Needle structure and syringe having the same

Abstract

The present invention provides a needle structure and a syringe having the same, wherein the needle structure comprises: a mounting seat, on which a mounting cavity and a first connecting portion are provided, and the mounting seat is detachably connected to a second connecting portion of a housing of the syringe through the first connecting portion; a liquid core, which is used to mount the needle and is inserted into the mounting cavity; a liquid-proof member, which is provided between the inner wall of the mounting cavity and the outer wall of the liquid core, so as to seal the mounting seat and the liquid core through the liquid-proof member; wherein the liquid-proof member cooperates with the liquid core in a limiting manner, so as to position the liquid core on the mounting seat through the liquid-proof member, and the liquid core is separated from the liquid-proof member and the mounting seat under the action of an external force so as to retract the needle into the housing. The needle structure solves the problem that the needle of the syringe in the prior art is exposed and easily stabs the staff.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a needle structure and a syringe having the same. Background Art

[0002] The syringe is a basic medical device. In order to reduce the spread of blood-borne diseases among patients, countries around the world have enacted laws to enforce the use of disposable safety syringes.

[0003] At present, common disposable syringes generally have defects such as being reusable, having no safety devices, and the needle being exposed after injection. On the one hand, they are easily exploited by criminals or drug addicts. On the other hand, reusing syringes that were originally meant to be used once can easily lead to virus transmission and cross infection.

[0004] After the use of disposable syringes, the needles of the syringes can easily injure medical staff during the collection and processing process, leading to the spread of diseases such as hepatitis B, hepatitis C, and AIDS, and causing infection among medical staff. Nurses and waste collectors in various countries have been stabbed by exposed syringe needles. Summary of the invention

[0005] The main purpose of the present invention is to provide a needle structure and a syringe having the same, so as to solve the problem that the needle of the syringe in the prior art is exposed and easily stabs the staff.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a needle structure is provided, the needle structure comprising: a mounting seat, a mounting cavity and a first connecting portion are provided on the mounting seat, and the mounting seat is detachably connected to the second connecting portion of the housing of the syringe through the first connecting portion; a liquid-passing core, the liquid-passing core is used to install the needle, and the liquid-passing core is inserted into the mounting cavity; a liquid-proof component, the liquid-proof component is provided between the inner wall of the mounting cavity and the outer wall of the liquid-passing core, so as to seal the mounting seat and the liquid-passing core through the liquid-proof component; wherein the liquid-proof component cooperates with the liquid-passing core to limit the liquid-passing core, so as to position the liquid-passing core on the mounting seat through the liquid-proof component, and the liquid-passing core is separated from the liquid-proof component and the mounting seat under the action of external force so that the needle can be retracted into the housing.

[0007] Further, the first connection portion is threadedly connected to the second connection portion; or the first connection portion and the second connection portion are clamped to each other.

[0008] Furthermore, the second connection part is an internal thread, and the first connection part is an external thread matching the internal thread, so that the first connection part and the second connection part are threadedly connected.

[0009] Furthermore, the liquid-proof component is annular, and is mounted on the mounting seat and sleeved on the outer side of the liquid-passing core.

[0010] Furthermore, a stop flange is provided on the outer wall of the liquid-through core, and the stop flange cooperates with the liquid-proof part to limit the liquid-through core on the mounting seat; at least part of the liquid-proof part is retractably arranged, and when the liquid-through core is subjected to external force to separate from the liquid-proof part, the stop flange is compressed and passes through the liquid-proof part to retract the liquid-through core toward the interior of the outer shell.

[0011] Furthermore, the liquid-permeable core has a first locking portion that is locked with a second locking portion in the shell, so that the second locking portion drives the liquid-permeable core to retract toward the shell through the locking cooperation between the first locking portion and the second locking portion.

[0012] Furthermore, the liquid-passing core has a fluid channel for fluid circulation, the first locking portion is a locking groove arranged in the fluid channel, and at least a portion of the second locking portion is inserted into the locking groove to be locked with the locking groove.

[0013] Furthermore, the second locking portion is a ball head portion, and the inner wall surface of the locking groove is at least a portion of a spherical surface that matches the ball head portion.

[0014] Furthermore, there are multiple locking grooves, and the multiple locking grooves are arranged in sequence along the extension direction of the fluid channel.

