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WO1991012841A1 - Syringe with retractable needle - Google Patents

Syringe with retractable needle Download PDF

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Publication number
WO1991012841A1
WO1991012841A1 PCT/FR1991/000154 FR9100154W WO9112841A1 WO 1991012841 A1 WO1991012841 A1 WO 1991012841A1 FR 9100154 W FR9100154 W FR 9100154W WO 9112841 A1 WO9112841 A1 WO 9112841A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylindrical
extension
piston
syringe
movable element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/FR1991/000154
Other languages
French (fr)
Inventor
Patrice Elfandi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO1991012841A1 publication Critical patent/WO1991012841A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston

Definitions

  • the invention relates to a syringe.
  • a conventional syringe has a cylindrical body in which a piston slides and the base of which carries an adjustment on which the mandrel of a needle fits.
  • the syringe and needle should in principle be discarded - after single use; however, they may be re-used and spread diseases (AIDS, viral hepatitis B).
  • Injection equipment has therefore been designed to be unusable after single use: the syringe is provided with a cylindrical tip orolonqé by the adjustment, the assembly seems to be weakly secured . , while the piston has a projection which forms a pusher detaching the adjustment of the endpiece and blocking it in the mandrel of the needle during ⁇ ⁇ 'injection,!' gear of barbs on the adjustment and in the cavity of the mandrel makes the needle unusable.
  • This needle made unusable can however transmit diseases by injection after injection, either accidentally (manipulations by nursing staff or cleaning worker) or accidentally (injection on beaches and public places).
  • the object of the present invention is to remedy this drawback and to this end provides a syringe designed in such a way that the needle made unusable after use can enter the coros of the syringe forming a disposable container after use.
  • The. syringe body is provided at its base with an external cylindrical tip.
  • this nozzle is limited at its end by a rim defining a cylindrical opening whose internal diameter is slightly greater than the external diameter of the mandrel of the needle.
  • This rim is intended to serve as a stop.
  • the external cylindrical end piece has an internal cylindrical extension which also has longitudinal slots arranged along the lines of the generators. These slots separate portions of cylindrical surface which form flexible tongues in variable number and equal to that of the slots which delimit them and terminated by lugs.
  • the lugs are characteristic, the longitudinal section of a lug affects the shape of a rectangular trapezoid whose large external base extends the corresponding tongue and the small internal base which must be of sufficient size is extended by the non-parallel side the greatest. The smaller non-parallel side forms a right angle with the tongue and is intended to serve as a stop.
  • the junction zone of the cylindrical extension and the flexible tongues may have a slight relief intended to ensure sealing with the cylindrical movable element.
  • the external cylindrical end piece and its internal extension receive a hollow cylindrical movable element, the part of which distends relative to the base of the syringe supports the cylindrical proximal end of the fitting with which it forms a tight but weakly integral assembly.
  • the actual cylindrical movable element consists of two parts:
  • the distal part which responds to the opening of the external cylindrical tip of the syringe: its external diameter is slightly greater than the external diameter of the mandrel of the needle, its internal diameter defines a cylindrical cavity the diameter of which is itself slightly greater than the section of the cylindrical part of the adjustment.
  • the proximal part forming the body of the cylindrical mobile element its external diameter is slightly less than the internal diameter of the cylindrical end piece in which it is capable of sliding, but slightly greater than the diameter of the delimiting rim the opening of the external cylindrical tip of the syringe which therefore forms a stop preventing the displacement of the mobile cylindrical element in the posterior anterior direction.
  • the cylindrical extension with which the piston is provided at its end corresponding to the base of the syringe is composed of several parts:
  • the extension segment adjoining the piston has an upper section or equal to the external diameter of the cylindrical mobile element, and a length such that its end aff ⁇ ries the proximal base of the mobile element cylindrical when the syringe plunger is pushed to the end of its travel.
  • This segment forms a shoulder, the end of which is faired in such a way that the fairing and the cylindrical surface of this segment of the extension of the piston are capable of coming into contact with the large free base and the smallest of the parallel sides of the front pins.
  • the median segment of the extension of the piston has a section slightly smaller than the diameter of the cavity of the cylindrical movable element so as to be able to engage and slide therein; this segment has a length such that its end abuts against the proximal end of the adjustment before the syringe piston is at the end of its travel.
  • the median segment When the syringe plunger is pushed to the end of its travel, the median segment forms a plunger and separates the adjustment of the movable element blocked forwards by the stop formed by the rim of the end of the external endpiece.
  • This median segment carries circular reliefs forming barbs intended to mesh with those arranged in opposite direction which is provided with the cavity of the cylindrical movable element, and to allow the traction of that when it is released by the spacing lugs and that the piston is pulled back.
  • the median segment is finally rib longitudinally so as to allow the flow of residual liquid when the piston reaches the end of the stroke.
  • the distal segment of the extension of the piston has a cross section slightly less than the diameter of the adjustment duct so as to be able to engage and slide therein, and a length slightly greater than the latter.
  • This distal segment is provided at its end with barbs forming like the branches of a grapple intended to pull the needle back after the injection when the piston is pulled.
  • the distal segment is longitudinally ribbed to allow the flow of the drop residual at the end of injection.
  • the plunger may have a thread on its face corresponding to the • plunger arm making it possible to unscrew the latter after use, as exists on vaccine syringes.
  • 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 syringe and prevent the exit of the retracted needle into the body of the syringe forming housing.
  • syringes with low capacity such as insulin syringe or Intra-dermo syringe
  • syringes with low capacity such as insulin syringe or Intra-dermo syringe
  • syringes with low capacity such as insulin syringe or Intra-dermo syringe
  • FIG. 1 is a schematic axial sectional view of the syringe according to the invention with a partial enlargement of the end of the syringe and a front section along ⁇ ' - Figure 2 is the schematic view in axial section, the partial enlargement of the end and the fron ⁇ tale section along AA 'of the same syringe as in Figure 1, at the end of injection.
  • - Figure 3 is a schematic axial sectional view of the syringe at the various stages of injection 3a start of injection, 3b during injection, 3c end of injection, 3d, 3e, 3f syringe after injection.
  • FIG. 4 is a schematic axial sectional view of the elements constituting a syringe according to the invention.
  • Figure 1 shows a syringe according to the invention empty or at the start of an injection: the piston 2 slides in the body 1 of the syringe which carries at its base 3 an external cylindrical tip 4 whose opening 5 is limited by a rim 6, this external cylindrical end piece 4 has an internal extension 7 divided by slots 3 in flexible tabs 9 terminated by lugs 10 in the shape of a rectangular trapezoid, the smallest non-parallel side 1 of which forms a stop, and the , small base 12 is suffi ⁇ ciently long and is extended by the larger non-parallel side 13.
  • the internal face of the root of the flexible tongues 9 has a relief 14 intended to ensure the seal with the seal 15 supported by the 'mobile cylindrical element 16, the distal part 17 of which has an external diameter 18 slightly greater than the external diameter of the needle mandrel 1 "and an internal diameter slightly greater than that of the cylindrical part of the adjustment 20 which extends it.
  • the proximal part 22 of the cylindrical movable element 16 has a diameter slightly less than that of the cylindrical end piece 4-7 in which it slides, this diameter is however greater than that of the rim 6, which forms a stop immobilizing towards the before the cylindrical movable element 16 which is moreover immobilized towards the rear by the pins 10.
  • the cavity 23 of the cylindrical movable element 16 is provided with circular reliefs forming barbs 24.
  • the piston 2 is provided with an extension 25 in three parts 26, 28, 30.
  • the wide segment 26 has a upper section or equal to the diameter of the cylindrical movable element 16, its end carries a fairing 27.
  • the median segment 28 has a cross section smaller than the diameter of the cavity 23 of the cylindrical movable element 16 in which it is likely to engage , it is provided with barbs 29 which are likely to mesh with the barbs 24 of the cylindrical movable element 16.
  • the distal segment 30 has a cross section smaller than the diameter of the fitting duct 20 in which it is likely to s 'engage, it is provided at its end with barbs 3i whose braches form a grap ⁇ pin.
  • FIG. 2 represents a syringe according to the invention at the end of injection: the piston 2 is pushed at the end of its travel against the base 3 of the syringe body 1.
  • the wide segment 26 of the extension of the piston 25 has a length such that its end is flush with the base of the cylindrical movable element 16, it forms a shoulder, the faired end of which 27 after being in contact with the sides not the largest 13 and the small bases 12 parallel the lugs 10 have separated them by flexing flexible lan ⁇ guettes 9 whose reliefs 14 which throttled the seals 15 have released their grip; thus the cylindrical movable element 16 is released from the stop 11 of the lug 10.
  • the distal segment 30 has slid in the adjustment duct 16, its length is such that the barbs 31 form a terminal grapple deployed at the end of the fitting 16.
  • Figure 3a shows the syringe according to the invention at the start of injection as described in Figure 1.
  • Figure 3b shows the syringe according to the invention during injection: the fairing 27 of the wide segment 26 of the extension of the piston approaching the larger non-parallel side 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 an ion gueur as it abuts against the adjustment 20 and makes pous ⁇ evening.
  • FIG. 3c represents the syringe according to the invention at the end of injection as described in FIG. 2: the plunger 2 touches the base 3 of the body of the syringe 1, the wide segment 26 of the extension of the plunger deviates completely flexible tongues 9 and lugs 10 releasing the cylindrical movable element 16 towards the rear, the * reli ⁇ sealing efs i4 collide with the seals 15.
  • the middle segment 28 has separated the adjustment assembly — cylindrical mo ⁇ bile element 20-16 , its barbs 29 are meshed with the barbs 24 of the cylindrical mobile element 16.
  • the distal segment 30 has slid in the duct of the nozzle 20, its terminal barbs 31 are deployed at the end of the adjustment.
  • Figure 3d shows the syringe according to the invention after the injection: the user pulls back the arm 32 of the piston 2, the importance of the length of the small base 12 of the lug 10 prevents that -ci to be inserted between the end of the wide segment 26 of the piston extension of the cylindrical movable element i6 secured to each other by the gear of their respective barbs 29 and 24. the lugs iO therefore remain separated when the assembly extension of the piston-cylindrical movable member 26-16 is pulled back.
  • the barbs 31 which terminate the distal segment 30 of the extension of the piston pull back the snap 20 broken in the mandrel 19 of the needle whose external diameter is less than that of the rim 6 of the opening 5 of the external cylindrical end piece 4.
  • 3e represents the syringe according to the invention after the injection when the user continues to pull the piston back: the extension assembly of the piston-cylindrical movable element-adjustment-needle 25-16-20-19 fits into the body of the syringe 1.
  • FIG. 3f shows the syringe according to the invention: the needle completely retracted into the body 1 of the syringe, the arm of the piston 32 is unscrewed; the external cylindrical endpiece 4 can receive the plug 33 of the needle cap.
  • FIG. 4 represents the various constituent elements of the syringe according to the invention: body of ring 1, piston 2 and its extension 25 in three parts 26, 28, 30 cylindrical movable element 16 with its seal 15 and extended by the adjustment 20, pis ⁇ ton arm 32.
  • the arrow indicates the mounting method: the cylindrical movable element-adjustment assembly is put in place by the body of the syringe.
  • FIG. 5 shows an embodiment of a syringe according to the invention in which the proximal part 22 of the movable element is not cylindrical, but in a truncated cone with a large posterior base embedded in force in the internal extension 7 of the cylinder, this embodiment may optionally allow deletion relief and seal, or perfect thereof if they are maintained.
  • FIG. 6 represents another embodiment of a syringe according to the invention where the adjustment 20 is integral and inseparable from the cylindrical movable element 16, this embodiment makes it possible to reduce the extension 25 of the piston 2 to only two parts.
  • the wide segment 26 always forms a shoulder while the segment 27 becomes distal and loses its role as a pusher, its barbs 29 intended to mesh with the barbs 24 of the cylindrical mobile element 16, allow the traction of the assembly extension of the piston-moving element cyiindrique-adjustment-aiguiiie 25-16-20-19, this assembly is entirely retrac ⁇ table in the body of the syringe.
  • the adjusage 20 secured to the movable element i6 comprises a distilled part 33 which allows adaptation to the mandrel of the needle, and a proximal part 34 of the same diameter as the crown 35 of the mandrel.
  • the flexible tongues 9 form a truncated cone whose small base responds to their extremi ⁇ tees terminated by lugs the shape of which is close to that of a rectangle (FIG. 7d): the small anterior side li at right angles to the tongue stop form.
  • the other side pe ⁇ tit 36 is in a plane parallel to the plane of the crown 35 of the mandrel of the needle.
  • the free edge of the lug has a front part 37 parallel to the tongue and a rear part 38 parallel to the mandrel of the needle, (fig 7d).
  • This arrangement forms a stop in the postero-anterior direction is compensated by a streamlined shape accen ⁇ killed by the shoulder 26 of the extension of the piston.
  • This embodiment makes it possible to have a stop retaining the crown 35 of a conventional needle preventing the needle from coming out again. shooting (Tigure / c)
  • FIG. 8 represents a syringe according to the invention of small gauge (uitra-dermo or insulin), with "needle mounted” secured to the movable element; the tabs as 5 in FIG. 7 prevent the needle-movable assembly from coming out.
  • This embodiment with needle mounted per ⁇ puts miniaturization essential for small caliber syringes.
  • a hygienic syringe according to -, C to the invention allows the retraction of the needle in the body of the syringe forming a housing, any risk of pi ⁇ septic qûre is ruled out.
  • the molding of the syringe body with a cylindrical esehout, like that of the plunger with an extension, is of similar feasibility and cost as that of a conventional syringe.
  • the moulaq ⁇ of the cylindrical-fitting mobile assembly does not add any difficulty and can only bring a small additional cost.
  • the widespread adoption of hygienic injection equipment according to the invention would make a considerable contribution to hygiene and to the prevention of diseases transmitted by septic injection at low cost.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

