CN212817494U

CN212817494U - Needle head structure and syringe with same

Info

Publication number: CN212817494U
Application number: CN202021826083.7U
Authority: CN
Inventors: 杨德怡
Original assignee: Shantou Wealy Medical Instrument Co Ltd
Current assignee: Shantou Wealy Medical Instrument Co Ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2021-03-30
Anticipated expiration: 2030-08-27

Abstract

The utility model provides a syringe needle structure and have its syringe, the syringe needle structure includes: the mounting seat is provided with a mounting cavity and a first connecting part, and is detachably connected with a second connecting part of the shell of the injector through the first connecting part; the liquid passing core is used for mounting the needle head and penetrates through the mounting cavity; the liquid-proof piece is arranged between the inner wall of the mounting cavity and the outer wall of the liquid-through core so as to seal the mounting seat and the liquid-through core through the liquid-proof piece; wherein, prevent the spacing cooperation of liquid spare and logical liquid core to will lead to the liquid core location on the mount pad through preventing the liquid spare, and make lead to the liquid core and prevent liquid spare and mount pad and break away from so that the syringe needle retraction shell under the effect of external force in. The needle head structure solves the problem that the needle head of the injector in the prior art is exposed and easily stabs workers.

Description

Needle head structure and syringe with same

Technical Field

The utility model relates to the field of medical equipment, particularly, relate to a syringe needle structure and have its syringe.

Background

A syringe is one of the most basic medical devices.

At present, the common disposable syringes generally have the defects of reusability, no safety device, exposed needle tubes after injection and the like.

After the disposable syringe is used, the needle of the syringe is easy to stab medical staff during the collection and treatment process.

SUMMERY OF THE UTILITY MODEL

The main object of the utility model is to provide a syringe needle structure and have its syringe to solve the syringe needle of the syringe among the prior art and expose the problem of stabbing staff easily.

In order to achieve the above object, according to an aspect of the present invention, there is provided a needle structure including: the mounting seat is provided with a mounting cavity and a first connecting part, and is detachably connected with a second connecting part of the shell of the injector through the first connecting part; the liquid passing core is used for mounting the needle head and penetrates through the mounting cavity; the liquid-proof piece is arranged between the inner wall of the mounting cavity and the outer wall of the liquid-through core so as to seal the mounting seat and the liquid-through core through the liquid-proof piece; wherein, prevent the spacing cooperation of liquid spare and logical liquid core to will lead to the liquid core location on the mount pad through preventing the liquid spare, and make lead to the liquid core and prevent liquid spare and mount pad and break away from so that the syringe needle retraction shell under the effect of external force in.

Further, the first connecting part is in threaded connection with the second connecting part; or the first connecting part and the second connecting part are mutually clamped.

Further, the second connecting portion is an internal thread, and the first connecting portion is an external thread matched with the internal thread, so that the first connecting portion and the second connecting portion are in threaded connection.

Furthermore, the liquid-proof piece is annular, and the liquid-proof piece is installed on the mounting seat and sleeved on the outer side of the liquid passing core.

Furthermore, a stop flange is arranged on the outer wall of the liquid passing core, and the stop flange is in limit fit with the liquid-proof piece so as to position the liquid passing core on the mounting seat; at least part of the liquid-proof member is telescopically arranged, and when the liquid-proof member is separated from the liquid-proof member due to external force, the stop flange is compressed and passes through the liquid-proof member, so that the liquid-proof member retracts towards the inside of the shell.

Furthermore, lead to liquid core and have the first locking part with the locking cooperation of the second locking part in the shell to through the locking cooperation between first locking part and the second locking part, make the second locking part drive lead to liquid core and retract towards the shell.

Further, the liquid passing core is provided with a fluid channel for fluid to pass through, the first locking part is a locking groove arranged in the fluid channel, and at least part of the second locking part is clamped into the locking groove to be in locking fit with the locking groove.

Further, the second locking portion is a ball head portion, and the inner wall surface of the locking groove is at least part of a spherical surface matched with the ball head portion.

Furthermore, the locking grooves are multiple and are sequentially arranged along the extending direction of the fluid channel.

