CN202516113U - High-reliability self-destruction syringe with normal capacity dependent on position of spring - Google Patents

Abstract

A high-reliability self-destruction syringe with normal capacity dependent on the position of a spring comprises a jacket (1), a core rod (2), a piston (3) and the spring (4). The high-reliability self-destruction syringe is characterized in that a self-destruction characteristic area (22) and a self-destruction boss (21) for limiting the spring (4) are arranged at the front end of the core rod (2), the length of the self-destruction characteristic area (22) is matched with the axial length of the spring (4), the piston (3) matched with an inner cavity of the jacket (1) is sleeved at a core-rod end of the front end of the self-destruction boss (21), a clamped structure (23) for controlling movement of the spring (4) is arranged on the core rod (2) and consists of a plurality of conical steps which are coaxial with the core rod (2) and are sequentially stacked from front to back, the spring (4) is movably clamped on the clamped structure (23), and the initial assembly position of the spring (4) on the clamped structure (23) is determined by the requirement on injection dose of liquid medicine. The length of the clamped structure (23) is sufficient, so that when the core rod (2) assembled with the piston (3) is pushed to the sealed bottom of the inner cavity of a barrel of the jacket (1), the last conical step (232) of the clamped structure extends all along to reach a tail curl edge (12) of the jacket (1) or to be close to the tail curl edge (12) of the jacket (1), and even if the spring (4) is combined with the same core rod (2), syringes with different sizes can be designed by changing the assembly position of the spring (4) on the clamped structure (23) of the core rod. The core rod is high in universality, and the high-reliability self-destruction syringe is low in manufacturing cost, accurate in dosage, good in backstop effect and high in reliability.

Description

Nominal capacity depends on the high reliability self-destruction syringe of reed position

Technical field

This utility model relates to a kind of medical apparatus and instruments, especially a kind of disposable syringe, and specifically a kind of nominal capacity depends on the high reliability self-destruction syringe of reed position.

Background technology

In China and global scope; Being designed to disposable syringe products is preventing overflow of drugs, particularly all is being helpful aspect the propagation that prevents communicate illness; But because some medical institutions' mismanagements or interests drive; The disposable syringe of this quasi-tradition is being recovered, is peddling and reusing, thereby the secondary cross infection of pathogenic bacteria occurs, makes diseases such as hepatitis B, AIDS obtain propagation.

People have made many trials and have made such problem up; Ask for something during these are attempted has a special action; With through on syringe, weak section being set so that syringe can become and can not use through applying power, promptly allow through the syringe user one deliberately action destroy or eliminate the function of use of syringe.Quite work when the injector designed of even now is many; But they need user to give special heed to really and take actual action to damage subsequently or syringe can not be used, and neither one can work to the user that has special intention will reuse this syringe during these were attempted.

At present; People have developed and aspect user, need not the Single-Use Auto-Disable Syringes that any additional move just can become and can not use or can not further use; Use very uncomfortable etc. shortcoming but these self-destruction syringes remain at complex structure, change very big, medical worker with conventional syringe contrast in the use; Particularly low dose of syringe also exists many designs such as the accuracy of manufacture is high, difficulty of processing is big not enough like fixed dosage vaccine syringe, insulin syringe etc.For this reason; Chinese patent CN 2873231Y discloses a kind of Single-Use Auto-Disable Syringes; This syringe has solved the problems referred to above to a certain extent; But it still exists following design not enough: 1. visible like this patent specification accompanying drawing 3; The injecting liquid drug dosage of this syringe (being the specification of syringe) is seen in this patent specification accompanying drawing 1 that by the residing initial position decision of non-return steel disc the back segment as the final vacuum of syringe absorption medicinal liquid on the core bar can move position 12 again; Be designed to the level and smooth core bar of the reduced of one section fixed length; Make this syringe before use, non-return steel disc initial position can only be assemblied in the intersection that also can only be in this level and smooth core bar district with the back segment limited step, and promptly the non-return steel disc initial position of this syringe has been designed qualification in the dust; And the scale of fixed dosage vaccine syringe is not done the qualification of minimum length according to China industry standard YY0573.3 standard, can be designed to general for practicing thrift manufacturing cost for its overcoat of vaccine syringe, the core bar mould of different size (as: 0.05ml, 0.1ml, 0.2ml, 0.3ml, 0.4ml, 0.5ml etc.) as manufacturer.Analyze from here; The disclosed a kind of Single-Use Auto-Disable Syringes of Chinese patent CN 2873231Y; Because the initial position of its non-return steel disc assembling can not change because of unreasonable being defined extremely of structural design of core bar; Causing can't be general for its core bar of the vaccine syringe that different ID requirements are arranged; The vaccine syringe core bar of different size must be again die sinking tool separately, this has increased the manufacturing cost of syringe greatly, will carry out produced by separation, management as the production management aspect for the syringe purchase order of different size in addition; Perhaps be difficult to carry out stock's deposit of core bar accessory production in advance for the syringe purchase order company of the unknown, these all can add major company and produce and administrative expenses.