The syringe has an end piece (4) with flexible tabs (9) extending inward and terminated by lugs (10). A hollow mobile element (16) with nozzle (20) attached in a moderately firm manner at its end can slide between the tabs. It is stopped at the rear by lugs (10), and its cavity (23) features ridges (24). The piston (2) has an extension comprising several parts: a smooth wide segment (26) can engage the lugs (10), a segment (28) with ridges (29) can slide into the cavity (23). When the piston (2) reaches the end of its travel, it pushes and releases nozzle (20) from the mobile element (16) enabling a segment (30) fitted with barbs (31) to slide into the passage of nozzle (20). After the injection has been made, the segment (26) separates the lugs (10) and releases mobile element (16) to the rear. Ridges (29 and 24) and engagement of barbs (31) with nozzle (20) ensure that the mobile element-nozzle-holder assembly (16, 20, 19) and the needle are pulled back into the syringe by the piston.

Description

Seringue à aiguille rétractable. Syringe with retractable needle.

L'invention concerne une seringue. Une seringue conventionnelle a un corps cylind¬ rique dans ieαuel coulisse un piston et dont la base porte un ajustage sur lequel s'adapte le mandrin d'une aiguille. Seringue et aiguille doivent en principe être jetées- après usage unique ; il arrive cependant qu'elles soient rè—utili¬ sées et propagent des maladies (Sida, hépatite virale B) .The invention relates to a syringe. A conventional syringe has a cylindrical body in which a piston slides and the base of which carries an adjustment on which the mandrel of a needle fits. The syringe and needle should in principle be discarded - after single use; however, they may be re-used and spread diseases (AIDS, viral hepatitis B).