[0015] Furthermore, the mounting seat includes a first seat body and a second seat body connected to each other, the first connecting portion is arranged on the outer side of the first seat body, the second seat body is provided with a necking portion, and the liquid passing core is provided with a limiting step that cooperates with the necking portion.

[0016] Furthermore, along the retraction direction of the liquid core, the liquid core includes a first core segment, a second core segment and a third core segment connected in sequence, and an elastic groove is provided on the third core segment, and the elastic groove extends from the free end of the third core segment toward the second core segment, so that the third core segment undergoes elastic deformation under the action of the elastic groove.

[0017] According to another aspect of the present invention, a syringe is provided, comprising a needle tube structure and a needle structure mounted on the needle tube structure, wherein the needle structure is the above-mentioned needle structure.

[0018] The needle assembly provided by the present invention is provided with a detachable mounting seat at the front end of the traditional needle tube housing, the mounting seat is provided with a first connecting part, the needle tube housing is provided with a second connecting part, the mounting seat is connected to the second connecting part on the needle shell through the first connecting part to fix the mounting seat on the needle shell, and the mounting seat is provided as a structure with a cavity inside to form a mounting cavity; a liquid core is passed through the mounting cavity of the mounting seat, and the liquid core is used to install the needle, and the liquid in the needle tube can be input into the needle through the liquid core to complete the injection; a liquid-proof part is provided between the inner wall of the mounting cavity of the mounting seat and the outer wall of the liquid core, and the liquid-proof part is fixedly installed on the inner wall of the mounting cavity and cooperates with the liquid core limit. The function of the liquid-proof part is to fix the liquid core on the mounting seat and prevent the liquid in the needle tube from penetrating into the mounting cavity of the mounting seat. In addition, when the liquid core is acted upon by an external force and moves toward the outside of the mounting cavity along the axial direction of the housing, the liquid core can be separated from the liquid-proof part to drive the needle to retract into the needle tube housing. In this way, the needle can be prevented from stabbing the staff, thereby solving the problem in the prior art that the needle of the syringe is exposed and easily stabbed the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic structural diagram showing an embodiment in which the needle structure of the present invention is installed on the housing of a syringe;

[0021] Figure 2 A schematic diagram showing the assembly of an embodiment of a needle structure of the present invention;

[0022] Figure 3 A schematic structural diagram of the housing of the syringe of the present invention is shown;

[0023] Figure 4 Shows Figure 3 A top view of the housing of the syringe in FIG.

[0024] Figure 5 A schematic structural diagram of a mounting base of a needle structure of the present invention is shown;

[0025] Figure 6 Shows Figure 5 A cross-sectional view of a mounting base of the needle structure shown;

[0026] Figure 7 A cross-sectional view of the liquid-permeable core of the needle structure of the present invention is shown;

[0027] Figure 8 A schematic structural diagram of the liquid-permeable core of the needle structure of the present invention is shown;

[0028] Fig. 9 A schematic diagram showing the structure of the syringe needle structure of the present invention being retracted into the syringe housing;

[0029] Fig.10 A schematic diagram showing the needle structure of the syringe of the present invention in an initial state; and

[0030] Fig.11 A structural diagram showing the sealing member of the syringe of the present invention.

[0031] The above drawings include the following reference numerals:

[0032] 1. Mounting seat; 11. Mounting cavity; 12. First connecting part; 13. First seat body; 14. Second seat body; 141. Narrowing part; 2. Shell; 21. Second connecting part; 22. Second locking part; 3. Liquid core; 31. Stop flange; 32. First locking part; 321. Locking groove; 33. Fluid channel; 34. Limiting step; 35. First core segment; 36. Second core segment; 37. Third core segment; 371. Elastic groove; 4. Liquid-proof part; 5. Hollow push rod; 51. Stop part; 6. Sealing part; 61. Step; 62. Protrusion; 63. Locking buckle; 65. Hemispherical structure; 7. Piston; 8. Spring; 9. Safety plug; 91. Hemispherical head; 92. Groove; 93. Double flange. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] The present invention provides a needle structure, referring to Figures 1 to 11 The needle structure includes: a mounting seat 1, on which a mounting cavity 11 and a first connecting portion 12 are provided, and the mounting seat 1 is detachably connected to a second connecting portion 21 of a housing 2 of a syringe through the first connecting portion 12; a liquid core 3, which is used to mount the needle, and the liquid core 3 is inserted into the mounting cavity 11; a liquid-proof member 4, which is arranged between the inner wall of the mounting cavity 11 and the outer wall of the liquid core 3, so as to seal the mounting seat 1 and the liquid core 3 through the liquid-proof member 4; wherein the liquid-proof member 4 is limitedly matched with the liquid core 3, so as to position the liquid core 3 on the mounting seat 1 through the liquid-proof member 4, and the liquid core 3 is separated from the liquid-proof member 4 and the mounting seat 1 under the action of an external force so as to retract the needle into the housing 2.

