EP0266538B1 - Shock wave generator - Google Patents

Shock wave generator Download PDF

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Publication number
EP0266538B1
EP0266538B1 EP87113986A EP87113986A EP0266538B1 EP 0266538 B1 EP0266538 B1 EP 0266538B1 EP 87113986 A EP87113986 A EP 87113986A EP 87113986 A EP87113986 A EP 87113986A EP 0266538 B1 EP0266538 B1 EP 0266538B1
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EP
European Patent Office
Prior art keywords
membrane
shock wave
conductive tracks
electrically conductive
distance
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
EP87113986A
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German (de)
French (fr)
Other versions
EP0266538A1 (en
Inventor
Matthias Dipl.-Ing. Mahler
Manfred Rattner
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.)
Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0266538A1 publication Critical patent/EP0266538A1/en
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Publication of EP0266538B1 publication Critical patent/EP0266538B1/en
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Expired - Lifetime legal-status Critical Current

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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
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated

Definitions

  • the invention relates to a shock wave source for the treatment of concretions in the body of a patient with a liquid-filled shock wave tube, one end of which is closed by a flexible sack that can be pressed against the patient by means of the liquid pressure, and at the other end of which there is a membrane which is separated by an insulating material layer , opposite a surface coil, which is connected to a supply unit for generating high-voltage pulses.
  • a shock wave source of this type is e.g. used to crush kidney stones.
  • an acoustic lens is arranged in the shock wave tube, which bundles the shock waves generated with the aid of the surface coil and the membrane onto a focus in which the kidney stone is arranged.
  • the particles of the kidney stone created by crushing go off naturally.
  • the surface coil is formed by a spiral winding, one end of which is grounded.
  • the opposite membrane made of metal is also grounded. If a high-voltage pulse is applied to the surface coil, the membrane is magnetically repelled due to the eddy currents generated thereby and initially generates a flat shock wave in the liquid in the shock wave tube, which is focused onto the focus by an acoustic lens.
  • the voltage between the high-voltage side coil end and the membrane is equal to the maximum value of the high voltage, so that arcing can occur, through which the membrane can be destroyed.
  • the invention has for its object to provide a shock wave source of the type mentioned so that the risk of Arcing between the surface coil and the membrane compared to the prior art is reduced.
  • the membrane has an insulating disk on which electrically conductive tracks are applied, which are arranged such that in the event of a voltage flashover between the surface coil and the membrane, apart from twice the distance of the membrane from the surface coil, the distance between the electrically conductive tracks must be overcome.
  • the membrane is not electrically conductive in its entirety, but only has electrically conductive, mutually insulated tracks. The entire path that would have to be overcome in the event of a rollover thus comprises twice the distance between the electrically conductive tracks from the flat coil and additionally the distances between the individual conductive tracks and is accordingly considerably longer than in the prior art.
  • several conductive tracks as provided in accordance with the invention not only have the advantage of a distance to be overcome in the event of a rollover, but also the distance between the individual conductive tracks the advantage of a lower mass. Accordingly, in the case of several conductive paths for accelerating the membrane, less energy is required or, with the same energy, greater acceleration of the membrane and thus a steeper pressure increase of the generated shock wave can be achieved. A steepest possible increase in pressure is sought because shock waves are more suitable for crushing concrements, the steeper the pressure increase they have.
  • FIG. 1 shows a shock wave tube 1 which is filled with water as the coupling medium, the pressure of which can be controlled in a known manner, not shown.
  • the application side of the shock wave tube 1 is closed by an elastic bag 2.
  • the opposite side is closed by a membrane 3.
  • Inside the shock wave tube 1 there is an acoustic lens 4 for focusing the shock waves on one focus.
  • the high-voltage side end 6a of the surface coil 6 can be connected to a high-voltage generator 8 for generating high-voltage pulses, while the other end 6b of the surface coil 6 is grounded.
  • the surface coil is subjected to 6 high-voltage pulses from e.g. about 20 kV supplied.
  • 6 high-voltage pulses from e.g. about 20 kV supplied.
  • eddy currents are generated in the membrane 3, which cause the membrane 3 to be repelled by the surface coil 6, as a result of which plane shock waves are first generated in the water in the shock wave tube 1, which are then bundled in the manner described by the acoustic lens 4.
  • the membrane 3 according to FIG. 2 is formed by a circular insulating disk on which electrically conductive tracks 9, 10, 11, for example made of silver-plated copper, are applied are.
  • the tracks 9, 10 are designed as concentric rings.
  • the web 1 in the center of the membrane 3 is a disk-shaped support made of electrically conductive material on the insulating disk.

