WO1998058694A1

WO1998058694A1 - An automatic retracted non-reusable syringe

Info

Publication number: WO1998058694A1
Application number: PCT/IB1998/000950
Authority: WO
Inventors: Jun Piao Teng
Original assignee: Jun Piao Teng
Priority date: 1997-06-24
Filing date: 1998-06-22
Publication date: 1998-12-30
Also published as: AU7669598A

Abstract

A syringe has an intruder (28) to engage the plunger (20) with a carrier (30) mounted within a conduit (16) of a body (10) upon fully depressing the plunger (20) manually, thereafter retracted automatically by a springy means (12, 17, 25, 251) located between the body (10) and a piston (201) causes the carrier (30) to enter into the body (10). A flangible portion (13) and rows of lateral notches (14) inside the body (10) to monitor the piston (201) to stop therein upon automatic retraction. The plunger (20) includes a fragile portion (24) adjacent the piston (201) allows its shaft (23) to break, thus isolating the retracted carrier (30) within the body (10) upon the reuser trying to take out the retracted carrier (30), and with the function to release the plunger (20) from the lateral notches (14). The intruding means includes a fragile notch (28C) for allowing the intruder (28) to break and leave a part (282) to keep the needle (33) shut inside the carrier (30) upon the reuser trying to take out the retracted carrier (30) via the conduit (16).

Description

AN AUTOMATIC RETRACTED NON-REUSABLE SY INΘE

/ , Technical Field of The Invention

The present invention rel t ^ in general to an automatic r et r a t ed nπn-r eusah ] e syr i nge ,

/. Background of The Invention

One of the ways in which acquired i mune deficiency sydrome t TϋS⁾ J? p rp rl i hy <=haπng the '> w- inj ct i n neprll c with an infected erson. A drug-user usually

a spent sy inge which then practically ]τ r ir iilaterl among the group of drug-users for convenient purpose or other reasons. In order to reduce spreading of AIDS, an absolute non-r usable sy inge is therefore, important to stop them from using a a spent syringe,

("-'■reov^p-'r, dical pr fessional*" always he in touch with several spent needles daily after inj cti ns m -i the patients, an automatic retractable syringe after injection therefore ι<* also important to protect them frr-m being hurt hy the spent needles accidentally.

USA -5344403 dated September 6, 19'^:'4 by Pahnfong Lee discl ses a retractable safety syringe which has a hub at the end of it¹ plunger which engages a needle carrier when the plunger i depressed s that the needl carrier can be withdrawn into the syringe along with the needle. The pi unger has a V-shaped notch located near the huh which can he bml en off at any angl , thereby trapping the spent npβrllp within the syringe for preven ing it fallen off to injure people. However, this patent does not discl se the needl carrier being abl to be retracted automa ally after injection, and i can be glued at the hrol-en notch for reusable in prac i al,,

Mal ysian Patent Fil ing No. PI - 960 6 8 dated 57 h, Feb ary 1996, hy Teng Jun Pi o, same Inventor of the present a li ation, discl ses a non-reusable syringe, in which the piston and the ne le carrier include interlocl- ing meaiv for 1 oc I- ing the plunger to the needle carrier upon fully depressing the plunger whereby withdrawal of the plunger causes the needle and the carrier to enter the hollow body. The shaft of the plunger includes a fragile portion which is adjacent the piston to allow the <=haft t>> breat upon a reuser trying to tat-e out the refracted needle with the carrier inside the holl w body. The needle carrier also includes a fragile portion which can be brot en off and is important that it should do so if the reuser attempts to separate the needle carrier from the pl nger, so that the spent syringe cannot be reused. Even though an attempt may be made to glue the brol- n needl carrier together again, the rejoined structure will generally not functions properly. Tn one embodiment, the structure is such that an air-leal- ing hole will generally be formed at the join.

Singapore-¹ Patent Filing No. 961 <^">4-^"'9-4 dated August 10, 1996, and Taiwan Patent Filing No. 85204956 dated April S, 1996, hy Teng -Jun Piao, disclosing another type of non-reusable syringe, e t it led s Ant i Peuse Syr inge (Mode C > , where the end of the plunger shaft and the protruding conduit of the syringe hollow body include i nt er 1 or t- i ng mean? for loci- ing the plunger at the ow r end inside the hollow body upon fully d r si g the plunger. The sh t of the plunger includes a fragile portion which i <-- adjacent the piston to allow the shaft to hreal upon a reuser trying to withdraw the plunger after l r ted within the hollow body, and i >= also important that it shoul do so, s>ι that the spent syringe cannot be reu e ,, Fven though an attempt may be made to glue the brol- en shaft together again, the rejoined structure is so weal- that it will generally be brol- en again upon repeated withdrawal of the plunger.

