EP0759124B1 - Peristaltic pump device - Google Patents

Peristaltic pump device Download PDF

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Publication number
EP0759124B1
EP0759124B1 EP95920136A EP95920136A EP0759124B1 EP 0759124 B1 EP0759124 B1 EP 0759124B1 EP 95920136 A EP95920136 A EP 95920136A EP 95920136 A EP95920136 A EP 95920136A EP 0759124 B1 EP0759124 B1 EP 0759124B1
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EP
European Patent Office
Prior art keywords
shaft
wheels
axis
plate
cavity
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Expired - Lifetime
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EP95920136A
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German (de)
French (fr)
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EP0759124A1 (en
Inventor
Frédéric Neftel
Bernard Bouvier
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Debiotech SA
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Debiotech SA
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Publication of EP0759124A1 publication Critical patent/EP0759124A1/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

Definitions

  • the present invention relates to a pump device peristaltic and a peristaltic pump element.
  • Peristaltic pumps are notably, but not exclusively, used in the medical field to deliver drugs in liquid form, for example for infusions with a very regular flow.
  • these pumps consist of an engine assembly and a cassette.
  • the cassette is essentially consisting of a tube in which the liquid circulates pump, this tube being deformable and pressed against a wall.
  • the pebble drive is obtained by the rotation of the motor assembly shaft when the cassette climbed on the latter.
  • we define in the tube of the chambers filled with liquid we define in the tube of the chambers filled with liquid, the rotation of the rollers causing the displacement of these chambers from the entrance of the tube until his exit. This gives the transfer of the liquid from the inlet of the tube to its outlet with a very precise flow rate which depends on one hand on the volume of the tube between two crushing points and of course the speed of rotation of all the rollers.
  • a first object of the present invention is to provide a peristaltic pump device in which what has been called the cassette and which must be discarded after each use has a simpler structure and therefore a lower cost.
  • the second set constitutes the equivalent of part of the prior art cassette and will be called the insert.
  • This one has a very simple structure since it is reduced to a portion of wall preferably provided with a cover and the portion of deformable tubing which cooperates with the rollers. This structure is so very simple and inexpensive.
  • the set of pebbles is an integral part of the first set, i.e. motor device, this one of course not being changed between two uses of the peristaltic pump.
  • said cavity of the housing of the first set is substantially cylindrical of revolution around said shaft and has a bottom, and it is characterized in that said cavity further comprises means for guiding in translation of said plate in the direction of said shaft, and in that it is provided with elastic means interposed between said bottom and said plate tending to separate said plate from said bottom.
  • said means for mounting the rollers comprise a plate mounted freely in rotation on said plate around the axis of the orifice of said plate and provided with a passage opposite of said orifice capable of letting said shaft pass.
  • the peristaltic pump device consists on the one hand of an engine assembly and on the other part of a second assembly constituting the insert.
  • the insert 10 includes a housing 12 which defines an internal cavity cylindrical 14.
  • the cavity 14 is limited by a side wall cylindrical of the housing 16 corresponding to an angle at the center C greater than 180 ° and which is for example of the order of 210 °, the wall of the cavity being completed by a massive portion 18.
  • the upper edge of the wall 16 is preferably closed by a transparent cover or not 19.
  • the end lower 20 of the wall 16 is open. In other words, the cavity 14 opens out at its lower end.
  • a tubular conduit 22 made of a material deformable as will be explained later.
  • this tubular pipe 22 has a cross section shaped substantially ellipse whose major axis is parallel to the direction of the wall height.
  • the tubular conduit 22 is housed more precisely in a curved recess 24 on the internal face of the wall 16.
  • the inlet end 22a and the outlet end 22b of the tube 22 are fixed in the massive part 18 of the housing of the insert 10.
  • the tube 22 is thus completely immobilized inside the housing of the insert. As the shows Figure 1, the face of the tube 22 facing the inside of the cavity 14 is free.
  • the engine part which has the general reference 30 essentially comprises a housing 32 defining a cavity 34 capable of receive the cassette 10 as will be explained later.
  • the part motor 30 also comprises, mounted on the housing 32, a motor 36 of suitable type with the output shaft 38 projecting inside the cavity 34 along the axis of revolution of the cavity XX '.
  • the tree 38 comprises, in this mode, a frustoconical free end 40.
  • the shape of the internal cavity 34 of the housing 32 coincides with the external shape of the casing 12 of the cassette.
  • Cavity 34 has a bottom 42 through which the shaft 38 passes through the opening 44.
  • Inside the cavity 34 there is an assembly 46 for mounting rollers 48. In the particular embodiment described in connection with Figures 1 and 3, the number of rollers is 3 and they are referenced 48a, 48b and 48c.
  • the mounting assembly 46 consists essentially of a plate 50 whose external edge 50c coincides with the internal wall of the cavity 34. Thus the plate 50 can move inside the cavity 34 while being guided in translation in the direction XX '.
  • the tray 50 has an axial orifice 52.
  • the plate 54 On the plate 50 is mounted a guide plate for the rollers 54.
  • the plate 54 is rotatably mounted around the axis XX 'relative to the plate 50 but it is immobilized in translation relative to this same plate in the direction XX '.
  • This result is obtained by providing for example in the central part of the plate 54 a cylindrical sleeve 56 ending in a lip 58 which cooperates with a lower shoulder 59 of the center of the plate 50.
  • the sleeve 56 of the plate 54 defines an axial orifice 60 of diameter d greater than the diameter of the shaft 38.
  • the plate 54 has radial grooves 62a, 62b and 62c, the number of which is equal to the number of rollers 48.
  • the plate 54 is completed by an upper plate 64 integral with the plate 54 and itself provided with radial slots 66a, 66b and 66c coinciding with the grooves 62a of the lower plate 54.
  • Each roller 48a to 48c has a pivot axis xx ' materialized by a shaft 68, the ends 70 and 72 of which project out end faces 74 and 76 of each roller.
  • the ends 70 and 72 of the axis of each roller enter the grooves 62 and 66 respectively from the lower plate 54 and the upper plate 64.
  • the distance between these two plates is very slightly greater than the height h of the rollers in such a way that they can pivot freely around their axis xx 'while being substantially immobilized in translation in direction XX '.
  • each roller comprises a lateral face, preferably curved, 80 which has a diameter D around the axis xx '.
  • a spring 78 or any other suitable elastic system is disposed in the cavity 34 of the motor device and is interposed between the bottom 42 of the cavity and the underside 50b of the plate 50. The spring therefore tends to maintain in high position the plate 50 inside the cavity 54, the plate being retained by a shoulder 79 on the periphery of cavity 34.
  • the insert 10 is engaged around the rollers 48 of the motor device 30.
  • This engagement is easily done since the rollers 48 can move freely towards the axis XX 'under the effect of contact between the part of the tube 22 which projects into the cavity of the insert and the lateral surface 80 of the rollers 48a to 48c.
  • part of the lower end face 76 of the rollers 48 protrudes above the axial orifice 60 of the plate 54.
  • Figure 4 shows the insert engaged around the rollers 48.
  • the rollers and the insert are held in the high position under the action of the spring 78 tending to push the plate 50 towards the upper end of the cavity 34 thanks to the shoulder 79.
  • the frustoconical end 40 of the shaft 38 pushes back gradually the rollers 48a to 48c by moving them away from the axis XX ', which of course tends to locally compress the tube 22 at the three zones of contact.
  • the rollers are guided by the slides radial 62 and 66.
  • Figure 5 shows an alternative embodiment which allows facilitate the engagement of the insert 10 around the rollers 48 then the passage from the end of the shaft 38 between the rollers.
  • FIG. 5 shows that the periphery of the underside 76 of the rollers 48 is bevelled at 82.
  • the free end of the shaft 38 which is then referenced 40 ′ has, in an axial plane, a curvature which goes decreasing from the side wall 38a of the tree to its top 84.
  • FIG. 7 we will describe a second alternative embodiment of the peristaltic pump device.
  • the insert 10 not being modified, we will describe only the modifications to the motor means 30 '.
  • the 50 'plateau is always provided with its axial orifice 52 and its shoulder 59.
  • a sleeve 90 is mounted to rotate freely in orifice 52. It is immobilized in translation along the direction of the axis XX 'and its chamfered end 92 protrudes above the upper face 50a of the plateau.
  • Plate 54 ′ corresponding to plate 54 of FIG. 3, has an axial bore 94 which is engaged around the sleeve 90, it can slide in the bore 94.
  • the plate 54 ' has radial grooves 62 ′ in number equal to that of the rollers 48.
  • Each groove 62 ' has one end which opens into bore 94 and another closed end 96.
  • a slide 98 In each groove 62 ′ is mounted a slide 98.
  • Each slide 98 is pierced with an orifice 100 intended to receive the lower end 72 of the pivot axis of a roller.
  • the end 102 of the slide facing the bore 94 is rounded in a plane of vertical cut.
  • a return spring 104 is mounted in each groove 62 'between the slide 98 and the closed end 96 of the groove. Under the effect of spring 104, the end 102 of the slide 98 protrudes into the bore 94 coming to bear on the bevelled part 92 of the sleeve 90.
  • the upper plate 64 ' has the same structure as the plate lower 54 'with its grooves 66', its slides 98 'in which are engaged the upper ends 70 of the axes of the rollers 48 and its return springs 104 '.
  • a pusher 106 In the axial bore 94 'is engaged a pusher 106 having a beveled end 108 on which the slides 98 'are in support.
  • the tray 50 is pushed in. and the insert in the cavity 34 of the housing. During this insertion, the side wall of the shaft 38 completely pushes the rollers 48 so so that these locally compress the pipe 22.
  • the pump is then ready for use.
  • the roller 48a in FIG. 6a has its pivot axis x, x ' which is arranged in the plane of symmetry AA of the motor device, the two other rollers 48b and 48c being arranged symmetrically with respect to on plan AA '.
  • the rollers 48b and 48c being further away.
  • This particular positioning can be obtained by combination of a position sensor mounted in the housing 32 detecting the actual position of the rollers, this sensor controlling a limited operation of the motor to bring the roller 48a into the desired position.

