CN101203258A - Improved controlled retraction syringe and plunger therefor - Google Patents

Abstract

A retractable syringe (10) and plunger (20) therefore are provided, the syringe having a barrel (20), a retractable needl mount (40) to which is mounted or is mountable a needle (11), and a plunger (80), the plunger comprising an initially compressed spring (60), a means for engaging the retractable needle mount, an integrally formed plunger seal (22) and a removable controlling means (70) for facilitating control of the rate of retraction of needle mount when engaged wit plunger. The needle mount is held in the barrel by a holding means which prevents inadvertent retraction of the needle mount when the plunger is withdrawn to fill the syringe. The holding means comprises a plurality of clips (196A, 196B, 196C) that may be integrally formed with the barrel or may be present on a cap mounted to the barrel. An ejector means (52) is also provided, whereby plunger depression can urge the ejector means to release the needle from the holding means and thereby allow retraction of the needle mount following decompression of the spring.

Description

Improve the retractable syringe and the plunger thereof of control

Technical field

The present invention relates to syringe.More particularly, the present invention relates to comprise that controlled cam mechanism is to prevent the reusable retractable syringe of syringe.

Background technology

Continuously between the user without suitable sterilization and the behavior of shared syringe is the principal element of human immunity defective virus (HIV) and hepatitis propagation, it produces serious influence to the patient subsequently, and causes society the patient to be supported and provide the medical treatment high expense that care is produced.

Be used to prevent the reusable syringe of syringe for tackling this problem, having developed.

A solution of the syringe of being developed is in the syringe of the permanent retraction syringe of syringe needle, and by the spring driving retraction of compression, for example this scheme is described in the open WO 01/80930 in the world.For example provide the pretensioned spring of resistance to combine, can be " sensation " that the syringe user provides improvement, as described in the open WO 2004/082747 in the world by will not taking out to press to plunger.

But spring decompression is uncontrolled relatively, and in use it causes excessively strong needle retractable, when in the syringe needle retraction syringe, because air is forced to leave injector syringe, can causes blood and splash.

Another problem relevant with retractable syringe is that plunger must align with retractable needles, but so that be positioned at additional engagement device on the plunger and retractable needles does not engage before retraction, but can engage when needed to promote the retraction of syringe needle.

Thisly align manufacturing cost and the selling price that true localized requirement can increase retractable syringe, this has damaged the commercial appeal of retractable syringe, especially when third world countries' large-scale production and mass marketing.

Summary of the invention

The present invention is directed to a kind of broad form of retractable syringe, it comprises the mechanism that impels needle retractable in a controlled manner.

The present invention is directed to the another kind of broad form of retractable syringe, it has the device that prevents the unexpected retraction of syringe needle.

The present invention is directed to another broad form of retractable syringe, no matter in assembling still in use, but it does not all need the alignment between retractable needles and the plunger to impel needle retractable.

In first aspect, the invention provides the plunger that is used for retractable syringe, but this syringe has syringe and retractable needles seat, this needle holder is equipped with maybe can install syringe needle, but but described plunger comprises the dismountable control device that is used to engage the device of described retractable needles seat and is used for promoting the retraction speed control of described retractable needles seat with described plug engages the time.

In second aspect, retractable syringe has syringe; But the retractable needles seat, this needle holder is equipped with maybe can install syringe needle; And plunger, but this plunger comprises the device that is used to engage described retractable needles seat and detachable control device, but to be used for described plug engages the time, promoting the retraction speed control of described retractable needles seat.

In the third aspect, the invention provides the method that a kind of operation has the retractable syringe of syringe; But the retractable needles seat, this needle holder is equipped with maybe can install syringe needle; And plunger, this plunger comprises the device that is used to engage described retractable needles seat and detachable control device, this method comprises the step of operating described detachable control device, but with described plug engages the time, to control the retraction speed of described retractable needles seat.

In fourth aspect, the invention provides a kind of method of making as described plunger of front several respects or syringe, wherein said plunger inserts described syringe, but and the retractable needles seat alignment that does not make described plunger and engage.

Rightly, plunger comprises plunger seal pad (seal), plunger shell and plunger part.

Preferably, described plunger seal padding body forms or contacts with described plunger shell, for example by mold insert molding on described plunger shell (insert moulding).

