CN101516424A

CN101516424A - A single use syringe

Info

Publication number: CN101516424A
Application number: CNA200780034572XA
Authority: CN
Inventors: B·L·基恩
Original assignee: Occupational and Medical Innovations Pty Ltd
Current assignee: Occupational and Medical Innovations Pty Ltd
Priority date: 2006-07-20
Filing date: 2007-07-20
Publication date: 2009-08-26

Abstract

A no leak single use syringe has a needle (26) which retracts into the plunger (15) after use, and when the needle (26) is retracted, the syringe is sealed to prevent any liquid still on or in the needle from leaking from the syringe. A pierceable seal (17) across the front of the plunger (15) is self-sealing to prevent any liquid leaking from the front of the syringe, and the distal end (67) of the plunger seals against the rear of the barrel (71) of the syringe to prevent leakage from the rear.

Description

Disposable syringe

Technical field

The present invention relates to the medical safe syringe, be usually directed to a kind of like this syringe, it has retroeflection (shoot back) type syringe needle indentation mechanism, and have particular design after the syringe needle indentation, to form annular seal space, make syringe become " do not have leak " syringe thus and make syringe can be used to dangerous drug (for example nuclear pharmaceuticals) or other dangerous substance.The invention still further relates to several improvement, thereby for example be drawn out of, minimum is reduced in the dead band in the syringe and the correct use of a plurality of visual detectors with the expression syringe is provided to prevent plunger by adopting multiple locking member to improve safety to the design of disposable syringe.

Background technology

At medical domain, acupuncture is a kind of special occupational risk, therefore makes the danger that many devices reduce acupuncture always.Acupuncture from syringe needle is a kind of special danger to the healthcare givers.Guarantee that it also is favourable that injector for medical purpose does not reuse.Can prevent from like this to pollute.For this reason, there are many syringes to have mechanism or the device that syringe is restricted to disposable syringe.

A kind of known mechanism develops " retroeflection " mechanism by applicant of the present invention, and it is the pro-subject matter of an invention.This mechanism is included in the syringe needle keeper that injector syringe is anterior and link to each other with syringe needle.Spring places around the syringe needle keeper under compressive state.The syringe needle keeper remains on the forward appropriate location of syringe under the extruding of spring.When plunger is pushed through injector syringe and shift to the syringe front portion, plunger front moves or by alternate manner the part of the retracting spring compression of syringe needle keeper is activated, and impels the remainder of syringe needle keeper and syringe needle retroeflection to arrive in the home of plunger body.In this particular design, the syringe needle keeper has certain thickness, therefore plunger activated retroeflection mechanism before plunger can advance to the syringe forefront.

Exist multiple other mechanism to make the syringe needle withdrawal.These mechanisms comprise dissimilar spring structures, the design of dissimilar syringe needle keeper, dissimilar plunger design, spring, the plunger of " elongation " is locked on the syringe needle keeper and the indentation of plunger makes design of syringe needle keeper indentation or the like when plunger moves forward.

Sometimes must injection of radioactive substances (nuclear pharmaceuticals) or make syringe that the hazardous material of other type is housed.What must very note is that hazardous material can not contact with the healthcare givers.Therefore, advantageously but the design of syringe with indentation syringe needle and indentation structure Design and syringe makes when syringe needle indentation (being reduced to usually in the hollow posts cock body), syringe positively obtains sealing, thereby any residual active material or dangerous retained material can not spill from syringe on the syringe needle.

Have been found that many syringe needle indentations mechanism leaves sizable opening when syringe needle is in retracted position, this means that any hazardous material of still staying in the syringe needle can spill from syringe.For example, a kind of indentation mechanism of type known has breaking disc or the displaceable element that hollow plunger and plunger front portion comprise some form, and when the syringe needle indentation, syringe needle makes breaking disc broken or displaceable element pushed back.Even now is retracted in the hollow posts cock body with making needle safety, but it causes plunger front to keep open fully, this means that hazardous material might leak, enter in the syringe and spill from the syringe front end (position at syringe needle place) of opening this moment from plunger.

On the contrary, in the design of the indentation mechanism in our early stage patent (the especially forward design of plunger), after being retracted in the plunger body, syringe needle can not reserve very big opening in the plunger front portion.Particularly, our plunger front portion comprises relatively thin potted component, and when triggering syringe needle indentation mechanism, the syringe needle meeting " is pierced through " potted component and entered in the piston body.Potted component is made by elastomeric material and is " self-healing ", this means after syringe needle has been retracted in the plunger body, because the attribute of recovery certainly of plunger seal, plunger front still obtains sealing.Therefore, still be retained in the syringe needle or on any potential dangerous liquid can not pass that plunger is anterior to be leaked.The syringe needle keeper is by being " locked " at plunger cavity rear portion with engaging of the little latch that is positioned at the plunger body rear portion when syringe needle and syringe needle keeper are retracted in the plunger cavity, and described latch forms by form little opening on the wall of plunger body.Thereby potential hazardous material still may pass these little openings and leak.

The present invention relates to improvement to our early stage injector designed, even be not impossible especially at present, also be very difficulty for residual liquid when the syringe needle indentation from the syringe front portion or the improvement (a plurality of improvement) of leaking of syringe rear portion.The fixed form of this and syringe is irrelevant.Thereby, the present invention relates to a kind of injector designed, even being held in modes such as vertical, angled, levels, this design syringe can prevent after syringe needle indentation that also syringe from leaking.The design feature that prevents plunger indentation after syringe needle indentation mechanism has obtained triggering is provided also advantageously.

Believe the syringe needle that on market, does not have other disposable syringe can be used to nuclear pharmaceuticals and have automatic indentation, and when syringe needle indentation, syringe complete closed and processing safety.

The invention still further relates to multiple other security feature, plunger locking piece (for example an example is referring to Figure 13-16, and another example is referring to Figure 17-23) for example, the dead band reduces parts (for example referring to Fig. 5 A-5C), and visual detector (for example referring to Fig. 6-8).

Will be clear that to be appreciated that if in this reference publication of the prior art, then this reference is not to admit that disclosed content has constituted the common practise of this area in Australia or any other country.

Summary of the invention

The purpose of this invention is to provide can overcome in the above-mentioned defective at least some syringe or similar device or provide effectively or have the selection of commercial value.

In one form, the present invention relates to a kind of syringe, it comprises:

Syringe body with anterior and open rear end portion,

Plunger, it has front and rear and can slide into the extended position that plunger has moved to the syringe body front portion along syringe body along the retracted position that syringe body is in from the plunger front portion the syringe body rear portion,

Anterior the piercing through from recovering sealing member of extending of plunger, when the syringe needle indentation, syringe needle can penetrate described piercing through from recovering sealing member, and the sealing part is closed after syringe needle passes sealing member basically,

Be positioned at the forward syringe needle keeper of syringe body,

Be connected to the syringe needle of syringe needle keeper,

Make syringe needle can be retracted into syringe body and/or the intravital trigger mechanism of plunger,

The locking plunger is in case the plunger locking mechanism of its indentation when syringe needle indentation,

Be positioned at the thumb pad at plunger rear portion, and

Sealing member on thumb pad, its open rear end portion that seals up syringe body when syringe needle indentation leaks from the rearward end of syringe body to prevent liquid.

Fig. 9-12 expression is from the sealing member that recovers on sealing member, plunger locking mechanism, thumb pad and the thumb pad.

The syringe needle keeper can be included in the one or more middle design of describing in our the early stage patent application, but the design that also can be included in other patent application or in other commercial product or publication, describe.Usually, the syringe needle keeper comprises the part that can hold syringe needle, and this part normally core or the inside of syringe needle keeper.The part of syringe needle keeper or syringe needle keeper remains on the anterior of syringe body and can be by " triggering " or controlled to impel the syringe needle indentation by alternate manner in dismountable mode usually.In our early stage patent application, the syringe needle keeper remains on the front portion of syringe body by step or like.In other design, the syringe needle keeper remains on (comprising friction member, driffractive ring etc.) front portion of syringe body by other device.

The part of syringe needle keeper usually by spring or like bias voltage with retroeflection in plunger body/syringe body, but This move is prevented from by being held in a certain mode, this can comprise that frangible portion is set grades.

When plunger had been pushed to fully forward position, the part by the plunger that contacts with a part of syringe needle keeper caused the part (comprising syringe needle) of release needle keeper so that the trigger action of its indentation usually.

In our some early stage patent applications and in other publication, described these indentation mechanisms.

The syringe needle keeper can be connected the inside and the front area of syringe body.Can spring be set in the front portion of syringe body, but it is biasedly injected the part of syringe needle keeper in the plunger with the puncture through seal part that passes on the plunger front surface.Syringe needle can have inside and outside, and inside holds syringe needle, and outside and the wall of vertical passage engage and be at first the rear portion of passage, also comprise the frangible part between inside and the outside.The outside can comprise the ledge (can be called as " protuberance ") that points to plunger seal, ledge only extends around interior section ground, ledge plays to plunger provides effect with the outside initial contact area of syringe needle keeper, reduces to make frangible partial rupture to trigger the required power of retroeflection mechanism thus.

Ledge (protuberance) can comprise the topmost that is suitable for contact plunger and near the shoulder of topmost, shoulder plays the effect that reduces the dead band between stopper head and the syringe needle indentation mechanism.Shoulder can be called as " chamfering ".Shoulder can play fills other dead space volume and reduces thus otherwise be present in the effect of the dead volume between stopper head and the retroeflection mechanism.Can expect that shoulder is near each side of topmost and it will also be appreciated that shoulder and topmost is included in " ledge " of the one on the outside.Shoulder can comprise " chamfering " that extends downwardly into outer surface from topmost.Shoulder can have level and smooth relatively inclination, perhaps can have irregularly shaped or any other shape or structure, can influence the power retroeflection mechanism that retroeflection mechanism, especially power of influence reduce simultaneously as long as can reduce the dead band with meeting the requirements.