Description

La présente invention a pour objet un dispositif de pompe péristaltique et un élément de pompe péristaltique.The present invention relates to a pump device peristaltic and a peristaltic pump element.

Les pompes péristaltiques sont notamment, mais non exclusivement, utilisées dans le domaine médical pour délivrer des médicaments sous forme liquide, par exemple pour des perfusions avec un débit très régulier.Peristaltic pumps are notably, but not exclusively, used in the medical field to deliver drugs in liquid form, for example for infusions with a very regular flow.

De façon classique, par exemple comme cela est décrit dans les demandes de brevet français Nos. 2 383 333 ou 2 644 212, ces pompes se composent d'un ensemble moteur et d'une cassette. La cassette est constituée essentiellement par un tube dans lequel circule le liquide à pomper, ce tube étant déformable et plaqué contre une paroi. A l'intérieur d'une boucle que forme ce tube, on trouve une pluralité de galets qui sont globalement entraínés en rotation sur eux-mêmes, ces galets écrasant ponctuellement le tube. L'entraínement des galets est obtenu par la rotation de l'arbre de l'ensemble moteur lorsque la cassette est montée sur ce dernier. Entre ces points d'écrasement, on définit dans le tube des chambres remplies de liquide, la rotation des galets provoquant le déplacement de ces chambres depuis l'entrée du tube jusqu'à sa sortie. On obtient ainsi le transfert du liquide de l'entrée du tube vers sa sortie avec un débit très précis et qui dépend d'une part du volume du tube entre deux points d'écrasement et bien sûr de la vitesse de rotation de l'ensemble des galets.Conventionally, for example as described in the French patent applications Nos. 2,383,333 or 2,644,212, these pumps consist of an engine assembly and a cassette. The cassette is essentially consisting of a tube in which the liquid circulates pump, this tube being deformable and pressed against a wall. AT inside a loop that this tube forms, there is a plurality of rollers which are generally rotated on themselves, these rollers punctually crushing the tube. The pebble drive is obtained by the rotation of the motor assembly shaft when the cassette climbed on the latter. Between these crushing points, we define in the tube of the chambers filled with liquid, the rotation of the rollers causing the displacement of these chambers from the entrance of the tube until his exit. This gives the transfer of the liquid from the inlet of the tube to its outlet with a very precise flow rate which depends on one hand on the volume of the tube between two crushing points and of course the speed of rotation of all the rollers.

On comprend qu'entre deux opérations d'administration de médicaments la partie moteur de la pompe peut être conservée mais que le tube devant bien sûr être changé, c'est en réalité l'ensemble de la cassette qui doit être changé. Or cette cassette comporte non seulement le tube mais également les galets d'entraínement dont l'usinage doit être très précis pour obtenir effectivement une grande précision de pompage. En d'autres termes, le coût de la cassette tout en étant réduit par rapport à celui de l'ensemble moteur n'en est pas moins non négligeable.We understand that between two operations of administration of drugs the motor part of the pump can be kept but that the tube of course to be changed, it is actually the whole cassette that needs to be changed. This cassette not only contains the tube but also the drive rollers whose machining must be very precise to actually get great precision from pumping. In other words, the cost of the cassette while being reduced compared to that of the engine assembly is no less negligible.

Le document US 4 705 464 décrit une pompe péristaltique dont les principales caractéristiques sont reprises dans le préambule de la revendication 1. The document US Pat. No. 4,705,464 describes a peristaltic pump of which the main features are included in the preamble to the claim 1.

Un premier objet de la présente invention est de fournir un dispositif de pompe péristaltique dans lequel ce qu'on a appelé la cassette et qui doit être jetée après chaque utilisation présente une structure plus simple et donc un coût plus réduit.A first object of the present invention is to provide a peristaltic pump device in which what has been called the cassette and which must be discarded after each use has a simpler structure and therefore a lower cost.

