EP0349915B1 - Verfahren und Vorrichtung zum Anpassen der Funkenstrecke eines berührungsfreien Lithotriptors - Google Patents

Verfahren und Vorrichtung zum Anpassen der Funkenstrecke eines berührungsfreien Lithotriptors Download PDF

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Publication number
EP0349915B1
EP0349915B1 EP19890111918 EP89111918A EP0349915B1 EP 0349915 B1 EP0349915 B1 EP 0349915B1 EP 19890111918 EP19890111918 EP 19890111918 EP 89111918 A EP89111918 A EP 89111918A EP 0349915 B1 EP0349915 B1 EP 0349915B1
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EP
European Patent Office
Prior art keywords
spark gap
tips
electrodes
tip
time interval
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
EP19890111918
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English (en)
French (fr)
Other versions
EP0349915A1 (de
Inventor
Pavel Sunka
Václav RNDr. Babicky
Zbysek Barta
Jiri Mudr. Rndr. Benes
Karel RNDr. Kolácek
Václav Prof. MUDr. Kordac
Cestmir Rndr. Stuka
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.)
Karlova Univerzita v Praze
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Karlova Univerzita v Praze
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Publication of EP0349915A1 publication Critical patent/EP0349915A1/de
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Classifications

    • 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 present invention relates to a method and arrangement for adjusting the position of tips of a spark gap of a generator of shock waves of a non-invasive lithotriptor and to arrangements for execution of said method.
  • Such a lithotriptor is known for example from FR-A-2 593 382.
  • the electrodes of such a device are subject to the passage of impulse currents of high amplitudes required for the generation of shock waves. These currents wear out the tips of the electrodes, thus increasing the length of the spark gap, so that it has to be readjusted frequently.
  • Spark gaps with adjustable tips are as a rule controlled mechanically, the method of their adjustment is, however, an empirical one and depends on the experience of the attendants.
  • the major part of regulation methods bases therefore on the picking-up of distances or positions of tips of the spark gap and is capable to compensate roughly the reduction of electrodes.
  • the change of geometry of the surface of electrodes which substantially influences the distribution of the electric field in the neighbourhood of tips of the spark gap and thus also the magnitude of the arc voltage can however not be taken into account by this method.
  • FR-A-2 593 382 discloses a lithotriptor whose spark gap is continuously readjusted depending on the number of discharges executed and/or the discharge voltage of the spark gap.
  • the time interval from the start of charging or from a charged condition of a functional capacitor of the generator up to the moment of discharge within the aqueous spark gap is determined and basing on this obtained time interval, the adjustment of tips of the spark gap of the generator is accomplished.
  • the respective arrangement for execution of said method comprising two adjustable electrodes has both tips of electrodes situated within a housing provided with slots which determine a spatial angle for propagation of the shock wave, whereby the upper guiding means of the tip of the electrode has a conical shape with an apex angle corresponding to the angle of opening of the reflector.
  • the arrangement can be provided with a mobile tip of the shape of a wire, opposite to which the upper guiding means of the tip of the other electrode of the shape of a cone with an apex angle corresponding to the angle of opening of the reflector is situated.
  • the main advantage of the method according to this invention and of the corresponding arrangement is the prolongation of the life time of the spark gap to a multiple of the life periods of existing spark gaps while securing a good capability of reproduction of individual shocks and thus achieving improvements of efficiency of healing.