Plunger can front end have conventional straight front surface and can be equipped with can pierce through Zi recover sealing member with reduce with retroeflection in plunger body and any interference of passing or taking place through the syringe needle keeper of sealing member.Thereby, need not the retainer or the latch of relatively large volume are assemblied in the plunger front portion.Also need not to comprise facet in the plunger front portion.

Trigger mechanism can adopt and promote and explosive movement, wherein the outside of syringe needle keeper by plunger longitudinally passage promote forward, innerly simultaneously keep static, this motion makes inside is remained on frangible partial rupture on the outside.It is favourable that this trigger action with cutting action or any other type is compared.Yet, main advantage is to make frangible partial rupture and triggers the required power of retroeflection mechanism thus because of the design of outside and especially reduced because of the setting of ledge (protuberance), and described ledge is anterior and provide initial contact point between plunger and outside in the face of plunger.Described design also can reduce the dead band, but and the design that has ledge forward with plunger and be difficult to comprise the puncture through seal part compare and make plunger that but the puncture through seal part can be housed.

Preferably be included in the core that extends on the other hollow front of plunger at the sealing member that extends on the plunger front surface, and the marginal portion of on the plunger edge, extending.Core is for example by making wall thickness be designed to more for a short time be pierced or break easilier.The marginal portion can comprise thicker sealing member zone and should can obtain compression or extruding in the zone when contacting with the ledge of outside.The advantage of this point is that the plunger front portion can be pushed very near syringe needle keeper (reducing the dead band thus) before power is enough to trigger retroeflection mechanism.

Syringe can have any suitable shape and size.Can expect that syringe changes between 50 mils even bigger syringe at 1 mil syringe.Syringe can be made by any suitable material, for example plastics, glass even metal.Preferably syringe is made of plastics.

Syringe has syringe body.Main body has the cylindrical of routine usually in design, and however, if desired, main body can have other shape, for example rectangular cross section, oval cross section or the like.The length of syringe body can be according to the change in size of syringe and usually at the 30-200 millimeter, and however, this size can change.The diameter of syringe body also can change and usually at the 5-20 millimeter, however, this size can change.Syringe body has the wall thickness of 0.3-4mm usually, and however, this size can change.Syringe body can have to grasp and strengthens feature or the location strengthens feature, for example outward extending lug or flange, external rib or the like.

Syringe body can have the front portion that puncture needle therefrom stretches out.The front portion has the open front that syringe needle can extend through usually.The front portion comprises vertical passage, its be designed such that usually plunger can along or at least in part along this passage process, and passage constitutes the part of the retroeflection mechanism hereinafter will describe in more detail.Usually passage has more the front portion towards the open front that extends through for syringe needle, and the rear portion.The size and dimension of this passage can change, but can expect that this passage comprises the continuity of the endoporus of syringe body.Prepass can have the length of 5-30mm according to the size of syringe.

Syringe has plunger.The length of plunger changes according to the size of syringe and plunger has the length of 30-200mm usually, and however, this size can change.Plunger is designed to slide in syringe body, so plunger has and makes its diameter that can move like this or cross section.Plunger is basically or complete hollow usually, makes that the syringe needle that pollutes can be by retroeflection to plunger hollow inside.Yet, also can make the anterior hollow of plunger (being enough to keep at least in part syringe needle) and make the rear portion to be solid or to have different designs.It will also be appreciated that plunger need not to hollow and can comprise X type cross section, or other cross section, make the syringe needle that pollutes can enter in the passage that between syringe cross section and inwall, limits.Can expect that other structure with plunger is by providing the space to hold the syringe needle of pollution after triggering retroeflection mechanism between plunger inside or plunger and the syringe body.Yet plunger comprises that the hollow cylindrical element is considered to favourable.

Plunger has the front end that is formed with front surface, and it is that plunger extends in the syringe body and is pushed to the forward part of syringe.If plunger is cylindrical, then front surface also is essentially cylindrical.

On the plunger front surface, sealing member is set.The sealing part can be pierced, and the feasible syringe needle that pollutes when retroeflection mechanism is triggered can pass or pass through it.Polytype sealing member be can expect, rubber seal, plastic seal, Santoprene comprised ^TMSealing member, elastic sealing element, stacked sealing member or the like.Sealing member extends on the plunger front surface usually fully, and however, according to the size of syringe needle and needle main body, sealing member can only pass through on plunger core or other parts.But being preferably sealing member extends on the plunger front fully.If desired, sealing member can have on the plunger core and to extend and can have different designs (thinner usually) so that its core that can be pierced easilier, and in extension of plunger edge and the thicker and easier marginal portion that is compressed or pushes, reason will be described hereinafter in more detail.Sealing member can also extend good sealing effectiveness to be provided and also to help to make plunger and syringe body inner wall sealing in the side of plunger.Alternatively, the sealing member that extends on the plunger front surface can with on the plunger sidewall, extend and effect is to prevent that liquid is different and separate at the mobile sealing member in plunger seal back.

The sealing member that extends on the plunger front surface be designed to syringe needle after the puncture through seal part from recovering or self-enclosed.Exist the product of multiple elasticity and other type can provide this from recovering attribute.Thereby sealing member is pierced so that the part of syringe needle and syringe needle keeper and part or all of spring are passed sealing member, and sealing member sealing (recovery) after this is to prevent the liquid process sealing member of any potential danger.

Syringe comprises the syringe needle keeper that is used to keep syringe needle.The syringe needle keeper is connected the inside and the front area of syringe body usually.The syringe needle keeper can comprise by the frangible portion branch interconnect inside and outside.Thereby not preferred is inside and outside frictional engagement; Alternately be, inside and outside by frangible part in conjunction with or link together.More reliable action is provided like this and may have reduced to minimum what the accident of syringe needle keeper discharged.

Inside can comprise front and rear and intermediate host part.The anterior opening that can extend through on the syringe body front portion.The intermediate host part can comprise elongated columniform basically part, and it comprises the inner passage that is communicated with puncture needle.The rear portion can be extended and comprises profile or have projection or have any other structure to help piercing through or breaking of plunger seal to plunger.Usually, the rear portion has " arrow " type part or structure.

Can be provided with spring with syringe needle keeper bias voltage to indentation or retro-reflective position.Spring can comprise that the intermediate host that helical spring and helical spring can cast-over head keepers partly extends.

The outside of syringe needle keeper can comprise the part that the syringe needle keeper is remained on the appropriate location on the syringe body front portion and overcome the spring bias voltage.The outside can comprise ring-type element.Ring-type element can have the outer surface that engages with the inwall of syringe body.Joint can comprise frictional engagement, but can also comprise the part of outer surface and shoulder, groove or other structure adjacency of syringe body.

The outside of syringe needle keeper is usually located on the rear portion that is arranged in the syringe body front portion of passage.Thereby the outside can be pushed to the passage front portion along passage from channel rear portion usually.This distance can be according to the size of syringe from 1mm to 20mm.The outside will be impelled frangible partial rupture in this mode with respect to moving of inside, discharge inside thus from the outside and trigger retroeflection mechanism.

Plunger is pushed the front portion of syringe to and is impelled plunger and external engagement and outside along the passage promotion, makes frangible partial rupture thus and triggers retroeflection mechanism.

At least one interior ledge/district/zone of syringe body is just inwardly pointed in the outside sensing plunger front portion that comprises usually.Protuberance grades can be integrally formed with the outside or can independently form and be connected thereon, or form relatively.Ledge can comprise protuberance, rib, tooth, " button " or realize the structure of any other type of described purpose.Preferably ledge only partly partly extends around the inside of syringe around the outside or only.Described structure is designed to usually when plunger is pushed forward, and plunger at first contacted ledge before externally remainder contacts with plunger.Several advantages are provided like this, have comprised reducing to trigger the required power of retroeflection mechanism.For example, this structure can concentrate on the starting force of plunger on the smaller area territory (usually on the outside of syringe needle keeper) and move forward to impel this part, makes the frangible partial rupture on this zone.Have been found that in case frangible part is broken at least in part, then need power seldom to be staggered fully in outside and inside.

Preferably the marginal portion of the sealing member on the plunger is thickened and preferably this part is compressible relatively.Its reason is that the marginal portion is the point that at first contacts with the ledge of outside, and when this contact took place, the marginal portion obtained compression before frangible partial rupture.This compression can more closely be pushed against on the syringe needle keeper plunger front portion, reduces the dead band thus before triggering retroeflection mechanism.

Retroeflection mechanism is similar with the retroeflection mechanism of describing in this we early stage PCT application PCT/AU01/00183 by the cross reference introducing.

If desired, syringe can have position indicator, so that the healthcare givers can more clearly determine " state " of syringe.

An example of these structures has been shown in Fig. 6-8.

Specify, a shortcoming with conventional needles indentation syringe is to be difficult to sometimes be clear that " state " of syringe.One " state " of syringe is that plunger has been retracted (indentation) and medicine fully and is imported in the injector syringe.Usually, this state is fully retracted and injector syringe is observed quite easily when being generally that see through or transparent at plunger, and (common) black plunger seal is clearly visible at the syringe rear portion.

When plunger was pushed forward, medicine passed syringe needle and is penetrated, and plunger moves to " triggering " or indentation mechanism.Sometimes, it is favourable plunger just slowly being moved before triggering.Yet unless plunger is pushed against on the trigger mechanism fully, otherwise medicine can not exclusively be injected in patient's body (just some medicines are still stayed in the syringe) and trigger mechanism can not work.