In the present invention, two el ngated sp ingy matters r linl-ed in between two spring hol er

which ar e separately fixed at the internal upper end of the hollow body and adjacent to the piston respec ivel . The needle- carrier so that can be automatic lly retracted with the plunger into the hollow body by the reversed elastic force from the springy matters after inserting tightly the pipe-shaped intruder of the plunger shaft into the¹ hollow centre of the needle carrier when the injection is completed, so as to prevent the spent needle to injure people ac identally. There ^ f= two fragile portions, which ar 's located at the intruder of the plunger and adjacent to the iston of the plunger shaft r espert ι vel y „ Both fragile ort ιon< are ea^cy to be brol- n off when the reuser attempts

the plunger from the needl car ier, and important is that it <=ho ld o so, so that the spent syringe cannot be reused. Fven though an attempt m<-.y he made to glue the brol- en plunger shaft together again, the rejoined st urtnre is =o weal that it will generally be brot-en ag in upon r t withdrawal of the plunger. Tn o e emhodimeni , the brol- n strurtnre of th intruder i <-- inserted tightly and deepl inlo the hollow centre of the needl c i e until reaching a the needle such that the needle τ <=- sti.rl and close the air duct at the entrance, o that the syringe will generally not function proper 1 y „

Summary of The Invention

Accord ngly, it is a primary ob ect of the presen i vention t provide an automat π retracted non-r usable sy inge

According to the most general aspect of the present invention there t<= provided an automatic retracted non-reusable <=yrιnge comprising: a hollow body having a protruding conduit at one end, a plunger associated with the hollow body for reciprocal movement therein, a needl mounted within a carrier, wherein the ar r i er is mounted within the protruding conduit, the plunger compri ing a piston connec ed to an end of a shaft, th shaft being manually operable to m ve the i stem toward? the needl ra πι^a to expel liquid from the hollow body through the needle, wherein one end of the piston and the holl w body include springy mean*--, and other end of the piston terminated with intruding m ^ns for engaging the plunger to the needle r arr i ^r upon fully d sing th pi unger whereby automatically retraction of the plunger by the springy means causes the needle and carrier to enter the holl w body, cha cter i red in that the inner wall of the hollow body includes a plurali y of projecting portions a the midway for monitoring the iston to to upon retracting autom ic lly by the springy mean^ of the bod> , the inner wall of the protruding conduit inclu es a plurality of projecting portions for locl-mg the needle carrier on injection, the shaft of the plunger includes a fragile portion in associated with a g^ adjacent the piston for hreal- ing the c-haft to isolate the retracted needle and carrier within the holl w body, and also for assisting the piston to release from b ing inter l r ted hy the lateral notches slidingly along the inner wall of the hollow body, the intruding means includes a fragile portion for allowing the part to breal- and leave the remaining part of the intruding means to stuct the air duct of the needl inside the carrier. The combination of a fragile plunger and a fragile intruder are particularly effective for preventing any reuse of the sy inge.

Preferably, the springy means l cated at upper inner wall of the hollow body 1= one or a plurality of mal spring hi-il der <=ect i on'- , and the springy me n¹ loca e adjacent to the pist n ι^r n o a plu alit .-if f le sp in holder sections with ιt<= supporting b ^f-e_f wh re in between of both Iml-ed together is one or a plurality of springy matters.

Preferably also, the intruding e n"

a fιr<-t part of intruder with air no ch s on ι *=- perimetric surface, connected to a fragile portion with a second part of intruder whe air n tches ar<^~- located on ιt<^~ perimetric <=urface„

Preferably also, the fr gil p rtion of he intruding mean^ ι <-- an annular notch.

Preferably also, the flangibl portions at the midway inner wall of the holl w body contains a perimetric flange and a plu ality o l teral notches in rows alon therein.

Preferably also, the projecting portions the upper i ner wall of the protruding conduit is an interl ping notch.

Preferably also the fragil portion in associated with the gap adjacent to the piston is a 7~shaped fragile portion.

