EP0712465B1 - Peristaltic pump housing - Google Patents

Peristaltic pump housing Download PDF

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Publication number
EP0712465B1
EP0712465B1 EP94923774A EP94923774A EP0712465B1 EP 0712465 B1 EP0712465 B1 EP 0712465B1 EP 94923774 A EP94923774 A EP 94923774A EP 94923774 A EP94923774 A EP 94923774A EP 0712465 B1 EP0712465 B1 EP 0712465B1
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EP
European Patent Office
Prior art keywords
rollers
tube
cassette
drive spindle
cassette according
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.)
Expired - Lifetime
Application number
EP94923774A
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German (de)
French (fr)
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EP0712465A1 (en
Inventor
Frédéric Neftel
Bernard Bouvier
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.)
Debiotech SA
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Debiotech SA
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Publication date
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Publication of EP0712465A1 publication Critical patent/EP0712465A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
    • F04B43/1276—Means for pushing the rollers against the tubular flexible member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action

Definitions

  • the present invention relates to a peristaltic pump cassette making the final occlusion of its tube during the first introduction of the motor axis.
  • Peristaltic pumps allow obtaining a regular and controllable flow. They are commonly used, in particular in the medical field, for example for controlling injections.
  • Peristaltic pumps often include a cassette intended to cooperate with the axis of a motor which produces the friction drive of the mobile elements.
  • Such a cassette includes a housing, a deformable tube and rotating rollers.
  • the deformable tube forms a loop in a plane, applied to a bearing surface of the housing by rotary rollers.
  • a cassette released from its engine block, is capable of allowing the flow of a liquid in the tube which passes through it, which can in certain cases present risks.
  • an infusion liquid can then be injected under uncontrolled conditions, no longer corresponding to the prescription.
  • the object of the present invention is therefore to propose a peristaltic pump cassette in which the tube is permanently obliterated after first use, regardless of its subsequent configuration and its location in relation to the engine block.
  • the deformable tube being applied to the bearing surface and deformed by the rotating rollers, so as to produce the entrainment of a liquid which it contains.
  • the rollers before the first use, have a radial position in which the tube is not closed; during the first use, they are radially displaced by an introduction of the drive axis, closing the tube; after use, the rollers are held in a radial position ensuring the obturation of the tube.
  • the cassette 1 is placed, during its use, on the engine block 2 which has a housing provided for this purpose.
  • buttons 6 and 7 allow the dissociation of the cassette 1 from the engine block 2 and contribute to the safety necessary for this operation.
  • the tubes 8 and 9 are respectively the inlet and outlet tubes of the pump.
  • the tube 8 can, for example, be connected to an infusion reservoir, while the tube 9 is connected to an injection needle.
  • the deformable tube 11 forms an approximately planar loop, supported by its outer surface on a bearing surface 12 provided for this purpose in the housing 13 of the cassette 1 of the peristaltic pump.
  • rollers 14, of variable number, represented here three in number, have a shape of axis revolution 21 and are placed inside the loop formed by the deformable tube 11.
  • the drive axis 15 parallel to the axis of revolution of the rollers, spreads them when it is introduced between them, causes them to compress the deformable tube 11 against the bearing surface 12 and ensures their drive by friction.
  • rollers are all identical and their description is made more particularly with reference to Figure 6.
  • a roller has an axis of revolution 21, two cylindrical surfaces 22, 23 in contact with the axis 30 and allowing the rollers 14 to be driven by this axis 30.
  • a bearing surface 24 of axis 21, preferably in the shape of a barrel, that is to say with a convexity facing outward, is intended to ensure compression on the deformable tube 11.
  • the central element 25 results from the method of manufacturing the roller 14 and does not intervene directly in the device and the operation described here.
  • the roller 14 is provided, at each of its ends, with a cylinder 26, 27, also of axis 21, of diameter smaller than the cylinders 22 and 23.
  • the axis 21 of the rollers is of course parallel to the drive axis 30.
  • the radial distance of the rollers is distance r, respectively designated by rl, r2, r3 in the various Figures.
  • the peristaltic pump cassette has a housing 40 formed of a base 41 and a cover.
  • the deformable tube 11 When the pump is mounted, the deformable tube 11 is connected to a tube guide 42, on which it is fixed by means of the male elements 43 and 44.
  • the deformable tube 11 thus forms an approximately planar loop which is positioned inside the housing 40 and bears on the bearing surface 12.
  • rollers 14 are then introduced inside the closed loop. Due to their diameter, they come into contact with each other and produce a slight deformation of the tube 11. By elasticity, the tube 11 pushes the rollers towards the center and produces their contact with each other.
  • the tube 11 In the absence of the drive axis, the tube 11, as shown in section in Figure 4, is only partially deformed. Indeed, the respective dimensions of the housing and the rollers are determined in such a way that this tube 11 is not closed or obliterated.
  • This compression causes the complete obstruction or obliteration of the tubing.
  • this compression exerts an elastic force applying the rollers 14, more particularly their cylindrical zones 22, 23 on the drive axis 30.
  • the pipe 11 Since the pipe 11 is no longer obliterated, it is capable of allowing the liquid it contains to circulate, for example when a pressure difference exists between the inlet pipe 8 and the outlet pipe 9.
  • the housing 40 of the cassette comprises an elastic element, not shown, cooperating with the axis of rotation 30, so that the latter, once introduced in position in the cassette , can no longer be checked out. It may be, for example, an elastic finger fixed to the bottom of the housing and cooperating with a groove formed on the drive axis 30.
  • the elastic tube 11 is permanently obliterated by the introduction of the axis of rotation 30 which is itself final.
  • the drive axis 30 must be changed each time the cassette is changed.
  • the housing 40 is equipped with a disk 50, positioned relative to the latter by notches 51, 52, and comprising an elastic finger 53, possibly equipped with a stop 54, capable of cooperate with the cylinder 27 of the rollers 14.
  • a flange 55 provided on the disc 50 contributes to its positioning relative to the housing 40.
  • the stop 54 is concentric with the drive axis 30.
  • rollers 14 are pushed, as indicated above, towards the outside of the cassette and allow the engagement of the stop 54 at the cylindrical part 27 roller 14, as shown in Figure 6.
  • the stop 54 has a dimension such that it is kept at a distance, without contact with the cylinder 27, during the presence of the drive axis 30.
  • the cassette of the invention has only one disc placed in the vicinity of one of the bases of the rollers 14.
  • the angular dimension of the stop 54 is determined in such a way that, whatever the position of the rollers inside the cassette, at least one of them is supported on this stop and ensures, with the best security, obliteration of the tube 11. This result is obtained with an angular stop 54 extending over an angle of at least 120 ° and preferably equal to approximately 132 °.
  • the rollers are positioned at a distance r1 from the drive axis 30.
  • their radial position becomes r2 and when the latter is removed, the radial position of the rollers 14 becomes r3.
  • r2 is greater than r1 and the displacement of the rollers in this position produces complete obliteration of the deformable tube 11.
  • r3 is also greater than r1 and when the rollers 14 occupy the corresponding position, complete obliteration of the tube 11 is also carried out.
  • r3 is slightly less than r2.
  • rollers have hubs 60 and are held by separators 61.
  • the separator 61 then comprises, for each of the rollers 14, a first housing 62 corresponding to a first radial position r5 of the rollers, and a second housing 63 corresponding to a second radial position r6 of the rollers.
  • first housings 62 and second housings 63 are separated by stops 64, 65 forming between them a space of dimension smaller than the diameter of the hub 60. These first and second housings thus form an end element of each arm 66 of the deformable separator 61 when pressure is exerted by the hub 60. This deformation allows the hub 60 to pass from the first housing 62 to the second housing 63.
  • the radial distance r6 of the second housing 63 is greater than the radial distance r5 of the first housing 62.
  • the hubs 60 and rollers 14 are placed in the first housings.
  • the drive axis 30 designates the drive axis of the rollers as a material element, but also as defining its theoretical position, including when the pump is dissociated from its engine block, therefore that the axis is not physically present.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • External Artificial Organs (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

