EP0781447B1 - Dispositif de production d'ondes de choc pour therapie medicale, en particulier pour la lithotriptie electro-hydraulique - Google Patents

Dispositif de production d'ondes de choc pour therapie medicale, en particulier pour la lithotriptie electro-hydraulique Download PDF

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Publication number
EP0781447B1
EP0781447B1 EP94928388A EP94928388A EP0781447B1 EP 0781447 B1 EP0781447 B1 EP 0781447B1 EP 94928388 A EP94928388 A EP 94928388A EP 94928388 A EP94928388 A EP 94928388A EP 0781447 B1 EP0781447 B1 EP 0781447B1
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EP
European Patent Office
Prior art keywords
electrodes
particles
shock waves
spark discharge
medium
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
EP94928388A
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German (de)
English (en)
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EP0781447A1 (fr
Inventor
Erwin Simnacher
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HMT High Medical Technologies Entwicklungs und Vertriebs AG
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HMT High Medical Technologies Entwicklungs und Vertriebs AG
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Application filed by HMT High Medical Technologies Entwicklungs und Vertriebs AG filed Critical HMT High Medical Technologies Entwicklungs und Vertriebs AG
Priority to AT94928388T priority Critical patent/ATE180914T1/de
Publication of EP0781447A1 publication Critical patent/EP0781447A1/fr
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/04—Sound-producing devices
    • G10K15/06—Sound-producing devices using electric discharge

