EP0388596A1 - Pump tube for a peristaltic pump - Google Patents

Pump tube for a peristaltic pump Download PDF

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Publication number
EP0388596A1
EP0388596A1 EP90101673A EP90101673A EP0388596A1 EP 0388596 A1 EP0388596 A1 EP 0388596A1 EP 90101673 A EP90101673 A EP 90101673A EP 90101673 A EP90101673 A EP 90101673A EP 0388596 A1 EP0388596 A1 EP 0388596A1
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EP
European Patent Office
Prior art keywords
hose
pump
tube
webs
arcuate sections
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.)
Granted
Application number
EP90101673A
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German (de)
French (fr)
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EP0388596B1 (en
Inventor
Dieter Rath
Friedrich V.D. Haar
Hans Josef Gerlach
Reinhard Knuth
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B Braun Melsungen AG
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B Braun Melsungen AG
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Publication of EP0388596A1 publication Critical patent/EP0388596A1/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
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • F04B43/0072—Special features particularities of the flexible members of tubular flexible members

Definitions

  • the invention relates to a pump hose for a peristaltic pump.
  • peristaltic pumps or peristaltic pumps are used as infusion pumps. Such pumps enable the sterile transport of large quantities of infusion liquid.
  • the interchangeable pump tubing is an inexpensive, disposable product that is supplied in sterile form, can be inserted into the infusion device by the user, and is discarded after use.
  • high demands are placed on the pump hose with regard to flexing ability, elasticity, abrasion resistance and dimensional stability.
  • the delivery volume depends on the cross-sectional dimensions of the pump hose and its resilience.
  • the material used must be physiologically safe, i.e. be inert to the media used. Environmental influences such as temperature, air humidity, light and disinfectants must not influence the material.
  • Pump hoses for peristaltic pumps are usually made from highly elastic material, for example silicone, with high dimensional accuracy.
  • the pump tubing is inserted into the infusions with the help of special connecting pieces, which can also serve as fixing aids line used.
  • the known pump hoses have a round cross section. If a hose with a round cross-section is squeezed by external force, the material stress is uneven, with the kinks of the hose cross-section in particular being heavily stressed. This material load is further increased by the fact that the hose is not only squeezed to such an extent that the two hose wall parts are placed against one another, but also that an additional force is applied to ensure that the hose halves lie flat against each other, so that they can be squeezed securely.
  • a pump hose is known from DE 31 12 837 A1, in which two arcuate sections enclose the hose lumen, so that the hose lumen has the shape of an ellipse. On the sides, webs extend in opposite directions. These webs are used to position the pump hose inside the hose pump. Their thickness is not significantly greater than the wall thickness of the arcuate sections. When the pump hose is pressed together, the pressure rollers only act on the curved sections which are pressed against one another. There is no pressure or support in the area of the webs.
  • US Pat. No. 4,540,350 describes, in addition to various hose shapes, a pump hose which consists of two webs laid flat on top of one another and connected to one another along their edges. This creates side webs, the thickness of which is twice as large as the thickness of an arcuate section, but this hose is preformed to the compressed state. Such a hose has practically no resilience for the suction of liquid. There is also the risk that leaks occur in the area of the interconnected web edges, especially after frequent deformation of the hose.
  • the invention has for its object to provide a pump hose of the type specified in the preamble of claim 1, in which the local material load is reduced during squeezing, so that material damage is avoided and better resetting behavior is achieved.
  • the pump hose according to the invention has a lumen which is delimited by two arcuate sections abutting against one another, with kink lines being formed at the connection points in the hose interior.
  • the tube lumen thus has the cross section of a convex lens. This configuration of the tube walls reduces the force which has to be applied for the occlusive closure of the tube by the peristaltic pump.
  • the material compression is reduced by reducing the kink angle, which corresponds to the tangent angle, and also by the fact that less hose material has to be squeezed along the kink lines.
