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EP0851774A1 - Linear-transmission syringe plunger - Google Patents

Linear-transmission syringe plunger

Info

Publication number
EP0851774A1
EP0851774A1 EP96919518A EP96919518A EP0851774A1 EP 0851774 A1 EP0851774 A1 EP 0851774A1 EP 96919518 A EP96919518 A EP 96919518A EP 96919518 A EP96919518 A EP 96919518A EP 0851774 A1 EP0851774 A1 EP 0851774A1
Authority
EP
European Patent Office
Prior art keywords
syringe
aggregate
syringe body
seal
syringe plunger
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.)
Withdrawn
Application number
EP96919518A
Other languages
German (de)
French (fr)
Inventor
Jean-Claude Berney
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 EP0851774A1 publication Critical patent/EP0851774A1/en
Withdrawn legal-status Critical Current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
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M5/14546—Front-loading type injectors
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/31518—Piston or piston-rod constructions, e.g. connection of piston with piston-rod designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/3152—Piston or piston-rod constructions, e.g. connection of piston with piston-rod including gearings to multiply or attenuate the piston displacing force
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/60—General characteristics of the apparatus with identification means
    • A61M2205/6018—General characteristics of the apparatus with identification means providing set-up signals for the apparatus configuration
    • 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
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M5/14566—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons with a replaceable reservoir for receiving a piston rod of the pump
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod

Definitions

  • the plunger-syringe system In all areas where liquids have to be dispensed, the plunger-syringe system is widely used and appreciated for its ease of use. In the medical field in particular, it is universally widespread for practicing drug injections. In the majority of cases, these are short-term manual injections where the injection speed does not have to be precisely controlled. However, there are more and more frequent cases where the drugs must no longer be injected but infused, that is to say administered slowly over time, and this in a perfectly measured manner. For this there are different types of pumps whose flow can be programmed precisely. One of the solutions consists in using a "syringe pump", that is to say a motorized system making it possible to linearly push the piston at a speed corresponding to the desired flow rate.
  • a first problem resides in the filling system of the syringe. Using pre-filled syringes limits potential uses of the system. Furthermore, the use of an overly sophisticated system can be penalizing. It is therefore beneficial to get as close as possible to the current filling system which is easy to assimilate, quick and efficient.
  • a second problem lies in the means of linear transmission between the motorization system and the piston.
  • these means are integral with the motorization system and it is necessary to reset them to 0 before any new use, which represents a relatively complex additional manipulation.
  • disposable type means provided for a single use. It is therefore important that the filling and commissioning operations of the device remain very simple. It is the aim of the present invention to provide an effective solution to this problem.
  • a syringe plunger for infusion comprising a seal intended to seal between the syringe body and the plunger, the latter being characterized in that it comprises an aggregate formed by a plurality of mechanical parts comprising at less linear transmission means arranged to be driven by external control and motorization means and a support for these transmission means, said piston also comprising removable means arranged so as to be able to freely move said aggregate inside the body syringe before commissioning, and means arranged to fix the aggregate at least indirectly to the syringe body during commissioning.
  • Figures la and lb show by way of example a syringe plunger according to the invention in the pushed position and in the pulled position.
  • FIG. 2 shows by way of example the piston with its seal and the mechanical unit with its support, its linear transmission means and a removable pull tab for carrying out the filling operations before putting into service.
  • Figures 3a and 3b show the piston fixed by the syringe body by an intermediate fastener in the starting position and in the fully deployed position.
  • FIG. 4 shows by way of example a double action filling puller for piston according to the invention.
  • FIG. 5 shows by way of example coding means making it possible to transmit to the control and motorization means information concerning the characteristics of the piston.
  • Figures la and lb show a syringe body 1 which can be a standard syringe body as currently used for the injection of medicaments or other liquid substances.
  • a piston comprising the seal 2 making it possible to seal between the syringe body 1 and the piston.
  • This seal 2 is mounted on a mechanical aggregate 3.
  • This aggregate 3 comprises, among other things, linear transmission means formed by a combination of mother screws 4 and a support 5.
  • This support 5 slides freely in the syringe body 1, so much so that the friction force between the piston and the syringe body is given essentially by the friction of the seal 2 on the syringe body 1.
  • a removable pull tab 6 makes it possible to move the entire piston.
  • the piston is in the pushed position ez the volume of the reservoir formed between the syringe body 1 and the seal 2 is practically zero.
  • FIG. 2 we have an example of a piston according to the invention on which we find the seal 20 and the mechanical aggregate comprising the support 21.
  • a lead screw 22 driven by a transmission wheel 23.
  • a first telescopic element 24 on which is mounted a second telescopic element 25.
  • the seal 20 is mounted on the telescopic element 25.