These special fragile structures at it very difficult to rejoin the brol- n parts of the plunger, for example by gluing, in an attempt to reuse the syringe,

B ief Desc iption of The Drawings

Embodiments of the invention will now be described, by way ι-ιf exam le on 3 y , wi h refer nc tu the drawing¹-. Tn the dr aw i ng<^ ;

Figure 1

a persp ct i view of the dismantled parts o f the >"vπnqp_>

Figure PA <=hows a cros<~—sect lonal v i e>w of the assembl d sy inge on one «ι e in ica ing the springy sec (- i on

Figure T'R

ie f the same

syringe on another '-ide indicating h fr gile ec 11 on .

Figure shows a c ss-sectional (- of the assembled --yringe on the springy section when the plunger ι =^■ fully depressed and the intruder is nserted into the centre of n dle carrier.

Figure 3B shows c os<~—se 1 onal VIP of the same assembled syringe on the fra il section when the plunger is fully depressed and the intruder is inserted into the centre of needl carrier.

Figure 4A shows an enlargement of the needle car ier in its original position on fragile section in the syringe and h the intruder of the plunger is being inserted with outflow of the liquid into the hollow centre of the needl carrier,,

Figure 4R <=hows an enl rgement of the needl carrier in its or ι g ι na1 p s111 on on fr ag 11 e sec11 n i the syringe and how the intruder of the plunger has ins rted and is pr sed tightly by the internal wal l of hol low centre of carrier.

Figure sh s a cr oss— ec t i onal trip view of the as mbl

Figure f.A tio an enl rgement of the 7-shaped fragile portion in its original positio in the sy inge and hn its o heads arr- pul l d down to s ape from being interl p hy the lateral t hes when the upper end f the plunger i <•- d pres d by thumb against, the las i force from the spr ingy matters.

Figure SB shows an enlargement of the 7-<~haped fragile

port ion in its or iginal position in the syringe and h its arrow heads are e ained upright to be locl-ed by the lateral nntrhe¹" when the upper- end of the plunger is n t depressed hy thumb gain t the elastic force from the springy

matters. Figure ^"7 shows an enlargement in cross-sectional top view of the needle carrier being fixed at the protruding conduit of the hol low body and how the carrier flange is released from the jntprlorl ing notches when the user a tempts to retract the spent needle into the hollow body. Figure 8 how^s _Λ ross-sectional view of the assembled syringe with the needle carrier and the needle -3-

tarts to t-e retracted hy the elastic force from

the sp ingy matter'" into the hoi low body after the carrier flange i - .. released from he ι nt er 1 or i ng not >^~ hes ■

Figure 3 shows => cross— sec t icmal view of the assembled syringe with the needle carr ier and thε¹ needle is retrac ed in ful l at the stop position h

the arrow head of the 7-shaped fragile portion i loci-ed against the f Tangible portion of the hoi 1 ow body.

Figure 10 shows a cr ss-sec ional view of the assembled syringe with the needle carrier and the plunger being brol- n off at i s 7-shaped fragile portion when the reuser at mpts to withdraw the plunger hy violent force.

Figure 11 show a cros^s-sectional view ot the assembled syringe with the needle ,-arrιer and the econd

part of intruder being brol- n off at its annular fragil portion stict ing at the needle entrance of the carr ier when the reuser attempts to release the inserted in ruder from the needle carrier by pull ing the needl carrier from other end of the the hollow body.

Figure 1 shows another embodiment of the assembled syringe with eccentric opening of the hollo body at the

needle end and the needle carrier with its needle _ιo-

retracted into the h l body.

rence Numerals In Drawings:

II first fl ng

1? male spring holder s ction

1 "l second fl n e

14 lateral n ch s _j cr, _{1 n}^. _F,_{r Cι|}_ i_^ . _ng _no- _|_.

1 f-. protruding conduit

1 f.A upper in errirtl wal of prntru inn condui t

17 springy matter

2<^"ι pi unger

2<^">1 pi ton

21 third f 1 ange

T'^ ry oss-shaped fl anged shaft

24 7- haped fragi l por ion

^"'4 arrow head

741 gap

75 Anchor-shaped f male spr ing holder secti n

2ⁿϊ1 holder base

76 fourth fl nge

261 supporting flange

77 f i fth f I nge

28 pipe-shaped intruder

281 first part of intruder 28^"' -. ronri part of intruder

28A air notch of fιr<~t int ruder

^"' R ai r notch of --e nd intruder

28i^" V-<-haped -innul ar fragi l e not h pπ intruder base

?'^"-' r bber ti

2 B ^& econd t ι fl ange

^ dl ,-arr ιer

31 upper end n e le carr ier

31 oval haped car i r l nge

33 hol ding mean^c of needl ca rier

33 need!