Typically, integrally formed plunger seal pad especially is suitable for " refilling type (fill-able) " syringe (rather than pre-filled (pre-filled) syringe), because it provides simpler and method at a low price for making and assemble described retractable syringe, enough sealing effectiveness have been kept simultaneously.

Preferably, plunger also comprises bias unit, and in use described plunger shell and described plunger part combined effect are to remain on initial compressed state with described bias unit releasedly.

Described bias unit is spring, elasticity or other compressible and can reduce pressure structures.

Preferably, described bias unit is a spring.

In a preferred form, retractable syringe also comprises bracing or strutting arrangement, thereby but its engage with described needle holder releasedly and prevent retractable needles seat retraction during plunger withdrawal.

In one embodiment, bracing or strutting arrangement comprises that integral body is formed at the propclip in the described syringe.

In another embodiment, bracing or strutting arrangement comprises propclip in being installed to the lid of described syringe.

Suitably, syringe also comprises injection apparatus (ejector means), and it operationally discharges the described bracing or strutting arrangement that engages with described needle holder, thereby allows the retraction of described needle holder.

In a preferred embodiment, in the use, after described plunger part engages described needle holder, the decompression that separately is beneficial to described spring of described plunger shell and described plunger part, thereby when described spring engaged with described plunger part and described needle holder, the decompression of described spring made described plunger part and described needle holder bounce back.

Suitably, but plunger also be included in before the described retractable needles seat retraction, be used for described control device is releasably connected to the holding device of described plunger shell.

Preferably, using method is included in the step of retraction end back from plunger dismounting control assembly.

In a preferred form, described control device is a control stick.

In this description, except as otherwise noted, " comprising ", " comprising " and " containing " are opening rather than exclusive, and therefore the integer or the integer group of statement can comprise one or more integers that other are not stated or integer group.

Description of drawings

With the accompanying drawing is with reference to description non-limiting example of the present invention, wherein:

Fig. 1 is the cutaway view of the embodiment of retractable syringe;

Fig. 2 is the side sectional view of the embodiment of plunger, has shown the compression spring between preceding plunger part of retraction and the plunger shell;

Fig. 3 is the side sectional view of the embodiment of plunger, has shown the plunger rod that engages with latch in the preceding plunger shell of plunger rod retraction;

Fig. 4 is the vertical view of plunger part, has shown the needle holder engagement device;

Fig. 5 is the side sectional view of the embodiment of needle holder, seal member and injection apparatus;

Fig. 6 is the cutaway view of syringe, has shown the needle holder that engages before the retraction;

Fig. 7 is the plunger cutaway view, and this plunger engages with needle holder before retraction;

During Fig. 8 is needle holder, plunger part and plunger rod retraction, the side sectional view of retractable syringe;

After Fig. 9 is retraction, has the side view of the retractable syringe of the control stick that is disengaged;

Figure 10 is the cutaway view of the embodiment of retractable syringe, has shown the lid that is installed on the syringe;

Figure 11 is the side sectional view of the embodiment of syringe lid, needle holder and seal member;

Figure 12 is the vertical view cutaway drawing of the embodiment of syringe lid;

Figure 13 is the inner side view of lid;

Figure 14 is the axonometric chart of the alternate embodiment of syringe needle and needle holder;

Figure 15 is the axonometric chart of the alternate embodiment of syringe needle, needle holder and seal member;

Figure 16 is the axonometric chart of the alternate embodiment of syringe, and this syringe comprises integrally formed bracing or strutting arrangement; And

Figure 17 is the cutaway view of the alternate embodiment of plunger.

The specific embodiment

With reference to figure 1,retractable syringe 10 comprisesplunger 20 and syringe 30.Syringe 30 comprisesplunger end 31,needle end 32,inwall 33 and is positioned at dactylostyle (finger grip) 34A, the 34B of plunger end 31.In theneedle end 32 ofsyringe 30, but theretractable needles seat 40 withsyringe needle 11 is installed, thissyringe needle 11 comprises hollow needle mounted thereto (cannula) 12, and is assemblied in theseal member 50 in thecircumferential groove 39 in theinwall 33.

Plunger 20 can axially-movable in thefluid space 500 ofsyringe 30, and it comprisesplunger shell 21,control stick 70 and theplunger part 80 with plunger seal pad 22.Control stick 70 hasbutton 71, andbutton 71 is operated by user, and is assemblied in thelatch 28 of going in ring, and thisbelt latch 28 is assemblied in theinward flange 299 ofplunger shell 21, as shown in Figure 3.