  • the elements 22, 24 and 25 have the same pitch and all of the elements 22, 23, 24 and 25 form the means of linear transmission.
  • the telescopic elements 24 and 25 deploy linearly at a speed which is directly proportional to the speed of rotation of the mother screw 22.
  • the seal must not be rotated, which may be the case if the section of the syringe body is circular.
  • a guide system formed for example of an intermediate part 26 which is deployed between the telescopic element 25 which carries the seal 20 and the support 21, and prevents these two parts from rotating one by compared to each other.
  • the piston comprises a metallic piece of annular shape 27 fixed on the support 21. This piece makes it possible to fix the aggregate to the syringe body as we will describe later.
  • the aggregate is fixed relative to the syringe body, which could be done with fixing means integrated directly in the support of the aggregate .
  • the aggregate is fixed by its support 35 inside an intermediate fixing piece 36.
  • This piece has an annular magnet 37.
  • this magnet 37 comes opposite the annular metal part 38 of the support. If this part is for example made of ferrous metal, the magnetic force of retention enters the magnet 37 and the metal part 38 makes it possible to fix the aggregate to the intermediate fixing part 36.
  • this intermediate piece 36 can be attached to the syringe body by a bayonet system 39 as is commonly done when using syringes with compressed air.
  • the aggregate was indirectly attached to the syringe body by means of the fixing part 36.
  • the control and motorization means are also fixed to this intermediate part 36. The latter can therefore serve as an adapter . It would thus be possible to use the same control and motorization means with pistons and syringe bodies of different dimensions and capacities, 10 cc, 20 cc, 50 cc, using intermediate pieces 36 of suitable configuration.
  • Figure 3a shows the starting position. In this position, the linear transmission means formed by the lead screw and the two telescopic elements are completely folded back so that the reservoir formed between the syringe body and the seal is maximum.
  • Figure 3b shows the final position. In this position the linear transmission means are fully deployed and the tank is almost empty. When the syringe is completely emptied, the control and motorization means as well as the intermediate piece can be recovered and reused on another syringe. On the other hand, it is preferable to discard the syringe piston assembly with its mechanical aggregate.
  • the piston with its aggregate will therefore preferably be made with synthetic materials so that the price is acceptable, with the exception of the lead screw itself which could be made of metal for reasons that we will see later.
  • FIG 4 shows by way of example a pull tab 40 for moving the piston before commissioning. It has been said that this zipper is removable.
  • this pull tab 40 has a clamp-shaped end 41 which can be opened by means of a rod 42 placed in the center of the pull rod 40.
  • This rod 42 has a conical end 43. By pressing on this rod 42, the conical end 43 opens the clamp 41 which allows the puller 40 to be released.
  • the clamp 41 is connected directly to the transmission wheel 44 which drives the lead screw, these two parts being preferably metallic so as to provide sufficient tensile strength. It is thus possible by means of the pull tab 40 to move the piston assembly linearly to carry out the filling operations of the syringe.
  • FIG. 5 shows, by way of example, means for coding the type of syringe used.
  • the same control and motorization means could be mounted on syringes of different capacities using suitable intermediate parts. If this is the case, the same speed of rotation of these motorization means will produce different flow rates depending on the type of syringe used.
  • One of the most important parameters during infusion therapy is flow.
  • a useful solution to avoid errors and facilitate the programming of the control means consists in introducing a means of coding the plunger / syringe system used which can be read by said control means.
  • this coding is carried out by means of two pins 50 and 51 mounted on the intermediate part 52. These two pins collaborate with two contacts 53 and 54 of the control and motorization means. Depending on the length of the nipples, the corresponding contacts are open or closed. In the configuration shown the contact 53 is closed and the contact 54 open, which corresponds for example to a 10 cc syringe.
  • the two contacts form a 2-bit binary combination that can be read by the control circuit, and which allows the latter to differentiate 4 different types of plunger / syringe systems. To increase the number of possibilities, simply increase the number of contacts.
  • the representation of Figure 5 is schematic, because there are very numerous possibilities known to those skilled in the art for carrying out this kind of coding, with contacts, without contacts, and it is not necessary to go into all the details.

Landscapes

  • 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

A drug infusion syringe plunger comprising an assembly which includes linear transmission means mounted on a holder and made up of a feed screw and at least one telescopic member supporting a seal providing sealing contact between the plunger and the syringe body. A releasable pull member enables the assembly to be moved freely within the syringe body for filling as with a conventional syringe. For actual infusion, the assembly may be fixed to the syringe body and driven by external control and drive means.