Detailed Description of The Drawings

Figure 1 <=hows he- espec i e parts of a syringe of an embodiment which comprises a hollow body < 1 '^"> ■ , a plunger ' 2'^"' > and a needle carrier ^f'3f^")', The body (t^f")> has a irs flange Hi ι at the upper end and a protruding conduit <16) at the lower end. The flange (11 > h^<s a pair of mal spring holder cti n (1 ) which ar di po oppositely at the internal diameter of h flange ( 1 t > _r A second flange (1 ) is disposefl i ternally nearby the male holders (12) of the body (K^"))_j, which internal diameter i slightly smaller than the xt nal diameter of the fourth flange ( 2 > ro that the assemble needle carrier < 3<^") > and plunger < 2'^"' > is stopped there inside the body < 1 f> > as the assembled unit is withdrawn therefrom. Immediate after th f ge ( 1 > ^ -^ four rcu.-<- of late al im i HP^C ( 1-1 ) wh i • h ar dispo e inte rtl iy i four di fferen di l ions o posi t i vel to ac other along the midway of the body O> Far h lateral notch 4> of th'"- row has an equal di t nc bout- j „ 7. m , to o

another ^c wel l a<- about 3 mm i l ngthy O.p mm,, in width and O. mm,, in depth, matched paral lel a ains the same line

of l t al n tch c 4> in other nm'- al ng the inner wall of th body ' 1 <^"> ) _y so th^ the 7-shaped fragil por i n (24) of the ρl unger < 2<^"> ⁾ can be stopped at an one herein whenever i f necessary as the assembl d unit ι>; withdrawn therefrom The ι. onduit ⁽ If.⁾ ha^c a pair of projec ing inter lo i ing notches ( I ) disposed oppositely to each other at the upper inner wal l of the . onduit ( 1 f , - „ The internal diameter of the conduit < 1 <=. > is sh ut fi„f; mm. which !<■^■ matched wi h the external di et rs ,,f th upper section (31 ) of the needle r^ rt^r '^'Tn, and the cutting depth and

width of the in erlop ing notches ⁽ 15⁾ ar<a O.'o mm and 1 mm respec ively to match with he c rrier flange ⁽3tA> of the need! c r ler < 30 > _y =-, , at t he carr i er ' 3'^") > i <■- 1 oc j- ed firmly therein for injection.

The chemical composition of h material used is the a e as the xi ting singl -use syringe s ld in the ma l-et i.e. the moplastic Polypr pylene with the same physical and chemical char teristic . The capa i ty of the medication l iquid is indicated as scale msr ⁽not sh wri > on t tie wal l ι-ιf the hol low body.

The plunger ' 2<^") ) onsist,*- of a third fl nge ( 1 > al the upper end, a n-.^~-= aped fl nged shaft ( ^_,3 > wi th four wings where each wing is about i mm in depth and 1 mm in thicl-ness in th middle which is decl ining in si-e towards the upper end, and 1 ml-eri with a ^-shaped fragile fie i ion (2-1 ) at the lower end connected to a fourth flang < ^"Α > of a piston

i 2<^")1 ⁾ j, an anchor-shaped f male spring ho der section ' 1 > wi th it hase ( 211 ■ is fixed at the centre ,,f he flange ( F. > _j wherein the t«n f msJ hoi der< 21) ye- fa ing respec ively i 1 me with another two mal holders ' 12) at the upper end of the body < 1 <^"> ⁾ , being upon assembled linl-ed together by two separate components of springy matters (^' ~X7 > ,

each of whi h is eith r a tiny spring coil made of plastic or metal materials, or a piece of I- my elastic rubber band i e about 12 mm, in or iginal length and 1.1 mm. in thicl-ness, whichever is suitable n economic factor, a gap

⁽241 ⁾ i designed in between the central point of the shaft ( 23) and the centre of the female holder base t^'251 > to l t the pul l ing force on withdrawal of the plunger (^'?'^")) be scattered n the surrounding fragile portions < 7.4 > , the pi t n ' 2<^")1 ⁾ includes supporting flange ( 61 > and fi fth flange ⁽27⁾ terminating with a pipe-shaped intruder t 28 > surrounded with a rubber tip f 2"-ι > , the intruder ( 28 > is divided by a V-shaped annular fragile notch ι 28ι^" > to form a first part of intruder ⁽281 > and a second part of intruder ( 28^"') with ι f1 al b s t 28D > , both of which having plural i y of air no h s ( ^-,RA ? 2RP > along the su ounding wal ls r pect i ely to wor I- as the 1 iquid outlets upon the user attempt ing to _{ι n}=ert the c- ond pa t of int ud !' ' 28^" ) into the bottom of the hoi loo ,- ntre of the needle rwπe- i 3o ⁾ „ The chemical composition of the plunger is the same the xi ti singl -us syringe sold in the marl-et, i .e.