Pour atteindre ce but, le dispositif de pompe péristaltique selon l'invention se caractérise en ce qu'elle comprend :
   un premier ensemble comportant :

  • des moyens d'entraínement en rotation,
  • un arbre entraíné en rotation par lesdits moyens d'entraínement et présentant une extrémité libre,
  • un boítier présentant une cavité dans laquelle fait saillie l'extrémité libre dudit arbre,
  • une pluralité de galets, chaque galet présentant un axe de pivotement et une face latérale active de révolution autour dudit axe, et
  • des moyens de montage desdits galets comprenant :
    • un plateau monté déplaçable dans ladite cavité selon l'axe dudit arbre et présentant un orifice apte à laisser passer l'extrémité libre dudit arbre,
    • des moyens mobiles en rotation autour de la direction de l'axe dudit arbre par rapport audit plateau, lesdits moyens mobiles comprenant des moyens pour sensiblement immobiliser en translation lesdits galets par rapport audit plateau selon la direction de leurs axes de pivotement et pour maintenir l'axe de pivotement desdits galets parallèles audit axe de l'arbre, pour autoriser la rotation de chaque galet et pour guider en translation selon des directions rayonnantes les axes desdits galets ; et
       un deuxième ensemble indépendant du premier comprenant :
    • une paroi comportant au moins une portion cylindrique, et
    • une conduite tubulaire déformable solidaire de la face interne de ladite paroi,
par quoi, en engageant ledit deuxième ensemble autour des galets du premier ensemble, la paroi latérale desdits galets vient au contact de ladite conduite tubulaire en se déplaçant vers l'axe de rotation des moyens de montage de telle manière qu'une partie de chaque galet soit disposée en regard dudit orifice, et par quoi, en enfonçant lesdits moyens de montage dans la cavité dudit premier ensemble, l'extrémité libre dudit arbre pénètre à travers ledit orifice de telle manière que sa paroi latérale vienne au contact de la paroi latérale desdits galets en écartant lesdits galets dudit axe de l'arbre selon les directions rayonnantes en provoquant l'écrasement localisé de ladite conduite tubulaire entre lesdits galets et ladite paroi du deuxième ensemble.To achieve this object, the peristaltic pump device according to the invention is characterized in that it comprises:
a first set comprising:
  • rotary drive means,
  • a shaft driven in rotation by said drive means and having a free end,
  • a housing having a cavity in which the free end of said shaft projects;
  • a plurality of rollers, each roller having a pivot axis and an active lateral face of revolution about said axis, and
  • means for mounting said rollers comprising:
    • a plate mounted movable in said cavity along the axis of said shaft and having an orifice capable of allowing the free end of said shaft to pass,
    • means movable in rotation around the direction of the axis of said shaft relative to said plate, said mobile means comprising means for substantially immobilizing in translation said rollers relative to said plate in the direction of their pivot axes and for maintaining the pivot axis of said rollers parallel to said axis of the shaft, to allow the rotation of each roller and to guide in translation in radiating directions the axes of said rollers; and
    a second set independent of the first comprising:
    • a wall comprising at least one cylindrical portion, and
    • a deformable tubular pipe secured to the internal face of said wall,
whereby, by engaging said second set around the rollers of the first set, the side wall of said rollers comes into contact with said tubular conduit by moving towards the axis of rotation of the mounting means in such a way that part of each roller is arranged opposite said orifice, and whereby, by pushing said mounting means into the cavity of said first assembly, the free end of said shaft penetrates through said orifice so that its side wall comes into contact with the side wall of said rollers by moving said rollers away from said axis of the shaft in radiating directions, causing localized crushing of said tubular conduit between said rollers and said wall of the second set.

On comprend que ce qui est appelé deuxième ensemble constitue l'équivalent d'une partie de la cassette de l'art antérieur et sera appelé l'insert. Celui-ci a une structure très simple puisqu'il se réduit à une portion de paroi munie de préférence d'un couvercle et de la portion de tubulure déformable qui coopère avec les galets. Cette structure est donc très simple et peu onéreuse. On comprend que l'ensemble de galets fait partie intégrante du premier ensemble, c'est-à-dire du dispositif moteur, celui-ci n'étant bien sûr pas changé entre deux utilisations de la pompe péristaltique.We understand that what is called the second set constitutes the equivalent of part of the prior art cassette and will be called the insert. This one has a very simple structure since it is reduced to a portion of wall preferably provided with a cover and the portion of deformable tubing which cooperates with the rollers. This structure is so very simple and inexpensive. We understand that the set of pebbles is an integral part of the first set, i.e. motor device, this one of course not being changed between two uses of the peristaltic pump.

On comprend également que, grâce à la présence du plateau et des moyens de montage, il est possible de choisir des diamètres de galets différents d'une pompe à une autre, ce qui permet de modifier le débit de la pompe pour une vitesse de rotation donnée. Bien entendu, il faut adapter le diamètre de l'arbre moteur d'entraínement au diamètre des galets pour assurer le contact entre l'arbre et les galets.We also understand that, thanks to the presence of the plateau and mounting means, it is possible to choose diameters of different rollers from one pump to another, which allows you to change the pump flow for a given speed. Of course, it must adapt the diameter of the drive shaft to the diameter rollers to ensure contact between the shaft and the rollers.

Selon un mode préféré de mise en oeuvre du dispositif de pompe, ladite cavité du boítier du premier ensemble est sensiblement cylindrique de révolution autour dudit arbre et comporte un fond, et il se caractérise en ce que ladite cavité comporte en outre des moyens de guidage en translation dudit plateau selon la direction dudit arbre, et en ce qu'elle est munie de moyens élastiques interposés entre ledit fond et ledit plateau tendant à écarter ledit plateau dudit fond.According to a preferred embodiment of the pump device, said cavity of the housing of the first set is substantially cylindrical of revolution around said shaft and has a bottom, and it is characterized in that said cavity further comprises means for guiding in translation of said plate in the direction of said shaft, and in that it is provided with elastic means interposed between said bottom and said plate tending to separate said plate from said bottom.

De préférence également, lesdits moyens de montage des galets comprennent une plaque montée libre en rotation sur ledit plateau autour de l'axe de l'orifice dudit plateau et munie d'un passage en regard dudit orifice apte à laisser passer ledit arbre.Preferably also, said means for mounting the rollers comprise a plate mounted freely in rotation on said plate around the axis of the orifice of said plate and provided with a passage opposite of said orifice capable of letting said shaft pass.

L'invention concerne également un élément de pompe péristaltique destiné à coopérer avec une conduite tubulaire déformable (22) ayant un axe longitudinal présentant une position en forme d'arc de cercle, comprenant :