  • the pump hose is thus preformed in the direction of the intended compression, with the result that the material stresses arising during the squeezing are reduced. This also reduces or eliminates hose abrasion, particularly in the area of the two squeeze lines.
  • a substantial reduction in the material load is achieved in that webs project outwards from the connection points of the arcuate sections, the thickness of which corresponds approximately to the sum of the thicknesses of the two arcuate sections.
  • the invention achieves a reduction in particle abrasion due to the material relief of the pump hose.
  • the service life of the pump tubing is also extended and the constancy of the delivery volume is increased over the infusion time.
  • the webs also improve the lateral stability of the pump hose.
  • the restoring force of the pump hose creates the possibility of sucking in liquid. This requires a high restoring force of the pump hose. If the hydraulic pressure inside the hose is to be measured using a pressure sensor by pressing a pressure sensor against the outer wall of the pump hose, the restoring force of the pump hose falsifies the measured variable. If this restoring force is constant and not too great, it can be taken into account arithmetically and a usable measurement result can be obtained. In order to keep the restoring force in the area of the sensor as low as possible, according to a further embodiment of the invention, the wall thickness is reduced over a length section of the hose compared to the adjacent areas.
  • fixation pieces integrally formed on the pump hose are provided.
  • the pump hose including the fixing pieces is a molded part posed.
  • Such a design as a molded part allows an optimal shaping of the pump area and the pressure measuring zone.
  • Cross-sectional transitions and surface properties can be adapted to the desired flow conditions, ie cross-sectional transitions are carried out fluently and the roughness of the inner surface is chosen so that gas bubble adhesion is minimized.
  • the pump hose according to the invention is particularly suitable for use in a finger pump, in which the hose is arranged linearly and supported on one side, while several fingers act on the hose in succession from the opposite side and continuously squeeze the latter.
  • the pump hose can also be used with other peristaltic pumps, e.g. for roller pumps or swash plate pumps.
  • the hose therefore does not necessarily have to be straight, but it can have a curved course over its length.
  • the pump tube 10 of FIG. 1 has in cross section two arcuate sections 11, 12 which enclose the tube lumen 20 in such a way that the tube lumen has the cross-sectional shape of a convex lens.
  • Longitudinal concave fold lines 14 are formed along the connection points 13 of the arcuate sections 11 and 12. In these kink lines, the tangents to the inner sides of the tube sections 11 and 12 enclose an angle a which is less than 180 ° and is approximately 120 ° in the present exemplary embodiment.
  • the arcuate sections 11 and 12 are circular, the centers of both circles being offset from one another.
  • each web 15 corresponds approximately to the sum of the wall thicknesses of the two arcuate sections 11 and 12.
  • hose cross section is shown in the uncompressed state, that is, in the event that no external or internal forces act on the hose.
  • the tube 10 consists of a physiological harmless elastomer material with high resilience.
  • abutment 16 In the peristaltic pump, which is not shown in the remainder, there is an abutment 16 and a pressure finger 17.
  • the tube initially lies loosely on the abutment 16 with the one curved section 12 and the pressure finger 17 is arranged on the opposite side.
  • the webs 15 run parallel to the end faces of the abutment 16 and the pressure finger 17.
  • Fig. 2 shows the occlusion state of the tube 10, which is squeezed between the pressure finger 17 and the abutment 16.
  • the area of the tube lumen 20 is reduced to zero.
  • the webs prevent the squeezed tube 10 from being additionally squeezed by the pressure finger 17 and they prevent excessive deformation of the tube by a possibly incorrectly set infusion pump because they lie within the width of the abutment 16 and pressure finger 17.
  • the figures 3 to 5 show a pump hose 10 with the cross section explained with reference to FIG. 1.
  • the wall thickness is reduced on a length section 18 which is not exposed to the action of pressure fingers, so that the length section 18 can be used as a pressure measuring zone to which a pressure sensor measuring the internal pressure can be attached from the outside.
  • fixing pieces 19 are provided in the manner of sleeves. These fixing pieces 19 are used to attach and fix the hose in a peristaltic pump in a correct position.
  • the fixing pieces 19 also serve as connecting pieces for connecting infusion lines.
  • the transitions in which the cross section of the tube lumen 20 changes in the longitudinal direction are made continuously or without kinks in order to achieve a flow of fluid that is as laminar as possible.