For less syringe (for example 5 mil syringes even littler), when plunger when the trigger mechanism, often quite be difficult to see plunger position.Certain operations personnel are pushed against plunger on the trigger mechanism very fast, thereby impel the trigger mechanism fast actuating, can produce dangerous like this to patient (or operator).Other the time, operator may take a long time plunger slowly is pushed against on the trigger mechanism, so also can produce danger and misery to the patient.

Therefore, advantageously make figurate device of instrument used for injection or mechanism clearly to indicate " state " of syringe.

Another defective for some safety injectors is that the moment when syringe " has been in a safe condition " is not clear fully.Specify, some trigger mechanisms need plunger to be pushed over the initial trigger position.Also exist some safety injectors that plunger is locked in fully forward position, make plunger can not be drawn out syringe at an easy rate.Making the plunger locking or making the plunger position of syringe safe by alternate manner is not to be operated personnel very easily to observe.Thereby operator can apply too big power on plunger, or the power deficiency that applies.Therefore, if syringe with following advantage or other medical treatment device can be provided then be favourable, promptly figurate device of tool or mechanism " are in a safe condition " in syringe body clearly to indicate plunger.

These syringes can have and are in or near first visual detector of trigger position, and second visual detector that is positioned at the first visual detector front, syringe is clearly visible at least in part between first visual detector and second visual detector, make and when plunger is pushed into that position, can observe plunger seal betwixt, described structure and structure be when plunger seal when first visual detector, there is visual indication, show that trigger action is about to begin, when passing syringe and can between first visual detector and second visual detector, observe plunger seal, plunger be in can't indentation latched position.

Like this, operator can be very easy to see when plunger is about to trigger indentation mechanism, and this is that the whole medicines in syringe have been injected into the intravital position of patient usually.Plunger further moves forward plunger seal (be generally black, be easy to thus see) is positioned between first and second visual detector, and when plunger is in this position, and the locked and syringe of plunger " is in a safe condition ".Thereby operator need not to do any more thing, observe plunger seal then and be between the visual detector determining that plunger obtains locking at this moment, and operator need not " monkeying " syringe and obtain locking to determine plunger.Simultaneously, when also the fluid in syringe had been discharged from thus when trigger mechanism is about to operate, operator can be very easy to see.

Can contemplate polytype visual detector.In simple form, described or each visual detector can comprise the colour band that extends around injector syringe.Colour band can be positioned at syringe inside or syringe outside, or the part of needle cylinder wall.Colour band can comprise coating, coating, printing ink or similar substance, can glued joint or apply or be connected independent thin layered element on syringe etc. by alternate manner.Needn't consider and make any specific limited to the type of colour band.

Band can have any suitable contrast color and can comprise black, blueness, redness, green etc.Each visual detector can comprise different colours.Each visual detector can have combined colors.Described band can comprise fluorescent material or luminescent material.The width of each visual detector can change, and this especially depends on the size of syringe.Can contemplate for small syringe (1-3 mil usually), the width of visual detector can be at 1-3mm.This size can suitably change.

Preferably first and second visual detectors separate very significantly, make clearly to observe plunger seal between indicator.Interval between first and second visual detector can especially change according to syringe size, but can contemplate for small syringe, can be 2-8mm at interval.Certainly this size can appropriate change.

The type of type, trigger mechanism of type, the syringe of syringe needle keeper and the type of the plunger locking mechanism that adopted are depended in the location of first and second indicators.One of indicator should be located such that when plunger seal and be in or when the indicator, its indication trigger mechanism is about to activate and/or content of syringe is discharged fully.Another indicator should be located such that when plunger is locked can't indentation the time, sealing member is positioned between the visual detector.

Can contemplate syringe be configured to have can the identification trigger point at least one indicator and accurate location that can the identification plunger with a device for identifying of engage pistons locking mechanism.Can contemplate single indicator is set.For example, when plunger seal arrived a side of single indicator, this can be the trigger point, and when plunger seal is in the opposite side of single indicator, can confirm that plunger is locked.

Although can contemplate the band (advantageously no matter how syringe is held, and indicator can play a role) that indicator comprises that the cast-over tube extends, there is the only cast-over tube situation of extending partly of indicator.Can also contemplate indicator and can comprise a series of spaced apart indicators, they can with continuous band relatively the cast-over tube extend.Can also contemplate indicator can have any other suitable shape (and need not be the band shape).

Indicator also can comprise the labelling relative with colour band.For example, indicator can comprise that arrow or similar labelling are with at plunger seal indication trigger point or plunger keyed end during near arrow.These indicators can have other shape.

Plunger seal is used as the identification parts near the visual detector location time although be considered advantageously, can contemplate to have the situation that adopts the plunger other parts.For example, plunger can comprise band or the above-mentioned visual detector with contrast color, and it can be arranged on a certain position on the plunger body.The identification parts of corresponding band or other type can be arranged in the key position on the plunger body and can indicate plunger to obtain locking or trigger mechanism near the location and be about to activate etc.

Visual detector can obtain coding (color coding) to make difference between the syringe needle of different size (specification).A kind of color can be used for the syringe needle of 22 specifications and syringe needle that another color is used for 23 specifications etc.

The plunger locking piece

Syringe has plunger locking mechanism to prevent plunger retraction when syringe needle is triggered to retracted position.

Figure 12 illustrates the example of locking piece.

Another example has been shown in Figure 13-16.

Other example has been shown in Figure 17-23.

This is that plunger is pushed to the position that will be resisted against on the syringe needle front portion.Plunger locking mechanism can comprise that projection for example locks the collar, and it engages with certain part of syringe body from the plunger body extension and when plunger is in forward facing position, prevents plunger retraction thus.Projection can be near the location, rear portion of plunger body.If desired, a plurality of projections can be set, however, with due regard to be the collar or the like that projection comprises circumferential extension.In specific implementations of the present invention, the collar is represented by Reference numeral 72 in Figure 12.The collar 72 can comprise tapered edge (referring to Figure 12).The effect of tapered edge is " bonding part " that makes projection can at first push away syringe body, makes plunger can be pulled to the front portion of syringe body, but can not continue indentation.

The bonding part of syringe body can comprise abutment or shoulder or the like that extends internally.Figure 12 illustrates the example.With due regard to be that the bonding part comprises the circumference abutment, however, exist the bonding part can comprise the situation of the abutment of discontinuous abutment or several other types.Described structure is suitably designed, make plunger can at first be pulled to the front portion of syringe body (to discharge medicine), and when plunger during more to syringe body anterior mobile, in a certain stage, the collar on the plunger will be in the bonding part of syringe body below by, there is slightly deformed so that described by action generation (tapered edge on the collar is convenient to This move), in case but after plunger further moves forward, then abut against on the bonding part of syringe body and prevent that plunger from continuing indentation by the collar.

Syringe has thumb pad usually.Thumb pad can have difformity and structure and outside or other parts can be essentially straight, or is arch.Thumb pad can be solid or hollow and be can be with plunger integrally formed or independently form and be connected on the plunger.Thumb pad comprises the sealing member that seals in the open rear end portion that is resisted against syringe body.Sealing member can be provided with along the bottom surface of thumb pad, makes thumb pad seal the outermost peripheral relative with the syringe body inwall against syringe body.Sealing member can be arranged on the neighboring of thumb pad and preferably the neighboring be taper, be difficult to prize thumb pad thus and get back to retracted position.

Preferably plunger locking mechanism is designed and is located such that when plunger locking mechanism is engaged (for example referring to Figure 12), and it also is pressed against the sealing member on the thumb pad on the outermost peripheral of syringe body.Thereby, obviously advantageously the sealing member on the thumb pad especially thumb pad is positioned to, make that the outermost edge of thumb pad and syringe body is overlapping, compare the sealing that can provide good with the inward flange that sealing is resisted against syringe body like this, in one situation of back, especially obtain still can leaking when extruding and slightly deformed lose normal shape at relatively thin wall body.

Syringe in a kind of form of the present invention can have one or more locking pieces and prevent that syringe from reusing.The example of these locking pieces is shown in Figure 17-23, with reference to these examples, another form of the present invention relates to a kind of syringe, it has syringe body, this syringe body has front end, open rear end, the plunger that can move along syringe body, this plunger has plunger body, be positioned at the forward plunger seal of plunger body, thumb pad at the plunger body rear portion, in the syringe body front end/on the syringe needle keeper, be connected the syringe needle on the syringe needle keeper, and back-plunger locking piece, it comprises by syringe body supporting and extends at least one deformable fingers in the syringe body at least in part, plunger has at the forward latch of plunger, when the abundant indentation of plunger, this latch engages with described at least one deformable fingers, latch and deformable fingers prevent plunger fully in the syringe body indentation come out.

Thereby in manufacture process, plunger can at first pass the open rear end insertion and the latch of this syringe body and will push deformable fingers open and can not destroy finger or plunger.Yet in case plunger inserts, the design of deformable fingers and latch makes plunger can not be moved out of from syringe body.

The syringe needle keeper can also insert from the rear portion of syringe body, and can not be subjected to the destruction of deformable fingers.

Can contemplate a pair of deformable fingers is set, and can contemplate them and be in part relative on the diameter of syringe body.Existence need have the situation more than a pair of deformable fingers, but what consider for the syringe of 1-10 mil is that a pair of deformable fingers is enough.

The position of described at least one deformable fingers should be designed such that plunger can not shifted out fully from syringe body, but wherein plunger still fully indentation with in the liquid suction syringe body.Usually, this means that described at least one deformable fingers is positioned at the injector syringe rear portion and just is in the front portion that extends laterally " alar part " that nearly all syringe all has usually.

