side of the flexible section 2061 corresponding to the forward direction, and the rotary section 2063 provides guidance for the forward sliding of the clamping post 105 and is used as a self-destroying fixing position of the clamping post 105.

The front end of the inner side wall of the corresponding front cavity of the needle seat 2 is provided with more than one guide groove 207 and more than one backstop block 208, and the more than two guide grooves 207 and the more than two backstop lugs 106 can be respectively and circumferentially distributed on the inner side wall of the needle seat 2. The guide groove 207 extends along the axial direction of the needle holder 2, the front end extends onto the front end surface of the needle holder 2, the rear end extends to the initial area 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 into the initial area in the telescopic section 2061 of the guide groove 206 in an interference manner through the guide groove 207. The backstop block 208 and the backstop bump 106 of the needle cap 1 form a needle cap backstop structure in the embodiment, the backstop bump 106 and the backstop block 208 are respectively provided with a first inclined plane 1061 and a second inclined plane 2081, see the partial enlarged view of fig. 12, when the needle cap 1 rotates forward relative to the needle seat 2, the backstop bump 106 can smoothly pass over the backstop block 208 through the contact fit of the first inclined plane 1061 and the second inclined plane 2081, and then if the needle cap 1 rotates reversely, the backstop bump 106 is blocked by the backstop 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 round table 102 of the needle cap 1, the tail end of a spring wire at the front end of the spring 3 is inwards bent to form a first clamping hook 301, and the first clamping hook 301 is slidably clamped into the first spring clamping groove 104 along the first guiding surface 103 of the needle cap 1. The rear end of the spring 3 is matched 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, the tail end of the spring wire at the rear end of the spring 3 is bent inwards to form a second clamping hook 302, and the second clamping hook 302 is clamped into the second spring clamping groove 205 in a sliding manner along the second guide surface 204 of the needle seat 2.

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 included angle between the first hook 301 and the second hook 302 of the spring 3 is changed compared with that before assembly, so that torque is formed. In this embodiment, referring to fig. 7 and 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 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 assembly process, simplifies the assembly process and improves the assembly efficiency.

In the initial state of the injection needle, see the left part of fig. 9, at this time, the needle cap 1 covers the front end of the needle tube 4, the clamping post 105 of the needle cap 1 is positioned in the initial area in 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.

When the injection needle is used for injection, as shown in the middle part of fig. 9, the needle cap 1 propped against the injection site is retracted into the needle seat 2 by the reaction force, during the retraction process of the needle cap 1, the clamping post 105 of the needle cap 1 slides backwards from the initial area in the telescopic section 2061 of the guide groove 206 of the needle seat 2, when the clamping post 105 of the needle cap 1 passes through the elastic arm 2062, the elastic arm 2062 is elastically deformed, after the clamping post 105 of the needle cap 1 passes through the elastic arm 2062, the elastic arm 2062 is elastically deformed and restored, the clamping post 105 of the needle cap 1 cannot enter the initial area in the telescopic section 2061 of the guide groove 206 any more, and the spring 3 is further compressed.

The injection needle enters self-destruction immediately after injection and extraction, see the right part of fig. 9, 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 seat 2 under the elastic force of the spring 3, and the needle cap 1 extends out and covers the front end of the needle tube 4. Then, under the torsion of the spring 3, the locking post 105 of the needle cap 1 enters the rotating section 2063 of the guide groove 206 of the needle seat 2 and slides along one end to the other end of the rotating section 2063, and the needle cap 1 rotates forward, and in this process, the needle cap rotation check structure is effective, specifically, the check bump 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, so as to form a lock catch preventing the needle cap 1 from rotating reversely.

Finally, referring to fig. 10, the self-destruction state of the present injection needle is shown, and the tip of the needle tube 4 is concealed within the needle cap 1 and shielded by the needle cap 1. At this time, referring to fig. 11 and 12, the check protrusion 106 of the needle cap 1 cooperates with the check block 208 of the needle seat 2 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 block 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 destroy the lock catch, and the occurrence of automatic protection failure caused by the fact that the clamping post 105 of the needle cap 1 returns to the telescopic section 2061 of the guide groove 206 of the needle seat 2 is avoided.

