CA2076864A1

CA2076864A1 - Retractable needle seringe

Info

Publication number: CA2076864A1
Application number: CA 2076864
Authority: CA
Inventors: Patrice Elfandi
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-02-26
Filing date: 1991-02-25
Publication date: 1991-08-27
Also published as: FR2658724B1; FR2658724A1; EP0516761A1; AU7551491A; JPH05503649A; WO1991012841A1

Abstract

2076864 9112841 PCTABS00106 La seringue est munie d'un embout (4) prolongé intérieurement par des languettes flexibles (9) terminées par des ergots (10). Un élément mobile creux (16) dont l'extrémité porte l'ajustage (20) qui lui est faiblement solidaire, peut coulisser entre les languettes, il est bloqué vers l'arrière par les ergots (10), sa cavité (23) est munie de barbillons (24). Le piston (2) a un prolongement en plusieurs parties: un segment large (26) caréné peut s'engager entre les divers ergots (10), un segment (28) muni de barbillons (29) peut coulisser dans la cavité (23), lorsque le piston (2) est à bout de course il fait poussoir et détache l'ajustage (20) de l'élément mobile (16), un segment (30) peut coulisser dans le conduit de l'ajustage (20) et est muni de barbillons (31). En fin d'injection le segment (26) écarte les ergots (10) et libère l'élément mobile (16) vers l'arrière, l'engrenage des barbillons (29 et 24) et l'accrochage de l'ajustage (20) par les barbillons (31) concourent au retrait en arrière de l'ensemble élément mobile-ajustage-mandrin (16-20-19) et de l'aiguille dans la seringue par traction du piston.2076864 9112841 PCTABS00106 The syringe is provided with a nozzle (4) extended internally by flexible tongues (9) terminated by pins (10). A hollow movable element (16), the end of which bears the adjustment (20) which is weakly attached thereto, can slide between the tongues, it is blocked towards the rear by the lugs (10), its cavity (23) is fitted with barbs (24). The piston (2) has an extension in several parts: a wide segment (26) faired can engage between the various lugs (10), a segment (28) provided with barbs (29) can slide in the cavity (23) , when the piston (2) is at the end of its travel, it pushes and detaches the adjustment (20) from the mobile element (16), a segment (30) can slide in the adjustment conduit (20) and is provided with barbs (31). At the end of injection, the segment (26) spreads the pins (10) and releases the movable element (16) towards the rear, the gear of the barbs (29 and 24) and the attachment of the adjustment (20 ) by the barbs (31) contribute to the withdrawal back of the mobile element-adjustment-mandrel assembly (16-20-19) and of the needle in the syringe by pulling the piston.

Description

~ WO9l/l284l 2 0 7 6 8 6 ~ PCT/FR9ltO0154 Seringue à aiguille retractable.

L'invsntion concerne une ~erin~ue.
Uee serinnue convention~elle a un coros cvlind-riaue dans leauel coulisse un ois~on et dont la base porte un aju~ta~e sur lequel s'adspte le mandrin d'une ai~uille.
Serin~ue et ai~uille doivent en peincips etre jetees apres usape uninue ; il arrive cependant qu'elles soient re-utili-sees et propagent des maladies (~id2~ hepatite virale ~).
Un materiel a injection a donc ete conçu pour etre inutilisable apres usape unique : la seringue est mu-0 nie d'un embout cylindrique ~rolon~é par l'aiusta~e~ l'un-se~ble etant faiblnoent solidaire! tandis que le piston a un prolonseoent q"J. foro~ pnu-.soir de~achnn~ l'a,usta~e de - l'eohcut nt le bloquant dsns le mandrin de l'ai~uille lors de ~'injection,l'enarena~e de barbillons sur l'ajustage et dans 3a cavite du mandrin rend l'aipuille inutilisable.
Cette aiuuille rendue inutilisa~le peut cependant transmettr~ le5 maladies par piqure apros injeotion, soit accidentelleoont (oanipulations par le Dersonnel soi~nant ou Drepose au nettoieoent) soit fortuiteoent ~piqure sur les-plapss et lieux publics), -- la presente invention a pour but de remodier a cet inconvenient et propose a cet effet une serinpuo conoue de maniere telle oue l'aipuille rendue inutilisable après usa~e puisse rentrer dans le corDs de la serin~ue formsnt un boitier jetable apres usape.
Tout risque de piaure seDtiauer oeoe fortuite ~ ' , '` ' '' . . ~ .`. " ,' ...... ~' ' -''~` '`' ' '. '` ' ;'l " ` ` ` '`
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~ - WO91/12841 2 0 7 ~ 8 6 ~ PCT/FR91/00154 est alors ecarte.
Le corps de la serin~ue est munie a sa base d'un embout cyiindrique externe.
Suivant une caracteristique de l'invention, cet embout est limite a son extre~ite par un rebord delimitant une ouverture cylindrique dont le diametre interieur est le~erement superieur au diametre exterieur du mandrin de l'ai~uille. Ce rebord est destine a servir de butee.
Suivant une autre caracteristique de l'inven-tion. l'embout cylindrique externe a un prolon~e~ent in-terne egale~ent cylindrique, qui comporte des fentes lon-~itudinales disposees selon les lignes des ~eneratrices.
Ces fentes separent des portions de surface cylindrique qui forment des languettes flexibles en nombre variable et é~al a celui des fentes qui les delimitent et terminees par des er~ots. Les ergots sont caracteristiques, la coupe longitudinale d'un er~ot affecte la for~e d'un tra-peze-rectan~ie dont la ~rande baso exterieure prolonge la lan~uette corresponbante et la petite base interieure qui doit etre de di~ension suffisante est prolonyee par le cBt6 non parallele le plus ~rand. Le cote non parallele le plus petit forme un angle droit avec la lan~uette et est destine a servir de butee. La zone de jonction du prolongement cy-lindrique et des lan~uettes flexibles peut comporter un lé~er relief destine a ss~urer l'etanchoite avec l'element mobile cylindrique.
Suivant une autre caractéristique de l'invention, 1 ' emDout cylindrique externe et son prolon~e~ent interne . .
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~V091/12~1 PCT/FR91/00154 reoivent un eiement mobile cylindrique creux dont la partie distale par rapport a la base de la serin~ue supporte l'extremite proximale cylindrique de l'ajustaqe avec lequel il rorme un ense~ble etanche mais faiblement solidaire.
L'element mobile cylindrique proprement dit est constitue de deux parties :
- La partie distale (prlon~ee par l'ajusta~o) qui repond a l'ouverture de l'embout cylindrique externe de la serin~ue : son diametre externe est le~ère~ent superieur lG au diametre externe du mandrin de l'ai~uille. son diamètre interne delimite une cavite cylindrique dont le diametre est lui-meme legerement superieur a la section de la partie cy-lindrique de l'ajusta~e.
- La partie proximale formant le corps de l'ele-ment mobile cylindrique : son diametre externe est legere-ment inrérieur au diam0tre interne de l'embout cylindrique dans lequel elle est susceptible de coulisser, ~ais légere-ment superieur au diametre du rebord deli~itant l'ouverture de l'embout cylindrique externe de la serin~ue qui forme donc une butee empechant le deplacement de l'element mobile cylindrique dans le sens postero anterieur.
- La partie moyenne de la surface cylindrique de cette partie proximale supporte un joint en caoutchouc ou 0n plastique souple destine a parfaire ~'0tancheite et qui vient en re~ard du relief de la zone de jonction du pro-lon~ement cylindrique interne avec les lan~uettes flexibles.
Lorsque les lan~uettes ne sont pas ecartees , elles etran-~lent le joint assurant l'otancheite pendant l'injection, lorsqu'elles sont ecartees en fin d'injection, le joint est ~: . .: ,: -. . . . ,:
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WO 91/1 ~ WO9l / l284l 2 0 7 6 8 6 ~ PCT / FR9ltO0154 Syringe with retractable needle.