Definitions

  • the invention relates to a device for generating of shock waves caused by spark discharge between electrodes in a liquid medium such as water is fed intermittently with electrical current be, the shock waves on the object located in a body be focused.
  • a device of this type is known from DE-PS 23 51 247. In it a device for crushing concrements in the body of Living being described. With the help of a spark discharge in a liquid Medium become at the focus of a blunted ellipsoid of revolution Shock waves generated, reflected on the ellipsoid and in the second focal point focused. In this second focal point, the ones to be smashed Brought concretions.
  • the spark discharge takes place on one interchangeable device, in which there are at least two electrodes face each other, between which the discharge takes place.
  • DE-OS 26 35 635 such a device is described in essentially consisting of two axially arranged electrode tips, one low-induction power supply and the mechanical bracket or Embedding the electrodes.
  • the electrodes form together with a high voltage switch and a high voltage resistant capacity low-inductance and low-resistance circuit.
  • the capacitance to a voltage of the order of about 10 kV up to 30 kV charged.
  • This tension is intermittent across the High voltage switch to those located in an aqueous environment Electrodes applied. Is the distance between the two at a given voltage If the electrodes are not too large, an electrical one takes place between the electrodes Breakthrough in the form of a spark discharge. The electrical resistance between the electrodes drops sharply, and the capacity discharges in a dampened periodic oscillation. Between the Closing the high voltage switch and the sharp drop in resistance a certain time passes between the electrodes, the Latency during which a small current flows is essentially by the ohmic resistance of that between the electrodes liquid medium is limited.
  • DE-PS 36 37 326 describes the use of an auxiliary electrode, to a controlled leader geometry and larger ones Lead distances.
  • the leader is initially a low-current one Channel that precedes the actual spark discharge and their local course determined. Because very close to a spark discharge suitable mechanical loads occur, is a suitable construction difficult to realize.
  • the auxiliary electrode must be separate from the two main electrodes are supplied with voltage, so that these devices cannot be used in existing systems.
  • DE-A-1 252 449 describes a device for generating short-term high energy hydraulic pressure surges for machining metals or described for other mechanical work purposes, in which the Liquid medium surrounding conductive particles introduced and in be kept in a working chamber.
  • DE-A-1 277 716 describes a radio sound transmitter for use in Boreholes, being within a pressure-resistant housing of the liquid filling a platinum group metal catalyst in the form of colloidal Solutions, fine powdery suspensions or added on carriers becomes.
  • GB-A-2 229 528 discloses a method and an apparatus as known inferred, using shock waves for stimulation during extraction of oil, gas and the like be used from boreholes.
  • the invention is based on the object between two in one electrodes present in a liquid breakdown To achieve a spark discharge at a distance between the electrodes, which goes beyond a critical level, in the case of a given liquid Medium and given amount of applied voltage without further Measures, no spark discharge would take place.
  • the medium with the contained therein Particle is in a shock wave permeable surrounding the electrodes Case housed the at least one opening for the escape of the gas generated during spark discharge Has.
  • the diameter of this opening should be so large that the Exchange between the interior of the envelope and the exterior of the envelope particles located in the liquid medium is restricted.
  • the liquid medium in the shell becomes the particles added once, several times or continuously.
  • the cover has a closable opening to fill them up.
  • the particles range in size from a few micrometers to a few hundred micrometers.
  • Metallic particles in particular particles made of aluminum.
  • the device according to the invention is at least around one electrode a ring surrounding it Aperture arranged.
  • This aperture absorbs and / or reflects Parts of the shock wave caused by the spark discharge.
  • the focus area in the second focal point is its size and shape influenced, and it is particularly in the case of large electrode distances Focus extension on one for extracorporeal shock wave lithotripsy (ESWL) application-appropriate measure.
  • ESWL extracorporeal shock wave lithotripsy
  • the panel is preferably made of polyurethane.
  • Fig. 1 shows schematically a section through the longitudinal axis of a blunted rotational ellipsoids.
  • the blunted Rotational ellipsoids become the shock waves coming from a focus F1 reflected and focused towards a focus F2.
  • the blunted Rotational ellipsoid is filled with degassed water and after closed at the top by a shock-permeable elastic membrane.
  • the acoustic coupling takes place via this membrane 2 a body, with concretions to be crushed or treated Focus on tissue F2.
  • the focus is on F1 two electrodes 3 and 4 face each other, on which the spark discharge and thus the shock wave generation takes place.
  • the two electrodes 3 and 4 are part of an interchangeable device.
  • the electrical circuit shows a charging resistor 5, a high voltage capacitor 6 and a high-voltage switch 7.
  • the high-voltage capacitor 6 is connected to the charging resistor 5 Using a high voltage power source to a voltage of the order of magnitude brought from 10,000 V to 30,000 V. Via the high voltage switch 7, which, for example, from a triggerable spark gap there is, the high voltage capacitor 6 with the two Electrodes 3 and 4 connected. Is the distance between the two electrodes 3 and 4 depending on the level of the high-voltage switch 7 applied voltage is not too high, so there is between the two Electrodes 3 and 4 have a voltage breakdown in the form of a spark discharge. This forms between the two electrodes 3 and 4 a discharge channel in the form of a hot plasma, which on Due to its rapid expansion it leads to a shock wave.
  • Conductive, semiconducting or polarizable particles 15 in the order of magnitude from a few micrometers to a few hundred micrometers brought and kept there. It has been shown that even at intervals of electrodes 3 and 4, which go beyond a critical level, at which would otherwise no longer break down, reliably a spark discharge occurs.
  • the particles Preferably have one Size from 50 ⁇ m to 500 ⁇ m.
  • the electrode 2 shows an embodiment of the electrodes 3 and 4 containing device.
  • the electrode 3 is in plastic insulation 8 embedded and has an electrical feed in the form of a metallic inner conductor 9.
  • the electrode 4 is tubular Outer conductor 10 electrically connected.
  • the space around the electrodes 3 and 4 is enclosed by a shock-permeable sheath 11, which two holes 12 and 13 of several hundred micrometers each having.
  • the casing 11 is filled with degassed water 14, which has a resistivity of about 2000 ohms x cm.
  • the particles 15 are added to water.
  • This device is attached in a system according to FIG. 1 so that the center between the two electrodes 3 and 4 is in focus F1 of the blunted ellipsoid of revolution is located.
  • Via the inner conductor 9 and the outer conductor 10 is when switching the high voltage switch 7 a high voltage is applied to the electrodes 3 and 4.
  • a high voltage is applied to the electrodes 3 and 4.
  • the tips of electrodes 3 and 4 Material removed so that the distance between the electrodes increasingly enlarged.
  • the conductive, semi-conductive or polarizable Particles 15 cause one to be much more critical Dimension beyond the distance of the electrodes 3 and 4 reliably a Spark discharge takes place.
  • the gas generated with each spark discharge escapes through the Bores 12 and 13 from the shell 11.
  • the holes 12 and 13 are attached so that in every possible position of the blunted Rotational ellipsoids one of the holes at the highest point of the is enclosed by the envelope 11 space.
  • FIG. 3 shows a sectional view of the electrodes 3 and 4, wherein the electrode 3 is surrounded by a rotationally symmetrical diaphragm 16.
  • This aperture 16 consists of electrically non-conductive, shock wave absorbing and / or reflective material.
  • the aperture 16 provides large electrode distances for the fact that shock wave components, which from Discharge channel 17 are generated relatively far from focus F1, cannot get to focus F2. This keeps the focus area of F2 small and corresponds to that of a spark discharge over a small one Electrode gap generated area.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Surgical Instruments (AREA)
  • Disintegrating Or Milling (AREA)