Example 2

Referring to fig. 13 and 14, the safety anti-needling self-destruction injection needle comprises a needle cap 1, a needle seat 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 (which may also be called a middle sheath or a fastener) 5 is newly added, and the needle cap rotation check structure is redesigned.

Referring to fig. 14 and 15, the non-return tab 106 of embodiment 1 is eliminated from the needle cap 1. The redesigned is that there is more than one backstop draw-in groove 109 on the lateral wall of needle cap 1, and more than two backstop draw-in grooves 109 can be along circumference equipartition on the lateral wall of needle cap 1, and backstop draw-in groove 109 is used for cooperating the backstop elastic arm 501 of sheath 5 to play the effect of preventing needle cap 1 reverse rotation.

The backstop 208 of embodiment 1 is eliminated from the hub 2. The redesigned is that the lateral wall front end of needle file 2 is equipped with more than one and dodges the groove 209, and more than two dodges the groove 209 and can be followed circumference equipartition on the lateral wall of needle file 2, dodges the groove 209 and be used for dodging the backstop elastic arm 501 of sheath 5. In addition, the rear part of the outer side wall of the needle seat 2 is provided with more than one axially extending convex rib 210, and the more than two convex ribs 210 can be circumferentially and uniformly distributed on the outer side wall of the needle seat 2, and the convex ribs 210 are used for being matched with the grooves 502 of the sheath 5 to realize tight assembly between the needle seat 2 and the sheath 5.

The sheath 5 is a new component in the embodiment, the sheath 5 is in a sleeve shape with two open ends, and the sheath 5 is sleeved on the outer side of the needle seat 2. The difference from the common sheath in the art 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 circumferentially distributed on the side wall of the sheath 5, each non-return elastic arm 501 inclines 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 blocked in the non-return clamping grooves 109 of the needle cap 1 to prevent the needle cap 1 from rotating reversely. In addition, the rear part of the inner side wall of the sheath 5 is provided with more than one axially extending groove 502, as shown in 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 tight assembly with the needle seat 2.

Preferably, two non-return clamping grooves 109 are uniformly distributed on the outer side wall of the needle cap 1 along the circumferential direction, two avoiding grooves 209 are uniformly distributed on the front end of the outer side wall of the needle seat 2 along the circumferential direction, four convex ribs 210 are uniformly distributed on the rear part of the outer side wall of the needle seat 2 along the circumferential direction, four non-return elastic arms 501 are uniformly distributed on the front part of the side wall of the sheath 5 along the circumferential direction, and four grooves 502 are uniformly distributed on the rear part of the inner side wall of the sheath 5 along the circumferential direction. The operation of the safety needle-stick resistant self-destructing injection needle is described in this preferred embodiment, see in particular below.

In the initial state of the injection needle, see the left part of fig. 17, and the explanation of the cap 1, the needle holder 2, the spring 3 and the needle tube 4 at this time is referred to in embodiment 1. The difference is that the two non-return elastic arms 501 of the sheath 5 (see non-return elastic arms marked on the left part of fig. 17) correspond to the two non-return locking grooves 109 of the needle cap 1 in the circumferential direction respectively, but are separated from the two non-return locking grooves 109 of the needle cap 1 due to being blocked by the front part of the side wall of the needle holder 2, the other two non-return elastic arms of the sheath 5 (not shown on the left part of fig. 17) are staggered with the two non-return locking grooves 109 of the needle cap 1 in the circumferential direction and are respectively positioned in the two avoiding grooves 209 of the needle holder 2, the two non-return elastic arms maintain the inclined posture in the axial direction due to the avoiding grooves 209, and the front ends of the two non-return elastic arms symmetrically abut against the outer side wall of the needle cap 1.