[0035] The needle assembly provided by the present invention is provided with a detachable mounting seat at the front end of the traditional needle tube housing, the mounting seat is provided with a first connecting part, the needle tube housing is provided with a second connecting part, the mounting seat is connected to the second connecting part on the needle shell through the first connecting part to fix the mounting seat on the needle shell, and the mounting seat is provided as a structure with a cavity inside to form a mounting cavity; a liquid core is passed through the mounting cavity of the mounting seat, and the liquid core is used to install the needle, and the liquid in the needle tube can be input into the needle through the liquid core to complete the injection; a liquid-proof part is provided between the inner wall of the mounting cavity of the mounting seat and the outer wall of the liquid core, and the liquid-proof part is fixedly installed on the inner wall of the mounting cavity and cooperates with the liquid core limit. The function of the liquid-proof part is to fix the liquid core on the mounting seat and prevent the liquid in the needle tube from penetrating into the mounting cavity of the mounting seat. In addition, when the liquid core is acted upon by an external force and moves toward the outside of the mounting cavity along the axial direction of the housing, the liquid core can be separated from the liquid-proof part to drive the needle to retract into the needle tube housing. In this way, the needle can be prevented from stabbing the staff, thereby solving the problem in the prior art that the needle of the syringe is exposed and easily stabbed the staff.

[0036] In this embodiment, a first connection method for connecting the first connection portion 12 and the second connection portion 21 is:

[0037] like Figure 1 As shown, the first connection portion 12 is threadedly connected to the second connection portion 21 .

[0038] Specifically, the second connection part 21 is an internal thread, and the first connection part 12 is an external thread matching the internal thread, so that the first connection part 12 is threadedly connected to the second connection part 21. This combined structure is simple, low-cost, and easy to process.

[0039] In this embodiment, the second connection method for connecting the first connection part 12 and the second connection part 21 is:

[0040] The first connection portion 12 and the second connection portion 21 are engaged with each other.

[0041] Specifically, the first connection portion 12 is provided with a bayonet portion, and the second connection portion 21 is a snap-fit ​​portion, which is snapped into the bayonet portion to achieve snap-fit ​​between the first connection portion 12 and the second connection portion 21 .

[0042] The above two connection modes, that is, the first connection part on the mounting seat and the second connection part on the mounting seat can be threadedly connected or mutually clamped, are convenient for installation and disassembly. When the needle is injected, the connection between the mounting seat and the shell can be ensured to be firm.

[0043] In this embodiment, the liquid-proof member 4 is annular, and is mounted on the mounting seat 1 and sleeved on the outer side of the liquid-passing core 3 .

[0044] In order to achieve the sealing and fixing effect between the mounting seat and the liquid-passing core, the liquid-proof component 4 is arranged in a ring shape, which can better fit the liquid-passing core. The liquid-proof component 4 is installed on the mounting seat 1 so that the liquid-proof component 4 is fixedly connected to the mounting seat 1, and the inner ring sleeve of the liquid-proof component 4 is arranged on the liquid-passing core. On the one hand, it can effectively play a role of liquid-proof sealing when the needle tube is injected. On the other hand, when the liquid-passing core moves into the outer shell under the action of external force, because one end of the liquid-proof component is fixed on the outer shell, it will not separate from the outer shell with the movement of the liquid-passing core, thereby more effectively ensuring the effect of the liquid-proof component driving the needle to retract into the outer shell.

[0045] like Figure 7 As shown, a stop flange 31 is provided on the outer wall of the liquid-through core 3, and the stop flange 31 cooperates with the liquid-proof part 4 to limit the liquid-through core 3 on the mounting seat 1; at least part of the liquid-proof part 4 is telescopically arranged, and when the liquid-through core 3 is subjected to external force to separate from the liquid-proof part 4, the stop flange 31 is compressed and passes through the liquid-proof part 4 to make the liquid-through core 3 retract toward the inside of the outer shell 2.