Further, the mount pad includes first seat body portion and the second seat body portion of interconnect, and first connecting portion set up in the outside of first seat body portion, is provided with the throat portion on the second seat body portion, leads to being provided with on the liquid core with the spacing complex spacing step of throat portion.

Further, along the retracting direction of the liquid passing core, the liquid passing core comprises a second core section and a third core section which are sequentially connected, an elastic groove is formed in the third core section, and the elastic groove extends from the free end of the third core section to the second core section, so that the third core section is elastically deformed under the action of the elastic groove.

According to another aspect of the present invention, there is provided an injector, comprising a needle tube structure and a needle head structure installed on the needle tube structure, wherein the needle head structure is the above-mentioned needle head structure.

The utility model provides a needle head component, the detachable mount pad has been set up at traditional needle tube shell front end, the mount pad is provided with first connecting portion, be provided with the second connecting portion on the needle tube shell, the mount pad is connected with the second connecting portion on the needle tube shell through first connecting portion to fix the mount pad on the needle tube shell, the mount pad sets up to the structure of taking the cavity to constitute the installation cavity inside; a liquid passing core penetrates through the mounting cavity of the mounting seat and is used for mounting a needle head, and liquid in the needle tube can be input into the needle head through the liquid passing core so as to complete injection; be provided with between the installation cavity inner wall of mount pad and the outer wall of logical liquid core and prevent liquid spare, prevent that liquid spare fixed mounting is in installation cavity inner wall to with lead to spacing cooperation of liquid core. The liquid-proof piece is used for fixing the liquid-through core on the mounting seat and preventing liquid in the needle tube from permeating into the mounting cavity of the mounting seat. In addition, when the liquid passing core is acted by external force and moves along the axial direction of the shell to the outer side of the mounting cavity, the liquid passing core can be separated from the liquid-proof piece so as to drive the needle head to retract into the needle tube shell. Therefore, the needle can be prevented from stabbing workers, and the problem that the workers are easily stabbed due to the fact that the needle of the injector in the prior art is exposed is solved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a needle structure of the present invention mounted on a housing of an injector;

FIG. 2 shows an assembled schematic view of an embodiment of the needle tip structure of the present invention;

figure 3 shows a schematic structural view of the housing of the syringe of the present invention;

FIG. 4 shows a top view of the housing of the syringe of FIG. 3;

fig. 5 shows a schematic structural view of the mounting seat of the needle structure of the present invention;

FIG. 6 shows a cross-sectional view of the mounting cup of the needle structure shown in FIG. 5;

FIG. 7 shows a cross-sectional view of the wick of the needle structure of the present invention;

fig. 8 is a schematic structural view of the liquid passing core of the needle head structure of the present invention;

FIG. 9 is a schematic view of the syringe needle structure of the present invention retracted into the housing of the syringe;

figure 10 shows a schematic view of the needle structure of the syringe of the present invention in an initial state; and

figure 11 shows a block diagram of the seal of the syringe of the present invention.

Wherein the figures include the following reference numerals:

1. a mounting seat; 11. a mounting cavity; 12. a first connection portion; 13. a first seat portion; 14. a second seat portion; 141. a necking part; 2. a housing; 21. a second connecting portion; 22. a second locking portion; 3. a liquid core is communicated; 31. a stop flange; 32. a first locking portion; 321. a locking groove; 33. a fluid channel; 34. a limiting step; 35. a first core segment; 36. a second core segment; 37. A third core segment; 371. an elastic groove; 4. a liquid-proof member; 5. a hollow push rod; 51. a stopper portion; 6. a seal member; 61. a step; 62. a protrusion; 63. locking; 65. a hemispherical structure; 7. a piston; 8. a spring; 9. a safety plug; 91. a hemispherical head; 92. a groove; 93. double-flanged.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The utility model provides a syringe needle structure, refer to fig. 1 to 11, this syringe needle structure includes: the mounting structure comprises a mounting seat 1, wherein a mounting cavity 11 and a first connecting part 12 are arranged on the mounting seat 1, and the mounting seat 1 is detachably connected with a second connecting part 21 of a shell 2 of the injector through the first connecting part 12; the liquid passing core 3 is used for installing a needle head, and the liquid passing core 3 penetrates through the installation cavity 11; the liquid-proof piece 4 is arranged between the inner wall of the mounting cavity 11 and the outer wall of the liquid-through core 3, so that the space between the mounting seat 1 and the liquid-through core 3 is sealed through the liquid-proof piece 4; wherein, prevent liquid 4 with lead to the spacing cooperation of liquid core 3 to through preventing that liquid 4 will lead to liquid core 3 location on mount pad 1, and make and lead to liquid core 3 and prevent liquid 4 and mount pad 1 and break away from so that the syringe needle retraction shell 2 in under the effect of external force.

