EP0242237B1 - Gerät zum Hervorschieben eines Elektrodenträgers in einem Stosswellenerzeuger - Google Patents

Gerät zum Hervorschieben eines Elektrodenträgers in einem Stosswellenerzeuger Download PDF

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Publication number
EP0242237B1
EP0242237B1 EP87400153A EP87400153A EP0242237B1 EP 0242237 B1 EP0242237 B1 EP 0242237B1 EP 87400153 A EP87400153 A EP 87400153A EP 87400153 A EP87400153 A EP 87400153A EP 0242237 B1 EP0242237 B1 EP 0242237B1
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EP
European Patent Office
Prior art keywords
electrode
wheel
holder element
insulating support
rotation
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
EP87400153A
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English (en)
French (fr)
Other versions
EP0242237A1 (de
Inventor
Bernard Lacruche
Jean-Louis Mestas
Dominique Cathignol
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.)
Institut National de la Sante et de la Recherche Medicale INSERM
Technomed International SA
Original Assignee
Institut National de la Sante et de la Recherche Medicale INSERM
Technomed International SA
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Filing date
Publication date
Priority claimed from FR8601380A external-priority patent/FR2593382B1/fr
Application filed by Institut National de la Sante et de la Recherche Medicale INSERM, Technomed International SA filed Critical Institut National de la Sante et de la Recherche Medicale INSERM
Priority to AT87400153T priority Critical patent/ATE69519T1/de
Publication of EP0242237A1 publication Critical patent/EP0242237A1/de
Application granted granted Critical
Publication of EP0242237B1 publication Critical patent/EP0242237B1/de
Anticipated expiration legal-status Critical
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
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/04—Sound-producing devices
    • G10K15/06—Sound-producing devices using electric discharge

