WO2001007106A1

WO2001007106A1 - Safety syringe

Info

Publication number: WO2001007106A1
Application number: PCT/EP2000/007249
Authority: WO
Inventors: Young Chul Bang
Original assignee: Medi Plus Tec Medizinisch-Technische Handelsgesel Lschaft Mbh
Priority date: 1999-07-27
Filing date: 2000-07-27
Publication date: 2001-02-01
Also published as: AU6987600A; KR200166124Y1; JP2003505161A; ZA200201502B; WO2001007106A9; EP1206298A1

Abstract

The invention provides a safety syringe, which has a cylinder (11), a syringe needle (21), a needle holder (31) associated to the cylinder and adapted to hold the syringe needle, and a plunger (41) associated to the cylinder (11), wherein the plunger (41) comprises a piston (42) and serves to inject a filling of the cylinder (11) via the syringe needle (21), and wherein the plunger (41) can be coupled with the needle holder (31) arranged in the region of a front hole (12) of the cylinder (11), to retract the needle holder (31) together with syringe needle (21) into the cylinder (11) by pulling the plunger (41).

Description

SAFETY SYRINGE

This invention relates to a safety syringe, which has a cylinder, a syringe needle, a needle holder associated to the cylinder and adapted to hold the syringe needle, and a plungerassociated to the cylinder, wherein the plunger comprises a piston and serves to inject a filling of the cylinder via the syringe needle.

The invention provides a syringe having the features of claim 1 . For particular high safety, the features of claim 2 are suggested. Advantages with respect to the safefty are also obtained for the features of claim 3 or - alternatively - of claim 4. Substantial advantages are further obtained from the features of at least one of claims 5 to 8, which concern the coupling of the plunger with the needle holder and the fixation of the needle holter to the cylinder in the region of a front hole of the cylinder. Other possible features of a syringe according to the invention, which give further advantages, can be found in the following specification or/and in the figures.

A first embodiment, which serves to illustrate a syringe according to a first aspect of the invention, is shown in figures 1 to 1 1 . The figures show:

Hg. 1; Cross-sectional view of the parts.

Fig. 2; Squint -view of the parts.

Fig. 3; Lateral view of the cylinder.

Fig. 4; Lateral view of -the syringe needle inserter.

Fig, 5; Front view of the syringe needle iπseter.

Fig. 6; A-A line cross-sectional view of ike Fig. 5.

Fig, 7; B-B line cross-sectfonal iew of the Kg. 5.

Fig. 8; Piαrrt view of the plunger.

Hg. 9; Cross-sectional view of this device when injection is completed.

Fig-10; Cross-sectional view of -the device when plunger meets the syringe needle fixer upon completion of injection.

Fig.ll; Cross-sectional view of ϋύs device which, shows the breaking of tiae plunger after pulling inε plunger back into the cylinder in order to keep t the syringe needle an the syrmge needle fixer inside the cylinder. A second embodiment, which serves to illustrate a syringe according to a second aspect of the invention, is shown in figures 1 2 to 25. The figures show:

FIGURE <fø -A PARTIAL LONGITUDINAL CROSS-SECTION OF THE SYRINGE

FIGURE O -AN ISOMETRIC EXPLODED VIEW OF A NEEDLE INSERTING DEVICE

FIGURE -A VIEW OF THE PLUNGER

FIGURE IS -A LONGITUDINAL CROSS-SECTION OF THE SYRINGE WTTHOUT

NEEDLE FIGURE -76 -A LONGITUDINAL CROSS-SECTION OF THE SYRINGE WFTHOUT

NEEDLE THAT THE PLUNGER IS ASSEMBLED WITH THE NEEDLE

NEEDLE INSERTING DEVICE FIGURE 1 -A PARTIAL CROSS-SECTION SHOWS BREAKING OFF

THE PLUNGER AFTER INJECTION FIGURE ^ -A LONGITUDINAL CROSS-SECTION OF THE SYRINGE COVERED

WITH A PART SEPARATED FROM THE PLUNGER FIGURE 9 -A LONGITUDINAL VIEW OF THE NEEDLE INSERTING DEVICE

FIGURE 0 -A A-A LINE CROSS-SECTION IN FIGURE 72

FIGURE. Il -A ANOTHER A-A LINE CROSS-SECTION IN FIGURE 7

FIGURE.2 -A B-B LINE CROSS-SECTION IN FIGURE ^

FIGURE 23 -A C-C LINE CROSS-SECTION IN FIGURE ^"7?

FIGURE D -A E-E LINE CROSS-SECTION IN FIGURE 11

FIGURE 2S^" -A F-F LINE CROSS-SECTION IN FIGURE ^

The first embodiment and/or the second embodiment serve to illustrate further aspects of the invention. ln the following, a safety syringe according to the first aspect and further aspects of the invention is explained.

This device is for a safety syringe preventing a third, person fro getting damaged by the used syringe needles. It is designed to keep the syringe needle hi cπstody α syringe cylinder once used so that a third person may not be pricked by the used needles The phmger shall then be broken after use in order to prevent from being used agaϊn.