  • des moyens d'entraínement en rotation (36),
  • un arbre (38) entraíné en rotation par lesdits moyens d'entraínement et présentant une extrémité libre (40),
  • un boítier (32) présentant une cavité (34) dans laquelle fait saillie l'extrémité libre dudit arbre,
  • une pluralité de galets (48), chaque galet présentant un axe de pivotement et une face latérale (80) active de révolution autour dudit axe, et
  • des moyens de montage desdits galets comprenant un plateau (50) monté déplaçable dans ladite cavité selon l'axe dudit arbre et présentant un orifice (52) apte à laisser passer l'extrémité libre dudit arbre, ledit élément de pompe se caractérisant en ce que lesdits moyens de montage comprennent en outre :
    • des moyens mobiles en rotation (54, 64) autour de la direction de l'axe dudit arbre par rapport audit plateau, lesdits moyens mobiles comprenant des moyens pour sensiblement immobiliser en translation lesdits galets par rapport audit plateau selon la direction de leurs axes de pivotement, pour maintenir l'axe de pivotement desdits galets parallèles audit axe de l'arbre, pour autoriser la rotation de chaque galet et pour guider en translation (62, 66) selon des directions rayonnantes les axes desdits galets ;
    par quoi, en engageant ladite conduite tubulaire (22) autour des galets, la paroi latérale desdits galets vient au contact vers l'axe de rotation des moyens de montage de telle manière qu'une partie de chaque galet soit disposée en regard dudit orifice, et
    par quoi, en enfonçant lesdits moyens de montage dans ladite cavité, l'extrémité libre dudit arbre pénètre à travers ledit orifice de telle manière que la paroi latérale de l'arbre en coopérant avec lesdits galets écarte lesdits galets de l'axe de l'arbre selon les directions rayonnantes en provoquant l'écrasement localisé de ladite conduite tubulaire.
  • la figure 1 est une vue de dessus du dispositif moteur avant la mise en place de l'insert ;
  • la figure 2 est une vue de dessus de l'insert ;
  • la figure 3 est une vue en coupe verticale du dispositif de pompe montrant l'insert et le dispositif moteur séparés ;
  • la figure 4 est une vue semblable à la figure 3 mais montrant l'insert engagé sur les galets du dispositif moteur ;
  • la figure 5 montre une partie du dispositif de pompe péristaltique selon une première variante de réalisation ;
  • les figures 6a et 6b montrent en vue de dessus respectivement l'engagement de l'insert et l'enfoncement de l'insert et des galets selon la première variante de réalisation ;et
  • la figure 7 montre une vue partielle de la partie moteur d'une deuxième variante de réalisation.
The invention also relates to a peristaltic pump element intended to cooperate with a deformable tubular pipe (22) having a longitudinal axis having a position in the form of an arc of a circle, comprising:
  • rotary drive means (36),
  • a shaft (38) rotated by said drive means and having a free end (40),
  • a housing (32) having a cavity (34) in which the free end of said shaft projects;
  • a plurality of rollers (48), each roller having a pivot axis and a side face (80) active in revolution about said axis, and
  • means for mounting said rollers comprising a plate (50) mounted movable in said cavity along the axis of said shaft and having an orifice (52) capable of allowing the free end of said shaft to pass, said pump element being characterized in that said mounting means further comprise:
    • movable means in rotation (54, 64) around the direction of the axis of said shaft relative to said plate, said movable means comprising means for substantially immobilizing in translation said rollers relative to said plate in the direction of their pivot axes , to maintain the pivot axis of said rollers parallel to said axis of the shaft, to allow rotation of each roller and to guide in translation (62, 66) in radiating directions the axes of said rollers;
    whereby, by engaging said tubular conduit (22) around the rollers, the side wall of said rollers comes into contact towards the axis of rotation of the mounting means in such a way that part of each roller is disposed opposite said orifice, and
    whereby, by inserting said mounting means into said cavity, the free end of said shaft penetrates through said orifice so that the side wall of the shaft, cooperating with said rollers, separates said rollers from the axis of the shaft in radiating directions, causing localized crushing of said tubular pipe.
  • Figure 1 is a top view of the drive device before the introduction of the insert;
  • Figure 2 is a top view of the insert;
  • Figure 3 is a vertical sectional view of the pump device showing the insert and the separate motor device;
  • Figure 4 is a view similar to Figure 3 but showing the insert engaged on the rollers of the motor device;
  • Figure 5 shows a part of the peristaltic pump device according to a first alternative embodiment;
  • FIGS. 6a and 6b show a top view, respectively, of the engagement of the insert and of the insertion of the insert and the rollers according to the first alternative embodiment; and
  • Figure 7 shows a partial view of the engine part of a second alternative embodiment.

Comme on l'a déjà indiqué le dispositif de pompe péristaltique selon l'invention se compose d'une part d'un ensemble moteur et d'autre part d'un deuxième ensemble constituant l'insert.As already indicated the peristaltic pump device according to the invention consists on the one hand of an engine assembly and on the other part of a second assembly constituting the insert.

En se référant tout d'abord aux figures 2 et 3, on va décrire l'insert qui porte la référence générale 10. Comme le montre la figure 2, l'insert 10 comporte un boítier 12 qui définit une cavité interne cylindrique 14. La cavité 14 est limitée par une paroi latérale cylindrique du boítier 16 correspondant à un angle au centre C supérieur à 180° et qui est par exemple de l'ordre de 210°, la paroi de la cavité étant complétée par une portion massive 18. Comme le montre mieux la figure 3, le bord supérieur de la paroi 16 est de préférence fermé par un couvercle transparent ou non 19. En revanche, l'extrémité inférieure 20 de la paroi 16 est ouverte. En d'autres termes, la cavité 14 est débouchante à son extrémité inférieure. A l'intérieur de la cavité 14 est montée une conduite tubulaire 22 réalisée en un matériau déformable comme on l'expliquera ultérieurement. De préférence, au repos, cette conduite tubulaire 22 a une section droite en forme sensiblement d'ellipse dont le grand axe est parallèle à la direction de la hauteur de la paroi. La conduite tubulaire 22 est logée plus précisément dans un évidement incurvé 24 de la face interne de la paroi 16. L'extrémité d'entrée 22a et l'extrémité de sortie 22b du tube 22 sont fixées dans la partie massive 18 du boítier de l'insert 10. Le tube 22 est ainsi totalement immobilisé à l'intérieur du boítier de l'insert. Comme le montre la figure 1, la face du tube 22 tournée vers l'intérieur de la cavité 14 est libre.Referring first to Figures 2 and 3, we will describe the insert which bears the general reference 10. As shown in FIG. 2, the insert 10 includes a housing 12 which defines an internal cavity cylindrical 14. The cavity 14 is limited by a side wall cylindrical of the housing 16 corresponding to an angle at the center C greater than 180 ° and which is for example of the order of 210 °, the wall of the cavity being completed by a massive portion 18. As shown better in Figure 3, the upper edge of the wall 16 is preferably closed by a transparent cover or not 19. On the other hand, the end lower 20 of the wall 16 is open. In other words, the cavity 14 opens out at its lower end. Inside the cavity 14 is mounted a tubular conduit 22 made of a material deformable as will be explained later. Preferably, at rest, this tubular pipe 22 has a cross section shaped substantially ellipse whose major axis is parallel to the direction of the wall height. The tubular conduit 22 is housed more precisely in a curved recess 24 on the internal face of the wall 16. The inlet end 22a and the outlet end 22b of the tube 22 are fixed in the massive part 18 of the housing of the insert 10. The tube 22 is thus completely immobilized inside the housing of the insert. As the shows Figure 1, the face of the tube 22 facing the inside of the cavity 14 is free.

