CN207412474U - Easy to assembly exempts from O-ring safety self-destructing syringe - Google Patents

Abstract

Easy to assembly exempt from O-ring safety self-destructing syringe the utility model discloses a kind of, including housing, core bar, piston, syringe needle holder assembly, needle tubing, protective case, screens ring, needle tubing is fixed in syringe needle holder assembly, protection shroud is flexibly connected above needle tubing with outer taper formation, syringe needle holder assembly is fixed in the inner cavity of housing front end, piston is mounted on core bar, the main part of core bar is sleeved in housing, the front end of core bar in insertion needle holder assembly and can drive the needle tubing of syringe needle holder assembly and gluing in syringe needle holder assembly to retract together in housing in injection.The utility model is unlikely to deform aging, and the storage effect phase is long, ease of assembly operation, convenient for quality control, and effectively prevents the reuse of syringe and avoids the risk of accidental needle sticks harm.

Description

Easy to assembly exempts from O-ring safety self-destructing syringe

Technical field

The present invention relates to a kind of medical instrument, especially a kind of disposable syringe, specifically a kind of assembling Easily exempt from O-ring safety self-destructing syringe.

Background technology

Disposable sterilized injector is a kind of new type medical equipment that China introduces the 1980s.It is avoided that intersect Infection, it is easy to use, it is deep to be welcome by vast hospitalized patients.But prevent again since the disposable syringe of the quasi-tradition does not have The characteristic used, in addition some medical institutions mismanagement or interests driving, disposable syringe exist be recovered, peddle with again It is multiple to use.The reuse of syringe is propagated the diseases such as hepatitis B, AIDS.

Further, since the occupational exposure of medical staff, the dangerous use of disposable syringe causes to infect and propagate disease While sick, damage is also resulted in medical staff to varying degrees.According to relevant statistics, in the world it is annual about 1000000 medical workers are subject to sharps injury, wherein 84.6% is nurse, some infect hepatitis and Chinese mugwort due to unexpected injury It grows the haematogenous such as disease and infects disease.And in China, it is shown according to the Questionnaire results of 13 hospitals in Beijing, 432 practice shields Pricking wound occurred altogether in 10 months for scholar 1111 times, and average no one occurs 2.6 times for 10 months.

In order to improve cross infection of disease and medical staff's occupational exposure problem, the use of safety self-destructing syringe just becomes It is particularly important.At present, people have now been developed some safety self-destructing syringes to remedy the problem of such, but these safety Self-destruction syringe there are still it is complicated, equipped with O-ring seals made of silicone elastomer body material it is degradable cause storage imitate Phase is short, assembly force spends strong, assembling difficulty height causes inadaptable automatic assembling and batch production, makes transportational process without aseismatic design Vibrations cause the defects of some matable assemblies separation or self-destruction in advance etc..

201110320499.0 patents of invention of ZL of applicant are predominantly injected heavy dose of liquid and are designed, this practicality is new Type is to provide a kind of safety self-destructing syringe of the low dose of injecting liquid drug suitable for low-residual.

The content of the invention

For existing safety self-destructing syringe there are the defects of, it is new easy to assembly that the utility model provides one Exempt from the safety self-destructing syringe of O-ring.

