EP0321759A2 - Source d'ondes de chocs électromagnétique - Google Patents

Source d'ondes de chocs électromagnétique Download PDF

Info

Publication number
EP0321759A2
EP0321759A2 EP88120217A EP88120217A EP0321759A2 EP 0321759 A2 EP0321759 A2 EP 0321759A2 EP 88120217 A EP88120217 A EP 88120217A EP 88120217 A EP88120217 A EP 88120217A EP 0321759 A2 EP0321759 A2 EP 0321759A2
Authority
EP
European Patent Office
Prior art keywords
membrane
shock wave
wave source
insulation film
copper
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.)
Granted
Application number
EP88120217A
Other languages
German (de)
English (en)
Other versions
EP0321759A3 (en
EP0321759B1 (fr
Inventor
Josef Dipl.-Ing. Katona
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.)
Dornier Medizintechnik GmbH
Original Assignee
Dornier Medizintechnik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dornier Medizintechnik GmbH filed Critical Dornier Medizintechnik GmbH
Publication of EP0321759A2 publication Critical patent/EP0321759A2/fr
Publication of EP0321759A3 publication Critical patent/EP0321759A3/de
Application granted granted Critical
Publication of EP0321759B1 publication Critical patent/EP0321759B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 an electromagnetic shock wave source according to the preamble of claim 1.
  • Electromagnetic shock wave generation is used, among other things, in extracorporeal stone crushing (DE 33 28 066 A) and is also suitable for other therapeutic methods in which shock waves are used.
  • shock tube The construction of a so-called shock tube is described in the magazine "Akustician Beihefte", 1962, Issue 1, pages 158 to 202.
  • a copper membrane is located in front of a flat coil, separated by an insulating film.
  • a tube filled with water connects to this copper membrane.
  • a voltage in the range of 2 - 20 kV By applying a voltage in the range of 2 - 20 kV to the flat coil, a magnetic field is induced in the copper membrane, which causes repulsive forces that push the membrane away from the coil. This creates a flat pressure pulse that becomes a steep shock wave in the water-filled pipe and is available for experiments at the end of the pipe.
  • Such a shock tube is used, for example, for chemical substance tests.
  • the object of the invention is to improve such a shock wave source in such a way that efficiency and service life are increased.
  • the invention has the following advantages: - Efficiency losses due to an earthed copper membrane are avoided. The heating of the overall system is reduced due to the improved efficiency. - The skin effect no longer has a limiting effect on the entire thickness of the highly conductive membrane, as shown in FIG. 2. Nevertheless, several membranes can now be placed one behind the other, the total thickness of which is greater than that of a single membrane. - The potential distribution between the coil and the grounded, final metal membrane becomes more favorable because the membranes in between are isolated from the final metal membrane and therefore assume a certain, lower potential when a high voltage is applied. This increases the lifespan, because the lifespan of the system is determined by the dielectric strength of the insulation layer between the wire coil and the membrane.
  • the insulation layer is subjected to less electrical stress, which means that the service life increases.
  • the highly conductive membrane can be placed directly on the coil, provided the insulation layer between its and the final membrane is made of it is laid. This results in a further improvement in the coupling of the membrane to the wire coil, since the stray field is minimized. - Reduction of eddy current losses.
  • the preferred metals used are stainless steel for the high-strength membrane and copper or silver for the highly conductive membranes.
  • Preferred dimensions are: Noble jet membrane: 0.1 - 0.2 mm Copper membrane: 0.05 - 0.2 mm Insulation film: 0.025 - 0.125 mm
  • any number of combinations are possible in the number and thickness of the insulating foils or the metal membranes. However, a total thickness of up to 1 mm should not be exceeded.
  • the shock wave source according to the invention here consists of a basic body 1, a wire coil 2, an insulation film 3, a copper membrane 4, a further insulation film 5, a second copper membrane 6, a further insulation lation film 7 and a stainless steel membrane 8, which is grounded. Designs with more than two highly conductive metal foils 4, 6 are possible, but not shown.
  • the individual layers are connected to one another in a conventional manner, for example by gluing.
  • the figure shows the shock wave source on a greatly enlarged scale. A total thickness of up to 1.0 mm is realistic.
  • the potential curve U during the application of a high voltage is shown in the lower part of the figure.
  • the coil 2 is at the high potential U0.
  • the stainless steel membrane 8 is at earth potential.
  • the copper membranes 4 and 6 are each at potentials that lie between the value U0 and 0. Within the insulating foils 3, 5 and 7, the potential U falls from the higher value to a lower one.
  • FIG. 2 shows the current density distribution in a 0.2 mm thick copper membrane and the current density distribution in two 0.1 mm thick copper membranes, which are separated by an insulation film. Due to the skin effect, the current density at high frequencies is not evenly distributed over the conductor cross-section. The maximum penetration depth at the frequency used is approx. 0.2 mm.
  • the distribution of the current density is shown schematically in FIG. 2. As can be seen from this, the integral over the current density is larger when using two membranes. This increases the repulsive forces and the amplitude of the pressure pulse generated. In the case of well-conductive membranes whose thicknesses are greater than 0.4 mm, the current density is zero in the inner region. This is not the case with a layered membrane. The distribution of the current density is similar in every membrane.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Surgical Instruments (AREA)
  • Building Environments (AREA)
EP88120217A 1987-12-23 1988-12-03 Source d'ondes de chocs électromagnétique Expired - Lifetime EP0321759B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3743822 1987-12-23
DE19873743822 DE3743822A1 (de) 1987-12-23 1987-12-23 Elektromagnetische stosswellenquelle

