WO1991004071A1 - Appareil medical pour diagnostic ou therapie a l'aide de champs electromagnetiques - Google Patents

Appareil medical pour diagnostic ou therapie a l'aide de champs electromagnetiques Download PDF

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Publication number
WO1991004071A1
WO1991004071A1 PCT/EP1990/001568 EP9001568W WO9104071A1 WO 1991004071 A1 WO1991004071 A1 WO 1991004071A1 EP 9001568 W EP9001568 W EP 9001568W WO 9104071 A1 WO9104071 A1 WO 9104071A1
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WO
WIPO (PCT)
Prior art keywords
horseshoe
pole
magnetic core
coil
control coil
Prior art date
Application number
PCT/EP1990/001568
Other languages
German (de)
English (en)
Inventor
Thomas Weyh
Original Assignee
Thomas Weyh
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 Thomas Weyh filed Critical Thomas Weyh
Publication of WO1991004071A1 publication Critical patent/WO1991004071A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N2/00—Magnetotherapy
    • A61N2/004—Magnetotherapy specially adapted for a specific therapy
    • A61N2/006—Magnetotherapy specially adapted for a specific therapy for magnetic stimulation of nerve tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N2/00—Magnetotherapy
    • A61N2/02—Magnetotherapy using magnetic fields produced by coils, including single turn loops or electromagnets