The technical solution that the utility model is taken is as follows：

It is a kind of it is easy to assembly exempt from O-ring safety self-destructing syringe, including housing, core bar, piston, syringe needle holder assembly, Needle tubing, protective case, screens ring, needle tubing are fixed in syringe needle holder assembly, and protection shroud is mounted in needle tubing top and outer taper Flexible connection is formed, syringe needle holder assembly is fixed in the inner cavity of housing front end, and piston is mounted on core bar, the main body of core bar Part is sleeved in housing, the front end of core bar in injection in insertion needle holder assembly and can drive syringe needle holder assembly and gluing in Needle tubing in syringe needle holder assembly is retracted in housing together, and the syringe needle holder assembly is made of needle holder and ring wedge, and ring wedge is inserted In the inner cavity of needle holder and pass through two ring ladders thereon and strut the spring leaf of needle holder lower part so as to by pin Header elements are located in the front end inner cavity of housing；Hollow structure in the needle holder, its underpart are equipped with no less than 3 elastic leaves Piece is equipped with the annular outer weir of at least one outwardly convex, for ensuring pin in the increased periphery of needle holder mid diameter Headstock is not leaked with housing inner cavity wall surface fitted seal, is respectively equipped in the increased cylindrical cavity of needle holder mid diameter larger Annular inner convex platform I and annular in inner convex platform II；The ring wedge is interior hollow structure, and ring wedge top is interior hollow circuit cylinder, Outside wall surface around interior hollow circuit cylinder head is equipped with the annular outer platform of outwardly convex, and around interior hollow circuit cylinder head end mouth Even circumferential is distributed at least two inwardly elastic latch protruding upward, and ring wedge lower outside is equipped in outwards downward two A ring ladder.

The piston seal is set on core bar, barb is equipped with through the head of the core bar of piston, below piston Core bar is equipped with an annular groove, is set in annular groove there are two fan-shaped retaining card, and fan-shaped retaining card surrounds what diameter in annular groove reduced Core bar is symmetrical arranged, and two symmetrical sector notch are formed between two fan-shaped retaining cards, and sector notch is 100 ± 5 degree.It is fan-shaped The radius of retaining card is more than the radius of the circumference formed at screens ring inner convex platform；It is equipped on the lower section of annular groove and easily breaks Band.A longitudinally reinforced line muscle is respectively equipped between the top surface of the upper wall surface of annular groove and two fan-shaped retaining cards is formed, is used for The reverse drawing drag of the fan-shaped retaining card of enhancing.

The piston lower end is equipped with ring-shaped step for one week around outside wall surface, and step height is not less than 1.5mm, the rank of step Face is plane without chamfering.

The circle that the top surface that the piston is mounted on core bar annular groove is formed lifts, and circle lifts diameter and is slightly less than work Fill in the diameter of bottom surface outer diameter, simultaneously greater than piston bottom surface inner cavity.

The screens ring activity is assemblied in the screens annular groove of housing rear end portion.

The utility model has following advantageous effect compared with prior art：

1st, O-ring seals are set as individual part in the prior art, and assembling is complicated, and O-ring seals in the prior art Using elastomeric materials such as silica gel, since elastomeric material is yielding easy to aging, particularly tiny O-ring seals are tied due to it Structure feature makes it easier to deform, i.e., so that the product storage effect phase is short, can generate the risk of injection leakage.

The utility model, sealing ring is integrated by the medical high score material of good toughness with needle holder injection, on the one hand high Molecular material is unlikely to deform aging, and the storage effect phase is long, on the other hand reduces parts, ease of assembly operation, convenient for quality Control is especially suitable for using the automatic assembly operation of automation equipment during batch production.

2nd, in the prior art, there is also defects for the design of safety self-destructing syringe latch portion：Or 1) core bar with it is outer Set is buckled by outer lug boss in the annular that mutually sets, and when assembling is impacted core bar by force into housing inner cavity by frock, is retracted Pull resistance very big during to reach clamping lock；2) or the elastic locking card on core bar is arranged to lotus petal, that is, bottom is bored towards core bar Hand is pressed, the screens annular groove and screens ring that such elasticity locking card is set when being packed into housing inner cavity with housing inner cavity are in pawl Shape, assembling is difficult, is impacted by force using frock and into housing the lotus petal of elastic locking card is often caused to fracture, and scrappage is high. In addition, after its injection, although rollback core bar makes lotus petal type, elasticity locking card is stuck between screens annular groove and screens ring, Since lotus petal type elasticity locking card and screens ring are at this time into along dentation, rollback core bar is further reinforced, core bar is easy to be pulled out Go out, so as to which sharp keen needle point be taken out of from housing rear end portion, accidental needle sticks risk can be caused.

