WO1998006447A2

WO1998006447A2 - Anti-reuse syringe (mode c)

Info

Publication number: WO1998006447A2
Application number: PCT/IB1997/001190
Authority: WO
Inventors: Jun Piao Teng
Original assignee: Jun Piao Teng
Priority date: 1996-08-10
Filing date: 1997-08-06
Publication date: 1998-02-19
Also published as: AU4568397A; CN1227504A; GB2330537A; WO1998006447A3; GB2330537B; GB9901108D0

Abstract

An Anti-Reuse Syringe (Mode C) comprising: a hollow body (10) having a protruding conduit (14 to 16) at one end, a plunger (20) associated with the body (10) for reciprocal movement therein, a needle (37) mounted within a carrier (30), wherein the carrier (30) is mounted externally onto the wall of the protruding conduit (14 to 16) of the body (10), the plunger (20) comprising a piston (201) connected to an end of a shaft (23), the shaft (23) being manually operable to move the piston (201) towards the carrier (30) to expel liquid from the body (10) through the needle (37) wherein the piston (201) and the protruding conduit (14 to 16) include an interlocking means (141 and 202) for locking the plunger (20) with the protruding conduit (14 to 16) upon fully depressing the plunger (20) thereby trapping the plunger (20) firmly inside the body (10) wherein the shaft (23) of the plunger (20) includes a fragile portion adjacent the piston (201) to allow the shaft (23) to break upon a reuser trying to take out the plunger (20) from the protruding conduit (14 to 16) inside the body (10).

Description

ANTI REUSE SYRINGE (MODE C>

/. TECHNICAL FIELD OF THE INVENTION:

The present invention relates in general to an Ant i peusp Syr inge < Mode C > .

/. BACK8R0UND OF THE INVENTION:

On.? of

way*, in which Acquired Immun? Deficiency Syndrome-" ⁽AIDS⁾ spread is, by sharing the same injection needle with an infected per con. In order to reduce spreading of AIDS, a disposable syringe is used. However, a drug-user usually reuse a spent syringe which then prac ically IE- circulated among the-¹ group of drug-users for convenient purpose* r nther reasons. It I <_- therefore, important to stop them from u&jnri spent syringe.

USA-5344 03 to Pahnfong Lee < 19 -1 » dis l ses a retractabl safety syringe which has a hub at the end of its plunger which engages a needle carrier when the plunger is depressed so that the needle carrier can be withdrawn into the syringe along with the needle. It has a V-shaped notch located near the hub which can be broken off at any angle, thereby trapping the spent needle within the syringe for preventing it fallen off to injure people. However, the broken V-shaped notch in practical can be glued to recover for reusable.

Malaysian Patent Filing Certificate No. PJ-9600638 dated 17th, February 1996, by Teng Jun Piao, same Inventor of the present applicat on, discloses a non-reusable syππge, in whirh the piston and the needle carrier include interlocking means for locking the plunger to the needle carrier upon fully depressing the plunger whereby withdrawal of thε? plunger causes the needle and the. i-arriev to enter the hollow body. Th-> shaft of the. plunger includes a fragile portion whirh IE adjacent the piston to llow the shaft to brea. upon a reuser trying to ta. e out th» retracted needle with the carrier inside the holl w body. The needl ca rier includes ca fragile portion which can he bro.en off and ir important that it choultl ri' ■ PH, sn that he spent syringe cannot be reused. Even though an attempt may b made to ul u the b o.en needle rarπpr together aciain, the rejoined structure will generally not functions properly. Jn one embodiment, the st ucture ι<-> such that an air- leal ing hole will generally be formed at the join.

In the present invention, it is entitled as " Ant 1 Reuse Syringe fMo C>", which Patent has been filed by he^-1 inventor in Singapore on August 10th, 1996 ⁽File No.: 9610429-4. It discloses the end of the plunger shaft and the protruding conduit of the syringe hollow body include inter loc. mg means for locling the plunger to the lower end inside the syringe hollow body upon fully depressing the plunger. The shaft of the plunger includes a fragile portion which is adjacent the piston to allow the shaft to breal upon a reuser trying to withdraw the plunger which is 1 o . ed inside the protruding conduit of the syringe hollow body, and is important that it should do so, so that the spent syringe cannot be reused. Even though an attempt may be made to glue the bro. en shaft together again, the rejoined structure will generally be broken again upon repeated withdrawal of the plunger. SUMMARY OF THE INVENTION;

Accordingly, it u a primary object of the present invention to provide an Ant i Reus Syringe ⁽Mode C>.