In order to prevent repeated use of syringe neeldes by far, it is the coirent phenomenon that disposable syringes are predominantly being used. Such conventional disposable syringes have been technically designed to prevent to be reused.

The conventional disposable syringes are, bof ever, after being used, usπaliy or frequently being disposed or not properly dealt 'with the needles and thus a third person may be sasily pricked. Such problems of giving damages to a -third party have not beεa solved.

Because the syringe needles always have blood stain, in case medical workers including doctors and nurses as. well as a third party get pricfeed by an used syringe needles they ate very much, concerned of being infected by the disease of the patients (AIDS, hepatitis- etc) and such cases have been reported.

This device is a safety syringe system which prevents cfeease feom being infected to a third party via used syringe needles by looping it inside the syringe cylinder.

According to this device, the used needle does not need to be taken off from he syringe after use, but, instead, it is pulled into file cylinder to be fixed and kept in custody inside cylinder. And by doing fins, infections of disease to a third party by getting pricked can be prevented.

My previous patent application of this rtatnre regarding safety syringe system have been published on the Utility Model Announcement Korea Utϋiry Model No.91-4532 and Open Utility Model Public Neτvs Korea Utility Model No.96 3409.

Thϊs device is to introduce more advanced safety syringe system "which, Ls simpler in structure and more reliable in affect compared "with the above-said previous patent. Technical Target that this device pursue to acccmpEsh.

My previous safety syringe system published on the Utility Model Announcement

No-914532 and Open Utility Model Public News No.96-13409 was to have the needleset fixed to the plunger so that ^•&©■ syringe needle can be kept inside cylinder "when the plunger is pulled back.

The disposable syringe that I have patented as above had som defects requiring a host of parts and extreme preciseness whereby creating difficulties in manufacturing. This device has been developed instead. It is simpler in structure, easier in msnufactαring, has eliminated the possibility of mis-use and requires less number of parts

In the following it is referred to Fig. 1 to 1 1 .

Structure and action of the device.

It has cylinder for injection. Inside the cylinder are piston Hπ plunger. In a syringe Which the dead-end of the cylinder has a syringe needle usually affixed, cyϊϊnder(ll), syringe nee<De(21), syringe needle inserter(31) and plunger 41) are the parrs in structure. At the end of inserting hole of the cylinder are a host of projection(13) and incised grooves arranged alternately. On the inner fece of the cylinder are stopping sfll(15) and obstacle (hooking?) s21 at the rear end. At the center of the sy nge needle inserter(31) is the syringe needle fixez(32). On the outer føce(33) of barrel shaped syringe αoeάle 5xsr(32) are number of 'T¹ shaped groσves(34) for prqjεctions 13) to enter. Pa ring(35) is placed in its rear. Inside of the rear-end are projections prαπnnencc(36) on the top and bottom. Inside both of the up/down projections aforesaid is formed the obstacle(hoo ing) inside ring stopper(37). On tie tip of the pϊunger(41} -where piston(42) is inserted are top bottom conecting devicε(43) which have booking sDIs^*). On the both sides of the central ptojeciicm(44) are erected projctions(44'). At fee end of tie pϊuπger(41) where piston(42) is inserted forms a space(47). Pressing button (48) at die rea part of the plimger(41) has a. inserting roove^*). T e inserting groovers' i≤ for the cap(49) to be inserted to cover the inserting hole(12) of the cylinder tip. In oredr for the plunger(41) to be easily broken, in the fore part of the plunger(4l) are marry "V" shaped grooves or holes and at the rear part of the p£stoo(42) of phmgεr(41) is formed a stopping ring siH(50).

Tins device with suck structure "will act as follows:

Cylinderfil) and tie syringe needle inserte*(31) are combined together by thrusting the needle inserter(31) from the rear end of the cylinder (11) to the inside of foe cylinder until the projections (13) on foe inner face of the cyl der(ll) insert hole(l2) meet and set in the "~ι ^π shaped grooves formed on the outer race of the barrel shaped needle insεrteτ(31).

Then the piston(42) inserted plungex(4l) is pushed into the rear side of the cylinderfil). ϊiight before the use of the syringe, syringe nce fle(2r) is fixed in the syringe needle inserter(31) as casual. Injection is sucked inio the cylϊnder(ll) by pulling the plunger backward. Injection is done to the patient by pushing the phmger(41).

At the time when the syringe needle iπscrter(31) is feed to the cylinderfil) from the rear toward inner side, it has to be pushed until the projections(13) of inserting hole(12) of the cylinder set in toward the circumference direction of the "^"i " shaped grooves of the syringe needle inserter(31)- At this time, the incised grooves between projectioπs(13) mil help syringe needle inserter 31) entering into the cyϋnder(ll) by making the cylinderfil) tip bursted open so that the needle inserter(31) can be easSy set in.