The working procedures of the needle cap 1, the needle seat 2, the spring 3 and the needle tube 4 can be described with reference to the embodiment 1 when the injection needle is used for injection and enters the self-destroying part. The difference is that, in the process of forward rotation of the needle cap 1 after self-destruction, the front ends of the other two non-return elastic arms 501 of the sheath 5 are always propped against the outer side wall of the needle cap 1 until the needle cap 1 rotates in place, see the right part of fig. 17 and fig. 18, the other two non-return elastic arms 501 (see the non-return elastic arms marked on the right part of fig. 17 and fig. 18) are respectively corresponding to and clamped into the two non-return clamping grooves 109 of the needle cap 1 in the circumferential direction, at this time, the injection needle is in a self-destruction state with stable structure, and the needle cap 1 cannot reversely rotate.

Example 3

Referring to fig. 19, the safety anti-needling self-destruction injection needle comprises a needle cap 1, a needle seat 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 locking post 105 of the cap 1, the guide groove 206 of the needle holder 2, and the cap rotation stopping structure are redesigned.

Referring to fig. 20, the backstop 208 of embodiment 1 is eliminated from the needle cap 1. Redesigned is that the latch 1051 is provided on the side of the latch 105 of the needle cap 1 to mate with the inverted latch 211 in the guide slot 206 of the needle hub 2 to prevent the needle cap 1 from rotating in the reverse direction in the self-destructed state. In this embodiment, the latch 1051 is located on the opposite side of the latch 105, and includes two teeth formed by concave front and rear sides.

Referring to fig. 21, the guide groove 207 and the reverse stopper 208 in 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 section 2061, a snap-in section 2064, a start section 2065, a swivel section 2063, and a resilient arm 2062. The telescopic section 2061 extends along the axial direction of the needle holder 2 to provide guidance 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 side of the telescopic section 2061 corresponding to the reverse direction, the front end of the clamping section 2064 extends to the front end surface of the needle holder 2 to clamp the clamping column 105 of the needle cap 1, the starting section 2065 is communicated with the rear part of the other side of the telescopic section 2061 corresponding to the forward direction, the starting section 2065 is used as an 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 forward direction, the rotating section 2063 is used as a self-destroying fixing position of the clamping column 105 of the needle cap 1, the elastic arm 2062 is used for blocking the front end of the telescopic section 2061, the suspension end of the elastic arm 2062 extends into the clamping section 2064, and the clamping section 2064 is provided with a through hole with a width of Yu Kazhu slightly smaller than that of the clamping section 2064.

The needle holder 2 is also redesigned with inverted latch teeth 211 provided in the rotation section 2063 of the guide channel 206 to cooperate with the latch teeth 1051 on the latch posts 105 of the needle cap 1 to prevent the needle cap 1 from rotating in the reverse direction in the self-destruct state. In this embodiment, the inverted latch 211 includes two teeth formed on both front and rear sides of the rotation section 2063.

The difference in assembly is that the engagement of the engagement post 105 of the cap 1 with the guide groove 206 of the needle holder 2 is that, specifically, the engagement post 105 of the cap 1 is engaged from the front end of the engagement section 2064 of the guide groove 206, when the engagement section 2064 passes through the free end of the elastic arm 2062, the elastic arm 2062 is elastically deformed, after the engagement post 105 of the cap passes over the elastic arm 2062, the elastic arm 2062 is elastically deformed and restored, the engagement post 105 of the cap 1 cannot return and is disengaged, and then the engagement post 105 of the cap 1 enters the telescoping section 2061 and is engaged into the initial section 2065, thereby completing the assembly. The assembly of the remaining components is described with reference to example 1.

In the initial state of the injection needle, see the left part of fig. 22, the clamping column 105 of the needle cap 1 is clamped in the initial 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 to expose a section.

When the injection needle is used for injection, the needle cap 1 propped against the injection part can be retracted into the needle seat 2 by the reaction force, 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 during the retraction process of the needle cap 1, and the spring 3 is further compressed. The more specific description of the orientation of the bayonet 105 of the cap 1 is that the bayonet 105 slides back and forth simultaneously in the initial section 2065, the cap 1 will rotate back a certain degree while retracting back, and the bayonet 105 slides back in the telescoping section 2061.

