EP0822840A1 - Commande electromagnetique assistee par fluide magnetique pour une pompe cardiaque servant a assister le coeur ou a suppleer partiellement ou totalement la fonction cardiaque - Google Patents

Commande electromagnetique assistee par fluide magnetique pour une pompe cardiaque servant a assister le coeur ou a suppleer partiellement ou totalement la fonction cardiaque

Info

Publication number
EP0822840A1
EP0822840A1 EP97918007A EP97918007A EP0822840A1 EP 0822840 A1 EP0822840 A1 EP 0822840A1 EP 97918007 A EP97918007 A EP 97918007A EP 97918007 A EP97918007 A EP 97918007A EP 0822840 A1 EP0822840 A1 EP 0822840A1
Authority
EP
European Patent Office
Prior art keywords
heart
magnetic fluid
blood pump
support
electromagnetic drive
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Withdrawn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
EP97918007A
Other languages
German (de)
English (en)
Inventor
Thomas Hähndel
Hanns-Dietrich Stahlmann
Arnim Nethe
Johannes Müller
Norbert Buske
Armin Rehfeld
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
Priority claimed from DE19609281A external-priority patent/DE19609281C1/de
Application filed by Individual filed Critical Individual
Publication of EP0822840A1 publication Critical patent/EP0822840A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
    • H01F1/442—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids the magnetic component being a metal or alloy, e.g. Fe
    • 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
    • A61M60/165—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart
    • A61M60/178—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular 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
    • A61M60/10—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
    • A61M60/196—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body replacing the entire heart, e.g. total artificial hearts [TAH]
    • 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
    • A61M60/424—Details relating to driving for positive displacement blood pumps
    • A61M60/427—Details relating to driving for positive displacement blood pumps the force acting on the blood contacting member being hydraulic or pneumatic
    • 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
    • A61M60/80—Constructional details other than related to driving
    • A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
    • A61M60/89—Valves
    • A61M60/892—Active valves, i.e. actuated by an external force

Definitions

  • Magnetic fluid-assisted electromagnetic drive for a blood pump to support or to partially or completely replace the heart
  • the invention is based on a magnetofluid-assisted electromagnetic drive for a blood pump for support or for partial or total replacement of the heart, which consists of one or more electromagnets and force-converting devices, as is known from US Pat. No. 4,650,485 .
  • Electromagnetic Table systems consist of an electromagnet that mechanically squeezes a blood sack to promote the blood. Such an arrangement is described in detail in U.S. Patent 3,874,002. With the help of an electric motor, electromechanical systems generate a rotational movement which is converted into a pump movement. Electrohydraulic and electropneumatic systems are also known, in which a liquid or a gas is pumped into a chamber by means of a hydraulic pump or a compressor in order to move a flexible membrane for conveying the blood.
  • Magnetofluids are stable dispersions with super-magnetic properties. They consist of single domain particles which are homogeneously distributed in selectable solvents with the aid of surface-active substances. The homogeneous distribution is maintained even in a strong magnetic field (gradient).
  • the DD description 160532 describes such a magnetic fluid in detail. Magnetofluids with initial permeabilities up to 4 and saturation magnetizations up to 100 mT are known and described.
  • the invention has for its object to provide a drive for a blood pump to support or to partially or completely replace the heart, the blood pump largely corresponds to the natural heart in terms of its weight and its energy density, and is particularly suitable for implantation, a reduction in the size of the overall system compared to known systems while improving the efficiency is made possible.
  • a blood pump has a magnetofluid-assisted electromagnetic drive, which consists of one or more electromagnets and force-converting devices and in which the interspace of at least one electromagnetic circuit is completely or partially filled with magnetofluid, the poles having permanent magnetic properties .
  • the essential idea of the invention is that the effect of the intermediate space is increased by the introduced magnetic fluid (ferrofluid, magnetic fluid) because of its higher permeability. This succeeds because the transition from the highly permeable inference to the fluid is one Force increase (Maxwellian tension).
  • the negative pressure of the magnetic fluid can be used, which arises from the fact that on its free surface (for example to air), under the action of a magnetic field, force densities arise which are directed out of the magnetic fluid.
  • the simplest version of the drive can be placed directly on a blood pump as a unicameral system. In more complex designs, two-chamber or four-chamber training is also possible. Executions in series are just as possible as a parallel arrangement.
  • the drive can therefore be used in simple cardiovascular supports or can be used as a partial or even total replacement of the heart in a natural reproduction of the heart function.
  • Fig. 1 cross section of the artificial heart drive when compressed
  • Chamber, 2 cross section of the artificial heart drive during the suction process
  • Figure 1 the principle of the drive is shown schematically for a single-chamber system in section.
  • the chamber volume 10 is tightly enclosed by the chamber wall 9.
  • the chamber wall 9 is designed as a flexible membrane and has inflow and outflow pipes 11 together with the ventricle 12.
  • the flexibility of the chamber wall 9 allows the chamber volume 10 to be compressed by the drive 1 to 6.
  • the necessary power transmission is through the direct contact of the upper chamber wall 9 with the guaranteed lower core half 2.
  • the stationary parts are fixed by the housing 8, which is connected on the one hand to the lower chamber wall 9 and on the other hand to the upper core half 1.
  • the two core halves 1 and 2 close in that the magnetic fluid 5 escapes from the magnetorheological contraction space.
  • the springs 4 are tensioned for the expulsion phase.
  • the chamber volume 9 is enlarged due to the elastic forces of the chamber wall 9 and, associated with this, as shown in FIG. 2, a suction process takes place via the opened inlet ventricle 12.
  • the coils are fed from the outside through feed lines running in the channel 14.
  • the specially developed magnetofluids with a saturation magnetization of 120 to 450 mT and initial permeabilities of 5 to 25 are advantageously used.
  • These very high values for magnetofluids are achieved by using new magnetofluid compositions which contain ferromagnetic single domain particles (iron, cobalt or iron-cobalt alloys) in high concentration and which are used in low-viscosity solvents. agents are homogeneously distributed by means of surface-active compounds which are firmly anchored to the particle surface and are readily soluble in the respective solvent.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Cardiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Mechanical Engineering (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Power Engineering (AREA)
  • External Artificial Organs (AREA)
  • Prostheses (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