A peristaltic pump housing (1) interacting in use with a drive unit (22) via a drive shaft (30) including a casing (40) with a tube-engaging surface (12), a compressible tube (11) and rotary rollers (14) friction driven by the drive shaft (30). The compressible tube (11) is arranged on the tube-engaging surface (12) and compressed by the rotary rollers (14) to convey the fluid contained therein. Before being used for the first time, the rollers (14) are in a radial position in which the tube (11) is not closed off. When they are first used, the rollers are shifted radially by inserting the drive shaft (30), whereby the tube is closed off. After use, the rollers (14) are held in a radial position in which the tube is closed off.

Description

La présente invention concerne une cassette de pompe péristaltique réalisant l'occlusion définitive de son tube lors de la première introduction de l'axe moteur.The present invention relates to a peristaltic pump cassette making the final occlusion of its tube during the first introduction of the motor axis.

Les pompes péristaltiques permettent l'obtention d'un débit régulier et contrôlable. Elles sont couramment utilisées, en particulier dans le domaine médical, par exemple pour contrôler des injections.Peristaltic pumps allow obtaining a regular and controllable flow. They are commonly used, in particular in the medical field, for example for controlling injections.

Les pompes péristaltiques comportent souvent une cassette destinée à coopérer avec l'axe d'un moteur qui produit l'entraînement par friction des éléments mobiles.Peristaltic pumps often include a cassette intended to cooperate with the axis of a motor which produces the friction drive of the mobile elements.

Une telle cassette comporte un boîtier, un tube déformable et des galets rotatifs.Such a cassette includes a housing, a deformable tube and rotating rollers.

Le tube déformable forme une boucle dans un plan, appliquée sur une surface d'appui du boîtier par des galets rotatifs.The deformable tube forms a loop in a plane, applied to a bearing surface of the housing by rotary rollers.

L'entraînement en rotation de ces galets rotatifs par l'axe du moteur produit la déformation du tube qui engendre l'effet péristaltique recherché.The rotary drive of these rotary rollers by the axis of the motor produces the deformation of the tube which generates the desired peristaltic effect.

Les pompes et cassettes de pompes péristaltiques ont fait l'objet de nombreuses publications. On citera par exemple :

  • La demande de brevet français FR-A-2.595.765 qui décrit et illustre une pompe péristaltique comprenant au moins deux tubes élastiques disposés en parallèle et une pluralité de galets presseurs agissant sur ces tubes élastiques. Cette pompe a pour objet de fournir un débit régulier.
  • La demande de brevet français FR-A-2.644.212 a pour objet une cassette pour pompe péristaltique à tube déformable et la pompe munie d'une telle cassette. La cassette présente un boîtier qui comporte, au voisinage de chacune de ses extrémités, un chemin de roulement cylindrique contre lequel s'appliquent et roulent des satellites qui écrasent le tube déformable situé entre les deux chemins de roulement. La cassette décrite et illustrée est d'une construction simple et robuste.
  • La demande de brevet français FR-A-2.644.522 concerne une pompe péristaltique à tube déformable comportant, à l'intérieur du carter, des arcs de tube déformable indépendants, ce qui assure une réduction des fluctuations du débit instantanée. La pompe a un faible encombrement.
Peristaltic pumps and cassettes have been the subject of numerous publications. We will quote for example:
  • French patent application FR-A-2,595,765 which describes and illustrates a peristaltic pump comprising at least two elastic tubes arranged in parallel and a plurality of pressure rollers acting on these elastic tubes. The purpose of this pump is to provide a regular flow.
  • French patent application FR-A-2,644,212 relates to a cassette for a peristaltic pump with a deformable tube and the pump provided with such a cassette. The cassette has a casing which comprises, in the vicinity of each of its ends, a cylindrical raceway against which are applied and roll satellites which crush the deformable tube located between the two raceways. The cassette described and illustrated is of a simple and robust construction.
  • French patent application FR-A-2,644,522 relates to a peristaltic pump with a deformable tube comprising, inside the casing, independent deformable tube arcs, which ensures a reduction in the fluctuations of the instantaneous flow rate. The pump has a small footprint.