  • the spark gap with adjustable tips can be provided with means for picking-up their mutual position, with a proper regulation unit and with a working unit, for instance with an electro-mechanical transducer for adjustment of the position of tips of the spark gap. In case the indication from the pick-up device, determining the position of tips of the spark gap is transmitted to a display, it is possible to regulate the position of tips also manually.
  • the spark gap is designed slidable and against another known arrangement the spark gap is coaxial.
  • Fig. 1 shows the voltage course of a spark gap for shock waves with indicated time intervals utilized for regulation, whereby U indicates the voltage on the spark gap, t the time in ⁇ s, we see that after an impulse charging of the functional capacitor, the voltage is slowly decreasing due to leakage over the resistance of the water of the spark gap. So far the time interval between the start of charging and the discharging over the aqueous spark gap is smaller than t min , the discharge occured prior than the functional capacitor has been sufficiently charged and the distance of electrodes has to be increased. If the time interval between the start of impulse charging and the discharge is larger than t max , corresponding to the variability of the discharge voltage U , or in case no discharge is experienced, the distance of electrodes has to be reduced.
  • the regulation thus proceeds as follows. At the start of charging of the functional capacitor or from another defined condition of charging the time interval up to the moment of discharge is measured within the aqueous spark gap, or up to another moment connected directly to the discharge of the aqueous spark gap. This time information is utilized for an adjustment of the distance of the electrodes. If a short time interval between start of charging and discharging, where no full charging of the functional capacitor took place, the distance of tips of electrodes has to be increased. In case of a long time interval between start of charging and discharging of the spark gap where already a partial discharge of the functional capacitor took place, the distance of tips has to be reduced.
  • the verification examinations have been performed at a capacity of the discharge capacitor 1 ⁇ F at a voltage 10 kV. At these conditions 300 shocks have been needed for crushing a large bilestone.
  • the arrangement for execution of the method according to the present invention as shown in Fig. 2 comprises a reflector 1, to which a functional capacitor 2 is joined.
  • the proper spark gap comprising an upper tip 3 and a lower tip 4, enclosed in a housing 5, which beyond its supporting function also supplies current to the upper tip 3, is situated in the focus of the ellipsoid of the reflector 1.
  • the housing 5 is provided with slots 6 which determine the spatial angle for propagation of shock waves generated by the discharge in the spark gap.
  • the upper guiding means 7 of the tip 3 of the electrode has the shape of a cone with an apex angle corresponding to the angle of opening of the reflector 1.
  • At least one of electrodes of the arrangement is provided with shifting means (not shown).
  • Fig. 3 shows an alternative embodiment of the spark gap.
  • the spark gap is situated in the reflector 1 and comprises a mobile tip 8 of wire shape opposite to which an upper guiding means 7 is situated having a conical shape with an apex angle corresponding to the opening angle of the reflector 1.
  • the mobile tip 8 is provided with a shifting device (not shown).
  • Fig. 2 and 3 operate as follows. After the reflector 1 is filled with water and the patient is brought in contact with its upper part, the place for healing is properly adjusted whereafter between tips 3, 4 a discharge is generated by means of the functional capacitor 2, the power therefrom is transmitted by the focussed shock wave to the place where the healing of the patient has to be performed. In case of wear of the spark gap or of tips 3, 4 respectively, their adjustment is accomplished by the shifting device (not shown).

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

Claims (3)