The utility model, fan-shaped retaining card are designed to down lotus shape, that is, bore bottom towards the direction of core bar upper piston, when When assembling core bar enters housing, fan-shaped retaining card is being in along dentation by housing inner cavity screens annular groove and screens ring, is promoting core Under the pressure of bar, the fan-shaped locking card sector-meeting that is unfolded naturally is collapsed to center, and the recovery when crossing screens ring with screens slot Naturally the state being unfolded.After injecting liquid drug, rollback core bar, the bottom surface quilt of the step plane of piston to fan-shaped retaining card It is firmly locked in the screens annular groove of housing rear end portion under the cooperation of the screens annular groove of screens ring and housing, core of further pulling back Bar, since the retaining card of core bar can not depart from, the design of easy-to-draw fracture belt in addition with the cooperation of screens ring in pawl shape, finally Core bar can only will be broken at easy-to-draw fracture belt.

3rd, in addition in the utility model, annular convex platform II is equipped in needle holder, annular convex platform II is used to prevent ring wedge from existing It comes off in transport concussion.

Description of the drawings

Fig. 1：The overall structure diagram (view before use) of the utility model.

Fig. 2：For the details enlarged drawing of Fig. 1.

Fig. 3：Jacket structure schematic diagram, wherein Fig. 3（a）For front view, Fig. 3（b）For top view.

Fig. 4（a）Core bar and piston assembling schematic diagram.

Fig. 4（b）Fan-shaped retaining card structure schematic diagram.

Fig. 5：Needle holder structure diagram, wherein Fig. 5（a）For front view, Fig. 5（b）For top view.

Fig. 6：Needle holder component drawings.

Fig. 7：Screens ring structure schematic diagram, wherein Fig. 7（a）For front view, Fig. 7（b）For top view..

Fig. 8：Syringe state diagram after injecting liquid drug.

Fig. 9：For Fig. 8 details enlarged drawings.

Figure 10：Rollback core bar drives ring wedge pull-down state figure.

Figure 11：The details enlarged drawing of Figure 10.

Figure 12：Syringe safe self-destruction state diagram.

Figure 13：For the details enlarged drawing of Figure 12.

In figure：1- housings, 11- screens annular grooves, 2- core bars, 21- barbs, 22- annular grooves, 23- sector retaining cards, 231- Line feeder muscle, 232- sector notch, 24- circles lift, the easy-to-draw fracture belts of 25-, and 26- presses hand, 3- pistons, 31- ring-shaped steps, 4- needle holders, 41- annular outers weir（Sealing ring）, 42- annulars inner convex platform I, 43- annulars inner convex platform II, 44- spring leafs, 5- Ring wedge, 51- ring ladders, 52- annular outer platforms, 53- elastic latchs, 6- screens rings, 61- screens ring annular inner convex platforms, 62- Screens ring annular outer platform, 7- needle tubings, 8- protective cases.

Specific embodiment

The utility model is described in detail in the following with reference to the drawings and specific embodiments.

As shown in figures 1-13, it is a kind of it is easy to assembly exempt from O-ring safety self-destructing syringe, including housing 1, core bar 2, living Plug 3, syringe needle holder assembly, needle tubing 7, protective case 8, screens ring 6, needle tubing 7 are fixed in syringe needle holder assembly, the cover dress of protective case 8 It is flexibly connected above needle tubing 7 with outer taper formation, syringe needle holder assembly is fixed in the inner cavity of 1 front end of housing, piston 3 On core bar 2, the main part of core bar 2 is sleeved in housing 1, the front end of the core bar 2 insertion needle holder assembly in injection In and the needle tubing 7 of syringe needle holder assembly and gluing in syringe needle holder assembly can be driven to retract together in housing 1, the syringe needle holder assembly It is made of needle holder 4 and ring wedge 5, ring wedge 5 is inserted into the inner cavity of needle holder 4 and passes through two ring ladders 51 thereon The spring leaf 44 of 4 lower part of needle holder is strutted syringe needle holder assembly being located in the front end inner cavity of housing 1；The syringe needle Hollow structure in seat 4, its underpart is equipped with no less than 3 spring leafs 44, in the increased periphery of 4 mid diameter of needle holder Annular outer weir 41 equipped at least one outwardly convex, for ensuring that needle holder 4 is not let out with 1 inner cavity wall surface fitted seal of housing It leaks, inner convex platform in larger annular inner convex platform I 42 and annular is respectively equipped in the increased cylindrical cavity of 4 mid diameter of needle holder Ⅱ43；The ring wedge 5 be interior hollow structure, 5 top of ring wedge be interior hollow circuit cylinder, the outer wall around interior hollow circuit cylinder head Face is equipped with the annular outer platform 52 of outwardly convex, and at least two is distributed with around interior hollow circuit cylinder head end mouth even circumferential Inwardly elastic latch 53 protruding upward, 5 lower outside of ring wedge are equipped in two outwards downward ring ladders 51.