L'utilisation des pompes péristaltiques à cassette en milieu hospitalier permet l'amélioration de la sécurité des soins. En ce sens, les cassettes jetables, dissociables du groupe moteur, ont constitué une amélioration significative.The use of peristaltic cassette pumps in hospitals improves the safety of care. In this sense, the disposable cassettes, which can be separated from the motor unit, were a significant improvement.

La mise en oeuvre de dispositif de détrompage évitant qu'une cassette puisse être utilisée avec un bloc moteur auquel elle n'est pas destinée, a également constitué une étape importante dans l'amélioration de la fiabilité.The implementation of a keying device preventing a cassette from being able to be used with an engine block for which it is not intended, also constituted an important step in improving reliability.

Il est toutefois apparu qu'une cassette, libérée de son bloc moteur, est susceptible de permettre l'écoulement d'un liquide dans le tube qui la traverse, ce qui peut dans certains cas présenter des risques.However, it appeared that a cassette, released from its engine block, is capable of allowing the flow of a liquid in the tube which passes through it, which can in certain cases present risks.

Par exemple, un liquide de perfusion peut alors être injecté dans des conditions non contrôlées, ne correspondant plus à la prescription.For example, an infusion liquid can then be injected under uncontrolled conditions, no longer corresponding to the prescription.

Pour résoudre cette difficulté, il a été envisagé de mettre en oeuvre des cassettes de pompe péristaltique, dans lesquelles le tube déformable est mis en compression et oblitéré dès le montage de la pompe. Toutefois, il s'est avéré que cette mise en compression du tube, en un point déterminé, pendant toute la période de temps s'écoulant entre le montage et l'utilisation de la pompe, est susceptible d'entraîner une déformation permanente du tube préjudiciable à son utilisation ultérieure.To resolve this difficulty, it has been envisaged to use peristaltic pump cassettes, in which the deformable tube is placed in compression and obliterated as soon as the pump is assembled. However, it has been found that this compression of the tube, at a determined point, throughout the period of time elapsing between assembly and use of the pump, is liable to cause permanent deformation of the tube prejudicial to its subsequent use.

Le but de la présente invention est donc de proposer une cassette de pompe péristaltique dans laquelle le tube est oblitéré, en permanence, après le premier usage, quelles que soient sa configuration ultérieure et sa situation par rapport au bloc moteur.The object of the present invention is therefore to propose a peristaltic pump cassette in which the tube is permanently obliterated after first use, regardless of its subsequent configuration and its location in relation to the engine block.

C'est un autre objectif de l'invention de proposer une telle cassette à auto-occlusion qui puisse être stockée, avant son premier usage, sans que cela n'entraîne une détérioration du tube.It is another objective of the invention to provide such a self-occluding cassette which can be stored, before its first use, without this causing damage to the tube.

C'est encore un autre objectif de la présente invention de proposer une cassette de pompe péristaltique à auto-occlusion relativement simple à fabriquer et dont le coût de fabrication peut rester raisonnable.It is yet another objective of the present invention to provide a self-occluding peristaltic pump cassette which is relatively simple to manufacture and the manufacturing cost of which can remain reasonable.

Ainsi, l'invention concerne une cassette de pompe péristaltique destinée à coopérer, lors de son utilisation, avec un bloc moteur par un axe d'entraînement comprenant :

  • un boîtier ayant une surface d'appui de tube,
  • un tube déformable,
  • des galets rotatifs entraînables par friction par l'axe d'entraînement,
Thus, the invention relates to a peristaltic pump cassette intended to cooperate, during its use, with an engine block by a drive shaft comprising:
  • a housing having a tube bearing surface,
  • a deformable tube,
  • rotating rollers which can be frictionally driven by the drive shaft,

le tube déformable étant appliqué sur la surface d'appui et déformé par les galets rotatifs, de façon à produire l'entraînement d'un liquide qu'il contient.the deformable tube being applied to the bearing surface and deformed by the rotating rollers, so as to produce the entrainment of a liquid which it contains.

Selon l'invention, avant la première utilisation, les galets ont une position radiale dans laquelle le tube n'est pas obturé ; lors de la première utilisation, ils sont radialement déplacés par une introduction de l'axe d'entraînement, obturant le tube ; après l'utilisation, les galets sont maintenus dans une position radiale assurant l'obturation du tube.According to the invention, before the first use, the rollers have a radial position in which the tube is not closed; during the first use, they are radially displaced by an introduction of the drive axis, closing the tube; after use, the rollers are held in a radial position ensuring the obturation of the tube.