The injection needle enters self-destruction immediately after injection and extraction, the clamping column 105 of the needle cap 1 slides forwards along the telescopic section 2061 of the guide groove 206 of the needle seat 2 under the action of the elastic force of the spring 3, the needle cap 1 stretches out and covers the front end of the needle tube 4, and in the process, the needle cap 1 does not rotate forwards yet 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 seat 2 any more. When the latch 105 of the needle cap 1 slides forward to be blocked by the elastic arm 2062 of the guide groove 206 of the needle holder 2, the latch 105 of the needle cap 1 slides into the rotating section 2063 of the guide groove 206 of the needle holder 2 under the action of the elastic force and torsion force of the spring 3, and the needle cap 1 rotates forward, in this process, the rotation check structure of the needle cap is effective, specifically, the latch 1051 on the latch 105 passes over the inverted latch 211 in the rotating section 2063 to form a lock catch preventing the reverse rotation of the needle cap 1.

Finally, the self-destruct state of the present needle is seen in the right part of fig. 22. At this time, if the needle cap 1 is reversely rotated, the latch 1051 on the latch 105 of the needle cap 1 will be caught by the inverted latch 211 in the rotating section 2063 of the guide slot 206 of the needle holder 2, thus ensuring the whole structure of the needle cap 1 covering the front end of the needle tube 4 to be stable.

Further, referring to fig. 23, a sheath (which may also be called a middle sheath or a clip) 5, which is common in the art, is provided outside the needle holder, and an outer sheath (which may also be called a housing or an outer needle cap) 6, which is common in the art, is provided outside the sheath 5, and the outer sheath 6 integrally protects the injection needle.

Example 4

Referring to fig. 24, the safety anti-needling self-destruction injection needle comprises a needle cap 1, a needle seat 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 clip post 105 of the cap 1, the guide groove 206 of the hub 2, and the cap rotation stopping structure are redesigned.

Referring to fig. 25, the needle cap 1 is redesigned in that the rear side on the side of the bayonet 105 is provided with an end plane 1052.

The guide groove 206 of the needle holder 2 includes a telescoping section 2061, a snap-in section 2064, a start section 2065, a rotating section 2063, and a resilient arm 2062. The telescoping section 2061, snap-in section 2064, start section 2065, and rotating section 2063 are described with reference to embodiment 3, with the difference being the resilient arms 2062. In addition to the elastic arm 2062 blocking the front end of the telescoping section 2061 and the free end of the elastic arm 2062 extending into the snap-in section 2064 and forming a passage opening in the snap-in section 2064 having a width slightly smaller than the snap-in post 105 of the needle cap 1, in this embodiment, the elastic arm 2062 is provided with a backstop protrusion 20621 and the backstop protrusion 20621 is located at the connection between the telescoping section 2061 and the rotating section 2063 and forms a bayonet with an end plane 1052 on the Yu Kazhu having a significantly smaller width.

The assembly can refer to embodiment 3, and will not be described again.

In the initial state, the left part of fig. 26 and the injection use can refer to embodiment 3, and the description thereof is omitted.

The injection needle enters self-destruction immediately after injection and is pulled out, the clamping column 105 of the needle cap 1 slides forwards along the telescopic section 2061 of the guide groove 206 of the needle seat 2 under the elastic force of the spring 3, and the needle cap 1 extends out and covers the front end of the needle tube 4, which is not obviously different from the embodiment 3. The difference is that the clip column 105 of the needle cap 1 does not slide forward to the passing opening formed by the clip-in section 2064 and the free end of the elastic arm 2062 under the action of the elastic force and torsion force of the spring 3, but slides forward to the bayonet formed by the elastic arm 2062 blocked at the communication position of the telescopic section 2061 and the rotating section 2063, when the clip column 105 passes the bayonet, the clip column 105 elastically deforms the elastic arm 2062 by pressing the check protrusion 20621, when the clip column 105 is clipped into the rotating section 2063, the elastic deformation of the elastic arm 2062 is recovered, the clip column 105 slides along the rotating section 2063, and the needle cap 1 rotates forward.