In the utility model, 3 sealing shroud of piston is equipped with loaded on core bar 2 through the head of the core bar 2 of piston 3 Hook 21, the core bar 2 close to 3 lower section of piston are equipped with an annular groove 22, are set in annular groove 22 there are two fan-shaped retaining card 23, sector is stopped It moves back card 23 to be symmetrical arranged around the core bar 2 that diameter in annular groove 22 reduces, formation two is symmetrical between two fan-shaped retaining cards 23 Sector notch 231, the radius of fan-shaped retaining card 23 is more than the radius of the circumference formed at screens ring annular inner convex platform 61； The lower section of annular groove 22 is equipped with easy-to-draw fracture belt 25.Forming the top surface of the upper wall surface of annular groove 22 and two fan-shaped retaining cards 23 Between be respectively equipped with a longitudinally reinforced line muscle 231, for enhancing the reverse drawing drag of fan-shaped retaining card 23.

In addition, the sector notch 232 is 100 ± 5 degree.3 lower end of piston is equipped with annular in one week around outside wall surface Step, step height are not less than 1.5mm, and the terrace of step is plane without chamfering.The piston 3 is mounted on core bar annular groove The circle that top surface is formed is lifted on 24, and circle lifts 24 diameters and is slightly less than 3 bottom surface outer diameter of piston, simultaneously greater than in 3 bottom surface of piston The diameter of chamber.6 activity of screens ring is assemblied in the screens annular groove of 1 rear end portion of housing.

The specific implementation process of the utility model is:The main part of core bar is sleeved in housing, is noted after drawing liquid It penetrates, the barb of the leading head of core bar, which is inserted into ring wedge in injection and is formed with elastic latch, to be buckled to, core bar of pulling back, core bar Drive ring wedge, ring wedge that needle holder and needle tubing is driven to return back in housing inner cavity, and the step plane of piston is to fan-shaped card Bottom surface be locked under the cooperation of screens ring and the screens annular groove of housing in the screens annular groove of housing rear end portion, it is further to draw Dynamic core bar, core bar will be broken outside easy-to-draw fracture belt, and thus the utility model realizes syringe self-destruction and to the sharp keen of needle tubing Needle point safety protection function, so as to effectively prevent the reuse of syringe and avoid the risk of accidental needle sticks harm.

The basic principle, main feature and advantage of the utility model has been shown and described above.The ordinary skill of this field Personnel are not it should be appreciated that above-described embodiment limits the scope of protection of the utility model, all use equivalent substitutions etc. in any form The technical solution that mode is obtained, falls in the scope of protection of the utility model.

It is same as the prior art or the prior art can be used realized that the utility model is not directed to part.

