CN101360527A - Safety syringe with plunger locking means - Google Patents

Abstract

A safety syringe (11) is disclosed. The safety syringe has a retractable needle facility (14/15) incorporated therein, the syringe comprising a barrel (12) and plunger (13) and needle assembly. The needle is caused to retract into the barrel of the syringe upon completion of injection once it has been used, by means of engagement between the needle assembly and the end of the plunger. Locking means (28) preferably in the form of a locking bush is provided in the body of the syringe to engage the plunger once it is retracted after use, so that the syringe is rendered incapable of being used further.

Description

Safety injector with plunger locking means

Technical field

The present invention relates to a kind of safety injector, to be used for medical treatment or dental industry or to be used for individual administration, so that after using pin, protect internist, surgeon or other pins operator in case be subjected to the injury of pin with retractible pin.The invention particularly relates to a kind of locking device, being used for to connect the plunger of pin, and, remain in the retracted position thus with pin.

Background technology

The medical practitioner is to confirm really owing to using pin to be subjected to from the injury of HIV or hepatitis B virus and the danger of PI in the common procedure of their work.

In addition, can there be the substantial risk that contact specific virus in the people of custom self-administer, if perhaps reuse once exhausted pin with disinfectant form not, just exists so really to contact other viral substantial risks.

Have many purposes to be to reduce the instrument of carrying of so-called pricking wound quantity, and carried out various trials a kind of this class security system of exhausted pin once that is used to handle is provided, but this existing proposal all there is deficiency.

The multiple solution of foregoing problems provides retractible pin.Though topmost shortcoming is that syringe causes initial safety by making the pin regracting in the proposal before a lot, the common device that is not provided for preventing once more near pin.In other words, syringe can be depressed once more, impels pin to expose from the cylindrical shell of syringe once more, perhaps in other the example, can be withdrawed from from the cylindrical shell of syringe fully, obtains approaching to pin whereby.

Goal of the invention

The purpose of this invention is to provide a kind of syringe, it is by using retractible acus, and in case use, and for good and all stores this acus with the abundant mode of safety, solves to a certain extent or improves part or all of aforesaid drawbacks at least.More particularly, the invention provides a kind of absolute locking device,, prevent from that the plunger that pin connected of withdrawing is resumed to use or even all withdrawals to cause when safe by making pin withdrawal when syringe.At least the invention provides a kind of alternative device, be used to hold the pin of the syringe that has used,, just be protected from the unexpected injury that produces owing to unnecessary contact with the pin that exposes in case syringe uses.

Though following description is usually directed to the syringe of stock size, do not mean thus restriction, and the reference of syringe refers to and comprises any other pin/syringe conjugate or independent pin, comprise slimline syringes, herein, by suitable adaptation, the present invention also can be used effectively.

Summary of the invention

According to the present invention, a kind of safety injector is provided, it has the retractible pin equipment that is included in wherein, syringe comprises cylindrical shell and plunger and needle assembly, when wherein in a single day pin is used to complete injection, just by means of the engagement between needle assembly and the plunger end, and impelled in the cylindrical shell that is retracted to syringe, and wherein be provided with locking device in syringe body, the engagement plunger makes to cause syringe not to be used further during with withdrawal plunger after use.

In this sense, cause syringe further not use to mean syringe can not be pushed away once more recovering to use (reactive) pin downwards, it can not be removed by the cylindrical shell from syringe again fully to obtain approaching to pin.

Weak section can preferably be set in syringe, be positioned on the axle of plunger, be positioned at when being contracted fully near the end extended spot of syringe body, make and be retracted in the main body of syringe at pin, and after plunger and the locking device engagement, plunger can be fractureed, so that plunger can not be compressed into once more, or, further auxiliaryly thus cause syringe not to be used again by catching it and applying power and easily it is removed.