Un matériel à injection a donc été conçu pour être inutilisable après usage unique : la seringue est mu- nie d'un embout cylindrique orolonqé par l'ajustage, l'en¬ semble étant faiblement solidaire., tandis que le piston a un proionçement qui forme poussoir détachant l'ajustage de l'embout et le bloquant dans le mandrin de l'aiguille lors de ~\ 'injection,!'engrenage de barbillons sur l'ajustage et dans îa cavité du mandrin rend l'aiguille inutilisable.Injection equipment has therefore been designed to be unusable after single use: the syringe is provided with a cylindrical tip orolonqé by the adjustment, the assembly seems to be weakly secured . , while the piston has a projection which forms a pusher detaching the adjustment of the endpiece and blocking it in the mandrel of the needle during ~ \ 'injection,!' gear of barbs on the adjustment and in the cavity of the mandrel makes the needle unusable.

Cette aiguille rendue inutilisable peut cependant transmettre les maladies par piqûre après injection, soit accidentellement (manipulations par le personnel soignant ou préposé au nettoiement) soit fortuitement (piqûre sur les plages et lieux publics).This needle made unusable can however transmit diseases by injection after injection, either accidentally (manipulations by nursing staff or cleaning worker) or accidentally (injection on beaches and public places).

La présente invention a pour but de remédier à cet inconvénient et propose à cet effet une seringue conçue de manière telle que l'aiguille rendue inutilisable après usage puisse rentrer dans le coros de la seringue formant un boitier jetable après usage.The object of the present invention is to remedy this drawback and to this end provides a syringe designed in such a way that the needle made unusable after use can enter the coros of the syringe forming a disposable container after use.

Tout risque de piαύre septique. même fortuite est alors écarte.Any risk of septic damage. even fortuitous is then discarded.

Le. corps de la seringue est munie à sa base d'un embout cylindrique externe.The. syringe body is provided at its base with an external cylindrical tip.

Suivant une caractéristique de l'invention, cet embout est limité à son extrémité par un rebord délimitant une ouverture cylindrique dont le diamètre intérieur est légèrement supérieur au diamètre extérieur du mandrin de l'aiguille. Ce rebord est destiné à servir de butée.According to a characteristic of the invention, this nozzle is limited at its end by a rim defining a cylindrical opening whose internal diameter is slightly greater than the external diameter of the mandrel of the needle. This rim is intended to serve as a stop.

Suivant une autre caractéristique de l'inven- tion, l'embout cylindrique externe a un prolongement in¬ terne également cylindrique, qui comporte des fentes lon¬ gitudinales disposées selon les lignes des génératrices. Ces fentes séparent des portions de surface cylindrique qui forment des languettes flexibles en nombre variable et égal à celui des fentes qui les délimitent et terminées par des ergots. Les ergots sont caractéristiques, la coupe longitudinale d'un ergot affecte la forme d'un tra¬ pèze-rectangle dont la grande base extérieure prolonge la languette correspondante et la petite base intérieure qui doit être de dimension suffisante est prolongée par le côté non parallèle le plus grand. Le côté non parallèle le plus petit forme un angle droit avec la languette et est destiné à servir de butée. La zone de jonction du prolongement cy¬ lindrique et des languettes flexibles peut comporter un léger relief destiné à assurer i'étanchéité avec l'élément mobile cylindrique.According to another characteristic of the invention, the external cylindrical end piece has an internal cylindrical extension which also has longitudinal slots arranged along the lines of the generators. These slots separate portions of cylindrical surface which form flexible tongues in variable number and equal to that of the slots which delimit them and terminated by lugs. The lugs are characteristic, the longitudinal section of a lug affects the shape of a rectangular trapezoid whose large external base extends the corresponding tongue and the small internal base which must be of sufficient size is extended by the non-parallel side the greatest. The smaller non-parallel side forms a right angle with the tongue and is intended to serve as a stop. The junction zone of the cylindrical extension and the flexible tongues may have a slight relief intended to ensure sealing with the cylindrical movable element.

Suivant une autre caractéristique de l'invention, 1'embout cylindrique externe et son prolongement interne reçoivent un élément mobile cylindrique creux dont la partie distaie par rapport à la base de la seringue supporte l'extrémité proximale cylindrique de l'ajustage avec lequel il forme un ensemble étanche mais faiblement solidaire. L'élément mobile cylindrique proprement dit est constitué de deux parties :According to another characteristic of the invention, the external cylindrical end piece and its internal extension receive a hollow cylindrical movable element, the part of which distends relative to the base of the syringe supports the cylindrical proximal end of the fitting with which it forms a tight but weakly integral assembly. The actual cylindrical movable element consists of two parts:

- La partie distale (prlongée par l'ajustage) qui répond à l'ouverture de l'embout cylindrique externe de la seringue : son diamètre externe est légèrement supérieur au diamètre externe du mandrin de l'aiguille, son diamètre interne délimite une cavité cylindrique dont le diamètre est lui-même légèrement supérieur à la section de la partie cy¬ lindrique de l'ajustage.- The distal part (extended by adjustment) which responds to the opening of the external cylindrical tip of the syringe: its external diameter is slightly greater than the external diameter of the mandrel of the needle, its internal diameter defines a cylindrical cavity the diameter of which is itself slightly greater than the section of the cylindrical part of the adjustment.

- La partie proximale formant le corps de l'éié- ment mobile cylindrique : son diamètre externe est légère¬ ment inférieur au diamètre interne de l'embout cylindrique dans lequel elle est susceptible de coulisser, mais légère¬ ment supérieur au diamètre du rebord délimitant l'ouverture de l'embout cylindrique externe de la seringue qui forme donc une butée empêchant le déplacement de l'élément mobile cylindrique dans le sens postéro antérieur.- The proximal part forming the body of the cylindrical mobile element: its external diameter is slightly less than the internal diameter of the cylindrical end piece in which it is capable of sliding, but slightly greater than the diameter of the delimiting rim the opening of the external cylindrical tip of the syringe which therefore forms a stop preventing the displacement of the mobile cylindrical element in the posterior anterior direction.

- La partie moyenne de la surface cylindrique de cette partie proximale supporte un joint en caoutchouc ou en plastique souple destiné à parfaire l'étanchόité et qui vient en regard du relief de la zone de jonction du pro¬ longement cylindrique interne avec les languettes flexibles. Lorsque les languettes ne sont pas écartées , elles étran¬ glent le joint assurant l'étanchόité pendant l'injection, lorsqu'elles sont écartées en fin d'injection, le joint est libéré facilitant ainsi le glissement de l'élément mobile par rapport aux languettes.- The middle part of the cylindrical surface of this proximal part supports a rubber or flexible plastic gasket intended to perfect the seal and which comes opposite the relief of the junction zone of the internal cylindrical extension with the flexible tongues. When the tongues are not separated, they étran¬ glue the seal ensuring the seal during injection, when they are separated at the end of injection, the seal is released thus facilitating the sliding of the movable element relative to the tongues.

L'a cavité interne de cette partie proximale porte des reliefs circulaires formant des barbillons . Suivant une autre caractéristique de l'invention, le prolongement cylindrique dont est pourvu le piston à son extrémité répondant à la base de la seringue est composé de plusieurs parties : The internal cavity has this proximal portion carries circular reliefs forming barbs. According to another characteristic of the invention, the cylindrical extension with which the piston is provided at its end corresponding to the base of the syringe is composed of several parts:

- Un segment jouxtant le piston, de large section. - Un segment médian de section moyenne, portant des barbillons.- A segment adjoining the piston, of large section. - A middle segment of medium section, carrying barbels.