The invsntion relates to a ~ erin ~ eu.
Uee serinnue convention ~ she has a corvos cvlind-riaue dans leauel slides a bird ~ on and whose base carries a aju ~ ta ~ e on which adspte the mandrel of a ai ~ uille.
Serin ~ ue and ai ~ uille must in peincips be discarded after unusual usape; however, they may be re-used sees and spreads diseases (~ id2 ~ viral hepatitis ~).
Injection equipment has therefore been designed to be unusable after single usape: the syringe is mu-0 denies a cylindrical tip ~ rolon ~ é by aiusta ~ e ~ one-se ~ ble being weakly united! while the piston has a prolonseoent q "J. foro ~ pnu-.soir de ~ achnn ~ a, usta ~ e de - the eohcut nt the blocker dsns the mandrel of the needle ~ uille during of ~ 'injection, the enarena ~ e of barbs on the fit and in the cavity of the mandrel makes the needle unusable.
This needle was left unused ~ may however transmit 5 diseases by injection after injection, or accidentelleoont (manipulations by the personnel staff ~ nant or Drepose au nettoieoent) or fortuitoent ~ bite on the-plaps and public places), - the purpose of the present invention is to reshape this inconvenience and proposes for this purpose a serinpuo conoue in such a way that the needle made unusable after usa ~ e can enter the corin of the serin ~ eu formsnt a disposable case after usape.
Any risk of accidental eye damage ~ ','''''. . ~ .`. ", '...... ~'' - '' ~ `` ''''.''';' l "` `` ``
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~ - WO91 / 12841 2 0 7 ~ 8 6 ~ PCT / FR91 / 00154 is then dismissed.
The body of the canine ~ eu is provided at its base with a external cylindrical tip.
According to a characteristic of the invention, this end piece is limited to its end ~ ite by a delimiting rim a cylindrical opening with an inside diameter ~ erement greater than the outside diameter of the mandrel have it. This rim is intended to serve as a stop.
According to another characteristic of the invention tion. the external cylindrical tip has a prolon ~ e ~ ent in-dull equal ~ cylindrical ent, which has slots lon-~ itudinal arranged along the lines of ~ eneratrices.
These slots separate portions of cylindrical surface which form flexible tongues in variable number and é ~ al to that of the slots which delimit and terminate them by er ~ ots. The lugs are characteristic, the longitudinal section of an er ~ ot affects the for ~ e of a tra-peze-rectan ~ ie whose ~ baso exterior line extends the lan ~ uette corresponbante and the small interior base which must be of sufficient dimension is extended by cBt6 most parallel non rand. The most non-parallel dimension small forms a right angle with the lan ~ uette and is intended to serve as a stop. The junction area of the cy-lindrique and lan ~ flexible uettes may include a lé ~ er relief intended to ss ~ urer the seal with the element mobile cylindrical.
According to another characteristic of the invention, 1 emDout external cylindrical and its prolon ~ e ~ ent internal . .
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~ V091 / 12 ~ 1 PCT / FR91 / 00154 receive a hollow cylindrical mobile element whose part distal to the base of the canine ~ supports the cylindrical proximal end of the fit with which it rorme a tight ~ waterproof but weakly united.
The actual cylindrical moving element is consists of two parts:
- The distal part (prlon ~ ee byjusta ~ o) which responds to the opening of the external cylindrical end of the canary ~ eu: its outer diameter is the ~ era ~ ent higher lG to the external diameter of the mandrel of the ai ~ uille. its diameter internal delimits a cylindrical cavity whose diameter is itself slightly higher than the section of the cy-lindrique of adjusta ~ e.
- The proximal part forming the body of the ele-cylindrical movable: its external diameter is slight-ment smaller than the internal diameter of the cylindrical end piece in which it is likely to slide, ~ ais slight-ment greater than the diameter of the rim deli ~ itant the opening of the outer cylindrical end of the canary ~ ue which forms so a stop preventing the displacement of the movable element cylindrical in the posterior anterior direction.
- The middle part of the cylindrical surface of this proximal part supports a rubber seal or 0n flexible plastic intended to perfect ~ 'tightness and which comes in re ~ ard from the relief of the junction zone of the pro-lon ~ ement internal cylindrical with flexible lan ~ uettes.
When the strips are not spread, they ~ slow the joint ensuring otancheite during injection, when they are removed at the end of injection, the seal is ~:. .:,: -. . . . ,::
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WO 91/1

