WO1999022789A1 - Automatic injector with needle retraction after injection - Google Patents

Automatic injector with needle retraction after injection Download PDF

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Publication number
WO1999022789A1
WO1999022789A1 PCT/FR1998/002342 FR9802342W WO9922789A1 WO 1999022789 A1 WO1999022789 A1 WO 1999022789A1 FR 9802342 W FR9802342 W FR 9802342W WO 9922789 A1 WO9922789 A1 WO 9922789A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
spring
injection
reservoir
elastic means
Prior art date
Application number
PCT/FR1998/002342
Other languages
French (fr)
Inventor
Yves Arnissolle
Original Assignee
Societe D'etudes Et D'applications Techniques - S.E.D.A.T.
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 Societe D'etudes Et D'applications Techniques - S.E.D.A.T. filed Critical Societe D'etudes Et D'applications Techniques - S.E.D.A.T.
Priority to AU10386/99A priority Critical patent/AU1038699A/en
Publication of WO1999022789A1 publication Critical patent/WO1999022789A1/en

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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
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M5/2033—Spring-loaded one-shot injectors with or without automatic needle insertion
    • 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
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M2005/2006—Having specific accessories
    • A61M2005/2013—Having specific accessories triggering of discharging means by contact of injector with patient body
    • 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
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M2005/2073—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically preventing premature release, e.g. by making use of a safety lock
    • 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
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/326—Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user

Definitions

  • the present invention relates to an automatic injector, of the type comprising a body, a syringe reservoir provided with an injection needle and mounted movable in the body of the injector, between a retracted position in the body, in which the needle is housed inside the body, and an injection position, in which the needle protrudes outside the body, a movable injection piston in the syringe tank, first elastic means initially compressed, suitable for the biasing of the piston in order to cause the needle to exit the body of the injector and the injection of the fluid contained in the reservoir, and second elastic means, adapted for returning the reservoir to its retracted position, the injector comprising furthermore means for triggering the first elastic means and means for automatically triggering the second elastic means at the end of injection.
  • the automatic injector described in this document comprises two opposing springs, one of which is adapted for the output of the needle and the injection, and the other is adapted for the return of the reservoir carrying the needle in the body of the injector at the end of injection.
  • the reservoir return spring is adapted to act between a lower shoulder of the injector body and a flange of the mobile reservoir.
  • the reservoir return spring acts against the injection spring for the retraction of the needle into the body, the force of the return spring must be greater than that of the injection spring. Also, the return spring being very powerful, it exerts a force of very high intensity on the collar of the reservoir.
  • the object of the invention is to provide an automatic injector comprising means for retracting the needle at the end of injection, allowing the use of a current reservoir without risk of breaking the collar.
  • the invention relates to an automatic injector of the aforementioned type, characterized in that the second elastic means are adapted to act at least partially between the body of the injector and the piston, when the reservoir is returned.
  • the automatic injector includes one or more of the following characteristics:
  • the second elastic means comprise a compressed i ⁇ itiallement spring carried by the piston, the spring and the piston forming a movable assembly, movable relative to the body during the exit of the needle and injection;
  • the automatic triggering means of the second elastic means comprise a spring retaining ring, slidingly mounted on the piston and on which one end of the spring rests, the other end resting on the piston, the ring and the piston comprising associated means for securing each other to keep the spring initially compressed, the ring and the body comprise associated means adapted to release the securing means by cooperation of the ring with the body at the end of injection, thus releasing the spring, and the ring includes a blocking stop against the body, ensuring the support on the body of the end of the spring bearing on the ring;
  • the associated means for securing the ring to the piston include protruding and hollow means of elastic engagement;
  • the release means comprise, carried by the ring and the body, a cam surface and a cam follower adapted to cooperate in view of the release of the securing means when the piston moves relative to the body;
  • the piston comprises a tubular piston rod and the first elastic means are arranged in the central cylindrical space delimited by the tubular piston rod and bear on the one hand on the body and on the other hand on the piston;
  • the triggering means of the first elastic means comprise, carried by the body and the piston, means for securing the body and the piston and the body comprises means for releasing the securing means;
  • the body comprises a handle and a trigger mounted to slide axially one inside the other, the trigger comprising a cam surface for releasing the securing means;
  • the second elastic means comprise an auxiliary spring adapted to act between the reservoir and the body of the injector;
  • the auxiliary spring is initially relaxed and has a lower force than that of the injection spring, so that the second spring is compressible under the action of the first elastic means during movement of the reservoir for the exit of the needle; and - the piston comprises on the one hand a plug sliding in a sealed manner inside the tank and on the other hand a piston rod independent of the plug and engaged at least partially in the tank, the first elastic means being applied to the piston rod.
  • FIG. 1 is a longitudinal sectional view of the automatic injector according to the invention in its storage state
  • FIG. 2 is a view in longitudinal section of the automatic injector at the start of injection, immediately after the needle has left;
  • - Figure 3 is a longitudinal sectional view of the automatic injector at the start of the retraction of the needle at the end of injection; and - Figure 4 is a longitudinal sectional view of the automatic injector at the end of retraction of the needle into the body of the injector.
  • the automatic injector shown in the figures comprises a body 10 in which a syringe reservoir 12 is movably movable. The latter is provided, at a proximal end, with an injection needle 14.
  • a piston 16 comprising a wall end seal 17 extended by a piston rod 18, is engaged at the distal end of the reservoir 12.
  • the piston rod 18 is independent of the seal wall 17 and is simply supported thereon.
  • An injection spring 20 is disposed inside the piston rod
  • a spring 22 for returning the piston rod surrounds the piston rod 18 and s' presses on the one hand on a cap 24 extending the piston rod at its distal end, and on the other hand on a retaining ring 26 initially holding the return spring 22 compressed.
  • the return spring 22 of the piston rod has a force greater than that of the injection spring 20.
  • a spring 23 for returning the reservoir is also arranged between the body 10 and the reservoir 12.
  • the return spring 23 has a force less than that of the injection spring 20.
  • the automatic injector has a manually releasable locking button 28. It is suitable for preventing accidental triggering of the injector.
  • the injector also comprises a removable cap 30 for protecting the injection needle 14.
  • the body 10 of the injector comprises on the one hand an external handle 32 and on the other hand a trigger 34, one end of which projects at the proximal end of the handle.
  • the trigger 34 is mounted to slide axially inside the handle 32.
  • the handle 32 is formed by a tube open at its proximal end and closed at its distal end by a transverse partition 36.
  • An axial pin 38 extends inside the handle.
  • the trigger 34 is formed by a tube of constant thickness open at its two ends. It has four successive sections of decreasing diameter from its distal end received inside the handle 32 to its proximal end projecting from the handle. These successive sections are noted 34A, 34B, 34C, 34D from the proximal end to the distal end. Thus, shoulders separate the successive sections of the trigger 34. They are noted successively 35A, 35B, 35C.
  • the distal section 34D of the trigger has an outside diameter slightly smaller than the inside diameter of the handle in order to allow the trigger to slide therein.
  • the proximal section 34A of the trigger has a stop 40 formed by a triangular rib, a radial front of which is disposed slightly in front of the shoulder 35A separating the two successive proximal sections 34A, 34B of the trigger.
