CN109701125A

CN109701125A - One kind is pulled back self-locking injector

Info

Publication number: CN109701125A
Application number: CN201811629594.7A
Authority: CN
Inventors: 梁栋科; 吴德华; 徐梓填; 叶子皓
Original assignee: Zhuhai Federer Medical Devices Co
Current assignee: Zhuhai Federer Medical Devices Co
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2019-05-03
Anticipated expiration: 2038-12-28
Also published as: CN109701125B

Abstract

The present invention relates to the field of medical instrument technology, in particular to one kind is pulled back self-locking injector, it include cylinder, it is removably set on the intracorporal core bar of cylinder, self-locking structure is provided in cylinder, the first frustum matched with self-locking structure is provided on core bar, piston is arranged on core bar, elastic component is provided in piston, core bar advance the puck makes the first frustum cross self-locking structure, elastic component compression, which is contractd, drives core bar to be pulled back, the rear end face of first frustum abuts self-locking structure, self-locking injector of pulling back of the invention includes the self-locking structure being arranged on cylinder and the first frustum for being arranged on core bar and matching with self-locking structure, during core bar pushes forward, while first frustum crosses self-locking structure, first boss crimps the elastic component on piston, elastic component generates the effect of pulling back to core bar always, so that the first frustum Rear end face abuts self-locking structure always, and realization is self-locking, prevents syringe reuse.

Description

One kind is pulled back self-locking injector

Technical field

The present invention relates to the field of medical instrument technology, in particular to one kind is pulled back self-locking injector.

Background technique

Safety injector is the Disposable Aseptic Medical Instruments for carrying out drug injection to patient, it is avoided that handing over Fork infection, easy to use, the deep approval by vast hospitalized patients；Safety injector is many kinds of at present, but its parts design Many and diverse, assembling is not easy, and causes cost very high；And the withdraw of the needle resistance of most of safety injector is inadequate, and needle point is easy to retract In housing, medical fluid is caused to leak out, polluted.

Summary of the invention

The present invention in order to solve the above problem used by technical solution be to provide one kind and pull back self-locking injector, include Cylinder is removably set on the intracorporal core bar of cylinder, and self-locking structure is provided in the cylinder, is provided on core bar and self-locking structure The first frustum matched is arranged with piston on core bar, elastic component is provided in piston, core bar advance the puck makes the first frustum Self-locking structure is crossed, elastic component compression, which is contractd, drives core bar to be pulled back, and the rear end face of the first frustum abuts self-locking structure, the core bar On be provided with first boss, be provided with the inner cavity that can accommodate first boss on piston, elastic component is arranged on inner cavity, core bar court Preceding movement, first boss crimp elastic component.

As a further improvement of the foregoing solution, it is provided on the piston and holds the through-hole that core bar passes through, core bar is equipped with Abut the third frustum of through-hole.

As a further improvement of the foregoing solution, the piston is made of plastic material, and piston seal is socketed in cylinder It is interior and can be moved in cylinder with core bar.

As a further improvement of the foregoing solution, the self-locking structure includes to be fixed at the intracorporal connector of cylinder, The front end of connector is provided with several elastic claws drawn close towards core bar axis direction, and the first frustum advance the puck can be crimped and be got over Elastic claw is crossed, is moved backwards, elastic claw is abutted.

As a further improvement of the foregoing solution, the elastic claw is one of the forming with connector.

As a further improvement of the foregoing solution, the rear end of first frustum is provided with the second frustum.

As a further improvement of the foregoing solution, the hook ring for snapping piston nose, piston are provided on the core bar Region between hook ring and first boss is set on core bar, and elastic component is compressed always.

Compared with prior art, the beneficial effects of the present invention are: firstly, self-locking injector of pulling back of the invention includes The self-locking structure being arranged on cylinder and the first frustum for being arranged on core bar and matching with self-locking structure, core bar is past to be pushed forward During sending, while the first frustum crosses self-locking structure, first boss crimps the elastic component on piston, and elastic component is right always Core bar generates the effect of pulling back, so that the rear end face of the first frustum abuts self-locking structure always, realization is self-locking, prevents syringe from returning With；Secondly, piston can move in cylinder with core bar, the front end of cylinder is abutted in piston, core bar being capable of opposing pistons continuation court Preceding movement, while so that the first frustum crosses self-locking structure, first boss crimps elastic component, and can prevent medical fluid from flowing into Leakage problem is caused in the inner cavity of piston.

Detailed description of the invention

To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described.Obviously, described attached drawing is a part of the embodiments of the present invention, rather than is all implemented Example, without creative efforts, other that can also be obtained according to these attached drawings are set those skilled in the art Meter scheme and attached drawing:

Fig. 1 is the diagrammatic cross-section before self-locking injector of pulling back of the invention is self-locking；

Fig. 2 is the diagrammatic cross-section after self-locking injector of pulling back of the invention is self-locking；

Fig. 3 is the structural side view of piston of the invention.

Specific embodiment

It is carried out below with reference to technical effect of the embodiment and attached drawing to design of the invention, specific structure and generation clear Chu is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair Bright a part of the embodiment, rather than whole embodiments, based on the embodiment of the present invention, those skilled in the art are not being paid Other embodiments obtained, belong to the scope of protection of the invention under the premise of creative work.