The stopping sϋl(lS) of the inner race of the cylinderfil) joints the rear tip of the syringe needle inserter(3I)- The packing(35) inserted in the syringe needle iπsε;rter(31) will closely adhere to the inner face of the cylinderfil),

When the syringe inserterf31) is inserted by force into the inserting hole(12) of the cylinder(ll) tip in order to fix the syringe needle inserter(31) onto die cylinder¹ s(l 1) tip, the projectiQns(13) of the far?"" face of foe cylϋnderø.1) will be hooked on any of foe ^{,, _}ι ^B shaped arooves (34) of the outer face of the syringe needle insεtsr(31), that is, on the groove of any location in circumference direction, but as the syringe needle inserter(31) turns accordingly when we trun and fix the syringe needle(21) in foe syring needle foseter(31), the projections (13) erected in foe inserting ho!e(12) of tie cylinderfil) will become to locate at the last of foe ^π_ι" shaped grooves as soon as the syringe needle is fixed in. Mσreover, as foe meeting places of foe "^*~ι " shaped grooves are not flat but are TJ" or ^πA" shaped, the projectάons(13) of cylinderfil) cannot be located on the border between the

ike this, the syringe needle inserter (31) and syringe needle are fixed at foe cyfinder(ll) tip, and by thrusting foe pk ge(41) into foe cylinderfil), syringe assembly is completed. The syringe sucks foe injection into foe cylinder ll) when the pltmger(4l) is pulled back. After plucking the needle(21) from the patiβntfRef Pig-9) upon completion of injection, if we apply force to push the ρlunger(41) forward (Ref.Hg.10), pistoιι(42) is being pressed so as for its volume to become smaller by foe space (47) formed inside of foe piston (42), and at foe same time, foe respective hooking sills(43') of upper and lower ccnnevting device(43) formed up and down the plunge(41) is inserted in foe obstacle ring sill (37) of

foe inner fece of the rear part syringe needle iaserterf31)₃ plungerf41) rip and foe syringe needle insεrter(31) rear part vptfl be combinde together. vhen foe plungcr(41) is tamed, foe projection (44¹) erected both, sides of the central projection (44) of foe plunger tip "will joint the tip/down projections(36) of the rear inner fece of the syringe needle mserterfSl). and foe truning ρlunge(41) will trun the syringe needle inserter(31).

The syringe needle inserter (31) winch is truned by foe plunger (41) is again turning the "^{~ π} shaped grooves (34), foen foe projections(13) of foe cyEnderfll) -will turn foe straight line of foe "^~i" shaped grooves(34). When foe ph ger is drawn back, foe projections fl3) ^■wfll be pushed forward along foe straight hues of ^{n ~}ιⁿ shaped grooves, and at foe same time, foe needle insεrter(31) as well as the syringe needle(21) vfiή x is inserted thereto will be pushed back to inside of cylinder(ll).

Backtracking plungerf41) will retreat until the plunger ring sill (40) reaches the hooking sill (16), foen plnnger (41) is to be broken. Then all foe operation comes to and end by trans-insextiig the cap(49) which is inserted in the pressing hole(48) into the inserting hole(12) in front. of foe cylinder(ll).

In the cap's(49) inserting hold is prepared a riπgf rcular) sill and because foe ring siH of foe cap(49) insert bole is to meet the projection(13)of the insert hole(12) of cylinder(l 1), foe cap inserted in foe insert bole(12) "would not easily come ouL Effect of this device.

This device is designed to withhold the used syringe needle inside foe cylinder, foe roam body of syringe, and whereby to prevent foe possible damages which may happen to medical workers including doctors and nurses as well as a third paty from being pricked by the used syringe needles,

The syringe needs to be dealt with, utmost care regardless before of after use, due to foe sharp*pointed needles. A special attention is required to be paid to foe used ones because of foe blood stain. Especially, because hepatitis and AIDS are infectious to a third party via blood stain, the syringes used ofr patients of such disease must be handled with special attention.

However, as described in this device, if we insert the used syrmge needle into foe cylinder and foen. break foe plunger, the syringe needle will be located inside the cylinder. If "we cover foe cylinder "with the cap prepared in foe rear of foe pfrmger, there is no possibility at all for foe syringe needle inside foe cylinder to be exposed out of the cylinder and can

be kept safely in custody until farther process. ff we use this device, we cannot re-use foe used syringes. Therefore, it is very useful device as it can prevent disease caused by the used syringe needles frame being infectious to a third person.

This device is designed to keep the used syringe needle inside the cylinder prohibiting re-use of foe used syrmge needles in order to prevent possible damages for medical woikεrs including doctors and nurses and a third party alike to be taken fio being pricked by the used syringe needles. The syringe needle which is fixed in foe syringe needle fixer is set at foe tip of cylinder with foe help of the syringe needle inserter.