2. this syringe before use, the non-return steel disc is to be assemblied in the rear end can move on the level and smooth core bar at position, syringe probably causes drawing medicinal liquid and produces dose error because of transportation concussion makes the non-return steel disc produce displacement in transportation.In addition, this type of syringe also has the non-return steel disc to be assemblied in to be designed on the screw-shaped core bar, and such syringe possibly cause drawing medicinal liquid and produces dose error equally in transportation because of the transportation concussion make the non-return steel disc produce displacement.

3. the length that the leading portion that is used to observe blood back can move the position exceeds the 2.5mm to 3.5mm of non-return steel disc length; This formed space of distance that exceeds enough is bigger than the space of 0.05ml, and (as: with the syringe of 1ml dosage is that example is calculated; The minimum scale total length of regulation 1ML syringe is for being not less than 57mm in the standard GB 15810; Satisfying profit-push maximization under the situation of standard-required as manufacturer; Usually 1ml syringe scale total length is decided to be 58mm; Can calculate length of the scale=< the 58mm ÷ 1ml * 0.05ml >=2.9mm) of 0.05ml thus, still can be utilized to carry out the injection of the low dose of medicinal liquid of 0.05ml after examination must cause the predetermined dose ejection of syringe to finish by bad people.

In addition; Present such syringe is non-return weak effect of ubiquity or the big problem of injection resistance also; Because the non-return steel disc is to lean on several claws that are on the same circumference to thrust outer casing inner wall to prevent what core bar from pulling back, its all claw length of the claw on the same circumference are that design is consistent, and it is dark that the length of claw Design of length is promptly thrust the outer casing inner wall degree of depth; Then the injector to inject resistance is just very big; Such syringe sliding capability often just satisfies the minimum requirements of stipulating in the industry standard, has particularly changed the injection force that medical personnel are accustomed to using, and is not easy to operation of medical workers; The weak point of claw Design of length promptly thrusts the outer casing inner wall depth as shallow; Then the stopping power of non-return steel disc is little; The core bar of after injector to inject finishes, pulling back; The non-return steel disc can have an amplitude of retreating downslide thereupon, can form the space that can draw medicinal liquid at the overcoat front end and the piston space of syringe, and this space is for the low dose of injection of part enough (like the dosage of 0.05ml, 0.1ml); Very big potential safety hazard will be caused if be used after the lawless person reclaims, self-destruction truly can not be realized.This still there is not good solution at present.

Summary of the invention

The purpose of this utility model is that the core bar versatility that exists to existing disposable self-destruction syringe is poor, manufacturing cost high, dosage is inaccurate and stopping weak effect or the big problem of injection resistance, designs the high reliability self-destruction syringe that a kind of nominal capacity depends on the reed position.