Abstract

The pump tube (10) for a peristaltic pump consists in the non-deformed state of two arcuate sections (11, 12) which merge into one another along joint lines (14), so that the tube bore (20) has the cross-sectional shape of a convex lens. Adjacent to the joints (13) of the arcuate sections (11, 12) are outwardly pointing webs (15). When the tube (10) is pressed together, only moderate pinching occurs at the joints (13). The tube has a substantially improved pinching and restoring behaviour. The webs (15) prevent overpinching. <IMAGE>

Description

Die Erfindung betrifft einen Pumpenschlauch für eine peristaltische Pumpe.The invention relates to a pump hose for a peristaltic pump.

Im medizinischen Bereich werden Peristaltikpumpen oder Schlauchpumpen als Infusionspumpen verwendet. Solche Pumpen ermöglichen den sterilen Transport von größeren Mengen Infusionsflüssigkeit. Der auswechselbare Pumpen­schlauch stellt ein preiswertes Einmalerzeugnis dar, welches in steriler Form geliefert wird, vom Benutzer in das Infusionsgerät eingesetzt werden kann und nach Gebrauch fortgeworfen wird. Allerdings werden an den Pumpenschlauch hohe Anforderungen bezüglich Walkfähig­keit, Elastizität, Abriebfestigkeit und Maßhaltigkeit gestellt. Das Fördervolumen hängt von den Querschnitts­abmessungen des Pumpenschlauchs ab und von dessen Rück­stellfähigkeit. Weiterhin muß das verwendete Material physiologisch unbedenklich, d.h. gegenüber den ver­wendeten Medien inert sein. Umgebungseinflüsse wie Tem­peratur, Luftfeuchte, Licht und Desinfektionsmittel dürfen das Material nicht beeinflussen.In the medical field, peristaltic pumps or peristaltic pumps are used as infusion pumps. Such pumps enable the sterile transport of large quantities of infusion liquid. The interchangeable pump tubing is an inexpensive, disposable product that is supplied in sterile form, can be inserted into the infusion device by the user, and is discarded after use. However, high demands are placed on the pump hose with regard to flexing ability, elasticity, abrasion resistance and dimensional stability. The delivery volume depends on the cross-sectional dimensions of the pump hose and its resilience. Furthermore, the material used must be physiologically safe, i.e. be inert to the media used. Environmental influences such as temperature, air humidity, light and disinfectants must not influence the material.

Üblicherweise werden Pumpenschläuche für peristaltische Pumpen aus hochelastischem Material, z.B. Silikon, mit hoher Maßhaltigkeit hergestellt. Der Pumpenschlauch wird mit Hilfe spezieller Verbindungsstücke, die zu­gleich als Fixierhilfen dienen können, in die Infusions­ leitung eingesetzt. Die bekannten Pumpenschläuche haben runden Querschnitt. Wenn ein Schlauch mit rundem Quer­schnitt durch äußere Krafteinwirkung gequetscht wird, ergibt sich eine ungleichmäßige Materialbeanspruchung, wobei insbesondere die Knickstellen des Schlauchquer­schnitts stark belastet werden. Verstärkt wird diese Materialbelastung noch dadurch, daß die Abquetschung des Schlauches nicht nur in einem Maße erfolgt, daß die beiden Schlauchwandteile gegeneinandergelegt werden, sondern daß darüber hinaus zur sicheren Abquetschung eine zusätzliche Kraft aufgebracht wird, bei der eine Kompression der flach gegeneinanderliegenden Schlauch­hälften erfolgt. Da eine derartige Abquetschung bei peristaltischen Pumpen mit großer Häufigkeit erfolgt, treten Ermüdungserscheinungen des Schlauchmaterials auf. Außerdem besteht die Gefahr des Abriebs von Schlauchmaterial im Schlauchinnern, wodurch Fremdparti­kel in die Infusionslösung gelangen können. An den beim Abquetschen entstehenden Knickstellen des Schlauch er­gibt sich an der Schlauchinnenseite eine sehr starke Materialquetschung, während an der Außenseite starke Dehnungen entstehen. Außerdem sind die peristaltischen Pumpen Toleranzen unterworfen, durch die das Maß der Schlauchabquetschung variiert. Alle diese Umstände führen dazu, daß das Schlauchvolumen sich während des Betriebs verändert, mit der Folge, daß sich auch die Förderrate bzw. Infusionsrate verändert.Pump hoses for peristaltic pumps are usually made from highly elastic material, for example silicone, with high dimensional accuracy. The pump tubing is inserted into the infusions with the help of special connecting pieces, which can also serve as fixing aids line used. The known pump hoses have a round cross section. If a hose with a round cross-section is squeezed by external force, the material stress is uneven, with the kinks of the hose cross-section in particular being heavily stressed. This material load is further increased by the fact that the hose is not only squeezed to such an extent that the two hose wall parts are placed against one another, but also that an additional force is applied to ensure that the hose halves lie flat against each other, so that they can be squeezed securely. Since such squeezing occurs with high frequency in peristaltic pumps, there are signs of fatigue in the hose material. There is also a risk of abrasion of tubing inside the tubing, which can allow foreign particles to enter the infusion solution. At the kinks in the hose that result from squeezing, there is a very strong material crush on the inside of the hose, while strong strains occur on the outside. In addition, the peristaltic pumps are subject to tolerances that vary the amount of hose squeeze. All of these circumstances mean that the tube volume changes during operation, with the result that the delivery rate or infusion rate also changes.

Ein weiterer Nachteil der bekannten Pumpenschläuche besteht darin, daß die Schlauchwand infolge der ge­forderten hohen Rückstellkraft wenig nachgiebig ist und die Messung des Fluiddrucks mit Hilfe von Drucksenso­ren, die elastisch von außen her gegen die Schlauchwand drücken, erschwert. Nachteilig ist schließlich auch die Notwendigkeit, zusätzliche Fixierhilfen am Pumpen­schlauch anbringen zu müssen.Another disadvantage of the known pump hoses is that the hose wall is not very flexible due to the required high restoring force and makes it difficult to measure the fluid pressure with the aid of pressure sensors which press elastically against the hose wall from the outside. Finally, that is also a disadvantage Need to attach additional fixation aids to the pump hose.