  • the locking button 28 comprises a fixing sleeve 42 adapted to engage between the open end of the handle 32 and the second section 34C of the trigger.
  • This sleeve 42 is extended by a flange 44 whose external circumference is adapted to rest on the proximal end of the handle 32 and whose internal circumference is adapted to retain the trigger 34 inside the handle 32 for - Mant a stop cooperating with the shoulder 35B formed between the two intermediate sections 34B, 34C of the trigger.
  • the locking button 28 comprises an elastic blade 46 made integrally with the sleeve 42 and the flange 44.
  • This elastic blade 46 is curved and has a first section of manual actuation 46A s' extending substantially parallel to the trigger 34 and a second locking section 46B extending perpendicular to the axis of the trigger.
  • This second section 46B comprises a lu- die 48 in which is engaged the end section 34A of smaller diameter of the trigger.
  • the second arm 46B is received between the stop 40 and the shoulder 35A separating the two outer sections of the trigger.
  • the wall delimiting the light 48 is interposed between the stop 40 and the shoulder 35A.
  • the reservoir 12 is formed by a cylindrical tube whose diameter is slightly smaller than the inside diameter of the proximal section 34A of the trigger.
  • the tube is closed at its proximal end by a wall carrying the injection needle 14. Its other end is open and is bordered externally by a flange 50.
  • the return spring 23 of the reservoir is interposed between the first shoulder 35A of the trigger and the flange 50. It extends essentially over the length of the intermediate sections 34B, 34C of the trigger 34 and provides a guide for the reservoir 12 inside the trigger 34.
  • the wall 17 is formed, for example, by a rubber pad placed in front of the piston rod 18. This pad ensures a tight sliding in the reservoir 12.
  • the piston rod 18 is formed by a cylindrical tube, the internal diameter of which corresponds substantially to the external diameter of the pin 38.
  • the piston rod is closed at its proximal end by the bottom 18A, resting on the wall 17.
  • the cap 24 extending, at its distal end, the piston rod 18 comprises a set of elastic legs bent towards the proximal end of the injector.
  • the legs which are distributed along the periphery of the cap, are shown in the same plane. They will be described successively in the following description.
  • a first elastic leg, denoted 23, has externally, at its end, two successive projections denoted 54, 56.
  • the end stop 56 carries a cam surface 58 adapted to be biased by the beveled distal end of the trigger 34.
  • the projection 54, arranged behind the first projection 56, has a front shoulder adapted to cooperate with a stop 60 formed by a projection formed on the inner lateral surface of the handle 32.
  • the elasticity of the leg 23 keeps the projection 54 and the stop 60 in engagement, thus ensuring an elastic engagement.
  • the projections 54, 56 and the stop 60 constitute means for retaining the injection spring 20 housed inside the piston rod 18.
  • the return spring 22 of the piston rod bears at one end on the bottom of the cap 24.
  • the retaining ring 26 retains this initially compressed inside the cap.
  • the ring 26 has a tubular retaining section 62 on which the proximal end of the spring 22 rests. This tubular section has a diameter slightly greater than the diameter of the piston rod 18.
  • a first leg carrying a radial stop 64 extends the cylindrical section 62. The radial stop 64 is adapted to cooperate with the shoulder 35C connecting the distal section 34C of the trigger to the rest of the structure thereof.
  • a second elastic leg 66 extends the cylindrical section 62.
  • This leg has an elastic tab moving away from the piston rod 18. It has at its end two successive external projections 68, 70.
  • the projection 68, formed at the end of the lug carries a cam surface 69 adapted to cooperate with the shoulder 35C of the trigger.
  • the second projection 70 has a radial front adapted to cooperate with a stop 72 carried by a leg 74 of the cap 24.
  • the leg 66 is elastic and ensures an elastic engagement of the projection 70 behind the stop 72.
  • the reservoir 12 provided with the cap 30 is first filled with the liquid to be injected, then the buffer 17 is put in place, thus ensuring the confinement of the liquid in the reservoir.
  • the reservoir 12 thus filled constitutes an independent element which can be kept apart from the other constituents of the injector.
  • the injection spring 20 is then housed inside the piston rod 18.
  • the piston rod 18 is finally pressed into the handle 32 until the projection 54 engages behind the stop 60, thus retaining the compressed injection spring.
  • the trigger 34 is first introduced inside the sleeve 42 of the locking button.
  • the return spring 23 is then placed in the trigger 34 and the reservoir filled with liquid is finally threaded into the trigger along the axis of the spring 23.
  • the distal part of the injector is engaged on the proximal part of the injector.
  • the sleeve 42 of the locking button is secured to the handle 32 by force fitting or gluing.
  • the operator first removes the protective cap 30.
  • the locking button 28 is pressed, in the direction of the arrow F1, so that the light 48 is opposite the stop 40.
  • the operator applies the proximal end of the trigger to the surface S from the patient's skin.
  • the locking button 28 being released, the trigger 34 then moves, in the direction of the arrow F2, relative to the handle 32 held in the operator's hand.
  • the relative movement of the trigger and the handle causes the release of the latching means retaining the injection spring 20.
  • the distal end of the trigger spreads the jamb 23 by acting on the cam surface 58, this which releases the projection 54 from the stop 60.
  • the reservoir 12 is first moved towards the proximal end of the injector so that the needle 14 enters the patient's flesh. During this movement, the guide spring 23 is compressed.
  • the piston rod 18 is biased towards the distal end of the injector. It thus frees the buffer 17 and the reservoir 12 from any axial stress, allowing the retraction of the reservoir 12 and of the needle 14 inside the proximal section 34A of the trigger under the action of the reservoir return spring 23.
  • the return of the piston rod under the action of the return spring 22 is made possible despite the presence of the injection spring 20, since the force of the return spring is chosen to be greater than the force of the injection spring.
  • the use of a return spring acting on the piston makes it possible to have an automatic injector of great reliability, since the force applied to the flange during the return of the tank is relatively low, the force necessary to overcome the action of the injection spring being produced by the return spring of the piston rod which does not act on the reservoir.
  • the reservoir return spring 23 can be omitted.
  • the piston rod 18 is secured, for example by screwing, to the buffer 17. Also, when the piston rod 18 is returned under the action of the return spring 22 of the piston rod, the buffer 17 and the reservoir 12 are also driven. In fact, the small diameter of the injection needle 14 does not allow the syringe to be filled when the one-piece piston 16 is returned by the return spring 22. Thus, the return spring 22 drives both the piston 16 and the reservoir 12, which allows the needle to be retracted.
  • the assembly of the injector is facilitated by the fact that, during assembly, the return spring is carried by the piston and forms with the piston rod a unitary assembly which can be easily introduced into the body of the injector.

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  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (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 invention concerns an automatic injector comprising a syringe reservoir (12) provided with an injection needle (14) and mounted mobile in the injector body (10), between a retracted position in the body, and an injection position. It comprises an injection piston (16, 18), first elastic means (20), adapted to stress the piston (16, 18) to cause the projection of the needle and the injection of the liquid contained in the reservoir, and second elastic means (22), adapted to return the reservoir (12) towards its retracted position. The second elastic means (22) have a force greater than that of the first elastic means (20). The injector further comprises means for automatically triggering the second elastic means (22) after injection. The second elastic means (22) are adapted to act at least partially between the injector body (10) and the piston (16, 18), when the reservoir (12) is returned.

