FR2585252A1 - Syringe pusher - Google Patents

Syringe pusher Download PDF

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Publication number
FR2585252A1
FR2585252A1 FR8511522A FR8511522A FR2585252A1 FR 2585252 A1 FR2585252 A1 FR 2585252A1 FR 8511522 A FR8511522 A FR 8511522A FR 8511522 A FR8511522 A FR 8511522A FR 2585252 A1 FR2585252 A1 FR 2585252A1
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FR
France
Prior art keywords
pusher
nut
syringe
screw
syringe pump
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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.)
Granted
Application number
FR8511522A
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French (fr)
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FR2585252B1 (en
Inventor
Georges Gazuit
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GAZUIT STE NLE ELECTRONIQUE
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GAZUIT STE NLE ELECTRONIQUE
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Publication date
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Priority to FR8511522A priority Critical patent/FR2585252B1/en
Publication of FR2585252A1 publication Critical patent/FR2585252A1/en
Application granted granted Critical
Publication of FR2585252B1 publication Critical patent/FR2585252B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • A61M5/14—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
    • A61M5/1456—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 comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir

Abstract

Syringe pusher comprising a thruster 6 mounted so as to slide on a guide rod 4, an endless ballscrew 7, driven by a motor 11 rotating in both directions which interacts with a non-disengageable nut 13 fixed on the thruster 6, such that the return to the starting point of this thruster occurs by acting on an electrical control lever for reversing the direction of rotation of the electric motor and not by manually disengaging the nut interacting with the screw.

Description

La présente invention concerne un pousse-seringue à commande entièrement él ectronique, du type comprenant un poussoir guidé sur une tige montée parallèlement à une vis entrainée par un moteur apte à pousser le piston d'une seringue fixée sur le corps du pousse-seringue par l'intérmédiaire d'un écrou non débrayable associé à la vis, le retour en arrière du piston au point de départ s'effectuant par rotation inverse de la vis entrainant ainsi l'écrou sur le poussoir en arrière. The present invention relates to a syringe driver with fully electronic control, of the type comprising a push rod guided on a rod mounted parallel to a screw driven by a motor capable of pushing the plunger of a syringe fixed on the body of the syringe driver by the intermediary of a non-disengageable nut associated with the screw, the return back of the piston to the starting point being effected by reverse rotation of the screw thus causing the nut on the pusher back.

Un pousse-seringue est un appareil utilisé dans les centres hospitaliers pour délivrer de façon régulière une quantité soigneusement dosée d'un liquide contenu dans une seringue et injecté à un malade pendant un temps plus ou moins long. A syringe pump is a device used in hospitals to regularly deliver a carefully dosed quantity of a liquid contained in a syringe and injected into a patient for a more or less long time.

Les pousse-seringues disponibles dans le commerce peuvent être classés en deux groupes 1) les appareils entièrement mécaniques dans lesquels le moteur électrique d'entrainement est relié à la vis sans fin par l'intermédiaire d'un ensemble mécanique de réduction et de contrôle de vitesse. Ces appareils sont en voie de disparition. Commercially available syringe pumps can be classified into two groups 1) fully mechanical devices in which the electric drive motor is connected to the worm screw via a mechanical reduction and control assembly speed. These devices are on the way out.

2) les appareils électroniques dans lesquels un ensemble électronique est prévu pour réguler la vitesse du moteur d'entrainement de la vis sans fin.2) electronic devices in which an electronic assembly is provided to regulate the speed of the worm drive motor.

Etant donné sa fonction, le pousse-seringue doit répondre essentiellement à deux impératifs qui sont, d'une part, la régularité du dosage du liquide à injecter, donc la régularité du dispositif d'entrainement, et, d'autre part, la fiabilité de l'appareil. Given its function, the syringe pump must essentially meet two imperatives which are, on the one hand, the regularity of the dosage of the liquid to be injected, therefore the regularity of the drive device, and, on the other hand, the reliability of the device.