En se référant maintenant aux figures 1 et 3, on va décrire un premier mode de réalisation de la partie moteur du dispositif de pompe péristaltique. La partie moteur qui porte la référence générale 30 comporte essentiellement un boítier 32 définissant une cavité 34 apte à recevoir la cassette 10 comme on l'expliquera ultérieurement. La partie moteur 30 comporte également, monté sur le boítier 32, un moteur 36 de type convenable dont l'arbre de sortie 38 fait saillie à l'intérieur de la cavité 34 selon l'axe de révolution de la cavité XX'. L'arbre 38 comporte, dans ce mode, une extrémité libre tronconique 40. Comme le montre mieux la figure 1, la forme de la cavité interne 34 du boítier 32 coïncide avec la forme externe du boítier 12 de la cassette. La cavité 34 présente un fond 42 à travers lequel passe l'arbre 38 par l'ouverture 44. A l'intérieur de la cavité 34, on trouve un ensemble 46 de montage de galets 48. Dans le mode particulier de réalisation décrit en liaison avec les figures 1 et 3, le nombre de galets est égal à 3 et ils sont référencés 48a, 48b et 48c.Referring now to Figures 1 and 3, we will describe a first embodiment of the motor part of the pump device peristaltic. The engine part which has the general reference 30 essentially comprises a housing 32 defining a cavity 34 capable of receive the cassette 10 as will be explained later. The part motor 30 also comprises, mounted on the housing 32, a motor 36 of suitable type with the output shaft 38 projecting inside the cavity 34 along the axis of revolution of the cavity XX '. The tree 38 comprises, in this mode, a frustoconical free end 40. As the shows better in Figure 1, the shape of the internal cavity 34 of the housing 32 coincides with the external shape of the casing 12 of the cassette. Cavity 34 has a bottom 42 through which the shaft 38 passes through the opening 44. Inside the cavity 34, there is an assembly 46 for mounting rollers 48. In the particular embodiment described in connection with Figures 1 and 3, the number of rollers is 3 and they are referenced 48a, 48b and 48c.

L'ensemble de montage 46 est constitué essentiellement par un plateau 50 dont le bord externe 50c coïncide avec la paroi interne de la cavité 34. Ainsi le plateau 50 peut se déplacer à l'intérieur de la cavité 34 tout en étant guidé en translation selon la direction XX'. Le plateau 50 présente un orifice axial 52.The mounting assembly 46 consists essentially of a plate 50 whose external edge 50c coincides with the internal wall of the cavity 34. Thus the plate 50 can move inside the cavity 34 while being guided in translation in the direction XX '. The tray 50 has an axial orifice 52.

Sur le plateau 50 est montée une plaque de guidage des galets 54. Dans l'exemple considéré, la plaque 54 est montée rotative autour de l'axe XX' par rapport au plateau 50 mais elle est immobilisée en translation par rapport à ce même plateau selon la direction XX'. Ce résultat est obtenu en prévoyant par exemple dans la partie centrale de la plaque 54 un manchon cylindrique 56 se terminant par une lèvre 58 qui coopère avec un épaulement inférieur 59 du centre du plateau 50. Le manchon 56 de la plaque 54 définit un orifice axial 60 de diamètre d supérieur au diamètre d' de l'arbre 38. La plaque 54 présente des rainures radiales 62a, 62b et 62c dont le nombre est égal au nombre de galets 48. La plaque 54 est complétée par une plaque supérieure 64 solidaire de la plaque 54 et elle-même munie de fentes radiales 66a, 66b et 66c coïncidant avec les rainures 62a de la plaque inférieure 54. On the plate 50 is mounted a guide plate for the rollers 54. In the example considered, the plate 54 is rotatably mounted around the axis XX 'relative to the plate 50 but it is immobilized in translation relative to this same plate in the direction XX '. This result is obtained by providing for example in the central part of the plate 54 a cylindrical sleeve 56 ending in a lip 58 which cooperates with a lower shoulder 59 of the center of the plate 50. The sleeve 56 of the plate 54 defines an axial orifice 60 of diameter d greater than the diameter of the shaft 38. The plate 54 has radial grooves 62a, 62b and 62c, the number of which is equal to the number of rollers 48. The plate 54 is completed by an upper plate 64 integral with the plate 54 and itself provided with radial slots 66a, 66b and 66c coinciding with the grooves 62a of the lower plate 54.

Chaque galet 48a à 48c comporte un axe de pivotement xx' matérialisé par un arbre 68 dont les extrémités 70 et 72 font saillie hors des faces d'extrémité 74 et 76 de chaque galet. Les extrémités 70 et 72 de l'axe de chaque galet pénètrent dans les rainures 62 et 66 respectivement de la plaque inférieure 54 et de la plaque supérieure 64. La distance entre ces deux plaques est très légèrement supérieure à la hauteur h des galets de telle manière que ceux-ci puissent pivoter librement autour de leur axe xx' tout en étant sensiblement immobilisé en translation selon la direction XX'. Comme le montre la figure 3, chaque galet comprend une face latérale, de préférence bombée, 80 qui présente autour de l'axe xx' un diamètre D.Each roller 48a to 48c has a pivot axis xx ' materialized by a shaft 68, the ends 70 and 72 of which project out end faces 74 and 76 of each roller. The ends 70 and 72 of the axis of each roller enter the grooves 62 and 66 respectively from the lower plate 54 and the upper plate 64. The distance between these two plates is very slightly greater than the height h of the rollers in such a way that they can pivot freely around their axis xx 'while being substantially immobilized in translation in direction XX '. As shown in Figure 3, each roller comprises a lateral face, preferably curved, 80 which has a diameter D around the axis xx '.

En outre, un ressort 78 ou tout autre système élastique adapté est disposé dans la cavité 34 du dispositif moteur et est interposé entre le fond 42 de la cavité et la face inférieure 50b du plateau 50. Le ressort tend donc à maintenir en position haute le plateau 50 à l'intérieur de la cavité 54, le plateau étant retenu par un épaulement 79 de la périphérie de la cavité 34.In addition, a spring 78 or any other suitable elastic system is disposed in the cavity 34 of the motor device and is interposed between the bottom 42 of the cavity and the underside 50b of the plate 50. The spring therefore tends to maintain in high position the plate 50 inside the cavity 54, the plate being retained by a shoulder 79 on the periphery of cavity 34.

En se référant maintenant plus particulièrement aux figures 3 et 4, on va décrire le mode d'utilisation du dispositif de pompe péristaltique selon son premier mode de réalisation.Referring now more particularly to FIGS. 3 and 4, we will describe the mode of use of the pump device peristaltic according to its first embodiment.

Initialement, on a d'une part l'ensemble moteur 30 avec son plateau 50 en position haute sur lequel sont emprisonnés les galets 48a à 48c. Par ailleurs on a l'insert 10 dans lequel est fixée une partie de la tubulure 22 dans laquelle circulera le liquide à pomper. Cest ce qui représenté sur la figure 3.Initially, we have on the one hand the motor assembly 30 with its plate 50 in the high position on which the rollers 48a are trapped at 48c. Furthermore, there is the insert 10 in which part of the tubing 22 in which the liquid to be pumped will circulate. That is what shown in figure 3.

Dans un premier temps, on engage l'insert 10 autour des galets 48 du dispositif moteur 30. Cet engagement se fait aisément puisque les galets 48 peuvent se déplacer librement vers l'axe XX' sous l'effet du contact entre la partie du tube 22 qui fait saillie dans la cavité de l'insert et la surface latérale 80 des galets 48a à 48c. Comme le montre la figure 4, à la fin de cette opération, une partie de la face d'extrémité inférieure 76 des galets 48 fait saillie au-dessus de l'orifice axial 60 de la plaque 54.Firstly, the insert 10 is engaged around the rollers 48 of the motor device 30. This engagement is easily done since the rollers 48 can move freely towards the axis XX 'under the effect of contact between the part of the tube 22 which projects into the cavity of the insert and the lateral surface 80 of the rollers 48a to 48c. As shown in the figure 4, at the end of this operation, part of the lower end face 76 of the rollers 48 protrudes above the axial orifice 60 of the plate 54.