2~1 2 0 7 6 8 6 4 PCT/FR91/00154 libere racilitant ainsi le glisse~ent de l'elément ~obile par rapporl aux languettes La cavite interne de cette partie proxi~ale porte des reliers circulaires ror~ant des barbillons Suivant une autre caracteristique de l'invention, ie proion~eMent cylindrique dont est pourvu le piston a son extremite repondant à la base de la serin~ue est compose de plusieurs parties - Un se~ent jouxtant le piston, de large section - Un ~egment median de section moyenne, portant des barbillons - Un se~ment distal de section fino, ter~ine par des petits barbillons realisant un ~rappin Suivant une autre caracteristiquo de l'invention~
le segment du prolongement jouxtant le piston a une section superieure ou e~ale au diametre e~terne de l'element mobile cylindrique, et une lon~ueur telle que son extrémite aff-leure la base proxioale de l'elémont ~obile cylindriquo lGrs que le piston de la serin~ue est pousoo a bout de course Ce se~ment for~e un epaulement dont extre-ite est carénee de maniere telle que le carena~e et la surface cylindrique de ce se~ment du prolon~e~ont du piston sont susceptibles d'entrer en contact avec la yrande baso libro ot le plus pe-tit des côtes paralleles des er~ots avant qu0 le piston de 2~- la serin~ue ne soit en bout de course, lors de la course du piston de la serin~ue, ce segment de section largo s'onga~e entre les eryots et les lan~uettes flexiblos qu'slle ecarte, la butee formoe par les er~ots est levee et l'éle~-ont ~obile cyllndrique pout se deplacor d'avant en arrioro WO91/128JI ~ v ~ ~ ~ 6 ~ PCT/FR91/00154 , . ...

~ uivant une autre caracteri~tique de l'invention le se~ment median du prolongement du piston a une section lé~erement in~erieure au dia~etre de la cavite de l'ele~ent mobile cylindrique de ~aQon a pouvoir 5 ' y en~ayer et couli-sser ; ce seg~ent a longueur telle que son extre~ito vientbuter contre l'extre~ite proxioale de l'ajustage avant que le piston de la seringue ne soit en bout de course Lorsque le piston de la serin~ue est pousse en bout de course, le segment ~edian for~e poussoir et désolidarise l'ajusta~e de l'element mobile bloque vers l'avant par la butee formee par le rebord de l'extre~ite de l'embout externe Ce se~ment median porte des reliefs circulaires foroant des barbillons destinés a s'engrener dans ceux disposes en sens inverse dont est munie la cavite de l'element ~obile cylindriquo, et 15 D permettro la traotion de celui a lorsqu'il est libero par l'ecartement des ergots et que le piston est tir0 vers l'ar-riere Le segoent median est enfin nervure lon~itudinalement `- de façon a per~ettre l'ecoule-ont du liquide rosiduol lors-que le piston parvient en fin de course Suivant une autre caracteristique de l'invention, le se~ent distal du prolon~ement du piston a une section le~erement inrerieure au diametre du conduit de l'ajustago de faQon a pouvoir s'y enga~er et coulisser, et une lon~ueur - le~erement superieure a celui-ci Ce seg~ent distal est mu-ni à son extrémite de barbillons for~ant co _ o les branches d'un grappin destinees a tirer l'aiguille en arrièro après l'injection lors de la traction du piston Co~me le se~ment median, le se~ont distal est norvure longitudinale~ent pour per~ettre l'ecoulemont do la goutte . .
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,, ' ~' ' , -WO 91/12~1 2 ~ 7 ~ 8 6 ~ Pcr/FR9l/00ls4 . . .

residuelle en fin d'injection Le piston peut co~porter un pas da vis 3ur sa face repondant au bras de piston permettant de devisser celui-ci apres usa2e co~e cela existe sur les seringues à vaccin S Enfin le capuchon protecteur de l'ai~uille peut etre livré
avec un bouchon prevu de façon a s'adapter à l'extremite de l'embout cylindrique de la serin~uo et empecher la sortie de l'aiguille retractee dans le corps de la serin~ue formant boitier 0 Il est bien compris que le principe de la serin~ue à ai~uille retrac~able après usage selon l'invention peut etre mis en oeuvre sur des serin~ues reunissant partielle-ment les ~aracteristiques de la presente invention, par exemple les seringues a faible contenance type serin~ue a insuline ou serin~ue a intra-der~o peuvont pour des raisons de dimensions etre conçues a l'origino non pas avec une ai-~uille adaptable a ~andrin, mais avec une ai~uille ~ontee solidaire de l'element mobile cylindrique, ~onta~o qui per-met de reduire considerablo-ont le diaaètro do l'ouverture de l'embout externe, et de supprimer le se~ent distal du prolon~ement du piston 7 le segmont muni des barbillons assure alors la retraction de l'ai~uille par l'intormodi-aire de l'element cylindrique auquel ello est solidaire L'invention est representee a titre d'exomples non limitatifs sur les sché~as ci-joints dans lesquols ~! - La fi~ure 1 est une vue en coupe axisle scho~atique de la serin~ue selon l'invention avec un a~randissemont partiel de l'extremite de la serin~ue et une coupo frontale selon AA' . ~

~ WO91/12~1 2 ~ ~ 6 8 6 ~ PCT/FR91/00154 .. 7 - La rigure 2 est la vue schematique en coupe axiale, l aerandissement partiel de l~extremite et la coupe fron-tale selon AA' de la meme seringue que sur la figure 1, en rin d in~eciion.
S - La rigure 3 est une vue en coupe axiale schematique de la seringue aux divers stades de l'injection 3a debut d'in-jection! 3b cours de l'injection! 3c fin de l'injection~
3d ! 3e, 3f seringue apres l'injection.
- La rigure ~ est une vue en coupe axiale schematique des elements constituant une seringue selon l'invention.
- Les ~igures 5!6!7 et 8 representent des vues en coupe axiale schematique de deux modes de réalisation de la seringue selon l'invention.