More obvious among Fig. 2,plunger shell 21 is hollow basically, comprises inwall 23 and the cervical region 24 with inner periphery shoulder 25A,25B.Plunger part 80 comprises excircle lug (ledge) 81A, 81B and has the inner chamber 82 of ring 83 that ring 83 receives also theadditional piece 72 ofEngagement Control bar 70 releasedly.

Plunger seal pad 22 integral body form or contact withplunger shell 21, preferably by mold insert molding inplunger shell 21, thereby the seat 27 ofplunger seal pad 22 is sealed on the cervical region 24 ofplunger shell 21, and bear againstplunger part 80 at intersection 26, the fluid-tight between theinwall 33 of plunger seal parts 222A, 222B andsyringe 30 also is provided simultaneously.

Compression spring 60 is installed on theplunger part 80, is supported between the inner periphery shoulder 25B of inwall 23 of theexcircle lug 81B ofplunger part 80 and plunger shell 21.Theexcircle lug 81A ofplunger part 80 bears against the inner periphery shoulder 25A ofplunger shell 21, thereby keeps releasable joint betweenplunger shell 21 and plungerpart 80.

As shown in Figure 3, by bearing against thealligator clamp 75 at theinner periphery shoulder 29 of thelatch 28 of going in ring, thebutton 71 ofplunger rod 70 engages withbelt latch 28 at first.Thelatch 28 of going in ring is assemblied in theinward flange 299 ofplunger shell 21, thereby preventsplunger rod 70 from 21 unexpected the disengagings and retraction of plunger shell, and therefore, the spring driving retraction up to plungerrod 70 all needs plungerpart 80 always.

With reference to figure 4,plunger part 80 also comprises needleholder engagement device 84, and this needleholder engagement device 84 comprises a plurality ofprotrusion member 85A, 85B, 85C that separated bygap 87A, 87B,87C.Protrusion member 85A, 85B, 85C are formed by elastomeric material, thereby can do the radially inwardly motion shown in solid arrow.

With reference to figure 5,needle holder 40 comprises themain body 42 of (the luer mount) 41 that have Rule seat,Rule seat 41 has lockingscrew thread 43 andmedium pore 44, and thismedium pore 44 allows to be installed in the fluid communication between the flowing material of syringe needle 11 (not shown among Fig. 5) onRule seat 41 andsyringe 30.

In an alternate embodiment,Rule seat 41 can be no screw thread female Luer (luerslip) (not shown) form, as known in the art.

In another alternate embodiment, the present invention is contemplated that the retraction offixed needle 11 rather than the retraction of thesyringe needle 11 that can removably install, will more specifically describe hereinafter.

Themedium pore 44 ofneedle holder 40 is communicated with thefit 45 of the needleholder engagement device 84 that holdsplunger 20, is beneficial to the retraction ofneedle holder 40 and the syringe needle that engages.

Needle mount body 42 also comprisestoothed edge 46, and it comprises a plurality oftooth 47A to 47L and needle holder matrix 49.

Seal member 50 comprises sealingmatrix 51, and thismatrix 51 comprises sealing ribs 56A, the 56B that is separated bywaist 55, the injection apparatus 52 and theneedle holder passage 54 of taper anchor ring 53 forms.

Seal member 50 is assemblied in around the needle holder matrix 49.

With reference to figure 6, thecircumferential groove 39 ofsyringe 30 is assemblied in thewaist 55 ofseal member 50, to prevent thatseal member 50 is by in theindentation syringe 30.

Clearly, thetooth 47A to 47L of thetoothed edge 46 ofneedle mount body 42 presss from bothsides 35A to 35F with the guiding in thesyringe 30 and interacts, and is beneficial to the location ofneedle holder 40 in theneedle end 32 ofsyringe 30 in Fig. 6.Each guiding folder 35 has guiding tooth 37, and in assembling process, by engaging contiguous tooth 47, this guiding tooth 37 helpsneedle holder 40 to be fitted into theneedle end 32 of syringe 30.In Fig. 5 and example shown in Figure 6, thetooth 37A oftooth 47A, 47B and guidingfolder 35A interacts, andtooth 47E, 47F and thetooth 37C of guidingfolder 35C interact, although be interpreted as any a pair of adjacent tooth 47 can with any guiding folder 35 interactions.