La figure 4 montre l'insert engagé autour des galets 48. Les galets et l'insert sont maintenus en position haute sous l'action du ressort 78 tendant à repousser le plateau 50 vers l'extrémité supérieure de la cavité 34 grâce à l'épaulement 79. Dans un deuxième temps, on enfonce l'insert 10 et donc le plateau 50 en comprimant le ressort 78. Durant cette opération, l'extrémité tronconique 40 de l'arbre 38 repousse progressivement les galets 48a à 48c en les écartant de l'axe XX', ce qui tend bien sûr à comprimer localement le tube 22 aux trois zones de contact. Lors de cet écartement, les galets sont guidés par les glissières radiales 62 et 66. Lorsque le plateau 50 est entièrement enfoncé dans la cavité 34 et concomitamment l'insert 10, la paroi latérale 38a de l'arbre d'entraínement 38 coopère avec pression avec les parois latérales 80 des trois galets 48a, 48b, 48c, ceux-ci par ailleurs obturant complètement le tube 22 aux points de contact avec les galets. Lorsque cette opération est terminée, des moyens d'enclipsage non représentés sur les figures permettent de maintenir l'insert 10 à l'intérieur de la cavité 34 du boítier 32. Dans cette position, le dispositif de pompe péristaltique est prêt à fonctionner.Figure 4 shows the insert engaged around the rollers 48. The rollers and the insert are held in the high position under the action of the spring 78 tending to push the plate 50 towards the upper end of the cavity 34 thanks to the shoulder 79. In a second step, we push the insert 10 and therefore the plate 50 by compressing the spring 78. During this operation, the frustoconical end 40 of the shaft 38 pushes back gradually the rollers 48a to 48c by moving them away from the axis XX ', which of course tends to locally compress the tube 22 at the three zones of contact. During this spacing, the rollers are guided by the slides radial 62 and 66. When the plate 50 is fully inserted into the cavity 34 and concomitantly the insert 10, the side wall 38a of the shaft 38 co-operates with pressure with the side walls 80 of three rollers 48a, 48b, 48c, these otherwise completely sealing the tube 22 at the points of contact with the rollers. When this operation is completed, clipping means not shown in the figures keep the insert 10 inside the cavity 34 of the housing 32. In this position, the peristaltic pump device is ready to function.

Comme cela est bien connu, sous l'effet du moteur 36 et de la rotation de l'arbre 38 par frottement entre celui-ci et la paroi latérale des galets 48, on provoque la rotation des galets autour de leurs axes xx' et la rotation globale de ces galets autour de l'axe XX' par l'intermédiaire de la plaque 54. Il en résulte la mise en circulation du liquide dans la conduite 22.As is well known, under the effect of the motor 36 and the rotation of the shaft 38 by friction between the latter and the side wall rollers 48, the rollers are caused to rotate about their axes xx ' and the overall rotation of these rollers around the axis XX 'by through the plate 54. This results in the circulation of the liquid in line 22.

En outre, il faut souligner que, grâce à la présence du plateau 50 et de la plaque de guidage 54 des galets 48, on peut choisir le nombre et le diamètre D des galets afin de définir le débit pour une vitesse de rotation donnée de l'arbre 38. Il faut bien sûr adapter le diamètre d' de celui-ci pour obtenir effectivement l'obturation du tube 22 aux points de contact avec les galets.In addition, it should be emphasized that, thanks to the presence of the plate 50 and from the guide plate 54 of the rollers 48, one can choose the number and the diameter D of the rollers in order to define the flow rate for a speed of given rotation of the shaft 38. It is of course necessary to adapt the diameter of this one to effectively obtain the obturation of the tube 22 at the points contact with the rollers.

La figure 5 montre une variante de réalisation qui permet de faciliter l'engagement de l'insert 10 autour des galets 48 puis le passage de l'extrémité de l'arbre 38 entre les galets.Figure 5 shows an alternative embodiment which allows facilitate the engagement of the insert 10 around the rollers 48 then the passage from the end of the shaft 38 between the rollers.

La figure 5 montre que la périphérie de la face inférieure 76 des galets 48 est biseautée en 82. En outre, l'extrémité libre de l'arbre 38 qui est alors référencée 40' présente, dans un plan axial, une courbure qui va en diminuant depuis la paroi latérale 38a de l'arbre jusqu'à son sommet 84. FIG. 5 shows that the periphery of the underside 76 of the rollers 48 is bevelled at 82. In addition, the free end of the shaft 38 which is then referenced 40 ′ has, in an axial plane, a curvature which goes decreasing from the side wall 38a of the tree to its top 84.

En outre, dans les rainures radiales 62 et 66 qui reçoivent les extrémités 70 et 72 des axes de pivotement des galets sont montés des ressorts de rappel 86 ou autres systèmes élastiques qui tendent à repousser les galets vers l'axe XX' du plateau 50.In addition, in the radial grooves 62 and 66 which receive the ends 70 and 72 of the pivot axes of the rollers are mounted return springs 86 or other elastic systems which tend to push the rollers towards the axis XX 'of the plate 50.

Ces ressorts sont interposés entre l'extrémité 70 ou 72 de l'axe de pivotement des galets et l'extrémité fermée 88 des rainures 62 ou 66.These springs are interposed between the end 70 or 72 of the axis of pivoting of the rollers and the closed end 88 of the grooves 62 or 66.

On comprend que les dispositions décrites en liaison avec la figure 5 facilitent la mise en place de l'insert 10 autour des galets 48 puisque ceux-ci sont maintenus à proximité de l'axe XX' par les ressorts 86.It is understood that the arrangements described in connection with the Figure 5 facilitate the establishment of the insert 10 around the rollers 48 since these are kept close to the XX 'axis by the springs 86.

Lors de l'enfoncement du plateau 50, la forme particulière de l'extrémité 40' de l'arbre et le biseau prévu à la périphérie des faces inférieures des galets favorisent le passage de l'arbre entre les galets par repoussement de ces derniers du fait de la compression des ressorts 86. Lors du fonctionnement de la pompe péristaltique, ces ressorts accroissent la force de contact entre la paroi latérale 80 des galets et la paroi latérale de l'arbre.When the plate 50 is pushed in, the particular shape of the end 40 'of the shaft and the bevel provided at the periphery of the faces lower rollers favor the passage of the shaft between the rollers by repulsion of the latter due to the compression of the springs 86. During operation of the peristaltic pump, these springs increase the contact force between the side wall 80 of the rollers and the side wall of the tree.

