EP1727125A1 - Méthode et dispositif pour régler un générateur d'ondes de choc - Google Patents

Méthode et dispositif pour régler un générateur d'ondes de choc Download PDF

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Publication number
EP1727125A1
EP1727125A1 EP04028176A EP04028176A EP1727125A1 EP 1727125 A1 EP1727125 A1 EP 1727125A1 EP 04028176 A EP04028176 A EP 04028176A EP 04028176 A EP04028176 A EP 04028176A EP 1727125 A1 EP1727125 A1 EP 1727125A1
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EP
European Patent Office
Prior art keywords
shock wave
shock
variable
wave generating
shock waves
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.)
Withdrawn
Application number
EP04028176A
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German (de)
English (en)
Inventor
Erwin Simnacher
Steffen Strauss
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.)
Sanuwave Inc
Original Assignee
Healthtronics Inc
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Publication date
Application filed by Healthtronics Inc filed Critical Healthtronics Inc
Priority to EP04028176A priority Critical patent/EP1727125A1/fr
Publication of EP1727125A1 publication Critical patent/EP1727125A1/fr
Withdrawn legal-status Critical Current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 relates to a method and a device for controlling a shock wave generating device.
  • Shock wave generating devices are used in human and veterinary medicine for different purposes.
  • One medical application of shock wave generation devices in human medicine is in lithotripsy, where the generated shock waves are focused on internal objects to be destroyed, such as kidney stones.
  • Further applications include, for example, the induction of bone growth, the treatment of orthopedically painful diseases (epicondylitis, calculus shoulder) and the treatment of nerves, muscles and other soft tissue structures.
  • the shock wave generating devices are applied by means of an application surface to the body of a patient to initiate the generated shock waves in the body of a patient.
  • shock wave generating devices In a medical application of the shock wave generating devices must be ensured that the shock wave parameters of the generated acoustic shock waves are within certain limits, which are predetermined for the intended use.
  • the shockwave generating devices are subject to a lifetime wear, which can change the shock wave parameters.
  • the shock waves are generated by a shock wave generating unit in the form of a spark discharge between two electrodes in a liquid medium. Every spark discharge leads thereby at the electrode tips to a loss of material and thus to a larger electrode distance. Depending on the distance between the electrodes, the shock wave parameters may change. At a critical level, a sparkover will be lost at a voltage applied to the electrodes.
  • a method is known from EP 0 911 804 A2, in which a voltage applied to the electrodes and their course are measured, and the distance between the electrodes is corrected on the basis of a deviation from a voltage setpoint.
  • a discharge curve of a spark gap is measured for this purpose and compared with a target value of the discharge curve.
  • a voltage measurement on a high voltage circuit is difficult to perform.
  • Another measuring method is shown in DE 103 11 659 A1.
  • a device is described in which a discharge current between the electrode tips measured, compared with a target value and the distance of the electrodes is corrected according to a deviation of the measured value from the target value. Due to low measurement amplitudes, the measured values of the measurement method described are influenced by electromagnetic interference, which occurs more intensely in the event of a high-voltage discharge. This can lead to a falsification of the measured values and results in an increased risk of incorrect measurements.
  • shockwave parameters of the generated shock waves depend, among other things, on a medium in that they spread. A different quality of the propagation medium influences the parameters of the shock waves. A guarantee of constant shock wave parameters is therefore not given.
  • the aforementioned devices or methods are limited to electro-hydraulic shock wave generating devices.
  • an object of the present invention to provide an apparatus for controlling a shock wave generating device that is simple and inexpensive to manufacture and reliable in use, and that allows direct testing of the shock wave parameters.
  • the essential idea of the invention is to implement an apparatus for controlling a shockwave generating device with at least one shockwave generating unit, a measuring and a control device such that the measuring device has at least one PZT thin-film element which is arranged in a shock wave field in this way in that shock waves strike the at least one PZT thin-film element, and an electrical measured quantity generated by a mechanical deformation of the at least one PZT thin-film element is detected as the parameter of the acting shock wave and used as a measure for a correction step to be carried out with the control device on the unit producing the shock waves becomes.
  • PZT thin films are known from EP 961 02 532. This is a thin layer of lead zirconate titanate, PZT for short. Use find the piezoelectric thin film elements in the printing device industry, especially in use as actuators in ink jet recording devices.
  • a direct piezoelectric effect of the PZT thin-film elements is used for detecting the shock waves.
  • electrical charges are generated on a surface of a piezoelectric thin-film element. These electrical charges are detected as a parameter of the acting shock wave and fed to the control device.