Aus DE 31 12 837 A1 ist ein Pumpenschlauch bekannt, bei dem zwei bogenförmige Abschnitte das Schlauchlumen um­schließen, so daß das Schlauchlumen die Form einer Ellipse hat. Nach den Seiten hin erstrecken sich Stege nach entgegengesetzten Richtungen. Diese Stege dienen der Positionierung des Pumpenschlauchs im Inneren der Schlauchpumpe. Ihre Stärke ist nicht wesentlich größer als die Wandstärke der bogenförmigen Abschnitte. Beim Zusammendrücken des Pumpenschlauchs wirken die Andrück­rollen ausschließlich auf die bogenförmigen Abschnitte ein, die gegeneinandergepreßt werden. Eine Pressung oder Abstützung findet im Bereich der Stege nicht statt.A pump hose is known from DE 31 12 837 A1, in which two arcuate sections enclose the hose lumen, so that the hose lumen has the shape of an ellipse. On the sides, webs extend in opposite directions. These webs are used to position the pump hose inside the hose pump. Their thickness is not significantly greater than the wall thickness of the arcuate sections. When the pump hose is pressed together, the pressure rollers only act on the curved sections which are pressed against one another. There is no pressure or support in the area of the webs.

In US 4 540 350 ist neben verschiedenen Schlauchformen ein Pumpenschlauch beschrieben, der aus zwei flach auf­einandergelegten und entlang ihrer Ränder miteinander verbundenen Bahnen besteht. Dabei entstehen seitliche Stege, deren Stärke doppelt so groß ist wie die Stärke eines bogenförmigen Abschnitts, jedoch ist dieser Schlauch auf den zusammengepreßten Zustand vorgeformt. Ein solcher Schlauch hat praktisch kein Rückstell­vermögen für das Ansaugen von Flüssigkeit. Außerdem besteht die Gefahr, daß im Bereich der miteinander ver­bundenen Bahnränder Undichtigkeiten auftreten, insbe­sondere nach häufiger Verformung des Schlauchs.US Pat. No. 4,540,350 describes, in addition to various hose shapes, a pump hose which consists of two webs laid flat on top of one another and connected to one another along their edges. This creates side webs, the thickness of which is twice as large as the thickness of an arcuate section, but this hose is preformed to the compressed state. Such a hose has practically no resilience for the suction of liquid. There is also the risk that leaks occur in the area of the interconnected web edges, especially after frequent deformation of the hose.

Der Erfindung liegt die Aufgabe zugrunde, einen Pumpen­schlauch der im Oberbegriff des Patentanspruchs 1 an­gegebenen Art zu schaffen, bei dem die örtliche Mate­rialbelastung während des Abquetschens verringert ist, so daß Materialschädigungen vermieden werden und ein besseres Rückstellverhalten erreicht wird.The invention has for its object to provide a pump hose of the type specified in the preamble of claim 1, in which the local material load is reduced during squeezing, so that material damage is avoided and better resetting behavior is achieved.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäß mit den im Patentanspruch 1 angegebenen Merkmalen.This object is achieved according to the invention with the features specified in claim 1.

Der erfindungsgemäße Pumpenschlauch hat ein Lumen, das aus zwei gegeneinanderstoßenden bogenförmigen Ab­schnitten begrenzt wird, wobei an den Verbindungs­stellen im Schlauchinnern Knicklinien gebildet sind. Das Schlauchlumen hat somit den Querschnitt einer konvexen Linse. Durch diese Ausgestaltung der Schlauch­wände wird die Kraft, welche zum okklusiven Verschluß des Schlauches durch die Peristaltikpumpe aufzuwenden ist, verringert.The pump hose according to the invention has a lumen which is delimited by two arcuate sections abutting against one another, with kink lines being formed at the connection points in the hose interior. The tube lumen thus has the cross section of a convex lens. This configuration of the tube walls reduces the force which has to be applied for the occlusive closure of the tube by the peristaltic pump.

Die Materialstauchung verringert sich durch Verkleine­rung des Knickwinkels, der dem Tangentenwinkel ent­spricht, und ferner dadurch, daß entlang der Knick­linien weniger Schlauchmaterial gequetscht werden muß. Der Pumpenschlauch ist somit in Richtung auf die be­absichtigte Zusammendrückung vorgeformt, mit der Folge, daß die beim Abquetschen entstehenden Materialbe­anspruchungen verringert sind. Dadurch wird auch der Schlauchabrieb, insbesondere im Bereich der beiden Quetschlinien, verringert oder beseitigt.The material compression is reduced by reducing the kink angle, which corresponds to the tangent angle, and also by the fact that less hose material has to be squeezed along the kink lines. The pump hose is thus preformed in the direction of the intended compression, with the result that the material stresses arising during the squeezing are reduced. This also reduces or eliminates hose abrasion, particularly in the area of the two squeeze lines.