The technical scheme of this utility model is:

A kind of nominal capacity depends on the high reliability self-destruction syringe of reed position; Comprise overcoat 1, core bar 2, piston 3, reed 4, needle tubing 5 and sheath 6; Described overcoat 1 front end is provided with needle stand 11, and needle stand 11 and overcoat 1 are injected into one or gluing and are one, and described needle tubing 5 is fixed in the needle stand 11; Described core bar 2 places overcoat 1; It is characterized in that described core bar 2 front ends are provided with self-destruction characteristic district 22 and to the self-destruction boss 21 of 4 position-limiting actions of reed, the length in self-destruction characteristic district 22 and the axial length of reed 4 match, be set with on the core bar end of self-destruction boss 21 front ends one with the piston 3 of overcoat 1 inner chamber coupling; Core bar 2 be provided with the motion of control reed 4 by card structure 23; By card structure 23 by with core bar 2 concentrics several by after going to successively the folded circular cone step of buttress constitute, reed 4 movably is installed in described by on the card structure 23, it is to be decided by the requirement of injecting liquid drug dosage that reed 4 is assemblied in by the initial position on the card structure 23.

Described had sufficient length by card structure 23; When the core bar that is equipped with piston 32 pushes overcoat 1 cylinder lumen back cover; Extended by last circular cone step 232 of card structure always and to arrive or near overcoat 1 afterbody crimping 12 places; Thereby when making 2 combinations of same core bar of reed 4 and this, be assemblied in this core bar can be designed to different size by the diverse location of card structure 23 syringe as long as change reed 4.

The specification of described syringe is 0.05ml, 0.1ml, 0.2ml, 0.3ml, 0.4ml, 0.5ml etc.

Described reed 4 tops are to have the open tubular column 41 that assembles breach; Open tubular column 41 cylinder design are that vertical direction circle shape or stupefied shape or circle shape combine with stupefied shape; Card 42 and wild card 43 in reed 4 bottoms are arranged at intervals with; In card 42 introversions be used to be stuck in core bar 2 correspondence by at the bottom of the awl of the circular cone step of card structure, wild card 43 abductions are used to be stuck in the inwall of overcoat 1; Each is provided with described wild card 43 at least in the inwall that two pieces of claws 431 thrust overcoat 1 preventing and moves back thereafter; The length of all claws 431 is different; It is that all claw 431 integral body are on the gradual inwall that is stuck in overcoat 1 of level on two different circumference of concentric that the pawl end of all claws 431 is distributed in reed 4 at least; The angle that each wild card 43 abduction of described reed 4 and its axial line form is 15～60 degree.

What described reed 41 was assemblied in core bar 2 by the direction on the card structure 23 is: reed 4 not with an end of claw direction towards piston 3, reed 4 has an end of claw is pressed hands 24 towards core bar direction.

Described self-destruction boss 21 cross sections are circle, rectangle, ellipse or polygon, and its diameter or maximum gauge be greater than open tubular column 41 diameters or the maximum gauge of reed 4, and less than the diameter of overcoat 1 inner chamber.

Described self-destruction characteristic district 22 at the self-destruction boss 21 of core bar end and by card structure 23 between; Self-destruction characteristic district 22 surface smoothings are cylindric; Its diameter with equated by the end diameter of the circular cone step of card structure 23; Its length A is slightly larger than the vertical dimension B of card 42 bottom surfaces to reed 4 end faces in the reed 4; So that but syringe pumpback core bar 2 before human body is carried out injecting liquid drug forms a space that is used to observe blood back at the medicinal liquid front end, and this spatial volume is not more than the half the of the specified minimum dose 0.05ml of vaccine injection.

Syringe before use; Piston 3 is in the back cover end of overcoat 1 inner chamber; Reed 4 be assemblied in core bar 2 by on the card structure 23 and be in the below of syringe nominal capacity graduation mark 14; The distance of its reed 4 upper edges to nominal capacity graduation mark 14 equals the distance C of piston datum line to self-destruction boss bottom surface and adds (5 ± 2) mm, and the formed space of distance of (5 ± 2) mm is wherein promptly expected and do to be drawn the space that the medicinal liquid final vacuum is used.