The first connection mode for connecting the first connection portion 12 and the second connection portion 21 in this embodiment is as follows:

as shown in fig. 1, the first connection portion 12 is screwed with the second connection portion 21.

Specifically, the second connection portion 21 is an internal thread, and the first connection portion 12 is an external thread that is matched with the internal thread, so that the first connection portion 12 and the second connection portion 21 are screwed. The combination structure is simple, the cost is low, and the processing is easy.

The second connection manner for connecting the first connection portion 12 and the second connection portion 21 in this embodiment is as follows:

the first connection portion 12 and the second connection portion 21 are engaged with each other.

Specifically, a bayonet portion is provided on the first connecting portion 12, the second connecting portion 21 is a bayonet portion, and the bayonet portion is clamped into the bayonet portion to realize the bayonet connection between the first connecting portion 12 and the second connecting portion 21.

Adopt above-mentioned two kinds of connected modes, first connecting portion on the mount pad and second connecting portion on the mount pad can adopt threaded connection or mutual joint promptly, and installation, dismantlement are convenient. When the needle tube is used for injection, the mounting seat and the shell can be firmly connected.

In this embodiment, the liquid-proof member 4 is ring-shaped, and the liquid-proof member 4 is installed on the mounting base 1 and sleeved outside the liquid-passing core 3.

In order to realize the mount pad and lead to the sealed and fixed effect between the liquid core, will prevent that liquid spare 4 is cyclic annular, can laminate with leading to the liquid core better, will prevent that liquid spare 4 dress is at mount pad 1, make and prevent 1 fixed connection of liquid spare 4 mount pad, will prevent that the inner ring cover of liquid spare 4 establishes on leading to the liquid core, on the one hand can effectually play when the needle tubing injects and prevent the effect of liquid seal, on the other hand when leading to the liquid core and receive the exogenic action when to the shell internalization, because of preventing that the one end of liquid spare is fixed on the shell, can not break away from the shell along with the motion of leading to the liquid core, thereby more effective assurance prevent that liquid spare drives the effect in the syringe needle withdrawal shell.

As shown in fig. 7, a stop flange 31 is arranged on the outer wall of the liquid passing core 3, and the stop flange 31 is in limit fit with the liquid-proof member 4 to position the liquid passing core 3 on the mounting seat 1; at least part of the liquid-proof member 4 is telescopically arranged, and when the liquid-permeable core 3 is subjected to an external force to be separated from the liquid-proof member 4, the stopper flange 31 is compressed and passes through the liquid-proof member 4 to retract the liquid-permeable core 3 toward the inside of the housing 2.

In the application, the stop flange 31 is arranged on the liquid passing core 3, so that the contact area between the liquid passing core 3 and the liquid-proof piece 4 is increased, and the sealing effect of preventing liquid leakage can be better achieved; the liquid-proof part 4 is in limit fit with the stop flange 31, so that when the liquid-passing core is not acted by external force, the liquid-passing core 3 can be prevented from passing through the liquid-proof part 4, and the liquid-passing core 3 is fixed in the installation cavity 11 of the installation seat 1; the setting of backstop flange 31 should ensure to lead to liquid core 3 when receiving exogenic action and preventing that liquid 4 breaks away from, the backstop flange can cross and prevent liquid 4 to accomplish and lead to liquid core 3 and drive the inside effect of syringe needle retraction shell 2.

In the present embodiment, the liquid passing core 3 has a first locking portion 32 which is in locking engagement with a second locking portion 22 in the housing 2, so that the second locking portion 22 brings the liquid passing core 3 to retract towards the housing 2 through the locking engagement between the first locking portion 32 and the second locking portion 22.

