CN214050041U

CN214050041U - Novel retraction connecting structure puncture-proof syringe

Info

Publication number: CN214050041U
Application number: CN202021953144.6U
Authority: CN
Inventors: 郭春; 朱小鹏
Original assignee: Zhejiang Kangkang Medical Devices Co Ltd
Current assignee: Zhejiang Kangkang Medical Devices Co Ltd
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2021-08-27
Anticipated expiration: 2030-09-09

Abstract

The utility model discloses a puncture-proof injector with a novel retraction connecting structure, which comprises a needle cylinder, a push rod and an injection needle, wherein the end part of the push rod is connected with a piston, a retraction hole is arranged in the push rod, and a retraction rod is connected in the retraction hole; the end part of the retraction rod, which is positioned at the push rod, is provided with an annular positioning boss and is sleeved with a spring, and the end part of the annular positioning boss is provided with a positioning abutting inclined plane; the inner circumference of the retraction hole is uniformly provided with a push rod positioning clamp hole, an elastic inner convex clamping jaw is arranged in the positioning clamp hole, the elastic inner convex clamping jaw can overcome the elasticity of the spring and is positioned and abutted against the inclined plane on the annular positioning boss to form positioning and abutting, and therefore the retraction rod and the spring are positioned and installed in the retraction hole. The utility model overcomes the contradiction problem of the positioning mode in the prior art, and improves the reliability of connection; the assembling operation is convenient, the stability of the rebound stab-resistant function of the injector before and after use is improved, and the use safety is effectively improved.

Description

Novel retraction connecting structure puncture-proof syringe

Technical Field

The utility model relates to the technical field of syringes, concretely relates to novel retraction connection structure prevents stinging syringe.

Background

The syringe is a common medical appliance, and a needle on the syringe is used for injecting a heavy pressure part in the medicine dispensing process; before injection, dispensing and using, the injection needle of the injector is generally provided with a protective cap for protection, and when the injection needle is not used, the needle body is positioned in the protective cap and cannot cause puncture injury to medical staff; after the injection needle is used, the medical staff usually cannot sleeve the protective cap on the needle again due to large workload and working strength of the medical staff, so that the exposed sharp needle is easy to stab the medical staff, and the exposed needle cannot stab the staff in the centralized placing and recycling process; the liquid medicine and germs used for injection are mostly remained on the used injection needle and the needle head, and the risk of germ infection is easily caused by puncture wound under any condition.

Therefore, the retractable syringe in the market can retract the needle body of the injection needle into the retractable syringe, and most of the retraction structures in the existing market adopt the structure matching of a spring and a sliding rod to pull the needle body of the injection needle back into the syringe; in the existing structure, a convex rib is mainly adopted to position the end part of a sliding rod before injection, so that a spring on the sliding rod is kept compressed, the structure of the convex rib is stiff and has poor elasticity, and the following binary contradictory conditions are satisfied at the position, namely the spring can resist the counterforce of the spring, the force of the spring cannot be small, otherwise a needle head cannot be effectively pulled back, the force of the spring is large, the rib must be inwards convex enough, otherwise the counterforce of the spring cannot be resisted; the size of the inward convex rib is influenced by the forced demolding of the mold, and the size of the convex rib is also influenced by the assembly, so that the size adjustment is limited; therefore, the existing structure causes the phenomenon that the installation and the positioning of the spring and the sliding rod are not stable enough, the installation requirement is high, the retraction can not be realized frequently, and the use is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems in the prior art and providing a novel anti-stab syringe with a retraction connecting structure.