Described at least one deformable fingers can comprise " beam type " rectangle part, and it is connected on the injector syringe and to the front portion of syringe at the rear portion and stretches out with cantilever.The size of deformable fingers can change, but considers that suitable size is the length of 3-20mm and the width of 3-10mm.Deformable fingers is essentially rectangle usually, but also can be other shape, for example ellipse, part circular or the like.

The cantilever finger is designed to extend in injector syringe a bit of and obtains inherent bias voltage in this position.Can contemplate finger crooked distance in injector syringe is 0.5-5mm and is generally 1-2mm.

Described at least one deformable fingers is designed to lock on the latch that leans against on the plunger and prevents the further indentation of plunger.In simple designs, the latch on the plunger can comprise the extension of a definite form and can comprise the collar, and it extends around plunger, makes the cover ring lock lean against on the deformable fingers, and with any irrelevant to rotation of plunger with respect to syringe.The collar can comprise that the location of the disk-like structure and the collar (latch) should be designed such that it engages with at least one deformable fingers when plunger is fully retracted, so that liquid can be drawn in the syringe body, but prevent that plunger is completely pulled out of syringe body.For this reason, preferably the latch on the plunger is positioned at the anterior of plunger body and preferably abuts against the plunger seal back.

Latch can have other design.For example, latch can comprise a series of projections of extending and being designed to engage with described at least one deformable fingers from plunger body.

Syringe can have any suitable shape and size and can contemplate the injectable capacity that syringe holds 1-20ml, and however, this capacity can change.

Plunger body can be essentially syringe needle and the syringe needle keeper of hollow to hold indentation.Yet, can also contemplate plunger body and have X type cross section and syringe needle and syringe needle keeper and can enter in the cavity between plunger body and the syringe body.

Plunger has thumb pad and these thumb pads usually at the plunger rear portion be conventional and well-known especially.Term " thumb pad " meaning is any design of being convenient to promote by finger usually plunger that is included on the plunger rear portion.

The syringe needle keeper can be included in or the multinomial middle design of describing in our the early stage patent application, but the design that can also be included in other patent application or in other commercial product or publication, describe.Usually, the syringe needle keeper comprises the definite part that can hold syringe needle and this part normally core or the inside of syringe needle keeper.The part of syringe needle keeper or syringe needle keeper remains on the anterior of syringe body and can be by " triggering " or controlled to impel the syringe needle indentation by alternate manner in a certain dismountable mode usually.In our early stage patent application, the syringe needle keeper is fixed on the front portion of syringe body by step or similar portions.In other design, the syringe needle keeper remains on (comprising friction member, driffractive ring etc.) front portion of syringe body by other device.

The part of syringe needle keeper usually by spring or like bias voltage with retroeflection in plunger body/syringe body, but by being held the generation that prevents This move in a certain way, this can comprise that frangible portion grades.

When plunger had been pushed to fully forward position, the part of the plunger that contacts by the part with the syringe needle keeper realized that a part for release needle keeper (comprising syringe needle) is to be used for the trigger action of indentation.

These indentation mechanisms have been described in our early stage patent application and in other publication.

Another form of the present invention relates to a kind of syringe, at least some parts of mentioning before it is included in also comprise plunger locking mechanism, this plunger locking mechanism in syringe all or when all liq is discharged from (zero mark) basically but before new syringe needle indentation mechanism triggers, prevent plunger retraction.

In this form of the present invention, plunger locking mechanism can be independently, or adds that the plunger that prevents that pro-is described is completely pulled out of the mechanism of syringe, perhaps can be mechanism independently.

Thereby, in this form of the present invention, (being commonly called zero mark plunger locking piece), syringe can only comprise that the plunger locking piece that zero mark plunger locking piece or zero mark plunger locking piece and pro-are described combines.

Zero mark plunger locking piece can comprise the anti-indentation mechanism of any kind, and this mechanism is in or operates during near the zero mark position at plunger.

Suitably, zero mark plunger locking piece comprises by at least one deformable fingers of syringe body supporting and is positioned at latch on the plunger rear portion, this latch engages with described at least one deformable fingers, thereby prevents plunger retraction when plunger is in the zero mark position.

It is similar that preferably described at least one deformable fingers and pro-are described, especially preferred be on zero mark plunger locking piece described at least one deformable fingers with prevent that plunger is identical from the deformable fingers that plunger body is fully retracted.Thereby this deformable fingers can be " dual-use function ".

Latch on zero mark plunger locking piece can have structure similar to the above and comprise the collar, dish or the one or more projection that engages with described at least one deformable fingers thus.Yet this latch preferred orientation is at the rear portion of plunger, make when plunger is pushed forward, latch will just pass through below described at least one deformable fingers before the zero mark position, passed through described at least one deformable fingers in case this means latch, then plunger retractable not.

Another form of the present invention relates to a kind of syringe, and it has syringe body, plunger and prevent that the plunger rear portion from being grasped so that the device of plunger retraction when fully forward the position that plunger is at least that all or nearly all liquid penetrated.Specify, utilize conventional syringe,, then still can grasp plunger end (being generally thumb pad) so that plunger retraction in case plunger is pushed forward.In this particular form of the present invention, the end that the design of syringe makes plunger to grasp is protected or capping and be not easy to be grasped.

In this form of the present invention, the cap member or cover or the like that extend around the sidepiece of plunger end when described device can comprise in plunger is pushed into syringe.For example, cover can comprise circular ring or the like that extends around the plunger sidepiece.The collar can comprise successive or a plurality of projections or like, makes can not grasp the edge of thumb pad to attempt to make plunger retraction.Be in this position in case another advantage of cap member or cover is a plunger, then operator can to see obviously that syringe shows safe and invalid.

Cap member/cover etc. can be arranged on other conventional type syringe.Yet preferably cap member/cover etc. is arranged on the safety injector with syringe needle indentation mechanism, and cap member/cover can be arranged on the safety injector of the above-mentioned type thus.

In the especially preferred form of the present invention, the syringe needle that comprises medical treatment device of a kind of syringe or other adequate types is provided, and it comprises the above-mentioned plunger locking piece that prevents plunger and be fully retracted from syringe needle, aforesaid zero mark plunger locking piece and aforesaid cap member/cover.

In this especially preferred form of the present invention, preferably indentation mechanism just was triggered before plunger back-end obtains the protection of cap member/cover etc.

In another form of the present invention, a kind of syringe is provided, it has syringe body, plunger, prevent when fully forward position that plunger is at least that all or nearly all liquid penetrated that the plunger rear portion from being grasped so that the device of plunger retraction and the latch on plunger, and it prevents plunger retraction when plunger is at least fully forward position.

In this form of the present invention, syringe can comprise aforesaid cap member/cover, and plunger can have another pintle hook lock part, and it is described similar and engage with described at least one deformable fingers that can make plunger retraction when plunger is in fully forward position with pro-.This form of the present invention can be counted as " dual safety " form, because comprising, it prevents that plunger end from being grasped the combination with the cap member/cover of indentation, engages to prevent another latch of plunger retraction but be provided with in some cases with described at least one deformable fingers.

Another form of the present invention is providing a kind of disposable syringe shown in Figure 24-29 and in this form of the present invention, and it comprises:

Syringe body with anterior and open rear portion,

Plunger, its retracted position that has front and rear and can in syringe body, be in the syringe body rear portion from the plunger front portion move to plunger syringe body to the anterior extended position that moves of syringe body,

Anterior the piercing through from recovering sealing member of extending of plunger, when the syringe needle indentation, syringe needle can penetrate described piercing through from recovering sealing member, and the sealing part is closed through after the sealing member basically at syringe needle,

The syringe needle keeper, it is anterior and have a rear surface towards plunger that it is positioned at syringe body, and described rear surface has at least two projections (for example 408,409), and they are suitable for making plunger seal intensity to slacken or break.

Be connected to the syringe needle on the syringe needle keeper,

Make syringe needle can be retracted into syringe body and/or the intravital trigger mechanism of plunger.

Will clearly realize that, if at this with reference to the disclosed content of prior art, then this reference is not to recognize that disclosed content has constituted the part of the common practise in this area of Australia or what its country in office.

Description of drawings

Embodiments of the present invention are described with reference to the accompanying drawings, among the figure:

Fig. 1 represents the front portion of syringe with cutaway view, and wherein plunger moves to the front portion of syringe, but still does not contact any part of retroeflection mechanism.

Fig. 2 represents that with cutaway view plunger has just begun to contact with the ledge of the outside of syringe needle keeper, and " arrow " structure that has just begun on the inside with the syringe needle keeper contacts.In this stage, still have significantly " dead band ", and retroeflection mechanism is not triggered also.

Fig. 3 represents that with cutaway view plunger has been pushed than position shown in Figure 2 more forward, and expression " arrow " structure begin the to stretch core of plunger seal, represent also that the plunger and the outside of syringe needle keeper form bigger contact and make the part of plunger seal obtain compressing to reduce the dead band.This position is just before triggering retroeflection mechanism.

Fig. 4 is illustrated in syringe needle (and inside of syringe needle keeper) that retroeflection mechanism has been triggered and the polluted syringe after being in the plunger gauge safely.

Fig. 5 A-C represents to have " chamfering " design with the outside of the syringe needle keeper that further makes the dead band minimum.

Fig. 6 represents one embodiment of the present invention, and it is that syringe comprises the position that a pair of spaced apart visual detector and plunger are in indentation basically.

Fig. 7 represents the plunger before triggering indentation mechanism just in the lump near visual detector.

Fig. 8 represents that plunger is in plunger latched position and plunger seal between spaced apart visual detector.

Fig. 9-Figure 12 represents main embodiment of the present invention, and the feature of syringe makes syringe can become " do not have and leak " syringe after indentation, makes syringe can be used in radiopharmaceutical or other hazardous material thus, and particularly,

Fig. 9 is illustrated in the syringe in the syringe needle indentation process.