In order to achieve retraction of the liquid passing core 3, as shown in fig. 7, the liquid passing core 3 has a fluid passage 33 for fluid communication, the first locking portion 32 is a locking groove 321 provided in the fluid passage 33, and at least a portion of the second locking portion 22 is caught in the locking groove 321 to be lockingly engaged with the locking groove 321.

In the application, a first locking part is arranged on the liquid passing core 3, and a second locking part 22 which is in locking fit with the first locking part 32 is arranged on the shell 2; at first, first locking portion and second locking portion are in the separation state, and when injecting, the effect of second locking portion on the shell through the external force, with lead to the locking cooperation of first locking portion on the liquid core, first locking portion after the locking cooperation can move under the effect of external force along with second locking portion, makes to lead to the liquid core can shake off the limiting displacement who prevents the liquid spare to reach and lead to the effect that the liquid core drove the syringe needle and withdraw in the shell.

In this application, set up the fluid passage that supplies the fluid to pass through on leading to the liquid core to guarantee to lead to the liquid core with required injection and follow the leading-in syringe needle in the needle tubing, set up the second locking portion of locking groove and casing in fluid passage and lock the cooperation, simple structure sets up the locking groove, when guaranteeing that the fluid switches on, can reach the effect that leads to the liquid core and drive the syringe needle and withdraw the shell simultaneously.

In the present embodiment, the second locking portion 22 is a ball portion, and the inner wall surface of the locking groove 321 is at least part of a spherical surface that fits with the ball portion.

In this application, set up second locking portion on the shell into bulb portion, the resistance that receives when can reduce second locking portion and get into the locking groove, the locking groove of bulb shape can increase the area of contact of first locking portion and second locking portion, it is inseparabler to make the locking cooperation, the internal face of locking groove sets up to the at least part with the head matched with sphere of second locking portion, make second locking portion when getting into the locking inslot, the internal face of locking groove can laminate in the at least part of second locking portion, thereby accomplish the locking effect, make logical liquid core drive syringe needle retract into the shell.

In the present embodiment, the locking groove 321 is plural, and the plural locking grooves 321 are sequentially arranged along the extending direction of the fluid passage 33.

In this application, set up a plurality of locking grooves along the fluid passage interval, make full use of fluid passage's length, when leading to on the liquid core a locking groove not with the shell on the second connecting portion accomplish the locking cooperation, the second connecting portion can continue inside movement along the fluid passage, until accomplishing the locking cooperation with another one locking groove to drive and lead to the liquid core and break away from liquid-proof spare, make and lead to the liquid core and drive the syringe needle retraction shell.

In this embodiment, the mounting seat 1 includes a first seat portion 13 and a second seat portion 14 connected to each other, the first connecting portion 12 is disposed outside the first seat portion 13, the second seat portion 14 is provided with a reducing portion 141, and the liquid passing core 3 is provided with a limiting step 34 in limiting fit with the reducing portion 141.

In the application, the mounting seat comprises a first seat body part and a second seat body part which are mutually connected, the first seat body part is arranged on the outer side of the second seat body part, a necking part is arranged on the second seat body part, a limiting step which is in limiting fit with the necking part is arranged on the liquid passing core, and the necking part limits the liquid passing core in a mounting cavity of the mounting seat through the limiting step; under the combined action of the limiting fit of the necking part and the limiting table and the limiting fit of the stop flange and the liquid-proof piece, the position of the liquid-through core is limited, so that the liquid-through core is stably arranged in the mounting cavity under the condition that the liquid-through core is not under the action of external force.

In the present embodiment, the liquid passing core 3 includes the first core section 35, the second core section 36 and the third core section 37 connected in series in the retracting direction of the liquid passing core 3, and the third core section 37 is provided with the elastic groove 371, and the elastic groove 371 extends from the free end of the third core section 37 toward the second core section 36, so that the third core section 37 is elastically deformed by the elastic groove 371.