Description

Demande de brevet Piston de seringue avec transmission linéaire Patent application Syringe plunger with linear transmission
Dans tous les domaines où il faut doser des liquides, le système piston-seringue est largement utilisé et apprécié pour sa simplicité d'utilisation. Dans le domaine médical notamment, il est universellement répandu pour pratiquer des injections de médicaments. Il s'agit dans la majorité des cas d'injections manuelles de courte durée où il n'est pas nécessaire que la vitesse d'injection soit contrôlée de manière précise. Toutefois, il y a des cas de plus en plus fréquents où les médicaments ne doivent plus être injectés mais perfusés, c'est à dire administrés lentement dans le temps, et ceci de manière parfaitement mesurée. Pour cela il existe différents types de pompes dont le débit peut être programmé de manière précise. Une des solutions consiste à utiliser un "pousse-seringue", c'est à dire un système motorisé permettant de pousser linéairement le piston à une vitesse correspondant au débit désiré. La plupart de ces "pousse-seringue" sont des instruments de table de dimensions relativement importantes utilisés principalement en milieu hospitalier par du personnel spécialement fermé. On voit toutefois apparaître des modèles miniatures susceptibles d'être portés directement par le patient, ce qui permet de lui assurer une mobilité pratiquement complète et de multiplier par exemple les traitements à domicile. Si ce genre de traitements se multiplie, il devient de la plus haute importance que la mise en service du dispositif soit extrêmement fiable et simple, et puisse être maîtrisée par tout le personnel soignant après un minimum de formation.In all areas where liquids have to be dispensed, the plunger-syringe system is widely used and appreciated for its ease of use. In the medical field in particular, it is universally widespread for practicing drug injections. In the majority of cases, these are short-term manual injections where the injection speed does not have to be precisely controlled. However, there are more and more frequent cases where the drugs must no longer be injected but infused, that is to say administered slowly over time, and this in a perfectly measured manner. For this there are different types of pumps whose flow can be programmed precisely. One of the solutions consists in using a "syringe pump", that is to say a motorized system making it possible to linearly push the piston at a speed corresponding to the desired flow rate. Most of these "syringe pushers" are relatively large table instruments used mainly in hospitals by specially closed personnel. However, we see the appearance of miniature models capable of being worn directly by the patient, which allows him to ensure practically complete mobility and to multiply, for example, home treatments. If this kind of treatment multiplies, it becomes of the utmost importance that the commissioning of the device is extremely reliable and simple, and can be mastered by all the nursing staff after a minimum of training.
Un premier problème réside dans le système de remplissage de la seringue. Le fait d'utiliser des seringues préremplies limite les utilisations potentielles du système. Par ailleurs l'utilisation d'un système trop sophistiqué peut être pénalisant. On a donc intérêt à se rapprocher le plus possible du système de remplissage actuel qui est facile à assimiler, rapide et efficace.A first problem resides in the filling system of the syringe. Using pre-filled syringes limits potential uses of the system. Furthermore, the use of an overly sophisticated system can be penalizing. It is therefore beneficial to get as close as possible to the current filling system which is easy to assimilate, quick and efficient.
Un deuxième problème réside dans les moyens de transmission linéaire entre le système de motorisation et le piston. Dans les systèmes connus, ces moyens sont solidaires du système de motorisation et il est nécessaire de les remettre à 0 avant toute nouvelle utilisation, ce qui représente une manipulation supplémentaire relativement complexe. On pourrait également imaginer des moyens de type jetable prévus pour une seule utilisation. Il est alors important que les opérations de remplissage et de mise en service du dispositif restent très simple. C'est le but de la présente invention d'apporter une solution performante à ce problème. Elle concerne un piston de seringue pour la perfusion comportant un joint destiné à assurer l'étanchéité entre le corps de seringue et le piston, ce dernier étant caractérisé par le fait qu'il comporte un agrégat formé d'une pluralité de pièces mécaniques comprenant au moins des moyens de transmission linéaire agencés pour être entraînés par des moyens de commande et de motorisation extérieurs et un support de ces moyens de transmission, ledit piston comprenant également des moyens amovibles agencés de manière à pouvoir déplacer librement ledit agrégat à l'intérieur du corps de seringue avant la mise en service , et des moyens agencés de manière à fixer l'agrégat au moins indirectement au corps de seringue lors de la mise en service.A second problem lies in the means of linear transmission between the motorization system and the piston. In known systems, these means are integral with the motorization system and it is necessary to reset them to 0 before any new use, which represents a relatively complex additional manipulation. One could also imagine disposable type means provided for a single use. It is therefore important that the filling and commissioning operations of the device remain very simple. It is the aim of the present invention to provide an effective solution to this problem. It relates to a syringe plunger for infusion comprising a seal intended to seal between the syringe body and the plunger, the latter being characterized in that it comprises an aggregate formed by a plurality of mechanical parts comprising at less linear transmission means arranged to be driven by external control and motorization means and a support for these transmission means, said piston also comprising removable means arranged so as to be able to freely move said aggregate inside the body syringe before commissioning, and means arranged to fix the aggregate at least indirectly to the syringe body during commissioning.