La figure 1 represente une seringue conforme a l'invention vide ou au debut d'une injection : le piston 2 coulisse dans le corps 1 de la seringue qui porte à sa base 3 un embout cylindrique externe 4 dont l'ouverture 5 ~: est limitee par un rebord 6~ cet embout cylindrique externe ~ a un prolongement interne 7 divise par des fentes 8 en languettes fiexibles 9 terminees par des ergots 10 en forme de trapeze rectangle, dont le cote non parallele le plus petit 11 forme une butee! et la petite base 12 est suffi-samment longue et se prolonge par le cote non parallele le plus grand 13. La face interne de la ~acine des languettes flexibles 9 comporte un relief 14 destine a assurer l'etan-cheite avec le joint 15 supporté par l'élement mobile cy-lindrique 16! dont la partie distale 17 a un diametre ex-terne 18 le~erement superieur au diametre externe du mand-rin 13 de l'aiguille~ et un diametre interne legèrement :. - . . .. . -. : - :' .
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wo 91~12841 2 0 7 6 8 ~ 4 PCl~/FR91/00154 superieur a celui de la partie cyiindrique de l'ajustage 20 aui le prolonge. La partie proximale 22 de l'élément mobiie cyiindrique 1~ a un diametre legerement inferieur a celui de l'embout cyiindrique 4-7 dans lequel il coulisse, ce diametre est toutefois superieur a celui du rebord 6.
qui forme une butée immobilisant vers l'avant l'element mobile cylindrique 16 qui est par ailleurs immobilise vers l'arriere par les ergots 10.
La cavite 23 de l'element mobile cylindrique 16 est munie de reliers circulaires formant des barbillons 24.
Le piston 2 est muni d'un prolongement 25 en trois parties 26. 28, 30. Le segment large 26 a une section supe-rieure ou egale au diametre de l'element mobile cylindrique 16~ son extremite porte un carenage 27. Le segment median 28 a une section inferieure au diamètre de la cavité 23 de l'element mobile cylindrique 16 dans laquelle il est suscep-tible de s'engager, il est muni de barbillons 29 suscep- .
tibles de s'engrener dans les barbillons 24 de l'elément mobile cyiindrique 16. Le segment distal 30 a une section inferieure au diametre du conduit de l'ajustage 20 dans lequel il est susceptible de s'engager! il est muni a son extremite de barbillons 31 dont les braches forment un grap-pin.
- La figure 2 represente une seringue conforme a l'invention en fin d'injection : le piston 2 est pousse a bout de course contr0 la base 3 du corps de serin~ue 1.

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. WO9l/12841 PCT/FR91/00154 Le se~ment lar~e 2~ du prolongement du pi~ton 25 a une lon-gueur lelle que son extremite afrieure la base de l'elément mobiie cyiindrique 16! il rorme un epaulement dont l'extre-mite carenee 27 après avoir ete en contact avec les cotes non paralleles les plus grands 13 et les petites bases 12 les ergots 10 les a ecartes par flechissements de~ lan-guettes rlexibles 9 dont les reliefs 1~ qui etranglaient les ioints d'etancheite 15 ont dessere leur etreinte; ainsi i'slement mobile cylindriqua 16 est libere de la butee 11 de l'ergot 1u. Le segment médian ~ du prolongement du pis-ton a couiisse dans la cavite 23 de l'element mobile cylind-rique 16 bioque vers l'avant par la butee formee par le reDord 6 de i'embout externe 4~ la iongueur du segment medi-an 2~ est telle qu'il a rait poussoir et desolidarise l'en-semble ajustage-element mobile cylindrique 20-16, qui etait faiblement solidaire; les barbillons 2g du segment median sont engrenes aux barbillons 24 disposes en sens inverse de la cavite 23 de l'element mobile cylindrique 16. Le segment distal 30 a coulissé dans le conduit de l'ajustage t6, sa 2û longueur est telle que les barbillons 31 forment un grappin terminal depioye au bout de l'ajustage 16.
La rigure 3a represente la seringue conforme a l'invention en debut d'injeotion telle que decrite fi~ure 1.
La figure 3b represente la seringue selon l'inven-tion en cours d'injection : le carena~e 27 du segment large2~ du prolongement du piston abordant le cote non parallele le plus grand 13 et la petite base 12 des ergots 10 qui s'ecartent peu a peu. Le segment médian 28 coulisse dans la cavite 23 de l'element mobile cylindrique 16 et a une lon-,. : : :

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, WO 91/12841 2 0 7 6 8 6 ~ PCrtFR91/00154 i O

queur tell~ qu'il bute contre l'ajusta~e 20 et fait pous-soir.
La riqure 3c represente la serin~ue selon l'inven-tion en rin d'injection telle que decrite figure 2 : le piston 2 touche la base 3 du COrDs de la seringue 1, le se~ment lar~e 26 du prolongement du piston ecarte completement languettes flexibles 3 et er~ots 10 liberant vers l'arriere l'element mobile cylindrique 16 . les reli-efs d'etancheitb 14 s'ecatent des joints 15. Le se~ment lG median 28 a desolidarise l'ensemble ajusta~e-element mo-bile cylindrique 20-16. ses barbiilons 2g sont en~renes aux barbillons 24 de l'element mobile cylindrique 16.
Le seqmenl distal 30 a coulisse bans le conduit de l'ajus-tage 20, ses barbillons terminaux 31 sont deployes au bout ; de l'ajustage.
La figure 3d represente la seringue selon l'inven-tion apres l'injection : l'utilisateur tire en arriere le bras 32 du piston 2, l'importance de la longuour de la pe-tite base 12 de l'ergot 10 empeche celui-ci de s'intercaler entre l'extremite du segment large 26 du prolongement de piston de l'element mobile cylindrique 16 solidarises entre eux par l'en~renage de leurs barbillons respectifs 29 et 24.
ies ergots 10 restent donc ecartes lorsque l'ensemble pro-iongement du piston-element mobile cylindrique 26-t6 est 2~ tire en arriere. Les barbillons 31 qui terminent le segment distal 30 du prolongement du piston tirent en arriere l'a-iusiage 20 casse dans le mandrin 19 de l'aiguille dont le diametre externe est inferieur a celui du rebord 6 de l'ou-verture ~ de l'embout cylindrique externe 4.