Definitions

  • the invention essentially relates to a device for advancing an electrode-carrying element comprising a wheel controlled by pistons, and its use in an apparatus generating pulses for the destruction of targets such as tissues, concretions, in particular renal lithiasis , biliary.
  • US Pat. No. 2,559,227 discloses an apparatus for generating high frequency shock waves, comprising a truncated ellipsoidal reflector 80 for reflecting shock waves, comprising a cavity 81 constituting a chamber for reflecting said shock waves. shock of the same truncated ellipsoidal shape, one of the two foci of the ellipsoid is disposed in said chamber opposite the truncated part, said chamber being repolished with a liquid for transmitting shock waves 83, for example an oil; a shock wave generating device, usually comprising two electrodes 12, 13, is arranged at least partially inside said chamber 81, with said two electrodes arranged to generate a discharge or electric arc at said focal point located in said chamber opposite the truncated part, and means 10, 11 are provided for selectively instantaneously supplying an electrical voltage to said two electrodes 12, 13 causing said discharge or electric arc between said electrodes, thereby generating said shock waves in said contained liquid in said chamber (see FIG. 3 and column 7,
  • the electrodes 12 and 13 are made of highly conductive material such as copper or brass and are mounted on an insulator 26 which is pivotally supported by means of a device 11a, 11b, so as to adjust the spacing between them (see column 4, lines 42 to 53 and column 8, lines 40 to 47).
  • Document FR-A-2 247 195 also describes a similar device in which the liquid consists of water (page 3, lines 23-24).
  • the production of the support and advancement structure of the electrodes is relatively complicated and of high cost.
  • the element 56 is welded to the flared part 50 forming the electrode holder of the electrode 36. This assembly is therefore not removable.
  • the electrodes are controlled simultaneously, which is a drawback in practice due to the different wear of each electrode.
  • the present invention therefore aims to solve the new technical problem of providing a solution for advancing electrodes with very high accuracy, thereby concomitantly increasing the efficiency of destruction of targets.
  • the invention must also allow independent control of each electrode.
  • This new technical problem is solved for the first time by the present invention by providing a solution of a relatively low cost while increasing the number of destroyed targets such as tissues, concretions, such as kidney stones, gallstones, etc. by improving positioning accuracy.
  • the present invention provides a device for advancing an electrode-carrying element in particular in an apparatus generating pulses or shock waves comprising a reflector, in particular an ellipsoidal reflector comprising a cavity for reflecting pulses or shock waves.
  • said electrode-carrying element being mounted displaceable in an insulating support fixed to the wall of the reflector, in particular ellipsoidal and being formed by a rod arranged in a cylindrical cavity of the insulating support, by being displaceable in axial translation ;
  • said advancement device comprising a radially projecting element integral with an intermediate or rear part of the electrode-carrying element constituting a type of wheel provided at its periphery with means for rotation by a control member, said wheel being controlled in rotation by said control member acting on said means for rotating, said wheel comprising a central coaxial through hole through which the electrode-carrying element passes, characterized in that said electrode-carrying element is rotationally integral but movable in translation relative to said wheel which is of fixed
  • the through hole of the wheel has a non-circular section, advantageously polygonal, the electrode-carrying element also comprising a part of corresponding external section at the level of said wheel.
  • the aforementioned wheel is disposed inside a cavity provided in the support insulating, the wheel is mounted on an intermediate part of the electrode holder element.
  • the aforementioned means for rotating the wheel consist of teeth;
  • the control member comprises at least one piston displaceable in translation in a plane perpendicular to the axis of translation of the electrode-carrying element and passing through the plane of said teeth of the wheel in order to be able to act on a tooth.