Description

"Injecteur automatique à rétraction d'aiguille en fin d'in¬ jection"Automatic injector needle retraction at the end of ejection in ¬
La présente invention concerne un injecteur automatique, du type comportant un corps, un réservoir de seringue muni d'une aiguille d'injection et monté déplaçable dans le corps de l'injecteur, entre une position escamotée dans le corps, dans laquelle l'aiguille est logée à l'intérieur du corps, et une position d'injection, dans laquelle l'aiguille fait saillie en dehors du corps, un piston d'injection mobile dans le réservoir de seringue, des premiers moyens élastiques initialement comprimés, adaptés pour la sollicitation du piston afin de provoquer la sortie de l'aiguille du corps de l'injecteur et l'injection du fluide contenu dans le réservoir, et des seconds moyens élastiques, adaptés pour le rappel du réservoir vers sa position escamotée, l'injecteur comportant en outre des moyens de déclenchement des premiers moyens élastiques et des moyens de déclenchement automatique des seconds moyens élastiques en fin d'injection.The present invention relates to an automatic injector, of the type comprising a body, a syringe reservoir provided with an injection needle and mounted movable in the body of the injector, between a retracted position in the body, in which the needle is housed inside the body, and an injection position, in which the needle protrudes outside the body, a movable injection piston in the syringe tank, first elastic means initially compressed, suitable for the biasing of the piston in order to cause the needle to exit the body of the injector and the injection of the fluid contained in the reservoir, and second elastic means, adapted for returning the reservoir to its retracted position, the injector comprising furthermore means for triggering the first elastic means and means for automatically triggering the second elastic means at the end of injection.
Un tel injecteur est décrit par exemple dans la demande FR-A- 2.715.071 déposée au nom de Laboratoire Aguettant Société Anonyme.Such an injector is described for example in application FR-A-2,715,071 filed in the name of Laboratoire Aguettant Société Anonyme.
L'injecteur automatique décrit dans ce document comporte deux ressorts antagonistes, dont l'un est adapté pour la sortie de l'aiguille et l'injection, et l'autre est adapté pour le rappel du réservoir portant l'aiguille dans le corps de l'injecteur en fin d'injection. Le ressort de rappel du réservoir est adapté pour agir entre un épaulement inférieur du corps de l'injecteur et une collerette du réservoir mobile.The automatic injector described in this document comprises two opposing springs, one of which is adapted for the output of the needle and the injection, and the other is adapted for the return of the reservoir carrying the needle in the body of the injector at the end of injection. The reservoir return spring is adapted to act between a lower shoulder of the injector body and a flange of the mobile reservoir.
Le ressort de rappel du réservoir agissant à rencontre du ressort d'injection pour la rétraction de l'aiguille dans le corps, la force du ressort de rappel doit être supérieure à celle du ressort d'injection. Aussi, le ressort de rappel étant très puissant, il exerce une force de très forte intensité sur la collerette du réservoir.Since the reservoir return spring acts against the injection spring for the retraction of the needle into the body, the force of the return spring must be greater than that of the injection spring. Also, the return spring being very powerful, it exerts a force of very high intensity on the collar of the reservoir.
Il convient donc que le réservoir et notamment la collerette soit adaptée pour supporter un effort très important. Les seringues classiques largement diffusées ne sont pas adaptées pour résister à de telles contraintes, et leur emploi dans l'injecteur automatique risque de conduire à un bris de la collerette, rendant l'injecteur inutilisable. Aussi, avec un injecteur tel que décrit dans ce document, il est nécessaire d'utiliser des réservoirs munis d'une collerette résistante et notamment renforcée par rapport à celles des seringues communément utilisées. L'invention a pour but de fournir un injecteur automatique comportant des moyens d'escamotage de l'aiguille en fin d'injection, permettant l'usage de réservoir courant sans risque de rupture de la collerette.It is therefore necessary that the reservoir and in particular the collar is adapted to withstand a very large effort. Conventional widely used syringes are not adapted to withstand such constraints, and their use in the automatic injector risks leading to a breakage of the flange, rendering the injector unusable. Also, with an injector as described in this document, it is necessary to use reservoirs provided with a resistant flange and in particular reinforced compared to those of the syringes commonly used. The object of the invention is to provide an automatic injector comprising means for retracting the needle at the end of injection, allowing the use of a current reservoir without risk of breaking the collar.
A cet effet, l'invention a pour objet un injecteur automatique du type précité, caractérisé en ce que les seconds moyens élastiques sont adaptés pour agir au moins partiellement entre le corps de l'injecteur et le piston, lors du rappel du réservoir.To this end, the invention relates to an automatic injector of the aforementioned type, characterized in that the second elastic means are adapted to act at least partially between the body of the injector and the piston, when the reservoir is returned.
Suivant des modes particuliers de réalisation, l'injecteur automatique comporte l'une ou plusieurs des caractéristiques suivantes :According to particular embodiments, the automatic injector includes one or more of the following characteristics:
- les seconds moyens élastiques comportent un ressort iπitiallement comprimé porté par le piston, le ressort et le piston formant un équipage mobile, déplaçable par rapport au corps lors de la sortie de l'aiguille et de l'injection ;- The second elastic means comprise a compressed iπitiallement spring carried by the piston, the spring and the piston forming a movable assembly, movable relative to the body during the exit of the needle and injection;
- les moyens de déclenchement automatique des seconds moyens élastiques comportent une bague de retenue du ressort, montée coulissante sur le piston et sur laquelle s'appuie une extrémité du ressort, l'autre extrémité s'appuyant sur le piston, la bague et le piston comportant des moyens associés de solidarisation l'un à l'autre pour maintenir le ressort initialement comprimé, la bague et le corps comportent des moyens associés adaptés pour dégager les moyens de solidarisation par coopération de la bague avec le corps en fin d'injection, libérant ainsi le ressort, et la bague comporte une butée de blocage contre le corps, assurant l'appui sur le corps de l'extrémité du ressort en appui sur la bague ;the automatic triggering means of the second elastic means comprise a spring retaining ring, slidingly mounted on the piston and on which one end of the spring rests, the other end resting on the piston, the ring and the piston comprising associated means for securing each other to keep the spring initially compressed, the ring and the body comprise associated means adapted to release the securing means by cooperation of the ring with the body at the end of injection, thus releasing the spring, and the ring includes a blocking stop against the body, ensuring the support on the body of the end of the spring bearing on the ring;
- les moyens associés de solidarisation de la bague au piston comportent des moyens en saillie et en creux d'enclenchement élastique ; - les moyens de dégagement comportent, portées par la bague et le corps, une surface de came et une contre came adaptées pour coopérer en vue du dégagement des moyens de solidarisation lors du déplacement du piston par rapport au corps ;- The associated means for securing the ring to the piston include protruding and hollow means of elastic engagement; - The release means comprise, carried by the ring and the body, a cam surface and a cam follower adapted to cooperate in view of the release of the securing means when the piston moves relative to the body;
- le piston comporte une tige de piston tubulaire et les premiers moyens élastiques sont disposés dans l'espace cylindrique central délimité par la tige de piston tubulaire et prennent appui d'une part sur le corps et d'autre part sur le piston ;- The piston comprises a tubular piston rod and the first elastic means are arranged in the central cylindrical space delimited by the tubular piston rod and bear on the one hand on the body and on the other hand on the piston;
- les moyens de déclenchement des premiers moyens élastiques comportent, portés par le corps et le piston, des moyens de solidarisation du corps et du piston et le corps comporte des moyens de dégagement des moyens de solidarisation ;- The triggering means of the first elastic means comprise, carried by the body and the piston, means for securing the body and the piston and the body comprises means for releasing the securing means;
- le corps comporte une poignée et un déclencheur montés coulissants axialement l'un dans l'autre, le déclencheur comportant une surface de came de dégagement des moyens de solidarisation ;- The body comprises a handle and a trigger mounted to slide axially one inside the other, the trigger comprising a cam surface for releasing the securing means;
- les seconds moyens élastiques comportent un ressort auxiliaire adapté pour agir entre le réservoir et le corps de l'injecteur ;- The second elastic means comprise an auxiliary spring adapted to act between the reservoir and the body of the injector;
- le ressort auxiliaire est initialement détendu et présente une force inférieure à celle du ressort d'injection, de sorte que le second ressort est comprimable sous l'action des premiers moyens élastiques lors du déplacement du réservoir pour la sortie de l'aiguille ; et - le piston comporte d'une part un tampon coulissant de manière étanche à l'intérieur du réservoir et d'autre part une tige de piston indépendante du tampon et engagée au moins partiellement dans le réservoir, les premiers moyens élastiques étant appliqués sur la tige de piston.- The auxiliary spring is initially relaxed and has a lower force than that of the injection spring, so that the second spring is compressible under the action of the first elastic means during movement of the reservoir for the exit of the needle; and - the piston comprises on the one hand a plug sliding in a sealed manner inside the tank and on the other hand a piston rod independent of the plug and engaged at least partially in the tank, the first elastic means being applied to the piston rod.