Selon différents modes de réalisation présentant chacun leurs avantages spécifiques, les caractéristiques ci-après, considérées isolément ou selon toutes leurs combinaisons techniquement possibles, sont prévues :

  • le boîtier contient des moyens de blocage empêchant l'enlèvement d'une partie au moins de l'axe d'entraînement après sa première introduction ;
  • la cassette comporte un organe élastique lié au boîtier, libéré par l'introduction de l'axe d'entraînement et maintenant au moins l'un des galets dans une position radiale assurant l'obturation du tube ;
  • les galets sont libres et ont chacun une surface de révolution d'entraînement délimitée par deux bases, et comportent chacun au moins un cylindre sur l'une de leurs bases ; le boîtier comporte un disque, approximativement perpendiculaire à l'axe d'entraînement, au voisinage des galets, ce disque ayant un doigt élastique mis en appui sur la base du cylindre de l'un des galets avant la première introduction de l'axe d'entraînement, libéré lors de l'introduction de cet axe, et venant en appui contre la surface de révolution du cylindre, maintenant au moins un galet dans une position radiale assurant l'obturation du tube ;
  • le disque est un disque en matière plastique dans lequel le doigt élastique est formé ;
  • le doigt élastique porte une butée concentrique de l'axe d'entraînement apte à coopérer avec le cylindre des galets ;
  • la butée couvre un angle supérieur à 120° ;
  • la butée couvre un angle d'environ 132° ;
  • lorsque l'axe d'entraînement est introduit dans la cassette, le doigt élastique n'est pas en contact avec les galets ;
  • les galets ont des moyeux, et la cassette comporte des séparateurs sur lesquels les galets sont fixés par leurs moyeux, lesdits séparateurs comportant des premiers logements dans lesquels sont placés les moyeux avant la première introduction de l'axe d'entraînement, et des seconds logements plus excentrés que les premiers, et séparés de ceux-ci par une butée élastique, la première introduction de l'axe du moteur dans la cassette produisant le déplacement irréversible des moyeux des premiers logements vers les seconds.
According to different embodiments, each presenting their specific advantages, the following characteristics, considered in isolation or in all their technically possible combinations, are provided:
  • the housing contains blocking means preventing the removal of at least part of the drive shaft after its first introduction;
  • the cassette comprises an elastic member linked to the housing, released by the introduction of the drive axis and maintaining at least one of the rollers in a radial position ensuring the obturation of the tube;
  • the rollers are free and each have a drive revolution surface delimited by two bases, and each comprise at least one cylinder on one of their bases; the housing comprises a disc, approximately perpendicular to the drive axis, in the vicinity of the rollers, this disc having an elastic finger supported on the base of the cylinder of one of the rollers before the first introduction of the axis d 'drive, released during the introduction of this axis, and coming to bear against the surface of revolution of the cylinder, maintaining at least one roller in a radial position ensuring the obturation of the tube;
  • the disc is a plastic disc in which the elastic finger is formed;
  • the elastic finger carries a concentric stop of the drive shaft capable of cooperating with the roller cylinder;
  • the stopper covers an angle greater than 120 °;
  • the stopper covers an angle of approximately 132 °;
  • when the drive shaft is introduced into the cassette, the elastic finger is not in contact with the rollers;
  • the rollers have hubs, and the cassette comprises separators on which the rollers are fixed by their hubs, said separators comprising first housings in which the hubs are placed before the first introduction of the drive axis, and second housings more eccentric than the first, and separated from them by an elastic stop, the first introduction of the motor shaft into the cassette producing irreversible displacement of the hubs from the first housings to the second.

L'invention sera décrite en détail en référence aux dessins annexés dans lesquels :

  • la Figure 1 est une représentation générale d'une cassette de pompe péristaltique en position d'utilisation sur un bloc moteur, vu en perspective ;
  • la Figure 2 est la représentation du même ensemble vu de dessus ;
  • la Figure 3 est une représentation vue de dessus d'une cassette selon l'invention sans son capot avant toute utilisation ;
  • la Figure 4 est la représentation en coupe AA de la cassette de la Figure 3 ;
  • les Figures 5 et 6 sont les représentations correspondantes aux Figures 3 et 4, lorsque la cassette coopère avec l'axe d'entraînement ;
  • les Figures 7 et 8 correspondent aux Figures 3 et 4, lorsque la cassette a été dissociée de l'axe d'entraînement après utilisation ;
  • la Figure 9 représente la mise en oeuvre de l'invention dans une cassette comportant des séparateurs avant la première utilisation ;
  • la Figure 10 représente le même ensemble en présence de l'axe d'entraînement ou après utilisation.
The invention will be described in detail with reference to the accompanying drawings in which:
  • Figure 1 is a general representation of a peristaltic pump cassette in the position of use on an engine block, seen in perspective;
  • Figure 2 is the representation of the same assembly seen from above;
  • Figure 3 is a top view representation of a cassette according to the invention without its cover before any use;
  • Figure 4 is the sectional representation AA of the cassette of Figure 3;
  • Figures 5 and 6 are the representations corresponding to Figures 3 and 4, when the cassette cooperates with the drive axis;
  • Figures 7 and 8 correspond to Figures 3 and 4, when the cassette has been separated from the drive shaft after use;
  • Figure 9 shows the implementation of the invention in a cassette comprising separators before the first use;
  • Figure 10 shows the same set in the presence of the drive shaft or after use.

La cassette 1 est placée, lors de son utilisation, sur le bloc moteur 2 qui présente un logement prévu à cet effet.The cassette 1 is placed, during its use, on the engine block 2 which has a housing provided for this purpose.

Par les commandes 3 et 4 et le panneau de visualisation 5, le fonctionnement du bloc moteur 2 est contrôlé par l'utilisateur.By commands 3 and 4 and the display panel 5, the operation of the engine block 2 is controlled by the user.

Les boutons 6 et 7 permettent la dissociation de la cassette 1 du bloc moteur 2 et concourent à la sécurité nécessaire à cette opération.The buttons 6 and 7 allow the dissociation of the cassette 1 from the engine block 2 and contribute to the safety necessary for this operation.

Les tubes 8 et 9 sont respectivement les tubes d'entrée et de sortie de la pompe. Le tube 8 peut, par exemple, être relié à un réservoir de perfusion, alors que le tube 9 est relié à une aiguille d'injection.The tubes 8 and 9 are respectively the inlet and outlet tubes of the pump. The tube 8 can, for example, be connected to an infusion reservoir, while the tube 9 is connected to an injection needle.