- Un segment distai de section fine, terminé par des petits barbillons réalisant un grappin- A distai segment of fine section, terminated by small barbs making a grapple

Suivant une autre caractéristique de l'invention, le segment du prolongement jouxtant le piston a une section supérieure ou égaie au diamètre externe de l'élément mobile cylindrique, et une longueur telle que son extrémité aff¬ leure la base proximale de l'élément mobile cylindrique lors que le piston de la seringue est pousée à bout de course. Ce segment forme un épaulement dont extrémité est carénée de manière telle que le carénage et la surface cylindrique de ce segment du prolongement du piston sont susceptibles d'entrer en contact avec la grande base libre et le plus pe¬ tit des côtés parallèles des ergots avant que le piston de la seringue ne soit en bout de course, lors de la course du piston de la seringue, ce segment de section large s'engage entre les ergots et les languettes flexibles qu'elle écarte, la butée formée par les ergots est levée et l'élément mobile cylindrique peut se déplacer d'avant en arrière. Suivant une autre caractéristique de l'invention, le segment médian du prolongement du piston a une section légèrement inférieure au diamètre de la cavité de l'élément mobile cylindrique de façon à pouvoir s'y engager et couli- sser ; ce segment a longueur telle que son extrémité vient buter contre l'extrémité proximale de l'ajustage avant que le piston de la seringue ne soit en bout de course. Lorsque le piston de la seringue est poussé en bout de course, le segment médian forme poussoir et désolidarise l'ajustage de l'élément mobile bloqué vers l'avant par la butée formée par le rebord de l'extrémité de l'embout externe. Ce segment médian porte des reliefs circulaires formant des barbillons destinés à s'engrener dans ceux disposés en sens inverse dont est munie la cavité de l'élément mobile cylindrique, et à permettre la traction de celui à lorsqu'il est libéré par i'écartement des ergots et que le piston est tiré vers l'ar¬ rière. Le segment médian est enfin nervure longitudinaiement de façon à permettre l'écoulement du liquide résiduel lors¬ que le piston parvient en fin de course. Suivant une autre caractéristique de l'invention, le segment distal du prolongement du piston a une section légèrement inférieure au diamètre du conduit de l'ajustage de façon à pouvoir s'y engager et coulisser, et une longueur légèrement supérieure à celui-ci. Ce segment distal est mu- ni à son extrémité de barbillons formant comme les branches d'un grappin destinées à tirer l'aiguille en arrière après l'injection lors de la traction du piston. Comme le segment médian, le segment distal est nervure longitudinaiement pour permettre l'écoulement de la goutte résiduelle en fin d'injection.According to another characteristic of the invention, the extension segment adjoining the piston has an upper section or equal to the external diameter of the cylindrical mobile element, and a length such that its end aff¬ ries the proximal base of the mobile element cylindrical when the syringe plunger is pushed to the end of its travel. This segment forms a shoulder, the end of which is faired in such a way that the fairing and the cylindrical surface of this segment of the extension of the piston are capable of coming into contact with the large free base and the smallest of the parallel sides of the front pins. that the piston of the syringe is at the end of its travel, during the stroke of the syringe piston, this segment of wide section engages between the lugs and the flexible tongues which it spreads, the stop formed by the lugs is lifted and the cylindrical movable member can move back and forth. According to another characteristic of the invention, the median segment of the extension of the piston has a section slightly smaller than the diameter of the cavity of the cylindrical movable element so as to be able to engage and slide therein; this segment has a length such that its end abuts against the proximal end of the adjustment before the syringe piston is at the end of its travel. When the syringe plunger is pushed to the end of its travel, the median segment forms a plunger and separates the adjustment of the movable element blocked forwards by the stop formed by the rim of the end of the external endpiece. This median segment carries circular reliefs forming barbs intended to mesh with those arranged in opposite direction which is provided with the cavity of the cylindrical movable element, and to allow the traction of that when it is released by the spacing lugs and that the piston is pulled back. The median segment is finally rib longitudinally so as to allow the flow of residual liquid when the piston reaches the end of the stroke. According to another characteristic of the invention, the distal segment of the extension of the piston has a cross section slightly less than the diameter of the adjustment duct so as to be able to engage and slide therein, and a length slightly greater than the latter. This distal segment is provided at its end with barbs forming like the branches of a grapple intended to pull the needle back after the injection when the piston is pulled. Like the middle segment, the distal segment is longitudinally ribbed to allow the flow of the drop residual at the end of injection.

Le piston peut comporter un pas de vis sur sa face répondant au• bras de piston permettant de dévisser celui-ci après usage comme cela existe sur les seringues à vaccin. Enfin le capuchon protecteur de l'aiguille peut être livré avec un bouchon prévu de façon à s'adapter à l'extrémité de l'embout cylindrique de la seringue et empêcher la sortie de l'aiguille rétractée dans le corps.de la seringue formant boitier. II est bien compris que le principe de la seringue à aiguille rétractable après usage selon l'invention peut être mis en oeuvre sur des seringues réunissant partielle¬ ment les caractéristiques de la présente invention, par exemple les seringues à faible contenance type seringue à insuline ou seringue à intra-dermo peuvent pour des raisons de dimensions être conçues à l'origine non pas avec une ai¬ guille adaptable à mandrin, mais avec une aiguille montée solidaire de l'élément mobile cylindrique, montage qui per¬ met de réduire considérablement le diamètre de l'ouverture de l'embout externe, et de supprimer le segment distal du prolongement du piston, le segment muni des barbillons assure alors la rétraction de l'aiguille par l'intermédi¬ aire de l'élément cylindrique auquel elle est solidaire.The plunger may have a thread on its face corresponding to the • plunger arm making it possible to unscrew the latter after use, as exists on vaccine syringes. 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 syringe and prevent the exit of the retracted needle into the body of the syringe forming housing. It is clearly understood that the principle of the syringe with retractable needle after use according to the invention can be implemented on syringes partially meeting the characteristics of the present invention, for example syringes with low capacity such as insulin syringe or Intra-dermo syringe may for reasons of dimensions be designed originally not with a needle adaptable to a mandrel, but with a needle mounted integral with the cylindrical movable element, mounting which allows the considerably to reduce the diameter of the opening of the external tip, and to remove the distal segment of the extension of the piston, the segment provided with barbs then ensures the retraction of the needle by the intermediary of the cylindrical element to which it is integral .

L'invention est représentée à titre d'exemples non limitatifs sur les schémas ci-joints dans lesquels :The invention is represented by way of nonlimiting examples in the attached diagrams in which:

- La figure 1 est une vue en coupe axiale schématique de la seringue selon l'invention avec un agrandissement partiel de l'extrémité de la seringue et une coupe frontale selon ÂÀ' - La figure 2 est la vue schématique en coupe axiale, l'agrandissement partiel de l'extrémité et la coupe fron¬ tale selon AA' de la même seringue que sur la figure 1, en fin d'injection. - La figure 3 est une vue en coupe axiale schématique de la seringue aux divers stades de l'injection 3a début d'in¬ jection, 3b cours de l'injection, 3c fin de l'injection, 3d, 3e, 3f seringue après l'injection.- Figure 1 is a schematic axial sectional view of the syringe according to the invention with a partial enlargement of the end of the syringe and a front section along ÂÀ ' - Figure 2 is the schematic view in axial section, the partial enlargement of the end and the fron¬ tale section along AA 'of the same syringe as in Figure 1, at the end of injection. - Figure 3 is a schematic axial sectional view of the syringe at the various stages of injection 3a start of injection, 3b during injection, 3c end of injection, 3d, 3e, 3f syringe after injection.

- La figure 4 est une vue en coupe axiale schématique des éléments constituant une seringue selon l'invention.- Figure 4 is a schematic axial sectional view of the elements constituting a syringe according to the invention.

- Les figures 5,6,7 et & représentent des vues en coupe axiale schématique de deux modes de réalisation de la seringue selon l'invention.- Figures 5,6,7 and & show schematic axial section views of two embodiments of the syringe according to the invention.