t her mopl a<=- 11 Polypropylene ui H. the <r e phy= ic*l and chemical hara e is ic . The ubbe t ip < "^ > ιn< 1 ti s _Λ first tip flange < ~"=-A > and a se> onrl t ιp Mange < 29P > si idingly ch ats against the inner wal l of the body. The needle carrier ⁽ 30 • c nsist of an oval shaped carrier flange ⁽3tA> at the upper end ⁽31 >, and a holding means (^'32 > at the low r end to hold the needle ( . „ Both projecting sect ions of the ,-arrιer flange .31 A) ^re i ,;,,- 1- d firmly at

the ι n ter 1 oc I- d n tche^s ( 11⁾ of the hol low body ( 10) upon the tiser attempl mg to carry out the injection.

The as^sembled sy inge m the springy side .12, I^"7 & 21) with the plunger <■ 2 ) its mitiiil depression stage when injection i carri d out as shown in Figu e 2A, and the same wor I- mg situation on the other fragile i < 14 Z> 24) with the same plunger ⁽ 2 > as shown in Figure 2P»

Since the plunger's raw material h^s ιt= own slight elastic characteri ti plus the slippery characte istic of the¹ medical l iquid to compensate the friction force, so that the int-ruder t"'8) of the plunger ( 2 > i PS<- i 1 depr ec-.<-.ed along the inner w<-tl I of the needl carrier ( > until it r ache the end h re the intruder (28) is pressed tightly therein and its base < 28D ) ι^c stuci agaιn<=t the needl 3°⁾ of the carrier ( 301 a<- shown in Figure 3 ?< 3R indicating the springy sections «12, J79, 2!fi > , and the fragile s tion ( 1 -4 ?, 24) of th ass mbled syringe r sp c iv l , and

The intruder (28) is r und-shaped -s l id plastic pipe protruding originated from th fifth flange f ^"'7 ) I o the e/.tent of 12.5 mm length till the f 1 al base c 28D > . It diameters ,-=-re appro imat ly 4 mm at the upper end and progres ively reduced to approxi at ly 2.F< mm at the base ( 28D > which external dimensions ar<^ accurately matched with the internal dimensions of the hollow centre of the needle rrier (30) The intruder (28) is e j e hy a V— haped annular fragile notch < 28C > to form a first part of intruder (281) and a second part of intruder (282> r spectively. The fragile notch < 28C > is a sharp notch starting with 1 mm in width and 1.2 mm of average depth along the xt nal surface which is located at appro imately 2 mm 3 stance from the base < 28D > of the intruder (28). The whole diameter of the notch po tion ⁽ 28ι~ ⁾ is 3„f^, mm and leaving the uncut diameter 1.2 mm which is quite easy to breal- . The first part of intruder ⁽281 > has plurality of air notches < 28A > which <sιπ is about 1 mm in wi th and 1 mm i depth of each cutting along its surrounding wal 1 , which are originated fr m the approvimate middle of the irs part of ntru

(281 ⁾ till the fragile notch ( 28f ) _? and the second part of intruder (28^~'> also hs= a plural i I of air notches ( 28P ) which sir i about , 8 mm in width and . _mm -_{± n} depth of each on he surrounding walls lon both ends, Both i not h -.- ' 28A_> 28P > wor I- a<= the 1 iqtπd utlet upon thp se is attempting to

the base ( 28ⁿ > of the second part of intruder (282' nnt π reaching at the needle (33) insid the carrier ' 3θ ) as shown in Figure 4A ?' 4R

Figure i locates the posi ion of the a s mbled yring where the four wings of the shaft (23) conne ted with same quantity of the fragil portions (24) projecting towards four directions along the inner wal I of the body MO), each fragile o ti n t "'4 ' run ac oss _Λ row of lateral no h s <14> which ar<a casted regularly with the sam p ojec in h ight, depth _f length and notch distance o each other as mentioned in aforesaid Figure 1_? to worl- as the midway stations whenever the u r t ? to pu h against the plunger (20) at the flange ⁽21⁾ for safety purpose. The female spring holder section < 2fi > of the plunger ( 20 ) having t o female holders rast towards opposite directions at the centre of the flange ⁽26⁾ in between two wings of the shaft ⁽23> to face towards another pair of mal holders (12) which are- casted on the inner wall of the flange (11 ) r p t i vel y