[0046] In the present application, a stop flange 31 is provided on the liquid-passing core 3, so that the contact area between the liquid-passing core 3 and the liquid-proof part 4 is increased, and the sealing effect of preventing liquid leakage can be better achieved; the liquid-proof part 4 and the stop flange 31 are limitedly cooperated, so as to ensure that when the liquid-passing core is not subjected to external force, the liquid-passing core 3 can be prevented from passing over the liquid-proof part 4, so as to fix the liquid-passing core 3 in the mounting cavity 11 of the mounting seat 1; the setting of the stop flange 31 should ensure that when the liquid-passing core 3 is separated from the liquid-proof part 4 by external force, the stop flange can pass over the liquid-proof part 4, thereby completing the effect of the liquid-passing core 3 driving the needle to retract into the interior of the outer shell 2.

[0047] In this embodiment, the liquid core 3 has a first locking portion 32 that is locked with the second locking portion 22 in the shell 2, so that the second locking portion 22 drives the liquid core 3 to retract toward the shell 2 through the locking cooperation between the first locking portion 32 and the second locking portion 22.

[0048] In order to achieve the retraction of the liquid core 3, as Figure 7 As shown, the liquid core 3 has a fluid channel 33 for fluid circulation, the first locking portion 32 is a locking groove 321 arranged in the fluid channel 33, and at least a portion of the second locking portion 22 is inserted into the locking groove 321 to lock with the locking groove 321.

[0049] In the present application, a first locking portion is provided on the liquid-passing core 3, and a second locking portion 22 which is locked and matched with the first locking portion 32 is provided on the outer shell 2; initially, the first locking portion and the second locking portion are in a separated state, and when an injection is performed, the second locking portion on the outer shell is locked and matched with the first locking portion on the liquid-passing core through the action of external force, and the first locking portion after the locked match can move with the second locking portion under the action of external force, so that the liquid-passing core can break free from the limiting effect of the liquid-proof part, thereby achieving the effect of the liquid-passing core driving the needle to retract into the outer shell.

[0050] In the present application, a fluid channel for fluid to pass through is set on the liquid core to ensure that the liquid core guides the liquid to be injected from the syringe into the needle. A locking groove is set in the fluid channel to lock with the second locking part of the shell. The structure is simple and the locking groove is set. While ensuring the fluid conduction, the liquid core can also drive the needle to retract into the shell.

[0051] In this embodiment, the second locking portion 22 is a ball head, and the inner wall surface of the locking groove 321 is at least a portion of a spherical surface that matches the ball head.

[0052] In the present application, the second locking part on the outer shell is set as a ball head, which can reduce the resistance encountered by the second locking part when entering the locking groove. The ball-head-shaped locking groove can increase the contact area between the first locking part and the second locking part, making the locking fit tighter. The inner wall surface of the locking groove is set to at least a part of the spherical surface that matches the head of the second locking part, so that when the second locking part enters the locking groove, the inner wall surface of the locking groove can fit at least a part of the second locking part, thereby completing the locking effect and allowing the liquid core to drive the needle to retract into the outer shell.

[0053] In this embodiment, there are multiple locking grooves 321 , and the multiple locking grooves 321 are sequentially arranged along the extension direction of the fluid channel 33 .

[0054] In the present application, a plurality of locking grooves are arranged at intervals along the fluid channel, and the length of the fluid channel is fully utilized. When a locking groove on the liquid-passing core fails to complete a locking fit with the second connecting portion on the outer shell, the second connecting portion can continue to move inward along the fluid channel until it completes a locking fit with another locking groove, thereby driving the liquid-passing core to detach from the liquid-proof part, and allowing the liquid-passing core to drive the needle to retract into the outer shell.

[0055] In this embodiment, the mounting seat 1 includes a first seat body portion 13 and a second seat body portion 14 connected to each other, the first connecting portion 12 is arranged on the outer side of the first seat body portion 13, a necking portion 141 is arranged on the second seat body portion 14, and a limiting step 34 is arranged on the liquid core 3 to cooperate with the necking portion 141.

[0056] In the present application, the mounting seat includes a first seat body portion and a second seat body portion that are interconnected, the first seat body portion is arranged on the outer side of the second seat body portion, the second seat body portion is provided with a necking portion, and the liquid passing core is provided with a limiting step that cooperates with the necking portion, and the necking portion limits the liquid passing core in the mounting cavity of the mounting seat through the limiting platform; under the joint action of the limiting cooperation between the necking portion and the limiting platform and the limiting cooperation between the stop flange and the liquid-proof part, the position of the liquid passing core is limited, so that the liquid passing core can be stably installed in the mounting cavity without the action of external force.

