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WO2000062841A1 - Dispositif de refoulement axial de substances fluides - Google Patents

Dispositif de refoulement axial de substances fluides Download PDF

Info

Publication number
WO2000062841A1
WO2000062841A1 PCT/EP2000/003560 EP0003560W WO0062841A1 WO 2000062841 A1 WO2000062841 A1 WO 2000062841A1 EP 0003560 W EP0003560 W EP 0003560W WO 0062841 A1 WO0062841 A1 WO 0062841A1
Authority
WO
WIPO (PCT)
Prior art keywords
pole piece
magnetic
end faces
annular gap
tubular
Prior art date
Application number
PCT/EP2000/003560
Other languages
German (de)
English (en)
Inventor
Peter NÜSSER
Johannes Müller
Hans-Erhard Peters
Norbert Buske
Werner Neumann
Kurt Graichen
Original Assignee
Berlin Heart 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 Berlin Heart Ag filed Critical Berlin Heart Ag
Priority to AU45532/00A priority Critical patent/AU4553200A/en
Publication of WO2000062841A1 publication Critical patent/WO2000062841A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F04D3/02—Axial-flow pumps of screw type
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/20—Type thereof
    • A61M60/205—Non-positive displacement blood pumps
    • A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
    • A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0646—Units comprising pumps and their driving means the pump being electrically driven the hollow pump or motor shaft being the conduit for the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/086—Sealings especially adapted for liquid pumps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/10—Location thereof with respect to the patient's body
    • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
    • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
    • A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/40—Details relating to driving
    • A61M60/403—Details relating to driving for non-positive displacement blood pumps
    • A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/80—Constructional details other than related to driving
    • A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
    • A61M60/827—Sealings between moving parts
    • A61M60/829—Sealings between moving parts having a purge fluid supply