In order to achieve the above purpose, the technical scheme of the utility model is that: a puncture-proof injector with a novel retraction connecting structure comprises a needle cylinder, a push rod and an injection needle, wherein the end part of the push rod is connected with a piston, a retraction hole is formed in the push rod, and a retraction rod is connected in the retraction hole; the end part of the retraction rod, which is positioned at the push rod, is provided with an annular positioning boss and is sleeved with a spring, and the end part of the annular positioning boss is provided with a positioning abutting inclined plane; the circumference evenly is provided with push rod location card hole in the hole that contracts, be provided with elasticity protruding jack catch in the push rod location card hole, spring one end and push rod inboard support to, the other end supports with annular location boss and supports and lean on, elasticity protruding jack catch in can overcoming spring force, with annular location boss go up the location support to lean on the inclined plane formation location and support to make the retraction rod and spring location install in the retraction hole.

The injection needle comprises an outer needle seat, an inner needle seat, a positioning switch and a needle body, wherein the needle body is connected with the inner needle seat, the inner needle seat is arranged in the outer needle seat and is positioned through the positioning switch, the inner needle seat is respectively provided with a positioning step and an unlocking step, and the circumference of the end part of the positioning switch is uniformly provided with a plurality of elastic positioning claws; the end part of the retraction rod is provided with a hanging buckle hole, a hanging buckle boss is arranged in the hanging buckle hole, and the retraction rod can release the positioning of the positioning switch on the inner needle base and can form a buckle with the inner needle base to carry out synchronous motion.

The inner side of the elastic inner convex clamping jaw is provided with an installation inclined sliding surface.

The retraction hole comprises a positioning part and a rebound part, and an installation positioning step is formed between the positioning part and the rebound part.

The retractable hole of the push rod is connected with a dismounting cover, one side of the dismounting cover, which is positioned in the retractable hole, is provided with a retractable clamping rod, and the end part of the retractable rod is provided with a retractable clamping hole which corresponds to the retractable clamping rod and can realize clamping with the retractable clamping rod.

The retraction clamping rod is provided with a deformation through groove, and a buckle bulge is arranged in the retraction clamping hole.

A thinning cavity is arranged in the piston.

Adopt above technical scheme, the utility model discloses following beneficial effect has:

compared with the prior art, the utility model discloses after the injection is used, continue the application of force and promote the push rod, can make the pole that contracts of returning of push rod tip stretch into in the positioning switch, remove the positioning action of the internal needle file of positioning switch, and simultaneously and interior needle file between form the buckle and be connected, when returning the pole tip top and leaning on including the needle file, the application of force reaction of push rod this moment is on the retraction rod, it supports the protruding jack catch to press the outside to take place deformation in with elasticity to return pole atress tip annular location boss, make it remove the positioning action to returning the pole that contracts, thereby make spring force obtain the release, with the retraction rod, interior needle file and needle body kick-back move to the push rod in.

The design and use of the elastic inner convex jack catch of the utility model overcome the contradiction problem existing in the positioning mode in the prior art, and improve the reliability of connection and use; and when the assembly, the elastic inner convex clamping jaw is pressed to the outer side to deform through the annular positioning boss on the retraction rod, so that the end part of the elastic inner convex clamping jaw is pressed to position, and the assembly operation is convenient.

Drawings

FIG. 1 is a cross-sectional view of the present invention (with the positioning switch unlocked by the retraction lever after injection);

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

fig. 4 is an exploded perspective view of the present invention;

fig. 5 is a sectional view of the present invention (in the state of entering the puncture-proof state after use).

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1 to 5, the utility model provides a novel puncture-proof injector with a retraction connection structure, which comprises a needle cylinder 1, a push rod 2 and an injection needle, wherein the end part of the push rod 2 is connected with a piston 3, a retraction hole 4 is arranged in the push rod 2, a retraction rod 5 is connected in the retraction hole 4, the end part of the retraction rod 5, which is positioned at the push rod 2, is provided with an annular positioning boss 6 and is sleeved with a spring 7, and the end part of the annular positioning boss 6 is provided with a positioning abutting inclined plane 8; the circumference evenly is provided with push rod location card hole 9 in the hole 4 that contracts, be provided with elasticity protruding jack catch 10 in the push rod location card hole 9, protruding jack catch 10 in elasticity and push rod 2 structure as an organic whole, when assembling, spring 7 cover is on the retraction pole 5, push in from the retraction hole 4 of push rod 2, until retraction pole 5 tip annular location boss 6 with elasticity protruding jack catch 10 support press in push rod location card hole 9 to the outside take place deformation, and support through the location and lean on inclined plane 8 and elasticity protruding jack catch 10 formation location and support, thereby make retraction pole 5 location install in retraction hole 4, spring 7 is in by the compression state this moment, spring 7 one end supports with push rod 2 inboard and supports, the other end supports with annular location boss 6 and leans on.