L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins sur lesquels :The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to the drawings in which:
- la figure 1 est une vue en coupe longitudinale de l'injecteur automatique selon l'invention dans son état de stockage ;- Figure 1 is a longitudinal sectional view of the automatic injector according to the invention in its storage state;
- la figure 2 est une vue en coupe longitudinale de l'injecteur automa- tique en début d'injection, immédiatement après la sortie de l'aiguille ;FIG. 2 is a view in longitudinal section of the automatic injector at the start of injection, immediately after the needle has left;
- la figure 3 est une vue en coupe longitudinale de l'injecteur automatique lors du début de la rétraction de l'aiguille en fin d'injection ; et - la figure 4 est une vue en coupe longitudinale de l'injecteur automatique en fin de rétraction de l'aiguille dans le corps de l'injecteur.- Figure 3 is a longitudinal sectional view of the automatic injector at the start of the retraction of the needle at the end of injection; and - Figure 4 is a longitudinal sectional view of the automatic injector at the end of retraction of the needle into the body of the injector.
L'injecteur automatique représenté sur les figures comporte un corps 10 dans lequel est monté mobile à coulissement un réservoir de seringue 12. Ce dernier est muni, à une extrémité proximale, d'une aiguille d'injection 14. Un piston 16 comportant une paroi étanche d'extrémité 17 prolongée par une tige de piston 18, est engagé à l'extrémité distale du réservoir 12. La tige de piston 18 est indépendante de la paroi étanche 17 et s'appuie simplement sur celle-ci. Un ressort d'injection 20 est disposé à l'intérieur de la tige de pistonThe automatic injector shown in the figures comprises a body 10 in which a syringe reservoir 12 is movably movable. The latter is provided, at a proximal end, with an injection needle 14. A piston 16 comprising a wall end seal 17 extended by a piston rod 18, is engaged at the distal end of the reservoir 12. The piston rod 18 is independent of the seal wall 17 and is simply supported thereon. An injection spring 20 is disposed inside the piston rod
18 et s'appuie, à une extrémité, sur le fond 18A de la tige de piston et, à son autre extrémité, sur le corps 10. Un ressort 22 de rappel de la tige de piston entoure la tige de piston 18 et s'appuie d'une part sur une coiffe 24 prolongeant la tige de piston à son extrémité distale, et d'autre part sur une bague de retenue 26 maintenant initialement le ressort de rappel 22 comprimé. Le ressort 22 de rappel de la tige de piston a une force supérieure à celle du ressort d'injection 20.18 and is supported, at one end, on the bottom 18A of the piston rod and, at its other end, on the body 10. A spring 22 for returning the piston rod surrounds the piston rod 18 and s' presses on the one hand on a cap 24 extending the piston rod at its distal end, and on the other hand on a retaining ring 26 initially holding the return spring 22 compressed. The return spring 22 of the piston rod has a force greater than that of the injection spring 20.
Un ressort 23 de rappel du réservoir est en outre disposé entre le corps 10 et le réservoir 12. Le ressort de rappel 23 a une force inférieure à celle du ressort d'injection 20.A spring 23 for returning the reservoir is also arranged between the body 10 and the reservoir 12. The return spring 23 has a force less than that of the injection spring 20.
Les ressorts 22 et 23 constituent ensemble des moyens élastiques adaptés pour le rappel du réservoir dans sa position escamotée.The springs 22 and 23 together constitute elastic means suitable for returning the reservoir to its retracted position.
L'injecteur automatique comporte un bouton de verrouillage 28 libérable manuellement. Il est adapté pour interdire un déclenchement acci- dentel de l'injecteur. L'injecteur comporte par ailleurs un capuchon amovible 30 de protection de l'aiguille d'injection 14.The automatic injector has a manually releasable locking button 28. It is suitable for preventing accidental triggering of the injector. The injector also comprises a removable cap 30 for protecting the injection needle 14.
Le corps 10 de l'injecteur comporte d'une part une poignée externe 32 et d'autre part un déclencheur 34, dont une extrémité fait saillie à l'extrémité proximale de la poignée. Le déclencheur 34 est monté coulissant axialement à l'intérieur de la poignée 32. La poignée 32 est formée par un tube ouvert à son extrémité proximale et obturé à son extrémité distale par une cloison transversale 36. Un pion axial 38 s'étend à l'intérieur de la poignée.The body 10 of the injector comprises on the one hand an external handle 32 and on the other hand a trigger 34, one end of which projects at the proximal end of the handle. The trigger 34 is mounted to slide axially inside the handle 32. The handle 32 is formed by a tube open at its proximal end and closed at its distal end by a transverse partition 36. An axial pin 38 extends inside the handle.
Le déclencheur 34 est formé par un tube d'épaisseur constante ou- vert à ses deux extrémités. Il comporte quatre sections successives de diamètre décroissant depuis son extrémité distale reçue à l'intérieur de la poignée 32 jusqu'à son extrémité proximale faisant saillie par rapport à la poignée. Ces tronçons successifs sont notés 34A, 34B, 34C, 34D depuis l'extrémité proximale jusqu'à l'extrémité distale. Ainsi, des épaulements sépa- rent les tronçons successifs du déclencheur 34. Ils sont notés successivement 35A, 35B, 35C.The trigger 34 is formed by a tube of constant thickness open at its two ends. It has four successive sections of decreasing diameter from its distal end received inside the handle 32 to its proximal end projecting from the handle. These successive sections are noted 34A, 34B, 34C, 34D from the proximal end to the distal end. Thus, shoulders separate the successive sections of the trigger 34. They are noted successively 35A, 35B, 35C.