Eine wesentliche Verminderung der Materialbelastung wird dadurch erreicht, daß von den Verbindungsstellen der bogenförmigen Abschnitte Stege nach außen abstehen, deren Stärke etwa der Summe der Stärken der beiden bogenförmigen Abschnitte entspricht. Dadurch wird ein Teil der von außen her auf den Schlauch einwirkenden Okklusionskraft, mit der die gegeneinanderliegenden bogenförmigen Schlauchabschnitte noch zusätzlich ge­quetscht werden, von den Stegen aufgenommen. Auf diese Weise können Toleranzen des Infusionsgerätes bei der Bemessung der auf den Schlauch einwirkenden Kraft eli­miniert werden.A substantial reduction in the material load is achieved in that webs project outwards from the connection points of the arcuate sections, the thickness of which corresponds approximately to the sum of the thicknesses of the two arcuate sections. As a result, part of the occlusal force acting on the tube from the outside, with which the opposing one curved tube sections are additionally squeezed by the webs. In this way, tolerances of the infusion device when dimensioning the force acting on the hose can be eliminated.

Durch die Erfindung wird infolge der Materialentlastung des Pumpenschlauches eine Reduzierung des Partikel­abriebs erreicht. Ferner wird die Standzeit des Pumpen­schlauchs verlängert und die Konstanz des Förder­volumens über die Infusionszeit erhöht. Die Stege be­wirken auch eine Verbesserung der Seitenstabilität des Pumpenschlauchs.The invention achieves a reduction in particle abrasion due to the material relief of the pump hose. The service life of the pump tubing is also extended and the constancy of the delivery volume is increased over the infusion time. The webs also improve the lateral stability of the pump hose.

Die Rückstellkraft des Pumpenschlauchs schafft die Mög­lichkeit Flüssigkeit anzusaugen. Hierzu ist eine hohe Rückstellkraft des Pumpenschlauchs notwendig. Wenn mittels eines Drucksensors der hydraulische Druck im Schlauchinnern gemessen werden soll, indem ein Druck­fühler gegen die Außenwand des Pumpenschlauchs drückt, verfälscht die Rückstellkraft des Pumpenschlauchs die Meßgröße. Ist diese Rückstellkraft konstant und nicht zu groß, so kann man sie rechnerisch berücksichtigen und ein brauchbares Meßergebnis erhalten. Um die Rück­stellkraft im Bereich des Meßwertaufnehmers möglichst gering zu halten, ist gemäß einer weiteren Ausgestal­tung der Erfindung auf einem Längenabschnitt des Schlauches die Wandstärke gegenüber den angrenzenden Bereichen verringert.The restoring force of the pump hose creates the possibility of sucking in liquid. This requires a high restoring force of the pump hose. If the hydraulic pressure inside the hose is to be measured using a pressure sensor by pressing a pressure sensor against the outer wall of the pump hose, the restoring force of the pump hose falsifies the measured variable. If this restoring force is constant and not too great, it can be taken into account arithmetically and a usable measurement result can be obtained. In order to keep the restoring force in the area of the sensor as low as possible, according to a further embodiment of the invention, the wall thickness is reduced over a length section of the hose compared to the adjacent areas.

Gemäß einer bevorzugten Weiterbildung der Erfindung sind an dem Pumpenschlauch einstückig angeformte Fixierstücke vorgesehen. Der Pumpenschlauch ein­schließlich der Fixierstücke ist als Formteil her­ gestellt. Eine solche Gestaltung als Formteil erlaubt eine optimale Formgebung des Pumpbereichs und der Druckmeßzone. Querschnittsübergänge und Oberflächen­beschaffenheit können den gewünschten Strömungsbedin­gungen angepaßt werden, d.h. Querschnittsübergänge werden fließend ausgeführt und die Rauhheit der Innen­fläche wird so gewählt, daß eine Gasblasenhaftung minimiert wird.According to a preferred development of the invention, fixation pieces integrally formed on the pump hose are provided. The pump hose including the fixing pieces is a molded part posed. Such a design as a molded part allows an optimal shaping of the pump area and the pressure measuring zone. Cross-sectional transitions and surface properties can be adapted to the desired flow conditions, ie cross-sectional transitions are carried out fluently and the roughness of the inner surface is chosen so that gas bubble adhesion is minimized.