Syringe after Figure 10 is illustrated in and is fully retracted.

Figure 11 is that the enlarged drawing of the preceding sealing member on the plunger after the indentation and expression are from recovering attribute.

Figure 12 is the enlarged drawing at syringe rear portion, the sealing member on the expression thumb pad.

Figure 13 represents aforesaid substantially syringe, but comprises the plunger locking mechanism of particular design this moment, and wherein plunger moves to the syringe needle keeper.

Figure 14 represents plunger shown in Figure 13, and wherein plunger has been promoted fully forward to make the syringe needle indentation to start trigger mechanism.

Figure 15 represents syringe shown in Figure 14, and wherein syringe needle retroeflection mechanism has obtained triggering and syringe needle is retracted in the plunger body.

Figure 16 is illustrated in plunger has in more detail been made after before pushing to fully plunger can be locked in mechanism on the syringe body.

Figure 17 represents the syringe according to one embodiment of the present invention, the device (for example cap member or cover) that it comprises back-plunger locking piece, preceding (zero mark) plunger locking piece and extends around the plunger rear portion when plunger is pushed forward.

Figure 18 represents cutaway view shown in Figure 17, and represents the just position before zero mark plunger locking piece structure of plunger.

Figure 19 represents that plunger is in the cutaway view of the syringe that is fully retracted the position, and expression back-plunger locking piece works to prevent that plunger is drawn out syringe body.

Figure 20 represents that plunger is fully retracted position moving to the zero mark position from shown in Figure 3.

Figure 21 represents preceding zero mark plunger latched position, the wherein locked in case indentation of plunger, but syringe needle indentation mechanism still also is not triggered.

Figure 22 represents trigger position, and wherein syringe needle keeper and syringe needle have been retracted in the plunger body and the rear end (thumb pad) of plunger body is in the protective cover, and can not be grasped and indentation thus.

Figure 23 represents another locking device, and it connects deformable fingers and provides another locking piece in case plunger retraction when syringe is in trigger position.

Figure 24-29 represents disposable syringe, and wherein the syringe needle keeper comprises a pair of flechette-type projection so that the thin film (sealing member) that extends is broken on the plunger front portion.

The specific embodiment

With reference to accompanying drawing, accompanying drawing represents to have the preferred implementation of the disposable syringe of indentation mechanism, and described indentation mechanism comprises " retroeflection " mechanism.Can be included in the mechanism of describing among our early stage patent application PCT/AU01/00183 and the PCT/AU2006/00462 according to the mechanism of preferred implementation, these two applications are incorporated herein by cross reference.

Designed polytype plunger locking mechanism, but in a preferred embodiment example, can adopt shown in Fig. 1-4 with the lower plunger locking piece.

With reference to accompanying drawing and at first with reference to Fig. 1, show the front portion of disposable syringe with cutaway view.Generally speaking, syringe comprises with lower member: have the syringe body 10 of the front end area 11 that comprises vertical passage 12, described passage has front portion 13 and rear portion 14; Hollow and comprise the plunger 15 of front surface 16; But on the front surface 16 of plunger 15, extend and have the puncture through seal part 17 of the marginal portion 18 that thickens; Comprise inner 20 and outside 21 syringe needle keeper 19, front portion 22, rear portion 24 and the intermediate host part 25 of the opening 23 on the inner front portion that also has syringe body of extending through 11 with arrowhead-shaped structure; Be fixed on the syringe needle (puncture needle) 26 on inner 20; The spring 27 that around intermediate host part 25, extends.Other details more specifically hereinafter will be described.

Syringe body 10 has the front end area 11 of band contoured (referring to Fig. 1).Contoured comprises the most forward opening 23, in opening 23 back and comprise the smaller diameter passage and the major diameter passage 12 of the part of intermediate host part 25, described major diameter passage 12 has constituted the extension of the endoporus of the syringe body of passing for plunger 15 substantially.

The inside 20 of syringe needle keeper 19 can not move through opening 23 (relying on intermediate host part 25 to have than anterior 22 bigger diameters and this diameter greater than opening 23).Thereby, if plunger 15 backup inside 20 then inner 20 can not be moved.

One termination of spring 27 is by the end of the smaller diameter passage of opening 23 back, and the other end of spring 27 just connects the little shoulder in the arrow structure back at inner 20 rear portion 24.Utilize this structure, spring is compressed and with inner 20 retro-reflective position that are biased in the hollow inside that is in plunger 15.Yet, prevent this situation by the inside 20 that is connected on outside 21.

Outside 21 in specific implementations is annular and extends fully and be on the zone of inner arrow structure around inner 20 that textural this point is shown in Figure 1.Outside 21 outer surfaces 28 that have on the inwall that is pressed against passage 12.Can on inwall, be provided with and connect portion for a short time, and prevent from outsidely to move to plunger so that outside 21 be in the appropriate location reliably.The outside is connected on the inside by the frangible part 29 that marks in Fig. 2.Frangible part 29 in specific implementations is extended between inside and outside fully.This prevents that fluid is in the front portion of the part leakage of syringe needle keeper and the passage 12 that bleeds.

Outside 21 comprise the ledge 30 (be clearly shown that, but also illustrate) that only (common about 1/4th) extend around exterior section ground in other accompanying drawing in Fig. 2.Ledge gives prominence to and plays the effect that reduces to trigger the required pressure of retroeflection mechanism on the direction of plunger 15, this point will be described hereinafter in more detail.

The triggering of retroeflection mechanism similar slightly with described in our the early stage international patent application that above provides, and occur in plunger 15 basically and be compressed to when soon being resisted against on the syringe needle keeper, this point illustrates in Fig. 2-3 gradually.At this moment, plunger contact outside 21 and plunger further promote forward the outside can be pushed forward along passage 12.Because the inside 20 of syringe needle keeper can not be moved with the same manner, exert pressure and will cause frangible part 29 to be broken to plunger continuously, discharge inner 20 from outside 21 thus.In a single day this situation takes place, and spring 27 just makes inner 20 front portions of passing (comprise and pierce through syringe needle 26) plunger 15 penetrate and inject the hollow inside of plunger.Figure 4 illustrates the final position.

Yet, in the present invention, made improvement so that some advantage to be provided.Improvement only comprises externally and on 21 the part ledge 30 is set.Thereby, when plunger 15 when position shown in Figure 1 moves forward to position shown in Figure 2, the edge 31 contact ledges 30 (referring to Fig. 2) of plunger.In this stage, the remainder of plunger still can not contact outside 21 remainder; But only the part of plunger (edge 31) contacts an only outside part (ledge 30).Like this power of plunger is only concentrated on outside 21 the part and the frangible part on this zone can be broken.After having been found that in a single day the part of frangible part is broken, the remainder of frangible part just can utilize littler power to break.

Yet another improvement is also to have reduced the dead band.The dead band is defined as the volume that the design because of internal part can not be discharged from from syringe.Obviously, the capacity in dead band should reduce as much as possible.

In the present embodiment, in case plunger is in position shown in Figure 2, then between the edge 31 of plunger and outside ledge 30, only exist slightly to contact.Inner arrow part has also contacted sealing member 17 and has begun the sealing member that stretches, and sealing member is attenuated.Yet in this stage, retroeflection mechanism also is not triggered, because frangible part also is not stretched and breaks.

On the contrary, plunger slightly more moves forward as shown in Figure 3.Move forward and need not too many (perhaps 1mm), but be enough to make sealing member 17 to form relative the contact closely to reduce dead volume with the inward flange of syringe needle keeper.In order to adapt to ledge 30, the edge 31 of sealing member 17 thicker relatively (comparing) and can be compressed or push with the forward remainder of sealing member.Therefore, in position shown in Figure 3, plunger moves more forward and ledge 30 has been compressed in the elastic edge 31, and still can not trigger retroeflection mechanism.Can see that at this ad-hoc location the remainder of plunger front contacts with the remainder of outside 21 this moment.In this position, the dead volume when dead volume is in position shown in Figure 2 with respect to plunger is reduced.

Further moving forward of plunger at this moment along passage 12 promotions outside 21 and because the existence of ledge 30, maximum power (and impetus of consequent maximum) will act on the ledge 30, cause so only dividing in this zone frangible portion taking place preferably to rupture or break.Thereby the required power of frangible partial rupture is reduced.In case frangible part is preferably broken, then finding needs littler power that the remainder of frangible part is broken fully.When plunger is pushed forward, sealing member 17 is also further stretched by inner 20 arrow structure and sealing member is broken via the arrow structure, perhaps the release of spring is enough to make syringe needle inner and that pollute to be penetrated at this moment to wear sealing member and enters in the hollow plunger, and this point is shown in Figure 4.Outside 21 slight inclination when it is pushed forward.

Described structure is found to make and triggers the required power of retroeflection mechanism and be reduced to 2-3kg from 9kg roughly.Retroeflection mechanism is still very firm and be not made into " very weak " in order to reduce required power.This point realizes by the design that externally has ledge on 21 relatively routinely and have sealing member and need not any complexity in the plunger front portion on plunger.By making plunger can become relatively conventional plunger, ledge 30 can partly be pushed in the edge of (being pressed into) sealing member to reduce to trigger retroeflection mechanism dead band before.Do not have to consider that a kind of so simple relatively and reliable mechanism can be used for complicated plunger shape.

If desired, each side of abutment 44 can have " chamfering " 45 further to make the dead band minimum.Common chamfering has been shown in Fig. 5 A-C.