Le tube déformable 11 forme une boucle approximativement plane, en appui par sa surface extérieure sur une surface d'appui 12 prévue à cet effet dans le boîtier 13 de la cassette 1 de la pompe péristaltique.The deformable tube 11 forms an approximately planar loop, supported by its outer surface on a bearing surface 12 provided for this purpose in the housing 13 of the cassette 1 of the peristaltic pump.

Les galets 14, en nombre variable, représentés ici au nombre de trois, ont une forme de révolution d'axe 21 et sont placés à l'intérieur de la boucle formée par le tube déformable 11.The rollers 14, of variable number, represented here three in number, have a shape of axis revolution 21 and are placed inside the loop formed by the deformable tube 11.

L'axe d'entraînement 15, parallèle à l'axe de révolution des galets, écarte ceux-ci lorsqu'il est introduit entre eux, les amène à comprimer le tube déformable 11 contre la surface d'appui 12 et assure leur entraînement par friction.The drive axis 15, parallel to the axis of revolution of the rollers, spreads them when it is introduced between them, causes them to compress the deformable tube 11 against the bearing surface 12 and ensures their drive by friction.

Les galets sont tous identiques et leur description est faite plus particulièrement en référence à la Figure 6.The rollers are all identical and their description is made more particularly with reference to Figure 6.

Un galet a un axe de révolution 21, deux surfaces cylindriques 22, 23 en contact avec l'axe 30 et permettant l'entraînement des galets 14 par cet axe 30.A roller has an axis of revolution 21, two cylindrical surfaces 22, 23 in contact with the axis 30 and allowing the rollers 14 to be driven by this axis 30.

Une surface d'appui 24 d'axe 21, de préférence en forme de tonneau, c'est-à-dire avec une convexité tournée vers l'extérieur, est destinée à assurer une compression sur le tube déformable 11. L'élément central 25 résulte du procédé de fabrication du galet 14 et n'intervient pas directement dans le dispositif et le fonctionnement décrits ici.A bearing surface 24 of axis 21, preferably in the shape of a barrel, that is to say with a convexity facing outward, is intended to ensure compression on the deformable tube 11. The central element 25 results from the method of manufacturing the roller 14 and does not intervene directly in the device and the operation described here.

Le galet 14 est muni, à chacune de ses extrémités, d'un cylindre 26, 27, également d'axe 21, de diamètre inférieur aux cylindres 22 et 23.The roller 14 is provided, at each of its ends, with a cylinder 26, 27, also of axis 21, of diameter smaller than the cylinders 22 and 23.

L'axe 21 des galets est bien entendu parallèle à l'axe 30 d'entraînement. La distance radiale des galets est la distance r, respectivement désignée par rl, r2, r3 sur les différentes Figures.The axis 21 of the rollers is of course parallel to the drive axis 30. The radial distance of the rollers is distance r, respectively designated by rl, r2, r3 in the various Figures.

La cassette de pompe péristaltique comporte un boîtier 40 formé d'une base 41 et d'un couvercle.The peristaltic pump cassette has a housing 40 formed of a base 41 and a cover.

Dans un but de clarté, le couvercle n'a pas été représenté. Il est généralement encliqueté sur la base 41 et participe au maintien des éléments contenus par la cassette 40.For clarity, the cover has not been shown. It is generally snapped onto the base 41 and helps maintain the elements contained by the cassette 40.

Lors du montage de la pompe, le tube déformable 11 est relié à un guide-tube 42, sur lequel il est fixé par l'intermédiaire des éléments mâles 43 et 44.When the pump is mounted, the deformable tube 11 is connected to a tube guide 42, on which it is fixed by means of the male elements 43 and 44.

Le tube déformable 11 forme ainsi une boucle, approximativement plane, qui est positionnée à l'intérieur du boîtier 40 et vient en appui sur la surface d'appui 12.The deformable tube 11 thus forms an approximately planar loop which is positioned inside the housing 40 and bears on the bearing surface 12.

Les galets 14 sont alors introduits à l'intérieur de la boucle fermée. En raison de leur diamètre, ils viennent en contact les uns avec les autres et produisent une légère déformation du tube 11. Par élasticité, la tubulure 11 repousse les galets vers le centre et produit leur contact les uns avec les autres.The rollers 14 are then introduced inside the closed loop. Due to their diameter, they come into contact with each other and produce a slight deformation of the tube 11. By elasticity, the tube 11 pushes the rollers towards the center and produces their contact with each other.

En l'absence de l'axe d'entraînement, le tube 11, telle que représentée en coupe sur la Figure 4, n'est que partiellement déformée. En effet, les dimensions respectives du boîtier et des galets sont déterminées de telle manière que ce tube 11 ne soit pas obturé ou oblitéré.In the absence of the drive axis, the tube 11, as shown in section in Figure 4, is only partially deformed. Indeed, the respective dimensions of the housing and the rollers are determined in such a way that this tube 11 is not closed or obliterated.

La faible déformation de la tubulure déformable 11, dans cet état, n'est en rien préjudiciable à son utilisation ultérieure, quelle que soit la durée de stockage pendant laquelle elle est maintenue en cet état. Par contre, puisqu'elle n'est que faiblement déformée, elle n'est pas oblitérée et pourrait laisser passer, passivement, un fluide mis sous pression à l'une de ses extrémités.The slight deformation of the deformable tube 11, in this state, is in no way detrimental to its subsequent use, whatever the storage period during which it is kept in this state. On the other hand, since it is only slightly deformed, it is not obliterated and could pass passively, a fluid pressurized at one of its ends.