The injection needle comprises an outer needle base 11, an inner needle base 12, a positioning switch 13 and a needle body 14, wherein the needle body 14 is connected with the inner needle base 12, the inner needle base 12 is arranged in the outer needle base 11, a fixing boss 15 which is used for forming positioning clamping fixation on the positioning switch 13 is arranged in the outer needle base 11, so that the positioning switch 13 is positioned, a positioning step 16 and an unlocking step 17 are respectively arranged on the inner needle base 12, a plurality of elastic positioning claws 18 are uniformly arranged on the circumference of the end part of the positioning switch 13, and the inner needle base 12 is abutted against the positioning step 16 by the elastic positioning claws 18 to form positioning installation; the end part of the retraction rod 5 is provided with a hanging and buckling hole 19, and a hanging and buckling boss 20 is arranged in the hanging and buckling hole 19.

After the injection is finished, the force is continuously applied to the push rod 2, the piston 3 at the end part of the push rod is compressed under the action of pressure, the piston 3 is compressed, so that the push rod 2 drives the retraction rod 5 at the end part to continuously move, the end part of the retraction rod 5 props open the elastic positioning claw 18 on the positioning switch 13, the positioning of the positioning switch 13 on the inner needle base 12 is released, and the buckling boss 20 and the unlocking step 17 on the inner needle base 12 form a buckle, so that the two can synchronously move; on the force application reaction retraction rod 5 after the positioning of the inner needle base 12 is released, the retraction rod 5 is stressed, the annular positioning boss 6 at the end part of the retraction rod supports and presses the elastic inner convex clamping jaws 10, so that the elastic inner convex clamping jaws 10 deform outwards in the push rod positioning clamping holes 9, the elastic inner convex clamping jaws 10 release the positioning effect on the retraction rod 5, further the elastic force of the spring 7 is released, when the elastic inner convex clamping jaws 10 return to the normal state, the spring 7 can still penetrate through the elastic inner convex clamping jaws to release the elastic force, the elastic force of the spring 7 releases the retraction rod 5, the inner needle base 12 and the needle body 14 to rebound and move to the retraction hole 4 of the push rod 2, and the needle body is effectively prevented from stabbing on a human body after injection use.

Furthermore, the inner side of the elastic inner convex claw 10 is provided with an installation inclined sliding surface 21, so that when the elastic inner convex claw 10 is assembled, the annular positioning boss 6 at the end part of the retraction rod 5 presses the elastic inner convex claw 10 outwards to enable the elastic inner convex claw 10 to deform elastically, and the annular positioning boss 6 can conveniently scratch the elastic inner convex claw 10 and enable the elastic inner convex claw 10 to be positioned and abutted to the inclined surface to form positioning and abutting with the elastic inner convex claw 10.

Further, the retraction hole 4 comprises a positioning portion 22 and a resilient portion 23, an installation positioning step 24 is formed between the positioning portion 22 and the resilient portion 23, and the installation positioning step 24 can have a positioning effect on a moving distance of the retraction rod 5 pushed into the retraction hole 4 when the retraction rod 5 and the spring 7 are assembled, so that the assembly connection is facilitated.