Les figures la et lb représentent à titre d'exemple un piston de seringue selon l'invention en position poussée et en position tirée.Figures la and lb show by way of example a syringe plunger according to the invention in the pushed position and in the pulled position.
La figure 2 représente à titre d'exemple le piston avec son joint et l'agrégat mécanique avec son support, ses moyens de transmission linéaire et une tirette amovible pour effectuer les opérations de remplissage avant la mise en service. Les figures 3a et 3b représentent le piston fixé par au corps de seringue par une pièce de fixation intermédiaire en position de départ et en position complètement déployée. La figure 4 représente à titre d'exemple une tirette de remplissage à double action pour piston selon l'invention.FIG. 2 shows by way of example the piston with its seal and the mechanical unit with its support, its linear transmission means and a removable pull tab for carrying out the filling operations before putting into service. Figures 3a and 3b show the piston fixed by the syringe body by an intermediate fastener in the starting position and in the fully deployed position. FIG. 4 shows by way of example a double action filling puller for piston according to the invention.
La figure 5 représente à titre d'exemple des moyens de codage permettant de transmettre aux moyens de commande et de motorisation des informations concernant les caractéristiques du piston.FIG. 5 shows by way of example coding means making it possible to transmit to the control and motorization means information concerning the characteristics of the piston.
Les figures la et lb représentent un corps de seringue 1 pouvant être un corps de seringue standard tel qu'utilisé actuellement pour l'injection de médicaments ou autres substances liquides. Dans ce corps de seringue on trouve un piston comportant le joint 2 permettant d'assurer l'étanchéité entre le corps de seringue 1 et le piston. Ce joint 2 est monté sur un agrégat mécanique 3. Cet agrégat 3 comporte entre autres des moyens de transmission linéaire formé d'une combinaison de vis mère 4 et un support 5. Ce support 5 glisse librement dans le corps de seringue 1, si bien que la force de frottement entre le piston et le corps de seringue est donnée essentiellement par le frottement du joint 2 sur le corps de seringue 1. Une tirette amovible 6 permet de déplacer l'ensemble du piston. A la figure la, le piston est en position poussée ez le volume du réservoir formé entre le corps de seringue 1 et le joint 2 est pratiquement nul.Figures la and lb show a syringe body 1 which can be a standard syringe body as currently used for the injection of medicaments or other liquid substances. In this syringe body there is a piston comprising the seal 2 making it possible to seal between the syringe body 1 and the piston. This seal 2 is mounted on a mechanical aggregate 3. This aggregate 3 comprises, among other things, linear transmission means formed by a combination of mother screws 4 and a support 5. This support 5 slides freely in the syringe body 1, so much so that the friction force between the piston and the syringe body is given essentially by the friction of the seal 2 on the syringe body 1. A removable pull tab 6 makes it possible to move the entire piston. In Figure la, the piston is in the pushed position ez the volume of the reservoir formed between the syringe body 1 and the seal 2 is practically zero.
Sur la figure lb au contraire, le piston est en position tirée et le volume du réservoir formé entre le corps de seringue 1 et le joint 2 est maximum. On peut aisément imaginer qu'en agissant sur la tirette 6, on peut à volonté remplir et vider la seringue.In FIG. 1b, on the contrary, the piston is in the pulled position and the volume of the reservoir formed between the syringe body 1 and the seal 2 is maximum. One can easily imagine that by acting on the pull tab 6, one can at will fill and empty the syringe.
On peut donc procéder aux opérations de remplissage, élimination des bulles, mise en place avec si nécessaire remplissage d'un catétère, préinjection éventuelle, de la même manière qu'avec une seringue classique.It is therefore possible to carry out the filling operations, elimination of the bubbles, installation with if necessary filling of a cateter, possible pre-injection, in the same manner as with a conventional syringe.
Nous avons vu ci-dessus comment il était possible de remplir et de mettre en service la seringue. Nous allons voir maintenant comment il est possible de la vider de manière lente avec un débit parfaitement contrôlé.We have seen above how it was possible to fill and put the syringe into service. We will now see how it is possible to empty it slowly with a perfectly controlled flow.