When additional screw thread syringe needle was installed to Ruleseat 41 by lockingscrew thread 43, this layout had also prevented the rotation ofneedle holder 40.

Theneedle end 32 ofsyringe 30 also comprisespropclip 36A to 36F, thedownside 48 of thetoothed edge 46 of itsjoint pin headstock 40, and prevent thatneedle holder 40 is before retraction in the unexpected retraction syringe 30.Propclip 36A, 36D are as shown in Figure 6.Propclip 36A to 36D is suitably formed by the material of elastically deformable, thereby propclip 36A to 36D can from the engaging ofneedle holder 40 discharge, to such an extent as to but be out of shape not too large before retraction in the retraction process ofplunger 20propclip 36A to 36D unexpectedly break away from and the engaging ofneedle holder 40.

With reference to figure 7 and Fig. 8, in use the order of occurrence of each incident is as described below.

Though be not exclusiveness ground,syringe 10 typically can discharge 3 or 5 milliliters of Fluid Volumes.Therebyplunger part 80joint pin headstock 40 unexpectedly not before the retraction,syringe 30 have enough volumes with allowplunger 20 retractions with near the initial position ofneedle holder 40plunger end 31 of syringe 30 (promptly towards) with fluid filled tosyringe 30.

In case fill, realize the injection of the flowing material ofsyringe 30 bycompression plunger 20.

For fromfluid space 500 releasefluids compression plungers 20 when finishing, theadditional fit 45 of needleholder engagement device 84 snap lock (snap-lock) thejoint pin headstock 40 ofplunger part 80, thus connectneedle holder 40 and plunger part 80.This be by with thedevice 84 needle holder that engageprotrusion member 85A, 85B, 85C can radially inwardly be moved intogap 87A, 87B, 87C (shown in filled arrows among Fig. 4) realizes, replenish fit 45 thereby be beneficial to enter and engage, as shown in Figure 7.

Continuecompression plunger 20 by the filled arrows direction in Fig. 7, by being connected to theplunger seal pad 22 of theplunger shell 21 that bears against sealingmatrix 51, the taper injection apparatus 52 ofseal member 50 is pushed to theneedle end 32 of syringe 30.Whenplunger part 80 linked to each other also stop motion temporarily withneedle holder 40,plunger seal pad 22 andplunger shell 21 continued to move along this direction.

Seal member 50 and taper injection apparatus 52 allow injection apparatus 52 to makepropclip 36A to 36F radially outward move (shown in filled arrows among Fig. 6) and are disengaged with thedownside 48 of thetoothed edge 46 ofneedle holder 40 to the persistent movement of theneedle end 32 ofsyringe 30, thereby theneedle end 32 ofneedle holder 40 fromsyringe 30 discharged, and thisneedle holder 40 is connected to plungerpart 80 as previously described.

Continuecontinuous compression plunger 20 gently,plunger part 80 is disengaged with plunger shell 21.This excircle lug 81A inner periphery shoulder 25A from the cervical region 24 ofplunger shell 21 byplunger part 80 breaks away from and connects, and realizes with the joint that discharges betweenplunger shell 21 and theplunger part 80.

Thereby this disengaging makes theexcircle lug 81B ofspring 60 decompressionbackup plunger parts 80, thereby direction of arrowretraction plunger part 80 and theneedle holder 40 that is connected withplunger part 80 inplunger shell 21 keepsseal member 50 andplunger seal pad 22 static simultaneously in Fig. 8.Equally,spring 60 times, thus being disengaged along theinner periphery shoulder 29 that the direction of arrow shown in Fig. 3 moves with latch byalligator clamp 75, thelatch 28 of pressure control stick 70 from be assemblied inplunger shell 21 breaks away from.Like this,plunger rod 70 retractions, retraction speed is by user applied pressure (for example by the thumb pressurization) control oncontrol knob 71.

As thelug 81B ofplunger part 80 during in abutting connection withlatch 28, retraction finishes.

Plunger shell 21,plunger seal pad 22 andseal member 50 do not bounce back, and remain on theneedle end 32 ofsyringe 30.

As shown in Figure 9, can manually controlstick 70 be dismantled fromsyringe 10 then.Control stick 70 can be used as " cleaning " rubbish and abandons, and stays thesyringe 10 that remnants in thesyringe 30 haveplunger shell 21,plunger seal pad 22 andseal member 50, to handle through medical waste more closely.