La figure 1 représente une seringue conforme à l'invention vide ou au début 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 limitée par un rebord 6, cet embout cylindrique externe 4 a un prolongement interne 7 divisé par des fentes 3 en languettes flexibles 9 terminées par des ergots 10 en forme de trapèze rectangle, dont le côté non parallèle le plus petit 1 forme une butée, et la, petite base 12 est suffi¬ samment longue et se prolonge par le côté non parallèle le plus grand 13. La face interne de la racine des languettes flexibles 9 comporte un relief 14 destiné à assurer i'étan- cheité avec le joint 15 supporté par l'élément mobile cy¬ lindrique 16, dont la partie distale 17 a un diamètre ex¬ terne 18 légèrement supérieur au diamètre externe du mand¬ rin 1» de l'aiguille, et un diamètre interne légèrement supérieur à celui de la partie cylindrique de l'ajustage 20 qui le prolonge. La partie proximale 22 de l'élément mobile cylindrique 16 a un diamètre légèrement inférieur à celui de l'embout cylindrique 4-7 dans lequel il coulisse, ce diamètre est toutefois supérieur à celui du rebord 6, qui forme une butée immobilisant vers l'avant l'élément mobile cylindrique 16 qui est par ailleurs immobilisé vers l'arrière par les ergots 10.Figure 1 shows a syringe according to the invention empty or at the start of an injection: the piston 2 slides in the body 1 of the syringe which carries at its base 3 an external cylindrical tip 4 whose opening 5 is limited by a rim 6, this external cylindrical end piece 4 has an internal extension 7 divided by slots 3 in flexible tabs 9 terminated by lugs 10 in the shape of a rectangular trapezoid, the smallest non-parallel side 1 of which forms a stop, and the , small base 12 is suffi¬ ciently long and is extended by the larger non-parallel side 13. The internal face of the root of the flexible tongues 9 has a relief 14 intended to ensure the seal with the seal 15 supported by the 'mobile cylindrical element 16, the distal part 17 of which has an external diameter 18 slightly greater than the external diameter of the needle mandrel 1 "and an internal diameter slightly greater than that of the cylindrical part of the adjustment 20 which extends it. The proximal part 22 of the cylindrical movable element 16 has a diameter slightly less than that of the cylindrical end piece 4-7 in which it slides, this diameter is however greater than that of the rim 6, which forms a stop immobilizing towards the before the cylindrical movable element 16 which is moreover immobilized towards the rear by the pins 10.

La cavité 23 de l'élément mobile cylindrique 16 est munie de reliefs 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 supé¬ rieure ou égaie au diamètre de l'élément mobile cylindrique 16, son extrémité porte un carénage 27. Le segment médian 28 a une section inférieure au diamètre de la cavité 23 de l'élément 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'élément mobile cylindrique 16. Le segment distal 30 a une section inférieure au diamètre du conduit de l'ajustage 20 dans lequel il est susceptible de s'engager, il est muni à son extrémité de barbillons 3i dont les braches forment un grap¬ pin.The cavity 23 of the cylindrical movable element 16 is provided with circular reliefs forming barbs 24. The piston 2 is provided with an extension 25 in three parts 26, 28, 30. The wide segment 26 has a upper section or equal to the diameter of the cylindrical movable element 16, its end carries a fairing 27. The median segment 28 has a cross section smaller than the diameter of the cavity 23 of the cylindrical movable element 16 in which it is likely to engage , it is provided with barbs 29 which are likely to mesh with the barbs 24 of the cylindrical movable element 16. The distal segment 30 has a cross section smaller than the diameter of the fitting duct 20 in which it is likely to s 'engage, it is provided at its end with barbs 3i whose braches form a grap¬ pin.

- La figure 2 représente une seringue conforme à l'invention en fin d'injection : le piston 2 est poussé à bout de course contre la base 3 du corps de seringue 1. Le segment large 26 du prolongement du piston 25 a une lon¬ gueur telle que son extrémité affleure la base de l'élément mobile cylindrique 16, il forme un épaulement dont l'extré¬ mité carénée 27 après avoir été en contact avec les côtés non parallèles les plus grands 13 et les petites bases 12 les ergots 10 les a écartés par fléchissements des lan¬ guettes flexibles 9 dont les reliefs 14 qui étranglaient les joints d'étancheité 15 ont désseré leur étreinte; ainsi l'élément mobile cylindrique 16 est libéré de la butée 11 de l'ergot 10. Le segment médian 28 du prolongement du pis¬ ton a coulissé dans la cavité 23 de l'élément mobile cylind¬ rique 16 bloqué vers l'avant par la butée formée par le rebord 6 de l'embout externe 4, la longueur du segment médi¬ an 28 est telle qu'il a fait poussoir et désolidarisé 1'en- semble ajustage-élément mobile cylindrique 20-16, qui était faiblement solidaire; les barbillons 29 du segment médian sonτ engrenés aux barbillons 24 disposés en sens inverse de la cavité 23 de l'élément mobile cylindrique 16. Le segment distal 30 a coulissé dans le conduit de l'ajustage 16, sa longueur est telle que les barbillons 31 forment un grappin terminai déployé au bout de l'ajustage 16.FIG. 2 represents a syringe according to the invention at the end of injection: the piston 2 is pushed at the end of its travel against the base 3 of the syringe body 1. The wide segment 26 of the extension of the piston 25 has a length such that its end is flush with the base of the cylindrical movable element 16, it forms a shoulder, the faired end of which 27 after being in contact with the sides not the largest 13 and the small bases 12 parallel the lugs 10 have separated them by flexing flexible lan¬ guettes 9 whose reliefs 14 which throttled the seals 15 have released their grip; thus the cylindrical movable element 16 is released from the stop 11 of the lug 10. The median segment 28 of the extension of the piston slid in the cavity 23 of the cylindrical movable element 16 blocked forwards by the stop formed by the rim 6 of the external end piece 4, the length of the medi¬ year segment 28 is such that it caused pushing and disengaged 1'en- seems adjustment-cylindrical mobile element 20-16, which was weakly secured ; the barbs 29 of the middle segment sonτ meshed with the barbs 24 arranged in the opposite direction to the cavity 23 of the cylindrical movable element 16. The distal segment 30 has slid in the adjustment duct 16, its length is such that the barbs 31 form a terminal grapple deployed at the end of the fitting 16.

La figure 3a représente la seringue conforme à l'invention en début d'injection telle que décrite figure 1. La figure 3b représente la seringue selon l'inven- tion en cours d'injection : le carénage 27 du segment large 26 du prolongement du piston abordant le côté non parallèle le plus grand 13 et la petite base 12 des ergots 10 qui s'écartent peu à peu. Le segment médian 28 coulisse dans la cavité 23 de l'élément mobile cylindrique 16 et a une Ion- gueur telle qu'il bute contre l'ajustage 20 et fait pous¬ soir.Figure 3a shows the syringe according to the invention at the start of injection as described in Figure 1. Figure 3b shows the syringe according to the invention during injection: the fairing 27 of the wide segment 26 of the extension of the piston approaching the larger non-parallel side 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 an ion gueur as it abuts against the adjustment 20 and makes pous¬ evening.

La figure 3c représente la seringue selon l'inven¬ tion en fin d'injection telle que décrite figure 2 : le piston 2 touche la base 3 du corps de la seringue 1 , le segment large 26 du prolongement du piston écarte complètement languettes flexibles 9 et ergots 10 libérant vers l'arrière l'élément mobile cylindrique 16 , les* reli¬ efs d'étanchéité i4 s'écatent des joints 15. Le segment médian 28 a désolidarisé l'ensemble ajustage—élément mo¬ bile cylindrique 20-16, ses barbillons 29 sont engrenés aux barbillons 24 de l'élément mobile cylindrique 16. Le segment distal 30 a coulissé dans le conduit de l'ajus¬ tage 20, ses barbillons terminaux 31 sont déployés au bout de l'ajustage.FIG. 3c represents the syringe according to the invention at the end of injection as described in FIG. 2: the plunger 2 touches the base 3 of the body of the syringe 1, the wide segment 26 of the extension of the plunger deviates completely flexible tongues 9 and lugs 10 releasing the cylindrical movable element 16 towards the rear, the * reli¬ sealing efs i4 collide with the seals 15. The middle segment 28 has separated the adjustment assembly — cylindrical mo¬ bile element 20-16 , its barbs 29 are meshed with the barbs 24 of the cylindrical mobile element 16. The distal segment 30 has slid in the duct of the nozzle 20, its terminal barbs 31 are deployed at the end of the adjustment.