Claims (7)

1. it is a kind of it is easy to assembly exempt from O-ring safety self-destructing syringe, including housing（1）, core bar（2）, piston（3）, syringe needle Holder assembly, needle tubing（7）, protective case（8）, screens ring（6）, needle tubing（7）It is fixed in syringe needle holder assembly, protective case（8）Cover Mounted in needle tubing（7）Top is flexibly connected with outer taper formation, and syringe needle holder assembly is fixed on housing（1）The inner cavity of front end In, piston（3）Mounted on core bar（2）On, core bar（2）Main part be sleeved on housing（1）In, core bar（2）Front end noting In insertion needle holder assembly and the needle tubing of syringe needle holder assembly and gluing in syringe needle holder assembly can be driven when penetrating（7）It retracts together outer Set（1）In, it is characterized in that the syringe needle holder assembly is by needle holder（4）And ring wedge（5）Composition, ring wedge（5）It is inserted into syringe needle Seat（4）Inner cavity in and pass through two ring ladders thereon（51）By needle holder（4）The spring leaf of lower part（44）Strut from And syringe needle holder assembly is located in housing（1）Front end inner cavity in；The needle holder（4）Interior hollow structure, its underpart are equipped with not Less than 3 spring leafs（44）, in needle holder（4）The increased periphery of mid diameter is equipped at least one outwardly convex Annular outer weir（41）, for ensuring needle holder（4）With housing（1）Inner cavity wall surface fitted seal does not leak, needle holder（4）Middle part Larger annular inner convex platform I is respectively equipped in the increased cylindrical cavity of diameter（42）With annular inner convex platform II（43）；The ring Shape wedge（5）For interior hollow structure, ring wedge（5）Top is interior hollow circuit cylinder, and the outside wall surface around interior hollow circuit cylinder head is equipped with The annular outer platform of outwardly convex（52）, and it is inside around interior hollow circuit cylinder head end mouth even circumferential at least two to be distributed with Elastic latch protruding upward（53）, ring wedge（5）Lower outside is equipped in two outwards downward ring ladders（51）.

2. it is according to claim 1 it is easy to assembly exempt from O-ring safety self-destructing syringe, it is characterized in that the piston （3）Sealing shroud is loaded on core bar（2）On, through piston（3）Core bar（2）Head be equipped with barb（21）, close to piston（3）Lower section Core bar（2）It is equipped with an annular groove（22）, annular groove（22）In set that there are two fan-shaped retaining cards（23）, fan-shaped retaining card（23） Around annular groove（22）The core bar that middle diameter reduces（2）It is symmetrical arranged, two fan-shaped retaining cards（23）Between formed two it is symmetrical Sector notch（232）, fan-shaped retaining card（23）Radius be more than screens ring annular inner convex platform（61）Locate the half of the circumference formed Footpath；In annular groove（22）Lower section be equipped with easy-to-draw fracture belt（25）.

3. it is according to claim 2 it is easy to assembly exempt from O-ring safety self-destructing syringe, it is characterized in that forming annular groove （22）Upper wall surface and two fan-shaped retaining cards（23）Top surface between be respectively equipped with a longitudinally reinforced line muscle（231）, it is used for The fan-shaped retaining card of enhancing（23）Reverse drawing drag.

4. it is according to claim 2 it is easy to assembly exempt from O-ring safety self-destructing syringe, fan-shaped lacked it is characterized in that described Mouthful（232）For 100 ± 5 degree.

5. it is according to claim 1 or 2 it is easy to assembly exempt from O-ring safety self-destructing syringe, it is characterized in that the work Plug（3）Lower end was equipped with ring-shaped step around outside wall surface one week, and step height is not less than 1.5mm, the terrace of step be plane without Chamfering.

6. it is according to claim 1 or 2 it is easy to assembly exempt from O-ring safety self-destructing syringe, it is characterized in that the work Plug（3）The circle for being mounted on the top surface composition of core bar annular groove lifts（24）On, circle lifts（24）Diameter is slightly less than piston （3）Bottom surface outer diameter, simultaneously greater than piston（3）The diameter of bottom surface inner cavity.

7. it is according to claim 1 or 2 it is easy to assembly exempt from O-ring safety self-destructing syringe, it is characterized in that the card Position ring（6）Activity is assemblied in housing（1）In the screens annular groove of rear end portion.