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W091/12841 2 ~ 7 6 ~ ~ ~ PCT/FR91/00154 . .

La riqure 3e represente la serin~ue conforme a l'in~
vention apres l'injection lorsque i~utilisateur continue de tirer ie Piston en arriere : l'ensemble prolonge~ent du Diston-eiement mobile cylindrique-aiusta~e-ai~uille 25-16-2u-i5 rentre dans ie corps de la seringue 1.
La rlgure 3r represente ia seringue conTorme a i'in-vention : l'ai~uille completement rentree dans le corps 1 de la serin~ue. le bras du piston 32 est devisse; l'embout cylindrique externe 4 peut recevoir le bouchon 33 du capu-û chon de l'ai~uille.
La fipure 4 represente ies divers elements consti-tutifs de la serin~ue conforme a i'invention : corps de se-rin~ue 1. piston 2 et son prolon~ement 25 en trois parties 2b, ~8~ 30 eiément mobile cylindrique 16 avec son joint d'etancheite 15 et prolon~e par l'ajusta~e 20, bras de pi5-ton -~. La rleche indique le mobe de montage : l'ensemble element mobile cylindrique-ajustage est mis en place par le corps de la serin~ue.
La fi~ure 5 represente un mode de realisation d'une 2û serin~ue conforme a l'invention ou la partie proximale 22 de l'eiement mobile n;est pas cylindrique, mais en tronc de cone à grande base posterieure enchasse 0n foroe dans le prolon~ement interne 7 du cylindre! ce mode de réalisation est susceptible de permettre eventuellemont la suppresision du relier et du joint d'etancheite, ou de parfaire relle-ci s iis sont maintenus.
La figure ~ représente un autre mode de realisation d'une seringue conrorme a l'invention ou l'ajustape 20 est solidaire et inséparable de l'élement mobile cylindrique 16, - - ~ , . .

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~O91/12~1 2 ~ 7 6 8 6 ~ PCT/FR91/00154 ce mode de realisation permet de reduire le prolongement 25 du Diston ~ a deux parties seulement. Le seg~ent large 26 rorme louiours un epaulement tandis que le se8ment 27 devi-ent disla~ el perd son role de poussoir. se~ barbillons 25 des~ines a siengrener aux barbillons 2~ de l'element mobile cylindrique 1~! permettent la traction de l'ensemble pro-longement du piston-element mobile cylindrique-ajustage-aiguille 25-16-20-19.cet ensemble est entierement retrac-table dans le corps de la seringue.
^ Les ri~ures 7a!7b~7c.7d représentent un mode de rea-lisation d'une seringue conforme à l'invention utilisant une aiguille classique ou comme precede~ment figure 6~ l'ajus-tage 2u solidaire de l'element mobile 16. co~porte une par-tie distale 33 qui permet l'adaptation au mandrin de l'aigu-ille ! et une partie proximale 3~ de meme diamètre que la couronne 35 du mandrin. Les languettes flexibles 9 forment un tronc de cone dont la petite base repond a leurs extremi-tes terminées par des ergots dont la rorme est voisine de celle d'un rectangle (figure 7d) : le petit cote anterieur 11 a angle broit avec la languette forme butee. L'autre pe-tit cote 36 est dans un plan parallele au plan de la cou-ronne 35 du mandrin de l'aiguille. Le bord libre de l'ergot a une partie anterieure 37 parallele a la languette et une partie posterieure 33 parallele au mandrin de l'aiquille 2~ ~rig 7d~. Cette disposition rorme une butee dans le sens postero-anterieur est compen~ee par une forne carenee accen-tuee de l'epaulement 26 du prolongement du piston. Ce mode de realisation permet d'avoir une butee retenant la couronne 35 d'une aiguille classique empechant l'ai~uille de ressor-: -. ., :~
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~VO91/12841 2 0 7 6 8 6 ~ PCT/FR91/00154 tir (ri~ur~ 7c) La fiqure ~ represente une seringue selon l'invention ~e pe~iT caliDre~a ultra-dermo ou a insuline). a 'aiquille ,nontee- solidaire de l'element mobile~ les languettes comme _ fiqure / empechent l'ensemble aiguille-element mobile de ressortir. Ce mode de realisatiQn avec aiguille montee per-met une miniaturisation indispensable pour les seringues petit calibre.
Ainsi l'usaae d'une seringue hy~ienique conforme a l invention permet la retraction de l'aiguille dans le CorDs de ia seringue formant boitier, tout risque de pi-qure sePtique est donc ecarte.
Ce materiel est facilement realisable : le moulage du corps de seringue avec e~bout cylindriq-le, tout comme celui du piston avec r,rolongement sont d'une faisabilite et d'un cout semblables a ceux d'une seringue conventionnelle.
Le mouia~e de l'ensemble mobile cylindrique-ajustage n'a-joute aucune difficulte et ne peut apporter qu'un faible sursout.
L'adoption generalisee de materiel a in~ection nvgienique selon l'invention apporterait a peu de frais une contribution consid,erable a l'hygiene et a la preven-tion des maladies trans~ises par piqure septique.