Description

Die Erfindung betrifft eine Stoßwellenquelle zur Behandlung von Konkrementen im Körper eines Patienten mit einem flüssigkeitsgefüllten Stoßwellenrohr, dessen eines Ende von einem über den Flüssigkeitsdruck an den Patienten andrückbaren, flexiblen Sack verschlossen ist und an dessen anderem Ende eine Membran liegt, der, durch eine Isolierstoffschicht getrennt, eine Flächenspule gegenüberliegt, welche an einer Versorgungseinheit zur Erzeugung von Hochspannungsimpulsen angeschlossen ist.The invention relates to a shock wave source for the treatment of concretions in the body of a patient with a liquid-filled shock wave tube, one end of which is closed by a flexible sack that can be pressed against the patient by means of the liquid pressure, and at the other end of which there is a membrane which is separated by an insulating material layer , opposite a surface coil, which is connected to a supply unit for generating high-voltage pulses.

Eine Stoßwellenquelle dieser Art wird z.B. zur Zertrümmerung von Nierensteinen verwendet. Hierzu ist im Stoßwellenrohr eine akustische Linse angeordnet, die die mit Hilfe der Flächenspule und der Membran erzeugten Stoßwellen auf einen Fokus bündelt, in dem der Nierenstein angeordnet wird. Die durch Zertrümmerung erzeugten Teilchen des Nierensteines gehen auf natürlichem Weg ab.A shock wave source of this type is e.g. used to crush kidney stones. For this purpose, an acoustic lens is arranged in the shock wave tube, which bundles the shock waves generated with the aid of the surface coil and the membrane onto a focus in which the kidney stone is arranged. The particles of the kidney stone created by crushing go off naturally.

Bei einer bekannten, in der EP-A-0 133 665 beschriebenen Stoßwellenquelle ist die Flächenspule von einer spiraligen Wicklung gebildet, deren eines Ende geerdet ist. Die aus Metall bestehende, gegenüberliegende Membran ist ebenfalls geerdet. Wird an die Flächenspule ein Hochspannungsimpuls angelegt, so wird die Membran aufgrund der dadurch erzeugten Wirbelströme magnetisch abgestoßen und erzeugt eine zunächst ebene Stoßwelle in der Flüssigkeit im Stoßwellenrohr, die durch eine akustische Linse auf den Fokus gebündelt wird. Die Spannung zwischen dem hochspannungsseitigen Spulenende und der Membran ist dabei gleich dem Maximalwert der Hochspannung, so daß Überschläge vorkommen können, durch die die Membran zerstört werden kann.In a known shock wave source described in EP-A-0 133 665, the surface coil is formed by a spiral winding, one end of which is grounded. The opposite membrane made of metal is also grounded. If a high-voltage pulse is applied to the surface coil, the membrane is magnetically repelled due to the eddy currents generated thereby and initially generates a flat shock wave in the liquid in the shock wave tube, which is focused onto the focus by an acoustic lens. The voltage between the high-voltage side coil end and the membrane is equal to the maximum value of the high voltage, so that arcing can occur, through which the membrane can be destroyed.