  • the control member comprises two pistons mounted symmetrically on either side of the wheel to control the wheel in both directions of rotation, that is to say either to advance the electrode, or to move back the electrode, the wheel then comprising two teeth advantageously arranged over the entire circumference of the wheel.
  • the threaded part of the electrode-holder element is located at the rear end of the electrode-holder element
  • the insulating support is produced in two removable parts, a first part constituting the main part of the insulating support and comprising in particular the cavity in which the aforementioned wheel is disposed, and a second part serving to close the cavity comprising a threaded orifice in which the threaded part of the rear end of the electrode holder element is screwed.
  • the wheel comprises at the front a cylindrical shoulder which is received in a countersink of the insulating support, and at the rear said wheel comprises a means for holding in a fixed axial position, such as a system of circlips or key.
  • the electrode is advantageously fixed to an intermediate electrode-carrying element which comes to fit by a nesting system such as a dovetail on the electrode-carrying element.
  • the invention also includes devices generating pulses or shock waves for the destruction of targets such as tissues, concretions, in particular renal and biliary lithiasis, comprising such a device for advancing the carrier element. -electrode.
  • a advancement device identified by the general reference number 100, is here incorporated in an apparatus for generating high frequency shock waves of the type generally described by RIEBER in the US Patent No. 2,559,227, in particular with reference to Figures 1 to 3.
  • this device comprises a truncated ellipsoidal reflector 101 arranged vertically, comprising a cavity 102 constituting a shock wave reflection chamber, of the same truncated ellipsoidal shape.
  • the advancement device 100 is used for advancing an electrode-carrying element 109 supporting the actual electrode 108.
  • the electrode-carrying element 109 is mounted displaceable in an insulating support 112 fixed on the wall of the ellipsoidal reflector 101 by suitable fixing means 113, in a removable manner.
  • the electrode-carrying element 109 is formed by a rod arranged in a cavity of substantially cylindrical shape 113 of the insulating support 112, preferably coaxial of the insulating support, by being displaceable in axial translation.
  • the insulating support 112 therefore also has a front part 112c also having the shape of a rod which was originally solid and in which a hole has been made defining the cavity 113.
  • the front part of the rod forming the insulating support 112 has also been drilled and has an orifice 115 of diameter substantially equal to the diameter of the electrode 108, so as to serve as a guide and for holding the electrode.
  • the electrode 108 can be secured by brazing or equivalent means in a housing 118 of an intermediate electrode-carrying element also constituted by a rod 119 projecting from this housing 118.
  • This intermediate element 119 is in turn detachably secured to the electrode-carrying element 109.
  • the intermediate electrode-carrying element 119 is made of an electrically conductive material.
  • the electrode-carrying element 109 and the intermediate electrode-carrying element 119 are made of brass.
  • the electrodes can be made of metals or alloys with a high melting point, advantageously tungsten, preferably thoriated tungsten, the content of thorium oxide of which is advantageously of the order of 4%.
  • the advancement device 100 of the electrode-carrying element 109 comprises a radially projecting element 124 secured to the rear part 109b of the electrode-carrying element 109, and a control member thereof which can be seen. well in figure 3.
  • the radially projecting element 124 is formed by a wheel 160 provided at its periphery with means 162 for rotating, said wheel 160 being controlled in rotation by the control member 134 acting on the setting means rotation 162.
  • the wheel 160 is made removable with respect to the electrode-carrying element 109.
  • the wheel 160 thus comprises a central through hole 164 coaxial through which the electrode-carrying element 109 passes, as is clearly visible in the figures.
  • the electrode-carrying element 109 is integral in rotation with the wheel 160 but displaceable in translation relative to the wheel 160 which is in fixed axial position relative to the insulating support 112.
  • the through hole 164 of the wheel 160 has a non-circular section, advantageously polygonal, for example square as shown in the figures, the electrode-carrying element 109 also comprising a part 109c of corresponding external section, therefore here square, at the level of the wheel 160, so as to allow the connection in rotation but the displacement in translation of the electrode-carrying element 109.