. . ~ " - -., ' ~ ' ' , , 2 ~ 1 2 0 7 6 8 6 4 PCT / FR91 / 00154 liberates thus racilizing the glide ~ ent of the element ~ obile in relation to the tabs The internal cavity of this proxi ~ ale part circular links ror ~ barbels According to another characteristic of the invention, ie proion ~ eMent cylindrical with which the piston has its end answering at the base of the canary ~ eu is composed of multiple parts - A se ~ ent adjoining the piston, large section - A middle section ~ median segment, bearing barbels - A distal segment of fin section, terminated by small barbels realizing a rappin According to another characteristic of the invention ~
the segment of the extension adjoining the piston has a section greater than or equal to the dull diameter of the movable element cylindrical, and a lon ~ ueur such that its extremity aff-the base of the elemont ~ obile cylindriquo lGrs that the piston of the canine ~ eu is pousoo at the end of its travel This se ~ ment for ~ e a shoulder which extre-ite is carénee of so that the carena ~ e and the cylindrical surface of this se ~ ment of the prolon ~ e ~ have the piston are likely to get in touch with the yrande baso libro ot most pe-tit parallel ribs of er ~ ots before qu0 the piston 2 ~ - the cane ~ eu is not at the end of the race, during the race of the piston of the serin ~ eu, this segment of largo section is elongated ~ e between the eryots and lan ~ ui flexiblos qu'slle discards, the stop formoe by the er ~ ots is raised and the ele ~ -are ~ obile cyllndrique pout deplacor avant en arrioro WO91 / 128JI ~ v ~ ~ ~ 6 ~ PCT / FR91 / 00154 ,. ...

~ following another characteristic of the invention the ~ median segment of the piston extension to a section lé ~ erement in ~ erieure to the dia ~ being of the cavity of the ele ~ ent cylindrical mobile of ~ aQon has power 5 'y ~ ayer and couli-sser; this seg ~ ent to length such that its extre ~ ito justbuter against the extre ~ ite proxioale of the adjustment before the syringe plunger is at the end of its travel When the piston of the canine ~ ue is pushed at the end of its travel, the segment ~ edian for ~ e push and disconnects the adjusta ~ e from the movable element blocks forwards by the stop formed by the rim of the extreme ~ ite of the external end piece median wears circular reliefs forcing barbels intended to mesh with those arranged in opposite directions which is provided with the cavity of the element ~ obile cylindriquo, and 15 D will allow the trauma of the one when he is freed by the spacing of the lugs and that the piston is pulled backward riere The segoent median is finally rib lon ~ itudinally `- in order to per ~ ettre the flow-have rosiduol liquid during-that the piston reaches the end of the stroke According to another characteristic of the invention, the se ~ ent distal of the prolon ~ ement of the piston has a section the ~ erement inner to the diameter of the adjustago so as to be able to engage there and slide, and a long - the ~ erement superior to this This distal seg ~ ent is mu-nor to its extremity of barbs for ~ ant co _ o the branches of a grapple intended to pull the needle backwards after injection when pulling the piston Like the median segment, the distal segment is norvure longitudinal ~ ent to per ~ be the ecoulemont do the drop . .
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residual at the end of injection The piston can co ~ wear a pitch da screw 3 on its face responding to the piston arm allowing it to be unscrewed after usa2e co ~ e this exists on vaccine syringes S Finally the protective cap of the needle can be delivered with a stopper provided so as to adapt to the end of the cylindrical end of the canary ~ uo and prevent the exit of the needle retracted into the body of the canary ~ eu forming housing 0 It is well understood that the principle of serin ~ ue to ai ~ uille retrac ~ able after use according to the invention can be implemented on serins ~ ues partially reuniting-the ~ aracteristics of the present invention, by example syringes with a low capacity, serine type ~ ue a insulin or serine ~ intra-der ~ o can for reasons dimensions to be designed originally not with ai-~ uille adaptable to ~ andrin, but with a ai ~ uille ~ ontee integral with the cylindrical mobile element, ~ onta ~ o which per-puts to reduce considerablo-have the opening diaaètro the external tip, and to remove the distal ~ ent prolon ~ ement of the piston 7 the segmont provided with barbels then ensures retraction of the needle by intormodi-area of the cylindrical element to which ello is attached The invention is represented as examples not limitative on the sché ~ aces enclosed in which ~! - The fi ~ ure 1 is a schematic ~ axisle sectional view of the canary ~ eu according to the invention with a randissemont a partial of the end of the line and a frontal coupo according to AA ' . ~

~ WO91 / 12 ~ 1 2 ~ ~ 6 8 6 ~ PCT / FR91 / 00154 .. 7 - Figure 2 is the schematic view in axial section, partial enlargement of the extremity and the front cut tale along AA 'of the same syringe as in FIG. 1, in rin d in ~ eciion.
S - Figure 3 is a schematic axial sectional view of the syringe at the various stages of the injection 3a start of information jection! 3b during the injection! 3c end of injection ~
3d! 3rd, 3f syringe after injection.
- La rigure ~ is a schematic axial section view of elements constituting a syringe according to the invention.
- The ~ igures 5! 6! 7 and 8 represent sectional views schematic axial of two embodiments of the syringe according to the invention.

Figure 1 shows a syringe conforming to the invention empty or at the start of an injection: the piston 2 slides in the body 1 of the syringe which brings to its base 3 an external cylindrical tip 4 whose opening 5 ~: is limited by a rim 6 ~ this external cylindrical tip ~ has an internal extension 7 divided by slots 8 in flexible tabs 9 terminated by lugs 10 in the form of trapezoid rectangle, the most non-parallel dimension of which petit 11 is a stop! and the small base 12 is sufficient long enough and extended by the non-parallel side greater 13. The internal face of the ~ acine of the tongues flexible 9 has a relief 14 intended to ensure the socket with seal 15 supported by the movable element cy-lindrique 16! whose distal part 17 has a diameter ex-dull 18 ~ significantly higher than the external diameter of the mand-needle rinse 13 and a slightly inner diameter :. -. . ... -. : -: '.
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wo 91 ~ 12841 2 0 7 6 8 ~ 4 PCl ~ / FR91 / 00154 higher than that of the cylindrical part of the adjustment 20 aui extends it. The proximal part 22 of the element cylindrical mobiie 1 ~ to a diameter slightly less than that of the cylindrical tip 4-7 in which it slides, this diameter is however greater than that of the rim 6.
which forms a stop immobilizing the element forward cylindrical mobile 16 which is also immobilized towards the rear by the pins 10.
The cavity 23 of the cylindrical mobile element 16 is provided with circular connections forming barbels 24.
The piston 2 is provided with an extension 25 in three parts 26. 28, 30. The wide segment 26 has a higher section greater than or equal to the diameter of the cylindrical movable element 16 ~ its end carries a fairing 27. The middle segment 28 has a section smaller than the diameter of the cavity 23 of the cylindrical movable element 16 in which it is sus-tible to engage, it is provided with barbs 29 suscep-.
tibles to mesh with the barbels 24 of the element mobile cyiindrique 16. The distal segment 30 has a section smaller than the diameter of the fitting duct 20 in which he is likely to commit! he has his end of barbels 31 whose braches form a grap-pine.
- Figure 2 shows a syringe conforming to the invention at the end of injection: the piston 2 is pushed to limit switch contr0 the base 3 of the canary body ~ eu 1.