En se référant maintenant à la figure 7, on va décrire une deuxième variante de réalisation du dispositif de pompe péristaltique. L'insert 10 n'étant pas modifié, on va décrire seulement les modifications apportées aux moyens moteurs 30'. Le plateau 50' est toujours muni de son orifice axial 52 et son épaulement 59. Un manchon 90 est monté libre en rotation dans l'orifice 52. Il est immobilisé en translation selon la direction de l'axe XX' et son extrémité 92 chanfreinée fait saillie au-dessus de la face supérieure 50a du plateau. La plaque 54', correspondant à la plaque 54 de la figure 3, présente un alésage axial 94 qui est engagé autour du manchon 90, celui-ci pouvant coulisser dans l'alésage 94. La plaque 54' comporte des rainures radiales 62' en nombre égal à celui des galets 48. Chaque rainure 62' a une extrémité qui débouche dans l'alésage 94 et une autre extrémité fermée 96. Dans chaque rainure 62' est monté un coulisseau 98. Chaque coulisseau 98 est percé d'un orifice 100 destiné à recevoir l'extrémité inférieure 72 de l'axe de pivotement d'un galet. L'extrémité 102 du coulisseau tournée vers l'alésage 94 est arrondie dans un plan de coupe vertical. Referring now to Figure 7, we will describe a second alternative embodiment of the peristaltic pump device. The insert 10 not being modified, we will describe only the modifications to the motor means 30 '. The 50 'plateau is always provided with its axial orifice 52 and its shoulder 59. A sleeve 90 is mounted to rotate freely in orifice 52. It is immobilized in translation along the direction of the axis XX 'and its chamfered end 92 protrudes above the upper face 50a of the plateau. Plate 54 ′, corresponding to plate 54 of FIG. 3, has an axial bore 94 which is engaged around the sleeve 90, it can slide in the bore 94. The plate 54 'has radial grooves 62 ′ in number equal to that of the rollers 48. Each groove 62 'has one end which opens into bore 94 and another closed end 96. In each groove 62 ′ is mounted a slide 98. Each slide 98 is pierced with an orifice 100 intended to receive the lower end 72 of the pivot axis of a roller. The end 102 of the slide facing the bore 94 is rounded in a plane of vertical cut.

Un ressort de rappel 104 est monté dans chaque rainure 62' entre le coulisseau 98 et l'extrémité fermée 96 de la rainure. Sous l'effet du ressort 104, l'extrémité 102 du coulisseau 98 fait saillie dans l'alésage 94 en venant en appui sur la partie biseautée 92 du manchon 90.A return spring 104 is mounted in each groove 62 'between the slide 98 and the closed end 96 of the groove. Under the effect of spring 104, the end 102 of the slide 98 protrudes into the bore 94 coming to bear on the bevelled part 92 of the sleeve 90.

La plaque supérieure 64' a la même structure que la plaque inférieure 54' avec ses rainures 66', ses coulisseaux 98' dans lesquels sont engagées les extrémités supérieures 70 des axes des galets 48 et ses ressorts de rappel 104'. Dans l'alésage axial 94' est engagé un poussoir 106 présentant une extrémité biseautée 108 sur laquelle les coulisseaux 98' sont en appui.The upper plate 64 'has the same structure as the plate lower 54 'with its grooves 66', its slides 98 'in which are engaged the upper ends 70 of the axes of the rollers 48 and its return springs 104 '. In the axial bore 94 'is engaged a pusher 106 having a beveled end 108 on which the slides 98 'are in support.

L'utilisation du mode de réalisation de la figure 6 du dispositif de pompe péristaltique est la suivante. Au repos les galets 48 sont repoussés vers l'axe XX' par les ressorts 104 et 104'. L'engagement de l'insert 10 autour des galets est donc très facile. Lorsque l'insert est presque totalement engagé autour des galets 48, le poussoir 106 est enfoncé dans l'alésage 94' soit manuellement, soit par l'intermédiaire du couvercle de l'insert s'il existe. L'enfoncement du poussoir 106 et l'enfoncement du manchon 90 dans l'alésage 94 qui en résulte provoquent le repoussement des coulisseaux 98 et 98' dans leurs rainures par compression des ressorts 104 et 104'. Cela entraíne l'écartement des galets 48. Cet écartement se produit jusqu'à ce que les portions cylindriques du manchon 90 et du poussoir 106 soient au contact des coulisseaux 98 et 98'. Dans cette position, la distance entre les faces latérales 80 des galets est un peu inférieure au diamètre de l'arbre 38.The use of the embodiment of Figure 6 of the device peristaltic pump is as follows. At rest the rollers 48 are pushed back towards the axis XX 'by the springs 104 and 104'. The commitment of the insert 10 around the rollers is therefore very easy. When the insert is almost completely engaged around the rollers 48, the pusher 106 is pressed into the bore 94 'either manually or via the insert cover if there is one. The push of pushbutton 106 and the insertion of the sleeve 90 into the bore 94 which results therefrom cause the slides 98 and 98 'to push back in their grooves by compression of springs 104 and 104 '. This implies the spacing of the rollers 48. This spacing occurs until the cylindrical portions of the sleeve 90 and the pusher 106 are at contact of slides 98 and 98 '. In this position, the distance between the lateral faces 80 of the rollers is slightly less than the diameter of tree 38.

Dans l'étape suivante, on procède à l'enfoncement du plateau 50 et de l'insert dans la cavité 34 du boítier. Lors de cet enfoncement, la paroi latérale de l'arbre 38 repousse complètement les galets 48 de telle manière que ceux-ci viennent comprimer localement la conduite 22.In the next step, the tray 50 is pushed in. and the insert in the cavity 34 of the housing. During this insertion, the side wall of the shaft 38 completely pushes the rollers 48 so so that these locally compress the pipe 22.

La pompe est alors prête à être utilisée.The pump is then ready for use.

Comme le montre la figure 6a, de préférence, à l'arrêt du moteur l'un des galets, le galet 48a sur la figure 6a a son axe de pivotement x,x' qui est disposé dans le plan de symétrie AA du dispositif moteur, les deux autres galets 48b et 48c étant disposés symétriquement par rapport au plan AA'. Compte tenu de la courbure du tube 22 dans l'insert, cela fait que seul le galet 48a se trouve proche du tube 22 lors de la mise en place de l'insert, les galets 48b et 48c s'en trouvant plus éloigné. On comprend que l'engagement de l'insert 10 autour des galets en est facilité. Ce positionnement particulier peut être obtenu par la combinaison d'un capteur de position monté dans le boítier 32 détectant la position effective des galets, ce capteur commandant un fonctionnement limité du moteur pour amener le galet 48a dans la position voulue.As shown in Figure 6a, preferably when the engine is stopped one of the rollers, the roller 48a in FIG. 6a has its pivot axis x, x ' which is arranged in the plane of symmetry AA of the motor device, the two other rollers 48b and 48c being arranged symmetrically with respect to on plan AA '. Given the curvature of the tube 22 in the insert, this fact that only the roller 48a is close to the tube 22 when setting place of the insert, the rollers 48b and 48c being further away. We understands that the engagement of the insert 10 around the rollers is ease. This particular positioning can be obtained by combination of a position sensor mounted in the housing 32 detecting the actual position of the rollers, this sensor controlling a limited operation of the motor to bring the roller 48a into the desired position.