Eai" h fragile po ion⁰ ' 24 > ι- composed hy one piece of independent rig-rag plastic --] ice which upper end a so i with a flat -top ar o head ( 2-1A> pointing upright agam.t the lateral notches ahove_f connected to the flange ' 26 > , and 11 <- lo r end ι<= l inl-ed with the central rt ion of the h t " ' 23* The h le-^, nig — 'ag si ice -i- d about 1 , 2 mm in wirlth_j 1 mm in thιcl-nes- _f ^nd the o I- my distance from the connecting point at the flange ( ι^r. ) In the a ro head ' ~'4A )

is about 6 mm, wtiich forms a rig-rag gap ( ^"'-11 ) about 1 mm in width along the female holder b=*se t ^C!1 ) and r ss thereon until terminating at another connecting end of the opposite fragile portion ( 24) which i al o on the same flange ⁽ 7' > When the plunger ⁽ 20⁾ ι^e depres ed at the flange ( 21 > during injection on pumping the medication l iquid al ng the innπ wal l of the body i^'n, th u hing force wil l be concentrated at the central portion of the shaft¹ < 23 > . 8 i mul taneriul y another group of pu ling force wil l be incurred by the elast ic function along the springy matters ( 17) scattering evenly at the holder base ι Z'T<i > as well as other four connecting ends of fragile portions ( ^"'4 > at the flange < 2f. > _y both ccmf 1 i cf J ve fo c * meet together at the arrow heads ⁽ 24 ) which is so weal- that it wil l pul l the arrow he ds ⁽ 24A ⁾ a little bit downward about 1 mm. distance of gap from the mner wall of the¹ body ( 10>_f so -1R- th< t the ar ow head ( 24A > e ent inter lo i mg fnuii the lateral notch (14) which i about 0„T1 mm at projecting height from above with a gap distance ,-. f 1 mm between each other a long the inner wall of the body (t > as shown in Figure 6A„

Put on the contrary, when the plunger ( 2θ ) i <- not in the statu of depression; the pulling force incu r d by the el stic function along the <=prmgy matte s ι I7ι i <=^■ the onl e istmq force sc tt r at the hπl π base ι 2*31 > Λ= wel 1 ^.^ other four connect mg enιl^c of fragile

' 24 > at the¹ flange ( 2β ) , s the arrow heads ( 24 ) he^r no confl ict that the arrow oint thereof will be remained standing upright at the original position to brush on the peal surface of the immediate lateral notch (14⁾ above unt il being intervened by the l ral notch (14) ahea where the arrow heads .24 > are to be inter lo i- ed immediately the ein as shown i Fig .SB.

Figure 7 lo ates the positions of the assembled needle carrier ^("3<^">) and the conduit (If..) f the body (10)_y where a pair of ι nter 1 oc I- mg otch s ⁽15) projecting towards each other oppositely at the inner upper end of the conduit ^flβ>» The projec ing l ngth of the notches (15) i only 0, mm off the inner wall therein,, and just good enough to ,- over on the top edge of the oval s ti n of the carrier fl nges (3tA> leaving the upper end (31 > of the carrier ' 3θ . to e properly the upper inner wall <tf.Λ> of the conduit 'If.) which internal diameter is accurately matched with the external diameter of the inserted po tion of the carrier ( ) _y so that both projecting oval sections of the carrier flanges ⁽31A> are 1 nr I p firmly hy the notche^c (15> for securing injection, but the carrier ( 3 > can he easily unlocl-ed hy turning the car ier flanges (31A> a little bit of angl s off therefrom either towards the l ft or righl di e tion when the intruder (28) is inserted fully and tightly m-f-o the hollow centre of the carrier ^('30).