L'introduction de l'axe d'entraînement 30, telle que représentée sur les Figures 5 et 6, produit un écartement des galets par rapport au centre et entraîne la compression de la tubulure 11 entre la surface d'appui 12 du boîtier et la surface d'appui 24 des galets.The introduction of the drive axis 30, as shown in Figures 5 and 6, produces a spacing of the rollers relative to the center and causes the compression of the tube 11 between the bearing surface 12 of the housing and the bearing surface 24 of the rollers.

Cette mise en compression entraîne l'obturation ou oblitération complète de la tubulure.This compression causes the complete obstruction or obliteration of the tubing.

Par ailleurs, cette compression exerce une force élastique appliquant les galets 14, plus particulièrement leurs zones cylindriques 22, 23 sur l'axe d'entraînement 30.Furthermore, this compression exerts an elastic force applying the rollers 14, more particularly their cylindrical zones 22, 23 on the drive axis 30.

Ainsi, lors de la rotation de cet axe d'entraînement 30, les galets 14 sont entraînés en rotation par friction.Thus, during the rotation of this drive axis 30, the rollers 14 are rotated by friction.

Ils tournent sur eux-mêmes et leur axe de rotation tourne lui-même autour de l'axe d'entraînement 30.They rotate on themselves and their axis of rotation rotates itself around the drive axis 30.

On comprend que lors de l'utilisation des cassettes connues, la dissociation de la cassette de l'axe d'entraînement 30 ramène les différents éléments constitutifs de la cassette en leur état initial, représenté aux Figures 3 et 4, par l'effet de l'élasticité de la canalisation 11 qui reprend sa forme initiale et ramène les galets en contact les uns avec les autres.It is understood that during the use of known cassettes, the dissociation of the cassette from the drive axis 30 brings the various constituent elements of the cassette back to their initial state, represented in FIGS. 3 and 4, by the effect of the elasticity of the pipe 11 which returns to its initial shape and brings the rollers in contact with each other.

La canalisation 11 n'étant plus alors oblitérée, elle est susceptible de laisser circuler le liquide qu'elle contient, par exemple lorsqu'une différence de pression existe entre la canalisation d'entrée 8 et la canalisation de sortie 9.Since the pipe 11 is no longer obliterated, it is capable of allowing the liquid it contains to circulate, for example when a pressure difference exists between the inlet pipe 8 and the outlet pipe 9.

Dans un premier mode de réalisation de l'invention, le boîtier 40 de la cassette comporte un élément élastique, non représenté, coopérant avec l'axe de rotation 30, de telle sorte que celui-ci, une fois introduit en position dans la cassette, ne puisse plus être extrait. Il peut s'agir, par exemple, d'un doigt élastique fixé au fond du boîtier et coopérant avec une gorge ménagée sur l'axe d'entraînement 30.In a first embodiment of the invention, the housing 40 of the cassette comprises an elastic element, not shown, cooperating with the axis of rotation 30, so that the latter, once introduced in position in the cassette , can no longer be checked out. It may be, for example, an elastic finger fixed to the bottom of the housing and cooperating with a groove formed on the drive axis 30.

Ainsi, le tube élastique 11 est définitivement oblitéré par l'introduction de l'axe de rotation 30 qui est elle-même définitive.Thus, the elastic tube 11 is permanently obliterated by the introduction of the axis of rotation 30 which is itself final.

Dans ce cas, l'axe d'entraînement 30 doit être changé à chaque fois que l'on change de cassette. L'axe moteur 32, solidaire du bloc moteur 2, comporte alors un organe d'accouplement 31 assurant la jonction avec l'axe d'entraînement 30.In this case, the drive axis 30 must be changed each time the cassette is changed. The motor axis 32, integral with the engine block 2, then comprises a coupling member 31 ensuring the junction with the drive axis 30.

Dans un deuxième mode de réalisation préféré, le boîtier 40 est équipé d'un disque 50, positionné par rapport à celui-ci par des encoches 51, 52, et comportant un doigt élastique 53, éventuellement équipé d'une butée 54, apte à coopérer avec le cylindre 27 des galets 14.In a second preferred embodiment, the housing 40 is equipped with a disk 50, positioned relative to the latter by notches 51, 52, and comprising an elastic finger 53, possibly equipped with a stop 54, capable of cooperate with the cylinder 27 of the rollers 14.

Une collerette 55 prévue sur le disque 50 concourt à son positionnement par rapport au boîtier 40.A flange 55 provided on the disc 50 contributes to its positioning relative to the housing 40.

La butée 54 est concentrique de l'axe d'entraînement 30.The stop 54 is concentric with the drive axis 30.

Sa position radiale, définie par sa distance r4 à l'axe 30, est telle que, lorsque les galets 14 sont en position de montage, position dans laquelle la tubulure 11 telle qu'indiquée plus haut est faiblement déformée, cette butée cylindrique est en appui sur l'une des bases d'au moins l'un des galets 14. Ainsi, ces galets 14 sont libres et sont positionnés uniquement par l'effet de la force de rappel élastique produite par la tubulure 11 et par leur encombrement respectif.Its radial position, defined by its distance r4 from the axis 30, is such that, when the rollers 14 are in the mounting position, position in which the tube 11 as indicated above is slightly deformed, this cylindrical stop is in support on one of the bases of at least one of the rollers 14. Thus, these rollers 14 are free and are positioned only by the effect of the elastic restoring force produced by the tube 11 and by their respective size.

Lors de l'introduction de l'axe d'entraînement 30, les galets 14 sont repoussés, tel qu'indiqué plus haut, vers l'extérieur de la cassette et autorisent l'engagement de la butée 54 au niveau de la partie cylindrique 27 du galet 14, tel que représenté sur la Figure 6.During the introduction of the drive axis 30, the rollers 14 are pushed, as indicated above, towards the outside of the cassette and allow the engagement of the stop 54 at the cylindrical part 27 roller 14, as shown in Figure 6.