The end of described core bar 2 is provided with presses hands 24, presses hands 24 and is connected through a reinforcement 25 between the card structure 23.

The open tubular column 41 on described reed 4 tops is provided with the false boss 44 of being convenient to automatization's assembling production usefulness.

The beneficial effect of this utility model is:

1, core bar is used in this syringe and is had very strong versatility: before the design syringe is being launched; The initial position of reed be assemblied in core bar by (the injecting liquid drug dosage of the initial position of reed decision syringe) on the card structure; Had sufficient length by the card structure design, when the self-destruction syringe of different ID requirements being arranged, do not need again die sinking tool separately in production; As long as when assembling, select reed to be assemblied in core bar by the different installation sites of card structure; Just can make syringe become the product of different sizes such as 0.05ml, 0.1ml, 0.2ml, 0.3ml, 0.4ml, 0.5ml, so not only make things convenient for production, can farthest reduce cost again; Thereby reduce the expense of accepting the injection patient, be convenient to the popularization of new product.

2, the initial position of reed be assemblied in core bar by on the card structure, have effect shockproof, that be convenient to transport, can not cause drawing medicinal liquid and produce dose error because of transportation concussion make reed produce displacement.

3, the cooperating of the size of card 42 bottom surfaces to reed 4 end face vertical dimension B in the size of the length A in appropriate design self-destruction characteristic district and the reed 4, both guaranteed that syringe has the space that can observe blood back, made syringe after use, can not produce the risk that to utilize again again.

4, the claw pawl end through the design retaining reed is distributed on the different circumference with the reed concentric; Be that the claw Design of length is not quite identical; Thrusting the outer casing inner wall degree of depth is that the shallow gradual stopping that is level deeply that has is arranged; And the angle angle that designs wild card and its axial line again, make the right the best of carving between claw and the outer casing inner wall, both guaranteed that syringe had the good sliding capability that conformance with standard requires; Particularly do not change the injection force that the medical worker is accustomed to using, can not produce the disposable injection of syringe yet and use back reed, core bar can retreat and make syringe that the risk that can utilize again arranged.

5, reed increase the false boss design (difficult point of automatization's assembling is exactly: accessory to be assembled must have is convenient to the design of locating, sorting, on the contrary accessory can be transmitted with unordered state, and even assemble not in place, assembling and put upside down; Learies is increased); Be convenient to location, ordering in the automatic assembling system, transmit,, at utmost reduce and scrap with the automatic assembling that is well on; Increase production capacity, raise the efficiency.

Description of drawings

Fig. 1 (a) is the contour structures sketch map of this utility model.

Fig. 1 (b) is the sectional structure sketch map of Fig. 1 (a).

Fig. 2 (a) is the structural representation of overcoat.

Fig. 2 (b) is the sectional structure sketch map of Fig. 2 (a).

Fig. 3 is the structural representation of the core bar of this utility model.

Fig. 4 (a) is the structural representation of facing of reed.

Fig. 4 (b) is the plan structure sketch map of (a).

Fig. 4 (c) is the backsight structural representation of reed.

Fig. 5 is the structure of piston sketch map of this utility model.

Fig. 6 is the operating process sketch map of this utility model.

Among the figure: 1, overcoat; 2, core bar; 3, piston; 4, reed; 5, needle tubing; 6, sheath; 11, needle stand; 12, crimping; 13, zero graduation line; 14, nominal capacity graduation mark; 21, self-destruction boss; 22, self-destruction characteristic district; 24, press hands; 25, reinforcement; 23, by card structure; 231, by each circular cone step of card structure; 232, by last circular cone step of card structure; 233, at the bottom of the awl of circular cone step; 41, open tubular column; 42, interior card; 43, wild card; 431, claw; 44, false boss.31, sealing ring; 32, datum line.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is further described.

Shown in Fig. 1-5.