When the intruder (28) ι<= inserted fully and tightly into the hollow centre of the carrier ⁽30⁾, and unlocls the carrier fl nges (31 A) as aforesaid, the el stic force along the springy matters (17) between the male holders ⁽12⁾ at the fl nge (11) and the female holders ( 25 > adjacent to the piston (201) will aut mati ally retract the piston (201⁾ together with the intruder ( 28 > a d the carrier ( 3 ) slidingly into the body (10) as shown in the Figure „

Each interloclmg notch ⁽15) at the internal upper end of the conduit (16) is designed in line with the specific row about 3 mm in width of the lateral notches ⁽14⁾ which are regularly casted at the internal midway of the body ⁽l > where the fragile portions (24) will als come across n reciprocal movements, so that when the intruder (28) as aforesaid turns the carrier flanges ⁽31A> a little bit of angles off the inter lo i- ing notches (15> using the flange ⁽21) at the upper -2<">- end Aft the injection, the ela fii. force from the ingy mat er'-" (^' 1 ^"7 > will aut mati ally re+ract- the piston ( 201 ) wi h the carrier (^'30) slidingly along the smooth inner surface of the body ⁽ 1 ⁾ wi h more e?a<~ <a _v instead of brushing across the specific rows of lateral no h 4> which r quire the user d pres i g on the flange ('21 ) with thumb to force the arrow heads 1 - ^ > of the fragile portions (24) bowing down to prevent inter 1 o [ hy th lateral no ches (24) as aforesaid in Figure 6A, until the fragile porti n (24) r the flange < 26 > come to stop at the flange '13) which diameter is si ightly smaller than the external diameter the flange ^('26 > as shown in Figure 9,

After the fragile portions (24) or the flange (26) come to top at the flange (13) as aforesaid, when the econd user attempts o tal the whole plunger (20) cud, of the body (tO> for releasing the retracted carrier t 30 > to reuse, he has only two alternative possible ways should do so„ One alternative is to withdraw the shaft ( 23 > with violent force. In so doing, all the pulling force will be concentrated in the fragile portions (^'24 ) which are only about 1.2 mm in width, 1 mm in thicl-ness connected o the fl nge ⁽26) where the designed structure is strong enough to hold against the usual gentle force when the user attempts to pump the medicative liquid but not strong enough to hold against the violent force instead, thus hrea ng the fragile portions ^('24 > at the

point* where is underneath the arrow heads ' 24A ) a sh wn in Figure l „

Anottier alternative is to hold the shaft (23) firmly on one ide, and simultaneously pulling violently the needle t 3 > at other side for purpose of r el ea^c ing the carrier ( 3θ > from the intruder ( 28 > inside the body (10). In so doing, all the force will he concent ated in the fragile notch ( 28i" > which uncut diameter is only about 1 , ^"' mm between both fιr ⁼ t part of intruder (281 > and second part of intruder (282)_, thυ^c easy to breal- \ ψ the fragile n tch ( 28i^~ > and leaving the second part of intruder (282) with its flat bas < 28D > therein to stud- tightly at the entrance of the needle (33) where air or liquid is so disallowed to go through as shown in Figure 11.

Another type of syringe with eccentrii opening of the hollow body ( 10> at the lower end is shown in Figure J . The same principles apply here as mentioned above where the piston ⁽201) together with the needle carrier ⁽ 3θ > is automatically retracted by the springy matters (17) as well as the plunger (20⁾ and the intruder (28⁾ are designed to be broken off at the fragile portions 1 4 _y 28ι^~ > upon violent withdrawal „

A reuser may then attempt to glue the brol- n parts of the plunger ⁽20> and the intruder '28' at both the fragile portions ⁽24, 28C > , but due to both brc en areas (24, 28C > are so small and weal that even after conventional gluing (not hown) they are still impossi hi e t support the viol nt pulling force upon repeated withdrawal as aforesaid a r di ngl y »

While the preferred embodiments of the present invention and their advantages have b p-n disclo n the above detailed description, the invention i ot limited thereto hut only by the scope of the appended claims.