Finally, the self-destruct state of the present needle is seen in the right part of fig. 22. At this time, if the needle cap 1 is reversely rotated, the locking post 105 of the needle cap 1 is blocked by the non-return protrusion 20621 on the elastic arm 2062, and the locking post 105 is limited in the rotating section 2063 due to the end plane 1052 on the small width Yu Kazhu of the bayonet, so that the whole structure of the needle cap 1 covering the front end of the needle tube 4 is ensured to be stable.

Further, referring to fig. 27, a sheath (which may also be called a middle sheath or a clip) 5, which is common in the art, is provided outside the needle holder, and an outer sheath (which may also be called a housing or an outer needle cap) 6, which is common in the art, is provided outside the sheath 5, and the outer sheath 6 integrally protects the injection needle.

Example 5

The difference between this embodiment and embodiment 1 is that the shielding structure is disposed at both ends of the needle holder 2 in this embodiment, and referring to fig. 28 and 29, the lower guide groove 212, which is the same as the guide groove 206 of embodiment 1, is disposed at the tail of the needle holder 2, and the shielding structure is disposed at the tail of the needle holder 2.

The shielding structure at the tail of the needle seat 2 comprises a lower spring 7 and a needle tip shield 8, wherein the lower spring 7 and the needle tip shield 8 are assembled into the lower part of the needle seat 2 in sequence from top to bottom, and a lower clamping column 801 is arranged on the outer side wall of the needle tip shield 8.

Referring to fig. 30 and 31, the lower guide groove 212 is symmetrical to the guide groove 206 in front and back, the side wall of the tail of the needle holder 2 is provided with more than one lower guide groove 212, the lower guide grooves 212 are circumferentially and uniformly distributed on the side wall of the tail of the needle holder 2, the lower guide grooves 212 are in one-to-one correspondence and matched 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, the lower guide grooves 212 comprise lower telescopic sections 2121, lower elastic arms 2122 and lower rotating sections 2123, the lower telescopic sections 2121 extend along the axial direction of the needle holder 2 and provide guidance for the axial sliding of the lower clamping columns 801, the lower elastic arms 2122 are arranged in the lower telescopic sections 2121 and enclose the front part of one side of the corresponding reverse direction of the lower telescopic sections 2121 into a lower initial fixing position of the lower clamping columns 801, the lower elastic arms 2122 prevent the lower clamping columns 801 sliding forward from the lower initial fixing position of the lower clamping columns 801 from the lower initial position, the lower rotating sections 2123 extend forward along the direction of the telescopic sections 2122 and are in front and are communicated with the corresponding lower rotating sections 2123 of the lower clamping columns 801 as the fixing positions of the lower clamping columns 801.

As shown in fig. 32, the rear end of the needle tube 4 is matched with the needle tip shield 8 to stretch and retract so as to be shielded or exposed, and after the self-destruction state is started, the lower clamping column 801 enters the lower rotary section 2123 of the needle seat 2 along the lower stretching section 2121 and beyond the lower elastic arm 2122 under the action of the lower spring 7.

The side of the lower elastic arm 2122 may be provided with a structure similar to the inverted protrusion 20621 in embodiment 4, so that the lower clip 801 is limited in the lower rotating section 2123 under the inverted effect of the protrusion, and thus, the needle tip sheath 8 with limited movement and rotation forms a barrier to the needle tip, thereby achieving the purpose of safe self-destruction.

It should be noted that numerous variations and modifications are possible in light of the fully described invention, and are not limited to the specific examples of implementation described above. The above-described embodiments are merely illustrative of the present invention and are not intended to be limiting. In general, the scope of the present invention should include those variations or alternatives and modifications apparent to those skilled in the art.