Furthermore, a dismounting cover 25 is connected to the retraction hole 4 of the push rod 2, a retraction clamping rod 26 is arranged on one side of the dismounting cover 25 in the retraction hole 4, and a retraction clamping hole 27 which corresponds to the retraction clamping rod 26 and can be buckled with the retraction clamping rod is arranged at the end part of the retraction rod 5; the dismounting cover 25 can play a role in resisting and preventing slipping out after the retraction rod 5 retracts to finish the anti-stabbing state; meanwhile, a deformation through groove 28 is formed in the retraction clamping rod 26, a buckling protrusion 29 is arranged in the retraction clamping hole 27, and the elastic force of the spring 7 enables the retraction clamping rod 26 and the retraction rod 5 to play a role in retraction buffering and positioning through the matching of the deformation through groove 28 and the buckling protrusion 29.

Further, a thinning cavity 30 is arranged in the piston 3, so that the piston 3 is more labor-saving to be thinned, and the retraction rod 5 at the end part of the push rod 2 is easier to release the positioning effect of the positioning switch 13 on the inner needle base 12.

The puncture-proof injector of the novel retraction connection structure provided by the embodiment of the utility model is described in detail, the principle and the implementation mode of the utility model are explained by applying specific examples, and the description of the above embodiments is only used for helping to understand the technical scheme disclosed by the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A puncture-proof injector with a novel retraction connecting structure comprises a needle cylinder, a push rod and an injection needle, wherein the end part of the push rod is connected with a piston, a retraction hole is formed in the push rod, and a retraction rod is connected in the retraction hole; the method is characterized in that: the end part of the retraction rod, which is positioned at the push rod, is provided with an annular positioning boss and is sleeved with a spring, and the end part of the annular positioning boss is provided with a positioning abutting inclined plane; the circumference evenly is provided with push rod location card hole in the hole that contracts, be provided with elasticity protruding jack catch in the push rod location card hole, spring one end and push rod inboard support to, the other end supports with annular location boss and supports and lean on, elasticity protruding jack catch in can overcoming spring force, with annular location boss go up the location support to lean on the inclined plane formation location and support to make the retraction rod and spring location install in the retraction hole.

2. The novel anti-puncture syringe with the retraction connection structure as claimed in claim 1, wherein: the injection needle comprises an outer needle seat, an inner needle seat, a positioning switch and a needle body, wherein the needle body is connected with the inner needle seat, the inner needle seat is arranged in the outer needle seat and is positioned through the positioning switch, the inner needle seat is respectively provided with a positioning step and an unlocking step, and the circumference of the end part of the positioning switch is uniformly provided with a plurality of elastic positioning claws; the end part of the retraction rod is provided with a hanging buckle hole, a hanging buckle boss is arranged in the hanging buckle hole, and the retraction rod can release the positioning of the positioning switch on the inner needle base and can form a buckle with the inner needle base to carry out synchronous motion.

3. The novel anti-puncture syringe with the retraction connection structure as claimed in claim 1, wherein: the inner side of the elastic inner convex clamping jaw is provided with an installation inclined sliding surface.

4. The novel anti-puncture syringe with the retraction connection structure as claimed in claim 1, wherein: the retraction hole comprises a positioning part and a rebound part, and an installation positioning step is formed between the positioning part and the rebound part.

5. The novel anti-puncture syringe with the retraction connection structure as claimed in claim 1, wherein: the retractable hole of the push rod is connected with a dismounting cover, one side of the dismounting cover, which is positioned in the retractable hole, is provided with a retractable clamping rod, and the end part of the retractable rod is provided with a retractable clamping hole which corresponds to the retractable clamping rod and can realize clamping with the retractable clamping rod.

6. The novel anti-puncture syringe with the retraction connection structure as claimed in claim 5, wherein: the retraction clamping rod is provided with a deformation through groove, and a buckle bulge is arranged in the retraction clamping hole.

7. The novel anti-puncture syringe with the retraction connection structure as claimed in claim 1, wherein: a thinning cavity is arranged in the piston.