A kind of nominal capacity depends on the high reliability self-destruction syringe of reed position, comprises overcoat 1, core bar 2, piston 3, reed 4, needle tubing 5 and sheath 6.Described overcoat 1 front end is provided with needle stand 11; Needle stand 11 and overcoat 1 are injected into one or gluing and are one; Overcoat 1 is provided with zero graduation line 13 and nominal capacity graduation mark 14, and described needle tubing 5 directly is adhesively fixed and fixes in the needle stand 11 of overcoat 1 front end, so that low-residual behind the injecting liquid drug.Described core bar 2 places overcoat 1; The front end of core bar 2 is provided with self-destruction boss 21, self-destruction characteristic district 22; Piston 3 is set on core bar 2 ends of self-destruction boss 21 front ends of core bar 2, and core bar 2 can promote axially motion in piston 3 its external sleeve 1 inner chamber, core bar 2 be provided with 3 motions of control reed by card structure 23; The end of core bar 2 also be provided be convenient to injection operation press hands 24, by hands 24 and be provided with reinforcement 25 between the card structure 23 to strengthen the push-and-pull stability of core bar 2 in injection is used.Described by card structure 23 by with core bar 2 concentrics several by after going to successively the folded circular cone step of buttress constitute; All constitute, and it highly all equates by the circular cone step of card structure 23; Its outside diameter equates that all its end diameter equates all that also reed 4 movably is installed in described by on the card structure 23; Reed 4 is assemblied in by the direction on the card structure 23: reed 4 not with an end of claw direction towards piston 3, reed 4 has an end of claw is pressed hands 24 towards core bar direction.Syringe before use; The initial position of reed 4 be assemblied in core bar 2 by on the card structure 23; Reed 4 is assemblied in by the initial position on the card structure 23 to be decided by the requirement of injecting liquid drug dosage; Described had sufficient length by card structure 23, when the core bar that is equipped with piston 32 pushes overcoat 1 cylinder lumen back cover, extended by last circular cone step 232 of card structure always and to arrive or near overcoat 1 afterbody crimping 12 places; Thereby when making 2 combinations of same core bar of reed 4 and this; Be assemblied in this core bar and can be designed to the syringe (as: 0.05ml, 0.1ml, 0.2ml, 0.3ml, 0.4ml, 0.5ml etc.) of different size as long as change reed 4 by the diverse location of card structure 23, simultaneously since the initial position of reed 4 be assemblied in core bar 2 by on the card structure 23, and reed 4 with by the good fit property of the circular cone step of card structure 23 assembling; Have the transportation antihunt action, can not cause drawing medicinal liquid and produce dose error because of the initial rigging position of transportation concussion change reed 4.Described reed 4 tops are to have the open tubular column 41 that assembles breach; Open tubular column 41 cylinder design are that vertical direction circle shape or stupefied shape or circle shape combine with stupefied shape; Reed 4 bottoms are that 42 and 2 wild cards 43 are blocked on top in 3 that extend below; In card 42 be set in distance with wild card 43, interior card 42 introversions be used to be stuck in core bar 2 correspondence by at the bottom of the awl of the circular cone step of card structure 233, wild card 43 abductions are used to be stuck in the inwall of overcoat 1.The angle that described wild card 43 abductions and axial line form is 15～60 degree, to guarantee the anti-inflection power of wild card 43.Each is provided with wild card 43 at least in the inwall that two pieces of claws 431 thrust overcoat 1 preventing and moves back thereafter; Connect with circular arc between the adjacent claw 431; The length of all claws 431 is not quite identical; The pawl end of all claws 431 be distributed at least with reed 4 on two different circumference of concentric, its degree of depth of thrusting overcoat 1 inwall is that the shallow gradual inwall that is stuck in overcoat 1 that is level deeply that has is arranged, and makes the right the best of carving between claw 431 and overcoat 1 inwall; Both guaranteed that syringe had the good sliding capability that conformance with standard requires; Particularly do not change the injection force that the medical worker is accustomed to using, guarantee that again reed 3 has good stopping power, can not produce the disposable injection of syringe and use back core bar 2 to retreat to make syringe that the risk that can utilize again arranged.Described self-destruction boss 21 cross sections are circle, rectangle, ellipse or polygon, and its diameter or maximum gauge be greater than open tubular column 41 diameters or the maximum gauge of reed 4, and less than the diameter of overcoat 1 inner chamber.Self-destruction boss 21 and formed self-destruction characteristic district 22 between the card structure 23; Self-destruction characteristic district 22 is cylindric; Its diameter with equated by the end diameter of card structure 23; Its length A is slightly larger than the vertical dimension B of card 42 bottom surfaces to reed 4 end faces in the reed 4, but so that syringe pumpback core bar before human body is carried out injecting liquid drug forms a space that is used to observe blood back at the medicinal liquid front end, and this spatial volume is not more than the half the of the specified minimum dose 0.05ml of vaccine injection.