Le tronçon distal 34D du déclencheur présente un diamètre extérieur légèrement inférieur au diamètre intérieur de la poignée afin de permettre le coulissement du déclencheur dans celle-ci. Le tronçon proximal 34A du déclencheur comporte une butée 40 formée par une nervure triangulaire, dont un front radial est disposé légèrement en avant de l'epaulement 35A séparant les deux tronçons proximaux successifs 34A, 34B du déclencheur.The distal section 34D of the trigger has an outside diameter slightly smaller than the inside diameter of the handle in order to allow the trigger to slide therein. The proximal section 34A of the trigger has a stop 40 formed by a triangular rib, a radial front of which is disposed slightly in front of the shoulder 35A separating the two successive proximal sections 34A, 34B of the trigger.
Le bouton de verrouillage 28 comporte un manchon de fixation 42 adapté pour s'engager entre l'extrémité ouverte de la poignée 32 et le second tronçon 34C du déclencheur. Ce manchon 42 est prolongé par une collerette 44 dont la circonférence externe est adaptée pour s'appuyer sur l'extrémité proximale de la poignée 32 et dont la circonférence interne est adaptée pour retenir le déclencheur 34 à l'intérieur de la poignée 32 en for- mant une butée coopérant avec l'epaulement 35B ménagé entre les deux tronçons intermédiaires 34B, 34C du déclencheur.The locking button 28 comprises a fixing sleeve 42 adapted to engage between the open end of the handle 32 and the second section 34C of the trigger. This sleeve 42 is extended by a flange 44 whose external circumference is adapted to rest on the proximal end of the handle 32 and whose internal circumference is adapted to retain the trigger 34 inside the handle 32 for - Mant a stop cooperating with the shoulder 35B formed between the two intermediate sections 34B, 34C of the trigger.
A l'extérieur du corps 10, le bouton de verrouillage 28 comporte une lame élastique 46 venue de matière avec le manchon 42 et la collerette 44. Cette lame élastique 46 est recourbée et comporte un premier tronçon d'ac- tionnement manuel 46A s'étendant sensiblement parallèlement au déclencheur 34 et un second tronçon de verrouillage 46B s'étendant perpendiculairement à l'axe du déclencheur. Ce second tronçon 46B comporte une lu- mière 48 dans laquelle est engagé le tronçon d'extrémité 34A de plus faible diamètre du déclencheur. Le second bras 46B est reçu entre la butée 40 et l'epaulement 35A séparant les deux tronçons extérieurs du déclencheur. Au repos, c'est-à-dire en l'absence de sollicitation sur le bouton 28, la paroi délimitant la lumière 48 est interposée entre la butée 40 et l'epaulement 35A.Outside the body 10, the locking button 28 comprises an elastic blade 46 made integrally with the sleeve 42 and the flange 44. This elastic blade 46 is curved and has a first section of manual actuation 46A s' extending substantially parallel to the trigger 34 and a second locking section 46B extending perpendicular to the axis of the trigger. This second section 46B comprises a lu- die 48 in which is engaged the end section 34A of smaller diameter of the trigger. The second arm 46B is received between the stop 40 and the shoulder 35A separating the two outer sections of the trigger. At rest, that is to say in the absence of stress on the button 28, the wall delimiting the light 48 is interposed between the stop 40 and the shoulder 35A.
Le réservoir 12 est formé par un tube cylindrique dont le diamètre est légèrement inférieur au diamètre intérieur du tronçon proximal 34A du déclencheur. Le tube est obturé à son extrémité proximale par une paroi por- tant l'aiguille d'injection 14. Son autre extrémité est ouverte et est bordée extérieurement par une collerette 50. Le ressort 23 de rappel du réservoir est interposé entre le premier épaulement 35A du déclencheur et la collerette 50. Il s'étend essentiellement sur la longueur des tronçons intermédiaires 34B, 34C du déclencheur 34 et assure un guide du réservoir 12 à l'inté- rieur du déclencheur 34.The reservoir 12 is formed by a cylindrical tube whose diameter is slightly smaller than the inside diameter of the proximal section 34A of the trigger. The tube is closed at its proximal end by a wall carrying the injection needle 14. Its other end is open and is bordered externally by a flange 50. The return spring 23 of the reservoir is interposed between the first shoulder 35A of the trigger and the flange 50. It extends essentially over the length of the intermediate sections 34B, 34C of the trigger 34 and provides a guide for the reservoir 12 inside the trigger 34.
La paroi 17 est formée, par exemple, par un tampon en caoutchouc disposé en avant de la tige de piston 18. Ce tampon assure un coulisse- ment étanche dans le réservoir 12.The wall 17 is formed, for example, by a rubber pad placed in front of the piston rod 18. This pad ensures a tight sliding in the reservoir 12.
La tige de piston 18 est formée par un tube cylindrique dont le dia- mètre intérieur correspond sensiblement au diamètre extérieur du pion 38. La tige de piston est obturée à son extrémité proximale par le fond 18A, s'appuyant sur la paroi 17.The piston rod 18 is formed by a cylindrical tube, the internal diameter of which corresponds substantially to the external diameter of the pin 38. The piston rod is closed at its proximal end by the bottom 18A, resting on the wall 17.
La coiffe 24 prolongeant, à son extrémité distale, la tige de piston 18 comporte un ensemble de jambages élastiques recourbés vers l'extrémité proximale de l'injecteur. Pour des raisons de clarté des dessins, les jambages, qui sont répartis suivant la périphérie de la coiffe, sont représentés dans un même plan. Ils seront décrits successivement dans la suite de la description.The cap 24 extending, at its distal end, the piston rod 18 comprises a set of elastic legs bent towards the proximal end of the injector. For reasons of clarity of the drawings, the legs, which are distributed along the periphery of the cap, are shown in the same plane. They will be described successively in the following description.
Un premier jambage élastique, notée 23, comporte extérieurement, à son extrémité, deux saillies successives notées 54, 56. La butée d'extrémité 56 porte une surface de came 58 adaptée pour être sollicitée par l'extrémité distale biseautée du déclencheur 34. La saillie 54, disposée en arrière de la première saillie 56, présente un épaulement avant adapté pour coopérer avec une butée 60 formée d'une saillie ménagée sur la surface latérale intérieure de la poignée 32.A first elastic leg, denoted 23, has externally, at its end, two successive projections denoted 54, 56. The end stop 56 carries a cam surface 58 adapted to be biased by the beveled distal end of the trigger 34. The projection 54, arranged behind the first projection 56, has a front shoulder adapted to cooperate with a stop 60 formed by a projection formed on the inner lateral surface of the handle 32.
L'élasticité du jambage 23 maintient en prise la saillie 54 et la butée 60 assurant ainsi un enclenchement élastique.The elasticity of the leg 23 keeps the projection 54 and the stop 60 in engagement, thus ensuring an elastic engagement.