Der erfindungsgemäße Pumpenschlauch eignet sich ins­besondere für den Einsatz in einer Fingerpumpe, bei der der Schlauch linear angeordnet und an einer Seite ab­gestützt wird, während von der gegenüberliegenden Seite her mehrere Finger nacheinander auf den Schlauch ein­wirken und diesen fortlaufend abquetschen. Der Pumpen­schlauch ist aber auch bei anderen peristaltischen Pumpen einsetzbar, z.B. bei Rollenpumpen oder Taumel­scheibenpumpen. Der Schlauch muß daher nicht not­wendigerweise geradlinig sein, sondern er kann über seine Länge einen gekrümmten Verlauf haben.The pump hose according to the invention is particularly suitable for use in a finger pump, in which the hose is arranged linearly and supported on one side, while several fingers act on the hose in succession from the opposite side and continuously squeeze the latter. The pump hose can also be used with other peristaltic pumps, e.g. for roller pumps or swash plate pumps. The hose therefore does not necessarily have to be straight, but it can have a curved course over its length.

Im folgenden werden unter Bezugnahme auf die Zeich­nungen Ausführungsbeispiele der Erfindung näher er­läutert.Exemplary embodiments of the invention are explained in more detail below with reference to the drawings.

Es zeigen:

  • Fig. 1 eine Darstellung des noch unkomprimierten Schlauchquerschnitts zwischen einem Widerlager und einem Pumpenfinger,
  • Fig. 2 die Einrichtung von Fig. 1 bei zusammen­gequetschtem Schlauch,
  • Fig. 3 einen Längsschnitt durch einen Pumpenschlauch,
  • Fig. 4 einen Schnitt entlang der Linie IV-IV von Fig. 3, und
  • Fig. 5 in vergrößertem Maßstab eine Einzelheit V aus Fig. 3.
Show it:
  • 1 is a representation of the still uncompressed hose cross section between an abutment and a pump finger,
  • 2 shows the device of FIG. 1 with the tube squeezed together,
  • 3 shows a longitudinal section through a pump hose,
  • Fig. 4 is a section along the line IV-IV of Fig. 3, and
  • 5 shows a detail V from FIG. 3 on an enlarged scale.

Der Pumpenschlauch 10 von Fig. 1 weist im Querschnitt zwei bogenförmige Abschnitte 11,12 auf, die das Schlauchlumen 20 derart umschließen, daß das Schlauch­lumen die Querschnittsform einer konvexen Linse hat. Entlang der Verbindungsstellen 13 der bogenförmigen Abschnitte 11 und 12 sind längslaufende konkave Knick­linien 14 gebildet. In diesen Knicklinien schließen die Tangenten an die Innenseiten der Schlauchabschnitte 11 und 12 einen Winkel a ein, der kleiner ist als 180° und bei dem vorliegenden Ausführungsbeispiel etwa 120° be­trägt.The pump tube 10 of FIG. 1 has in cross section two arcuate sections 11, 12 which enclose the tube lumen 20 in such a way that the tube lumen has the cross-sectional shape of a convex lens. Longitudinal concave fold lines 14 are formed along the connection points 13 of the arcuate sections 11 and 12. In these kink lines, the tangents to the inner sides of the tube sections 11 and 12 enclose an angle a which is less than 180 ° and is approximately 120 ° in the present exemplary embodiment.

Die bogenförmigen Abschnitte 11 und 12 sind kreis­förmig, wobei die Mittelpunkte beider Kreise gegen­einander versetzt sind.The arcuate sections 11 and 12 are circular, the centers of both circles being offset from one another.

An die Verbindungsstellen 13 der Schlauchabschnitte 11 und 12 schließen sich nach außen weisende Stege 15 an. Die Stärke eines jeden Steges 15 entspricht etwa der Summe der Wandstärken der beiden bogenförmigen Ab­schnitte 11 und 12.At the connection points 13 of the hose sections 11 and 12, outwardly facing webs 15 adjoin. The thickness of each web 15 corresponds approximately to the sum of the wall thicknesses of the two arcuate sections 11 and 12.

In Fig. 1 ist der Schlauchquerschnitt im unkompri­mierten Zustand dargestellt, also in dem Fall, daß keine äußeren oder inneren Kräfte auf den Schlauch ein­wirken. Der Schlauch 10 besteht aus einem physiologisch unbedenklichen Elastomermaterial von hoher Rückstell­fähigkeit.In Fig. 1 the hose cross section is shown in the uncompressed state, that is, in the event that no external or internal forces act on the hose. The tube 10 consists of a physiological harmless elastomer material with high resilience.

In der peristaltischen Pumpen, die im übrigen nicht dargestellt ist, befindet sich ein Widerlager 16 und ein Druckfinger 17. Der Schlauch liegt mit dem einen bogenförmigen Abschnitt 12 zunächst lose am Widerlager 16 an und der Druckfinger 17 ist auf der gegenüber­liegenden Seite angeordnet. Die Stege 15 verlaufen parallel zu den Stirnseiten von Widerlager 16 und Druckfinger 17.In the peristaltic pump, which is not shown in the remainder, there is an abutment 16 and a pressure finger 17. The tube initially lies loosely on the abutment 16 with the one curved section 12 and the pressure finger 17 is arranged on the opposite side. The webs 15 run parallel to the end faces of the abutment 16 and the pressure finger 17.