With reference to Fig. 5 A-C, show improved syringe needle keeper 45, it is similar to the above and also comprise the outside 45A with ledge 44, described ledge and above-mentioned ledge are similar, except ledge 41 comprises a pair of chamfering 45B at this moment in addition, the shoulder of 45C form, they extend downwardly into the surface of outside 45A.Chamfering 45B, 45C and ledge 44 are integrally formed.Described structure is designed such that ledge 44 comprises initial contact stud chock plug and the outside can be utilized " going up most " portion that the power that reduces is removed internally.Therefore, specifically as shown in Figure 5, the projecting chamfering 45B of the profile of ledge 44,45C makes removing of outside 45A still can occur in less relatively surf zone (just ledge 44) and upward also can utilize the power that reduces thus.

Chamfering 45B, the effect of 45C is to reduce otherwise the dead band that can form between stopper head and syringe needle keeper.For convenience of explanation, before triggering retroeflection mechanism, the outside 45A of syringe needle keeper is to lopsidedness and begin internally to break.In this stage, there is not chamfering 45B, can there be relatively large volumetrical dead band in 45C, therefore leaves the medicine of relatively large amount before triggering retroeflection mechanism in syringe.By chamfering is provided, the dead band is reduced and otherwise can stay medicine in the gap between plunger and the syringe needle keeper and pass syringe needle and be pushed out.

Referring now to Fig. 9-12 of a plurality of parts of expression syringe, because syringe can not leak in syringe needle is retracted into syringe body the time, so these parts make syringe can be used to nuclear pharmaceuticals or other hazardous material.Fig. 9 represents that syringe is in moment of syringe needle generation indentation and Figure 10 and represents that syringe needle has been retracted into the syringe in the gauge of plunger body safely.Syringe has the syringe body 50 of band anterior 51 and open rear end portion 52.Plunger 53 is configured to have opened front end 54 and closed rear end can maintained interior zone after indentation to limit syringe needle.Opened front end 54 is by piercing through from recovering sealing member 55 sealings of being clearly shown that in Figure 11.Sealing member 55 formations prevent that around a part and 56 conducts of bigger sealing member of the bigger sealing member 56 of the front side wall extension of plunger 53 fluid from flowing through the common plunger seal of plunger.In this specific implementations, sealing member 55 and sealing member 56 are integrally formed.Circumferential rib 57 is in plunger seal 56 (referring to Figure 11) back.The effect of rib 57 is to prevent that by the bonding part 58 of contact in the syringe body (shown in Figure 12 and hereinafter will describe bonding part 58 in more detail) plunger is completely pulled out of syringe body.Yet generally speaking, if plunger is pulled too (for example drawing up radioactive fluid from bottle) far away, in a certain stage, rib 57 will collide bonding part 58 and will prevent that like this plunger is completely pulled out of syringe body, so also makes syringe safe be used for nuclear pharmaceuticals etc.This part can be called as " crossing indentation protection locking piece ".

Syringe comprises the syringe needle 60 that is connected on the syringe needle keeper, and the syringe needle keeper comprise the inside 61 that directly links to each other with syringe needle and outside 62, inner 61 with outside 62 by rupturing or breakable element links to each other.Spring 63 also is set, and these features are with described identical or similar with reference to Fig. 1-4.

Thereby, when plunger is pushed to syringe body when anterior, in a certain stage, plunger will trigger indentation mechanism and inner 61 and syringe needle 60 and spring 63 will pass oneself and recover the home that sealing member 55 is injected plunger body (referring to Figure 10).Sealing member 55 is closed because of its resilient property subsequently.In this stage, be retained in the syringe needle or any hazardous material of syringe needle outside can not pass sealing member 55 and refluxes out from the open front of syringe body.

The rear portion of plunger 53 is formed a plurality of little rectangular aperture 65 (referring to Fig. 9) with the wall that passes plunger 53.These openings 65 are as the latch that is used for inner 61.With reference to Figure 10, opening 65 is passed in inner 61 (especially " arrow " parts 66 of inner 61) emission when the syringe needle indentation, is locked in by arrow part 66 and prevents on the opening 65 that the syringe needle attempt from returning out from plunger.Yet, so also formed the opening that passes plunger wall, therefore make leakage that hazardous material can be by passing opening 65 from plunger inside across and into syringe body inside.

For this reason, plunger body 53 is formed the thumb pad 67 with particular design, and it is clearly shown that in Figure 12.Thumb pad 67 comprises flat inner surface 68 and dome shaped outer surface 69.The inner surface of thumb pad 67 has lip ring 70.The design of thumb pad 67 makes sealing member 70 connect and seal the outermost edge of opening 71 at syringe body back (also referring to Fig. 9).Thereby, when thumb pad is in Figure 10 and sealing station shown in Figure 12, can make any liquid that can not of process between plunger and the syringe body flow out the rear portion of syringe.Therefore, in position shown in Figure 10, syringe obtains complete closed and anti-leak, and the liquid of any potential danger can not spill the front portion (because sealing member 55 and sealing member 56) of syringe in fact or spill the rear portion (because sealing member 70) of syringe.

Be provided with plunger locking mechanism with the time locking plunger that is in position (this is that plunger has triggered retroeflection mechanism and syringe needle has been retracted into the intravital position of plunger) fully forward at plunger in case indentation.Need this mechanism because otherwise with regard to the integrity of entail dangers to sealing member 70, this be because can make simply plunger slightly indentation to discharge the sealed engagement between sealing member 70 and the edge 71.Plunger locking mechanism is clearly shown that in Figure 12 and comprises from the collar 72 of the rear portion extension of plunger 53.The collar 72 has tapered edge 73.Make plunger can at first be pulled (with in the fluid suction syringe) like this and also be pushed forward subsequently, in a certain stage, the collar 72 will place below the bonding part 58.Yet in case the collar 72 is in bonding part 58 when anterior (referring to Figure 12), the collar will lock bonding part 58 to prevent plunger retraction.The design of the collar and location make when the collar connects bonding part 58, and it also guarantees sealing member 70 on the thumb pad 67 and edge 71 sealed engagement on the syringe body back.

Bonding part 58 comprises that the wall portion that thickens slightly of syringe body can lock the abutment/shoulder of the collar 72 etc. with formation.It will also be appreciated that a certain additional encryption sealing is set in this zone.

Plunger locking mechanism (for example the collar 72) is even remain on regional location with plunger and guarantee that not being impossible also be to be difficult to attempt to make plunger retraction.

Thumb pad 67 comprises and allowing or guiding thumb pad 67 reaches the tapering part 74 (referring to Figure 12) of sealed engagement shown in Figure 12.

If it is outstanding that sealing member 55 is passed in some maintenances in trigger process medi-spring 63, can find that then sealing member 55 still keeps normal around spring, prevent that thus any fluid from passing seal leakage.

With reference to Fig. 6, show the front area of syringe, comprise injector syringe 100, be positioned at front portion 110, syringe needle 120 on the injector syringe front portion, be positioned at the syringe needle keeper 130 of injector syringe front portion and be positioned at compression spring 140 around the syringe needle keeper, more details can be found hereinafter with in the above-described patent application.

Plunger 150 comprises the preceding sealing member 160 that is generally black or contrast color.

Syringe needle keeper 130 comprises by the outside of the inwall maintenance of syringe and the inside that holds syringe needle and spring.When plunger was pushed forward, preceding sealing member 160 pressed the outside and the outside is moved with respect to inside.This point can be counted as " triggering " position, in case and This move take place, the spring elongation is injected inside and spring and syringe needle in the hollow posts cock body (or syringe).

Colour band 170 is positioned at around the syringe and is positioned to the outside extension of cast-over head keeper.Thereby when plunger was pushed forward to position shown in Figure 7, plunger seal 160 was near being with 170 and have a clear sight indication, and just trigger action will take place and all medicines all are discharged from from syringe.

Further moving forward of plunger 150 will trigger indentation mechanism and will impel the syringe needle retroeflection to arrive in the gauge of plunger body (referring to Fig. 8).

When plunger further moved forward, plunger seal 160 will move through was with 170 and be with 180 to move to second.With 170 and separate with 180 transparent parts 190 (common whole syringe is made by same material transparent or substantial transparent) by syringe.When plunger seal 160 be with 170 and be with 180 between the time (referring to Fig. 8), plunger locking mechanism engages with the locking plunger in case its indentation.

By observe plunger seal be with 170 be with 180 between and plunger obtained locking exist clear sight to indicate.

Figure 13-16 expression can be used for the plunger locking mechanism of disposable syringe described herein.Syringe shown in Figure 13-16 comprises syringe body 210, front portion 213, rear portion 214, plunger 215, plunger seal 217, syringe needle 226, the spring 227 with front end area 211, syringe needle keeper 219 and the thickening edge on plunger seal 217 218 that comprises inside 220 and outside 221.

The outside 221 of syringe needle keeper remains on the appropriate location by limited part 240, and the zone of sloping portion to provide diameter to reduce on the inwall of main body 210 is provided described limited part, and forms limited part 240 thus.

Plunger 215 and the described plunger of pro-difference slightly are in sealing member 217 back the small circumference latch 241 that is clearly shown that is arranged in Figure 16.Latch 241 is integrally formed with plunger 215, and extends around plunger 215.Latch 241 has contoured in specific implementations, and it is included in the preceding guide face 242 that is clearly shown that among Figure 16 and the shoulder 243 of " rear end " abrupt change.

In use, when plunger 215 is pushed to syringe needle keeper 219, it begins trigger process in same as described above or substantially similar mode, because the edge 218 of sealing member 217 is the abutment 244 on the backup outside 221 at first, utilize making every effort to promote of reducing to make outside 221 220 to move internally at least in part like this.In a certain stage, inner 220 amount of movement is enough to make spring 227 elongations and makes inside 220 pass sealing member 217 to be injected in the gauge of plunger 215.