Ainsi, lors du retrait de l'axe d'entraînement 30, tel que représenté sur les Figures 7 et 8, le galet 14, tendant à reprendre sa position de montage initial par l'effet de la force élastique exercée par le tube déformable 11, en est empêché par la butée 54. Ainsi, l'obturation ou oblitération du tube 11 est maintenue, même en l'absence de l'axe d'entraînement 30.Thus, during the withdrawal of the drive axis 30, as shown in Figures 7 and 8, the roller 14, tending to return to its initial mounting position by the effect of the elastic force exerted by the deformable tube 11 , in is prevented by the stop 54. Thus, the obturation or obliteration of the tube 11 is maintained, even in the absence of the drive axis 30.

Afin d'éviter une perturbation éventuelle du mouvement des galets 14 lors de l'utilisation de la pompé, la butée 54 a une dimension telle qu'elle est maintenue à distance, sans contact avec le cylindre 27, lors de la présence de l'axe d'entraînement 30.In order to avoid a possible disturbance of the movement of the rollers 14 during the use of the pumped, the stop 54 has a dimension such that it is kept at a distance, without contact with the cylinder 27, during the presence of the drive axis 30.

Telle que décrite jusqu'à présent et représentée sur les Figures 3 à 8, la cassette de l'invention ne comporte qu'un seul disque placé au voisinage de l'une des bases des galets 14.As described so far and shown in Figures 3 to 8, the cassette of the invention has only one disc placed in the vicinity of one of the bases of the rollers 14.

Toutefois, il est possible de prévoir un tel disque sur chacune des bases, au-dessus et en dessous des galets.However, it is possible to provide such a disc on each of the bases, above and below the rollers.

La dimension angulaire de la butée 54 est déterminée de telle manière que, quelle que soit la position des galets à l'intérieur de la cassette, l'un au moins d'entre eux soit en appui sur cette butée et assure, avec la meilleure sécurité, l'oblitération du tube 11. Ce résultat est obtenu avec une butée angulaire 54 s'étendant sur un angle d'au moins 120° et, de préférence, égal à 132° environ.The angular dimension of the stop 54 is determined in such a way that, whatever the position of the rollers inside the cassette, at least one of them is supported on this stop and ensures, with the best security, obliteration of the tube 11. This result is obtained with an angular stop 54 extending over an angle of at least 120 ° and preferably equal to approximately 132 °.

Lors du montage, les galets se positionnent à une distance r1 de l'axe d'entraînement 30. Lorsque l'axe d'entraînement 30 est introduit, leur position radiale devient r2 et lorsque celui-ci est enlevé, la position radiale des galets 14 devient r3. r2 est supérieur à r1 et le déplacement des galets en cette position produit l'oblitération complète du tube déformable 11. r3 est également supérieur à r1 et lorsque les galets 14 occupent la position correspondante, l'oblitération complète du tube 11 est également réalisée. Toutefois, afin de limiter les forces de frottement produites par le disque 50 lors du fonctionnement de la cassette, r3 est légèrement inférieure à r2.During assembly, the rollers are positioned at a distance r1 from the drive axis 30. When the drive axis 30 is introduced, their radial position becomes r2 and when the latter is removed, the radial position of the rollers 14 becomes r3. r2 is greater than r1 and the displacement of the rollers in this position produces complete obliteration of the deformable tube 11. r3 is also greater than r1 and when the rollers 14 occupy the corresponding position, complete obliteration of the tube 11 is also carried out. However, in order to limit the friction forces produced by the disc 50 during the operation of the cassette, r3 is slightly less than r2.

Un autre mode de réalisation de l'invention est proposé dans le cas où les galets comportent des moyeux 60 et sont maintenus par des séparateurs 61.Another embodiment of the invention is proposed in the case where the rollers have hubs 60 and are held by separators 61.

Ce mode de réalisation est schématiquement représenté sur les Figures 9 et 10. Seuls les séparateurs et les galets sont représentés, les autres éléments de la cassette étant analogues à ceux décrits plus haut.This embodiment is schematically shown in Figures 9 and 10. Only the separators and the rollers are shown, the other elements of the cassette being similar to those described above.

Le séparateur 61 comprend alors, pour chacun des galets 14, un premier logement 62 correspondant à une première position radiale r5 des galets, et un deuxième logement 63 correspondant à une deuxième position radiale r6 des galets.The separator 61 then comprises, for each of the rollers 14, a first housing 62 corresponding to a first radial position r5 of the rollers, and a second housing 63 corresponding to a second radial position r6 of the rollers.

Ces premiers logements 62 et deuxièmes logements 63 sont séparés par des butées 64, 65 ménageant entre elles un espace de dimension inférieure au diamètre du moyeu 60. Ces premier et deuxième logements forment ainsi un élément d'extrémité de chaque bras 66 du séparateur 61 déformable lorsqu'une pression est exercée par le moyeu 60. Cette déformation permet le passage du moyeu 60 du premier logement 62 au deuxième logement 63.These first housings 62 and second housings 63 are separated by stops 64, 65 forming between them a space of dimension smaller than the diameter of the hub 60. These first and second housings thus form an end element of each arm 66 of the deformable separator 61 when pressure is exerted by the hub 60. This deformation allows the hub 60 to pass from the first housing 62 to the second housing 63.

La distance radiale r6 du deuxième logement 63 est supérieure à la distance radiale r5 du premier logement 62.The radial distance r6 of the second housing 63 is greater than the radial distance r5 of the first housing 62.

Lors du montage de la cassette, les moyeux 60 et galets 14 sont placés dans les premiers logements.When mounting the cassette, the hubs 60 and rollers 14 are placed in the first housings.

