EP0344640A1 - Peristaltic pump provided with means to contain and guide the flexible suction and delivery pipe within its seat - Google Patents

Peristaltic pump provided with means to contain and guide the flexible suction and delivery pipe within its seat Download PDF

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Publication number
EP0344640A1
EP0344640A1 EP89109535A EP89109535A EP0344640A1 EP 0344640 A1 EP0344640 A1 EP 0344640A1 EP 89109535 A EP89109535 A EP 89109535A EP 89109535 A EP89109535 A EP 89109535A EP 0344640 A1 EP0344640 A1 EP 0344640A1
Authority
EP
European Patent Office
Prior art keywords
seat
peristaltic pump
pipe
flexible pipe
projections
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.)
Withdrawn
Application number
EP89109535A
Other languages
German (de)
English (en)
French (fr)
Inventor
Giuseppe Valisi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0344640A1 publication Critical patent/EP0344640A1/en
Withdrawn legal-status Critical Current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
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing

Definitions

  • the object of the present invention is a pump of the type commonly defined as peristaltic pump.
  • Pumps of this type are described for example in US-A-2,693,765 and in FR-A-2 262 209. They essentially comprise a flexible pipe - for instance of rubber, eventually reinforced with fabric or harmonic steel - positioned inside the pump along a U path, the saddle of the U being formed by a substantially semicylindrical seat.
  • the flexible pipe is pressed against said seat by pressure rollers carried at the periphery of a rotor, which rotates within the saddle of the U on a shaft coaxial to said semicylindrical seat.
  • the pressure rollers bear onto said surface to an extent such as to squash the pipe against the respective seat to the point that the inner space of the pipe closes up completely.
  • the direction of rotation of the rotor is such that the pipe zone which closes up under the pressure of the roller moves from the suction end towards the delivery end of the pipe itself, thereby allowing the liquid to flow through the pipe.
  • the flexible pipe keeps its elastic properties unaltered and reacts in a perfectly balanced manner to the squashing action of the pressure roller, taking up a perfectly symmetrical configuration between the flat sidewalls defining the semicylindrical seat into which it is housed. Nevertheless, after a certain period of use of the pump, the flexible pipe gradually wears out, looses its initial characteristics of stiffness and, under the squashing action of the pressure roller, it reacts in a non-balanced manner and is inclined to slip sideways into the gaps existing between the sidewalls of the semicylindrical seat and the pressure roller itself.
  • Said behaviour of the pipe is particularly harmful because, as well as notably accelerating the wear of the pipe itself, it simultaneously reduces the efficiency of the pump, due to the fact that the inner space of the pipe does not close up completely as the pressure roller rolls onto the same.
  • the flexible pipe has to be replaced after a fairly short period of use and, in any case, when its sealing properties would still allow a protracted use thereof.
  • the object of the present invention is therefore to obtain a peristaltic pump in which there is no longer the risk that the flexible pipe may move out of the respective seat or may anyhow perform movements apt to alter its symmetrical configuration under the squashing action of the pressure roller.
  • said object is reached by providing the sidewalls defining the semicylindrical seat housing the flexible pipe with half-annular projections, concentric to and having a smaller diameter than said seat, so as to form a continuous rim to contain and guide the flexible pipe both when it is free and when it is squashed by the pressure rollers.
  • the peristaltic pump comprises a base 1, to which there is fixedly connected a cylindrical casing 2 into which rotates a rotor 3, the rotor shaft being coaxial to the cylindrical casing 2.
  • a semicylindrical seat 2a is moreover formed into the inner part of the casing 2, onto which seat bears the flexible pipe 4.
  • the pipe 4 is positioned along a U path, the saddle of the U being formed by said semicylindrical seat 2a; the end parts, forming the branches of the U, extend instead outwardly of the casing 2, into A and M, so as to be respectively connected to the suction and delivery pipes.
  • the pressure rollers 7 and 8 are mounted idle on the respective pins in diametrally opposite positions of the rotor 3. According to the known technique of construction of this type of peristaltic pumps, the periphery of the pressure rollers 7, 8, projects outwardly of the rotor 3, so as to forcefully compress the flexible pipe 4 against the respective seat 2a, in the manner clearly shown in fig. 1 and in the top part of figs. 2 and 3.
  • the present invention therefore proposes to provide on both side­walls of the seat 2a a pair of opposed half-annular projections 5 and 6, concentric to the semicylindrical seat 2a and having a smaller diameter than the same.
  • the projections 5, 6, have a transversal dimension sufficient to reduce to a very modest value the gap between them and the pressure rollers 7, 8; furthermore, thanks to their particular configura­tion, they form elements to contain and guide the pipe 4 in rest conditions, during the initial squashing step, and during the final total compression.
  • the projections 5, 6, preferably have a trapezoidal cross section, with an oblique side 5a, 6a, facing the semicylindrical seat 2a.
  • the inclination angle - indicated in fig. 2 by reference X - of the oblique sides 5a, 6a, in respect of a plane perpendicular to the axis of the rotor 3, is preferably included between 20° and 45°, while the diameter of the half-annular projections 5 and 6 is such that the distance between their edges 5b, 6b, and the semicylindrical seat 2a is greater than the radius of the pipe 4 by an extent included between 0.5 and 12 mm.
  • the presence of the projections 5, 6, most reliably prevents any shifting of the flexible pipe 4 out of its original position defined during planning, even after a prolonged use of the pump, that is when the pipe 4, though still being fit from the point of view of sealing, no longer possesses the initial characteristics of stiffness which were indispensable for a proper working in the known type peristaltic pumps.
  • the flexible pipe can still be used for a long time without providing any drawbacks at all, with a considerable economic advantage compared to the previously known pumps.
  • the half-annular projections 5 and 6 can be formed by any known technique, according to the dimensions and characteristics of the pump and to the nature of the flexible pipe 4.
  • the projections 5, 6, can be provided on a conventional pump body, to which they are fixed by known fixing means as screws, adhesives, fitting in systems, and the like, as illustrated in fig. 3.
  • the projections may be formed in one piece with the pump body, both in the event that the latter is directly obtained by casting, or in the event that it is obtained or trimmed by machining, as illustrated in fig. 4.
  • the material forming the projections 5, 6, has to be carefully selected, so as not to result abrasive in respect of the pipe 4.
  • use can be made of plastic, ceramic or metallic materials, or of suitably combined mixed materials, so as to simultaneously reach the two desired objects of proper mechanical resistance and of no wear of the pipe 4.
  • the sides 5a and 6a contacting the pipe 4 will be preferably subjected to a particularly accurate surface finishing treatment.
  • the present invention has fully reached its intended object.
  • the described peristaltic pump most reliably prevents any shifting of the flexible pipe out of the respective seat during the compressive action of the pressure rollers, thereby guaranteeing a life of the pipe itself which is far longer than that of known type pumps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP89109535A 1988-06-02 1989-05-26 Peristaltic pump provided with means to contain and guide the flexible suction and delivery pipe within its seat Withdrawn EP0344640A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2135488U 1988-06-02
IT2135488U IT214318Z2 (it) 1988-06-02 1988-06-02 Pompa peristaltica provvista dimezzi di contenimento e di guida del tubo flessibile di aspirazione e mandata entro la sua sede.