Be understandable that,, be understandable that this is the step that extra step and some user may be ignored when the present invention is also improved demonstrably by the ability of the plunger that fractures.Therefore, can be preferred, locking device has enough resistances and is pressed into or removes to prevent plunger, so that no matter whether plunger fractures all unimportant.In other words, even before plunger is fractureed, the present invention imagine syringe will be caused invalid with prevent deliberate or even reuse unexpectedly, for example, if when syringe is placed on the table, knocked, just may this thing happens.

Can preferably by lining (bush) locking device be set, this lining is positioned at the plunger of injector cartridge from the end of its extension.

This lining can be division lining (split bush) or entity lining (solid bush), though have been found that having division in lining can be easy to be installed to cylindrical shell and advantageous particularly.Lining during being found in the manufacturing of syringe, the division lining provides easier installation, because need be mounted after plunger is inserted in the cylindrical shell.By the division that is provided with, the axle that lining can be made with around plunger is installed, and can be made and reduce diameter with in being pressed into cylindrical shell the time, and by be clasped (snap fit) to cylindrical shell be designed hold in the interior zone of this lining.

In case plunger has meshed pin and when impelling it to be retracted in the injector cartridge, any plunger that meshes during lining can make and in all sorts of ways comprises, but not necessarily is confined to, and is the same with this situation, reverse or spur plunger by or enter lining.In needing those linings of twist motion, lining can be twistlock (twist-lock) lining or screw-thread bush, maybe can be road strategic point lock (luer lock) lining.

Both select a ground, and in the embodiment of needs pulling motion, lining can be zip (pull-lock) lining or snap-lock bush (snap-lock bush).The example of these linings is displayed in the corresponding accompanying drawing, and describes contrast discussion with corresponding accompanying drawing below.

As previously mentioned, lining is preferably compressed into cylindrical shell after injecting plunger.Various lockings are selected can be in order to remain on lining in the cylindrical shell.Plunger is remained on the combination in any of the locking mechanism of locking in the lining, can with lining itself is remained on any one coupling of this device in the injector cartridge by them.

Be understandable that a lot of available different devices are arranged, can be used for locking plunger by their linings, and these be contemplated that within the scope of the invention.

Also can be preferably, in the cylindrical shell end of inserting lining, be provided with vertical or outthrust longitudinally, can prevent that thus lining from rotating, particularly using the division lining or needing twisting action plunger is locked under the situation in the lining.

And, preferably, be that plunger self is provided with flange at the end of plunger, directly pass through locking device to prevent that it is pulled.Like this, syringe not only is caused invalid preventing that plunger from being compressed into again, and is caused safety owing to plunger can not Remove All.Therefore, in case plunger is locked in the lining, after it was retracted in the cylindrical shell, self neither may be contracted plunger and lining, otherwise obtained being positioned at the approaching of the intravital pin of tube.

Therefore, effectively, the locking plunger can more preferably improve by the flange that is positioned on the plunger in lining, and flange can preferably be positioned at directly over the piston area of plunger, thereby allows plunger by the bottom locking near lining, prevents from that plunger is whole to be contracted.

As mentioned above, by snap point is set in plunger, it also will prevent or to make further the probability of abuse (tamper) reduce at least minimum, especially prevents as follows near plunger, promptly allows plunger to be forced to get back in the cylindrical shell or by extra power to catch so that it is removed.

Therefore, for example, a kind of twistlock (twist lock) feature of preferred embodiment using, be included in the cylindrical shell of syringe and the respective threads zone on plunger, make after injection, by reversing described plunger with engagement respective threads part, plunger is contracted and locks in place.

As selection, locking device is provided by the twistlock feature, described twistlock feature comprises that the spiral fluted twist lock bush and being positioned at of having that is positioned in the injector cartridge is used for the corresponding lug that meshes at helicla flute on the plunger, make after injection, by reversing plunger so that described lug is engaged in the corresponding helicla flute, plunger is contracted and is locked in suitable position.

Once more, as selection, locking device can be provided by the twistlock feature, described twistlock feature comprises that the spiral fluted twist lock bush and being positioned at of having that is positioned in the injector cartridge is used for the lug that meshes at helicla flute on the plunger, make after injection, move through corresponding helicla flute and pass through lining fully to impel lug by reversing plunger, plunger is contracted and is locked in suitable position.