Der Erfindung liegt die Aufgabe zugrunde, eine Stoßwellenquelle der eingangs genannten Art so auszubilden, daß die Gefahr von Überschlägen zwischen der Flächenspule und der Membran gegenüber dem Stand der Technik verringert ist.The invention has for its object to provide a shock wave source of the type mentioned so that the risk of Arcing between the surface coil and the membrane compared to the prior art is reduced.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß die Membran eine Isolierstoffscheibe aufweist, auf der elektrisch leitfähige Bahnen aufgebracht sind, die derart angeordnet sind, daß bei einem Spannungsüberschlag zwischen der Flächenspule und der Membran außer dem doppelten Abstand der Membran von der Flächenspule auch der Abstand zwischen den elektrisch leitfähigen Bahnen überwunden werden muß. Bei der erfindungsgemäßen Stoßwellenquelle ist die Membran nicht in ihrer Gesamtheit elektrisch leitfähig, sondern weist nur elektrisch leitfähige, voneinander isolierte Bahnen auf. Der gesamte Weg, der bei einem Überschlag überwunden werden müßte, umfaßt somit den doppelten Abstand der elektrisch leitfähigen Bahnen von der Flachspule und zusätzlich die Abstände zwischen den einzelnen leitfähigen Bahnen und ist demgemäß gegenüber dem Stand der Technik wesentlich verlängert.This object is achieved in that the membrane has an insulating disk on which electrically conductive tracks are applied, which are arranged such that in the event of a voltage flashover between the surface coil and the membrane, apart from twice the distance of the membrane from the surface coil, the distance between the electrically conductive tracks must be overcome. In the shock wave source according to the invention, the membrane is not electrically conductive in its entirety, but only has electrically conductive, mutually insulated tracks. The entire path that would have to be overcome in the event of a rollover thus comprises twice the distance between the electrically conductive tracks from the flat coil and additionally the distances between the individual conductive tracks and is accordingly considerably longer than in the prior art.

Gegenüber einer einzigen leitfähigen Bahn, die an sich auch denkbar wäre, weisen mehrere leitfähige Bahnen, wie sie gemäß der Erfindung vorgesehen sind, aber nicht nur den Vorteil eines um die Abstände zwischen den einzelnen leitfähigen Bahnen vergrößerten bei einem Überschlag zu überwindenden Weges, sondern außerdem den Vorteil einer geringeren Masse auf. Demzufolge ist im Falle mehrerer leitfähiger Bahnen zur Beschleunigung der Membran eine geringere Energie erforderlich bzw. ist bei gleicher Energie eine größere Beschleunigung der der Membran und damit ein steilerer Druckanstieg der erzeugten Stoßwelle erzielbar. Ein möglichst steiler Druckanstieg wird deshalb angestrebt, weil Stoßwellen um so besser zur Zertrümmerung von Konkrementen geeignet sind, je steiler der Druckanstieg ist, den sie aufweisen.Compared to a single conductive track, which would also be conceivable in itself, several conductive tracks as provided in accordance with the invention not only have the advantage of a distance to be overcome in the event of a rollover, but also the distance between the individual conductive tracks the advantage of a lower mass. Accordingly, in the case of several conductive paths for accelerating the membrane, less energy is required or, with the same energy, greater acceleration of the membrane and thus a steeper pressure increase of the generated shock wave can be achieved. A steepest possible increase in pressure is sought because shock waves are more suitable for crushing concrements, the steeper the pressure increase they have.

Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Es Zeigen:

Fig. 1
eine Stoßwellenquelle nach der Erfindung, und
Fig. 2
eine Einzelheit der Stoßwellenquelle gemäß Figur 1.
The invention is explained below with reference to an embodiment shown in the drawing. Show it:
Fig. 1
a shock wave source according to the invention, and
Fig. 2
a detail of the shock wave source according to Figure 1.

In der Figur 1 ist ein Stoßwellenrohr 1 dargestellt, das mit Wasser als Koppelmedium gefüllt ist, dessen Druck in nicht dargestellter, bekannter Weise gesteuert werden kann. Die Applikationsseite des Stoßwellenrohres 1 ist von einem elastischen Sack 2 verschlossen. Die gegenüberliegende Seite ist von einer Membran 3 verschlossen. Im Innern des Stoßwellenrohres 1 liegt eine akustische Linse 4 zur Bündelung der Stoßwellen auf einen Fokus. Zwischen der Membran 3 und einer Flächenspule 6, die spiralig gewickelt ist, liegt eine Isolierstoffschicht 7. Das hochspannungsseitige Ende 6a der Flächenspule 6 ist mit einem Hochspannungsgenerator 8 zur Erzeugung von Hochspannungsimpulsen verbindbar, während das andere Ende 6b der Flächenspule 6 geerdet ist.FIG. 1 shows a shock wave tube 1 which is filled with water as the coupling medium, the pressure of which can be controlled in a known manner, not shown. The application side of the shock wave tube 1 is closed by an elastic bag 2. The opposite side is closed by a membrane 3. Inside the shock wave tube 1 there is an acoustic lens 4 for focusing the shock waves on one focus. Between the membrane 3 and a surface coil 6, which is spirally wound, there is an insulating layer 7. The high-voltage side end 6a of the surface coil 6 can be connected to a high-voltage generator 8 for generating high-voltage pulses, while the other end 6b of the surface coil 6 is grounded.