Inserting part is composed at foe projection of foe tip of the plunger which is to be put m foe cylinder. At foe rear end of the syringe needle fixer is formed foe assembling part The projection of foe plunger joints the syringe needle fixer. When plunger is drawn back, syringe needle fixer with its needle fixed in will also be drawn back and kept inside the cylinder. Thus, damages by foe used syringe needle can be prevented. This device is of the safety syringe which can prevent in infectious diseases such as hepatitis and AIDS,

Some important aspects of the safety syringe according to the first embodiment are as follows:

It has cylinder to suck m injection. Piston and plunger are in foe cylinder while the ordinary syringe has foe syringe needle affixed to foe syringe, this device has foe cylinderfil), syringe needle l), syringe needle inserterβl) and plunger respectively as parts of its structure. At foe insert holeflό) of the above said cylinder (11) tip are a host of projections(13) and incased groovesfl4) arranged alternatively one after another. Cylinder's^ 1) it er fece has stopping sill and hooking sill in the rear. At the center of ^"foe syringe needle inserter is a syringe needle fixer to fix syringe needle. Outer barrel shaped outer fece of the syringe needle fixer has a number of "~T" shaped grooves for ptojections(13) formed on foe inner fece of foe insert hole(12) to set in. pac3ring(35) is set in the rear. On foe upper and lower part of the inner face of foe rear part are projections(36). Inside the upper and lower prqectionsflcT) is hooking ring sϋl(37} At the plungerf41) tip where piston is inserted in are top and bottom joints connecting device which has hooking sill(430- On both sides of foe central projection(44) inside foe top bσttom joint connecting device. Space (47) is formed at the plngeτ(41) tip where piston is inserted in. At foe pressing ushing button(48) of the rear end of foe ρlnnger(4ϊ) has foe insert roo ^¹). In foe insert groove(48 a cap(49) is supposed to be inserted to cover insert hole(12) of foe cylinder tip.

ln the following, a safety syringe according to the second aspect and further aspects of the invention is explained.

THIS DEVICE RELATES TO A SAFETY SYRINGE SO AS TO PREVENT A PRICKING OK OTHER PERSON BY MEANS OF WITHDRAWING A NEEDLE IN THE INSIDE OP A BARREL KEEHNG IN IT AFTER INJECTION AND THE REUSE OF A SYRINGE BY MEANS OF BREAKING OFF A PLUNGER

THE PRIOR SINGLE USE SYRINGE WHICH A TECHNICAL METHOD IS APPLIED TO IN ORDER TO PREVENT THE REUSE OF A USED SYRINGE WAS USUAL.

BUT THERE WAS THE POSSIBILITY OF PRICKING BY A USED NEEDLE BECAUSE THE PRIOR SINGLE USE SYRINGE IS LEFT OR THROWN AWAY, HOLDING THE NEEDLE ON THE SYRINGE. THUS THE PROBLEM THAT OTHER PERSON MIGHT BE DAMAGED WITH THE USED NEEDLE COULDN'T BE SOLVED BY THE SINGLE USE SYRINGE

THAT IS, SOME" BLOOD- IS LEFT ON THE NEEDLE AFTER INJECTION. IN THAT CASE, IF DOCTOR, NURSE, MEDICAL EMPLOYEE OR OTHER PERSON WAS PRICKED BY THE USED NEEDLE, THEY MIGHT BE INFECTED WITH THE DISEASE OF THE PAΩENT( SUCH AS AIDS, HEPATITIS AND THE LIKE) BY IT. THE EXAMPLES ARE ACTUALLY REPORTED,

THIS DEVICE RELATES TO THE SAFETY SYRINGE SO AS TO PREVENT TRANSMITTING THE INFECTIOUS DISEASES THROUGH THE USED NEEDLE. WITHDRAWING THE USED NEEDLE INTO THE INSIDE OF A BARREL AND KEEPING IT IN A BARREL WITHOUT REMOVAL OF THE NEEDLE, AFTER

INJECTION.

AS A PRIOR PATENT DOCUMENTS ON A SAFETY SYRINGE, THERE IS UTILITY MODEL ANNOUNCEMENT #91-4532 AND OPEN UTILITY MODEL ANNOUNCEMENT «96-13409 WHICH WERE APPLIED BY THIS APPLICANT AND WERE ANNOUNCED. AND ALSO THIS APPLICANT APPLIED FOR UTILITY MODEL OF A SAFETY SINGLE USE SYRINGE IN UTILITY MODEL APPLICATION #7783 IN 1999.

THIS DEVICE HAS MORE SIMPLE STRUCTURE AND EXACT FUNCTION THAN PRIOR SYRINGES WHICH WAS APPLIED BY THIS APPLICANT BEFORE. THE SAFETY SYRINGES THAT THE NEEDLE SET IS FIXED TO THE PLUNGER, WITHDRAWN INTO THE INSIDE OF A BARREL AND KEPT IN IT AFTER INJECTION ARE SHOWN IN UnLlTY MODEL ANNOUNCEMENT #91-4532, OPEN UTILITY MODEL #98-13409 AND UTπJTY MODEL APPLICATION #7783, WHICH WERE APPLIED BY THIS APPLICANT AND ANNOUNCED.

THE PRIOR SINGLE USE SYRINGES WHICH WERE APPLIED FOR UTILITY MODEL BY THIS APPLICANT HAD A PROBLEM IN MANUFACTURING BECAUSE THOSE NEED A GREAT NUMBER OF PARTS AND HIGH PRECISION. AS THIS DEVICE IS NEWLY DEVELOPED IN ORDER TO REMOVE THE DEMERITS, IT NEEDS FEW NUMBER OF PARTS, THE STRUCTURE IS SIMPLE, MANUFACTURING IS EASY AND THE POSSIBILITY OF THE INCORRECT OPERATION GETS REMOVED.