As shown in Figure 5, described piston 3 is provided with and is no less than two elastic seal rings 31, and with guarantee that piston 3 cooperates with overcoat 1 inner chamber time sealing, the toroid of the end face of piston 3 is a datum line 32, is used for confirming and the corresponding capacity of syringe graduation reading.

During practical implementation, for the ease of automated production, can reed 4 tops open tubular column 41 on be provided with and be convenient to automatic assembly equipment and be used to locate, sort to carry out to its false boss 44 of assembling smoothly.

Syringe before use; Piston 3 is in the back cover end of overcoat 1 cylinder lumen; Reed 4 be assemblied in core bar 2 by on the card structure 23 and be in the below of syringe nominal capacity graduation mark 14; The distance of its reed 4 upper edges to nominal capacity graduation mark 14 equals the distance C of piston datum line to self-destruction boss bottom surface and adds (5 ± 2) mm, and the formed space of distance of (5 ± 2) mm is wherein promptly expected and do to be drawn the space that the medicinal liquid final vacuum is used.

When the capacity medicinal liquid of nominal capacity is satisfied in absorption; Reed 4 just slips in the self-destruction characteristic district 22; Be that the syringe self-destroying function will start with the beginning of medicinal liquid aerofluxus, injection at once, after injecting liquid drug finishes, reed 4 arrival final positions; At this moment; The core bar 2 of overcoat 1 cylindrical shell length receives the synergy of reed 4, self-destruction boss 21, outer casing inner wall locked in the inner chamber of overcoat 1 cylindrical shell together with piston 3 no better than, can't the risk that can utilize again be arranged rollback generation syringe, realizes the self-destruction of the real meaning of syringe thus.

The change in location of reed 4 is as shown in Figure 6 in the use of this utility model.

This utility model does not relate to all identical with the prior art prior art that maybe can adopt of part to be realized.

Claims (9)

1. a nominal capacity depends on the high reliability self-destruction syringe of reed position; Comprise overcoat (1), core bar (2), piston (3), reed (4), needle tubing (5) and sheath (6); Described overcoat (1) front end is provided with needle stand (11); Needle stand (11) and overcoat (1) are injected into one or gluing and are one; Described needle tubing (5) is fixed in the needle stand (11); Described core bar (2) places overcoat (1), it is characterized in that described core bar (2) front end is provided with self-destruction characteristic district (22) and reed (4) is played the self-destruction boss (21) of position-limiting action, and the axial length of the length in self-destruction characteristic district (22) and reed (4) matches; Be set with on the core bar end of self-destruction boss (21) front end one with the piston (3) of overcoat (1) inner chamber coupling; Core bar (2) be provided with control reed (4) motion by card structure (23), by card structure (23) by with core bar (2) concentric several by after going to successively the folded circular cone step of buttress constitute, reed (4) movably is installed in described by on the card structure (23); When the core bar that is equipped with piston (3) (2) pushes overcoat (1) cylinder lumen back cover; Extended by last circular cone step (232) of card structure (23) always and to arrive or locate near overcoat (1) afterbody crimping (12); Thereby when making reed (4), be assemblied in this core bar can be designed to different size by the diverse location of card structure (23) syringe as long as change reed (4) with this same core bar (2) combination.