  • the PZT thin-film elements have a very thin layer thickness, which only slightly influences the shock wave amplitudes, while at the same time offering high durability and high sensitivity. This allows the measurement of shock waves in real time, ie during the treatment of patients.
  • the PZT thin-film elements have a good signal-to-noise ratio, that is to say the device according to the invention is less sensitive to disturbances.
  • a measurement takes place outside the high-voltage circuit of the shock wave generating unit. The electrical measurements are less affected by electromagnetic interference.
  • the measuring device can be arranged in the interface between a medium which promotes the shock wave propagation and a coupling membrane for coupling the shock waves into the body of the patient.
  • the measuring device is arranged on a surface of a device for focusing the shock waves.
  • the electrical parameter, as a parameter of the acting pressure amplitude of the shock waves is compared for a judgment with at least one target value of a target value.
  • At least one parameter of the shockwave generating device is set by a control device at a corresponding deviation of the electrical measured variable to the setpoint value of the setpoint variable.
  • the quality of the shock wave parameters in a medical application is kept to an appropriate level.
  • FIG. 1 shows a shock wave generating device 1 which has a unit 2 generating the shock waves and a medium 6 which is suitable for the shock wave transmission and fills a volume between the unit 2 generating the shock waves and a coupling membrane 4.
  • a shock wave transmission medium 6 for example, water is used.
  • the coupling membrane 4 is used for energetically low-loss coupling of the shock wave generating device 1 to a body part to be treated.
  • the device will be described using the example of an electro-hydraulic shock wave generation. Further generation principles of the shock waves are not excluded in connection with the device according to the invention.
  • the shock waves are generated by the shock wave generating unit 2 and extend in the direction of the coupling membrane 4.
  • the generated shock waves are bundled in a shock wave focus 12 based on a means 10 suitable for focusing the shock waves, for example on the basis of the predetermined geometry of an ellipsoid.
  • the shock wave focus 12 is the area with the highest pressure.
  • a measuring device 8 consisting of at least one PZT thin-film element 26, which is constructed from a PZT thin film applied to a carrier material, is arranged in the interface between the medium 6 and the coupling membrane 4 favoring the shock wave propagation.
  • the measuring device 8 is arranged in the shock wave field such that the shock waves can strike the PZT thin-film element 26.
  • the PZT thin-film element 26 of the measuring device 8 is electrically connected to an amplifier unit 14.
  • the electrical measured quantities generated upon impact of the shock waves on the PZT thin-film element 26 of the measuring device 8 enter the amplifier unit 14.
  • the output signal of the amplifier unit 14 is fed to an analog / digital unit 16 whose digital output data are passed to an evaluation unit 18 of a control device 22.
  • the output data of the analog / digital unit 16 are compared with a setpoint value of a setpoint variable of a reference unit 20 and at least one characteristic variable of the acting shock waves is determined. Following this, a correction step which is dependent on a deviation of the electrical measured value from the nominal value of the setpoint variable is carried out with a control device 22, not shown in more detail.
  • the control device 22 corrects an electrode spacing, which increases in the event of spark discharges between two electrodes due to material loss. One or both electrodes are automatically readjusted by the control device 22 until the shockwave parameters are again in the range required for the application.
  • the measuring device 8 is arranged on a surface of a device for focusing the shock waves 10.
  • the at least one PZT thin-layer element 26 of the measuring device 8 can be adhesively bonded to the surface of the device for focusing the shock waves 10 or else can be inserted in a recess provided for this purpose. Further positioning options are not excluded.
  • a regulation of the shockwave generating device 1 takes place in the following way:
  • the evaluation unit 18 of the control device 22 is set in a defined initial state.
  • shock waves are generated by the shock wave generating unit 2, which propagate in the medium suitable for the shock wave propagation 6 and are focused by means suitable for focusing the shock waves means 10 in the shock wave focus 12.
  • the shock waves strike the at least one PZT thin-film element 26 of the measuring device 8, which is arranged in the interface between the medium 6 promoting the shock wave propagation and the coupling membrane 4 for coupling the shock waves into the body of the patient.
  • the electrical measured quantities generated by the action of the shock waves are detected as a parameter of the acting shock waves and compared and evaluated in the evaluation unit 18 with the at least one desired value of the reference variable of the reference unit 20.
  • a correction step is carried out on the shockwave generating unit 2 by means of the control device 22. It is corrected by the controller 22, the electrode spacing, which increases in the spark discharges due to loss of material until the shock wave parameters are again in the required range for the application.
  • the parameters The shock waves are continuously recorded with the measuring device 8, as described above, and evaluated in the evaluation unit 18.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Surgical Instruments (AREA)
EP04028176A 2004-11-26 2004-11-26 Méthode et dispositif pour régler un générateur d'ondes de choc Withdrawn EP1727125A1 (fr)