La figure 3d représente la seringue selon l'inven¬ tion après l'injection : l'utilisateur tire en arrière le bras 32 du piston 2, l'importance de la longueur de la pe¬ tite base 12 de l'ergot 10 empêche celui-ci de s'intercaler entre l'extrémité du segment large 26 du prolongement de piston de l'élément mobile cylindrique i6 solidarisés entre eux par l'engrenage de leurs barbillons respectifs 29 et 24. les ergots iO restent donc écartés lorsque l'ensemble pro¬ longement du piston-élément mobile cylindrique 26-16 est tiré en arrière. Les barbillons 31 qui terminent le segment distal 30 du prolongement du piston tirent en arrière l'a¬ justage 20 cassé dans le mandrin 19 de l'aiguille dont le diamètre externe est inférieur à celui du rebord 6 de l'ou¬ verture 5 de l'embout cylindrique externe 4. La figure 3e représente la seringue conforme à l'in¬ vention après l'injection lorsque l'utilisateur continue de tirer le piston en arrière : l'ensemble prolongement du piston-élément mobile cylindrique-ajustagβ-aiguille 25-16- 20-19 rentre dans le corps de la seringue 1.Figure 3d shows the syringe according to the invention after the injection: the user pulls back the arm 32 of the piston 2, the importance of the length of the small base 12 of the lug 10 prevents that -ci to be inserted between the end of the wide segment 26 of the piston extension of the cylindrical movable element i6 secured to each other by the gear of their respective barbs 29 and 24. the lugs iO therefore remain separated when the assembly extension of the piston-cylindrical movable member 26-16 is pulled back. The barbs 31 which terminate the distal segment 30 of the extension of the piston pull back the snap 20 broken in the mandrel 19 of the needle whose external diameter is less than that of the rim 6 of the opening 5 of the external cylindrical end piece 4. FIG. 3e represents the syringe according to the invention after the injection when the user continues to pull the piston back: the extension assembly of the piston-cylindrical movable element-adjustment-needle 25-16-20-19 fits into the body of the syringe 1.

La figure 3f représente la seringue conforme à l'in¬ vention : l'aiguille complètement rentrée dans le corps 1 de la seringue, le bras du piston 32 est dévissé; l'embout cylindrique externe 4 peut recevoir le bouchon 33 du capu- chon de l'aiguille.FIG. 3f shows the syringe according to the invention: the needle completely retracted into the body 1 of the syringe, the arm of the piston 32 is unscrewed; the external cylindrical endpiece 4 can receive the plug 33 of the needle cap.

La figure 4 représente les divers éléments consti¬ tutifs de la seringue conforme à l'invention : corps de se¬ ringue 1 , piston 2 et son prolongement 25 en trois parties 26, 28, 30 élément mobile cylindrique 16 avec son joint d ' étanchéité 15 et prolongé par l'ajustage 20, bras de pis¬ ton 32. La flèche indique le mode de montage : l'ensemble élément mobile cylindrique-ajustage est mis en place par le corps de la seringue.FIG. 4 represents the various constituent elements of the syringe according to the invention: body of ring 1, piston 2 and its extension 25 in three parts 26, 28, 30 cylindrical movable element 16 with its seal 15 and extended by the adjustment 20, pis¬ ton arm 32. The arrow indicates the mounting method: the cylindrical movable element-adjustment assembly is put in place by the body of the syringe.

La figure 5 représente un mode de réalisation d'une seringue conforme à l'invention où la partie proximale 22 de l'élément mobile n'est pas cylindrique, mais en tronc de cône à grande base postérieure enchâssé en force dans le prolongement interne 7 du cylindre, ce mode de réalisation est susceptible de permettre éventuellement la suppression du relief et du joint d 'étanchéité, ou de parfaire celle-ci s'ils sont maintenus.FIG. 5 shows an embodiment of a syringe according to the invention in which the proximal part 22 of the movable element is not cylindrical, but in a truncated cone with a large posterior base embedded in force in the internal extension 7 of the cylinder, this embodiment may optionally allow deletion relief and seal, or perfect thereof if they are maintained.

La figure 6 représente un autre mode de réalisation d'une seringue conforme à l'invention où l'ajustage 20 est solidaire et inséparable de l'élément mobile cylindrique 16, ce mode de réalisation permet de réduire le prolongement 25 du piston 2 à deux parties seulement. Le segment large 26 forme toujours un épaulement tandis que le segment 27 devi¬ ent distal et perd son rôle de poussoir, ses barbillons 29 destinés à s'engrener aux barbillons 24 de l'élément mobile cylindrique 16, permettent la traction de l'ensemble pro¬ longement du piston-élément mobile cyiindrique-ajustage- aiguiiie 25-16-20-19,cet ensemble est entièrement rétrac¬ table dans le corps de la seringue. Les figures 7a,7b,7c,7d représentent un mode de réa¬ lisation d'une seringue conforme à l'invention utilisant une aiguille classique ou comme précédemment figure 6, l'ajus¬ tage 20 solidaire de l'élément mobile i6, comporte une pai— tie distaie 33 qui permet l'adaptation au mandrin de l'aigu- ille, et une partie proximale 34 de même diamètre que la couronne 35 du mandrin. Les languettes flexibles 9 forment un tronc de cône dont la petite base répond à leurs extrémi¬ tés terminées par des ergots dont la forme est voisine de celle d'un rectangle (figure 7d) : le petit coté antérieur li a angle droit avec la languette forme butée. L'autre pe¬ tit coté 36 est dans un pian parallèle au pian de la cou¬ ronne 35 du mandrin de l'aiguille. Le bord libre de l'ergot a une partie antérieure 37 parallèle à la languette et une partie postérieure 38 parallèle au mandrin de l'aiquille , (fig 7d) . Cette disposition forme une butée dans le sens postero-antérieur est compensée par une forme carénée accen¬ tuée de 1'épaulement 26 du prolongement du piston. Ce mode de réalisation permet d'avoir une butée retenant la couronne 35 d'une aiguille classique empêchant l'aiguille de ressor- tir ( Tigure / c )FIG. 6 represents another embodiment of a syringe according to the invention where the adjustment 20 is integral and inseparable from the cylindrical movable element 16, this embodiment makes it possible to reduce the extension 25 of the piston 2 to only two parts. The wide segment 26 always forms a shoulder while the segment 27 becomes distal and loses its role as a pusher, its barbs 29 intended to mesh with the barbs 24 of the cylindrical mobile element 16, allow the traction of the assembly extension of the piston-moving element cyiindrique-adjustment-aiguiiie 25-16-20-19, this assembly is entirely retrac¬ table in the body of the syringe. FIGS. 7a, 7b, 7c, 7d represent a method of realizing a syringe according to the invention using a conventional needle or as previously in FIG. 6, the adjusage 20 secured to the movable element i6, comprises a distilled part 33 which allows adaptation to the mandrel of the needle, and a proximal part 34 of the same diameter as the crown 35 of the mandrel. The flexible tongues 9 form a truncated cone whose small base responds to their extremi¬ tees terminated by lugs the shape of which is close to that of a rectangle (FIG. 7d): the small anterior side li at right angles to the tongue stop form. The other side pe¬ tit 36 is in a plane parallel to the plane of the crown 35 of the mandrel of the needle. The free edge of the lug has a front part 37 parallel to the tongue and a rear part 38 parallel to the mandrel of the needle, (fig 7d). This arrangement forms a stop in the postero-anterior direction is compensated by a streamlined shape accen¬ killed by the shoulder 26 of the extension of the piston. This embodiment makes it possible to have a stop retaining the crown 35 of a conventional needle preventing the needle from coming out again. shooting (Tigure / c)

La figure 8 représente une seringue selon l'invention de petit caiibre(à uitra-dermo ou à insuline), à "aiguille montée" solidaire de l'élément mobile; les languettes comme 5 figure 7 empêchent l'ensemble aiguilie-èiément mobile de ressortir. Ce mode de réalisation avec aiguille montée per¬ met une miniaturisation indispensable pour les seringues petit calibre.FIG. 8 represents a syringe according to the invention of small gauge (uitra-dermo or insulin), with "needle mounted" secured to the movable element; the tabs as 5 in FIG. 7 prevent the needle-movable assembly from coming out. This embodiment with needle mounted per¬ puts miniaturization essential for small caliber syringes.