Claims

1 An automatic retracted non- eusable syr mge comprising ; a hollow body MO> having a protruding conduit (16) at one end, a plunger t 2╬╕ > associated ΓÇó.-i-ih said ho )' MO) for reciprocal movement therein, a needle (33) mounted wi hin a carrier ( 30 > , wherein sai carri r < 30 > i un e within said condui (16>, s i plunger om risin -> piston < ^~'Oi > connect d to an end of .-- shafl ( 23 > . said shaft (23) being manually operable to move said piston (201) towards said carrier (30⁾ to expel liquid from said body (10> th ough said needle (33), char a er i red m that one end of said piston ( 01 > and said body (10) include springy means ⁽12, 17_y 25, 251), and other end of said piston (201) terminated with intruding means (281, 282, 28A, 28Et, 28i^" , 28D > for engaging said plunger ( 2╬╕ > to said carrier (30) upon fully depressing said plunger ( 20 ⁾ whereby automatical retraction of said plunger ⁽ 2╬╕ > by said springy means (12, 17, 25, 251 ) causes said needl (33) and carrier (30) to enter said body (10⁾, the inner wall of said body (lO) includes a flangible portion (13) and a plurality of lateral notches (14⁾ at the midway for monitoring said piston ⁽ 01 ⁾ to stop therein, upon said plunger ( 2╬╕ ) is retracted automatically by said springy means ⁽12, 17, 25, 251 > of said body (10), the mner wall of said conduit (16) includes a flangibl portion (15⁾ for inter lo i ing said needle ("33) and carrier ( 30 > on injection, said shaft ' 23 ) of said plunger ( 2╬╕ ) include^ a fragile po tion '24⁾ in associated with a gap ⁽241 > adjacent said piston (201) for breal- mg said shaft (23) to isolate said retracted needle ⁽33) and r\╬│- r -\ <?╬│ ' 30 ⁾ within said body ⁽10), and al o for assisting said piston ⁽201⁾ to release from being mterlocl-ed by said l teral notches (14> slidingly along the inner wall of id body (JO), said intruding m ant (281, 282, 28A, 28E^, 28C , 28D > in ludes fragile por ion ( 28<^~ > whi h is allowed to breal- and leave the remaining pa <28.-> of said intruding means to stncl the duct entrance of said needl (33) inside said carrier ( 3" > for preventing inflow of air or liquid through said retracted needle (33) and carrier ( 3╬╕ ) .

2. An automatic retracted non-reusabl sy inge according to laim 1 wherein said springy means located at the inner wall of said body (10) is a male spring holder section ⁽12>, and said springy means located adjacent to said piston (201) is a f mal spring holder section ⁽25⁾ with its supporting base (251 >, wherein between of both 1 ml- ed together is a springy matter ⁽17⁾ which material is of elastic and el ngated cha acter i t ICS.

3. An automatic retracted non-reusable syringe according to claim 2 wherein said sp ingy matter ⁽17⁾ i either a spring coil of plastic or metal - based material, or a piece of rubber band.

4. An automatic retracted non- usabl syringe according to cl im 1 wherein said intruding means comprising a first part of intruder (281 > with a plurality f air notches < 28A > on its p rim t ic surface, connected to fragile poH ion ( 81^") with a second part of intruder (282) where a plurality of air notches ( 28B ) are located on its perimetric surface.

5 An automat ╬╣< retracted non-reusable sy _╬╣nge according to laim 4 wherein said fragile portion of said intruding means is an annul r notch ( 28╬╣^" )

6. An automatic retracted non-reusable syringe according to claim 1 wherein the internal diameter of said flangibl portion (13> at the inner wall of said body ⁽l'^")> is slightly smaller than the external diameter f sa id p ╬╣ ston ( 01 > .

1 , An automatic retracted non-reusabl syringe according to claim J wherein said plural ity of lateral notches ⁽.14⁾ at the midway inner wall of said body (10) are casted in parallel rows regularly with the same projecting height, depth, length and notch distance t each other .

8. An automatic retracted non-reusable syringe according to claim 7 wherein the diameter between the opposite rows to each other of said lateral notches (14> within said body (10) is slightly bigger than external diameter of said pi t n f 01 ) .

9. An automatic retracted non-reusable syringe according to claim 1 wherein said flangible portion at the inner wall of said conduit ⁽ 16⁾ i an inter I oc (Γûá mg notch (1 ).

i⁽>, An automatic retracted non-reusable syringe according to cl im 1 wherein said fragile portion associated with sai gap ⁽2 1 ) adjacent to said piston (201 > J <=ΓÇó a Z -shaped fragile portion ⁽ 24⁾.

11,, An automatic retracted non-reusable sy inge according to laim to wherein said -shaped fragil portion ⁽ 24⁾ compri ing an independent zig-╧Çag pl stic slice which one end asso iated with an arrow head ⁽.24A> pointing upright against said lateral notches ⁽ 14⁾ above, is connected to said piston ⁽201 ⁾, and its other end is linl-ed with the central portion of said shaft ⁽ 23 > , wherein it forms said rig-rag gap (241 > along said holder base ⁽251 ⁾ and across therein until terminating at another connecting end of opposite said Z-shaped fragile portion ⁽ 24⁾ which is also on same said piston ⁽201 > therein.