Claims (14)

  1. A peristaltic pump system, comprising:
    a first assembly comprising rotary drive means (36) and a shaft (38) rotated by said drive means and having a free end (40),
    a housing (32) presenting a cavity (34) into which the free end of said shaft projects;
    a plurality of wheels (48), each wheel having a pivot axis and an active tread face (80) that is symmetrical about said axis; and
    mounting means for said wheels comprising a plate (50) mounted to move in said cavity along the axis of said shaft and having an orifice (52) suitable for allowing the free end of said shaft to pass therethrough, said system being characterised in that :
       said housing, said plurality of wheels and said mounting means form a part of said first assembly ;
       in that said mounting means further comprise :
    movable means (54, 64) movable in rotation about the direction of the axis of said shaft relative to said plate, said movable means comprising means for substantially preventing said wheels from moving in translation relative to said plate along the direction of their pivot axes, for holding the pivot axes of said wheels parallel to said axis of the shaft, for allowing each wheel to rotate, and for guiding (62, 66) the axes of said wheels in translation along radial directions; and in that said system further comprises :
       a second assembly, independent of the first and comprising:
    a wall (16) including at least a cylindrical portion; and
    a deformable tubular duct (22) secured to the inside face of said wall;
    whereby, by engaging said second assembly around the wheels of the first assembly, the tread walls of said wheels come into contact towards the axis of rotation of the mounting means in such a manner that a portion of each wheel is disposed facing said orifice; and
    whereby, by pushing down said mounting means into the cavity of said first assembly, the free end of said shaft penetrates through said orifice so that the side wall of the shaft co-operates with said wheels to spread said wheels apart in radial directions away from the axis of the shaft, thereby causing said tubular duct to be locally squeezed between said wheels and said wall of said second assembly.
  2. A pump system according to claim 1, characterized in that said cavity (34) of the housing (32) of the first assembly is substantially circularly cylindrical about said shaft and includes a bottom (42), in that said cavity further includes means (34) for guiding said plate in translation along the direction of said shaft, and in that said cavity is provided with resilient means (78) interposed between said bottom and said plate tending to move said plate away from said bottom.
  3. A pump system according to claim 1 or 2, characterized in that said wheel mounting means comprise a turntable (54) mounted to rotate freely on said plate (50) about the axis of the orifice (52) in said plate and provided with a passage (60) in register with said orifice and suitable for allowing said shaft (38) to pass therethrough.
  4. A pump system according to claim 3, characterized in that it comprises n wheels (48), each wheel further presenting two end faces (74, 76) perpendicular to its pivot axis, the ends (70, 72) of said pivot axis projecting beyond said end faces.
  5. A pump system according to claim 4, characterized in that said turntable (54) of the mounting means comprises n slideway forming means (62, 66) suitable for receiving respective ends of the pivot axes of said wheels, said slideway forming means extending radially relative to the axis of said passage.
  6. A pump system according to any one of claims 1 to 5, characterized in that the end (40) of said shaft (38) is conical to facilitate passing said shaft between said wheels (48) when said mounting means are being pushed down into the cavity.
  7. A pump system according to any one of claims 1 to 5, characterized in that the end (40) of said shaft (38) has an outline in an axial section plane presenting a radius of curvature that decreases going away from the cylindrical portion of said shaft.
  8. A pump system according to claim 4 or 5, characterized in that the periphery of the end face (76) of each wheel closest to said plate is chamfered (82).
  9. A pump system according to any one of claims 1 to 8, characterized in that said assembly means further comprise resilient means (86, 104, 104') urging said wheels (48) towards the center of said plate (50).
  10. A pump system according to claim 5, characterized in that said mounting means include a top disk (64, 64') secured to said tumtable (54, 54') and parallel therewith, said top disk having n other slideway forming means (66) designed to receive respective other ends (70) of the pivot axes of said wheels (48).
  11. A pump system according to claim 10, characterized in that each slideway forming means (62', 66') is provided with a slider (98, 98') having an orifice (100), the ends (70, 72) of the pivot axes of the wheels being engaged in said orifices, resilient means (104, 104') being disposed in each slideway forming means between the outer end of a slideway forming means and the corresponding slider.
  12. A pump system according to claim 11, characterized in that said first assembly further comprises pushbutton forming means (106) movable in translation relative to said turntable (54') and said top disk (64'), suitable for co-operating with said sliders (98, 98') to cause said wheels (48) to be spread apart in limited manner prior to the assembly means being pushed down into the cavity (34) of said first assembly.
  13. A pump system according to any one of claims 1 to 11, characterized in that said tubular duct (22) is elliptical in shape in right section.
  14. A peristaltic pump element designed to cooperate with a deformable tubular duct (22) with a longitudinal axis having a position in the form of an arc of a circle, comprising:
    rotary drive means (36),
    a shaft (38) rotated by said drive means and having a free end (40),
    a housing (32) presenting a cavity (34) into which the free end of said shaft projects,
    a plurality of wheels (48), each wheel having a pivot axis and an active tread face (80) that is symmetrical about said axis; and
    mounting means for said wheels comprising a plate (50) mounted to move in said cavity along the axis of said shaft and having an orifice (52) suitable for allowing the free end of said shaft to pass therethrough, said pump element being characterised in that said mounting means further comprise :
    movable means (54, 64) movable in rotation about the direction of the axis of said shaft relative to said plate, said movable means comprising means for substantially preventing said wheels from moving in translation relative to said plate along the direction of their pivot axes, for holding the pivot axes of said wheels parallel to said axis of the shaft, for allowing each wheel to rotate, and for guiding (62, 66) the axes of said wheels in translation along radial directions;
    whereby, by engaging said tubular duct (22) around the wheels, the side walls of said wheels come into contact towards the axis of rotation of the mounting means in such a manner that a portion of each wheel is disposed facing said orifice; and
    whereby, by pushing down said mounting means into the cavity, the free end of said shaft penetrates through said orifice so that the side wall of the shaft co-operates with said wheels to spread said wheels apart in radial directions away from the axis of the shaft, thereby causing said tubular duct to be locally squeezed.
EP95920136A 1994-05-11 1995-05-11 Peristaltic pump device Expired - Lifetime EP0759124B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9405794A FR2719873A1 (en) 1994-05-11 1994-05-11 Peristaltic pump device.
FR9405794 1994-05-11
PCT/FR1995/000617 WO1995031643A1 (en) 1994-05-11 1995-05-11 Peristaltic pump device

Publications (2)

Publication Number Publication Date
EP0759124A1 EP0759124A1 (en) 1997-02-26
EP0759124B1 true EP0759124B1 (en) 1999-09-08

Family

ID=9463115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95920136A Expired - Lifetime EP0759124B1 (en) 1994-05-11 1995-05-11 Peristaltic pump device

Country Status (8)

Country Link
US (1) US5741125A (en)
EP (1) EP0759124B1 (en)
JP (1) JP3935930B2 (en)
AU (1) AU687207B2 (en)
DE (1) DE69512050T2 (en)
ES (1) ES2136857T3 (en)
FR (1) FR2719873A1 (en)
WO (1) WO1995031643A1 (en)

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Also Published As

Publication number Publication date
AU2570995A (en) 1995-12-05
AU687207B2 (en) 1998-02-19
JP3935930B2 (en) 2007-06-27
WO1995031643A1 (en) 1995-11-23
US5741125A (en) 1998-04-21
JPH10507799A (en) 1998-07-28
DE69512050T2 (en) 2000-03-30
FR2719873A1 (en) 1995-11-17
EP0759124A1 (en) 1997-02-26
DE69512050D1 (en) 1999-10-14
ES2136857T3 (en) 1999-12-01

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