Les appareils du type élecrronique actuellement disponibles sur le marché offrent d'une façon générale une bonne régularité du dosage, grâce à l'ensemble électronique de pilotage qui assure la régulation de la vitesse du moteur pas à pas qui entraine la vis sans fin. Par contre, la fiabilité de ces appareils repose essentiellement sur la qualité de la transmission mécanique de la poussée sur le piston de la seringue. Or, dans les appareils antérieurement connus, une usure plus ou moins rapide de la vis sans fin et/ou de l'écrou débrayable ou un système mécanique mal adapté de remise au point de départ du poussoir provoquent un manque de régularité dans le débit de la seringue. Cette usure est généralement due à une mauvaise répartition de la pression de contact entre l'écrou débrayable et la vis sans fin.Cette mauvaise répartition de la pression de contact est elle-même due à plusieurs causes. Une première cause est que la vis sans fin, en plus de sa fonction d'entrainement du poussoir, assure aussi le guidage de ce dernier en combinaison avec l'unique tige de guidage. Comme la force de poussée est appliquée par le poussoir au piston de la seringue en un point excentré par rapport à la vis sans fin, la force de réaction qui est appliquée par le piston au poussoir exerce sur ce dernier un couple qui a tendance à faire travailler l'écrou débrayable en biais par rapport à la vis sans fin, provoquant ainsi une usure de ces deux éléments. Une autre cause de la mauvaise répartition de la pression de contact entre écrou et la vis sans fin réside dans la structure même de l'ensemble vis-écrou utilisé dans les appareils antérieurement connus.C'est ainsi que dans les appareils utilisant une vis excentrée par rapport à l'écrou, le contact entre vis et écrou est limité à la valeur angulaire de la zone de contact. The electronic type devices currently available on the market generally offer good dosing regularity, thanks to the electronic control unit which regulates the speed of the stepping motor which drives the worm. On the other hand, the reliability of these devices is essentially based on the quality of the mechanical transmission of the thrust on the plunger of the syringe. However, in the previously known devices, more or less rapid wear of the worm and / or the disengageable nut or a poorly adapted mechanical system for returning to the starting point of the pusher cause a lack of regularity in the flow of the syringe. This wear is generally due to a poor distribution of the contact pressure between the disengageable nut and the worm. This poor distribution of the contact pressure is itself due to several causes. A first cause is that the worm, in addition to its function of driving the pusher, also ensures the guiding of the latter in combination with the single guide rod. As the pushing force is applied by the plunger to the plunger of the syringe at an eccentric point relative to the worm, the reaction force which is applied by the plunger to the plunger exerts on the latter a torque which tends to make work the disengageable nut at an angle to the worm, thus causing wear of these two elements. Another cause of the poor distribution of the contact pressure between nut and the worm screw lies in the very structure of the screw-nut assembly used in previously known devices. This is how in devices using an eccentric screw relative to the nut, the contact between screw and nut is limited to the angular value of the contact area.

De même, dans les appareils utilisant un écrou fendu à serrage conique, le contact entre vis et écrou est fonction du serrage conique de l'écrou.Similarly, in devices using a split nut with conical tightening, the contact between screw and nut is a function of the conical tightening of the nut.

En outre, dans les appareils antérieurement connus, il y a un rique de frottement entre l'écrou et la vis lorsque le poussoir est ramené à son point de départ.In addition, in previously known devices, there is a risk of friction between the nut and the screw when the pusher is returned to its starting point.

La présente invention a donc pour but de supprimer toute usure de la vis et de l'écrou et, par suite, d'améliorer considérablement la fiabilité du pousse-seringue. The present invention therefore aims to eliminate any wear of the screw and the nut and, as a result, considerably improve the reliability of the syringe pump.

A cet effet, le pousse-seringue selon la présente invention est caractérisé sur ce qu'il comprend une tige de guidage du poussoir supportant la totalité des effets de flexion, la vis de manoeuvre indépendante de la tige de guidage ne supportant ainsi qu'une seule sollicitation de traction et entrainant un écrou d'une seule pièce entourant complètement la vis et non débrayable par rapport à celle-ci.  To this end, the syringe pump according to the present invention is characterized in that it comprises a guide rod for the pusher supporting all of the bending effects, the maneuvering screw independent of the guide rod thus only supporting one only tensile stress and causing a single piece nut completely surrounding the screw and not disengageable relative to the latter.

Une telle construction entraine une position de retour au point de départ du piston entièrement électrique par rotation inverse de la vis et du moteur entrainant la vis. Such a construction causes a position of return to the starting point of the fully electric piston by reverse rotation of the screw and of the motor driving the screw.

Avec un tel arrangement, le guidage du poussoir n'est plus assuré en partie par la vis elle-même mais uniquement par la tige de guidage. With such an arrangement, the guide of the pusher is no longer provided in part by the screw itself but only by the guide rod.