[0057] In this embodiment, along the retraction direction of the liquid core 3, the liquid core 3 includes a first core segment 35, a second core segment 36 and a third core segment 37 connected in sequence, and an elastic groove 371 is provided on the third core segment 37. The elastic groove 371 extends from the free end of the third core segment 37 toward the second core segment 36, so that the third core segment 37 is elastically deformed under the action of the elastic groove 371.

[0058] In the present application, along the retraction direction of the liquid core, the liquid core includes a first core segment, a second core segment and a third core segment connected in sequence, and an elastic groove is provided on the third core segment. When the second locking portion on the shell enters the locking groove, the elastic groove can expand the third core segment, so that the second locking portion is stuck in the elastic groove, and the elastic groove extends from the free end of the third core segment toward the second core segment, so that the third core segment is elastically deformed under the action of the elastic groove. After the deformation, the third core segment generates a rebound force, which reacts to the elastic groove, prompting the locking groove to shrink inward, so that the locking groove can lock the second locking portion.

[0059] The present invention provides a syringe, comprising a needle tube structure and a needle structure installed on the needle tube structure, and the needle structure is the above-mentioned needle structure.

[0060] The needle structure in this embodiment is described in detail below with reference to the accompanying drawings:

[0061] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the mounting seat 1 is connected to the housing 2 by threads, the first seat body 13 of the mounting seat 1 is connected to the outlet position of the housing 2, the second seat body 14 of the mounting seat 1 is installed in the first seat body 13, the first seat body 13 has a mounting cavity 11, the liquid core 3 is arranged in the mounting cavity 11, the outlet position of the first seat body 13 is provided with a constriction portion 141, and the liquid core 3 is provided with a limiting step 34 that cooperates with the constriction portion 141. A liquid-proof part 4 is fixed on the inner wall of the cavity 11, and the liquid-proof part 4 is annular. A stop flange 31 is provided on the outer wall of the liquid-passing core 3, and the stop flange 31 cooperates with the liquid-proof part 4 to limit the liquid-passing core 3 in the installation cavity 11; when the liquid-passing core 3 is separated from the liquid-proof part 4 by external force, the stop flange 31 passes over the liquid-proof part 4 to retract the liquid-passing core 3 toward the inside of the shell 2, and a needle is installed in the liquid-passing core 3 for outputting the liquid in the needle tube into the human body.

[0062] like Figure 1 , Figure 7 , Figure 8 As shown, a first ball-shaped locking portion 32 is provided on the liquid-passing core 3, and a first ball-shaped locking portion 32 is provided on the outer shell 2. In the initial state, the first locking portion 32 and the second locking portion 22 are in a separated state. When an injection is performed, the second locking portion 22 on the outer shell 2 moves toward and contacts the first locking portion 32 of the mounting seat 1 through the action of an external force, and is locked with the first locking portion 32. After the locking, the first locking portion can move toward the outer shell 2 under the action of the second locking portion 22 under the action of an external force, so that the liquid-passing core 3 can break free from the limiting effect of the liquid-proof component 4, thereby completing the liquid-passing core 3 driving the needle to retract into the outer shell 2.

[0063] like Figure 1 , Figure 8 , Fig. 9 , Fig.10As shown, along the retraction direction of the liquid core 3, the liquid core 3 includes a first core segment 35, a second core segment 36 and a third core segment 37 which are connected in sequence, and an elastic groove 371 is provided on the third core segment 37, and the elastic groove 371 extends from the free end of the third core segment 37 toward the second core segment 36; during injection, the second locking portion 22 is pressed into the fluid channel 33 of the liquid core 3 under the action of external force, and the ball-shaped second locking portion 22 is pressed into the locking groove 321, and the third core segment 37 expands due to the pressing of the second locking portion 22, and generates elastic deformation under the action of the elastic groove 371, The rebound force generated by the deformed third core segment reacts on the locking groove 321, so that the locking groove 321 and the second locking portion 22 fit tightly together to complete the locking; a plurality of locking grooves 321 are arranged in sequence along the extension direction of the fluid channel 33. When the second locking portion 22 is pressed into the outermost locking groove 321, the second locking portion can continue to move in the fluid channel 33 to cross the outer locking groove 321 and enter the inner locking groove 321. At this time, the third core segment will produce greater elastic deformation, bringing greater rebound force, so that the locking of the locking groove 321 and the second locking portion 22 is more firmly secured.