According t < > the most general aspec of the present invention there is provided an Anti Reuse Syringe ⁽Mode? C> comprising: a hollow body having a protruding conduit at one end , a plunger associated with the body for reciprocal movement therein, a needle mounted within a carrier, wherein the carrier is mounted on the external wall of protruding i. onduit, the plunger comprising a p . st on with a pipe- haped portion extended forward connected to an end of a shaft, the shaft being manually operable t, < . m e the piston with the pipe-shaped portion towards the protruding conduit to expel liquid from the hollow body through the needle, wherein the pipe-shaped portion and the protruding conduit include th<? mterloc. ing means for I oc . ing the-- plunger to the protruding conduit of the hollow body upon fully depressing the plunger, whereby the shaft of the plunger includes a fragile-¹ portion adjacenl the piston tu allow the shaft to brea. upon a reuser trying to withdraw the shaft violently after 1 c ed .

Preferably, inte locking means located at the protruding conduit of the hollow body is a male lo t ing section and the interlocking means located at the pipe-shaped portion adjacent the piston is a female loc. ing section.

Preferably also, the fragile portion in the plunger shaft between the plunger and the shaft comprises four weal connected wings of the shaft with an isolated gap in central position. BRIEF DESCRIPTION OF THE DRAWI ΘS:

Embodiments of thε> invention will now be desrribed, by way of example only, with reference to the drawings.

In the drawings; Figure 1: shows ... perspect ive view «.ιf the dismantled parts the syringe. Figure 2: show? e. rr os^-se t lonal view f tht-> assembled syr inge. Figure 3; shows a cross se tional view of the assembled syringe when the plunger i <- fully depressed and interloc.ed with the protruding conduit of the h i 1 ι-ι b dy. Figure 4: shows- an enlargemen of the protruding conduit in its original position in the syringe and how the plunger inte lock with it. Figure 5: shows a cross-sec ional view of the assembled syringe- which is interloc. ed at the pro, ruding conduit m its original position in the syringe and the¹ plunger hru. en off at its fragile portion when it is withdrawn violently. Figure 6A: shows an enlargement of a cross-sectional view of the fragile portion f the plunger when it is under normal ir umstance. Figure 6B: shows an enlargement of a cross-se ional view of the fragile portion of the plunger when it is depressed under normal ircumstance. Figure 6C : shows an enlargement of a cross-se tional view of the fragile portion f the plunger when it is on the way to withdraw viol ntly under inter 1 oc . ed c ircumst nce. Figure 7A: shows an enlargement of the glued broken part? of the fragile po tion of the plunger.

Figure 7B: shows an enlargement i ■ f the glued bro. en parts of the fragile portion of the plunger, bro. en again when he-- reuser trys to rel ase the plunger from th<? in ter I cu: . ing means by way o violent withdrawal of the shaft .

Tigure 8: -~hows another embodiment of the assembled syringe with eccentrj>. opening of the* hollow body at the l wer end with the 'similar designed st ucture, of the fragil portion of the plunger and the in er loci ing mean^r. of both male and f enir.1 e loci ing sections in the hollow body.

Reference Numerals In Drawings:

10 hollow body

14 protruding r nduit (upper part »

14A first flangible br„zΛ

14P first notch

141 mal loci ing se tion

1? protruding conduit (.middle part >

16 protruding conduit (l wer part-'

20 plunger

2 1 piston

202 female l king section

21 second flange

23 cross-shaped flanged shaft

24 f r ag 11 por 11 n 2 1 gap ? conical ly shaped flangible section 2 third flange

27 fourth flange 7 t fifth flange 0 pipe-shaped po tiori 8A second flangible hoc. 9 rubber 1 lie material <^"> needle carrier 1 upper end of needle carrier 6 holding means of needle carrier 7 needl

ETAILED DESCRIPTION OF THE DRAWINGS:

Figure 1 shows the respec ive- parts of the syringe which comprises a hollow body (10), a plunger (20> and a needle car ier (30). Body (10- ha=v a first fl nge 11 - at the upper end and a protruding conduit C14 to lG^ at the l wer end. Protruding conduit (14 to 16^") ι_ designed such that the wall is not parallel against one another with same internal and external diameter , instead, its internal diameters a e approximate from 4.5 mm. (14 through 2.5 mm. _15> to the end of 2 mm. (16^'), and 11 ^c> external diameter? a t appro imately of 6.5 mm. (14⁾, 4.5 mm. (15) and 4 mm. .16⁾ respe tively, wherein a first flangible? hool (14A is designed along the internal wall of protruding conduit (14⁾ which acts as a mal loo. ing section (141) of the inter I e l ing means. The chemical composition of the raw material used is the same as the existing single-use syringe sold in the mar let, i.e. thermopl stic Polypropylene with the samp physical and chemical characte is ics. The capacity of the medication l iquid (not shown⁾ is indicated as scaled ar. s on the wall of body (10.>. Plunger (20) consists of a second flange (21^"ι at the upper end, a cross-shaped flanged shaft (23J in the middle which is declining in sizes towards the upper end, a piston (201), a fragile porHon (24") which IF adjacent to piston (201), <* third flange (26^"> conner- ted to ct conical ly shaped flangible section (25) and piston (201) terminating with a female loci ing section (202"⁾ surrounded with a rubber 1 lie material (29). Femalr- loci ing sect i cm (202⁾ consist? of a fourth flange (271 connected with a smaller fifth flange (271 ) which are to support a pipe-shaped portion (28⁾ extended forwards at thr- lower end, wherein a second flangible hoc. (28A> it fixed for the inter I r . ing means. The chemical c mposition of raw materials used m plunger (20) IH. the sam€- at" the existing single-use syringe sold in the mar.et with the same physical and chemical characteristics. Pubberli.e material (29"⁾ I eeps the internal body (10) in somewhat vacuum condition.

Needle carrier (30) has no critical point, except that its internal diameter of upper end (3D must be in the appropriate sizes, so as to fit tightly onto the external wall of protruding conduit (14 to 16) of body (10⁾. Needle carrier (30⁾ l? terminated with a holding means (36) to hold needle (37). Chemi al composition of the raw materials- used ar e the same as the existing single use syringe sold in the market, with the same physical and chemical character ist ics.

The assembled syringe with plunger (20) in its initial depression stage when injection is carried out as shown in Figure 2.

Plunger (20)'s raw material har it- own slight elastic char ct istic plus the slippery char ct ristic of the medical liquid to compensate the minimum friction force, so that plunger (20^" is easily depressed along body -1G» until it reaches the end where it ι. smoothly 1 oc I ed into protruding condui (14.) a<=^ shown in Figure C'.

Figure 4 shows plunger (20^') is going t inter loci with protruding conduit (14 to 16) of body (10), wherein female loci ing section (202⁾ has a gap about 4 mm. in depth and 1.5 mm. in width, to separate pipe-shaped portion (28) into two parts, each of which is a second flangible hool (28A) , with 1.5 mm. in thiclness, declining at an angle of 26 degree, being inserted into male loci ing section (14U, which is 1.75 mm in thiclness, with mm in length, inclines at an angle of 14 degree till reaching at a fιr< t notch (14B) which is about 0.75 rn., in depth. Thus male loci ing section (141) with i 15- notches (14B) a e strong enough to hold against the force when a reuser tries to tale out pi unger (20) from protruding conduit (14) inside body (10).

The surrounding thiclness of mterlocling means (141 ?/ 202⁾ when connected together is strong enough to hold piston (201⁾ and shaft (23⁾ firmly, ^ that when the reuser attempts to tal out plunger (20), all the force will be concentrated in fragile portion (24⁾ which is weakly connected to third flange (26), thus breaking pl nger (20⁾ as shown in Figure 5. Fragile portion (24) is at the lower end of shaft (23⁾ with 4 wings, each of which is approximate 0.5 mm. in thickness and 1.5 mm. in depth connected to third flange (26), adjacent is a gap (241) approximate 0.5 mm. in width between the central point of shaft (23), and conical ly shaped flangible section (25) which is designed at the peal approximate 1.5 mm. in diameter inclining towards the base approximate 4.5 mm. in diameter connected to third flange (26^*) s- shown in Figure 6A.