Therefore preferably, in this embodiment, permanent lock facility is set, returns by the groove of lining, and prevent that plunger from retreating by lining and enter in the cylindrical shell of syringe to prevent lug with inclined-plane or other outthrust form.

But, more can be preferentially selectively, have been found that the locking lining with simple flange arrangement not only produces but also be effective easily.In this layout, the flange around the bush inside allows the respective flanges on the plunger to pass through in a direction, but prevents that by the shape of flange it from returning.Flange other on as described above and the plunger combines, and prevents that plunger is pulled directly by lining, prevents the effective locking of moving in any one direction thereby provide.

Have been found that the flange that replaces around the whole inner periphery of lining, a pair of finger piece works equally effectively.By making the interior zone molding of cylindrical shell, when passing through, allow finger piece crooked backward with flange when plunger, can realize that the motion of finger piece allows first flange of plunger to pass through, in case first flange passes through, rebound rapidly by resilience force.

Though a large amount of describes below with reference to a kind of specific retractable safety syringe with some feature, is understandable that twist lock mechanism can be used with any syringe with any type of retractible pin equipment.

The present invention has found the application in a kind of embodiment widely, for example, it provides a kind of syringe that is included in retractible pin equipment wherein that has, make and be in first memory location before use, pin is encapsulated in the main body of syringe safely, and in second use location, pin is impelled the Subject Extension from syringe, so that serve as useful pin and combinations of syringe in known manner, in case and wherein syringe is used, pin is impelled in the main body that is retracted to syringe once more then, so that it is turned back to first memory location; Syringe comprises main body and plunger, wherein plunger has the intravital device related with plunger end of the master who is included in syringe, be positioned at the protuberance of the pin in the syringe body with engagement releasedly, so that pin is remained in the syringe body of first memory location, and wherein the main body of syringe has and is positioned at and the device of plunger from the opposite end of Subject Extension, be used for releasedly the pin protuberance being remained on second use location, make pin extend from syringe body, plunger is used for making the end engagement of pin protuberance and syringe body; Plunger can discharge from the pin protuberance then, so that make plunger be contracted, and thus fluid is brought in the syringe, and is used for then in known manner this fluid being injected to patient; And when finishing injection, and pin makes engagement of plunger and pin protuberance and withdrawal, so that impel the end release of pin protuberance from syringe body again by when patient withdraws, make pin be retracted to again in the main body of syringe, pin keeps being connected with the end of plunger.

As selection; wherein needle assembly can be like this; make in initial position; pin can extend; can be ready to use; it perhaps can be the pressing device (glandarrangement) that interchangeable pin has been installed; pin is before use by suitable sheath or lid protection in either case; making can be under the situation of the end of injecting; the end of plunger only contacts with needle assembly or gland; engagement between this some realization plunger and assembly or gland makes that described assembly or gland are retracted in the cylindrical shell with pin self when plunger is withdrawn.

Plunger is impelled and the engagement of locking lining then, and can preferably fracture in snap point, to cause syringe safe and invalid to further use.

Therefore the present invention is useful especially because pin not only use after withdrawal safely, and rely on the locking lining to be locked in this position.

The plunger (if be provided with) that fractures also causes syringe invalid for ensuing use, and extra safety is provided, and is exposed once more or is impelled from syringe body and extend because pin can not impel by any device.