In the following it is referred to Fig. 1 2 to 25.

[STRUCTURE OP DEVICE]

SAME AS A GENERAL SYRINGE HAS A BARREL WHICH MEDICATION IS SUCKED INTO, A PISTON AND A PLUNGER IN THE INSIDE OF A BARREL.

THIS SAFETY SINGLE USE SYRINGE IS COMPOSED OF A BARRELUD, A NEEDL£(21X A PLUNGER(41) AND A NEEDLE INSERTING DEVICE(31) TO WHICH A NEEDLE(21) IS ATTACHED. A NUMBER OF PR0jECTIQNSα3) ARE IN THE INSIDE OF THE FRONT END OF AN INSERTING H0LEQ2) OF THE ABOVE BARREL(U), AN ANNULAR STOP PROMINENCE(15) IS ON THE INNER CIRCUMFERENTIAL SURFACE OP A BARREL0.1), AN ANNULAR RESTRAINING PROMINENCEQ6) IS AT THE REAR END OF A BARREL, A NEEDLE LOCKING DEVICE(32) TO ATTACH A NEEDLEC21) IS AT THE CENTER OF A NEEDLE INSERTING DEVICEGl A NUMBER OF 'i^* SHAPED FEMALE GROOVES(34) HAVING THE WIDE ENTRANCES IN ORDER TO BE ASSEMBLED WITH A PROJECπθN(13) LOCATED AT AN INNER SURFACE OP AN INSERTING HOLE(lZ) OF THE ABOVE CYLINDRICAL BARREL(ll) ARE ON THE OUTER CYIJNDRICAL SURFACE<33) OF A NEEDLE LOCKING DEVICE(32)₇ A 0-RINGQ5) IS INSERTED AT THE REAR OF THE GROOVES, A NUMBER OF FEMALE GROOVESQ7) ARE IN THE INSIDE OF A NEEDLE INSERTING DEVICE(36), A MALE EXTENSI NS(43) HAVING EACH RESTRAINING PROMINENCE<43') ARE AT THE FRONT END OF A PLUNGER( l) TO BE ASSEMBLED WITH A PBTON(42⁾, AN EMPTY SPACE(47 IS AT THE FRONT END OF A PLUNGER(41) TO BE ASSEMBLED WITH A PIST0N(42), A CUTTING NOTCH(45) IS AT THE FRONT PART OF A PLUNGER(41) IN ORDER TO BE EASILY BROKEN OFF, A ANNULAR STOP FROMINENCE<50) IS AT THE REAR PART OF A PLUNGER(41), REAR STOP PROJECTIONS^) ARE AT THE LCWGITUDINAL CENTER OF A PLUNGER, AN EMPTY SPACK53) IS LONGITUDINALLY IN THE CENTRAL INSIDE OOF A PLUNGER(41) BETWEEN REAR STOP PROJECTIONS (SD AND CUTTING NOTCH.

THE DEVICE HAVING THIS STRUCTURE OPERATES AS FOLLOWS.

A NEEDLE INSERTING DEV1CEC31) IS INSERTED INTO A BARREL FROM THE BACK END OF A BARREL(U) AND PUSHED TOWARDS THE FRONT END UNTIL A NUMBER OF FROJECTTONSU3) IN THE INSIDE OF A INSERTING HOLEQ2) OF A HARREL(ll) REACHES THE END OF "~ι⁴ SHAPED GROOVE<34) HAVING A WIDE ENTRANCE ON THE CYLINDRICAL OUTER SURFACE(33) OF A NEEDLE INSERTING DEVICEOi), AND ASSEMBLED WITH A BARREL(ll⁾.

AND THEN A PLUNGSR(41) ASSEMBLED WITH A PISTON(42) IS INSERTED INTO A BAHREL FROM THE BACK END OF A BARRΞL(U⁾ AND A NEEDLEC21) IS PUT INTO A NEEDLE INSERTING DEVICEOI) JUST BEFORE USING A SYRINGE. A PLUNGER( 1) IS PULLED BACK AND MEDICATION IS SUCKED INTO THE INSIDE OF A BAHREL(ll) AS USUAL. MEDICATION IS INJECTED INTO A PATIENT'S BODY, A PLUNGER(41) BEING PUSHED.