Fig. 2 zeigt den Okklusionszustand des Schlauches 10, der zwischen dem Druckfinger 17 und dem Widerlager 16 zusammengequetscht ist. Dabei ist die Fläche des Schlauchlumens 20 auf Null reduziert. Im Bereich der Verbindungsstellen 13 der ursprünglich bogenförmigen Abschnitte 11 und 12 ergeben sich keine wesentlich höheren Materialquetschungen als in den übrigen Be­reichen. Die Stege verhindern, daß der abgequetschte Schlauch 10 von dem Druckfinger 17 noch zusätzlich zu­sammengequetscht wird und sie verhindern eine über­mäßige Deformierung des Schlauches durch eine eventuell fehlerhaft eingestellte Infusionspumpe, weil sie inner­halb der Breite von Widerlager 16 und Druckfinger 17 liegen.Fig. 2 shows the occlusion state of the tube 10, which is squeezed between the pressure finger 17 and the abutment 16. The area of the tube lumen 20 is reduced to zero. In the area of the connection points 13 of the originally arcuate sections 11 and 12 there are no significantly higher crushes than in the other areas. The webs prevent the squeezed tube 10 from being additionally squeezed by the pressure finger 17 and they prevent excessive deformation of the tube by a possibly incorrectly set infusion pump because they lie within the width of the abutment 16 and pressure finger 17.

Die Fign. 3 bis 5 zeigen einen Pumpenschlauch 10 mit dem anhand von Fig. 1 erläuterten Querschnitt. Auf einem Längenabschnitt 18, der nicht der Einwirkung von Druckfingern ausgesetzt ist, ist die Wandstärke redu­ziert, so daß der Längenabschnitt 18 als Druckmeßzone benutzt werden kann, an die ein den Innendruck messen­der Drucksensor von außen angesetzt werden kann.The figures 3 to 5 show a pump hose 10 with the cross section explained with reference to FIG. 1. The wall thickness is reduced on a length section 18 which is not exposed to the action of pressure fingers, so that the length section 18 can be used as a pressure measuring zone to which a pressure sensor measuring the internal pressure can be attached from the outside.

An den Schlauchenden sind einstückig angeformte Fixier­stücke 19 nach Art von Muffen vorgesehen. Diese Fixier­stücke 19 dienen der Anbringung und lagegerechten Fixierung des Schlauches in einer peristaltischen Pumpe. Die Fixierstücke 19 dienen zugleich als An­schlußstücke für den Anschluß von Infusionsleitungen.At the hose ends integrally formed fixing pieces 19 are provided in the manner of sleeves. These fixing pieces 19 are used to attach and fix the hose in a peristaltic pump in a correct position. The fixing pieces 19 also serve as connecting pieces for connecting infusion lines.

Wie Fig. 5 zeigt, sind die Übergänge, in denen sich der Querschnitt des Schlauchlumens 20 in Längsrichtung ver­ändert, stetig bzw. knickfrei ausgeführt, um eine mög­lichst laminare Fluidströmung zu erreichen.As FIG. 5 shows, the transitions in which the cross section of the tube lumen 20 changes in the longitudinal direction are made continuously or without kinks in order to achieve a flow of fluid that is as laminar as possible.

Claims (5)

1. Pumpenschlauch für eine peristaltische Pumpe, wo­bei die das Schlauchlumen (20) des unverformten Schlauches umschließenden einstückige Schlauchwand aus zwei vorzugsweise symmetrischen bogenförmigen Abschnitten (11,12) besteht, die an ihren Verbin­dungsstellen (13) Tangenten haben, welche einen Öffnungswinkel (a) des Schlauches von weniger als 180° einschließen, und wobei von den Verbindungs­stellen (13) Stege (15) nach außen abstehen,
dadurch gekennzeichnet,
daß die Stärke der Stege (15) etwa der Summe der Stärken der beiden bogenförmigen Abschnitte (11,12) entspricht.1. Pump hose for a peristaltic pump, the one-piece hose wall surrounding the hose lumen (20) of the undeformed hose consisting of two preferably symmetrical arcuate sections (11, 12) which have tangents at their connecting points (13), which have an opening angle (a) enclose the hose by less than 180 °, and webs (15) project outwards from the connection points (13),
characterized,
that the thickness of the webs (15) corresponds approximately to the sum of the thicknesses of the two arcuate sections (11, 12). 2. Pumpenschlauch nach Anspruch 1, dadurch gekenn­zeichnet, daß der Öffnungswinkel (a) weniger als 150° und vorzugsweise etwa 120° beträgt.2. Pump hose according to claim 1, characterized in that the opening angle (a) is less than 150 ° and preferably about 120 °. 3. Pumpenschlauch nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß auf einem Längenabschnitt (18) des Schlauches die Wandstärke gegenüber den an­grenzenden Bereichen verringert ist.3. Pump hose according to claim 1 or 2, characterized in that the wall thickness is reduced compared to the adjacent areas on a length section (18) of the hose. 4. Pumpenschlauch nach einem der Ansprüche 1 bis 3, gekennzeichnet durch einstückig angeformte Fixier­stücke (19).4. Pump hose according to one of claims 1 to 3, characterized by integrally molded fixing pieces (19). 5. Pumpenschlauch nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß Querschnittsverände­rungen des Schlauchlumens (20) in Längsrichtung stetig und knickfrei ausgeführt sind.5. Pump hose according to one of claims 1 to 4, characterized in that cross-sectional changes of the hose lumen (20) in the longitudinal direction are carried out continuously and without kinks.
EP90101673A 1989-03-23 1990-01-28 Pump tube for a peristaltic pump Expired - Lifetime EP0388596B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909657 1989-03-23
DE3909657A DE3909657A1 (en) 1989-03-23 1989-03-23 PUMP HOSE FOR A PERISTALTIC PUMP