Claims (21)

1. The safe needle-prick-preventing self-destroying injection needle head is characterized by comprising:

the needle cap is embedded at the front end of the needle seat, a through hole arranged along the axis is arranged at the front end of the needle cap, a first spring limiting structure is arranged at the inner side of the front end, and a clamping column is arranged on the outer side wall of the needle cap;

the needle seat 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 seat 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 seat, and two ends of the spring are respectively arranged on the first spring limit structure and the second spring limit structure;

a needle tube fixed in the needle tube fixing hole of the needle seat, and

The needle cap rotating non-return structure plays a role in preventing the needle cap from rotating reversely in the 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 fixing position of the guide groove of the needle seat, the spring is compressed and twisted to provide forward elastic force and forward rotating torsion force for the needle cap during assembly,

In the use process, the needle cap is contracted after being subjected to external force, the clamping column of the needle cap slides backwards 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, the spring is further compressed,

When in a self-destruction state, the needle cap stretches forwards to cover the front end of the needle tube under the action of the elasticity and torsion of the spring and rotates forwards, the clamping column of the needle cap slides to the self-destruction fixing position of the guide groove of the needle seat, and at the moment, the needle cap is prevented from rotating reversely by the needle cap rotating reverse stop structure.

2. The safety needle penetration resistant self-destructing injection needle of claim 1, wherein the first spring retention feature of the needle cap comprises:

The round table is coaxially arranged on the inner side of the front end of the needle cap, and the through hole is formed in the round table;

a first guide surface arranged on the rear end surface of the round table, and

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

The front end of the spring is sleeved on the round table, a first clamping hook formed by inwards bending the tail end of the spring wire is arranged at the front end of the spring, and the first clamping hook is clamped into the first spring clamping groove in a sliding mode along the first guide surface.

3. The needle tip of 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 clamping groove is disposed at the front end of the first guide surface.

4. The safety needle penetration resistant self-destructing injection needle of claim 1, in which the 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 two open 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 needle-pricking-preventing self-destroying injection needle according to claim 1, wherein the needle seat is cylindrical with two open ends, a diaphragm plate dividing the inner part into a front cavity and a rear cavity is arranged in the needle seat, a needle tube assembly base which is arranged along the axis and is connected with the diaphragm plate is arranged in the front cavity of the needle seat, and the needle tube assembly base is provided with the needle tube fixing hole and the second spring limiting structure.

6. The safety needle penetration resistant self-destructing injection needle of claim 5, wherein the second spring limiting structure of the hub 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;

a second guide surface 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, a second clamping hook formed by inwards bending the tail end of the spring wire is arranged at the rear end of the spring, and the second clamping hook is clamped into the second spring clamping groove in a sliding mode along the second guide surface.

7. The needle tip of claim 6, wherein the second guide surface is an arcuate concave surface extending in a circumferential direction and recessed rearward, and the second spring catch is disposed at a lowest recess of the second guide surface.

8. The needle of claim 1, wherein the torsion of the spring is generated by a circumferential angle between the ends of the spring wire at both ends being changed by a first spring limit structure of the cap and a second spring limit structure of the hub.

9. The needle tip of claim 8, wherein the circumferential angle between the ends of the spring wire at the two ends of the spring is changed from 180 ° to 90 ° by the first spring stop feature of the cap and the second spring stop feature of the hub.

10. The safety needle penetration-preventing self-destructing injection needle according to any one of claims 1-9, characterized in that the guiding groove of the needle seat comprises:

a telescoping section extending axially;

An elastic arm arranged in the telescopic section and surrounding the front part of one side of the telescopic section corresponding to the reverse direction into an initial area, and

The rotating section extends along the forward direction and is communicated with the front part of the other side of the telescopic section, which corresponds to the forward direction;

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

The guide groove is arranged on the inner side wall of the needle seat, the front end of the guide groove extends to the front end face of the needle seat, the rear end of the guide groove extends to the initial area, and the guide groove guides the clamping column of the needle cap, so that the clamping column is smoothly clamped into the initial area.

11. The safety needle penetration resistant self-destructing injection needle of claim 10, in which the cap rotation check comprises:

A check bump disposed on the outer side wall of the needle cap, and

The backstop block is arranged on the inner side wall of the needle seat;

And in the process of forward rotation of the needle cap, the backstop lug passes through the backstop block to form a lock catch for preventing the needle cap from rotating reversely.