WHEN AN NEEDLE INSERTING DEVICEC31) IS INSERTED INTO A BARREL(ll) FROM THE BACK END OF A BAHRE 11) AND FDCED TO A BARREL, A NEEDLE INSERTING DEVICEOI) IS PUSHED INTO A BARREL UNTTL A NUMBER OF PROJECπCBSTS(l3) JN THE INSIDE OF AN INSERTING HOLEU2) OF A BARRELCtl) REACHES THE END OF THE ^M -ι" SHAPED GROOVE(34 HAVING THE WIDE ENTRANCE ON THE OUTER SURFACE OF A NEEDLE INSERTING DEVΪCE(3l>. IN THIS CASE A ANNULAR STOP FROMINENCEα5) ON THE INNER SURFACE OF A BARREL(ll) MEETS THE BACK END OF A NEEDLE INSERTING DEVICE(31) AND AN 0-RING<35) INSERTED INTO A NEEDLE INSERTING DEVICE(31) CLINGS TO THE INNER CYLINDRICAL SURFACE OF A BARREL(ll) SO THAT SEALING IS COMPLETELY KEPT, WHEN A NEEDLE INSERTING DEV1CE(3I) IS PUSHED INTO AN INSERTING HOLEQ2) AT THE S ONT END OF A BARRELQl) AND LOCKED, THE PROJECnONS(13) ON THE INNER CIRCUMFERENTIAL SURFACE OF A BARRΞL(ll) IS POSITIONED AT THE BACK END(THE ENTRANCE OF THE GROOVE) OF THE "i* SHAPED FEMALE GROOVE(3 ) HAVING THE WIDE ENTRANCE ON THE OUTER CIRCUMFERENTIAL SURFACE OF A NEEDLE INSERTING DEVICE(31). BUT WHEN A NEEDLΞ(21) IS PUT INTO A NEEDLE INSERTING DEVICEβl) AND LOCKED, THE MALE PROJECT20NSU3) IN THE INSIDE OF AN INSERTING HOLE(12) OF A BARREL0.1) IS POSITIONED AT THE END OF "M SHAPED FEMALE GROOVE(34) BECAUSE BOTH THE NEEDLE(21) AND THE NEEDLE INSERTING DEVICEC3D IS ROTATED TOGETHER.

THUS, A NEEDLE INSERTING DEVICEβl) AND A NEEDLE (21) IS AT THE FRONT END OF A BARREL(ll) AND A FLUNGERC41) IS INSERTED INTO A BARREL(11) SO THAT THE ASSEMBLY OF A SYRINGE IS FINISHED. THE PLUNGER(41) IS PULLED BACK, THE MEDICATION IS SUCKED INTO A BABREL AND FT IS INJECTED TO A PATENT'S BODY, AFTER MEDICATION IS INJECTED TO A BODY AND A NEEDLE(21⁾ IS WITHDRAWN FROM IT, AS ADDITIONAL FORCE IS APPLIED TO A PLUNGER (41) (FIGURE 5), A PISTON(42) WHICH HAS AN EMPTY SPACE(47) INSIDE IS PRESSED AND SQUEEZED. AT THE SAME TIME EACH RESTRAINING STOP PROJECTIONS' ) OF A LOCKING DEVICE<43) IS LOCKED IN THE INSIDE OF A FEMALE GROOVE(37) LOCATED AT THE OUTSIDE OF A CENTRAL HOLE OF A NEEDLE INSERTING DEV1CE(31) SO THAT THE FRONT END OF A PLUNGER(41) IS CONNECTED WITH THE BACK END OF A NEEDLE INSERTING DEVICES). THEREAFTER, IF A PLUNGER IS ROTATED, A NEEDLE INSERTING DEVΪCE(31) IS ROTATED TOGETHER BY rr.

THUS A "~!" SHAPED FEMALE GROOVE(34) ON THE OUTER SURFACE OF A NEEDLE INSERTING DEVICEC91) ROTATED BY A PLUNGERC41) IS ROTATED TOGETHER SO THAT PROJECTIONS (13) ON THE INNER ORCUMFERSNTIAL SURFACE OF THE FRONT END OF A BARREL(ll), WHICH ARE POSITIONED CmOJMFERENTIALLY IN A "i* SHAPED FEMALE GROOVE(34), ARE ROTATED UNTIL THE STRAIGHT LINE OF A "-?" SHAPED FEMALE GROOVE(34), AFTER THAT. WHEN A FLUNGEfi<41) IS PULLED BACK. PROJECTIONS Q3) IS MOVED FORWARD THROUGH THE STRAIGHT LINE OF A *-ι " SHAPED FEMALE. AND SIMULTANEOUSLY A NEEDLE INSERTING DEVICE<31> WITH AN ATTACHED NEEDLEC21) IS MOVED BACK INTO A BARRELOU AND KEPT INSIDE. A PLUNGER(41) IS MOVED BACKWARDS UNTIL AN PLUNGER ANNULAR PROMINENCES) REACHES AN RESTRAINING ANNULAR PR0MINENCE(16) OF A BARREL. AND THEN, A PLUNGER IS BROKEN OFF AT A CUTTING NOTCH(45). THUS THE BROKEN PLUNGER(42) IS INSERTED INTO A BARREL FROM THE FRONT END OF A BARREL. IN OTHER WORDS, A REAR RESTRAINING STOP PROJECTIONS) OF A PLUNGER(41) IS INSERTED UNTIL IT REACHES THE INSIDE OF A FROJΞCTTON(31) LOCATED IN THE INSIDE OF A FRONT INSERTING HOLE (12) OF A BARREL(ll). A PLUNGER<41) WHICH IS LOCKED IN AN INSERTING HOLE02) IS NOT PULLED BACK EASILY BECAUSE A REAR RESTRAINING STOP PROJECT10NS(51) IS ENGAGED WITH A PROJECTIONS) IN THE FRONT END OF A INSERTING HOLE.