  • the electrode-carrying element 109 also comprises a threaded part 109d cooperating with a corresponding threaded part 170 of the insulating support 112, by forming a screw-nut system.
  • the wheel 160 is disposed inside a second cavity 172 provided in the insulating support 112.
  • the wheel 160 is mounted on an intermediate portion 109c of the electrode-carrying element.
  • the threaded part 109d of the electrode-holder element is located at the rear end of said electrode-holder element, the insulating support 112 is produced in two removable parts respectively 112a, 112b.
  • the first part 112a constitutes the main part of the insulating support and comprises in particular the cavity 172 in which the wheel 160 is arranged, and the second part 112b serves to close off the cavity 172 and comprises a threaded orifice 174 in which the threaded part is screwed 109d from the rear end of the electrode-carrying element 109 and which constitutes a screw.
  • the wheel 160 comprises at the front a cylindrical shoulder 176, here shown of reduced section, which is received in a counterbore 178 of the insulating support 112; and at the rear, means 180 for holding the fixed axial position of the wheel 160, for example a system of circlips, as shown, or of a key, clipping into an annular notch 182 of the wall of the insulating support 112 defining the cavity 172.
  • the means 162 for rotating the wheel consist of teeth.
  • control member 134 comprises at least one piston 184 displaceable in translation in a plane perpendicular to the axis of translation of the electrode-carrying element and passing through the plane of said teeth 162 of the wheel 160 in order to be able to come act on a tooth, as shown on the right side of Figure 3.
  • the control member 134 comprises two pistons 184, 184 ′ mounted symmetrically on either side of the wheel 160 to control the wheel 160 in both directions of rotation, that is to say either to achieve a movement of advancement of the electrode-carrying element and therefore of the electrode, that is to make a withdrawal.
  • the wheel 160 comprises two teeth 160a, 160b arranged over the entire circumference of the wheel 160, in an opposite direction, for example each over a half thickness. It is also possible to provide for the teeth to be axially offset and then the pistons will be mounted offset on either side of the wheel 160.
  • pistons 184, 184 ′ are also arranged in suitable housings 186, 186 ′ of the insulating support. These pistons can be controlled by hydraulic control, the piston tending to be pushed against the pressure applied by the hydraulic fluid by the presence of a spring 188, 188 ′ or the like.
  • the front end 184a, 184 ′ a of the piston 184, 184 ′ is provided with an element 190, 190 ′ forming a pawl mounted in rotation about an axis 192, 192 ′ parallel to the axis of translation of the electrode holder 109.
  • the piston 184, 184 ′ comprises anti-rotation means constituted by a groove 196, 196 ′ cooperating with a guide pin 198, 198 ′.
  • the electrode 108 is fixed to an intermediate electrode-carrying element 119 coming from fit by a dovetail fitting system 200 on the electrode-carrying element 109. This allows very easy disassembly of the electrode 108 with its intermediate electrode-carrying element 119.
  • the electrode 108 When the electrode 108 is mounted on an ellipsoidal reflector, or another device generating pulses or shock waves, naturally at least two electrodes are present as described in RIEBER US 2,559,227, RF-2,247,195 or EP -124,682.
  • each of the two electrodes is identical, the electrodes being arranged in the extension of one another and being concurrent with the internal focus of the ellipsoidal reflector.
  • the control of each electrode is carried out using the advancement device according to the present invention, is therefore independent and can be adjusted with great precision.
  • the arrival of electric current from the current source is carried out by a conductor 202 leading to an electrically conductive element 204 in permanent sliding contact on the electrode-carrying element 109 also electrically conductive, to provide a sliding electrical contact.
  • the control of the pistons can be automated without difficulty.
  • This blocking or brake can be carried out on an axial portion or extension of the wheel 160.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Surgical Instruments (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Discharge Heating (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Measuring Fluid Pressure (AREA)