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. WO9l / 12841 PCT / FR91 / 00154 The se ~ ment lar ~ e 2 ~ of the extension of the pi ~ ton 25 has a lon-dearly that its lower end at the base of the element cylindrical mobiie 16! he drowns a shoulder whose ex-mite carenee 27 after being in contact with the dimensions larger 13 and smaller bases 12 the lugs 10 the apart by deflections of ~ lan-flexible lookouts 9 including the reliefs 1 ~ which constricted the ioints of sealing 15 have loosened their embrace; so i'slement mobile cylindriqua 16 is released from stop 11 1u ergot. The middle segment ~ of the extension of the pis-tone a couiisse in the cavity 23 of the movable element cylind-rique 16 bioque forward by the stop formed by the reDord 6 of the external tip 4 ~ the length of the medial segment year 2 ~ is such that it has a push and disengages the seems adjustment-movable cylindrical element 20-16, which was weakly united; 2g barbels of the median segment are meshed with the barbs 24 arranged in opposite direction to the cavity 23 of the cylindrical movable element 16. The segment distal 30 has slid in the adjustment duct t6, its 2. length is such that the barbs 31 form a grapple terminal depioye after adjustment 16.
Figure 3a shows the syringe conforming to the invention at the start of injeotion as described fi ~ ure 1.
Figure 3b shows the syringe according to the invention.

tion during injection: the carena ~ e 27 of the large segment2 ~ of the piston extension approaching the non-parallel side the largest 13 and the small base 12 of the pins 10 which gradually move away. The middle segment 28 slides in the cavity 23 of the cylindrical movable element 16 and has a long ,. :::

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, WO 91/12841 2 0 7 6 8 6 ~ PCrtFR91 / 00154 i o queur tell ~ he stumbles against the adjusta ~ e 20 and pushes evening.
Line 3c represents the serine according to the invention.
injection rinse as described in Figure 2: the piston 2 touches the base 3 of the COrDs of syringe 1, the se ~ ment lar ~ e 26 of the extended piston gap fully flexible tabs 3 and er ~ ots 10 liberant towards the rear, the cylindrical mobile element 16. reli-sealing efs 14 seals joints 15. The se ~ ment LG median 28 has separated the adjusted assembly ~ e-element mo-cylindrical bile 20-16. his 2g barbiilons are in ~ renes to the barbs 24 of the cylindrical mobile element 16.
The distal seqmenl 30 has slides in the nozzle duct.
stage 20, its terminal barbels 31 are deployed at the end ; of adjustment.
Figure 3d shows the syringe according to the invention.
tion after injection: the user pulls back the arm 32 of piston 2, the importance of the length of the tite base 12 of lug 10 prevents it from being inserted between the end of the wide segment 26 of the extension of piston of the cylindrical mobile element 16 secured between them by the ~ renage of their respective barbels 29 and 24.
the pins 10 therefore remain apart when the assembly pro-ionization of the piston-cylindrical mobile element 26-t6 is 2 ~ pulls back. The barbels 31 which end the segment distal 30 of the piston extension pull back a-iusiage 20 breaks in the mandrel 19 of the needle, the outer diameter is less than that of edge 6 of the verture ~ of the external cylindrical end piece 4.

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W091 / 12841 2 ~ 7 6 ~ ~ ~ PCT / FR91 / 00154 . .

The riqure 3e represents the serine ~ ue conforms to the in ~
vention after injection when i ~ user continues to pull the piston back: the assembly extends ~ ent from Diston-eiement mobile cylindrique-aiusta ~ e-ai ~ uille 25-16-2u-i5 enters the body of syringe 1.
The line 3r represents the syringe consistent with the note: the needle completely entered the body 1 of the serin ~ eu. the arm of the piston 32 is unscrewed; the mouthpiece external cylindrical 4 can receive the cap 33 of the capu-û chon de ai ~ uille.
Figure 4 represents the various elements tutifs of the serin ~ ue according to the invention: body of se-rin ~ eu 1. piston 2 and its extension ~ ement 25 in three parts 2b, ~ 8 ~ 30 cylindrical mobile element 16 with its seal seal 15 and extended by the adjust ~ 20, pi5 arm your - ~. The arrow indicates the assembly mobe: the assembly cylindrical-fitting movable element is put in place by the canine body ~ eu.
The fi ~ ure 5 represents an embodiment of a 2û serin ~ ue according to the invention or the proximal part 22 of the mobile element is not cylindrical, but in trunk of cone with large posterior base frame 0n foroe in the prolon ~ ement internal 7 of the cylinder! this embodiment is likely to allow eventual removal to connect and seal, or to perfect it if they are maintained.
Figure ~ shows another embodiment of a syringe conforming to the invention or the adjustape 20 is integral with and inseparable from the cylindrical mobile element 16, - - ~,. .