Plunger 215 can further be pushed to position shown in Figure 15 from position shown in Figure 14 subsequently.Like this, plunger 215 will be moved further outside 221 along the forward middle passage of injector syringe, and in a certain stage, latch 241 will push away limited part 240.Be convenient to realize this point by the preceding guide face 242 on the latch 241.In case latch 241 has been pushed over limited part 240, then abrupt change shoulder 243 makes plunger be difficult to be retracted in the syringe body.Therefore plunger is " locked " in syringe body, and the needle safety of Wu Raning is in the gauge of plunger simultaneously.

An advantage of this structure is because the plunger locking mechanism utilization is anterior and the syringe keeper remained on the existing limited part of appropriate location at syringe, so plunger locking mechanism only needs the minor alteration (so that latch 241 to be provided) to plunger 215 and need not any other parts of plunger are made other change.

If desired, each side of abutment 244 can have " chamfering " 245 further to reduce the dead band.Pro-shows conventional chamfering.

With reference to Figure 17-23, show the syringe that comprises a plurality of plunger locking mechanism, although described embodiment refers to the syringe of the combination that comprises plunger locking mechanism, should be realized that the present invention also expands to the syringe that only comprises a plunger locking mechanism or its any other plunger locking mechanism combination.

At first with reference to Figure 17, the syringe 310 that illustrates has main body 311, the syringe needle 312 that extends from the front portion of syringe body 311 and the plunger 313 with circular back thumb pad 314.With reference to Figure 18, the forward plunger seal 316 that plunger 313 has plunger body 315 and is positioned at plunger body 315.Plunger 313 be hollow holding the syringe needle of indentation, this point will be described hereinafter in more detail.

Syringe needle keeper 317 and syringe needle 312 connections are set thereon.In specific implementations, syringe needle keeper 317 is included in the one or more middle design of describing in our the early stage disclosed patent application, and generally speaking, syringe needle keeper 317 comprises outside 318 and inner 319.The little compression spring 320 of inner 319 supportings.Inside 319 can be connected with the mode that throw off the outside with inside with outside 318.Move when syringe needle indentation (triggering) mechanism is pushed against on the syringe needle keeper 317 in the front portion of plunger 313, and when this action took place, plunger preferably promoted outside 318, impel the outside to separate like this with inner 319.At this moment, 320 elongations of compression spring are so that the inside 19 of syringe needle keeper is injected in the plunger body with the syringe needle 312 that is connected, and as Figure 22 and shown in Figure 23, outside 318 remain on the front portion of injector syringe.

Syringe 310 comprises and prevents that plunger 313 is completely pulled out of the back-plunger locking mechanism of syringe body 311.This back-plunger locking mechanism obtains detailed description with reference to Figure 17-19 and illustrates.Particularly, the back-plunger locking mechanism comprises a pair of deformable fingers 321 that is positioned at the rear end of plunger body 311 in mode relative on the diameter.Figure 17 only illustrates a deformable fingers 321, and Figure 18 illustrates (with section) two deformable fingers 321.Each deformable fingers comprises smaller rectangular element, and its rear portion is connected on the syringe body and in the cantilever beam mode extends to the front portion of syringe body.Deformable fingers adopts aduncate slightly structure usually, makes it outstanding in injector syringe slightly.Figure 18 illustrates this aduncate slightly structure.

In initial assembling process, the open rear end that plunger 313 can pass main body is inserted and by in the syringe body that partly pushes them.In this course, plunger will push away deformable fingers and temporary transient outside the distortion so that plunger front can be passed through of finger general.Afterwards moment, its aduncate slightly structure is got back in the finger distortion.

Plunger front has the latch 322 that is located immediately at sealing member 16 back, and in specific implementations, latch 322 is included in round flange or the dish on the plunger body.Figure 19 illustrates the part of latch 322.

Thereby, in case plunger at first has been inserted in the injector syringe (position for example shown in Figure 180), then plunger in a usual manner indentation with in the liquid suction syringe body, but indentation will impel latch 322 locks to lean against the end (referring to Figure 19) of deformable fingers 321, so further prevent plunger retraction.

The latch front portion has little chamfered portion 323 (referring to Figure 19), and it promotes plunger initially to insert in the syringe by the temporary transient distortion that helps finger element 321.

Thereby aforesaid plunger locking mechanism can be counted as " the back-plunger locking piece " that prevents that plunger from contracting and in the syringe fully.

Syringe according to preferred implementation also has " the zero mark plunger locking piece " that is clearly shown that in Figure 21.In specific implementations, " zero mark " be plunger be in all or basically all fluid penetrated but position that indentation mechanism still is not triggered.Figure 21 shows this position, and wherein plunger front (for example sealing member 316) connects syringe needle keeper 317, but is not also further promoted forward to trigger indentation mechanism.In order to prevent plunger, be provided with " zero mark plunger locking piece " in this " zero mark " position indentation.In preferred implementation shown in Figure 21, plunger body 315 has another latch (referring to Figure 21) of circular discs or the collar or projection 324 forms.This latch 324 is positioned at the rear portion of plunger and figure 20 illustrates latch 324.When plunger when move the zero mark position, latch 324 (also having little front bevel) promotes below and makes finger 321 temporarily be out of shape and be positioned at the front portion of finger 321.In this position, when latch 324 engaged with finger 321, plunger is retractable not.

Comprise another security feature according to the syringe of this preferred implementation and prevent plunger retraction when being triggered in indentation mechanism.Described another security feature is shown in Figure 22 and be included in circular enclosure 326 (also figure 17 illustrates cover 326) on the rear portion of syringe body 311.The length of plunger 313 is designed such that when plunger has been pushed forward fully and connects syringe needle keeper 317 when triggering indentation mechanism, the thumb pad 314 of plunger 313 or the other end drop in the cover 326 (referring to Figure 11 and Figure 23), can recognize that thumb pad almost can not grasp to attempt to make plunger retraction for 314 this moments.If thumb pad is ellipse or difformity, then cover will have the edge of respective shapes with sealed plunger.

Yet; for safety further is provided; another plunger locking mechanism shown in Figure 23 can be set, and it is included in another latch 328 of latch 324 back, and this latch 328 is designed to connect deformable fingers 321 when the plunger thumb pad is protected by cover 326.Thereby even can grasp the rear portion of plunger 326, any indentation also can impel latch 328 locks to lean against on the finger 321, if this latch lost efficacy, then latch 324 locks lean against on the finger 321.

With reference to Figure 24-29, the disposable syringe that illustrates comprises injector syringe 400, plunger 401, syringe needle 402, this syringe needle be bearing in syringe needle keeper (in Figure 26, being clearly shown that) go up and comprise supporting syringe needle 402 and support retroeflection spring 404 inside 403 and outside plate-like part 405, it comprises that " protuberance " 406 is to reduce to trigger the required power of retroeflection mechanism, this point is with described similar before, and the described ledge of " protuberance " 406 and pro-30 is similar.The difference of this embodiment (being clearly shown that in Figure 28 and Figure 29) is that the inner surface 407 (referring to Figure 28 and Figure 29) of syringe needle keeper has flechette-type projection 408,409 relative on a pair of diameter.These projections are convenient to plunger seal 410 (referring to Figure 26) when plunger seal is pushed against on the inner surface 407 stretching/attenuation/intensity slackens/breaks.Similar described in first section described our early stage patent application of this structure and the specific embodiment of the invention except in our early stage patent application, only is provided with single projection.This ad hoc structure is particularly useful for small-sized 1mL " insulin " syringe.Such syringe (disposable syringe) has been shown in Figure 24-26.

Parts that describe in description and illustrated in the accompanying drawings and element can appropriate combination and couplings.Thereby " protuberance ", " chamfering ", " position indicator ", various locking mechanism and sealing member can be applied to described and shown in but the unshowned syringe variation of specific features itself.For example, can on the syringe shown in Figure 17-23, chamfering be set.

In whole description and claim (if), unless context has requirement in addition, otherwise term " comprises (comprise) " or variation will be understood that to comprise mentioned whole or whole group as " comprising (comprises) " or " having (comprising) ", but does not get rid of any other whole or whole group.

In whole description and claim (if existence), unless context has requirement in addition, otherwise term " basically " or " approximately " will be understood that to be not limited to the value range by this terminology states.

Any embodiment of the present invention all only is exemplary and does not mean that limitation of the present invention.Therefore, should be realized that under the premise without departing from the spirit and scope of the present invention and can make multiple other change and modification described any embodiment.

Claims (according to the modification of the 19th of treaty)

1. disposable syringe, has the syringe needle that after using, is retracted in the syringe, when the syringe needle indentation, syringe sealed in case still stay on the syringe needle or syringe needle in any liquid anterior or leak from syringe from the syringe rear portion, described syringe comprises:

Syringe body with anterior and open rear portion,

Anterior the piercing through from recovering sealing member of extending of plunger, when the syringe needle indentation, syringe needle can penetrate described piercing through from recovering sealing member, and the sealing part is closed in fact through after the sealing member at syringe needle,

Sealing member on the plunger sidewall, sealing member seals up the inwall of syringe body described in the process that moves in syringe body when plunger,

Be positioned at the forward syringe needle keeper of syringe body,

Be connected the syringe needle on the syringe needle keeper,

Thumb pad at the plunger rear portion, and

Sealing member on thumb pad, it seals the open rear end portion that is resisted against syringe body in case liquid leaks from the rearward end of syringe body when syringe needle indentation,

Thus, after syringe needle is using during indentation, anterior the piercing through from recovering sealing member and the sealing member on the plunger sidewall prevents that liquid from passing the syringe front portion and from syringe needle any leakage taking place of extending of plunger, and the sealing member on the thumb pad prevents that liquid from passing the syringe rear portion and from syringe needle any leakage taking place.