In this application, along the withdrawal direction of logical liquid core, lead to the liquid core including the first core section second core section and the third core section that connect gradually, be provided with the elastic groove on the third core section. When the second locking portion on the housing enters the locking slot, the resilient slot may cause the third core section to expand, causing the second locking portion to snap into the resilient slot, the resilient slot extending from the free end of the third core section towards the second core section, such that the third core section is resiliently deformed under the action of the resilient slot. The third core section generates resilience force after being deformed, and counteracts the elastic groove to enable the locking groove to contract inwards, so that the locking groove can lock the second locking part.

The utility model discloses a syringe, including needle tubing structure and the syringe needle structure of installing on the needle tubing structure, the syringe needle structure is above-mentioned syringe needle structure.

The structure of the needle in this embodiment is described in detail below with reference to the accompanying drawings:

as shown in fig. 1, 2, 3, 4, 5, and 6, the mounting seat 1 is connected to the housing 2 by a screw thread, the first seat portion 13 of the mounting seat 1 is connected to an outlet position of the housing 2, the second seat portion 14 of the mounting seat 1 is installed in the first seat portion 13, the first seat portion 13 has a mounting cavity 11 therein, the liquid-permeable core 3 is inserted into the mounting cavity 11, the outlet position of the first seat portion 13 is provided with a necking portion 141, the liquid-permeable core 3 is provided with a limiting step 34 in limiting fit with the necking portion 141, the inner wall of the mounting cavity 11 is fixed with a liquid-proof member 4, the liquid-proof member 4 is annular, the outer wall of the liquid-permeable core 3 is provided with a stopping flange 31, and the stopping flange 31 is in limiting fit with the liquid-proof member 4 to position the liquid-permeable core 3 in the mounting cavity 11; when liquid core 3 receives external force and liquid-proof piece 4 breaks away from, backstop flange 31 surpasss liquid-proof piece 4 so that liquid core 3 contracts towards the inside of shell 2, installs the syringe needle in the liquid core 3 for export the liquid in the syringe needle to the human body.

As shown in fig. 1, fig. 7 and fig. 8, the first locking portion 32 with a bulb shape is arranged on the liquid passing core 3, the first locking portion 32 with a bulb shape is arranged on the housing 2, in an initial state, the first locking portion 32 and the second locking portion 22 are in a separated state, when injection is performed, the second locking portion 22 on the housing 2 moves and contacts towards the first locking portion 32 of the mounting base 1 under the action of external force, and is in locking fit with the first locking portion 32, the first locking portion after locking fit can move towards the housing 2 under the action of external force along with the second locking portion 22, so that the liquid passing core 3 can break away the limiting effect of the liquid-proof member 4, and the liquid passing core 3 is driven to retract into the housing 2.

As shown in fig. 1, 8, 9, 10, in the retracting direction of the liquid passing core 3, the liquid passing core 3 includes a first core section 35, a second core section 36 and a third core section 37 connected in series, the third core section 37 is provided with an elastic groove 371, and the elastic groove 371 extends from the free end of the third core section 37 toward the second core section 36; during injection, the second locking part 22 is pressed into the fluid channel 33 of the liquid passing core 3 under the action of external force, the bulb-shaped second locking part 22 is pressed into the locking groove 321, the third core section 37 expands due to the pressing of the second locking part 22 and generates elastic deformation under the action of the elastic groove 371, and the resilience force generated by the deformed third core section reacts on the locking groove 321 to enable the locking groove 321 and the second locking part 22 to be tightly attached to complete locking; the plurality of locking grooves 321 are sequentially arranged in the extending direction of the fluid passage 33, when the second locking part 22 is pressed into the outermost locking groove 321, the second locking part can continue to move in the fluid passage 33 to get over the outer locking groove 321 and enter the inner locking groove 321, and at this time, the third core segment can generate larger elastic deformation to bring larger resilience, so that the locking of the locking groove 321 and the second locking part 22 is firmer.

As shown in fig. 10, after the medical staff completes the infusion, the locking groove 321 of the liquid passing core 3 is locked and matched with the second locking portion 22 of the housing 2, the second locking portion 22 retracts into the housing 2 under the action of external force, the first locking portion 32 locked and matched with the second locking portion 22 drives the liquid passing core 3 to disengage from the liquid-proof member 4 and retract into the housing 2, and the needle is fixed on the liquid passing core 3 and retracts into the housing 2 along with the liquid passing core 3.