Sur la figure 2, nous avons un exemple de piston selon l'invention sur lequel nous retrouvons le joint 20 et l'agrégat mécanique comprenant le support 21. Sur ce support 21 est fixé une vis mère 22 entraînée par une roue de transmission 23. Sur la vis rère 22 est montée un premier élément télescopique 24 sur lequel est monté un second élément télescopique 25. Le joint 20 est monté sur l'élément télescopique 25. Les éléments 22, 24 et 25 on le même pas et l'ensemble des éléments 22, 23, 24 et 25 forment les moyens de transmission linéaire. Lorsque on fait tourner la vis mère 22 reliée par la roue de transmission 23 aux moyens de motorisation adéquats, les éléments télescopiques 24 et 25 se déployent linéairement à une vitesse qui est directement proportionnelle à la vitesse de rotation de la vis mère 22. On arrive donc à contrôler avec précision cette vitesse de déplacement linéaire, et par là le débit, en contrôlant la vitesse de rotation des moyens de motorisation. Toutefois il faut éviter que le joint ne tourne, ce qui peut être le cas si la section du corps de seringue est circulaire. Pour éviter cela, on peut introduire un système de guidage formé par exemple d'une pièce intermédiaire 26 qui se déployé entre l'élément télescopique 25 qui porte le joint 20 et le support 21, et empêche ces deux pièces de tourner l'une par rapport à l'autre. Enfin le piston comporte une pièce métallique de forme annulaire 27 fixée sur le support 21. Cette pièce permet de fixer l'agrégat au corps de seringue comme nous le décrirons plus loin.In FIG. 2, we have an example of a piston according to the invention on which we find the seal 20 and the mechanical aggregate comprising the support 21. On this support 21 is fixed a lead screw 22 driven by a transmission wheel 23. On the rear screw 22 is mounted a first telescopic element 24 on which is mounted a second telescopic element 25. The seal 20 is mounted on the telescopic element 25. The elements 22, 24 and 25 have the same pitch and all of the elements 22, 23, 24 and 25 form the means of linear transmission. When the mother screw 22 connected by the transmission wheel 23 is rotated with the appropriate motor means, the telescopic elements 24 and 25 deploy linearly at a speed which is directly proportional to the speed of rotation of the mother screw 22. We arrive therefore to precisely control this linear displacement speed, and thereby the flow rate, by controlling the speed of rotation of the motorization means. However, the seal must not be rotated, which may be the case if the section of the syringe body is circular. To avoid this, one can introduce a guide system formed for example of an intermediate part 26 which is deployed between the telescopic element 25 which carries the seal 20 and the support 21, and prevents these two parts from rotating one by compared to each other. Finally, the piston comprises a metallic piece of annular shape 27 fixed on the support 21. This piece makes it possible to fix the aggregate to the syringe body as we will describe later.
Les figures 3a et 3b représentent la seringue et son piston avec leurs moyens de commande et de motorisation. Dans le cas représenté, il s'agit de moyens qui peuvent être montés directement sur la seringue et qui permettent de déplacer le piston avec précision par l'intermédiaire des moyens de transmission linéaire de l'agrégat mécanique du piston. Ces moyens de commande et de motorisation peuvent comprendre à titre d'exemple un moteur de type pas à pas 30 avec sa démultiplication 31 qui vient se coupler sur la roue de transmission de l'agrégat 32, une pile de type bouton 33 qui assure l'alimentation du système en énergie électrique et un circuit de commande électronique 34 comportant par exemple un microprocesseur qui régule la vitesse de rotation du moteur en fonction du débit désiré. Ces éléments sont représentés de manière très schématiques dans la mesure où il existe de très nombreuses combinaisons possible connues des gens de métier et que la partie commande-moteur ne fait pas directement partie de l'objet de l'invention.Figures 3a and 3b show the syringe and its piston with their control and motorization means. In the case shown, these are means which can be mounted directly on the syringe and which make it possible to move the piston precisely through the linear transmission means of the mechanical aggregate of the piston. These control and motorization means can comprise, for example, a stepping type motor 30 with its gear 31 which is coupled to the transmission wheel of the aggregate 32, a button type battery 33 which ensures the power supply to the system and an electronic control circuit 34 comprising for example a microprocessor which regulates the speed of rotation of the motor as a function of the desired flow rate. These elements are shown very schematically insofar as there are very many possible combinations known to those skilled in the art and that the engine-control part is not directly part of the subject of the invention.
Pour que le débit soit précis, il faut évidemment que, lors de la mise en service, l'agrégat soit fixé par rapport au corps de seringue, ce qui pourrait se faire avec des moyens de fixation intégrés directement dans le support de l'agrégat. Dans notre exemple cependant, l'agrégat est fixé par son support 35 à l'intérieur d'une pièce de fixation intermédiaire 36. Cette pièce comporte un aimant annulaire 37. Lorsque on place la pièce de fixation 36 sur le support 35, cet aimant 37 vient en regard de la pièce métallique annulaire 38 du support. Si cette pièce est par exemple en métal ferreux, la force magnétique de rétention entre l'aimant 37 et la pièce métallique 38 permet de fixer l'agrégat à la pièce de fixation intermédiaire 36.For the flow to be precise, it is obviously necessary that, during the putting into service, the aggregate is fixed relative to the syringe body, which could be done with fixing means integrated directly in the support of the aggregate . In our example, however, the aggregate is fixed by its support 35 inside an intermediate fixing piece 36. This piece has an annular magnet 37. When the fixing piece 36 is placed on the support 35, this magnet 37 comes opposite the annular metal part 38 of the support. If this part is for example made of ferrous metal, the magnetic force of retention enters the magnet 37 and the metal part 38 makes it possible to fix the aggregate to the intermediate fixing part 36.