CONSEQUENTLY, A NEEDLE INSERTING DEVlCEβl) INCLUDING A NEEDLE(21) IS THROUGHLY INSERTED INTO THE INSIDE OF A BARREL(ll). A NEEDLE STORED IN THE INSIDE OF A BARREL IS SAFELY KEPT IN BECAUSE A INSERTING HOLE(12) IS BLOCKED BY A BROKEN FLUNGER(41).

[EFFECT OF DEVICE] THIS DEVICE CAN PREVENT A PRICKING OF DOCTOR, NURSE AND OTHER MEDICAL EMPLOYEE BECAUSE A NEEDLE USED FOR A PATIENT IS INSERTED INTO THE INSIDE OF A BARREL AND KEPT IN.

A SYRINGE HAVING A SHARP NEEDLE SHOULD BE TREATED WITH MUCH CARE, WHETHER IT IS USED OR NOT. ESPECIALLY, IN CASE OF A BLOOD-STAINED NEEDLE USED FOR A PATIENT, IT SHOULD BE TREATED MOST CAREFULLY.

THE DISEASES SUCH AS HEPATITIS, AIDS AND THE LIKE CAN BE TRANSMITTED THROUGH BLOOD. THEREFORE, A NEEDLE USED FOR SUCH A PATIENT SHOULD BE HANDLED WITH UTMOST CASE.

THIS DEVICE HAS AN ADVANTAGE THAT A NEEDLE IS SAFELY KEPT IN A BARREL BECAUSE A PLUNGER IS BROKEN OFF AFTER A NEEDLE OF A SYRINGE IS THROUGHLY INSERTED INTO A BARREL. A BROKEN-OFF PLUNGER IS INSERTED INTO A BARREL THROUGH AN INSERTING HOLE. AN INSERTING HOLE IS BLOCKED WITH A BROKEN PLUNGER SO THAT A NEEDLE CAN BE KEPT IN AND TREATED SAFELY.

THUS THIS IS A USEFUL DEVICE WHICH MAKES A USED SYRINGE NOT TO BE REUSED AND PREVENTS INFECTIOUS DISEASES FROM SPREADING.

THIS RELATES TO A DEVICE FOR PREVENTING THAT DISPOSABLE SYRINGE IS REUSED AND THAT DOCTORS, NURSES, MEDICAL EMPLOYEES OR OTHERS ARE PRICKED BY THE USED NEEDLE BY MEANS OF INSERTING IT INTO A BARREL AFTER INJECTION. THE NEEDLE IS ATTACHE) TO THE FRONT OF A BARREL WITH A NEEDLE INSERTING DEVICE, AN INSERTING PART IS MADE ON MALE EXTENSIONS IN THE FRONT END OF THE PLUNGER WHICH IS INSERTED INTO A BARREL AND A CONNECTING PART IS MADE EN THE BACK END OF A NEEDLE INSERTING DEVICE. A MALE EXTENSION OF A PLUNGER IS ASSEMBLED WITH A NEEDLE LOCKING DEVICE AND A NEEDLE INSERTING DEVICE WHICH A NEEDLE IS ATTACHED TO IS INSERTED INTO A BARREL WHEN A PLUNGER IS PULLED BACK. A NEEDLE INSERTING DEVICE IS KEPT IN THE INSIDE OF A BARREL. THEREFORE. USER DOESN'T BE PRICKED BY THE USED NEEDLE. CONSEQUENTLY, THIS SAFETY SYRINGE CAN PREVENT INFECTIOUS DISEASES SUCH AS HEPATTTIS AND AIDS FROM SPREADING.

Some important aspects of the safety syringe according to the second embodiment are as follows:

THIS SAFETY SINGLE USE SYRINGE IS COMPOSED OF A BARREL(ll), A NEEDLE 21), A PLUNGER(41) AND A NEEDLE INSERTING DEVICE(3l), SAME AS A GENERAL SYRINGE WHICH HAS A BARREL INTO WHICH THE LIQUID MEDICINE IS SUCKED, A PISTON AND A PLUNGER INSIDE THE BARREL, AND A NEEDLE IS PUT ON THE FRONT TIP OF THE BARREL.