Definitions

  • the invention relates to a medical device for diagnosis and / or therapy with the aid of electromagnetic fields for the purpose of magnetomotive stimulation of nerves, with a horseshoe-shaped magnetic core, to which at least one coil winding which can be subjected to current impulses for magnetic field generation is assigned.
  • the horseshoe-shaped magnetic core is provided with a single coil winding in the central web area between the two legs leading to the pole pieces.
  • the short-term locally limited generation of a strong magnetic field is aimed at in order to 1 trigger organism to be treated on nerve endings or nerve pathways; the area of action of the stimulus set in this way, which acts like an injection, an acupuncture needle or a laser beam, should be able to be determined in its surface parallel to the skin and in its depth by means of changeable or interchangeable pole shoes.
  • the invention is based on the object of further developing the device of the type mentioned at the outset in such a way that a precisely focussed yet far-reaching strong magnetic field can be generated.
  • the device according to the invention in which this object is achieved, is essentially characterized in that the two pole shoes of the horseshoe-shaped magnetic core are each assigned a pole shoe winding and in the area between the pole shoes carrying the two pole shoe windings at least one control coil is arranged, the turns of which are approximately 2g transverse to the plane common to the two pole pieces.
  • this device can be used to generate precisely focussable magnetic fields with a field strength of 1 to 2 Tesla with a pulse duration of approximately 200 microseconds.
  • C control coil (s) between the development pole shoes equipped er ⁇ enables this case, the magnetic field as far as possible from the - j _ fields generating device force out of stimulating the deeper lying nerve groups and non-operating advantages and de non-invasive examination or treatment method Be exploit. Since the rapidly changing magnetic field can be used to generate an electric field in a narrowly defined area within the body with the aid of the device according to the invention, an action potential can be produced on the targeted nerve.
  • the device is therefore particularly suitable for the diagnosis of the motor nerves
  • the electromagnetic nerve stimulation device is used primarily to examine Parkinsonism, Alzheimer's disease, multiple sclerosis, cerebellar (cerebellar) diseases and nerve damage in the
  • the magnetic field is generated exclusively by flat, spiral-shaped coils without the aid of control coils and without ferromagnetic materials.
  • the field at the stimulation site is therefore many times larger in space; stimulation that is precisely localized is therefore not possible. This prevents a precisely localized stimulation of lower levels
  • the horseshoe-shaped magnetic core expediently consists of ferromagnetic material with high magnetic and low electrical conductivity.
  • core material with high saturation induction and low losses in agglomeration and eddy current means that only a small amount of energy is required.
  • the horseshoe-shaped magnetic core consists of ferromagnetic glasses or layered, insulated Q soft magnetic iron cobalt sheet with a thickness of 0.3 mm.
  • FIG. 1 is a schematic perspective view of the heart of the device of the device according to the invention horseshoe magnet with associated windings, including control coil,
  • FIG. 2 is a perspective view of the flat spiral coil forming the heart of the conventional device
  • FIG. 3 shows a field strength diagram; as can be achieved with a flat spiral coil according to FIG. 2,
  • Fig. 4 is a field strength diagram, as it is "accessible by a device, with horseshoe-shaped core, but without control coil, and
  • Fig. 5 is a field strength diagram, as in accordance with the device according to the invention. Fig. 1 can be reached.
  • the horseshoe-shaped magnetic core 1 shows a horseshoe-shaped magnetic core 1 lying in a plane that is perpendicular to the xy plane.
  • the magnetic core 1 has pole shoe windings 4, 5.
  • a control coil 6 is provided in the area between the two pole pieces 2, 3.
  • the winding axis of this control coil 6 extends to the plane common to the two pole pieces 2, 3, ie approximately parallel to the xy plane, and its lower edge lies in the plane common to the two pole pieces.
  • the pole shoe windings 4, 5 are in series or parallel to one another; the control coil 6 is in series or parallel to the pole shoe windings 4, 5.
  • the horseshoe-shaped magnetic core 1 consists of ferromagnetic material with high magnetic and low electrical conductivity.
  • ferromagnetic glasses such as those used for. B. are available under the trade name Vitrovac F-4040 from Vacuumschmelze. Instead, there is also layered, soft magnetic isolation from each other Iron cobalt sheet of small thickness of about 0.3 mm can be used, as it is e.g. B. is brought onto the market by Vacuumschmelze under the trade name Vacoflux 48.
  • the greater extent of the magnetic field achieved according to the invention is of crucial importance because it can stimulate nerve structures (eg the cerebral cortex) deeper within the body. This is essentially due to the placement of the control coil
  • control coil / control coils 6 should be placed in such a way that their lower edge lies on the plane of the leg ends of the horseshoe-shaped magnetic core 1. In this way, on the one hand, the magnetic field can be pushed as far as possible out of the coil system; on the other hand, however,
  • the field strength values shown refer to a level of 20 x 20 cm, which is 2 cm below the respective
  • Fig. 3 shows the field strength curve of a commercially available stimulation device with a simple, spiral coil arrangement acc. Fig. 2.
  • the coil has 19 turns, an inductance of approximately 35 uH, an inner diameter of 5.5 cm and an outer diameter of 12.1 cm.
  • the maximum coil current is 4000 A, the maximum coil voltage is 300 V.
  • Fig. 4 shows the field strength profile of a horseshoe-shaped magnetic core without the control coil 6, in which 24 turns of a high-frequency wire (6 mm2 cross-section, diameter of the individual conductors 0.15 mm) are wound per bar.
  • the maximum coil current here is approximately 4000 A, the maximum coil voltage is reduced to approximately 1000 V.
  • the two pole shoe windings are connected in series.
  • FIG. 5 shows the field strength profile of the horseshoe-shaped magnetic core 1 according to the invention with a control coil 6 and the same specifications as in the embodiment according to FIG. 4.
  • the control coil 6 is operated at about 4000 A in series with pole shoe windings 4, 5 .
  • the maximum total voltage is approximately 1000 V.
  • the high output is achieved with the aid of a conventional supply circuit which contains a capacitor which is discharged by means of a thyristor via the circuit containing the coil.
  • the improvement with the help of the control coil 6 manifests itself in the reduction of the drop in field strength, which is very disturbing for the targeted stimulation, in the middle between the field strength peaks.
  • This drop in field strength is disturbing because it creates two spatially separate areas of the stimulation, so that a precisely localized stimulation is made more difficult.
  • the nerve stimulation only occurs above a certain threshold, when using a horseshoe-shaped device without a control coil, there are two circular, separate stimulation areas. From a medical point of view, a single oval stimulated area, as achieved by the horseshoe-shaped device with a control coil due to the threshold effect, is usually cheaper than two separate circular areas, even if the area is smaller. This makes it much easier to target the areas to be stimulated. At the target point below the arrangement, an action potential and thus nerve stimulation are also generated.
  • the new coil arrangement with the control coil / control coils 6 can advantageously achieve a considerable reduction in the amount of energy required to generate the magnetic pulses.
  • the field in the interior of the coil arrangement, where it is practically not required, is weakened by the control coil, and the energy content of the field in the ferromagnetic material is substantially lower than in air with the same flux density.
  • the field direction at the location of the stimulation is directional in the alignment of the poles of the horseshoe-shaped magnetic core 1.