Description of drawings

Describe from the preferred implementation of detail description that the present invention may be better understood, wherein:

Fig. 1 is the cross-sectional view of one embodiment of the present invention of use locking lining according to an aspect of the present invention, and wherein kayser division lining is used to keep plunger after use;

Fig. 2 is the cross-sectional view of the plunger that uses in the embodiment of Fig. 1;

Fig. 3 is the cross-sectional view of the cylindrical shell that uses in the embodiment of Fig. 1;

Fig. 4 is the cross-sectional view of end of the cylindrical shell of Fig. 3, and the locking lining can be installed in this end;

Fig. 5 is the cross-sectional view that is used for a kind of preferred implementation of the locking lining that uses with as shown in Figures 1 to 4 syringe and assembly thereof;

Fig. 6 is the plane graph of the locking lining of Fig. 5;

Fig. 7 is the detailed cross-sectional view of the plunger end of Fig. 2, when plunger its meshed and the pin (not shown) of withdrawing after when being contracted, the clip of plunger end engagement Fig. 5 and Fig. 6;

Fig. 8 is after engagement produces, the plunger end in the earlier drawings and the cross-sectional view of clip;

Fig. 9 is to use the cross-sectional view of injector cartridge of the twist lock bush of a kind of alternate embodiments of the present invention described in Fig. 1 to Fig. 8;

Figure 10 is the detailed cross sectional view that is used for the plunger that uses with the twist lock bush of Fig. 9;

Figure 11 a/11b to Figure 15 a/15b has schematically shown according to the paired lining of different alternative embodiments and corresponding plunger; And

Figure 16 and Figure 17 have shown the simplification lining similar with Fig. 6 to Fig. 5 according to another embodiment of the present invention according to two perspective views.

The specific embodiment

Usually referring to figs. 1 to Fig. 8 and especially Fig. 1, shown a kind of syringe according to an aspect of the present invention, usually marked 11, it comprises syringe body or cylindrical shell 12, slidably plunger 13 and pin 14 therein.Pin 14 is equipped with sleeve (hub) 15.For clearer, plunger 13 and cylindrical shell 12 are presented at separately among Fig. 2 and Fig. 3.

Needle sleeve 15 is positioned in the gland 16 by interference engagement, in this embodiment, uses internal female 17 and the pin thread on gland 18 on the inside of cylindrical shell 12 ends, with the end of gland precession cylindrical shell 12.In this embodiment, comprise that the needle assembly of pin 14 and sleeve 15 and gland 16 can be replaced or change (in fact installing) before syringe uses so that for example relatively the specification of pin the selection of motility is provided.

Be understandable that in a kind of alternative, gland 16 can be screwed on the outside of cylindrical shell 12, for example in slimline syringes.These embodiments allow to replace needle assembly in so-called transposing pin (exchangeneedle).On the other hand, pin 14 and sleeve 15 can directly be used in the end of cylindrical shell 12 in entire arrangement, and do not need gland 16, in another embodiment of the invention, do not need to change pin 14.

Little sealer 19 is provided to seal between needle sleeve 15 and gland 16, and simultaneously, the second bigger sealer 20 is provided to seal between gland 16 and cylindrical shell 12.

Pin 14 is before use with covering 21 protections.

Plunger 13 is provided with clamp apparatus 22, and this clamp apparatus 22 is positioned on the bar 23 of plunger 13 ends.Clip has hook 24, and when when injection finishes plunger 13 contact pin sleeves 15, hook 24 meshes with the interior zone 25 of needle sleeve 15.

Plunger 13 is provided with piston area 26 in its underpart on every side, and in the time of in being inserted in syringe body 12, piston area 26 is near the inner sealing of syringe body 12.

Suitable position is provided with snap slot or weak section 27 on plunger 13, makes after it has been retracted to pin 14 in the cylindrical shell 12 of syringe, that is to say, as below after the use described, it can be fractureed.

Locking lining 28 is positioned in the upper area of cylindrical shell 12.

The details of the region of interest of locking lining 28 and the syringe 11 relevant with its use at length shows in Fig. 4 to Fig. 8.

Locking lining 28 has the division zone, and this division zone diagrammatically is presented at 29 places among Fig. 6, is used for easily lining 28 being installed to cylindrical shell 12.Flange 30 is positioned in around it, and a pair of finger piece 31 hangs down from lining 28, is used for and corresponding circumferential groove zone 32 couplings, and circumferential groove zone 32 is positioned between circumferential flange 33 and 34, and circumferential flange 33 and 34 is positioned near the end regions of plunger 13.Flange 33 and finger piece 31 suitably are provided with the inclined-plane so that pass through easily in a side, but have each other effectively parallel surface at opposite side, return so that prevent.