Zur Erzeugung von Stoßwellen werden der Flächenspule 6 Hochspannungsimpulse von z.B. etwa 20 kV zugeführt. Dadurch werden Wirbelströme in der Membran 3 erzeugt, die eine Abstoßung der Membran 3 von der Flächenspule 6 bewirken, wodurch zunächst ebene Stoßwellen in dem Wasser im Stoßwellenrohr 1 erzeugt werden, die dann in der geschilderten Weise durch die akustische Linse 4 gebündelt werden.To generate shock waves, the surface coil is subjected to 6 high-voltage pulses from e.g. about 20 kV supplied. As a result, eddy currents are generated in the membrane 3, which cause the membrane 3 to be repelled by the surface coil 6, as a result of which plane shock waves are first generated in the water in the shock wave tube 1, which are then bundled in the manner described by the acoustic lens 4.

Zur Verminderung der Gefahr von Spannungsüberschlägen zwischen den beiden Spulenenden 6a, 6b, die über die Membran 3 verlaufen würden, ist die Membran 3 gemäß Figur 2 von einer kreisförmigen Isolierstoffscheibe gebildet, auf der elektrisch leitfähige Bahnen 9, 10, 11 beispielsweise aus versilbertem Kupfer aufgebracht sind. Die Bahnen 9, 10 sind als konzentrische Ringe ausgebildet. Die Bahn 1 im Zentrum der Membran 3 ist eine scheibenförmige Auflage aus elektrisch leitfähigem Material auf der Isolierstoffscheibe.In order to reduce the risk of voltage flashovers between the two coil ends 6a, 6b, which would run over the membrane 3, the membrane 3 according to FIG. 2 is formed by a circular insulating disk on which electrically conductive tracks 9, 10, 11, for example made of silver-plated copper, are applied are. The tracks 9, 10 are designed as concentric rings. The web 1 in the center of the membrane 3 is a disk-shaped support made of electrically conductive material on the insulating disk.

Aus der Figur 2 ergibt sich, daß der Weg, der bei einem Überschlag zwischen den beiden Spulenenden 6a, 6b überwunden werden müßte, gleich dem doppelten Abstand zwischen der Membran 3 und der Flächenspule 6, vergrößert um die Abstände zwischen den leitfähigen Bahnen 9, 10, 11, ist. Dieser Weg ist so lang, daß Überschläge praktisch ausgeschlossen sind.From FIG. 2 it follows that the path that would have to be covered in the event of a rollover between the two coil ends 6a, 6b is equal to twice the distance between the membrane 3 and the surface coil 6, increased by the distances between the conductive tracks 9, 10, 11. This path is so long that rollovers are practically impossible.

Claims (2)

  1. Shock wave source for the treatment of calculi in the body of a patient, having a liquid-filled shock wave tube (1), one end of which is sealed by a flexible sack (2) which can be pressed by way of the fluid pressure against the patient, and at the other end of which there is located a membrane (3) which, separated by a layer of insulating material (7), is located opposite a flat coil (6) which is connected to a supply unit (8) for the generation of high voltage pulses, characterised in that the membrane (3) has a disc of insulating material to which there are applied electrically conductive tracks (9, 10, 11) which are arranged in such a way that, during a voltage flashover between the flat coil (6) and the membrane (3), in addition to twice the distance between the membrane (3) and the flat coil (6), the distance between the electrically conductive tracks (9, 10, 11) must also be overcome.
  2. Shock wave source according to claim 1, characterised in that the conductive tracks (9, 10, 11) are formed by concentric rings.
EP87113986A 1986-10-06 1987-09-24 Shock wave generator Expired - Lifetime EP0266538B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8627238U DE8627238U1 (en) 1986-10-06 1986-10-06
DE8627238U 1986-10-06