Figure 10 to 13 has shown alternate embodiment, and whereinretractable syringe 110 comprisesplunger 120 and syringe 130.Syringe 130 comprisesplunger end 131,needle end 132,inwall 133 and is positioned at dactylostyle 134A, the 134B of plunger end 131.In theneedle end 131 ofsyringe 130, but theretractable needles seat 140 with syringe needle 111 is installed, thissyringe needle 11 comprises hollow needle 112,lid 190 andseal member 150.

Plunger part 180 comprises needleholder engagement device 184, and this needleholder engagement device 184 comprisesprotrusion member 185A, the 185B that is separated by gap orspace 187, the fit 145 that it canjoint pin headstock 140.

But describe in more detail with reference to Figure 11 and to cover 190retractable needles seats 140 andseal member 150.

Lid 190 compriseslid 191,matrix limit 192,lid 193 and hole, Rule (lueraperture) 194.Lid 191 comprises and separately propclip 196A, 196B,space 195A, the 195B of 196C associated,195C.Space 195B, the 195C ofpropclip 196B, 196C and correspondence are invisible in Figure 11, but can be more clearly visible in Figure 12 and Figure 13.

Refer again to Figure 11,needle holder 140 comprises themain body 142 withRule seat 141, thisRule seat 141 has lockingscrew thread 143 andmedium pore 144, and thismedium pore 144 allows to be installed in the syringe needle (not shown) ofRule seat 141 and the flowing material ofsyringe 130 carries out fluid communication.In an alternative embodiment,Rule seat 141 can be the form of no screw thread female Luer (not shown), as known in the art.

Medium pore 144 is communicated with the fit 145 of the needleholder engagement device 184 that holdsplunger 120, is beneficial to the retraction ofneedle holder 140 and the syringe needle that engages, as previously described.

Needle mount body 142 also comprisestoothed edge 146 andneedle holder matrix 149, and thistoothed edge 146 comprises a plurality ofteeth 147 andlimit downside 148.

Seal member 150 comprises theinjection apparatus 152 of sealingmatrix 151 andtaper anchor ring 153 forms, andneedle holder opening 154.

Seal member 150 is assemblied in around theneedle holder matrix 149, and part is inlid 190 inside, and thislid 190 is installed on theneedle mount body 142, therebyseat 141 outstanding passing in Rule are covered 190 hole,Rule 194.

According to present embodiment, provide and comprised and cover 190propclip 196A, 196B, the bracing or strutting arrangement of 196C, inwardly the location is with thedownside 148 of adjacencytoothed edge 146, therebyneedle holder 140 is towardsplunger end 131 motions ofsyringe 130 when preventing that plunger is drawn back insyringe 110 filling processs.

Lid 190propclip 196A, 196B, 196C can radial and outward deformation, shown in filled arrows among Figure 13, so thatneedle holder 140 discharges.

Thetooth 147 of thetoothed edge 146 ofneedle mount body 141 interacts belowlid 190 withcomplementary teeth 197A, 197B, 197C, as shown in figure 12, thereby is replenishing the rotation that preventsneedle holder 140 when the screw thread syringe needle is installed to Ruleseat 141 by lockingscrew thread 143.

As previously mentioned, after theplunger part 180joint pin headstocks 140, continuecompression plunger 120 and thetaper injection apparatus 152 ofseal member 150 is pushed to theneedle end 132 ofsyringe 130, so thatinjection apparatus 152 impels axially outwards motion (shown in filled arrows among Figure 13) ofpropclip 196A, 196B, 196C, and be disengaged with thedownside 148 of thetoothed edge 146 ofneedle holder 140, thereby discharge theneedle holder 140 that is connected withplunger part 180, as previously described.

It is as mentioned below in essence that the decompression ofspring 160 andneedle holder 140 and its are gone up the controlled retraction of syringe needle 111 of installation.

Though be not exclusiveness ground, aforementioned preferred embodiments typically relates toretractable syringe 10, whereinsyringe needle 11 can be installed toneedle holder 40 by female Luer or female Luer (luer lock).

Figure 14 to Figure 17 has shown the alternate embodiment with fixationhollow pin 211.

According to this embodiment, especially with reference to Figure 14,hollow needle 211 is bonded to or co-molded (co-moulded) in needle holder 240.Needle holder 240 comprises plug engagesdevice 245A, the 245B ofmain body 242,matrix 249 and barb-like form withlimit 246.