The profile of the interior zone 35 of cylindrical shell 12 ends especially by groove 36 is set, similarly allows the easy installation of lining 28 and remains on wherein, and flange 30 is positioned in the groove 36, is used to mate the engagement with suitable inclined-plane, is required with auxiliary herein and installs.Behind the finger piece 31 of lining 28, recess 37 is set especially, when it is in suitable position (as shown in fig. 1), makes finger piece 31 deformables when the end of plunger 13 is engaged with.

Flange 38 is location around the lining also, strengthening it, and assists when be installed to cylindrical shell 12 and aligns with lining 28.

Especially, by advancing recess 37, the first flanges 33 that finger piece 31 is passed through them, make the finger piece 31 of lining 28 by the same with that zone of plunger 13.Second flange 34 is equipped with the diameter bigger than flange 33, passes through so that prevent finger piece 31, and thus when therefore finger piece 31 meshes in groove 36, locking plunger 13.Plunger 13 can neither further be spurred by lining 28 by flange 34, also can not compressed into once more by flange 33.

Get back to Fig. 1, pin 39 is positioned in the hole 40 of plunger 13 upper areas.Pin 39 serves as the depth stop piece, to prevent using preceding plunger 13 to mesh unexpectedly with needle sleeve 15.When syringe will be used, pin 39 can be compressed into easily, so that allow plunger 13 to advance fully in cylindrical shell 12.

Therefore in use, after finishing injection, plunger 13 is pushed back to mesh with needle sleeve 15.Pin 14 with engagement, plunger 13 is contracted then, therefore pin 14 is retracted back in the cylindrical shell 12, plunger 13 is drawn back then fully, so that utilize flange 33 and 34 and the engagement of locking lining 28, in case thereby finger piece 31 has been engaged in the groove 36 between being positioned at, just can prevent that plunger from moving in any direction.

Plunger 13 fractures in snap point 27 then.Plunger 13 can not use, and pin 14 is retracted in the main body 12 of syringe 11, and it is useless fully that syringe 11 is caused, and can be handled safely then.

Fig. 9 and Figure 10 especially at length show interchangeable embodiment of the present invention, adopt twist lock bush 41 and the form of the corresponding plunger 13 that uses therewith, in Fig. 9 and Figure 10, use identical reference number to mark with the common similar features of Fig. 1 to Fig. 8.This combination for example can be used in any syringe that comprises Fig. 1, wherein need locking mechanism to be positioned at the end of plunger 13 with the pin 14 that keeps withdrawal, and need whereby to fracture it by locking plunger 13 and in snap point 25, and therefore make pin 14 be encapsulated in the cylindrical shell of syringe 11 and make pin 14 be in other can not be approaching state, and cause syringe 11 after use to no avail.

Plunger 13 is provided with lug 42, and it can have any suitable cross-sectional shape.Three kinds of specific cross sections are respectively the circle import of flat limit, thread segment and simple circular 43,44,45 by detailed demonstration.In this embodiment, lug 42 is positioned in the rib (rib) of plunger 13, however the individual features of aforementioned embodiments, and just flange 33, in those embodiments, form (and therefore describing) circumferentially around plunger 13, rather than the extension of the rib element of plunger 13.

Lining 41 can be divided, with foregoing embodiment in equally surround around being centered around plunger 13.Selectively, it can be an entity, and is screwed on the plunger 13 before piston 26 being installed to the there.Lining 41 has two helix internal grooves 46, with when plunger 13 is rotated by lining 41, makes lug 42 feedings.When lug 42 passed through lining 41, they rose on Permanent lock 47, and plunger 13 is locked in the cylindrical shell 12 thus.Along with plunger 13 is locked, piston 26 is transferred, and it is pressed in the cylindrical shell 12.When piston reduces the degree of depth, its diameter expansion.As shown in the figure, twist lock bush 41 is maintained in the groove 48 in the cylindrical shell 13.