Lors de l'introduction de l'axe d'entraînement 30 entre les galets, celui-ci exerce une force de pression sur les moyeux 60, imposant leur passage par déformation élastique de l'extrémité des bras 66 vers les deuxième logements 63.When the drive pin 30 is introduced between the rollers, the latter exerts a pressure force on the hubs 60, imposing their passage by elastic deformation from the end of the arms 66 towards the second housings 63.

Lors de l'extraction de l'axe d'entraînement 30, la force élastique de rappel exercée par la tubulure déformable 11 est insuffisante pour produire le rappel des moyeux dans les premiers logements 62.During the extraction of the drive axis 30, the elastic return force exerted by the deformable tube 11 is insufficient to produce the return of the hubs in the first housings 62.

Ainsi, ceux-ci restent maintenus dans les deuxième logements 63 et maintiennent l'oblitération du tube 11.Thus, these remain maintained in the second housings 63 and maintain the obliteration of the tube 11.

Dans cette description, on a désigné par axe d'entraînement 30, l'axe d'entraînement des galets en tant qu'élément matériel, mais aussi comme définissant sa position théorique, y compris lorsque la pompe est dissociée de son bloc moteur, donc que l'axe n'est pas matériellement présent.In this description, the drive axis 30 designates the drive axis of the rollers as a material element, but also as defining its theoretical position, including when the pump is dissociated from its engine block, therefore that the axis is not physically present.

Les signes de référence insérés après les caractéristiques techniques mentionnées dans les revendications, ont pour seul but de faciliter la compréhension de ces dernières, et n'en limitent aucunement la portée.The reference signs inserted after the technical characteristics mentioned in the claims, have the sole purpose of facilitating the understanding of the latter, and in no way limit their scope.

Claims (9)

  1. Peristaltic pump cassette (1) designed to cooperate with a motor unit (22) through a drive spindle (30) when in use, comprising :
    - a casing (40) with a tube bearing surface (12),
    - a deformable tube (11),
    - rotating rollers (14) driven by friction by the driving spindle (30),
       the deformable tube (11) being applied to the bearing surface (12) and deformed by the rotating rollers (14), in order to produce driving of a liquid contained therein.
       characterized by means which effect that :
    before the first use, the radial position of the rollers (14) is such that the tube (11) is not closed,
    during the first use, they are radially moved as the drive spindle (30) is inserted, thus closing the tube,
    after use, the rollers (14) are kept in a radial position closing the tube.
  2. Cassette according to claim 1, wherein the casing (40) contains blocking means preventing removal of at least part of the drive spindle (30), after its first insertion.
  3. Cassette according to claim 1, wherein it includes an elastic device linked to the casing (40), released by insertion of the drive spindle (30) and holding at least one of the rollers (14) in a radial position blocking the tube (11).
  4. Cassette according to claim 3, characterized in that the rollers (14) are free, each having a drive surface of revolution (24) delimited by at least one base and each being fitted with at least one cylinder at one of its bases, and in that the casing comprises a disk (50) approximately perpendicular to the drive spindle (30) close to the rollers (14), the said disk being fitted with an elastic pin bearing on the cylinder (27) of one of the rollers before the first insertion of the drive spindle, released when the drive spindle is inserted and bearing on the surface of revolution of the cylinder (27), holding at least one roller in a radial position that closes the tube.
  5. Cassette according to claim 4, characterized in that the disk (50) is made of plastic in which the elastic pin (53) is formed.
  6. Cassette according to any one of claims 4 and 5, characterized in that the elastic pin (53) supports an abutment (54) concentric to the drive spindle, and capable of working in conjunction with the cylinder (27) of the rollers (14).
  7. Cassette according to claim 6, characterized in that this abutment (54) covers an angle exceeding 120°.
  8. Cassette according to any one of claims 4 to 7, characterized in that when the drive spindle (30) is inserted in the cassette, the elastic pin (53) is not in contact with the rollers (14).
  9. Cassette according to claim 3, characterized in that the rollers (14) have hubs (60), and in that the cassette contains separators (66) on which the rollers are fixed by their hubs (60), the said separators containing first housings (62) in which the hubs (60) are positioned before the fist insertion of the drive spindle (30), and second housings (63) more eccentric than the first housings and separated from them by an elastic abutment (64, 65), the first insertion of the drive spindle (30) into the cassette producing the irreversible displacement of the hubs from the first housings (62) into the second housings (63).
EP94923774A 1993-08-06 1994-08-03 Peristaltic pump housing Expired - Lifetime EP0712465B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9309749 1993-08-06
FR9309749A FR2708675B1 (en) 1993-08-06 1993-08-06 Peristaltic pump cassette.
PCT/FR1994/000976 WO1995004886A1 (en) 1993-08-06 1994-08-03 Peristaltic pump housing

Publications (2)

Publication Number Publication Date
EP0712465A1 EP0712465A1 (en) 1996-05-22
EP0712465B1 true EP0712465B1 (en) 1997-04-02

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EP94923774A Expired - Lifetime EP0712465B1 (en) 1993-08-06 1994-08-03 Peristaltic pump housing

Country Status (8)

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US (1) US5655897A (en)
EP (1) EP0712465B1 (en)
JP (1) JP2723363B2 (en)
AU (1) AU7387394A (en)
CA (1) CA2168854A1 (en)
DE (1) DE69402428T2 (en)
FR (1) FR2708675B1 (en)
WO (1) WO1995004886A1 (en)

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Publication number Publication date
WO1995004886A1 (en) 1995-02-16
DE69402428T2 (en) 1997-10-23
FR2708675B1 (en) 1995-10-20
DE69402428D1 (en) 1997-05-07
EP0712465A1 (en) 1996-05-22
JP2723363B2 (en) 1998-03-09
US5655897A (en) 1997-08-12
JPH08510814A (en) 1996-11-12
CA2168854A1 (en) 1995-02-16
FR2708675A1 (en) 1995-02-10
AU7387394A (en) 1995-02-28

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