Ainsi, l'usage d'une seringue hygiénique conforme -,C à l'invention permet la rétraction de l'aiguille dans le corps de la seringue formant boitier, tout risque de pi¬ qûre septique est donc écarté.Thus, the use of a hygienic syringe according to -, C to the invention allows the retraction of the needle in the body of the syringe forming a housing, any risk of pi¬ septic qûre is ruled out.

Ce matériel est facilement réalisable : le moulage du corps de seringue avec esehout cylindrique, tout comme 15 celui du piston avec orolongement sont d'une faisabilité et d'un coût semblables à ceux d'une seringue conventionnelle. Le moulaqβ de l'ensemble mobile cylindrique-ajustage n'a¬ joute aucune difficulté et ne peut apporter qu'un faible surcoût. 20 L'adoption généralisée de matériel à injection hygiénique selon l'invention apporterait à peu de frais une contribution considérable à l'hygiène et à la préven¬ tion des maladies transmises par piqûre septique. This material is easily achievable: the molding of the syringe body with a cylindrical esehout, like that of the plunger with an extension, is of similar feasibility and cost as that of a conventional syringe. The moulaqβ of the cylindrical-fitting mobile assembly does not add any difficulty and can only bring a small additional cost. The widespread adoption of hygienic injection equipment according to the invention would make a considerable contribution to hygiene and to the prevention of diseases transmitted by septic injection at low cost.

Claims

i 4 i 4 K fc V fc N U X U A I X U IM 5K fc V fc N U X U A I X U IM 5 1 ) Seringue hygiénique conçue de manxere a pei— mettre la rétraction de l'aiguille dans le corps de se¬ ringue formant un boitier jetable après usage, caractéri¬ sé en ce que l'embout cylindrique 4 à la base 3 du corps 5 de seringue 1 a un prolongement interne cylindrique 7 muni de fentes longitudinales 8 séparant des portions de surface cylindrique qui forment des languettes flexibles 9 terminées par des ergots 10 formant butée ; en ce que cet embout 4 et son prolongement interne 7 terminé en languettes 9, reçoi— C vent un élément mobile cylindrique 16 (ou partiellement cy¬ lindrique et partiellement conique) de diamètre légèrement inférieur et susceptible d'y coulisser, cet élément mobile creux 16 supporte l'ajustage 20 à son extrémité, sa cavité 23 est munie de reliefs circulaires formant des barbillons 5 24: en ce que le prolongement 25 du piston 2 est composé d'au moins deux parties : une partie de large section 26, une partie de section plus étroite 28; en ce que la partie 26 du prolongement du piston 2 forme un épaulement caréné à son extrémité 27 et de section large supérieure ou égaie 0 au diamètre externe de 1'élément mobile 16, et de longueur telle que son extrémité affleure ce dernier lorsque le pis¬ ton 2 est à bout de course, cet épaulement 26 est suscep¬ tible de s'engager entre les divers ergots 10 et languettes 9 du prolongement interne 7, de les écarter lever la butée 5 qu'ils forment et de permettre finalement la traction vers l'arrière de l'élément mobile 16; en ce que la partie plus étroite 28 du prolongement du piston 2 a une section infé- rieure au diamètre de la cavité 23 de l'élément mobile 16 où il est susceptible de s'engager et coulisser, la surface de cette partie 28 porte par ailleurs des barbillons 29 susceptibles de s"engrener aux barbillons 24 de l'élément 5 mobile 16 disposés en sens inverse,et de permettre finale¬ ment la traction vers l'arrière de l'élément mobile 16 et de ses parties attenantes éventuelles selon le mode de ré¬ alisation.1) Hygienic syringe designed in such a way as to put the retraction of the needle into the body of the ring forming a disposable case after use, characterized in that the cylindrical tip 4 at the base 3 of the body 5 of syringe 1 has a cylindrical internal extension 7 provided with longitudinal slots 8 separating portions of cylindrical surface which form flexible tongues 9 terminated by lugs 10 forming a stop; in that this endpiece 4 and its internal extension 7 terminated in tongues 9, receives a cylindrical mobile element 16 (or partially cylindrical and partially conical) of slightly smaller diameter and capable of sliding therein, this hollow mobile element 16 supports the adjustment 20 at its end, its cavity 23 is provided with circular reliefs forming barbs 5 24: in that the extension 25 of the piston 2 is composed of at least two parts: a wide section 26, a narrower section portion 28; in that the part 26 of the extension of the piston 2 forms a shrouded shoulder at its end 27 and of larger cross section greater than or equal to the external diameter of the mobile element 16, and of length such that its end is flush with the latter when the udder ¬ your 2 is at the end of its travel, this shoulder 26 is suscep¬ tible to engage between the various lugs 10 and tabs 9 of the internal extension 7, to spread them lift the stop 5 that they form and finally allow traction towards the rear of the movable element 16; in that the narrower part 28 of the extension of the piston 2 has a smaller cross-section smaller than the diameter of the cavity 23 of the movable element 16 where it is capable of engaging and sliding, the surface of this part 28 moreover carries barbs 29 capable of "meshing with the barbs 24 of the movable element 5 16 arranged in opposite directions, and finally allow the rearward traction of the movable element 16 and of its possible adjoining parts according to the embodiment. 2) Seringue conforme à la revendication 1 caracté- "- risée en ce que l'embout cylindrique externe 4 porte a son extrémité une ouverture cylindrique 5 limitée par un rebord 6 dont le diamètre est supérieur à celui du mandrin 19 de l'aiguille.2) Syringe according to claim 1 charac- "- derision in that the outer cylindrical tip 4 carries at its end a cylindrical opening 5 bounded by a flange 6 having a diameter greater than that of the mandrel 19 of the needle. 3) Seringue conforme aux revendications 1 et 2 "• - caractérisée en ce que les ergots 10 ont en coupe la forme d'un trapèze-retangie dont la grande base prolonge les lan¬ guettes 9 du prolongement interne 7, la petite base 12 de dimension assez importante prolonge le plus grand des côtés non parallèles 13, et dont le plus petit côté non parallèle 2 11 à angle droit avec la languette 9 forme une butée intéri¬ eure à l'extrémité de chaque languette 9 empêchant le dép¬ lacement de l'élément mobile 16 vers l'arrière pendant l'in¬ jection, la levée de cette butée par 1'épaulement 26 du pro¬ longement de piston libère vers l'arrière l'élément mobile '- - 16 à la fin de l'injection. Les ergots peuvent encore avoir une forme voisine d'un rectangle dont le petit coté posté¬ rieur est dans un pian parallèle au plan de la couronne du mandrin de l'aiguille formant butée, destinée à retenir l'aiguille ; le grand coté libre de l'ergot a une partie postérieure parallèle au mandrin de l'aiguille.3) Syringe according to claims 1 and 2 "• - characterized in that the lugs 10 have in section the shape of a trapezoid-retangie whose large base extends the lan¬ guettes 9 of the internal extension 7, the small base 12 of fairly large dimension extends the largest of the non-parallel sides 13, and of which the smallest non-parallel side 2 11 at right angles to the tongue 9 forms an internal stop at the end of each tongue 9 preventing the displacement of the movable element 16 towards the rear during the injection, the lifting of this stop by the shoulder 26 of the piston extension releases the movable element towards the rear ' - - 16 at the end of the The lugs can also have a shape similar to that of a rectangle, the short side of which is in a plane parallel to the plane of the crown of the needle mandrel forming a stopper, intended to retain the needle; the large free side of the lug has a posterior part parallel to the mandrel of the needle. 4) Seringue conforme aux revendications 1,2,3 caracté- risée en ce que la base des languettes flexibles 9 com¬ portent sur leur face intérieure un relief i4 répondant à un joint souple situé sur la surface cylindrique (ou co¬ nique) de l'élément mobile et destiné à assurer une parfaite étanchéité.4) A syringe according to claims 1,2,3 characterized in that the base of the flexible tongues 9 com¬ carry on their inner face a relief i4 responding to a flexible seal located on the cylindrical (or conical) surface of the movable element and intended to ensure a perfect seal. 5} Seringue conforme aux revendications 1,2,3,4 caractérisée en ce que l'ensemble élément mobile—ajustage 1 -20 est etanche mais faiblement solidaire; en ce que le segment 28 du prolongement de piston à section inférieure au diamètre de la cavité 23 de l'élément mobile 16, est de longueur telle que son extrémité bute contre l'ajustage 20 avant que le piston ne soit en bout de course et fait pou¬ ssoir désolidarisant l'ensemble faiblement solidaire élé¬ ment mobile-a ustage 16-20; en ce que ce segment 28 suppor¬ te un prolongement de section fine constituant un troisième segment 30 au prolongement de piston 25; en ce que la sec¬ tion de ce segment 30 est inférieure au diamètre du conduit de l'ajustage 20 où il est susceptible de s'engager et cou¬ lisser, et qu'il est muni à son extrémité de barbillons 31 formant comme les branches d'un grappin destinés à tirer en arrière l'ajustage 20 bloqué dans le mandrin de l'aiguille 19. 5} A syringe according to claims 1, 2, 3, 4 characterized in that the movable element-adjustment assembly 1 -20 is sealed but weakly secured; in that the segment 28 of the piston extension with a cross section smaller than the diameter of the cavity 23 of the movable element 16 is of such length that its end abuts against the adjustment 20 before the piston is at the end of its travel and is a po¬ ssoir separating the weakly integral assembly elé¬ ment mobile-ustage 16-20; in that this segment 28 supports a thin section extension constituting a third segment 30 to the piston extension 25; in that the sec¬ tion of this segment 30 is less than the diameter of the fitting duct 20 where it is likely to engage and cou¬ smooth, and that it is provided at its end with barbs 31 forming like the branches of a grapple intended to pull back the adjustment 20 blocked in the mandrel of the needle 19.
PCT/FR1991/000154 1990-02-26 1991-02-25 Syringe with retractable needle Ceased WO1991012841A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9002325A FR2658724B1 (en) 1990-02-26 1990-02-26 HYGIENIC SYRINGE WITH A RETRACTABLE NEEDLE IN THE SYRINGE BODY AFTER USE.
FR90/02325 1990-02-26