Definitions

  • the invention relates to a device for the axial conveyance of fluid media according to the preamble of claim 1.
  • Devices for the axial conveyance of fluid media are known. These devices, which are also referred to as axial pumps, are used in particular for the gentle delivery of fluids in medical fields.
  • axial pumps are used in particular for the gentle delivery of fluids in medical fields.
  • the publication "Heart Replacement Artificial Heart 5", pages 245 to 252, Springer Verlag, Tokyo 1996 describes an axial blood pump to support a diseased heart, which can be implanted in a patient's chest.
  • the invention has for its object to provide a device for the axial requirement of fluid media, which has a low-friction and no turbulence-generating seal between the fixed tubular hollow body and the rotating tubular conveying part and in the sealant can not be absorbed by the fluid medium to be requested.
  • Magnetic fluids are stable dispersions with superparamagnetic properties.
  • the dispersions generally consist of the magnetic component, amphiphilic additives and a carrier liquid.
  • As magnetic Component are used remote or ferromagnetic particles, the particle size is between 3 and 50nm.
  • the so-called amphiphilic additives give the particles either hydrophilic or hydrophobic properties and can thus be homogeneously finely distributed in either aqueous or organic carrier liquids.
  • the composition of the magnetic fluid depends on its application, which determines the desired saturation magnetization and the chemical composition. Saturation magnetization determines the interaction of the magnetic flux in the magnetic field. The stronger the magnetization, the greater the pressure differences the gasket can withstand.
  • the carrier liquid in these applications consists of high-boiling liquids to prevent the carrier liquid from evaporating.
  • the type of amphiphilic additives depends both on the magnetic component used and on the carrier liquid. The nature of the surfactants determines their fixation on the particle surface of the magnetic component or the solubility of the particles in the respective carrier liquid.
  • the carrier liquids e can advantageously be oil-like or aqueous liquids, depending on the nature of the fluid medium.
  • Magnetic liquid is completely fixed in the annular gap by the application of a magnetic field according to the invention.
  • This seal has proven to be extremely low-friction, so that the energy expenditure for generating the rotation can be greatly minimized and heating of the medium to be conveyed does not occur or only occurs to a small extent.
  • 4a is an axial view of the magnetic fluid seal with a ring magnet
  • Fig. 8 is a detailed representation of the magnetic fluid seal with asymmetrically attached magnets.
  • FIG. 1 shows a half section of an exemplary embodiment of a conveyor device according to the invention.
  • the direction of delivery of the fluid medium is marked with an arrow.
  • the fluid medium is introduced into the pump area through an inlet connector 7.
  • the input connector 7 is fixed.
  • An impeller 2 is fastened in an adjoining rotor tube 1.
  • This is followed by an output connector 10, which contains a so-called stator 11 rigidly attached.
  • An input ring gap 16 and an output ring gap 17 are formed between the rotor tube 1 and the input connector 7 on one side and the output connector 10 and the rotor tube 1 on the other side.
  • An input seal 8 and an output seal 12 are arranged around the input ring gap 16 and the output ring gap 17.
  • a motor rotor 3 On the outside of the impeller 2, a motor rotor 3 is attached, which with a motor stator 4 ensures a rotational movement of the rotor tube 1 and thus the impeller 2.
  • the energy supply for this drive is not shown here.
  • the entire pump area is fixed ⁇ mgangsgehause 9, exit housing 13 and Laufergehause 5 covered.
  • the motor stator 4 is rigidly attached directly to the rotor housing 5.
  • the rotor housing 5 is separated from the input housing 9 and output housing 13 by an input holder 14 and an output holder 15.
  • the input bracket 14 and the output bracket 15 each hold a bearing 6, which ensure the stabilization of the rotational movement of the impeller 2.
  • a magnetic fluid seal of the device according to the invention which is provided as an inlet seal 8 and / or as an outlet seal 12, is shown in detail in a sectional view, here and also in the further FIGS the conveyor is shown.
  • the exemplary embodiments of the magnetic fluid seal are shown on the tube walls 104a and 105a of the tubes 104 and 105 in the region of tube ends 109 and 110.
  • the tube ends 9 and 10 are so close to one another that an annular gap 101 defined by end faces 114 and 115 is formed.
  • the magnet arrangement 108 contains a magnet 106, which is positioned discretely distributed around the annular gap 101 in an annular or annular manner, and so-called pole shoes 102 and 103, which serve to transmit the magnetic flux and the optimal orientation of the magnetic field in the annular gap 101.
  • the pole piece 103 is with the Pipe wall 105a connected.
  • the pole piece 102 forms a secondary gap 107 with the tube wall 104a.
  • the magnet 106 is held by the pole piece 103 above the annular gap 101.
  • the tube ends 109 and 110 are connected to the magnet 106 in a magnetically conductive manner via the pole shoes 102 and 103.
  • the size of the secondary gap 107 formed between the pole piece 102 of the magnet arrangement 108 and the tube wall 104a is such that the magnetic field can be transmitted from the magnet 106 to the tube end 109 via the pole piece 102.
  • the secondary gap 107 enables flexible coupling of the two tubes 104 and 105.
  • the transmission of the magnetic flux via the pole shoes 102 and 103 leads to the formation of a magnetic north and south pole at the tube ends 109 and 110, between which the magnetic fluid 111 is held.
  • FIG. 3 shows a development of the device according to the invention, the pipes 104 and 105 of which are to be connected and are made of non-magnetizable material.
  • the pole shoes 102 and 103 are attached to the end of the pipe ends 109 and 110 of the non-magnetizable pipes 104 and 105.
  • the pole shoe 102 is divided into two to maintain the secondary gap 107.
  • a magnetic part 102a of the pole piece 102 is in direct contact with the magnet 106 and a tube part 102b of the pole piece 102 is attached to the end of the tube end 109.
  • the tubular part 102b and the magnetic part 102a form the secondary gap 107.
  • the annular gap 101 is formed between the pole shoe 103 attached on the end face and the tubular part 102b of the pole shoe 102 and has the required different magnetic polarity for fixing the magnetic fluid 111.
  • 4a and 4b show axial views of the device according to the invention viewed from tube 104. The two views are partially cut away in order to recognize the formation of the magnet 106.
  • a circular cross section of the pipes 104 and 105 to be connected is assumed.
  • 4a a ring-shaped magnet 106 is provided, which is fixed between the pole shoes 102 and 103.
  • 4b on the other hand, two opposing individual magnets 106 are arranged, which are also fixed between the pole shoes 102 and 103.
  • the pole shoes 102 and 103 have a different shape here. This shape is necessary in order to optimize the magnetic field formation in the direction of the annular gap 101.
  • the tube 104 forms the secondary gap 107 with the pole shoe 102.
  • two magnets 106 are shown in an individual arrangement by way of example, but depending on the sealing problems to be solved between two tubes 104 and 105, the further arrangement of magnets 106 is advantageously possible. To do this, it would then be necessary to adapt the shape of the pole shoes 102 and 103.
  • FIG. 5 allows for the arrangement of a circumferential barrier 112 which has an axial gap with the pole shoe 102 113 forms to build up a magnetic counterforce that counteracts the attraction between the end faces 114 and 115. This is achieved in that the barrier 112 is also magnetically polarized with respect to the pole shoe 102.
  • 6a to 6g show different embodiments of the annular gap 101 or the end faces 114 and 115 which delimit the annular gap 101 in the axial direction.
  • the magnetic fluid 111 is arranged in the annular gap 101.
  • the magnet 106 of the magnet arrangement 108 is fastened directly on the tube wall 105a.
  • the pole piece 102 transmits the magnetic field across the secondary gap 107 to the tube end 109 of the soft magnetic tube 104.
  • the magnet 106 is arranged on the tube end 110, the magnet 106 being designed as a ring magnet.
  • a pole ring 116 is attached directly to the magnet 106 and forms the annular gap 101 with its end face 114 and the end face 115 of the tube end 109.
  • the pole piece 103 is guided across the magnet 106 and the annular gap 101 to the tube end 109.
  • it forms the secondary gap 107 with the tube wall 104a of the soft magnetic tube 104. 1