Claims (7)

  1. Dispositif de production d'ondes de choc par décharge à étincelles pour la thérapie médicale, en particulier la lithotripsie électro-hydraulique, avec des électrodes (3, 4) qui sont alimentées en courant de manière intermittente dans un milieu (14) tel que de l'eau, et avec un dispositif de focalisation focalisant les ondes de choc sur l'objet se trouvant dans un corps,
    caractérisé en ce que
    le milieu liquide (14) dans lequel des particules (15) conductrices, semi-conductrices ou polarisables sont introduites entre les électrodes (3, 4) et y sont maintenues, est logé dans une douille (11) perméable aux ondes de chocs, entourant les électrodes (3, 4) et présentant au moins une ouverture (12, 13) destinée à l'échappement de gaz.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    les particules (15) contenues dans le milieu (14) présentent un diamètre allant de quelques micromètres à quelques centaines de micromètres.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que
    le milieu (14) contient des particules (15) métalliques.
  4. Dispositif selon la revendication 3,
    caractérisé en ce que
    le milieu (14) contient des particules en aluminium.
  5. Dispositif selon l'une des revendications 1 à 4,
    caractérisé en ce qu'
    au moins autour d'une électrode (3) est disposé un diaphragme-écran (16).
  6. Dispositif selon la revendication 5,
    caractérisé en ce que
    le diaphragme-écran (16) est constitué de polyuréthane.
  7. Dispositif selon l'une des revendications 1 à 6, équipé d'un condensateur haute tension (6) pour appliquer aux électrodes une haute tension, de 10 000 V jusqu'à 30 000 V.
EP94928388A 1994-09-21 1994-09-21 Dispositif de production d'ondes de choc pour therapie medicale, en particulier pour la lithotriptie electro-hydraulique Expired - Lifetime EP0781447B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT94928388T ATE180914T1 (de) 1994-09-21 1994-09-21 Vorrichtung zur erzeugung von stosswellen für die medizinische therapie, insbesondere für die elektro-hydraulische lithotripsie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1994/003155 WO1996009621A1 (fr) 1994-09-21 1994-09-21 Procede et dispositif de production d'ondes de choc pour therapie medicale, en particulier pour la lithotriptie electro-hydraulique

Publications (2)

Publication Number Publication Date
EP0781447A1 EP0781447A1 (fr) 1997-07-02
EP0781447B1 true EP0781447B1 (fr) 1999-06-02

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EP94928388A Expired - Lifetime EP0781447B1 (fr) 1994-09-21 1994-09-21 Dispositif de production d'ondes de choc pour therapie medicale, en particulier pour la lithotriptie electro-hydraulique

Country Status (5)

Country Link
US (1) US6113560A (fr)
EP (1) EP0781447B1 (fr)
JP (1) JP3594610B2 (fr)
DE (1) DE59408375D1 (fr)
WO (1) WO1996009621A1 (fr)

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DE10100974A1 (de) * 2001-01-11 2002-08-01 Hmt Ag Vorrichtung zur Erzeugung von Stoßwellen
DE102006002412A1 (de) * 2006-01-18 2007-07-19 Switech Medical Ag Vorrichtung zur Erzeugung von Stoßwellen
EP2068304A1 (fr) * 2007-12-05 2009-06-10 General Electric Company Système de sonde, système à ultrasons et procédé de génération d'ultrasons

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DE10100974A1 (de) * 2001-01-11 2002-08-01 Hmt Ag Vorrichtung zur Erzeugung von Stoßwellen
DE10100974B4 (de) * 2001-01-11 2004-07-08 Hmt High Medical Technologies Ag Vorrichtung zur Erzeugung von Stoßwellen
DE102006002412A1 (de) * 2006-01-18 2007-07-19 Switech Medical Ag Vorrichtung zur Erzeugung von Stoßwellen
EP2068304A1 (fr) * 2007-12-05 2009-06-10 General Electric Company Système de sonde, système à ultrasons et procédé de génération d'ultrasons

Also Published As

Publication number Publication date
WO1996009621A1 (fr) 1996-03-28
JPH10508221A (ja) 1998-08-18
US6113560A (en) 2000-09-05
EP0781447A1 (fr) 1997-07-02
DE59408375D1 (de) 1999-07-08
JP3594610B2 (ja) 2004-12-02

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