Publications (1)

Publication Number Publication Date
WO1991012841A1 true WO1991012841A1 (en) 1991-09-05

Family

ID=9394111

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1991/000154 Ceased WO1991012841A1 (en) 1990-02-26 1991-02-25 Syringe with retractable needle

Country Status (6)

Country Link
EP (1) EP0516761A1 (en)
JP (1) JPH05503649A (en)
AU (1) AU7551491A (en)
CA (1) CA2076864A1 (en)
FR (1) FR2658724B1 (en)
WO (1) WO1991012841A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993023100A1 (en) * 1992-05-15 1993-11-25 Thomas Lenz Disposable injection syringe
US5370619A (en) * 1989-12-20 1994-12-06 Rossi; Lucio Single-use safety syringe provided with retractile needle and device preventing it from being reused
EP0661067A1 (en) * 1993-12-16 1995-07-05 Long-Hsiung Chen Simplified safety syringe with retractable self-biased needle
EP0681487A4 (en) * 1993-02-01 1997-05-21 Innova Dev Corp Hypodermic syringe with needle retraction feature.
WO2020264057A1 (en) * 2019-06-27 2020-12-30 Sharps Technology, Inc. Ultra-low waste disposable safety syringe for low dose injections

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2142735B1 (en) * 1997-11-14 2000-12-01 Sanchez Manuel Valle PERFECTED SYRINGE WITH BUILT-IN LOCKING SYSTEM CALLED FOR SINGLE USE OR NOT REUSABLE.
AU2003225416A1 (en) 2002-06-25 2004-01-06 Medical Patents Limited Injection syringe having a retractable injection needle
NL1020937C2 (en) * 2002-06-25 2003-12-30 Medical Patents Ltd Injection syringe having retractable injection needle for medical applications, has liquid holder with outlet opening, plunger having plunger head, injection needle with needle amount mounted on outlet opening of holder
SE0301667D0 (en) 2003-06-04 2003-06-04 Medsafe Asa Disposable injection syringes

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0321903A2 (en) * 1987-12-21 1989-06-28 Stuart M. Dolgin Fluid passing apparatus with means for covering the same
EP0347742A1 (en) * 1988-06-23 1989-12-27 Aldo Venturini Disposable safety syringe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0321903A2 (en) * 1987-12-21 1989-06-28 Stuart M. Dolgin Fluid passing apparatus with means for covering the same
EP0347742A1 (en) * 1988-06-23 1989-12-27 Aldo Venturini Disposable safety syringe

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5370619A (en) * 1989-12-20 1994-12-06 Rossi; Lucio Single-use safety syringe provided with retractile needle and device preventing it from being reused
WO1993023100A1 (en) * 1992-05-15 1993-11-25 Thomas Lenz Disposable injection syringe
US5527285A (en) * 1992-05-15 1996-06-18 Funova Ab Disposable injection syringe
JP3438074B2 (en) 1992-05-15 2003-08-18 フノヴァ アクチボラグ Disposable syringe
EP0681487A4 (en) * 1993-02-01 1997-05-21 Innova Dev Corp Hypodermic syringe with needle retraction feature.
EP0661067A1 (en) * 1993-12-16 1995-07-05 Long-Hsiung Chen Simplified safety syringe with retractable self-biased needle
WO2020264057A1 (en) * 2019-06-27 2020-12-30 Sharps Technology, Inc. Ultra-low waste disposable safety syringe for low dose injections
KR20220031035A (en) * 2019-06-27 2022-03-11 샤프스 테크놀로지 아이엔씨. Ultra-Low Waste Disposable Syringes for Low Volume Injections
US11497860B2 (en) 2019-06-27 2022-11-15 Sharps Technology, Inc. Ultra-low waste disposable safety syringe for low dose injections
KR102808305B1 (en) 2019-06-27 2025-05-15 샤프스 테크놀로지 아이엔씨. Ultra-low waste disposable syringes for low volume injections
AU2020304062B2 (en) * 2019-06-27 2025-06-26 Sharps Technology, Inc. Ultra-low waste disposable safety syringe for low dose injections

Also Published As

Publication number Publication date
FR2658724B1 (en) 1992-08-28
CA2076864A1 (en) 1991-08-27
FR2658724A1 (en) 1991-08-30
AU7551491A (en) 1991-09-18
EP0516761A1 (en) 1992-12-09
JPH05503649A (en) 1993-06-17

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