Publications (1)

Publication Number Publication Date
EP0344640A1 true EP0344640A1 (en) 1989-12-06

Family

ID=11180566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109535A Withdrawn EP0344640A1 (en) 1988-06-02 1989-05-26 Peristaltic pump provided with means to contain and guide the flexible suction and delivery pipe within its seat

Country Status (2)

Country Link
EP (1) EP0344640A1 (it)
IT (1) IT214318Z2 (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2808203A1 (fr) * 2000-04-28 2001-11-02 Medtronic Inc Dispositif implantable d'injection de medicament comportant une pompe peristaltique utilisant des guides pour un tube de circulation de fluide
US6733476B2 (en) 2001-04-13 2004-05-11 Medtronic, Inc. Implantable drug delivery device with peristaltic pump having a bobbin roller assembly
US6743204B2 (en) 2001-04-13 2004-06-01 Medtronic, Inc. Implantable drug delivery device with peristaltic pump having retracting roller
CN114526220A (zh) * 2022-02-21 2022-05-24 常州普瑞流体技术有限公司 快装管式蠕动泵

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693765A (en) * 1951-09-22 1954-11-09 American Optical Corp Fluid pump and method of making the same
FR2262209A1 (en) * 1974-02-26 1975-09-19 Lauterjung Karl Peristaltic type medical feed pump - has feed tube and supporting wall interchangeably mounted in body

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693765A (en) * 1951-09-22 1954-11-09 American Optical Corp Fluid pump and method of making the same
FR2262209A1 (en) * 1974-02-26 1975-09-19 Lauterjung Karl Peristaltic type medical feed pump - has feed tube and supporting wall interchangeably mounted in body

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2808203A1 (fr) * 2000-04-28 2001-11-02 Medtronic Inc Dispositif implantable d'injection de medicament comportant une pompe peristaltique utilisant des guides pour un tube de circulation de fluide
US6733476B2 (en) 2001-04-13 2004-05-11 Medtronic, Inc. Implantable drug delivery device with peristaltic pump having a bobbin roller assembly
US6743204B2 (en) 2001-04-13 2004-06-01 Medtronic, Inc. Implantable drug delivery device with peristaltic pump having retracting roller
US7434312B2 (en) 2001-04-13 2008-10-14 Medtronic, Inc. Method for manufacturing an implantable drug delivery device with peristaltic pump having a retractable roller
CN114526220A (zh) * 2022-02-21 2022-05-24 常州普瑞流体技术有限公司 快装管式蠕动泵
CN114526220B (zh) * 2022-02-21 2023-10-27 常州普瑞流体技术有限公司 快装管式蠕动泵

Also Published As

Publication number Publication date
IT214318Z2 (it) 1990-05-03
IT8821354V0 (it) 1988-06-02

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