With reference now to Figure 15,,injection apparatus 252 co-molded are on seal member 250.Seal member 250 is used for sealing the inwall 233 ofsyringe 230 by sealingribs 256A, the 256B that is separated bywaist 255 and is used for sealingneedle holder 240 on the matrix 249.The advantage of this layout is that fixedneedle 211 typically has the diameter littler than female Luer or femaleLuer needle holder 240, has therefore reduced the integral diameter ofsyringe 210.

With reference now to Figure 16,, in theneedle end 232 ofsyringe 230, bracing or strutting arrangement comprises the propclip in a plurality ofcollars 239 that are overmolded to syringe 230.Propclip 236A, 236B, 236C, 236Djoint pin headstock 240 are to preventneedle holder 240 unexpected retractions when drawing backplunger 220 and thinksyringe 210 fillfluids.Guiding folder 235A, 235B, 235C, 235D global formation in thesyringe collar 239 ofsyringe 230, and each guiding folder 235 has lug 237, in assembling, this flange 237 promotes thatneedle holder 240 is fitted into theneedle end 232 ofsyringe 230, and prevents themobile needle end 232 that exceeds of needle mount body by thelimit 246 ofjoint pin headstock 240.

According to this embodiment, especially with reference to Figure 17,plunger 220 comprisesplunger shell 221,plunger part 280 and plunger seal pad 222.Plunger seal pad 222 co-molded and comprise sealingribs 2222A, 2222B onplunger shell 221.

Needleholder engagement device 284 is the grooves in theplunger part 280, andbarb 245A, 245B that it is suitable for holdingneedle holder 240 are beneficial to the retraction ofneedle holder 240, as previously mentioned.

Theseat 227 ofplunger seal pad 222 is sealed on thecervical region 224 ofplunger shell 221, and bears againstplunger part 280 atintersection 226, also provides fluid-tight betweenplunger seal parts 2222A, 2222B andsyringe 230 simultaneously.

Thespring 260 of compression is installed on theplunger part 280, is supported between theinner periphery shoulder 225B ofinwall 223 of excircle lug 28 1B ofplunger part 280 and plunger shell 221.The excircle lug 281A ofplunger part 280 bears against theinner periphery shoulder 225A ofplunger shell 221, thereby keeps releasable joint betweenplunger shell 221 andplunger part 280.

Yet in specific embodiment, thecircumference lug 281A ofplunger part 280 and/or theinternal lobes 225A ofplunger shell 221 can for example be comprised two, three, four, five or six circular segment by segmentation.Preferably, every section can have identical length.

Expect that this segmentation layout can provide interference fit more closely, even thereby have the tolerance variation that often occurs in the injection molding, connect the compression that also enough can keepspring 260 by force, connect but need less power that plungerpart 280 is broken away from fromplunger shell 221, therefore makespring 260 can reduce pressure and be beneficial to the retraction ofneedle holder 240 andhollow needle 21.

According to noted earlier, should be appreciated that and the invention provides simple, durable and cheap relatively retractable syringe, it does not need the auxiliary of user or needs the auxiliary of user to scrap automatically hardly, therefore prevents or has reduced the reusable probability of syringe at least.

In addition, the speed by the control needle retractable has reduced the probability that blood splashes, thereby has improved " user friendly " of retractable syringe.

The special advantage of retractable syringe of the present invention is, plunger does not need to rotate to needle holder and aligns to allow the retraction of needle holder.

In addition, injection apparatus is symmetric, does not therefore need to align to realize the release of needle holder with propclip.

Therefore, need not the location and greatly simplified manufacturing, thereby reduced the manufacturing cost and the selling price of syringe.

In whole description, purpose is to describe the preferred embodiments of the present invention, and does not limit the present invention in the particular combinations of any one embodiment or feature.Do not deviating under the prerequisite of the present invention, can make various changes and modification the embodiment that describes and illustrate.

Claims (22)

1. plunger that is used for retractable syringe, but this syringe has syringe and retractable needles seat, this needle holder is equipped with maybe can install syringe needle, but but dismountable control device that described plunger comprises device, the integrally formed plunger seal pad that is used to engage described retractable needles seat and be used for promoting the retraction speed control of described retractable needles seat with described plug engages the time.

2. plunger as claimed in claim 1, described plunger further comprises bias unit, plunger shell and plunger part, plunger shell and plunger part combined effect remain on initial compressed state with described bias unit releasedly.