Publications (3)

Publication Number Publication Date
EP0321759A2 true EP0321759A2 (fr) 1989-06-28
EP0321759A3 EP0321759A3 (en) 1989-10-04
EP0321759B1 EP0321759B1 (fr) 1994-06-01

Family

ID=6343441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120217A Expired - Lifetime EP0321759B1 (fr) 1987-12-23 1988-12-03 Source d'ondes de chocs électromagnétique

Country Status (5)

Country Link
US (1) US4924858A (fr)
EP (1) EP0321759B1 (fr)
JP (1) JPH0741043B2 (fr)
DE (1) DE3743822A1 (fr)
ES (1) ES2056880T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201139A1 (de) * 1992-01-17 1993-07-22 Siemens Ag Elektromagnetische akustische druckimpulsquelle mit elektrisch leitfaehigen membranmitteln
DE4228963A1 (de) * 1992-08-31 1994-03-03 Siemens Ag Druckimpulsquelle mit kavitationsfest beschichteter Membran

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3907605C2 (de) * 1989-03-09 1996-04-04 Dornier Medizintechnik Stosswellenquelle
DE4130796A1 (de) * 1990-09-27 1992-04-02 Siemens Ag Elektrisch antreibbare stosswellenquelle
US5233972A (en) * 1990-09-27 1993-08-10 Siemens Aktiengesellschaft Shockwave source for acoustic shockwaves
DE4041063A1 (de) * 1990-12-20 1992-06-25 Siemens Ag Vorrichtung zum entfernen von implantierten gelenkprothesen
DE4125088C1 (fr) * 1991-07-29 1992-06-11 Siemens Ag, 8000 Muenchen, De
US7189209B1 (en) 1996-03-29 2007-03-13 Sanuwave, Inc. Method for using acoustic shock waves in the treatment of a diabetic foot ulcer or a pressure sore
US6390995B1 (en) 1997-02-12 2002-05-21 Healthtronics Surgical Services, Inc. Method for using acoustic shock waves in the treatment of medical conditions
DE10160595A1 (de) * 2001-12-10 2003-06-26 Dornier Medtech Holding Int Gmbh Elektromagnetische Stoss- bzw. Druckwellenquelle
DE102004013573B3 (de) * 2004-03-19 2005-09-01 Dornier Medtech Systems Gmbh Elektromagnetischer Wandler zur Erzeugung von Zugimpulsen
DE102004036526B4 (de) * 2004-07-28 2008-06-05 Dornier Medtech Systems Gmbh Stoßwellenquelle und Stoßwellenbehandlungsgerät
CN1878427A (zh) * 2005-06-07 2006-12-13 日本电产鸽株式会社 扬声器
CN1882195A (zh) * 2005-06-07 2006-12-20 日本电产鸽株式会社 扬声器
US9997189B2 (en) * 2016-11-07 2018-06-12 Seagate Technology Llc Three dimensional electric field data storage device utilizing shockwaves and a light source
US10056146B2 (en) 2016-11-07 2018-08-21 Seagate Technology Llc Electric field storage device
US20220072326A1 (en) * 2020-09-10 2022-03-10 Moshe Ein-Gal Combined pulsed electromagnetic field and low intensity shockwave system and method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3447440A1 (de) * 1984-12-27 1986-07-03 Siemens AG, 1000 Berlin und 8000 München Stosswellenrohr fuer die zertruemmerung von konkrementen
DE3505894A1 (de) * 1985-02-20 1986-08-21 Siemens AG, 1000 Berlin und 8000 München Stosswellenrohr mit spule und membran
US4718421A (en) * 1985-08-09 1988-01-12 Siemens Aktiengesellschaft Ultrasound generator
EP0256203A1 (fr) * 1986-06-05 1988-02-24 Siemens Aktiengesellschaft Générateur d'ondes de choc pour désagréger à distance des concrétions dans un organisme vivant
US4796608A (en) * 1986-06-16 1989-01-10 Siemens Aktiengesellschaft Shock wave generator for an apparatus for non-contacting disintegration of calculi in the body of a life form
DE8627238U1 (de) * 1986-10-06 1988-02-04 Siemens AG, 1000 Berlin und 8000 München Stoßwellenquelle
EP0278304A1 (fr) * 1987-02-04 1988-08-17 Siemens Aktiengesellschaft Lithotriteur à moyens de positionnement intégré

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201139A1 (de) * 1992-01-17 1993-07-22 Siemens Ag Elektromagnetische akustische druckimpulsquelle mit elektrisch leitfaehigen membranmitteln
DE4228963A1 (de) * 1992-08-31 1994-03-03 Siemens Ag Druckimpulsquelle mit kavitationsfest beschichteter Membran
DE4228963C2 (de) * 1992-08-31 1998-10-22 Siemens Ag Druckimpulsquelle mit kavitationsfest beschichteter Membran

Also Published As

Publication number Publication date
ES2056880T3 (es) 1994-10-16
DE3743822C2 (fr) 1989-10-12
DE3743822A1 (de) 1989-07-13
US4924858A (en) 1990-05-15
JPH0741043B2 (ja) 1995-05-10
EP0321759A3 (en) 1989-10-04
JPH01280451A (ja) 1989-11-10
EP0321759B1 (fr) 1994-06-01

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