A son tour, cette pièce intermédiaire 36 peut être fixée sur le corps de seringue par un système de baïonnette 39 comme cela se fait couramment lorsque l'on utilise des seringues avec de l'air comprimé. Ainsi on a fixé indirectement l'agrégat au corps de seringue par l'intermédiaire de la pièce de fixation 36. Notons que les moyens de commande et de motorisation sont également fixés sur cette pièce intermédiaire 36. Celle-ci peut donc servir d'adaptateur. On pourrait ainsi utiliser les mêmes moyens de commande et de motorisation avec des pistons et des corps de seringue de différentes dimensions et contenances, 10 ce , 20 ce, 50 ce, en utilisant des pièces intermédiaires 36 de configuration adaptée.In turn, this intermediate piece 36 can be attached to the syringe body by a bayonet system 39 as is commonly done when using syringes with compressed air. Thus, the aggregate was indirectly attached to the syringe body by means of the fixing part 36. It should be noted that the control and motorization means are also fixed to this intermediate part 36. The latter can therefore serve as an adapter . It would thus be possible to use the same control and motorization means with pistons and syringe bodies of different dimensions and capacities, 10 cc, 20 cc, 50 cc, using intermediate pieces 36 of suitable configuration.
La figure 3a représente la position de départ. Dans cette position les moyens de transmission linéaire formés de la vis mère et des deux éléments télescopiques sont entièrement repliés si bien que le réservoir formé entre le corps de seringue et le joint est maximum.Figure 3a shows the starting position. In this position, the linear transmission means formed by the lead screw and the two telescopic elements are completely folded back so that the reservoir formed between the syringe body and the seal is maximum.
La figure 3b représente la position finale. Dans cette position les moyens de transmission linéaire sont complètement déployés et le réservoir est quasiment vide. Lorsque la seringue est entièrement vidée, on peut récupérer les moyens de commande et de motorisation ainsi que la pièce intermédiaire, et les réutiliser sur une autre seringue. Par contre il est préférable de jeter l'ensemble piston seringue avec son agrégat mécanique. Le piston avec son agrégat seront donc réalisés de préférence avec des matières synthétiques de manière que le prix soit acceptable, à l'exception de la vis-mère elle-même qui pourrait être réalisée en métal pour des raisons que nous verrons plus loin.Figure 3b shows the final position. In this position the linear transmission means are fully deployed and the tank is almost empty. When the syringe is completely emptied, the control and motorization means as well as the intermediate piece can be recovered and reused on another syringe. On the other hand, it is preferable to discard the syringe piston assembly with its mechanical aggregate. The piston with its aggregate will therefore preferably be made with synthetic materials so that the price is acceptable, with the exception of the lead screw itself which could be made of metal for reasons that we will see later.
La figure 4 représente à titre d'exemple une tirette 40 permettant de déplacer le piston avant la mise en service. Il a été dit que cette tirette était amovible. A cette fin cette tirette 40 comporte une extrémité en forme de pince 41 qui peut être ouverte au moyen d'une tige 42 placée au centre de la tirette 40. Cette tige 42 comporte une extrémité conique 43. En pressant sur cette tige 42, l'extrémité conique 43 ouvre la pince 41 ce qui permet de dégager la tirette 40. Dans notre exemple, la pince 41 se branche directement sur la roue de transmission 44 qui entraîne la vis-mère, ces deux pièces étant de préférence métalliques de manière à offrir une résistance suffisante à la traction. Il est ainsi possible au moyen de la tirette 40 de déplacer linéairement l'ensemble du piston pour effectuer les opérations de remplissage de la seringue. Il est également possible avant remplissage de régler le contenu maximum de la seringue en tournant la tirette 40. Par cette opération on fait tourner la roue de transmission 44 ce qui a pour effet de déployer en partie le système de transmission linéaire, de modifier la position de départ du piston et de limiter ainsi le contenu de la seringue lors du remplissage.Figure 4 shows by way of example a pull tab 40 for moving the piston before commissioning. It has been said that this zipper is removable. To this end, this pull tab 40 has a clamp-shaped end 41 which can be opened by means of a rod 42 placed in the center of the pull rod 40. This rod 42 has a conical end 43. By pressing on this rod 42, the conical end 43 opens the clamp 41 which allows the puller 40 to be released. In our example, the clamp 41 is connected directly to the transmission wheel 44 which drives the lead screw, these two parts being preferably metallic so as to provide sufficient tensile strength. It is thus possible by means of the pull tab 40 to move the piston assembly linearly to carry out the filling operations of the syringe. It is also possible before filling to adjust the maximum content of the syringe by turning the pull tab 40. By this operation, the transmission wheel is rotated 44 which has the effect of partially deploying the linear transmission system, of modifying the position of the piston and thus limit the content of the syringe during filling.