Les saillies 54, 56 et la butée 60 constituent des moyens de retenue du ressort d'injection 20 logé à l'intérieur de la tige de piston 18.The projections 54, 56 and the stop 60 constitute means for retaining the injection spring 20 housed inside the piston rod 18.
Le ressort 22 de rappel de la tige de piston s'appuie à une extrémité sur le fond de la coiffe 24. La bague de retenue 26 retient celui-ci initiale- ment comprimé à l'intérieur de la coiffe.The return spring 22 of the piston rod bears at one end on the bottom of the cap 24. The retaining ring 26 retains this initially compressed inside the cap.
La bague 26 comporte un tronçon tubulaire de maintien 62 sur lequel s'appuie l'extrémité proximale du ressort 22. Ce tronçon tubulaire a un diamètre légèrement supérieur au diamètre de la tige de piston 18. Un premier jambage portant une butée radiale 64 prolonge le tronçon cylindrique 62. La butée radiale 64 est adaptée pour coopérer avec l'epaulement 35C reliant le tronçon distal 34C du déclencheur au reste de la structure de celui-ci.The ring 26 has a tubular retaining section 62 on which the proximal end of the spring 22 rests. This tubular section has a diameter slightly greater than the diameter of the piston rod 18. A first leg carrying a radial stop 64 extends the cylindrical section 62. The radial stop 64 is adapted to cooperate with the shoulder 35C connecting the distal section 34C of the trigger to the rest of the structure thereof.
Un second jambage élastique 66 prolonge le tronçon cylindrique 62. Ce jambage comporte une patte élastique s'éloignant de la tige de piston 18. Elle comporte à son extrémité deux saillies extérieures successives 68, 70. La saillie 68, ménagée à l'extrémité de la patte, porte une surface de came 69 adaptée pour coopérer avec l'epaulement 35C du déclencheur. La seconde saillie 70 présente un front radial adapté pour coopérer avec une butée 72 portée par un jambage 74 de la coiffe 24. Le jambage 66 est élastique et assure un enclenchement élastique de la saillie 70 en arrière de la butée 72.A second elastic leg 66 extends the cylindrical section 62. This leg has an elastic tab moving away from the piston rod 18. It has at its end two successive external projections 68, 70. The projection 68, formed at the end of the lug carries a cam surface 69 adapted to cooperate with the shoulder 35C of the trigger. The second projection 70 has a radial front adapted to cooperate with a stop 72 carried by a leg 74 of the cap 24. The leg 66 is elastic and ensures an elastic engagement of the projection 70 behind the stop 72.
Pour assurer le montage de la seringue, on remplit d'abord le réservoir 12 muni du capuchon 30 avec le liquide à injecter puis on met en place le tampon 17 assurant ainsi le confinement du liquide dans le réservoir. Le réservoir 12 ainsi rempli constitue un élément indépendant qui peut être conservé à part des autres constituants de l'injecteur.To ensure the mounting of the syringe, the reservoir 12 provided with the cap 30 is first filled with the liquid to be injected, then the buffer 17 is put in place, thus ensuring the confinement of the liquid in the reservoir. The reservoir 12 thus filled constitutes an independent element which can be kept apart from the other constituents of the injector.
Pour le montage de la partie distale de l'injecteur, on place d'abord le ressort 22 sur la tige de piston 18. On assure le verrouillage de celui-ci en position comprimée par l'engagement de la bague de retenue 26 et son en- cliquetage sur la butée 72.To mount the distal part of the injector, first place the spring 22 on the piston rod 18. The latter is locked in place position compressed by the engagement of the retaining ring 26 and its snap-fastening on the stop 72.
Le ressort d'injection 20 est alors logé à l'intérieur de la tige de piston 18. La tige de piston 18 est enfin enfoncée dans la poignée 32 jusqu'à ce que la saillie 54 s'engage en arrière de la butée 60, retenant ainsi le ressort d'injection comprimé.The injection spring 20 is then housed inside the piston rod 18. The piston rod 18 is finally pressed into the handle 32 until the projection 54 engages behind the stop 60, thus retaining the compressed injection spring.
Pour le montage de la partie proximale de l'injecteur, on introduit d'abord le déclencheur 34 à l'intérieur du manchon 42 de bouton de verrouillage. Le ressort de rappel 23 est alors mis en place dans le déclen- cheur 34 et le réservoir empli de liquide est enfin enfilé dans le déclencheur suivant l'axe du ressort 23.For mounting the proximal part of the injector, the trigger 34 is first introduced inside the sleeve 42 of the locking button. The return spring 23 is then placed in the trigger 34 and the reservoir filled with liquid is finally threaded into the trigger along the axis of the spring 23.
Pour l'assemblage final, la partie distale de l'injecteur est engagée sur la partie proximale de l'injecteur. Le manchon 42 du bouton de verrouillage est solidarisé à la poignée 32 par emmanchement à force ou col- lage.For final assembly, the distal part of the injector is engaged on the proximal part of the injector. The sleeve 42 of the locking button is secured to the handle 32 by force fitting or gluing.
On comprend ainsi que le bouton de verrouillage 28, solidaire de la poignée 32 assure la retenue du déclencheur 34 à l'intérieur de la poignée par l'intermédiaire de la collerette 44.It will thus be understood that the locking button 28, integral with the handle 32, retains the trigger 34 inside the handle via the flange 44.
Afin de procéder à l'injection, l'opérateur retire d'abord le capuchon de protection 30.In order to carry out the injection, the operator first removes the protective cap 30.
Comme représenté sur la figure 2, le bouton de verrouillage 28 est enfoncé, suivant le sens de la flèche F1 , de sorte que la lumière 48 soit en regard de la butée 40. L'opérateur applique l'extrémité proximale du déclencheur sur la surface S de la peau du patient. Le bouton de verrouillage 28 étant libéré, le déclencheur 34 se déplace alors, suivant le sens de la flèche F2, par rapport à la poignée 32 retenue dans la main de l'opérateur. Le mouvement relatif du déclencheur et de la poignée provoque la libération des moyens d'encliquetage retenant le ressort d'injection 20. En effet, l'extrémité distale du déclencheur écarte le jambage 23 en agissant sur la sur- face de came 58, ce qui libère la saillie 54 de la butée 60.As shown in FIG. 2, the locking button 28 is pressed, in the direction of the arrow F1, so that the light 48 is opposite the stop 40. The operator applies the proximal end of the trigger to the surface S from the patient's skin. The locking button 28 being released, the trigger 34 then moves, in the direction of the arrow F2, relative to the handle 32 held in the operator's hand. The relative movement of the trigger and the handle causes the release of the latching means retaining the injection spring 20. In fact, the distal end of the trigger spreads the jamb 23 by acting on the cam surface 58, this which releases the projection 54 from the stop 60.
Sous l'action du ressort d'injection 20, le réservoir 12 est d'abord déplacé vers l'extrémité proximale de l'injecteur de sorte que l'aiguille 14 pé- nètre dans les chairs du patient. Lors de ce déplacement, le ressort de guidage 23 se comprime.Under the action of the injection spring 20, the reservoir 12 is first moved towards the proximal end of the injector so that the needle 14 enters the patient's flesh. During this movement, the guide spring 23 is compressed.