Ainsi le guidage du poussoir est indépendant de la vis de sorte que l'usure de cette dernière est diminuée et la précision du dosage et de la régularité du débit de la seringue sont conservés dans le temps. Par ailleurs l'usure de l'écrou est également diminuée du fait qu'il enveloppe entièrement la vis ce qui diminue la pression de contact et qu'étant non débrayable, il n'y a aucun risque de frottement vis écrou pendant l'opération de retour au point de départ. Le non débrayage de l'écrou améliore considérablement la sécutité de fonctionnement en rendant impossible le risque d'un débrayage intempestif en cours de fonctionnement, le pilotage entièrement électronique du moteur pas à pas est assorti de systèmes d'alarmes et de sécurité, décrits plus après qui rendent l'appareil particulièrement opérationnel dans le milieu hospitalier.Thus the guide of the plunger is independent of the screw so that the wear of the latter is reduced and the precision of the metering and the regularity of the flow rate of the syringe are preserved over time. Furthermore, the wear of the nut is also reduced due to the fact that it completely envelops the screw which reduces the contact pressure and that being non-disengageable, there is no risk of friction between the nut and the screw during the operation. back to the starting point. The non-disengagement of the nut considerably improves operating safety by making it impossible to risk an inadvertent disengagement during operation, the fully electronic control of the stepping motor is accompanied by alarm and safety systems, described more after which make the device particularly operational in the hospital environment.

On décrira maintenant à titre d'exemple purement indicatif et nullement limitatif une forme d'exécution de la présente invention en faisant référence au dessin annexé sur lequel,
la figure I est une vue en perspective du pousse-seringue selon l'invention après enlèvement du carter.An embodiment of the present invention will now be described by way of purely indicative and in no way limiting example, with reference to the appended drawing in which,
Figure I is a perspective view of the syringe pump according to the invention after removal of the housing.

la figure Il est une vue en coupe du pousse-seringue montrant la disposition générale des éléments y compris la carFe électronique dans le pousse-seringue. Figure It is a sectional view of the syringe pump showing the general arrangement of the elements including the electronic carFe in the syringe pump.

Le pousse-seringue représenté au dessin comprend un socle (1) en tôle d'acier ou aluminium sur lequel sont fixés les divers organes constituant le pousse-seringue. Ce socle (1) est recouvert par un capotage démontable en acier ou en ABS 15. L'ensemble mécanique est constitué d'une plaque (2) fixée sur le socle (1) par 4 silentblocs. Sur, cette plaque (2) sont fixés 2 supports verticaux (3), une tige de guidage (4) fixée sur les 2 montants (3) parallèlement au socle (1) supporte un poussoir (6) coulissant sur la tige (4) par l'intermédiaire d'une douille à billes (5) afin de
diminuer les frottements et par suite les risques d'usure et la force
nécessaire au glissement, la longueur de la douille à billes est telle
qu'elle puisse assurer un guidage parfait malgré la pression exercée sur
la plaque de poussée (12) fixé amovible sur le poussoir (6).The syringe pump shown in the drawing comprises a base (1) made of sheet steel or aluminum on which the various members constituting the syringe pump are fixed. This base (1) is covered by a removable cover made of steel or ABS 15. The mechanical assembly consists of a plate (2) fixed to the base (1) by 4 silentblocs. On this plate (2) are fixed 2 vertical supports (3), a guide rod (4) fixed on the 2 uprights (3) parallel to the base (1) supports a pusher (6) sliding on the rod (4) by means of a ball bushing (5) in order to
reduce friction and consequently the risks of wear and force
necessary for sliding, the length of the ball bushing is such
that it can ensure perfect guidance despite the pressure exerted on
the push plate (12) removably attached to the pusher (6).

Le poussoir (6) peut être déplacé le long de la tige (4) au moyen
d'une vis sans fin (7) qui peut être une vis à billes montée entre les 2
supports verticaux (3) et d'un écrou non débrayable (13) fixë sur le poussoir
(6), la vis sans fin (7) est entrainée en rotation dans les 2 sens par un
moteur électrique pas à pas (11) commandé par un dispositif électronique
connu avec roue codeuse (8). La liaison entre l'arbre du moteur électrique et la vis sans fin (7) est assuré par un montage mécanique (9) avec un
accouplement (14) assurant le contrôle du couple moteur et permettant ainsi de limiter à une valeur prédéterminée la force appliquée sur la plaque de poussée (12).The pusher (6) can be moved along the rod (4) by means
an endless screw (7) which can be a ball screw mounted between the 2
vertical supports (3) and a non-disengageable nut (13) fixed on the pusher
(6), the worm (7) is rotated in both directions by a
electric stepping motor (11) controlled by an electronic device
known with coding wheel (8). The connection between the shaft of the electric motor and the worm (7) is ensured by a mechanical assembly (9) with a
coupling (14) ensuring the control of the engine torque and thus making it possible to limit the force applied to the thrust plate (12) to a predetermined value.