One kind as shown in Figures 1 and 2 is pulled back self-locking injector comprising is had cylinder 1, is removably set on cylinder 1 Interior core bar 2 is arranged with piston 3 on the core bar 2, and piston 3 is made of plastic material, and the sealing of piston 3 is socketed in cylinder 1 simultaneously It can be moved in cylinder 1 with core bar 2, be provided with self-locking structure in the cylinder 1, which includes connector 4, connection The front end of body 4 is provided with several elastic claws 41 drawn close towards axis direction, and specifically, the elastic claw 41 is along core bar 2 towards Forward Dynamic direction is gradually drawn close to axle center, and the elastic claw 41 and piston 3 can be integrally formed setting, is provided with and is somebody's turn to do on core bar 2 The first frustum 21 that self-locking structure matches, core bar 2 is mobile forward, and the first frustum 21 moves closer to and distending elastic claw 41, After first frustum 21 fully passes over elastic claw 41, elastic claw 41 can shrink recovery, when core bar 2 is pulled back, after the first frustum 21 End face abuts self-locking structure, and the first frustum 21 continues to crimp elastic claw 41, then elastic claw 41 can be made to draw close towards axis direction, from And realize self-locking function.

As a further improvement of the foregoing solution, as shown in Figures 1 and 2, the rear end of first frustum 21 is provided with Two frustums 23, its object is to avoid elastic claw 41 from generating leakage when return restores, the second frustum 23 can crimp bullet in time Property pawl 41, guarantee elastic claw 41 at medical fluid runner close in time.

Piston 3 as shown in Figure 2 and Figure 3, is provided with inner cavity 32, and elastic component 31 is arranged on inner cavity 32, sets on core bar 2 It is equipped with first boss 22, first boss 22 is accommodated in inner cavity 32, and the through-hole that core bar 2 passes through can be held by being additionally provided on piston 3 33, the front end that through-hole 33 is passed through on core bar 2 is provided with hook ring 25, and rear end is provided with the third frustum 24 for abutting through-hole 33, hook ring The distance between 25 and third frustum 24 are less than the hole depth of through-hole 33, it is intended that the first boss 22 on core bar 2 can begin Final pressure connects elastic component 31, i.e. elastic component 31 generates the effect of pulling back to core bar 2 always, so that the hook ring 25 on core bar 2 abuts always The front end of piston 3 prevents leakage to guarantee its leakproofness, it should be noted that be provided in cylinder 1 can stop piston 3 after The continuous stopper moved forward, after piston 3 is static with respect to cylinder 1, core bar 2 can continue to advance the puck, and third frustum 24 is pressed at this time It connects hole 33 and some is able to enter in through-hole 33, guarantee that medical fluid can not drain in the inner cavity 32 of piston 3；First frustum After 21 cross elastic claw 41, passes through first boss 22 because of the self-characteristic of elastic component 31 and the effect of pulling back is generated to core bar 2, so that The rear end face of first frustum 21 crimps elastic claw 41 always, and elastic claw 41 draws close realization self-locking function, while hook ring 25 towards axle center It crimps the front end of piston 3 and guarantees the leakproofness of medicine liquid channel, prevent leakage.

More than, only presently preferred embodiments of the present invention, the invention is not limited to above embodiment, as long as its with Identical means reach technical effect of the invention, all should belong to protection scope of the present invention.

Claims

The self-locking injector 1. one kind is pulled back, which is characterized in that include cylinder (1), the core that is removably set in cylinder (1) Bar (2), the cylinder (1) is interior to be provided with self-locking structure, and the first frustum matched with self-locking structure is provided on core bar (2) (21), it is arranged with piston (3), is provided with elastic component (31) in piston (3), core bar (2) advance the puck makes first on core bar (2) Frustum (21) crosses self-locking structure, and elastic component (31) compression, which is contractd, drives core bar (2) to be pulled back, and the rear end face of the first frustum (21) supports It is connected to lock construction, is provided with first boss (22) on the core bar (2), first boss can be accommodated by being provided on piston (3) (22) inner cavity (32), elastic component (31) are arranged on inner cavity (32), and core bar (2) advance the puck, first boss (22) crimps bullet Property part (31).
The self-locking injector 2. one kind according to claim 1 is pulled back, which is characterized in that be provided on the piston (3) Hold the through-hole (33) that core bar (2) pass through, core bar (2) is equipped with the third frustum (24) for abutting through-hole (33).
The self-locking injector 3. one kind according to claim 1 is pulled back, which is characterized in that the piston (3) uses plasticity Material is made, and piston (3) sealing is socketed in cylinder (1) and can move in cylinder (1) with core bar (2).
The self-locking injector 4. one kind according to claim 1 is pulled back, which is characterized in that the self-locking structure includes solid The fixed connector (4) being arranged in cylinder (1), the front end of connector (4) be provided with drawn close towards core bar (2) axis direction it is several A elastic claw (41), the first frustum (21) advance the puck can be crimped and be crossed elastic claw (41), move backwards, abut elastic claw (41)。
The self-locking injector 5. one kind according to claim 4 is pulled back, which is characterized in that the elastic claw (41) with connect Body (4) is one of the forming.
The self-locking injector 6. one kind according to claim 4 or 5 is pulled back, which is characterized in that first frustum (21) Rear end be provided with the second frustum (23).
The self-locking injector 7. one kind according to claim 2 is pulled back, which is characterized in that be provided on the core bar (2) For the hook ring (25) of snapping piston (3) front end, piston (3) be set on core bar (2) hook ring (25) and first boss (22) it Between region, elastic component (31) is compressed always.