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EP0388596A1 true EP0388596A1 (en) 1990-09-26
EP0388596B1 EP0388596B1 (en) 1993-08-04

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ID=6377101

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EP90101673A Expired - Lifetime EP0388596B1 (en) 1989-03-23 1990-01-28 Pump tube for a peristaltic pump

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US (1) US5088522A (en)
EP (1) EP0388596B1 (en)
JP (1) JPH0315682A (en)
AT (1) ATE92592T1 (en)
DE (2) DE3909657A1 (en)
DK (1) DK0388596T3 (en)
ES (1) ES2042086T3 (en)

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WO1996036812A1 (en) * 1995-05-15 1996-11-21 Volker Von Hertel Process, peristaltic pump and hose for delivering a fluid
US5658133A (en) * 1994-03-09 1997-08-19 Baxter International Inc. Pump chamber back pressure dissipation apparatus and method
WO1999011932A1 (en) * 1997-09-04 1999-03-11 Baxter International Inc. Improved accuracy peristaltic pump
EP2592270A1 (en) * 2011-11-11 2013-05-15 Connectors Verbindungstechnik AG Pump hose for a peristaltic pump
WO2016030868A2 (en) 2014-08-29 2016-03-03 Leo Bühler Elastic pump for a peristaltic pump, peristaltic pump for guiding flowable masses or powder, portioning unit for portioning flowable masses or powder, arrangement comprising several portioning units of said type, method for portioning flowable masses or powder
CN106704158A (en) * 2017-01-17 2017-05-24 无锡市天利流体科技有限公司 High-dose pump
US10563646B2 (en) 2004-09-06 2020-02-18 Gambro Lundia Ab Peristaltic pump tube

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Publication number Priority date Publication date Assignee Title
US5482446A (en) * 1994-03-09 1996-01-09 Baxter International Inc. Ambulatory infusion pump
US5658133A (en) * 1994-03-09 1997-08-19 Baxter International Inc. Pump chamber back pressure dissipation apparatus and method
WO1996036812A1 (en) * 1995-05-15 1996-11-21 Volker Von Hertel Process, peristaltic pump and hose for delivering a fluid
WO1999011932A1 (en) * 1997-09-04 1999-03-11 Baxter International Inc. Improved accuracy peristaltic pump
US10563646B2 (en) 2004-09-06 2020-02-18 Gambro Lundia Ab Peristaltic pump tube
EP1787024B2 (en) † 2004-09-06 2021-06-16 Gambro Lundia AB Peristaltic pump tube
US11060516B2 (en) 2004-09-06 2021-07-13 Gambro Lundia Ab Peristaltic pump tube
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US9086178B2 (en) 2011-11-11 2015-07-21 Connectors Verbindungstechnik Ag Pump hose for a peristaltic pump
WO2016030868A2 (en) 2014-08-29 2016-03-03 Leo Bühler Elastic pump for a peristaltic pump, peristaltic pump for guiding flowable masses or powder, portioning unit for portioning flowable masses or powder, arrangement comprising several portioning units of said type, method for portioning flowable masses or powder
CN106704158A (en) * 2017-01-17 2017-05-24 无锡市天利流体科技有限公司 High-dose pump

Also Published As

Publication number Publication date
JPH0315682A (en) 1991-01-24
EP0388596B1 (en) 1993-08-04
ATE92592T1 (en) 1993-08-15
DK0388596T3 (en) 1993-10-04
DE59002141D1 (en) 1993-09-09
ES2042086T3 (en) 1993-12-01
US5088522A (en) 1992-02-18
DE3909657A1 (en) 1990-09-27

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