In addition, the utility model discloses still protect a syringe that has this syringe needle subassembly, as shown in fig. 10 fig. 11, specifically as follows:

the syringe comprises a housing 2 and a hollow plunger 5. The hollow push rod 5 is arranged in the inner hole of the shell 2, and the injector further comprises: and a sealing piece 6, wherein the sealing piece 6 is arranged at the front end of the hollow push rod 5. The front end of the sealing member 6 is provided with a second locking portion 22. The rear end of the sealing element 6 is provided with a hemispherical structure 65; the liquid passing core 3 is arranged in the mounting seat 1 and provides a channel for liquid to flow and be injected into muscle of a human body when being pressed, and the liquid passing core 3 is a key component of the injector. The liquid passing core 3 is installed and locked at the center of the installation seat 1, and the liquid preventing part 4 is installed at the position separated between the liquid passing core 3 and the installation seat 1 to prevent liquid leakage. The mounting 1 is locked to the upper end of the housing 2.

The center of the hollow pushrod 5 is fitted with a seal 6 and positioned at hydrostatic pressure. The front end of the hollow push rod 5 is provided with a spring 8 which is in a static pressure state on the premise of not being pressed; the front end of the hollow push rod 5 is also provided with a piston 7, the piston 7 is matched with the shell 2, and the hollow push rod 5 is arranged in the shell 2. When the hollow push rod 5 is pushed, liquid in the shell 2 is pressed to generate high pressure through the liquid passing core 3 and is injected into a human body, the liquid passing core 3 releases elasticity when the spring 8 is pressed, and together with the sealing piece 6 and the liquid passing core 3, the liquid passing core and the sealing piece retract into the hollow push rod 5 to be self-destructed, and the safety plug 9 is locked. The utility model can prevent the spread of infectious diseases such as hepatitis B, hepatitis C, AIDS and the like caused by the easy puncture injury of the needle when the needle is exposed for use, thereby achieving the purposes of protecting the personal safety of nurses and preventing the social harm caused by the spread infection of secondary diseases.

The inner wall of the hollow push rod 5 is provided with a stopping part 51, the stopping part 51 is of a blade structure, the spring 8 generates releasing elasticity when the hollow push rod 5 is pushed, and the sealing element 6 and the liquid passing core 3 are locked in the hollow push rod 5 together, so that the self-destruction purpose is achieved. The semi-spherical structure 65 can enable the sealing element 6 to enter the stopping part 51 more smoothly, the front end of the hollow push rod 5 is provided with a concave groove, and the rear end of the hollow push rod 5 is provided with a safety plug 9 for achieving locking for the second time when self-destruction fails.

The central liquid through hole of the liquid through core 3 is provided with a fluid channel 33, the fluid channel 33 is a spiral channel, and the spiral channel comprises a plurality of spiral sections, wherein the spiral angle of one spiral section is 36 degrees, and the spiral angle of the spiral section in the middle part is 22 degrees. The end of the fluid channel 33 close to the sealing member is of a gourd-shaped configuration, and the locking groove is part of the gourd-shaped configuration. When liquid is injected under pressure, high pressure is generated to inject into a human body when the liquid passes through the liquid passing core 3.

The mounting base 1 is in threaded connection with the shell 2, cannot be separated from the shell 2 when high pressure is generated, and is tightly locked on the shell 2.

The sealing member 6 is provided with a plurality of protrusions 62 and steps 61 to prevent the liquid from being separated when high pressure is generated, and is installed at the front end of the hollow push rod 5. The front end of the sealing element 6 is provided with a second locking part, the rear end of the sealing element 6 is provided with a hemispherical structure 65, the sealing element 6 is self-destructed when retracting in the hollow push rod 5 through a blade structure arranged on the inner side of the shell 2, the sealing element 6 is also provided with a lock catch 63 at the lower end, and the lock catch 63 of the sealing element 6 can also be repaired and locked at the rear end of the hollow push rod 5 when the stopping part 51 is not self-destructed.