Claims (11)

1. Vorrichtung (100) zum Vorrücken eines Elektroden-Trägerelements, insbesondere in einem Impulsoder Stoßwellenerzeuger, der einen insbesonders ellipsoidischen Reflektor aufweist, mit einem Hohlraum zum Reflektieren der Impulse oder Stoßwellen in Richtung eines Zielobjekts, wobei das genannte Elektroden-Trägerelement (109) in einem isolierenden Träger (112) beweglich angeordnet ist, der an einer Seitenwand des Reflektors (101), der insbesonders ellipsoidisch ist, und durch eine Stange gebildet wird, die in einem zylindrischen Hohlraum (113) des isolierenden Trägers angeordnet ist, wobei sie in Axialrichtung verschiebbar ist; wobei die Vorrichtung zum Vorrücken (100) ein radial vorspringendes Element (124) aufweist, das mit einem Zwischen- oder hinteren Bereich des Elektroden-Trägerelements (109) verbunden ist, unter Bildung einer Art von Rad (160), das an seinem Umfang mit Einrichtungen (162, 162′) zum Indrehungversetzen durch ein Steuerorgan (134) versehen ist, wobei das genannte Rad (160) durch das Steuerorgan (134) in Drehung versetzt wird, das auf die genannten Einrichtungen (162, 162′) zum Indrehungversetzen wirkt, wobei das genannte Rad (160) eine koaxiale Durchgangsöffnung (164) aufweist, durch die das Elektroden-Trägerelement (109) hindurchgeht, dadurch gekennzeichnet, daß das Elektroden-Trägerelement mit dem genannten Rad (160) drehfest, jedoch in Translation bewegbar ist, das eine feste axiale Stellung bezüglich des isolierenden Trägers (112) aufweist, wobei das Elektroden-Trägerelement (109) ebenfalls einen Gewin debereich (109d) aufweist, der mit einem entsprechenden Gewindebereich (170) des isolierenden Trägers (112) zusammenwirkt, unter Bildung somit eines Systems Schraube-Mutter, was die Translationsbewung des Elektroden-Trägerelements (109) unter der Einwirkung einer Drehung des Rades (160) ermöglicht, wobei das Rad (160) somit entferbar bezüglich des Elektroden-Trägerelements (109) ausgebildet ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Durchgangsöffnung (164) des Rades (160) einen nicht kreisförmigen, vorteilhafterweise polygonalen Querschnitt aufweist, wobei das Elektroden-Trägerelement (109) ebenfalls einen Bereich (109c) von auf der Höhe des genannten Rades (160) entsprechendem Querschnitt aufweist.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das vorgenannte Rad (160) im Inneren eines zweiten Hohlraumes (172) angeordnet ist, der in dem isolierenden Träger (112) vorgesehen ist, wobei das Rad (160) in einem Mittenbereich des Elektroden-Trägerelements (109) angeordnet ist.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Einrichtungen (162) zum Indrehungversetzen des Rades (160) aus Zähnen gebildet sind, das Steuerorgarn (134) wenigstens einen Kolben (184, 184′) aufweist, der in einer zur Verschiebungsachse des Elektroden-Trägerelements (109) senkrechten Ebene verschiebbar ist und durch die Ebene der genannten Zähne (162) des Rades (160) geht, um auf einen Zahn wirken zu können.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß sie zwei Kolben (184, 184′) aufweist, die symmetrisch zu beiden Seiten des Rades (160) zur Betätigung des Rades (160) in die beiden Drehrichtungen angeordnet sind; wobei das Rad (160) vorteilhafterweise zwei Zahnreihen auf dem gesamten Umfang des Rades aufweist.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Gewindebereich (109d) des Elektroden-Trägerelements (109) am hinteren Ende des Elektroden-Trägerelements (109) angeordnet ist, der isolierende Träger (112) aus zwei entfernbaren Bereichen (112a, 112b) gebildet ist, wobei der erste Bereich (112a) den Hauptbereich des isolierenden Trägers (112) bildet und insbesonders den zweiten Hohlraum (172) aufweist, in den das vorgenannte Rad (160) angeordnet ist, und wobei ein zweiter Bereich (112b) dazu dient, den zweiten Hohlraum (172) zu verschließen und eine Gewindeöffnung (172) aufweist, in der der Gewindebereich (109d) des hinteren Endes des Elektroden-Trägerelements (109) eingeschraubt wird.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Rad (160) vorne eine zylindrische Schulter (176) aufweist, die in einer Vertiefung (178) des isoliernden Trägers (112) aufgenommen wird, und hinten Einrichtungen (180) zum Halten des Rades (160) in fester axialer Position bezüglich des isolierenden Trägers aufweist.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurchgekennzeichnet, daß die Elektrode (108) an einem Zwischen-Elektroden-Trägerelement (119) befestigt ist, das durch ein Ineinandergreifsystem (200), wie einem Schwalbenschwanz, in das Elektroden-Trägerelement eingreift.
9. Vorrichtung nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, daß das vordere Ende des Kolbens (184, 184′) mit einem eine Klinke (192) bildenden Element versehen ist, das drehbar um eine Achse parallel zur Translationsachse des Elektroden-Trägerelements (109) angeordnet ist.
10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß sie ein elektrisch leitendes Element (204) aufweist, in gleitender ständiger Anlage auf dem Elektroden-Trägerelement (109), um einen elektrischen Gleitkontakt zu liefern.
11. Impuls- oder Stoßwellenerzeuger zur Zerstörüng von Zielobjekten, wie Geweben, Konkrementen, insbesonders Nieren-, Gallensteinen, dadurch gekennzeichnet, daß sie wenigstens eine Vorrichtung zum Vorrücken eines Elektroden-Trägerelements aufweist, wie dies nach einem der Ansprüche 1 bis 10 definiert ist.
EP87400153A 1986-01-31 1987-01-23 Gerät zum Hervorschieben eines Elektrodenträgers in einem Stosswellenerzeuger Expired - Lifetime EP0242237B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87400153T ATE69519T1 (de) 1986-01-31 1987-01-23 Geraet zum hervorschieben eines elektrodentraegers in einem stosswellenerzeuger.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8601380A FR2593382B1 (fr) 1986-01-31 1986-01-31 Appareil generateur d'ondes de choc de frequence elevee et son utilisation pour la destruction de cibles telles que des tissus, concretions, notamment des calculs renaux, bilaires
FR8601380 1986-01-31
FR868606318A FR2598074B2 (fr) 1986-01-31 1986-04-30 Dispositif d'avancement d'un element porte-electrode comportant une roue commandee par pistons, et son utilisation dans un appareil generateur d'impulsions pour la destruction de cibles telles que des tissus, concretions, notamment des lithiases renales, biliaires
FR8606318 1986-04-30