Priority Applications (1)

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EP04028176A EP1727125A1 (fr) 2004-11-26 2004-11-26 Méthode et dispositif pour régler un générateur d'ondes de choc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04028176A EP1727125A1 (fr) 2004-11-26 2004-11-26 Méthode et dispositif pour régler un générateur d'ondes de choc

Publications (1)

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EP1727125A1 true EP1727125A1 (fr) 2006-11-29

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EP04028176A Withdrawn EP1727125A1 (fr) 2004-11-26 2004-11-26 Méthode et dispositif pour régler un générateur d'ondes de choc

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116687514A (zh) * 2023-05-26 2023-09-05 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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0256202A2 (fr) * 1986-08-18 1988-02-24 Siemens Aktiengesellschaft Corps de couplage pour un dispositif thérapeutique utilisant des ondes de choc
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.
US5109338A (en) * 1988-09-23 1992-04-28 Siemens Aktiengesellschaft High-voltage generator and method for generating a high current, high-voltage pulse by pulse shaping for driving a shock wave source
EP0911804A2 (fr) 1997-10-24 1999-04-28 MTS Medical Technologies & Services GmbH Procédé pour l'ajustement automatique de la distance entre les électrodes d'un éclateur dans un dispositif d'ondes de choc électrohydraulique
JP2004265900A (ja) * 2003-01-22 2004-09-24 National Institute Of Advanced Industrial & Technology 圧電素子およびその製造方法
DE10311659A1 (de) 2003-03-14 2004-09-30 Sws Shock Wave Systems Ag Vorrichtung und Verfahren zur optimierten elektrohydralischen Druckpulserzeugung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0256202A2 (fr) * 1986-08-18 1988-02-24 Siemens Aktiengesellschaft Corps de couplage pour un dispositif thérapeutique utilisant des ondes de choc
US5109338A (en) * 1988-09-23 1992-04-28 Siemens Aktiengesellschaft High-voltage generator and method for generating a high current, high-voltage pulse by pulse shaping for driving a shock wave source
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.
EP0911804A2 (fr) 1997-10-24 1999-04-28 MTS Medical Technologies & Services GmbH Procédé pour l'ajustement automatique de la distance entre les électrodes d'un éclateur dans un dispositif d'ondes de choc électrohydraulique
JP2004265900A (ja) * 2003-01-22 2004-09-24 National Institute Of Advanced Industrial & Technology 圧電素子およびその製造方法
DE10311659A1 (de) 2003-03-14 2004-09-30 Sws Shock Wave Systems Ag Vorrichtung und Verfahren zur optimierten elektrohydralischen Druckpulserzeugung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE INSPEC THE INSTITUTION OF ELECTRICAL ENGINEERS, STEVENAGE, GB; 12 March 2003 (2003-03-12), POLCAWICH R G ET AL: "Design and fabrication of a lead zirconate titanate (PZT) thin film acoustic sensor" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116687514A (zh) * 2023-05-26 2023-09-05 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

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