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~ O91 / 12 ~ 1 2 ~ 7 6 8 6 ~ PCT / FR91 / 00154 this embodiment makes it possible to reduce the extension 25 of Diston ~ has only two parts. The wide segment 26 rorme louiours a shoulder while the se8ment 27 devi-ent disla ~ el loses its role of pusher. se ~ barbillons 25 ~ ines a siengrener to barbels 2 ~ of the mobile element cylindrical 1 ~! allow the traction of the whole pro-length of the piston-cylindrical mobile element-adjustment-needle 25-16-20-19. this set is fully retrac-table in the body of the syringe.
^ The ri ~ ures 7a! 7b ~ 7c.7d represent a mode of rea-reading of a syringe according to the invention using a conventional needle or as above ~ ment Figure 6 ~ the adjus-2u stage integral with the movable element 16. co ~ carries a par-distal tie 33 which allows adaptation to the chuck of the acute ille! and a proximal part 3 ~ of the same diameter as the crown 35 of the mandrel. The flexible tabs 9 form a cone trunk whose small base meets their ends your ends with pins whose rorme is close to that of a rectangle (figure 7d): the small anterior dimension 11 at an angle grinds with the stop-shaped tongue. The other pe-tit dimension 36 is in a plane parallel to the plane of the cou-line 35 of the needle mandrel. The free edge of the lug has an anterior portion 37 parallel to the tongue and a posterior part 33 parallel to the mandrel of the needle 2 ~ ~ rig 7d ~. This arrangement is a stop in the sense postero-anterior is compensated by a streamlined fairing killed by the shoulder 26 of the piston extension. This mode of realization allows to have a stop retaining the crown 35 of a conventional needle preventing the ~ spring needle : -. .,: ~
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~ VO91 / 12841 2 0 7 6 8 6 ~ PCT / FR91 / 00154 shot (ri ~ ur ~ 7c) The fiqure ~ represents a syringe according to the invention ~ e pe ~ iT caliDre ~ ultra dermo or insulin). needle , nontee- integral with the mobile element ~ the tongues as _ screw / prevent the needle-movable element assembly from stand out. This embodiment with needle mounted per-puts miniaturization essential for syringes small caliber.
So the usae of a compliant hy ~ ienique syringe al invention allows retraction of the needle in the CorDs of the syringe forming a housing, any risk of some sePtic is therefore discarded.
This material is easily achievable: molding syringe body with e ~ cylindriq tip, just like that of the piston with r, extension are feasible and cost similar to that of a conventional syringe.
The mouia ~ e of the cylindrical-fitting mobile assembly has-joust no difficulty and can only bring a weak especially.
Widespread adoption of materials for inection nvgienique according to the invention would bring inexpensively a considerable contribution to hygiene and prevention tion of diseases trans ~ ised by septic bite.

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Claims

1) Hygienic syringe designed to per-put the retraction of the needle in the body of se-ring forming a disposable box after use, characteristics is in that the cylindrical end piece 4 at the base 3 of the body syringe 1 has a cylindrical internal extension 7 provided longitudinal slots 8 separating surface portions cylindrical which form flexible tabs 9 terminated by lugs 10 forming abutment; in that this end piece 4 and its internal extension 7 terminated in tabs 9, receives wind a cylindrical movable element 16 (or partially cylindrical lindrical and partially conical) in diameter slightly lower and able to slide therein, this movable element hollow 16 supports fitting 20 at its end, its cavity 23 is provided with circular reliefs forming barbs 24; in that the extension 25 of the piston 2 is composed of at least two parts: a part of largo section 26, a part of narrower section 28; in that the part 26 of the extension of the piston 2 forms a streamlined shoulder at its end 27 and of greater or equal wide section to the external diameter of the mobile element 16, and of length such that its end is flush with the latter when the pis-tone 2 is at the end of its course, this shoulder 26 is suscep-tible to engage between the various lugs 10 and tabs 9 of the internal extension 7, to separate them raise the stop they form and ultimately allow traction towards the rear of the movable element 16; in that the part more narrow 28 of the extension of the piston 2 has a lower section smaller than the diameter of the cavity 23 of the movable element 16 where it is likely to engage and slide, the surface of this part 28 also bears barbels 29 capable of meshing with the barbs 24 of the element mobile 16 arranged in opposite direction, and to allow final-ment the rearward traction of the movable element 16 and of its possible adjoining parts according to the mode of realization.

2) Syringe according to claim 1 character-ridiculous in that the outer cylindrical endpiece 4 has its end a cylindrical opening 5 bounded by a rim 6 tooth the diameter is greater than that of the chuck 19 of the needle.

3) Syringe according to claims 1 and 2 characterized in that the lugs 10 have in section the shape of a trapeze-retangle whose large base extends the watches 9 of the internal extension 7, the small base 12 of fairly large dimension extends the largest of the sides non-parallel 13, and whose smallest non-parallel side 11 at right angles to tongue 9 forms an internal abutment eure at the end of each tab 9 preventing the dep-lacing of the movable element 16 backwards during the in-jection, the lifting of this stop by the shoulder 26 of the pro-piston extension rearwardly releases the movable element 16 at the end of the injection. Dewclaws may still have a shape close to a rectangle whose small side post-laughing is in a plane parallel to the plane of the crown of the mandrel of the needle forming a stop, intended to retain the needle; the large free side of the lug has a part posterior parallel to the needle chuck.

4) Syringe according to claims 1,2,3 charac-ized in that the base of the flexible tabs 9 comprises bear on their inner race a relief 14 corresponding to a flexible seal located on the cylindrical surface (or co-nic) of the mobile element and intended to ensure perfect sealing.

5) Syringe according to claims 1,2,3,4 characterized in that the movable element-adjustment assembly 16-20 is watertight but weakly attached; in that the ring 28 of the extension of the piston at lower section to the diameter of the cavity 23 of the movable element 16, is length such that its end abuts the fitting 20 before the piston is at the end of its stroke and pushes ssoir dissociating the weakly united assembly mobile-adjustment 16-20; in that this segment 28 supports te an extension of thin section constituting a third ring 30 to piston extension 25; in that the sec-tion of this segment 30 is less than the diameter of the duct adjustment 20 where it is likely to engage and cou-smooth, and that it is provided at its extremity with barbels 31 forming like the branches of a grappling hook intended to pull rear adjustment 20 blocked in the needle chuck 19.