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Cardiology (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

L'invention vise à mettre au point un dispositif permettant le refoulement axial de substances fluides qui assurent une étanchéité induisant peu de friction et aucune turbulence, entre un corps creux tubulaire fixe et une partie de refoulement tubulaire rotative, et où les moyens d'étanchéité ne peuvent être absorbés par les substances fluides à refouler. A cet effet, il est prévu que les fentes entre les corps creux tubulaires fixes et la partie de refoulement rotative présentent une étanchéité par liquide aimanté.
PCT/EP2000/003560 1999-04-20 2000-04-19 Dispositif de refoulement axial de substances fluides WO2000062841A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU45532/00A AU4553200A (en) 1999-04-20 2000-04-19 Device for axially delivering fluidic media

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19918838.6 1999-04-20
DE19918838 1999-04-20

Publications (1)

Publication Number Publication Date
WO2000062841A1 true WO2000062841A1 (fr) 2000-10-26

Family

ID=7905857

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/003560 WO2000062841A1 (fr) 1999-04-20 2000-04-19 Dispositif de refoulement axial de substances fluides

Country Status (3)

Country Link
AU (1) AU4553200A (fr)
DE (1) DE20007582U1 (fr)
WO (1) WO2000062841A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016047687A1 (fr) * 2014-09-26 2016-03-31 株式会社ハイレックスコーポレーション Pompe centrifuge à usage médical et dispositif d'assistance cardiaque artificielle intégrant la pompe centrifuge à usage médical
WO2019089373A1 (fr) * 2017-11-06 2019-05-09 Heartware, Inc. Dav avec orifices d'accès fluidique intra-boîtier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037984A (en) * 1967-10-26 1977-07-26 Bio-Medicus, Inc. Pumping apparatus and process characterized by gentle operation
US4310930A (en) * 1979-11-28 1982-01-19 U.S. Philips Corporation Rigid-vane artifical heart
GB2236363A (en) * 1986-06-24 1991-04-03 Papst Motoren Gmbh & Co Kg An arrangement for a magnetic fluid seal
DE19654834A1 (de) 1996-12-23 1998-07-09 Peter Dr Ing Nuesser Vorrichtung zur schonenden Förderung von ein- und mehrphasigen Fluiden
US5957504A (en) 1997-04-10 1999-09-28 Senior Engineering Investments Ag Exhaust manifold attachment apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037984A (en) * 1967-10-26 1977-07-26 Bio-Medicus, Inc. Pumping apparatus and process characterized by gentle operation
US4310930A (en) * 1979-11-28 1982-01-19 U.S. Philips Corporation Rigid-vane artifical heart
GB2236363A (en) * 1986-06-24 1991-04-03 Papst Motoren Gmbh & Co Kg An arrangement for a magnetic fluid seal
DE19654834A1 (de) 1996-12-23 1998-07-09 Peter Dr Ing Nuesser Vorrichtung zur schonenden Förderung von ein- und mehrphasigen Fluiden
US5957504A (en) 1997-04-10 1999-09-28 Senior Engineering Investments Ag Exhaust manifold attachment apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016047687A1 (fr) * 2014-09-26 2016-03-31 株式会社ハイレックスコーポレーション Pompe centrifuge à usage médical et dispositif d'assistance cardiaque artificielle intégrant la pompe centrifuge à usage médical
JP2016067376A (ja) * 2014-09-26 2016-05-09 株式会社ハイレックスコーポレーション 医療用遠心ポンプ及び該医療用遠心ポンプを有する人工補助心臓
US10478541B2 (en) 2014-09-26 2019-11-19 Hi-Lex Corporation Centrifugal pump for medical use and artificial heart assist device having centrifugal pump for medical use
WO2019089373A1 (fr) * 2017-11-06 2019-05-09 Heartware, Inc. Dav avec orifices d'accès fluidique intra-boîtier
CN111295210A (zh) * 2017-11-06 2020-06-16 心脏器械股份有限公司 具有壳体内流体进入端口的心室辅助装置(vad)
US11058863B2 (en) 2017-11-06 2021-07-13 Heartware, Inc. VAD with intra-housing fluid access ports
CN111295210B (zh) * 2017-11-06 2022-12-20 心脏器械股份有限公司 具有壳体内流体进入端口的心室辅助装置(vad)
US11701510B2 (en) 2017-11-06 2023-07-18 Heartware, Inc. VAD with intra-housing fluid access ports

Also Published As

Publication number Publication date
DE20007582U1 (de) 2000-09-28
AU4553200A (en) 2000-11-02

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