L'invention concerne une commande électromagnétique assistée par fluide magnétique pour une pompe cardiaque servant à assister le coeur ou à suppléer partiellement ou totalement la fonction cardiaque. La pompe présente un poids et une densité d'énergie correspondant dans une large mesure à ceux du coeur naturel, et se prête particulièrement bien à une implantation. L'invention vise à réduire la taille du système global par rapport aux systèmes connus tout en améliorant son efficacité. A cet effet, il est prévu une pompe présentant une commande électromagnétique assistée par fluide magnétique, constituée d'un ou plusieurs électro-aimants et d'unités de conversion de force. La chambre intermédiaire d'au moins un circuit électromagnétique est totalement ou partiellement remplie de fluide magnétique et les pôles présentent des propriétés magnétiques permanentes. On utilise à cet effet un fluide magnétique présentant une aimantation à saturation comprise entre 150 et 450 mT et une perméabilité initiale de 5 à 25.
EP97918007A 1996-02-27 1997-02-27 Commande electromagnetique assistee par fluide magnetique pour une pompe cardiaque servant a assister le coeur ou a suppleer partiellement ou totalement la fonction cardiaque Withdrawn EP0822840A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19609281A DE19609281C1 (de) 1996-02-27 1996-02-27 Magnetofluidunterstützter elektromagnetischer Antrieb für eine Blutpumpe zur Unterstützung oder zum teilweisen bis totalen Ersatz des Herzens
DE19609281 1996-02-27
PCT/DE1997/000441 WO1997031662A1 (fr) 1996-02-27 1997-02-27 Commande electromagnetique assistee par fluide magnetique pour une pompe cardiaque servant a assister le coeur ou a suppleer partiellement ou totalement la fonction cardiaque

Publications (1)

Publication Number Publication Date
EP0822840A1 true EP0822840A1 (fr) 1998-02-11

Family

ID=7787799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97918007A Withdrawn EP0822840A1 (fr) 1996-02-27 1997-02-27 Commande electromagnetique assistee par fluide magnetique pour une pompe cardiaque servant a assister le coeur ou a suppleer partiellement ou totalement la fonction cardiaque

Country Status (10)

Country Link
US (1) US6074365A (fr)
EP (1) EP0822840A1 (fr)
JP (1) JPH11504554A (fr)
AU (1) AU719915B2 (fr)
BR (1) BR9702122A (fr)
CA (1) CA2219490A1 (fr)
DE (1) DE19654864A1 (fr)
EA (1) EA000221B1 (fr)
HU (1) HUP9901479A3 (fr)
WO (1) WO1997031662A1 (fr)