2. syringe as claimed in claim 1 is characterized in that, plunger locking mechanism comprises the projection of extending from plunger, and its protrusion engagement that extends internally with inwall from syringe body is to prevent plunger retraction.

3. syringe as claimed in claim 2 is characterized in that, the projection of extending from plunger comprises the circular plate of extending from the plunger rear portion, and comprises the circumference abutment that is positioned at the syringe body rear portion from the projection that the inwall of syringe body extends internally.

4. syringe as claimed in claim 2 is characterized in that thumb pad comprises inner surface and outer surface, and the sealing member on the thumb pad is around the inner surface edge setting and be suitable for sealing up the open rear end portion of syringe body.

5. syringe as claimed in claim 4, it is characterized in that, plunger locking mechanism is positioned in the syringe, makes that the open rear end portion of sealing member on the thumb pad and syringe body carries out sealed engagement when plunger is locked on the syringe body by plunger locking mechanism.

6. syringe as claimed in claim 5 is characterized in that, when plunger is locked on the syringe body in case during its indentation, trigger mechanism is triggered so that the syringe needle indentation.

7. syringe as claimed in claim 5 is characterized in that, the inner surface of thumb pad has the tapering part (74) that directly extends later at sealing member.

8. syringe as claimed in claim 1, it is characterized in that, plunger front comprises circumferential seal (56), it makes the inner wall sealing ground of plunger and syringe body and is sliding engaged in the process that plunger moves in syringe body, described circumferential seal and can pierce through oneself to recover sealing member (55) integrally formed.

9. syringe as claimed in claim 8, it is characterized in that, plunger has hollow body, the syringe needle of indentation and a part of syringe needle keeper can enter in it, plunger has the sidewall that comprises at least one little opening (65), the latch that described little opening shifts out from plunger as the syringe needle that prevents indentation.

10. syringe as claimed in claim 4 is characterized in that the syringe needle keeper comprises the inside that links to each other with syringe needle; The outside integrally formed with inside; Frangible part between inside and outside, the outside is maintained at the front portion of syringe body; And the spring of the inside of cast-over head keeper extension.

11. syringe as claimed in claim 10 is characterized in that, the inwall of syringe body comprises abutment, and outside by being maintained at the front portion of syringe body with engaging of abutment.

12. syringe as claimed in claim 11 is characterized in that trigger mechanism comprises plunger front, its outside with the syringe needle keeper contacts and shifts out internally along frangible part at least a portion with the outside of syringe needle keeper.

13. syringe as claimed in claim 12 is characterized in that, the outside of syringe needle keeper comprises the protuberance in the face of plunger, connects protuberance by plunger and forms initial contact, thereby utilize the power that reduces to begin trigger process.

14. syringe as claimed in claim 10, it is characterized in that, comprise at least one visual detector that is located on or near trigger position and second visual detector that is positioned at the first visual detector front, syringe body is partially transparent at least between first visual detector and second visual detector, makes can observe plunger seal in that position when plunger is pushed into position between them.

15. syringe as claimed in claim 14 is characterized in that, each visual detector comprises the colour band that extends around syringe body.

16. a disposable syringe comprises:

Syringe body with anterior and open rear portion,

Be positioned at the forward syringe needle keeper of syringe body,

Be connected the syringe needle on the syringe needle keeper,

Thumb pad at the plunger rear portion, and

Sealing member on thumb pad, its when syringe needle indentation, seal up syringe body open rear end portion in case liquid leak from the rearward end of syringe body.

17. a disposable syringe comprises:

Syringe body with anterior and open rear portion,

Be positioned at the forward syringe needle keeper of syringe body,

Be connected the syringe needle on the syringe needle keeper,

The locking plunger is in case the plunger locking mechanism of its indentation when syringe needle indentation.

18. a disposable syringe comprises:

Syringe body with anterior and open rear portion,

Plunger, its retracted position that has front and rear and can in syringe body, be in the rear portion of syringe body from the plunger front portion move to plunger syringe body to the anterior extended position that moves of syringe body,

It is anterior and have towards the syringe needle keeper of the rear surface of plunger to be positioned at syringe body, and described rear surface has at least two projections (408,409), and described projection is suitable for making plunger seal intensity to slacken or breaks,

Be connected the syringe needle on the syringe needle keeper,

19. syringe as claimed in claim 18 is characterized in that, comprises the 1ml insulin syringe.

20. a disposable syringe comprises:

The syringe body that comprises front end area, described front end area comprises the vertical passage with front and rear,

Comprise the plunger that extends to the front surface in the syringe body,

But the puncture through seal part that on the syringe front surface, extends,

Be connected within the syringe front surface and on the syringe needle keeper,

Be connected the syringe needle on the syringe needle keeper,

But it is anterior and obtain bias voltage and with the puncture through seal part that passes on the plunger front surface syringe needle keeper is injected the spring of plunger to be positioned at syringe body,

The syringe needle keeper comprises inside and outside, and inside holds syringe needle, and the outside rear portion that engages with the wall of vertical passage and be positioned at passage at first also is included in the frangible part between inside and the outside,

The outside comprises the ledge of fingerpost plug sealing member, this ledge only extends around interior section ground, ledge has played and has made plunger have the effect in the zone that initially contacts with the outside of syringe needle keeper, reduces to make frangible partial rupture to trigger the required power of retroeflection mechanism thus.

21. a disposable syringe comprises:

The syringe body that comprises front end area, described front end area comprises the vertical passage with front and rear, and at the limited part of channel rear portion,

Comprise the plunger that extends to the front surface in the syringe body,

But the puncture through seal part that on the syringe front surface, extends,

Be connected within the syringe body front area and on the syringe needle keeper,

Be connected the syringe needle on the syringe needle keeper,

The syringe needle keeper comprises inside and outside, and inside holds syringe needle, and limited part outside and on the passage engages, and also is included in the frangible part between inside and the outside,

When plunger was pushed against outside going up, plunger impelled inside to separate at least in part with the outside, and described separation makes spring inside can be passed sealing member and penetrates,

Plunger has latch, and in the time of in plunger is pressed into syringe body, latch engages with limited part to prevent that plunger from continuing indentation.

22. a syringe comprises: the syringe with front and rear; Plunger, its can move to along syringe is in the syringe rear portion from the plunger front portion retracted position plunger along syringe to the anterior extended position that moves of syringe; Be positioned at the forward syringe needle keeper of syringe, be connected the syringe needle on the syringe needle keeper; Make syringe needle can be retracted into syringe body and/or the interior trigger mechanism of plunger; The locking plunger is in case the plunger locking mechanism of its indentation when plunger slips over trigger position; Second visual indication that is located on or near first visual indication of trigger position and is positioned at the first visual indication front, syringe is partially transparent at least between first visual indication and second visual indication, making can be from observing plunger seal in that position when plunger is pushed into therebetween position, structure and structure are when close first visual indication of plunger seal, there is visual indication, show that trigger action will begin, in the time can passing syringe observe plunger seal between first visual indication and second visual indication, plunger is in latched position in case its indentation.

23. a syringe has:

Syringe body with front end and open rear end,

The plunger that can move along syringe body, the thumb pad that plunger has plunger body, is positioned at the forward plunger seal of plunger body and is positioned at the plunger body rear portion,

Be positioned at the syringe needle keeper of syringe body front end,

Be connected the syringe needle on the syringe needle keeper, and

The back-plunger locking piece, it comprises by syringe body supporting and extends at least one deformable fingers in the syringe body at least in part, plunger has latch in the plunger front portion, when the abundant indentation of plunger, described latch engages with described at least one deformable fingers, latch and deformable fingers prevent plunger fully from syringe body indentation come out.

24. syringe as claimed in claim 23 is characterized in that, comprises second plunger locking mechanism, its in syringe all or when all liq has been discharged from basically (zero mark position) but before syringe needle indentation mechanism triggers, prevent plunger retraction.

25. a syringe comprises:

Syringe body with anterior and open rear end portion,

Plunger, its have front and rear and can slide into along syringe body is in the syringe body rear portion from the plunger front portion retracted position plunger along syringe body to the anterior extended position that moves of syringe body,

Be positioned at the forward syringe needle keeper of syringe body,

Be connected the syringe needle on the syringe needle keeper,

Thumb pad at the plunger rear portion, and

Sealing member on thumb pad, its open rear end portion that seals up syringe body when syringe needle indentation leaks from the open rear end portion of syringe body to prevent liquid.

Claims

1. disposable syringe, have the syringe needle in the indentation syringe after using, and, when the syringe needle indentation, syringe sealed in case still stay on the syringe needle or syringe needle in any liquid anterior or leak from syringe from the syringe rear portion, described syringe comprises:

Syringe body with anterior and open rear portion,

Sealing member on the plunger sidewall, sealing member is sealed on the inwall of syringe body described in the process that moves in syringe body when plunger,

Be positioned at the forward syringe needle keeper of syringe body,

Be connected the syringe needle on the syringe needle keeper,

Thumb pad at the plunger rear portion, and

Sealing member on thumb pad, its when syringe needle indentation, seal up syringe body open rear end portion in case liquid leak from the rearward end of syringe body,

16. a disposable syringe comprises:

Syringe body with anterior and open rear portion,

Be positioned at the forward syringe needle keeper of syringe body,

Be connected the syringe needle on the syringe needle keeper,

Thumb pad at the plunger rear portion, and

17. a disposable syringe comprises:

Syringe body with anterior and open rear portion,

Be positioned at the forward syringe needle keeper of syringe body,

Be connected the syringe needle on the syringe needle keeper,

18. a disposable syringe comprises:

Syringe body with anterior and open rear portion,

Be connected the syringe needle on the syringe needle keeper,