Le retour en position départ du poussoir (6) s'opère non pas par débrayage de la vis sans fin (7) mais par rotation inverse du moteur pas à pas à une vitesse rapide par rapport à 1' avancement.  The return to the start position of the pusher (6) takes place not by disengaging the worm (7) but by reverse rotation of the stepping motor at a rapid speed with respect to advancement.

Le pilotage est assuré par une carte électronique (16) à microprocesseur commandée par une carte d'affichage (17) permettant de sélec -tionner par clavier le débit de la seringue la durée du temps d'injection et le type de la seringue. La carte électronique permet en outre d'assurer le contrôle du fonctionnement électrique, fausse manoeuvre, présence seringue, fin d'injection avec alarme visuelle et sonore. L'alimentation électrique est assurée par une prise arrière (20) avec ou sans batterie tempon (18). Piloting is ensured by an electronic card (16) with microprocessor controlled by a display card (17) making it possible to select by keyboard the flow rate of the syringe, the duration of the injection time and the type of syringe. The electronic card also makes it possible to ensure the control of the electrical operation, wrong operation, syringe presence, end of injection with visual and audible alarm. The power supply is provided by a rear socket (20) with or without tempon battery (18).

Il va de soi que la forme d'exécution de la présente invention qui a été décrite ci-dessus a été donnée à titre d'exemple purement indicatif
et nullement limitatif et que de nombreuses modifications peuvent être
facilement apportées par l'homme de l'art sans pour autant sortir du
cadre de la présente invention. It goes without saying that the embodiment of the present invention which has been described above has been given by way of purely indicative example.
and in no way limitative and that many modifications can be
easily made by those skilled in the art without leaving the
part of the present invention.

Claims (3)

REVENDICATIONS coopère avec un écrou non débrayable (13) porté par le poussoir (6) pour faire avancer ou reculer au point de départ le poussoir (6). cooperates with a non-disengageable nut (13) carried by the pusher (6) to move the pusher (6) forward or backward. moteur (li) qui s'étend parallèlement à la tige de guidage (4) et qui motor (li) which extends parallel to the guide rod (4) and which vis sans fin ou à billes (7) entrainée dans les 2 sens de rotation par un worm or ball screw (7) driven in both directions of rotation by a le piston d'une seringue et monté coulissant sur une tige de guidage (4), une the plunger of a syringe and slidably mounted on a guide rod (4), a I - Pousse-seringue comprenant un poussoir (6) apte à pousser I - Syringe pump comprising a plunger (6) capable of pushing 2 - Pousse-seringue selon la revendication 1 caractérisé en ce 2 - Syringe pump according to claim 1 characterized in that que la tige de guidage (4) prend la totalité des efforts de flexion due à that the guide rod (4) takes all of the bending forces due to la réaction de la force F exercée sur la plaque de poussée (12). the reaction of the force F exerted on the thrust plate (12). 3 - Pousse-seringue selon la revendication 1 caractérisé en ce que 3 - Syringe pump according to claim 1 characterized in that l'écrou (13) du poussoir (6) n'étant pas débrayable le retour au point de the nut (13) of the pusher (6) not being disengageable the return to the point of départ de ce poussoir se fait sans manipulation sur le poussoir lui-même departure of this pusher is done without manipulation on the pusher itself mais par simple action sur un contact électrique à levier fixé sur le but by simple action on an electrical lever contact fixed on the tableau de commande du pousse-seringue.  syringe pump control panel.
FR8511522A 1985-07-26 1985-07-26 SYRINGE DRIVER Expired - Fee Related FR2585252B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8511522A FR2585252B1 (en) 1985-07-26 1985-07-26 SYRINGE DRIVER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8511522A FR2585252B1 (en) 1985-07-26 1985-07-26 SYRINGE DRIVER

Publications (2)

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FR2585252A1 true FR2585252A1 (en) 1987-01-30
FR2585252B1 FR2585252B1 (en) 1990-06-15

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FR8511522A Expired - Fee Related FR2585252B1 (en) 1985-07-26 1985-07-26 SYRINGE DRIVER

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