EP0388596B1 - Pump tube for a peristaltic pump - Google Patents

Pump tube for a peristaltic pump Download PDF

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Publication number
EP0388596B1
EP0388596B1 EP90101673A EP90101673A EP0388596B1 EP 0388596 B1 EP0388596 B1 EP 0388596B1 EP 90101673 A EP90101673 A EP 90101673A EP 90101673 A EP90101673 A EP 90101673A EP 0388596 B1 EP0388596 B1 EP 0388596B1
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EP
European Patent Office
Prior art keywords
hose
pump
tube
set forth
webs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP90101673A
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German (de)
French (fr)
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EP0388596A1 (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 hose is inserted into the infusion line with the help of special connectors, which can also serve as fixing aids used.
  • the known pump hoses have a round cross section. If a hose with a round cross-section is squeezed by external force, there is an uneven material load, in particular the kinks of the hose cross-section being heavily loaded. This material loading is further increased by the fact that the hose is not squeezed to such an extent that the two hose wall parts are placed against one another, but that an additional force is applied to ensure that the hose halves are compressed flat so that they can be squeezed.
  • 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.
  • a pump hose in which beads are arranged on opposite sides is known from US 2 917 002.
  • This pump hose consists of a relatively thick-walled elastomer material which has a dovetail-shaped web for anchoring in a base.
  • the beads prevent excessive wear on those wall locations where the hose is thin.
  • the thickness of these beads is less than twice the wall thickness of the hose.
  • 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 sucking in liquid. There is also the risk that leaks occur in the area of the interconnected web edges, especially after frequent deformation of the hose.
  • a pump hose is also known from US Pat. No. 3,176,622, in which the hose material lies twice along the side edges, whereby lateral webs are created, the thickness of which is twice as great as the wall thickness.
  • the two halves of the hose cross-section have molded retaining strips made of fiber-reinforced elastomer material.
  • One holding bar is used for anchoring in the housing of the hose pump and the other holding bar transmits tensile and compressive forces in order to pull the hose apart in those areas in which it is not squeezed together.
  • the hose In the original state, the hose has a relatively flat opening cross section. Both the squeezing and the pulling apart of the hose is done by external force.
  • 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 manufactured as a molded part.
  • 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 smoothly and the roughness of the inner surface is selected 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.

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

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 Infusionsleitung 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 hose is inserted into the infusion line with the help of special connectors, which can also serve as fixing aids used. The known pump hoses have a round cross section. If a hose with a round cross-section is squeezed by external force, there is an uneven material load, in particular the kinks of the hose cross-section being heavily loaded. This material loading is further increased by the fact that the hose is not squeezed to such an extent that the two hose wall parts are placed against one another, but that an additional force is applied to ensure that the hose halves are compressed flat so that they can be squeezed. 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 that 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.

Ein Pumpenschlauch, bei dem an entgegengesetzten Seiten Wülste angeordnet sind, ist bekannt aus US 2 917 002. Dieser Pumpenschlauch besteht aus einem relativ dickwandigen Elastomermaterial, das einen schwalbenschwanzförmigen Steg zur Verankerung in einer Unterlage aufweist. Die Wülste verhindern eine übermäßige Abnutzung an denjenigen Wandstellen, an denen der Schlauch dünn ist. Die Dicke dieser Wülste ist kleiner als die zweifache Wandstärke des Schlauchs.A pump hose in which beads are arranged on opposite sides is known from US 2 917 002. This pump hose consists of a relatively thick-walled elastomer material which has a dovetail-shaped web for anchoring in a base. The beads prevent excessive wear on those wall locations where the hose is thin. The thickness of these beads is less than twice the wall thickness of the hose.

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 sucking in liquid. There is also the risk that leaks occur in the area of the interconnected web edges, especially after frequent deformation of the hose.

Aus US 3 176 622 ist ebenfalls ein Pumpenschlauch bekannt, bei dem längs der Seitenränder das Schlauchmaterial doppelt liegt, wodurch seitliche Stege entstehen, deren Stärke doppelt so groß ist wie die Wandstärke. Die beiden Hälften des Schlauchquerschnitts haben angeformte Halteleisten aus faserverstärktem Elastomermaterial. Die eine Halteleiste dient der Verankerung im Gehäuse der Schlauchpumpe und die andere Halteleiste überträgt Zug- und Druckkräfte, um den Schlauch in denjenigen Bereichen, in denen er nicht zusammengequetscht wird, auseinanderzuziehen. Im Ursprungszustand hat der Schlauch einen relativ flachen Öffnungsquerschnitt. Sowohl das Zusammenquetschen als auch das Auseinanderziehen des Schlauchs erfolgt durch äußere Zwangseinwirkung.A pump hose is also known from US Pat. No. 3,176,622, in which the hose material lies twice along the side edges, whereby lateral webs are created, the thickness of which is twice as great as the wall thickness. The two halves of the hose cross-section have molded retaining strips made of fiber-reinforced elastomer material. One holding bar is used for anchoring in the housing of the hose pump and the other holding bar transmits tensile and compressive forces in order to pull the hose apart in those areas in which it is not squeezed together. In the original state, the hose has a relatively flat opening cross section. Both the squeezing and the pulling apart of the hose is done by external force.

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 hergestellt. 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 manufactured as a molded part. 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 smoothly and the roughness of the inner surface is selected 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:
Fig. 1
a representation of the still uncompressed hose cross-section between an abutment and a pump finger,
Fig. 2
1 with the tube squeezed together,
Fig. 3
a longitudinal section through a pump hose,
Fig. 4
a section along the line IV-IV of Fig. 3, and
Fig. 5
on a larger scale, a detail V from FIG. 3.

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. A pump hose for a peristaltic pump with the ability to resiliently return into the undeformed state for aspirating, the integral hose wall enclosing the hose lumen (20) of the undeformed hose being lens-shaped and consisting of two preferably symmetric arcuate portions (11,12) that have tangential lines at their joinings (13) which enclose an opening angle (a) of the hose that is less than 150°, and ribs (15) protruding outward from the joinings (13),
    characterised in
    that the thickness of the ribs (15) approximately corresponds to the sum of the thicknesses of the two arcuate portions (11,12).
  2. The pump hose as set forth in claim 1, characterised in that the opening angle (a) is about 120°.
  3. The pump hose as set forth in claim 1 or 2, characterised in that the wall thickness of a portion (18) of the hose length is reduced with respect to the adjacent portions.
  4. The pump hose as set forth in one of claims 1 to 3, characterised by integrally formed fastening members (19).
  5. The pump hose as set forth in one of claims 1 to 4, characterised in that changes in the cross section of the hose lumen (20) are configured continuous and kink-free in the longitudinal direction.
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

Publications (2)

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

Family

ID=6377101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101673A Expired - Lifetime EP0388596B1 (en) 1989-03-23 1990-01-28 Pump tube for a peristaltic pump

Country Status (7)

Country Link
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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Also Published As

Publication number Publication date
EP0388596A1 (en) 1990-09-26
JPH0315682A (en) 1991-01-24
DE59002141D1 (en) 1993-09-09
DE3909657A1 (en) 1990-09-27
US5088522A (en) 1992-02-18
ATE92592T1 (en) 1993-08-15
DK0388596T3 (en) 1993-10-04
ES2042086T3 (en) 1993-12-01

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