[0064] like Fig.10 As shown, when the medical staff completes the infusion, the locking groove 321 of the liquid-passing core 3 is locked with the second locking portion 22 of the shell 2, and the second locking portion 22 retracts into the shell 2 under the action of external force. The first locking portion 32 that is locked with the second locking portion 22 drives the liquid-passing core 3 to separate from the liquid-proof part 4 and retract into the shell 2 together. The needle is fixed on the liquid-passing core 3 and retracts into the shell 2 together with the liquid-passing core 3.

[0065] In addition, the present invention also protects a syringe with the needle assembly, such as Fig.10 Fig.11 As shown, the details are as follows:

[0066] The syringe includes a shell 2 and a hollow push rod 5. The hollow push rod 5 is installed in the inner hole of the shell 2. The syringe also includes: a sealing member 6, which is installed at the front end of the hollow push rod 5. A second locking portion 22 is provided at the front end of the sealing member 6. The rear end of the sealing member 6 is provided as a hemispherical structure 65; the liquid core 3 is installed in the mounting seat 1 to provide a channel for liquid to flow and be injected into human muscles when under pressure. The liquid core 3 is a key component of the syringe. The liquid core 3 is installed and locked in the center of the mounting seat 1, and a liquid-proof member 4 is installed at the position between the liquid core 3 and the mounting seat 1 to prevent leakage. The mounting seat 1 is locked to the upper end of the shell 2.

[0067] The sealing member 6 is installed at the center of the hollow push rod 5 and positioned under static pressure. A spring 8 is provided at the front end of the hollow push rod 5, which is in a static pressure state when not under pressure; a piston 7 is also installed at the front end of the hollow push rod 5, and the piston 7 cooperates with the shell 2, and the hollow push rod 5 is installed in the shell 2. When the hollow push rod 5 is pushed forward, the liquid in the shell 2 is pressurized to generate high pressure through the liquid core 3 and injected into the human body. When the spring 8 is pressurized, the liquid core 3 releases its elasticity, and together with the sealing member 6 and the liquid core 3, it retracts into the hollow push rod 5 and self-destructs, and locks the safety plug 9. It prevents the needle from being easily stabbed when used due to the exposed needle, leading to the spread of infectious sources such as hepatitis B, hepatitis C, and AIDS, thereby achieving the purpose of protecting the personal safety of nurses and preventing the harm to society caused by secondary infection.

[0068] The inner wall of the hollow push rod 5 is provided with a stopper 51, which is a blade-shaped structure, and provides that when the hollow push rod 5 is pushed forward, the spring 8 generates release elasticity, and the sealing member 6 is locked together with the liquid core 3 in the hollow push rod 5, so as to achieve the purpose of self-destruction. The setting of the hemispherical structure 65 can make the sealing member 6 enter the stopper 51 more smoothly, and the front end of the hollow push rod 5 is also provided with a concave groove, and the rear end of the hollow push rod 5 is provided with a safety plug 9, so as to provide a second locking when the self-destruction fails.

[0069] The central liquid hole of the liquid core 3 is provided with a fluid channel 33, which is a spiral channel, and the spiral channel includes a plurality of spiral segments, wherein the spiral angle of one spiral segment is 36 degrees, and the spiral angle of the spiral segment located in the middle is 22 degrees. The end of the fluid channel 33 close to the seal is a gourd-shaped structure, and the locking groove is a part of the gourd-shaped structure. When the liquid is injected under pressure, high pressure is generated when passing through the liquid core 3 and injected into the human body.

[0070] The mounting base 1 is threadedly connected to the housing 2 and will not separate from the housing 2 when high pressure is generated, but is tightly locked to the housing 2 .

[0071] The seal 6 is provided with a plurality of protrusions 62 and steps 61 to prevent the liquid from falling off when high pressure is generated, and is installed at the front end of the hollow push rod 5. A second locking portion is provided at the front end of the seal 6, and a hemispherical structure 65 is provided at the rear end of the seal 6. After the injection is completed, the seal 6 self-destructs when it retracts into the hollow push rod 5 and passes through the blade structure provided inside the housing 2. The seal 6 is also provided with a lock buckle 63 at the lower end. The lock buckle 63 of the seal 6 prevents the stopper 51 from failing to self-destruct, and can also be remedied and locked to the rear end of the hollow push rod 5.