Figure 11 to 15 has shown various devices, can be used with corresponding plunger 13 by these device locking linings 41.For convenience, the feature of having described is used identical reference number.

Figure 11 a, 11b have shown 13 combinations of locking lining 41/ plunger, and wherein lining 41 has two helicla flutes 46 usually.When plunger 13 is contracted, two lugs, the 42 meshing spiral grooves 46 on plunger 13, thus when reversing, it locks plunger 13.When lug 42 climbs out of lining 41 tops, lock, be positioned at the substrate 50 that flange 49 on the piston 26 is locked in twist lock bush 41 simultaneously, prevent plunger 13 moving up or down.

Figure 12 a, 12b have shown have screw thread 51 lining 41 of (it can be any screw thread).When plunger 13 be contracted and screw thread 51 and plunger 13 on during respective threads 52 engagements, during shoulder (shoulder) in arriving lining 41 53, stop the rotation.Simultaneously, the flange 49 on the piston 26 is locked on the bottom 50 of screw-thread bush 41.

In Figure 13 a, 13b, the lining 41 of zip lining has been described.As shown in the figure, this lining 41 has two grooves 54 on lining 41 inside.When plunger 13 is contracted by groove 54 and is reversed, lock lug 42 on the plunger 13 and 54 couplings of the interior groove in the lining 41.Therefore lug 42 is allowed to be placed in the lower horizontal groove 55 with bayonet socket mounting means (bayonet fitting fashion).Simultaneously, the flange 49 on the piston 26 is locked on the bottom 50 of zip lining 41 once more.

In Figure 14 a, 14b, shown snap-lock bush 41, its inside has locking tapered finger 56 and step 57.When plunger 13 was contracted by the kayser tapered flanges 58 on the plunger 13, kayser tapered flanges 58 meshed the taper lock finger by taper lock finger 56 is launched to allow plunger 13 to pass through.Tapered finger 56 is rebounded around plunger taper 58 and two steps, and a step 59 is on plunger 13, and another step 57 is at the top of the finger piece 56 of lining 41 inside, and locking makes plunger 13 not to be pushed down thus.

Figure 15 a, 15b have shown the plunger 13 with two grooves (flute) 60 similar to needle sleeve, the road strategic point lock design 61 of its engagement lining 41 inside.When plunger 13 rotated, plunger 13 was upwards advanced, locking between the bottom 50 of flange on the piston 26 49 and lining 41.

In each aforementioned case, plunger 13 is fractureed at snap point 27 places, prevents any uncommitted or reuse syringe 11 unexpectedly thus.

Be presented at the simple version of the snap-lock bush that shows among Figure 14 a, the 14b in Figure 16 and 17, wherein finger piece 51 can be less to two.Though do not show, lining 41 also can be easy to install allowing by division, makes the end of plunger 13 at first be advanced the cylindrical shell 12 of syringe 11.But when being ready to use before use, lining 41 can be placed between the installation period of syringe around the plunger 13 then, and is pushed into suitable position before plunger 13 is laid in its original position.

It will be appreciated by persons skilled in the art that and to make many modifications and variations to embodiment described herein, and do not depart from the spirit or scope of the present invention.

Run through whole description, word " comprises " and its derivative means to have and included rather than the exclusive meaning, unless require other meaning in the context.

The present invention disclosed herein has versatility, because the present invention provides interchangeable device for the safety injector with retractable needles equipment, it is after injection, and by locking plunger and fractureing it, it is invalid to be caused.

Claims (28)

1. safety injector, it has the retractible pin equipment that is included in wherein, described syringe comprises cylindrical shell and plunger and needle assembly, wherein in a single day described pin is used when finishing injection, described pin just is retracted in the described cylindrical shell of described syringe by means of the engagement between described needle assembly and the described plunger end, and wherein in described syringe body, be provided with locking device, mesh described plunger during with withdrawal after syringe uses, make to cause described syringe not to be used further.