Lors du mouvement ultérieur du piston, le liquide contenu dans le réservoir 22 est injecté au travers de l'aiguille 14. Comme représenté sur la figure 3, en fin d'injection, la butée 64 de la bague de verrouillage vient en appui sur l'epaulement 35C du déclencheur 34. La surface de came 69 portée par la butée provoque la déformation du jambage 66 vers la tige de piston suivant le sens de la flèche F3. Ainsi, la saillie 70 est libérée de la butée 72. Comme représenté sur la figure 4, sous l'action du ressort de rappelDuring the subsequent movement of the piston, the liquid contained in the reservoir 22 is injected through the needle 14. As shown in FIG. 3, at the end of injection, the stop 64 of the locking ring comes to bear on the 'shoulder 35C of the trigger 34. The cam surface 69 carried by the stop causes the deformation of the leg 66 towards the piston rod in the direction of the arrow F3. Thus, the projection 70 is released from the stop 72. As shown in FIG. 4, under the action of the return spring
22 ainsi libéré, la tige de piston 18 est sollicitée vers l'extrémité distale de l'injecteur. Elle libère ainsi le tampon 17 et le réservoir 12 de toute sollicitation axiale, permettant la rétraction du réservoir 12 et de l'aiguille 14 à l'intérieur du tronçon proximal 34A du déclencheur sous l'action du ressort 23 de rappel du réservoir.22 thus released, the piston rod 18 is biased towards the distal end of the injector. It thus frees the buffer 17 and the reservoir 12 from any axial stress, allowing the retraction of the reservoir 12 and of the needle 14 inside the proximal section 34A of the trigger under the action of the reservoir return spring 23.
Le rappel de la tige de piston sous l'action du ressort de rappel 22 est rendu possible malgré la présence du ressort d'injection 20, puisque la force du ressort de rappel est choisie supérieure à la force du ressort d'injection. L'utilisation d'un ressort de rappel agissant sur le piston permet de disposer d'un injecteur automatique de grande fiabilité, puisque la force appliquée sur la collerette lors du rappel du réservoir est relativement faible, la force nécessaire pour vaincre l'action du ressort d'injection étant produite par le ressort de rappel de la tige de piston qui n'agit pas sur le réservoir. En variante, le ressort 23 de rappel du réservoir peut être supprimé.The return of the piston rod under the action of the return spring 22 is made possible despite the presence of the injection spring 20, since the force of the return spring is chosen to be greater than the force of the injection spring. The use of a return spring acting on the piston makes it possible to have an automatic injector of great reliability, since the force applied to the flange during the return of the tank is relatively low, the force necessary to overcome the action of the injection spring being produced by the return spring of the piston rod which does not act on the reservoir. Alternatively, the reservoir return spring 23 can be omitted.
Dans ce cas, la tige de piston 18 est solidaire, par exemple par vissage, du tampon 17. Aussi, lors du rappel de la tige de piston 18 sous l'action du ressort de rappel 22 de la tige de piston, le tampon 17 et le réservoir 12 sont également entraînés. En effet, le faible diamètre de l'aiguille d'injection 14 ne permet pas un remplissage de la seringue lors du rappel du piston monobloc 16 par le ressort de rappel 22. Ainsi, le ressort de rappel 22 entraîne à la fois le piston 16 et le réservoir 12, ce qui permet l'escamotage de l'aiguille.In this case, the piston rod 18 is secured, for example by screwing, to the buffer 17. Also, when the piston rod 18 is returned under the action of the return spring 22 of the piston rod, the buffer 17 and the reservoir 12 are also driven. In fact, the small diameter of the injection needle 14 does not allow the syringe to be filled when the one-piece piston 16 is returned by the return spring 22. Thus, the return spring 22 drives both the piston 16 and the reservoir 12, which allows the needle to be retracted.
Le montage de l'injecteur est facilité par le fait que, lors de l'assemblage, le ressort de rappel est porté par le piston et forme avec la tige de piston un ensemble unitaire pouvant être facilement introduit dans le corps de l'injecteur.The assembly of the injector is facilitated by the fact that, during assembly, the return spring is carried by the piston and forms with the piston rod a unitary assembly which can be easily introduced into the body of the injector.
La présence du ressort d'injection à l'intérieur de la tige de piston procure un gain de place à l'intérieur du corps, ce qui permet de disposer le ressort de rappel autour du piston. II est également à noter qu'après usage, les ressorts d'injection et de rappel de la tige de piston sont tous deux détendus, ce qui rend l'injecteur non réutilisable à moins de procéder à son démontage complet. The presence of the injection spring inside the piston rod saves space inside the body, which allows the return spring to be arranged around the piston. It should also be noted that after use, the injection and return springs of the piston rod are both relaxed, which makes the injector non-reusable unless it is completely dismantled.

Claims

REVENDICATIONS 1.- Injecteur automatique, du type comportant un corps (10), un réservoir de seringue (12) muni d'une aiguille d'injection (14) et monté dépla- çable dans le corps (10) de l'injecteur, entre une position escamotée dans le corps, dans laquelle l'aiguille est logée à l'intérieur du corps, et une position d'injection, dans laquelle l'aiguille (14) fait saillie en dehors du corps, un piston d'injection (17, 18) mobile dans le réservoir de seringue (12), des premiers moyens élastiques (20) initialement comprimés, adaptés pour la sollicitation du piston (17, 18) afin de provoquer la sortie de l'aiguille du corps de l'injecteur et l'injection du fluide contenu dans le réservoir, et des seconds moyens élastiques (22, 52), adaptés pour le rappel du réservoir (12) vers sa position escamotée, l'injecteur comportant en outre des moyens de déclenchement des premiers moyens élastiques (20) et des moyens de déclenchement automatique des seconds moyens élastiques (22, 52) en fin d'injection, caractérisé en ce que les seconds moyens élastiques (22, 52) sont adaptés pour agir au moins partiellement entre le corps (10) de l'injecteur et le piston (17, 18), lors du rappel du réservoir (12).CLAIMS 1.- Automatic injector, of the type comprising a body (10), a syringe reservoir (12) provided with an injection needle (14) and mounted movably in the body (10) of the injector, between an retracted position in the body, in which the needle is housed inside the body, and an injection position, in which the needle (14) projects outside the body, an injection piston ( 17, 18) movable in the syringe reservoir (12), first elastic means (20) initially compressed, adapted for the biasing of the piston (17, 18) in order to cause the needle to exit the body of the injector and injecting the fluid contained in the reservoir, and second elastic means (22, 52), adapted for returning the reservoir (12) to its retracted position, the injector further comprising means for triggering the first elastic means (20) and means for automatically triggering the second elastic means (2 2, 52) at the end of injection, characterized in that the second elastic means (22, 52) are adapted to act at least partially between the body (10) of the injector and the piston (17, 18), during of the tank recall (12).