[0072] A hemispherical head 91 is arranged at the top of the safety plug 9 , a groove 92 is arranged below the hemispherical head 91 , and a double flange 93 is arranged at the lower end of the groove 92 to be interference fit with the rear end of the hollow push rod 5 .

[0073] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0074] After the medical staff completes the injection, the needle assembly can retract the needle into the shell, so that the needle will not injure the medical staff, thereby avoiding the spread of diseases such as hepatitis B, hepatitis C, AIDS, etc. and causing infection to the medical staff.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A needle structure, characterized in that: include: A mounting seat (1), wherein a mounting cavity (11) and a first connecting portion (12) are provided on the mounting seat (1), and the mounting seat (1) is detachably connected to a second connecting portion (21) of a housing (2) of a syringe via the first connecting portion (12); A liquid-passing core (3), the liquid-passing core (3) being used for mounting a needle, the liquid-passing core (3) being arranged in the mounting cavity (11); a liquid-proof component (4), the liquid-proof component (4) being arranged between the inner wall of the mounting cavity (11) and the outer wall of the liquid-passing core (3), so as to seal between the mounting seat (1) and the liquid-passing core (3) through the liquid-proof component (4); The liquid-proof component (4) and the liquid-passing core (3) are limitedly matched to position the liquid-passing core (3) on the mounting seat (1) through the liquid-proof component (4), and the liquid-passing core (3) is separated from the liquid-proof component (4) and the mounting seat (1) under the action of an external force so that the needle is retracted into the housing (2); The liquid-permeable core (3) comprises a first locking portion (32) which is locked with a second locking portion (22) in the housing (2), so that the second locking portion (22) drives the liquid-permeable core (3) to retract toward the housing (2) through the locking cooperation between the first locking portion (32) and the second locking portion (22); The liquid-passing core (3) has a fluid channel (33) for fluid circulation, the first locking portion (32) is a locking groove (321) arranged in the fluid channel (33), and at least a portion of the second locking portion (22) is inserted into the locking groove (321) to be locked with the locking groove (321); The second locking portion (22) is a ball head, and the inner wall surface of the locking groove (321) is at least a portion of a spherical surface that matches the ball head; There are a plurality of locking grooves (321), and the plurality of locking grooves (321) are arranged in sequence along the extension direction of the fluid channel (33).

2. The needle structure according to claim 1, characterized in that: The first connection portion (12) is threadedly connected to the second connection portion (21); or The first connecting portion (12) and the second connecting portion (21) are mutually clamped.

3. The needle structure according to claim 1, characterized in that: The second connection portion (21) is an internal thread, and the first connection portion (12) is an external thread that matches the internal thread, so that the first connection portion (12) and the second connection portion (21) are threadedly connected.

4. The needle structure according to claim 1, characterized in that: The liquid-proof component (4) is annular and is mounted on the mounting seat (1) and sleeved on the outer side of the liquid-passing core (3).

5. The needle structure according to claim 1, characterized in that: A stop flange (31) is provided on the outer wall of the liquid-passing core (3), and the stop flange (31) cooperates with the liquid-proof part (4) to limit the position of the liquid-passing core (3) on the mounting seat (1); at least part of the liquid-proof part (4) is arranged to be retractable, and when the liquid-passing core (3) is subjected to an external force to separate from the liquid-proof part (4), the stop flange (31) is compressed and passes through the liquid-proof part (4) to retract the liquid-passing core (3) toward the interior of the housing (2).

6. The needle structure according to claim 1, characterized in that: The mounting seat (1) comprises a first seat body portion (13) and a second seat body portion (14) which are connected to each other, the first connecting portion (12) is arranged on the outer side of the first seat body portion (13), the second seat body portion (14) is provided with a necking portion (141), and the liquid-passing core (3) is provided with a limiting step (34) which cooperates with the necking portion (141) to limit the position.

7. The needle structure according to claim 1, characterized in that: Along the retraction direction of the liquid-through core (3), the liquid-through core (3) comprises a first core segment (35), a second core segment (36) and a third core segment (37) which are connected in sequence, and an elastic groove (371) is provided on the third core segment (37), and 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 under the action of the elastic groove (371).

8. A syringe, characterized in that: It comprises a needle tube structure and a needle structure installed on the needle tube structure, and the needle structure is the needle structure according to any one of claims 1 to 7.

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