2. safety injector as claimed in claim 1, wherein said syringe can not further use, described pin recover to use because described plunger can not be pushed away downwards once more, can not be Removed All to obtain approaching to described pin from the described cylindrical shell of described syringe.

3. as claim 1 or the described safety injector of claim 2, wherein, in described plunger, be provided with weak section, described weak section is positioned on the axle of described plunger, be in when described plunger is contracted fully near the end extended spot of described syringe body, make to be retracted in the main body of described syringe, and after described plunger and the engagement of described locking device, described plunger can be fractureed so that described syringe can not be used again at described pin.

4. the described safety injector of each claim as described above, wherein, described locking device is provided by a lining, and described lining is positioned at the described plunger of described injector cartridge from the end of its extension.

5. safety injector as claimed in claim 4, wherein said lining are the entity linings.

6. safety injector as claimed in claim 4, wherein said lining are the division linings.

7. safety injector as claimed in claim 6, wherein said lining is to install after described plunger is inserted in the described cylindrical shell and is pressed into appropriate position in the described cylindrical shell, wherein said division is made into around the described axle of described plunger and installs, and be made into and when so being compressed into described cylindrical shell, reduce diameter, and be engaged to by being clasped in the interior zone of described cylindrical shell.

8. as each described safety injector in the claim 4 to 7, wherein said lining is compressed into described cylindrical shell after inserting described plunger.

9. as each described safety injector in the claim 4 to 8, wherein described plunger is remained on the device coupling in the described cylindrical shell that described lining self is remained on described syringe of the locking mechanism of any appropriate in the described locking lining and any appropriate.

10. as each described safety injector in the claim 4 to 9, wherein in the end of the described cylindrical shell that inserts described lining, be provided with vertical or outthrust longitudinally, prevent that thus described lining from rotating.

11. as each described safety injector in the claim 4 to 10, wherein near the far-end of described plunger, be provided with flange, to prevent that described plunger from directly being pulled out by described locking device for described plunger.

12. safety injector as claimed in claim 11, wherein said plunger can be prevented that described plunger from being withdrawn fully by the bottom locking near described lining.

13. as each described safety injector in the claim 4 to 12, wherein said lining utilize reversing of described plunger or spur by or enter described lining.

14. safety injector as claimed in claim 13, wherein said lining is a twist lock bush, and provides described by screw-thread bush or road strategic point lock lining and reverse.

15. as claim 13 or the described safety injector of claim 14, wherein said syringe uses the twistlock feature, be included in the described cylindrical shell of described syringe and the respective threads zone on described plunger, make after injection, by reversing described plunger with engagement respective threads part, described plunger is contracted and locks in place.

16. as claim 13 or the described safety injector of claim 14, wherein said syringe uses locking device, adopt the form of twistlock feature, described twistlock feature comprises that the spiral fluted twist lock bush and being positioned at of having in the described cylindrical shell that is positioned at described syringe is used for the corresponding lug that meshes at described helicla flute on the described plunger, make after injection, by reversing described plunger so that described lug is engaged in the corresponding helicla flute, described plunger is contracted and is locked in suitable position.

17. as claim 13 or the described safety injector of claim 14, wherein said locking device is provided by the twistlock feature, described twistlock feature comprises that the spiral fluted twist lock bush and being positioned at of having in the described cylindrical shell that is positioned at described syringe is used for the lug that meshes at described helicla flute on the described plunger, make after injection, move through corresponding helicla flute and pass through described lining fully to impel described lug by reversing described plunger, described plunger is contracted and is locked in suitable position.

18. as claim 13 or the described safety injector of claim 14, wherein said locking device provides by having two spiral fluted linings, when described plunger is contracted, two lugs of described helicla flute and the described spiral fluted of the engagement on the described plunger cooperate, thereby are reversed along with plunger and lock described plunger 13.

19. as claim 13 or the described safety injector of claim 14, wherein said locking device adopts has the lining form of screw thread, and wherein be contracted along with described plunger and described screw thread and described plunger on respective threads engagement, rotation will stop when the shoulder in the described lining of arrival, and the flange on the piston is locked in the bottom of screw-thread bush simultaneously.