Ainsi par exemple, si on ne veut remplir la seringue qu'au deux tiers de sa capacité totale, il suffit d'effectuer manuellement avec la tirette un tiers du nombre de tours nécessaire pour vider complètement la seringue. Le système de transmission linéaire sera alors déployé sur un tiers de sa longueur totale, ce qui limite le remplissage possible en proportion. Pour plus de clarté, cette situation est représentée à la figure 3a. Après l'opération de prédéployement du système de transmission linéaire, le joint viendra dans la position représentée en pointillé lors du remplissage et de la mise en service, ce qui limite le contenu du réservoir dans la proportion recherchée. Il est ainsi possible par exemple de régler le remplissage et, par exemple, de ne perfuser que 35 ce dans une seringue de 50 ce.So, for example, if you only want to fill the syringe to two thirds of its total capacity, it suffices to manually perform with the zipper a third of the number of turns necessary to completely empty the syringe. The linear transmission system will then be deployed over a third of its total length, which limits the possible filling in proportion. For clarity, this situation is shown in Figure 3a. After the pre-deployment operation of the linear transmission system, the seal will come into the position shown in dotted lines during filling and putting into service, which limits the content of the tank in the desired proportion. It is thus possible for example to adjust the filling and, for example, to infuse only 35 cc in a 50 cc syringe.
La figure 5 représente à titre d'exemple des moyens de codage du type de seringue utilisé. Nous avons dit plus haut que les mêmes moyens de commande et de motorisation pouvaient être montés sur des seringues de contenances différentes en utilisant des pièces intermédiaires adaptées. Si c'est le cas, une même vitesse de rotation de ces moyens de motorisation vont produire des débits différents selon le type de seringue utilisé. Or le débit est l'un des paramètres les plus importants lors d'un traitement par perfusion. Une solution utile pour éviter les erreurs et faciliter la programmation des moyens de commande consiste à introduire un moyen de codage du système piston/seringue utilisé qui puisse être lu par lesdits moyens de commande.FIG. 5 shows, by way of example, means for coding the type of syringe used. We said above that the same control and motorization means could be mounted on syringes of different capacities using suitable intermediate parts. If this is the case, the same speed of rotation of these motorization means will produce different flow rates depending on the type of syringe used. One of the most important parameters during infusion therapy is flow. A useful solution to avoid errors and facilitate the programming of the control means consists in introducing a means of coding the plunger / syringe system used which can be read by said control means.
Dans le cas représenté à la figure 5, ce codage s'effectue au moyen de deux tétons 50 et 51 montés sur la pièce intermédiaire 52 . Ces deux tétons collaborent avec deux contacts 53 et 54 des moyens de commande et de motorisation. Selon la longueur des tétons, les contacts correspondants sont ouverts ou fermés . Dans la configuration représentée le contact 53 est fermé et le contact 54 ouvert, ce qui corrspond par exemple à une seringue de 10 ce. Les deux contacts forment une combinaison binaire de 2 bits pouvant être lue par le circuit de commande, et permettant à celui- ci de différencier 4 types différents de systèmes piston/seringues. Pour augmenter le nombre de possibilités, il suffit d'augmenter le nombre de contacts. La représentation de la figure 5 est schématique, car il existe de très nombreuses possibilités connues des gens de métier pour effectuer ce genre de codage, avec contacts, sans contacts, et il n'est pas nécessaire d'entrer dans tous les détails.In the case shown in FIG. 5, this coding is carried out by means of two pins 50 and 51 mounted on the intermediate part 52. These two pins collaborate with two contacts 53 and 54 of the control and motorization means. Depending on the length of the nipples, the corresponding contacts are open or closed. In the configuration shown the contact 53 is closed and the contact 54 open, which corresponds for example to a 10 cc syringe. The two contacts form a 2-bit binary combination that can be read by the control circuit, and which allows the latter to differentiate 4 different types of plunger / syringe systems. To increase the number of possibilities, simply increase the number of contacts. The representation of Figure 5 is schematic, because there are very numerous possibilities known to those skilled in the art for carrying out this kind of coding, with contacts, without contacts, and it is not necessary to go into all the details.