12. The safe needling-preventing self-destroying injection needle according to claim 10, further comprising a sheath which is sleeve-shaped and is sleeved outside the needle seat;

the needle cap rotation backstop structure includes:

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

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

The backstop elastic arm is arranged on the side wall of the sheath and inclines towards the axial direction relative to the inner side wall of the sheath;

Wherein in the initial state, the backstop clamping groove and the backstop elastic arm are staggered in the circumferential direction, the backstop elastic arm is positioned in the avoidance groove, the front end of the backstop elastic arm is propped against the outer side wall of the needle cap,

In the self-destruction state, the non-return elastic arm corresponds to and is clamped into the non-return clamping groove in the circumferential direction to form a lock catch for preventing the needle cap from rotating reversely.

13. The safe needle-pricking-preventing self-destroying injection needle according to claim 12, wherein the outer side wall of the needle seat is provided with an axially extending convex rib, the inner side wall of the sheath is provided with an axially extending groove, and the needle seat and the sheath are tightly assembled through the cooperation of the convex rib and the groove.

14. The needle of any one of claims 11-13, wherein in an initial state, the cap extends forward to cover the forward end of the needle cannula.

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

16. The safety needle penetration-preventing self-destructing injection needle according to any one of claims 1-9, characterized in that the guiding groove of the needle seat comprises:

a telescoping section extending axially;

the clamping section is communicated with the front part of one side of the telescopic section, which corresponds to the reverse direction, and the front end of the clamping section extends to the front end surface of the needle seat so as to be clamped by a clamping column of the needle cap;

the initial section is communicated with the rear part of the other side of the telescopic section, which corresponds to the forward direction;

a rotary section communicating with the front of the other side of the telescopic section in the corresponding forward direction, and

The elastic arm is used for blocking the front end of the telescopic section, the suspension end of the elastic arm extends into the clamping section, and a passing port with the width of Yu Kazhu is formed in the clamping section;

The initial 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 penetration resistant self-destructing injection needle of claim 16, in which the cap rotation check comprises:

A latch arranged on the side surface of the latch post of the needle cap, and

The inverted latch is arranged in the rotating section;

And in the process that the needle cap rotates positively and the clamping column of the needle cap slides along the rotating section, the clamping teeth pass through the inverted clamping teeth to form a lock catch for preventing the needle cap from rotating reversely.

18. The safety needle penetration resistant self-destructing injection needle of claim 16, in which the cap rotation check comprises:

An end plane arranged at the back side of the side face of the clamping column of the needle cap, and

The backstop bulge is arranged on the elastic arm, and the backstop bulge enables the communicating part of the telescopic section and the rotating section to form a bayonet with the width smaller than the end plane;

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

19. The safety needle-stick self-destructing injection needle of claim 18, further comprising:

a sheath sleeve-shaped and sleeved outside the needle seat, and

And the outer protective sleeve is sleeved on the outer side of the protective sleeve.

20. The safety needle-punching-prevention self-destruction 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 seat and below the spring;

The needle point shield is positioned below the lower spring and embedded at the tail end of the needle seat, and the outer side wall of the needle point shield is provided with a lower clamping column;

wherein, in the initial state, the needle tip sheath retreats, the lower clamping post is positioned at the initial fixed position of the lower guiding groove of the needle seat, the lower spring is compressed and twisted to provide backward elasticity and forward rotating torsion for the needle tip sheath during assembly,

In the use process, the needle tip sheath is pressed forwards by external force, the lower clamping column slides forwards along the lower guide groove,

When in a self-destruction state, the needle tip shield retreats to cover the tail end of the needle tube under the action of the elasticity and torsion of the lower spring and rotates forward, and the lower clamping column slides to the self-destruction fixing position of the lower guide groove.

21. The safety needle penetration resistant self-destructing injection needle of claim 20 in which the lower guide slot includes:

a lower telescoping section extending axially;

A lower elastic arm arranged in the lower telescopic section and enclosing the tail of one side of the lower telescopic section corresponding to the reverse direction into a lower initial area, and

The lower rotating section extends along the forward direction and is communicated with the tail part of the other side of the lower telescopic section, which corresponds to the forward direction;

The lower initial region is used as an initial fixing position of the lower clamping column, the lower elastic arm prevents the lower clamping column sliding forward from the lower initial region from entering the lower initial region, and the lower rotating section is used as a self-destruction fixing position of the lower clamping column.