EP0388596B1 - Pumpenschlauch für eine peristaltische Pumpe - Google Patents

Pumpenschlauch für eine peristaltische Pumpe 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
Authority
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
Application number
EP90101673A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0388596A1 (de
Inventor
Dieter Rath
Friedrich V.D. Haar
Hans Josef Gerlach
Reinhard Knuth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
B Braun Melsungen AG
Original Assignee
B Braun Melsungen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by B Braun Melsungen AG filed Critical B Braun Melsungen AG
Publication of EP0388596A1 publication Critical patent/EP0388596A1/de
Application granted granted Critical
Publication of EP0388596B1 publication Critical patent/EP0388596B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
EP90101673A 1989-03-23 1990-01-28 Pumpenschlauch für eine peristaltische Pumpe Expired - Lifetime EP0388596B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909657A DE3909657A1 (de) 1989-03-23 1989-03-23 Pumpenschlauch fuer eine peristaltische pumpe
DE3909657 1989-03-23

Publications (2)

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

Family

ID=6377101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101673A Expired - Lifetime EP0388596B1 (de) 1989-03-23 1990-01-28 Pumpenschlauch für eine peristaltische Pumpe

Country Status (7)

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

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DE4126089A1 (de) * 1991-08-07 1993-02-11 Braun Melsungen Ag Pumpenschlauch fuer eine peristaltische pumpe
DE4126087A1 (de) * 1991-08-07 1993-02-11 Braun Melsungen Ag Pumpenschlauch fuer eine peristaltische pumpe
DE4222501C1 (ja) * 1992-07-09 1993-07-01 B. Braun Melsungen Ag, 3508 Melsungen, De
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US7722338B2 (en) * 2005-02-10 2010-05-25 Novasys Medical, Inc. Peristaltic pump providing simplified loading and improved tubing kink resistance
EP1954945B1 (en) 2005-12-01 2010-04-14 Michigan Critical Care Consultants, Inc. Pulsatile rotary ventricular pump
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US20090053084A1 (en) * 2007-08-21 2009-02-26 Klein Jeffrey A Roller pump and peristaltic tubing with atrium
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US8118572B2 (en) * 2009-02-09 2012-02-21 Klein Jeffrey A Peristaltic pump tubing with stopper and cooperative roller assembly housing having no moving parts
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DE102014217358A1 (de) 2014-08-29 2016-03-03 Leo Bühler Portioniereinheit zum Portionieren von fliessfähigen Massen oder Pulver, Anordnung mit mehreren solchen Portioniereinheiten sowie Verfahren zum Portionieren von fliessfähigen Massen oder Pulver
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CN106704158A (zh) * 2017-01-17 2017-05-24 无锡市天利流体科技有限公司 一种高剂量泵
EP3720522B1 (en) 2017-12-08 2023-06-07 AMF Medical SA Drug delivery device
CN110360086B (zh) * 2018-12-26 2024-03-19 保定雷弗流体科技有限公司 蠕动泵泵头弹性软管挤压部件、卡片、滚轮及蠕动泵泵头
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US11241530B1 (en) 2020-11-23 2022-02-08 Amf Medical Sa Insulin patch pump having photoplethysmography module
CN112915310A (zh) * 2021-01-26 2021-06-08 浙江清华柔性电子技术研究院 体内植入式蠕动泵、蠕动泵控制器及体液转运系统
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US11857757B2 (en) 2021-06-01 2024-01-02 Tandem Diabetes Care Switzerland Sàrl Systems and methods for delivering microdoses of medication
US11712514B2 (en) 2021-06-01 2023-08-01 Tandem Diabetes Care Switzerland Sàrl Cannulas for systems and methods for delivering microdoses of medication
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Also Published As

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

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