3. plunger as claimed in claim 2, wherein plunger seal pad and described plunger shell are whole forms.

4. plunger as claimed in claim 3, wherein plunger seal pad mold insert molding in described plunger shell.

5. plunger as claimed in claim 2 arranges that this plunger makes described plunger part allow the decompression of described bias unit from the release of described shell, with when described plunger part joins described needle holder to, but promotes the retraction of described retractable needles.

6. plunger as claimed in claim 5, but further comprise the holding device that is used for before described retractable needles seat retraction, releasedly described control device being connected to described plunger shell.

7. plunger as claimed in claim 6 is arranged that this plunger makes the decompression of described bias unit impel described holding device to be disengaged, thereby is allowed described control device to discharge from described plunger shell.

8. plunger as claimed in claim 7, wherein said control device is a control stick.

9. plunger as claimed in claim 7, wherein said bias unit is a spring.

10. plunger that is used for retractable syringe, but this syringe has syringe and retractable needles seat, this needle holder is equipped with maybe can install syringe needle, described plunger comprises plunger shell, plunger part and spring, described plunger shell and plunger part combined effect are so that described spring remains on initial compressive state, but described plunger part comprises the device that is used to engage described retractable needles seat, but integrally formed plunger seal pad and the dismountable control device that is used for the retraction speed control of the described retractable needles seat of promotion with described plug engages the time, but described plunger further comprises the holding device that is used for releasedly described control device being connected to described plunger shell before described retractable needles seat retraction.

11. a retractable syringe has syringe; But the retractable needles seat that syringe needle maybe can be installed is installed; And plunger, but but dismountable control device that this plunger comprises device, the integrally formed plunger seal pad that is used to engage described retractable needles seat and be used for promoting the retraction speed control of described retractable needles seat with described plug engages the time.

12. retractable syringe as claimed in claim 11, described plunger further comprises bias unit, plunger shell and plunger part, and plunger shell and plunger part combined effect are to remain on initial compressed state with described bias unit releasedly.

13. retractable syringe as claimed in claim 12, wherein plunger seal pad and described plunger shell are whole forms.

14. retractable syringe as claimed in claim 13, wherein plunger seal pad mold insert molding in described plunger shell.

15. retractable syringe as claimed in claim 12 further comprises bracing or strutting arrangement, this bracing or strutting arrangement engages described needle holder releasedly, thereby but prevents the retraction of retractable needles seat in plunger withdrawal process.

16. retractable syringe as claimed in claim 15, wherein said bracing or strutting arrangement comprise that integral body is formed at the propclip in the described syringe.

17. retractable syringe as claimed in claim 15, wherein said bracing or strutting arrangement comprises propclip in being installed to the lid of described syringe.

18. retractable syringe as claimed in claim 15, wherein said syringe further comprises injection apparatus, this injection apparatus operationally make described bracing or strutting arrangement from the engaging of described needle holder discharge, thereby allow the retraction of described needle holder.

19. retractable syringe as claimed in claim 18, arrange this retractable syringe so that the release of described plunger part from described shell makes described bias unit reduce pressure, but when described plunger part joins described needle holder to, to impel the retraction of described retractable needles.

20. retractable syringe as claimed in claim 12, but further comprise the holding device that is used for before described retractable needles seat retraction, releasedly described control device being connected to described plunger shell.

21. retractable syringe as claimed in claim 20 is arranged that this retractable syringe makes the decompression of described bias unit impel described holding device to be disengaged, thereby is allowed described control device to discharge from described plunger shell.

22. a retractable syringe comprises syringe, but the retractable needles seat that syringe needle maybe can be installed is installed; Plunger, this plunger comprises plunger shell, plunger part and spring, described plunger shell and described plunger part combined effect are so that described spring remains on initial compressed state; Bracing or strutting arrangement, it engages described needle holder releasedly, thereby but prevent the retraction of retractable needles seat in the process of withdrawal plunger; And injection apparatus, its operationally make described bracing or strutting arrangement from the engaging of described needle holder discharge, thereby allow the retraction of described needle holder; But but dismountable control device that described plunger part comprises device, the integrally formed plunger seal pad that is used to engage described retractable needles seat and be used for promoting the retraction speed control of described retractable needles seat with described plug engages the time, but described plunger further comprises the holding device that is used for releasedly described control device being connected to described plunger shell before described retractable needles seat retraction.

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