2.- Injecteur automatique selon la revendication 1 , caractérisé en ce que les seconds moyens élastiques (22, 52) comportent un ressort (22) ini- tiallement comprimé porté par le piston (17, 18), le ressort (22) et le piston (17, 18) formant un équipage mobile, déplaçable par rapport au corps (10) lors de la sortie de l'aiguille (14) et de l'injection.2. An automatic injector according to claim 1, characterized in that the second elastic means (22, 52) comprise a spring (22) initially compressed carried by the piston (17, 18), the spring (22) and the piston (17, 18) forming a movable assembly, movable relative to the body (10) when the needle (14) leaves and from the injection.
3.- Injecteur automatique selon la revendication 2, caractérisé en ce que les moyens de déclenchement automatique des seconds moyens élas- tiques (22, 52) comportent une bague (26) de retenue du ressort (22), montée coulissante sur le piston (16,18) et sur laquelle s'appuie une extrémité du ressort (22), l'autre extrémité s'appuyant sur le piston (17, 18), la bague (26) et le piston (17, 18) comportant des moyens associés (70, 72) de solidarisation l'un à l'autre pour maintenir le ressort (22) initialement comprimé, en ce que la bague (26) et le corps (10) comportent des moyens associés (68, 35B) adaptés pour dégager les moyens de solidarisation par coopération de la bague avec le corps (10) en fin d'injection, libérant ainsi le ressort (22), et en ce que la bague (26) comporte une butée (64) de blocage contre le corps (10), assurant l'appui sur le corps (10) de l'extrémité du ressort (22) en appui sur la bague (26).3. An automatic injector according to claim 2, characterized in that the means for automatically triggering the second elastic means (22, 52) comprise a ring (26) for retaining the spring (22), mounted slidingly on the piston ( 16,18) and on which one end of the spring (22) rests, the other end resting on the piston (17, 18), the ring (26) and the piston (17, 18) comprising means associated (70, 72) integral with one another to keep the spring (22) initially compressed, in that the ring (26) and the body (10) comprise associated means (68, 35B) suitable for release the securing means by cooperation of the ring with the body (10) at the end of injection, thereby releasing the spring (22), and in that the ring (26) comprises a stop (64) for locking against the body (10), ensuring the support on the body (10) of the end of the spring (22) in support on the ring (26).
4.- Injecteur automatique selon la revendication 3, caractérisé en ce que les moyens associés de solidarisation de la bague (26) au piston (17, 18) comportent des moyens (70, 72) en saillie et en creux d'enclenchement élastique.4. An automatic injector according to claim 3, characterized in that the associated means for securing the ring (26) to the piston (17, 18) comprise means (70, 72) projecting and hollow for elastic engagement.
5.- Injecteur automatique selon la revendication 3 ou 4, caractérisé en ce que les moyens de dégagement comportent, portées par la bague (26) et le corps (10), une surface de came (68) et une contre came (35B) adaptées pour coopérer en vue du dégagement des moyens de solidarisation (70, 72) lors du déplacement du piston (17, 18) par rapport au corps (10).5. An automatic injector according to claim 3 or 4, characterized in that the release means comprise, carried by the ring (26) and the body (10), a cam surface (68) and a counter cam (35B) adapted to cooperate with a view to releasing the securing means (70, 72) when the piston (17, 18) moves relative to the body (10).
6.- Injecteur automatique selon l'une quelconque des revendications précédentes, caractérisé en ce que le piston (17, 18) comporte une tige de piston tubulaire (18) et en ce que les premiers moyens élastiques (20) sont disposés dans l'espace cylindrique central délimité par la tige de piston tubulaire (18) et prennent appui d'une part sur le corps (10) et d'autre part sur le piston (17, 18). 6. An automatic injector according to any one of the preceding claims, characterized in that the piston (17, 18) comprises a tubular piston rod (18) and in that the first elastic means (20) are arranged in the central cylindrical space delimited by the tubular piston rod (18) and bear on the one hand on the body (10) and on the other hand on the piston (17, 18).
7.- Injecteur automatique selon la revendication 6, caractérisé en ce que les moyens de déclenchement des premiers moyens élastiques (20) comportent portés par le corps (10) et le piston (17, 18), des moyens (54, 60) de solidarisation du corps (10) et du piston (17, 18) et en ce que le corps (10) comporte des moyens de dégagement des moyens de solidari- sation.7. An automatic injector according to claim 6, characterized in that the means for triggering the first elastic means (20) comprise, carried by the body (10) and the piston (17, 18), means (54, 60) of joining the body (10) and the piston (17, 18) and in that the body (10) comprises means for releasing the joining means.
8.- Injecteur automatique selon la revendication 7, caractérisé en ce que le corps (10) comporte une poignée (32) et un déclencheur (34) montés coulissants axialement l'un dans l'autre, le déclencheur (34) comportant une surface de came (58) de dégagement des moyens de solidarisation (54, 60).8. An automatic injector according to claim 7, characterized in that the body (10) comprises a handle (32) and a trigger (34) slidably mounted axially in one another, the trigger (34) having a surface cam (58) for releasing the securing means (54, 60).
9.- Injecteur automatique selon l'une quelconque des revendications précédentes, caractérisé en ce que les seconds moyens élastiques (22, 52) comportent un ressort auxiliaire (52) adapté pour agir entre le réservoir (12) et le corps (10) de l'injecteur.9. An automatic injector according to any one of the preceding claims, characterized in that the second elastic means (22, 52) comprise an auxiliary spring (52) adapted to act between the reservoir (12) and the body (10) of the injector.
10.- Injecteur automatique selon la revendication 9, caractérisé en ce que le ressort auxiliaire (52) est initialement détendu et présente une force inférieure à celle du ressort d'injection, de sorte que le second ressort est comprimable sous l'action des premiers moyens élastiques (20) lors du déplacement du réservoir (12) pour la sortie de l'aiguille (14).10. An automatic injector according to claim 9, characterized in that the auxiliary spring (52) is initially relaxed and has a force less than that of the injection spring, so that the second spring is compressible under the action of the first elastic means (20) during movement of the reservoir (12) for the exit of the needle (14).
11. - Injecteur selon la revendication 9 ou 10, caractérisé en ce que le piston (17, 18) comporte d'une part un tampon (17) coulissant de manière étanche à l'intérieur du réservoir (12) et d'autre part une tige de piston (18) indépendante du tampon (17) et engagée au moins partiellement dans le réservoir (12), les premiers moyens élastiques (20) étant appliqués sur la tige de piston (18). 11. - Injector according to claim 9 or 10, characterized in that the piston (17, 18) comprises on the one hand a buffer (17) sliding in leaktight manner inside the tank (12) and on the other hand a piston rod (18) independent of the buffer (17) and engaged at least partially in the reservoir (12), the first elastic means (20) being applied to the piston rod (18).
PCT/FR1998/002342 1997-11-05 1998-11-02 Automatic injector with needle retraction after injection WO1999022789A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU10386/99A AU1038699A (en) 1997-11-05 1998-11-02 Automatic injector with needle retraction after injection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR97/13921 1997-11-05
FR9713921A FR2770404B1 (en) 1997-11-05 1997-11-05 AUTOMATIC INJECTOR WITH NEEDLE RETRACTION AT THE END OF INJECTION

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FR (1) FR2770404B1 (en)
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FR2770404B1 (en) 2000-01-28
FR2770404A1 (en) 1999-05-07
AU1038699A (en) 1999-05-24

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