The top end of the safety plug 9 is provided with a hemispherical head 91, a groove 92 is arranged below the hemispherical head 91, and the lower end of the groove 92 is provided with a double flange 93 for interference fit with the rear end of the hollow push rod 5.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

after the medical staff injects, the needle assembly can retract the needle into the shell after the medical staff injects, so that the needle cannot stab the medical staff.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A needle structure, comprising:

the mounting structure comprises a mounting seat (1), wherein a mounting cavity (11) and a first connecting part (12) are arranged on the mounting seat (1), and the mounting seat (1) is detachably connected with a second connecting part (21) of a shell (2) of the injector through the first connecting part (12);

the liquid passing core (3), the liquid passing core (3) is used for installing a needle head, and the liquid passing core (3) is arranged in the installation cavity (11) in a penetrating mode;

the liquid-proof piece (4) is arranged between the inner wall of the mounting cavity (11) and the outer wall of the liquid passing core (3) so as to seal the space between the mounting seat (1) and the liquid passing core (3) through the liquid-proof piece (4);

the liquid-proof piece (4) is in limit fit with the liquid-passing core (3) so as to position the liquid-passing core (3) on the mounting seat (1) through the liquid-proof piece (4), and the liquid-passing core (3) is separated from the liquid-proof piece (4) and the mounting seat (1) under the action of external force so as to enable the needle to retract into the shell (2).

2. A needle tip structure according to claim 1,

the first connecting part (12) is in threaded connection with the second connecting part (21); or

The first connecting portion (12) and the second connecting portion (21) are clamped with each other.

3. A needle construction according to claim 1, characterised in that the second connecting portion (21) is an internal thread and the first connecting portion (12) is an external thread cooperating with the internal thread to screw the first and second connecting portions (12, 21).

4. A needle structure according to claim 1, characterized in that the liquid-proof member (4) is ring-shaped, and the liquid-proof member (4) is mounted on the mounting base (1) and sleeved outside the liquid-through core (3).

5. A needle structure according to claim 1, characterized in that a stop flange (31) is arranged on the outer wall of the liquid passing core (3), and the stop flange (31) is in limit fit with the liquid-proof member (4) to position the liquid passing core (3) on the mounting seat (1); at least part of the liquid-proof member (4) is telescopically arranged, and when the liquid-permeable core (3) is subjected to external force to be separated from the liquid-proof member (4), the stop flange (31) is compressed and passes through the liquid-proof member (4) so that the liquid-permeable core (3) is retracted towards the inside of the shell (2).

6. A needle arrangement according to claim 1, characterized in that the wick (3) has a first locking portion (32) which lockingly engages a second locking portion (22) in the housing (2), such that the second locking portion (22) brings the wick (3) back towards the housing (2) by the locking engagement between the first locking portion (32) and the second locking portion (22).

7. A needle construction according to claim 6, characterised in that the wick (3) has a fluid passage (33) for fluid communication, the first locking portion (32) being a locking groove (321) provided in the fluid passage (33), at least part of the second locking portion (22) snapping into locking engagement with the locking groove (321).

8. A needle arrangement according to claim 7, characterised in that the second retaining portion (22) is a bulbous head portion and the inner wall surface of the retaining recess (321) is at least part of a spherical surface which mates with the bulbous head portion.

9. A needle structure according to claim 7, characterized in that said locking groove (321) is plural, and plural locking grooves (321) are provided in sequence in the extending direction of said fluid passage (33).

10. A needle structure according to claim 1, characterized in that the mounting seat (1) comprises a first seat part (13) and a second seat part (14) which are connected with each other, the first connecting part (12) is arranged at the outer side of the first seat part (13), a necking part (141) is arranged on the second seat part (14), and a limit step (34) which is in limit fit with the necking part (141) is arranged on the liquid passing core (3).

11. A needle structure according to claim 1, characterized in that in the retraction direction of the wick (3), the wick (3) comprises a first core segment (35), a second core segment (36) and a third core segment (37) connected in series, the third core segment (37) is provided with an elastic groove (371), the elastic groove (371) extends from the free end of the third core segment (37) towards the second core segment (36), so that the third core segment (37) is elastically deformed by the elastic groove (371).

12. An injector comprising a barrel structure and a needle structure mounted on the barrel structure, the needle structure being as claimed in any one of claims 1 to 11.