  1. Verfahren zum Anpassen der Position von Spitzen einer Funkenstrecke eines Stoßwellengenerators für berührungsfreie Lithotripsie,
    dadurch gekennzeichnet,
    daß ein Zeitintervall vom Beginn des Ladens oder von einem Ladezustand eines Funktionskondensators bis zur Entladung der wassergefüllten Funkenstrecke gemessen wird, wonach die Anpassung der Spitzen der Funkenstrecke auf Grundlage des so gemessenen Zeitintervalls durchgeführt wird.
  2. Anordnung zur Durchführung des Verfahrens nach Anspruch 1, mit einem Reflektorellipsoid (1) und zwei beweglichen Elektroden, wobei die durch die Spitzen (3, 4) der Elektroden definierte Funkenstrecke im Fokus des Ellipsoids (1) liegt,
    dadurch gekennzeichnet,
    daß sie ein Mittel zur Bestimmung eines Zeitintervalls vom Beginn des Ladens oder des Ladezustands des Funktionsgenerators bis zur Entladung der wassergefüllten Funkenstrecke umfaßt, daß beide Spitzen (3, 4) der Elektroden in einem im Fokus des Ellipsoids des Reflektors angeordneten Gehäuse eingeschlossen sind, welches Gehäuse (5) mit Schlitzen (6) versehen ist, die einen Raumwinkel definieren, in dem die Stoßwelle sich ausbreitet, daß ein oberes Führungsmittel (7) für die Spitze der Elektrode (3) Kegelform mit einem Scheitelwinkel entsprechend dem Öffnungswinkel des Reflektors (1) hat, und daß wenigstens eine der beiden Elektroden mit einer Verschiebevorrichtung versehen ist.
  3. Anordnung nach Anspruch 2,
    dadurch gekennzeichnet,
    daß sie mit einer beweglichen Spitze (8) in Form eines Drahtes versehen ist, der gegenüber das obere Führungsmittel (7) der Spitze der Elektrode (3) vorgesehen ist, und daß die bewegliche Spitze (8) mit einer Verschiebevorrichtung versehen ist.
EP19890111918 1988-07-01 1989-06-30 Verfahren und Vorrichtung zum Anpassen der Funkenstrecke eines berührungsfreien Lithotriptors Expired - Lifetime EP0349915B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CS884771A CS270064B1 (en) 1988-07-01 1988-07-01 Method of surge generator's spark gap's points regulation for non-invasive lithotrity and device for realization of this method
CS4771/88 1988-07-01

Publications (2)

Publication Number Publication Date
EP0349915A1 EP0349915A1 (de) 1990-01-10
EP0349915B1 true EP0349915B1 (de) 1994-01-19

Family

ID=5391219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890111918 Expired - Lifetime EP0349915B1 (de) 1988-07-01 1989-06-30 Verfahren und Vorrichtung zum Anpassen der Funkenstrecke eines berührungsfreien Lithotriptors

Country Status (4)

Country Link
EP (1) EP0349915B1 (de)
JP (1) JPH02154749A (de)
CS (1) CS270064B1 (de)
DE (1) DE68912424T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007087470A3 (en) * 2006-01-27 2008-01-10 Gen Patent Llc Improved shock wave treatment device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ297145B6 (cs) * 1997-10-24 2006-09-13 Medipool Treuhand- Und Beteiligungsgesellschaft Für Medizintechnik Gmbh Zpusob prizpusobení vzdálenosti elektrod jiskriste v elektrohydraulických systémech s rázovou vlnou
FR2799111B1 (fr) * 1999-10-01 2002-06-28 Internova Int Innovation Appareil lithotriteur
US11509132B2 (en) 2011-09-28 2022-11-22 Ppg Industries Ohio, Inc. Intelligent window heat control system
US10063047B2 (en) 2011-09-28 2018-08-28 Ppg Industries Ohio, Inc. Intelligent window heat control system
CA3050008A1 (en) * 2017-01-17 2018-07-26 Soliton, Inc. Rapid pulse electrohydraulic (eh) shockwave generator apparatus with improved acoustic wavefronts
US11337311B2 (en) 2018-07-06 2022-05-17 Ppg Industries Ohio, Inc. Aircraft window with variable power density heater film
CN116687514B (zh) * 2023-05-26 2024-07-02 索诺利(厦门)医疗科技有限公司 一种能够稳定输出能量的体外碎石机高能发射器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418510A (en) * 1965-11-30 1968-12-24 Navy Usa Triggered spark gap electric arcing device
FR2593382B1 (fr) * 1986-01-31 1989-06-30 Technomed Int Sa 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
CS261485B1 (en) * 1986-10-29 1989-02-10 Jiri Mudr Rndr Benes Device for clinic out-of-body lithotripsy of gall stones

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007087470A3 (en) * 2006-01-27 2008-01-10 Gen Patent Llc Improved shock wave treatment device

Also Published As

Publication number Publication date
CS477188A1 (en) 1989-10-13
DE68912424D1 (de) 1994-03-03
JPH02154749A (ja) 1990-06-14
CS270064B1 (en) 1990-06-13
EP0349915A1 (de) 1990-01-10
DE68912424T2 (de) 1994-05-11

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