Publications (2)

Publication Number Publication Date
EP0266538A1 EP0266538A1 (en) 1988-05-11
EP0266538B1 true EP0266538B1 (en) 1991-11-27

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ID=6799143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113986A Expired - Lifetime EP0266538B1 (en) 1986-10-06 1987-09-24 Shock wave generator

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US (1) US4793329A (en)
EP (1) EP0266538B1 (en)
JP (1) JPH045151Y2 (en)
DE (2) DE8627238U1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879993A (en) * 1986-10-29 1989-11-14 Siemens Aktiengesellschaft Shock wave source for generating a short initial pressure pulse
DE8706039U1 (en) * 1987-04-27 1988-08-25 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
DE8709363U1 (en) * 1987-07-07 1988-11-03 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
DE3743822A1 (en) * 1987-12-23 1989-07-13 Dornier Medizintechnik ELECTROMAGNETIC SHAFT SOURCE
US5233972A (en) * 1990-09-27 1993-08-10 Siemens Aktiengesellschaft Shockwave source for acoustic shockwaves
DE4130796A1 (en) * 1990-09-27 1992-04-02 Siemens Ag ELECTRICALLY DRIVABLE SHOCK WAVE SOURCE
DE4032357C1 (en) * 1990-10-12 1992-02-20 Dornier Medizintechnik Gmbh, 8000 Muenchen, De
DE4110102A1 (en) * 1991-03-27 1992-10-01 Siemens Ag Electromagnetically driven pressure pulse source for medical use - has electrically conducting membrane formed as annular array of zones activated by drive coils having variable timings
CN113029495B (en) * 2021-05-31 2021-08-03 中国工程物理研究院流体物理研究所 High Mach shock tube experimental apparatus based on arc discharge driving
CN113925761A (en) * 2021-11-16 2022-01-14 深圳市慧康精密仪器有限公司 Shock wave therapeutic instrument for women

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3312014C2 (en) * 1983-04-02 1985-11-07 Wolfgang Prof. Dr. 7140 Ludwigsburg Eisenmenger Device for the contact-free crushing of concretions in the body of living beings
DE3328051A1 (en) * 1983-08-03 1985-02-14 Siemens AG, 1000 Berlin und 8000 München DEVICE FOR CONTACTLESS CRUSHING OF CONCRETE
DE3443295A1 (en) * 1984-11-28 1986-06-05 Wolfgang Prof. Dr. 7140 Ludwigsburg Eisenmenger DEVICE FOR THE CONTACT-FREE CRUSHING OF CONCRETE IN THE BODY OF LIVING BEINGS
DE3447440A1 (en) * 1984-12-27 1986-07-03 Siemens AG, 1000 Berlin und 8000 München SHOCK SHAFT PIPE FOR THE CRUSHING OF CONCRETE
DE3502751A1 (en) * 1985-01-28 1986-07-31 Siemens AG, 1000 Berlin und 8000 München SHOCK SHAFT PIPE WITH A LONG LIFETIME
DE3505894A1 (en) * 1985-02-20 1986-08-21 Siemens AG, 1000 Berlin und 8000 München Shock wave tube with coil and diaphragm
DE8521196U1 (en) * 1985-07-23 1985-08-29 Eisenmenger, Wolfgang, Prof. Dr., 7140 Ludwigsburg Membrane-coil arrangement of electromagnetic devices for the contact-free crushing of calculus in the body of living beings

Also Published As

Publication number Publication date
JPS6365411U (en) 1988-04-30
EP0266538A1 (en) 1988-05-11
DE8627238U1 (en) 1988-02-04
JPH045151Y2 (en) 1992-02-14
DE3774835D1 (en) 1992-01-09
US4793329A (en) 1988-12-27

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