THERE IS A NUMBER OF PROJECTIONS(13) IN THE INSIDE OF THE FRONT END OF AN INSERTING HOLECI2) OF THE ABOVE BARREL(ll), THE CIRCULAR STOP PEOMINENCECLB) AT THE INNER SURFACE OF A BARREL(ll), A CIRCULAR RESTRAINING PROMINENCE(16) INSIDE THE REAR END OF A BARREL, A NEEDLE FIXING DEVICE⁽32⁾ TO INSERT A NEEDLE(21) AT THE CENTER OF A NEEDLE INSERTING DEVlCEβl), A NUMBER OF "i " SHAPED GROOVES(34) WITH THE WIDE ENTRANCES AT AN OUTER SURFACE(33) OF A CYLINDRICAL PART OF A NEEDLE FIXING DEVICE(32) IN ORDER TO BE ASSEMBLED WITH A PROJECTION(13) LOCATED AT AN INNER SURFACE OF AN INSERTING HOLEQ2) OF THE ABOVE CYLINDRICAL BARHEL(ll), A 0-RING<35) IN THE REAR OF THE GROOVES, A NUMBER OF THE INSERTING GROOVES (37), A CONNECTING DEVICE(43) OF UPPER AND LOWER PART WITH RESTRAINING PROMINENCES(43') AT THE FRONT END OF A PLUNGER(41) TO BE ASSEMBLED WITH A PlSTON(42), AN EMPTY PART(47) AT THE FRONT END OF A P JNGERtøl) TO BE ASSEMBLED WITH A PI5TON(42>, A CUTTING NOTCHC45) AT THE FRONT PART OF A PLUNGER(41) IN ORDER TO BE EASILY BROKEN OFF, A CIRCULAR STOP PROMINENCES) AT THE FRONT PART OF A PLUNGER( L) REACHING TO THE REAR OF A FISTON(42), A REAR STOP PROJECTIONS!) AT THE LONGITUDINAL CENTER OF A PLUNGER, AN EMPTY PART LONGITUDINALLY FROM A HEAR STOP PROJECTIONS⁾ TO A CUTTING NOTCH(4B) IN THE CENTRAL INSIDE OF A PLUNGER.

A relevant difference between the first and the second embodiment is as follows:

According to the first embodiment, the plunger (41 ) has a cap (49), which serves to close the front hole of the cylinder ( 1 1 ) after injection, i.e. after retraction of the needle (21 ) into the cylinder (cp. Fig. 1 0 and 1 1 ) .

According to the second emboldiment, a part of the plunger ( 1 1 ) itself serves (after breaking the plunger) to close the front hole of the cylinder ( 1 1 ) after injection, i.e. after retraction of the needle (21 ) into the cylinder. To close the front hole, the part of the plunger is inserted into the cylinder (cp. Fig. 1 6 and 1 8) . Accordingly, the costs for the manufacturing of the cap (e.g . the cost for providing a mold) are saved.

Besides this difference, the general structure and functioning of the first and second embodiment are more or less the same.

In the above specification, the terms barrel and cylinder are used as synonyms. The needle inserting device or needle inserter (31 ) may as well be termed needle holder.

Claims

■ . Safety syringe, having a cylinder (11; 11 ), a syringe needle (21 ; 21 ), a needle holder (31; 31) associated to the cylinder and adapted to hold the syringe needle, and a plunger (41; 41) associated to the cylinder (11; 11), wherein the plunger (41; 41) comprises a piston (42; 42) and serves to inject a filling of the cylinder (11; 11) via the syringe needle (21; 21), and wherein the plunger (41; 41) can be coupled with the needle holder (31; 31) arranged in the region of a front hole (12; 12)) of the cylinder (11; 11), to retract the needle holder (31; 31) together with syringe needle (21; 21) into the cylinder (11; 11) by pulling the plunger (41 ; 41 ).

2. Syringe according to claim 1, characterized in that the plunger (41; 41) has a predeterminded breaking point, to allow, that a re-use of the syringe can be inhibited by breaking the plunger (41; 41).

3. Syringe according to claim 1 or 2, characterized in that the plunger (41; 41) carries a cap (49), which can be inserted in the front hole (12) of the cylinder (11) after retraction of the syringe needle (21 ) into the cylinder (11).

4. Syringe according to claim 2, characterized in that after breaking the plunger (41) a part of the plunger (41) can be inserted in the front hole (12) of the cylinder (11) after retraction of the syringe needle (21) into the cylinder (11).

5. Syringe according to one of the preceeding claims, characterized in that the plunger (41; 41) and the needle holder (21; 21) can be coupled by a snap-in connection (43, 43^', 37; 43, 43^', 37).

6. Syringe according to one of the preceeding claims, characterized in that the needle holder (21; 21) is fixed or fixable in the region of the front hole (12; 12) to the cylinder (11; 11 ⁾ by a groove-projection-arrangement (13, 34; 13, 34).

7. Syringe according to claim 6, characterized in that the groove-projection- arrangement (13, 34; 13, 34) is arranged such, that the needle holder (21; 21 ), which is fixed in the region of the front hole (12; 12) to the cylinder (11; 11), can be released for retraction into the cylinder (11; 11) by rotating the needle holder (21 ; 21 ) with respect to the cylinder (11; 11).

8. Syringe according to claim 7, characterized in that the coupling between the plunger (41; 41) and the needle holder (21; 21) is adapted, to effect a rotation of the needle holder (21 ; 21 ) with respect to the cylinder (11; 11) by rotating the plunger (41 ; 41 ) which is coupled with the needle holder (21 ; 21 ), with respect to the cylinder (11, 11).

9. Syringe according to one of the preceeding claims, characterized by at least one feature disclosed within the specification or/and the drawings.