Abstract

Un appareil médical pour diagnostic et thérapie à l'aide de champs électromagnétiques est utile pour la stimulation magnétomotrice des nerfs. Il comporte un noyau magnétique en forme de fer à cheval (1) associé à au moins un enroulement à bobines (4, 5) auquel peuvent être appliquées des impulsions de courant pour générer un champ magnétique. Afin de permettre l'obtention d'un champ magnétique puissant de grande portée et focalisable avec précision, un enroulement polaire (4, 5) est associé à chacune des deux pièces polaires (2, 3) du noyau magnétique en forme de fer à cheval (1). En outre, au moins une bobine de commande (6), dont les spires sont approximativement perpendiculaires au plan commun des deux pièces polaires (2, 3), est agencée entre les deux pièces polaires qui portent les enroulements polaires.
PCT/EP1990/001568 1989-09-15 1990-09-14 Appareil medical pour diagnostic ou therapie a l'aide de champs electromagnetiques WO1991004071A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3930930.4 1989-09-15
DE19893930930 DE3930930C1 (fr) 1989-09-15 1989-09-15

Publications (1)

Publication Number Publication Date
WO1991004071A1 true WO1991004071A1 (fr) 1991-04-04

Family

ID=6389552

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/001568 WO1991004071A1 (fr) 1989-09-15 1990-09-14 Appareil medical pour diagnostic ou therapie a l'aide de champs electromagnetiques

Country Status (2)

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DE (1) DE3930930C1 (fr)
WO (1) WO1991004071A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0906136A1 (fr) 1994-11-28 1999-04-07 Neotonus, Inc. Stimulateur nerveux magnetique destine a l'excitation des nerfs peripheriques
EP1044034A1 (fr) * 1997-12-31 2000-10-18 Neotonus, Inc. Neurostimulateur magnetique permettant d'exciter les nerfs peripheriques
DE112008004049T5 (de) 2008-10-31 2012-06-06 Nexstim Oy, Magnetische Stimulierspulen mit elektrisch leitenden Strukturen

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69737910T2 (de) * 1996-08-15 2008-03-13 Neotonus, Inc. Vorrichtung zur transkranialen stimulation des gehirns
DE19957701A1 (de) * 1999-11-30 2001-05-31 Gerdel Ben Kayed Krebsbekämpfung-Heilung
DE10055686A1 (de) 2000-11-03 2002-05-08 Biotronik Mess & Therapieg Vorrichtung zur Beeinflussung von Zellproliferationsmechanismen in Gefäßen des menschlichen oder tierischen Körpers
DE102006022147B4 (de) * 2006-05-08 2008-11-27 Technische Universität Ilmenau Verfahren und Verwendung einer Vorrichtung zur elektromagnetischen Modifizierung von magnetischen Materialien
DE102009023855B4 (de) * 2009-06-04 2013-01-31 Technische Universität München Vorrichtung zur Nervenreizung mit Magnetfeldimpulsen
CZ306539B6 (cs) * 2015-07-06 2017-03-01 Tesla Medical, S.R.O. Elektrostimulační zařízení
KR102588001B1 (ko) 2015-07-06 2023-10-11 스팀비아 에스.알.오. 전기 자극 디바이스
CZ306538B6 (cs) * 2015-07-06 2017-03-01 Tesla Medical, S.R.O. Elektrostimulační zařízení
TW201922313A (zh) * 2017-11-09 2019-06-16 童瀚 可攜式重複透顱磁刺激儀器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056717A2 (fr) * 1981-01-16 1982-07-28 Inoue-Japax Research Incorporated Appareil de filtration magnétique
WO1988009191A1 (fr) * 1987-05-27 1988-12-01 Gentarou Shinagawa Appareil thermotherapeutique electromagnetique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2632501A1 (de) * 1976-07-20 1978-01-26 Ludwig Wolfgang Dr Rer Nat Magnetimpulsgeraet und seine medizinische anwendung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0056717A2 (fr) * 1981-01-16 1982-07-28 Inoue-Japax Research Incorporated Appareil de filtration magnétique
WO1988009191A1 (fr) * 1987-05-27 1988-12-01 Gentarou Shinagawa Appareil thermotherapeutique electromagnetique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0906136A1 (fr) 1994-11-28 1999-04-07 Neotonus, Inc. Stimulateur nerveux magnetique destine a l'excitation des nerfs peripheriques
EP0906136B1 (fr) * 1994-11-28 2004-06-30 Neotonus, Inc. Stimulateur nerveux magnetique destine a l'excitation des nerfs peripheriques
EP1062988B1 (fr) * 1994-11-28 2005-01-26 Neotonus, Inc. Stimulateur magnétique destiné à la stimulation de nerfs périphériques
EP1044034A1 (fr) * 1997-12-31 2000-10-18 Neotonus, Inc. Neurostimulateur magnetique permettant d'exciter les nerfs peripheriques
DE112008004049T5 (de) 2008-10-31 2012-06-06 Nexstim Oy, Magnetische Stimulierspulen mit elektrisch leitenden Strukturen

Also Published As

Publication number Publication date
DE3930930C1 (fr) 1990-10-11

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