20. as each described safety injector in the claim 4 to 12, wherein said lining is zip lining or snap-lock bush.

21. safety injector as claimed in claim 20, wherein said locking device has the permanent lock facility that is provided with inclined-plane or other outthrust form, preventing that described lug from returning by the described groove of described lining, and therefore prevent that described plunger from retreating in the described cylindrical shell that enters described syringe by described lining.

22. safety injector as claimed in claim 21, wherein be positioned with a flange around near the inner periphery of described lining, allow respective flanges on the described plunger to pass through in a direction, but the shape by described flange prevents that described plunger from returning, and wherein combine with additional flange on the described plunger as mentioned above, it is direct by described lining to prevent that described plunger is pulled, thus the effective locking that provides prevention to move in any one direction.

23. safety injector as claimed in claim 21, the first flange co-operating of wherein a pair of finger piece and described plunger, the shape of arranging by the inclined-plane of described flange allows it to pass through, and when the described flange of described plunger passes through, the shape of the interior zone by described cylindrical shell allows described finger piece crooked backward, in case described first flange passes through, and rebounds rapidly by resilience force.

24. safety injector as claimed in claim 20, wherein said locking lining is a snap-lock bush, inside has locking taper and step therein, make when described plunger is contracted by the kayser tapered flanges, it is by launching the taper lock finger to allow described plunger by meshing described taper lock finger, and wherein tapered finger is rebounded near plunger taper and two steps, a step is on described plunger, and the top of another described finger piece in described lining, therefore locking makes described plunger not to be pushed downwards.

25. safety injector, it has the retractible pin equipment that is included in wherein, be in first memory location before feasible the use, described pin is encapsulated in the main body of described syringe safely, and in second use location, described pin is impelled the Subject Extension from described syringe, so that in known manner as useful pin and combinations of syringe, and wherein, in case it is used, described pin is impelled in the main body that is retracted to described syringe once more then, so that it is turned back to described first memory location; Described syringe comprises main body and plunger, wherein said plunger has the related device of the intravital and described plunger end of the described master who is included in described syringe, be positioned at the protuberance of the described pin in the described syringe body with engagement releasedly, so that described pin is remained in the described syringe body in described first memory location, and the described main body of wherein said syringe has and is positioned at and the device of described plunger from its opposite end of described Subject Extension part, be used for releasedly described pin protuberance being remained on described second use location, make described pin extend from described syringe body, described plunger is used for making the end engagement of described pin protuberance and described syringe body; Described plunger can break away from engagement with described pin protuberance then, so that make described plunger be contracted, and thus fluid is brought in the described syringe, and is used for then in known manner same fluid being injected to patient; And when finishing injection, and described pin is by when patient withdraws, described plunger meshes and withdrawal with described pin protuberance again, so that impel the end release of described pin protuberance from described syringe body, make described pin be retracted to again in the described main body of described syringe, described pin keeps being connected with the end of described plunger.

26. safety injector as claimed in claim 25; wherein said needle assembly is configured such that in initial position; described pin extends; be ready for use; it maybe can be the pressing device that interchangeable pin has been installed; before use; described pin in either case is by suitable sheath or lid protection; making can be under the situation that injection finishes; the end of described plunger only contacts with described needle assembly or gland; engagement between this point described plunger of realization and described assembly or gland makes that described assembly or gland self are retracted in the described cylindrical shell with described pin by the withdrawal of described plunger.

27. as claim 25 or the described safety injector of claim 26, wherein said plunger is impelled and described locking lining engagement then, and preferably fractures in snap point, to cause described syringe safe and invalid for further use.

28. safety injector, has locking device, this locking device is used for the plunger of the described syringe of locking after use, preventing the further use of described syringe, its in fact as here with every width of cloth figure of Figure 11 to Figure 15 of Fig. 9 of Fig. 1 to Fig. 8 of accompanying drawing, accompanying drawing and Figure 10 or accompanying drawing combine be disclosed the same.

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