2. nominal capacity according to claim 1 depends on the high reliability self-destruction syringe of reed position, and the specification that it is characterized in that described syringe is 0.05ml, 0.1ml, 0.2ml, 0.3ml, 0.4ml or 0.5ml.

3. nominal capacity according to claim 1 depends on the high reliability self-destruction syringe of reed position; It is characterized in that described reed (4) top is to have the open tubular column (41) that assembles breach; Open tubular column (41) cylinder design is that vertical direction circle shape or stupefied shape or circle shape combine with stupefied shape; Reed (4) bottom is arranged at intervals with interior card (42) and wild card (43); In card (42) introversion be used to be stuck in core bar (2) correspondence by at the bottom of the awl of the circular cone step of card structure, wild card (43) abduction is used to be stuck in the inwall of overcoat (1); Each is provided with described wild card (43) at least in the inwall that two pieces of claws (431) thrust overcoat (1) preventing and moves back thereafter; The length of all claws (431) is different; It is that all claws (331) integral body is on the gradual inwall that is stuck in overcoat (1) of level on two different circumference of concentric that the pawl end of all claws (431) is distributed in reed (4) at least; The angle that each wild card (43) abduction of described reed (4) and its axial line form is 15～60 degree.

4. nominal capacity according to claim 1 depends on the high reliability self-destruction syringe of reed position; It is characterized in that the direction by on the card structure (23) that described reed (41) is assemblied in core bar (2) is: reed (4) not with an end of claw direction towards piston (3), the end that reed (4) has a claw is pressed the direction of hands (24) towards core bar.

5. nominal capacity according to claim 1 depends on the high reliability self-destruction syringe of reed position; It is characterized in that described self-destruction boss (21) cross section is circle, rectangle, ellipse or polygon; Its diameter or maximum gauge be greater than open tubular column (41) diameter or the maximum gauge of reed (4), and less than the diameter of overcoat (1) inner chamber.

6. nominal capacity according to claim 1 depends on the high reliability self-destruction syringe of reed position; It is characterized in that described self-destruction characteristic district (22) is positioned at the self-destruction boss (21) of core bar end and by between the card structure (23); Self-destruction characteristic district (22) surface smoothing is cylindric; Its diameter with equated by the end diameter of the circular cone step of card structure (23); Its length A is slightly larger than the vertical dimension B of card (42) bottom surface to reed (4) end face in the reed (4); So that but syringe pumpback core bar (2) before human body is carried out injecting liquid drug forms a space that is used to observe blood back at the medicinal liquid front end, and this spatial volume is not more than the half the of the specified minimum dose 0.05ml of vaccine injection.

7. nominal capacity according to claim 1 depends on the high reliability self-destruction syringe of reed position; It is characterized in that syringe before use; Piston (3) is in the back cover end of overcoat (1) inner chamber; Reed (4) is assemblied in the below of being gone up and be in syringe nominal capacity graduation mark (14) by card structure (23) of core bar (2); The distance of its reed (4) upper edge to nominal capacity graduation mark (14) equals the distance C of piston datum line to self-destruction boss bottom surface and adds 5 ± 2mm, and the formed space of the distance of 5 ± 2mm is wherein promptly expected and do to be drawn the space that the medicinal liquid final vacuum is used.

8. nominal capacity according to claim 1 depends on the high reliability self-destruction syringe of reed position; The end that it is characterized in that described core bar (2) is provided with presses hands (24), presses hands (24) and is connected through a reinforcement (25) between the card structure (23).

9. nominal capacity according to claim 1 depends on the high reliability self-destruction syringe of reed position, it is characterized in that the open tubular column (41) on described reed (4) top is provided with the false boss (44) of being convenient to automatization's assembling production usefulness.

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