Publications (2)

Publication Number Publication Date
EP0242237A1 EP0242237A1 (de) 1987-10-21
EP0242237B1 true EP0242237B1 (de) 1991-11-13

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EP87400153A Expired - Lifetime EP0242237B1 (de) 1986-01-31 1987-01-23 Gerät zum Hervorschieben eines Elektrodenträgers in einem Stosswellenerzeuger

Country Status (7)

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US (2) US4730614A (de)
EP (1) EP0242237B1 (de)
AT (1) ATE69519T1 (de)
DE (2) DE3774470D1 (de)
ES (1) ES2028105T3 (de)
FR (1) FR2598074B2 (de)
GR (1) GR3003370T3 (de)

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FR2610454B1 (fr) * 1987-01-29 1989-06-09 Technomed Int Sa Dispositif assurant un contact electrique ameliore entre un conducteur electrique et une electrode ou un element porte-electrode; utilisation de ce dispositif dans tout dispositif d'avancement d'une electrode ou d'un element porte-electrode
FR2612345A1 (fr) * 1987-03-09 1988-09-16 Technomed Int Sa Procede et dispositif de detection et de correction de la position d'electrodes notamment utilisees dans des appareils de generation d'ondes de choc utilisant un doigt palpeur amene au point focal en particulier constitue par la tige d'un verin
FR2623080A1 (fr) * 1987-11-16 1989-05-19 Technomed Int Sa Procede de fabrication d'un dispositif generateur d'ondes de choc indolores et dispositif et appareil ainsi fabriques
US4905674A (en) * 1988-12-01 1990-03-06 Northgate Research, Inc. Electrode construction for replacement of worn electrodes in a lithotripter
US4934353A (en) * 1989-10-02 1990-06-19 Christopher Nowacki Lithotripter having rotatable valve for removal of electrode structure
US5032717A (en) * 1989-10-04 1991-07-16 The United States Of America As Represented By The United States Department Of Energy Remote control for anode-cathode adjustment
FR2663531A1 (fr) * 1990-06-20 1991-12-27 Technomed Int Sa Procede de controle de l'efficacite d'ondes de pression emises par un generateur d'ondes de pression, des procedes de reglage en comportant application, ainsi qu'un appareil de controle d'efficacite d'ondes de pression, pour sa mise en óoeuvre.
DE59814001D1 (de) 1997-10-24 2007-06-21 Mts Europ Gmbh Methode zur automatischen Einstellung des Elektrodenabstandes einer Funkenstrecke bei elektrohydraulischen Stosswellensystemen
US20040097996A1 (en) 1999-10-05 2004-05-20 Omnisonics Medical Technologies, Inc. Apparatus and method of removing occlusions using an ultrasonic medical device operating in a transverse mode
US6520663B1 (en) 2000-03-23 2003-02-18 Henkel Loctite Corporation UV curing lamp assembly
US7794414B2 (en) 2004-02-09 2010-09-14 Emigrant Bank, N.A. Apparatus and method for an ultrasonic medical device operating in torsional and transverse modes
US7008429B2 (en) * 2004-06-23 2006-03-07 Golobek Donald D Bio-absorbable bone tie with convex head
WO2009128061A2 (en) * 2008-04-14 2009-10-22 Avner Spector Automatic adjustable voltage to stabilize pressure for shockwave medical therapy device
EP3117784B1 (de) 2009-07-08 2018-12-26 Sanuwave, Inc. Verwendung der intrakorporalen druckschockwellen in der medizin
GB2480455B (en) * 2010-05-18 2012-10-10 Megger Instr Ltd High voltage liquid dielectric test vessel

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US2559227A (en) * 1947-05-24 1951-07-03 Interval Instr Inc Shock wave generator
GB719296A (en) * 1950-02-09 1954-12-01 Fruengel Frank Stroboscopic light source
US3725729A (en) * 1971-10-29 1973-04-03 Us Army Electrical crowbar system with novel triggered spark gap devices
CH574734A5 (de) * 1973-10-12 1976-04-30 Dornier System Gmbh
DE3316837C2 (de) * 1983-05-07 1986-06-26 Dornier System Gmbh, 7990 Friedrichshafen Einrichtung zur Erzeugung von Stoßwellen mittels einer Funkenstrecke für die berührungsfreie Zertrümmerung von Konkrementen in Körpern von Lebewesen

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Publication number Publication date
ATE69519T1 (de) 1991-11-15
US4730614A (en) 1988-03-15
GR3003370T3 (en) 1993-02-17
EP0242237A1 (de) 1987-10-21
DE3774470D1 (de) 1991-12-19
DE242237T1 (de) 1988-02-25
FR2598074B2 (fr) 1989-10-13
ES2028105T3 (es) 1992-07-01
US4866330A (en) 1989-09-12
FR2598074A2 (fr) 1987-11-06

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