Notons que l'on pourrait également intégrer ces moyens de codage dans le support de l'agrégat avec une liaison directe entre cet agrégat et les moyens de commande et de motorisation. Note that one could also integrate these coding means in the support of the aggregate with a direct link between this aggregate and the control and motorization means.

Claims

RevendicationsClaims
/ Piston de seringue pour la perfusion comportant un joint destiné à assurer l'étanchéité entre le corps de seringue et le piston, ce dernier étant caractérisé par le fait qu'il comporte un agrégat formé d'une pluralité de pièces mécaniques comprenant au moins des moyens de transmission linéaire agencés pour être entraînés par des moyens de commande et de motorisation extérieurs et un support de ces moyens de transmission, ledit piston comprenant également des moyens amovibles agencés de manière à pouvoir déplacer librement ledit agrégat à l'intérieur du corps de seringue avant la mise en service , et des moyens agencés de manière à fixer l'agrégat au moins indirectement au corps de seringue lors de la mise en service./ Syringe plunger for infusion comprising a seal intended to seal between the syringe body and the plunger, the latter being characterized in that it comprises an aggregate formed by a plurality of mechanical parts comprising at least linear transmission means arranged to be driven by external control and motorization means and a support for these transmission means, said piston also comprising removable means arranged so as to be able to freely move said aggregate inside the syringe body before putting into service, and means arranged so as to fix the aggregate at least indirectly to the syringe body during putting into service.
/ Piston de seringue selon la revendication 1 caractérisé par le fait que les moyens de transmission linéaire comportent une vis mère et au moins un élément télescopique sur lequel est monté le joint destiné à assurer l'étanchéité entre le corps de seringue et le piston. / Piston de seringue selon les revendications 1 et 2 caractérisé par le fait que l'agrégat comporte un système de guidage agencé de manière à empêcher la rotation entre ledit support et ledit élément télescopique sur lequel est monté le joint./ Syringe plunger according to claim 1 characterized in that the linear transmission means comprise a lead screw and at least one telescopic element on which is mounted the seal intended to ensure the seal between the syringe body and the piston. / Syringe plunger according to claims 1 and 2 characterized in that the aggregate comprises a guide system arranged so as to prevent rotation between said support and said telescopic element on which the seal is mounted.
/ Piston de seringue selon la revendication 1, caractérisé par le fait que les moyens pour fixer l'agrégat au corps de seringue comprennent une pièce intermédiaire comportant des moyens de fixation du support dudit agrégat./ Syringe plunger according to claim 1, characterized in that the means for fixing the aggregate to the syringe body comprise an intermediate piece comprising means for fixing the support of said aggregate.
/ Piston de seringue selon les revendications 1 et 4 caractérisé par le fait que lesdits moyens de fixation du support sur la pièce intermédiaire comportent au moins un aimant venant en regard d'une pièce en matériau magnétique./ Syringe plunger according to claims 1 and 4 characterized in that said means for fixing the support on the intermediate piece comprise at least one magnet coming opposite a piece of magnetic material.
/ Piston de seringue selon les revendications 1 et 4 caractérisé par le fait que ladite pièce intermédiaire comporte un système de baïonnette agencé de manière à fixer cette pièce intermédiaire sur le corps de seringue. / Piston de seringue selon la revendication 1 caractérisé par le fait que les moyens amovibles pour déplacer ledit agrégat à l'intérieur du corps de seringue comportent une extrémité en forme de pince agencée de manière à être fixée sur les moyens de transmission linéaire de 'façon à permettre à la fois le déplacement linéaire dudit agrégat et ia rotation des moyens de transmission linéaire./ Syringe plunger according to claims 1 and 4 characterized in that said intermediate piece comprises a bayonet system arranged so as to fix this intermediate piece on the syringe body. / Syringe plunger according to claim 1 characterized in that the removable means for moving said aggregate inside the syringe body have a clamp-like end arranged so as to be fixed on the linear transmission means so to allow both the linear displacement of said aggregate and the rotation of the linear transmission means.
/ Piston de seringue selon la revendication 1 caractérisé par le fait qu'il comporte des moyens de codage disposés de manière a agir sur les moyens de commande et de motorisation de façon à adapter ceux-ci au type de piston/seringue utilisé. / Syringe plunger according to claim 1 characterized in that it comprises coding means arranged so as to act on the control and motorization means so as to adapt these to the type of plunger / syringe used.
EP96919518A 1995-06-14 1996-06-11 Linear-transmission syringe plunger Withdrawn EP0851774A1 (en)

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CH175195 1995-06-14
CH175195 1995-06-14
PCT/CH1996/000221 WO1997000091A1 (en) 1995-06-14 1996-06-11 Linear-transmission syringe plunger

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