Tn its initial stage of injection, its pushing force will depress the central point >>f shaft (23) across gap

(241⁾ against the peal of cone (25⁾ whereby fragile' portions (24⁾ with appro imat <^">.5 mm. thiclness connected to third flange (26) ar e so weal that at tht«_ moment to be folded a little, and so plunger (20⁾ is depressed towards the l wer end of body (10⁾ until locked at protruding conduit (141 as shown in Figure & .

When pumping the medicine before locled, the pulling force on shaft (23⁾ should be usually 11 ow and gentle which only stretches the central point of shaft (23) a little bit distance off cone (25^"), and so fragile portions (24⁾ am to be stretched tightly against third flange (26) surface as shown in Figure 6 . But when after l cl'ed, the pulling force on shaft (23) must become so viol en. that fragile portions (24) are easy to be torn off, and so piston (201⁾ is locled at the position of male loc ing section (141⁾ ιn ιd<=> body (10).

The reuser then perhaps attempts to repair the bro en fragile portions (24), as well as the central point of shaft (23) against the peak of cone (25) with the glue at

(242⁾ and (243⁾ respectively as shown in Figure 7A. But due to each broken part at fragile portions (24) is only 0.5 mm ⁽thicl > x 1. mm <deth> = 0.75 sq . mm. in ar ea and the peal of cone (25) is 1.5 mm. in diameter as shown in Figure 7B, thus they ar e too small and weal- even after gluing to support the violent pulling force upon attempting to withdraw piston (201⁾ from interlocking means (141 & 202).

Another type of syringe with eccentric opening of body ⁽10⁾ at the lower end as shown in Figure 0. The same principles apply here as mentioned above wherc plunger (20) is being depressed towards protruding conduit (14 to 16) of body (10).

Whil he preferred embodiments of the present inven ion and their advantages have been disclosed in the above detailed desc iption, the invention is not limited thereto but only by the? spirit and scope of the appended claims.

Claims

1. An Anti-Peuεe Syringe (Mode C> comprising: a hollow body (10) having a protruding conduit (14 to 16) at one end, a plunger (20) associated with said body (10) for r e iprocal movement therein, a needle (37) mounted within a carrier (30⁾, wherein said carrier (30⁾ is mounted externally onto the wall of said protruding conduit (14 to 16) of said body (10), said plunger (20) comprising a piston (201 > connerted to an end of a shaft (23⁾, said shaft (23) being manually operable to move said piston (201^") towards sai carrier (30^") to expel liquid from said body (10) through said needle (37^") wherein said piston (201) and said pr truding conduit (14 to 16) include an inte locking means (141 _.202) for loci ing said plunger (20) with said protruding conduit (14 to 16) upon fully depressing said plunger (20) thereby trapping said plunger (20) firmly inside said body (10), characterized in that said shaft (23) of said plunger (20^") includes a fragile portion adjacent said piston (201) to allow said shaft (23) to breal upon a reuser trying to tal out said plunger (20) from said protruding conduit (14 to 16) inside said body (lO).

2. An Anti-Peuse Syringe (^'Mode C ^') according to claim 1 wherein said fragile portion adjacent said piston (201) is a cross-shaped flange (24) with limited thiclness and length connected to said piston (201).

3. An Anti-Peuse Syringe (Mode C > according to claim 1 wherein said interlocling means located at said protruding conduit (14 to 16) is a male loci ing section (141⁾ and said inter 1 o I inn means adjacent said piston (201) is a female locking section (202).

4. An Ant i -Reuse Syringe (Mode 0^"> according to claim 1 wherein the main supporting portion by force to push said piston (201) associated with said fragile portion (24) at end of said shaft (23) is a conic lly shaped flange (25).

5. An Ant i -Reuse Syringe.' (^'Mode C> according to claim 1 wherein a gap (241) in between the central point of said shaft (23) and said conical ly shaped flange (25), acts as a sub<5idiary fragile portion of said piston (201).