Families Citing this family (18)

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Publication number Priority date Publication date Assignee Title
FR2772971A1 (fr) * 1997-12-23 1999-06-25 Commissariat Energie Atomique Actionneur a ferrofluide de proximite
DE19806167A1 (de) * 1998-02-14 1999-08-19 Studiengesellschaft Kohle Mbh Edelmetall-geschützte, antikorrosive magnetische Nanokolloide
DE19821968A1 (de) * 1998-05-18 1999-11-25 Studiengesellschaft Kohle Mbh Verfahren zur Modifizierung der Dispergiereigenschaften von metallorganisch-prästabilisierten bzw. -vorbehandelten Nanometallkolloiden
US6251061B1 (en) 1998-09-09 2001-06-26 Scimed Life Systems, Inc. Cardiac assist device using field controlled fluid
AUPQ100699A0 (en) 1999-06-17 1999-07-08 Northern Sydney Area Health Service An assist device for the failing heart
AUPR333301A0 (en) * 2001-02-23 2001-03-22 Northern Sydney Area Health Service Determining the volume of a normal heart and its pathological and treated variants by using dimension sensors
DE10123151B4 (de) * 2001-05-03 2007-07-19 Berlin Heart Ag Vorrichtung zur subkutanen Übertragung von Energie oder Daten
DE10227779A1 (de) * 2002-06-21 2004-01-08 Studiengesellschaft Kohle Mbh Monodisperse, magnetische Nanokolloide einstellbarer Größe und Verfahren zu deren Herstellung
CN100344874C (zh) * 2003-01-28 2007-10-24 清华大学 一种流体的传输方法及实现该方法的微型蠕动泵
TWI228101B (en) * 2003-09-26 2005-02-21 Ind Tech Res Inst Micro pump using magnetic fluid or magneto-rheological fluid
US7172551B2 (en) * 2004-04-12 2007-02-06 Scimed Life Systems, Inc. Cyclical pressure coronary assist pump
US7303581B2 (en) * 2004-09-10 2007-12-04 Peralta Eduardo J Artificial heart using magnetohydrodynamic propulsionh
US7539016B2 (en) * 2005-12-30 2009-05-26 Intel Corporation Electromagnetically-actuated micropump for liquid metal alloy enclosed in cavity with flexible sidewalls
US8128699B2 (en) * 2009-03-13 2012-03-06 Warsaw Orthopedic, Inc. Spinal implant and methods of implantation and treatment
ES2535255T3 (es) * 2009-11-06 2015-05-07 Fundación Tecnalia Research & Innovation Dispositivo y procedimiento para la fijación de piezas
US9157460B2 (en) * 2012-06-05 2015-10-13 Toyota Motor Engineering & Manufacturing North America, Inc. Controlling a fluid flow with a magnetic field
US11518957B2 (en) 2016-02-29 2022-12-06 Lord Corporation Additive for magnetorheological fluids
DE102017128271A1 (de) * 2017-08-01 2019-02-07 Schwarzer Precision GmbH & Co. KG Membranpumpe und Verfahren zur berührungslosen Betätigung der Membranen von mehreren Arbeitsräumen einer Membranpumpe

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US3768931A (en) * 1971-05-03 1973-10-30 Birch R Magnetically actuated pump with flexible membrane
US3874002A (en) * 1972-09-07 1975-04-01 Kurpanek W H Pulsatile magneto-motive artificial heart
US3912538A (en) * 1974-01-15 1975-10-14 United Technologies Corp Novel composite fuel cell electrode
GB2079381A (en) * 1980-07-09 1982-01-20 Bailey Arthur Raymond Alternating current energised gas pumping device
US4485024A (en) * 1982-04-07 1984-11-27 Nippon Seiko Kabushiki Kaisha Process for producing a ferrofluid, and a composition thereof
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Also Published As

Publication number Publication date
WO1997031662A1 (fr) 1997-09-04
BR9702122A (pt) 1999-01-26
DE19654864A1 (de) 1997-08-28
EA199700273A1 (ru) 1998-02-26
HUP9901479A2 (hu) 1999-08-30
JPH11504554A (ja) 1999-04-27
US6074365A (en) 2000-06-13
HUP9901479A3 (en) 2001-06-28
AU719915B2 (en) 2000-05-18
EA000221B1 (ru) 1998-12-24
CA2219490A1 (fr) 1997-09-04
AU2631797A (en) 1997-09-16

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