EP0288836B1 - Stosswellengenerator für eine Einrichtung zum berührungslosen Zertrümmern von Konkrementen im Körper eines Lebewesens - Google Patents

Stosswellengenerator für eine Einrichtung zum berührungslosen Zertrümmern von Konkrementen im Körper eines Lebewesens Download PDF

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Publication number
EP0288836B1
EP0288836B1 EP88105999A EP88105999A EP0288836B1 EP 0288836 B1 EP0288836 B1 EP 0288836B1 EP 88105999 A EP88105999 A EP 88105999A EP 88105999 A EP88105999 A EP 88105999A EP 0288836 B1 EP0288836 B1 EP 0288836B1
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EP
European Patent Office
Prior art keywords
membrane
carrier
wave generator
shock wave
flat coil
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
EP88105999A
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German (de)
English (en)
French (fr)
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EP0288836A1 (de
Inventor
Sylvester Dipl.-Ing. Oppelt (Fh)
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
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Publication of EP0288836A1 publication Critical patent/EP0288836A1/de
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Publication of EP0288836B1 publication Critical patent/EP0288836B1/de
Anticipated expiration legal-status Critical
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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 generator for a device for contactless crushing of concrements in the body of a living being, which has a flat coil that can be connected to a high-voltage supply and an opposite, a membrane-filled membrane that has a plate-shaped carrier made of an electrically insulating material and has an electrically conductive section attached to one side of the carrier, the membrane being connected to the housing at the edge of the carrier and the electrically conductive section being insulated from the windings of the flat coil.
  • shock wave generator is described in DE-OS 33 12 014.
  • the shock waves are generated by connecting the coil to the high-voltage supply, which converts one to several kV, e.g. 20 kV, charged capacitor contains.
  • the energy stored in the capacitor then discharges abruptly into the coil, which has the consequence that it builds up a magnetic field extremely quickly.
  • a current is induced in the electrically conductive section of the membrane which is opposite to the current flowing in the coil and consequently generates an opposing magnetic field, under the action of which the membrane, i.e. whose electrically conductive section and the plate-shaped carrier connected to it is moved away from the coil.
  • the so in the with liquid, e.g. Water, filled housing shock wave generated by suitable measures on the concrements located in the body of the living being, e.g. Kidney stones, focuses and causes their destruction.
  • the membrane of the known shock wave generator is on attached to the housing so that it is connected to the housing along the edge of its carrier, the edge of the carrier being firmly clamped.
  • the electrically conductive section of the membrane in the known shock wave generator is annular.
  • the invention has for its object to provide a shock wave generator of the type mentioned in such a way that damage to its membrane due to excessive mechanical stress, voltage flashovers between the membrane and flat coil and cavitation are avoided, so that the membrane has a long service life without this the degree of efficiency in the conversion of electrical energy into impact energy adversely affected.
  • this object is achieved in that the material of the carrier is insensitive to cavitation and in that the carrier is designed to be resilient at least in the region of its edge, the electrically conductive section is electrically insulated from the connections of the flat coil and the membrane is attached to the housing in this way, that the electrically conductive section faces the flat coil.
  • the membrane As a result of the resilient design of the carrier in the region of its edge, the membrane as a whole can move in the direction of the force acting upon it when generating shock waves. Deformations of the membrane resulting from the way in which they are fastened to the housing and the associated excessive mechanical stresses are thus largely avoided in the shock wave generator according to the invention.
  • the membrane therefore has a longer service life than the known shock wave generator.
  • the shock waves generated with the shock wave generator according to the invention can be focused better, since deviations in the shape and the pressure distribution of the shock front caused by deformation of the membrane are avoided from the desired ideal.
  • a further increase in the life of the membrane is achieved in that its electrically conductive section compared to the connections of the Flat coil is electrically insulated.
  • the electrically conductive section with one of the connections of the flat coil is at the same potential, namely, the insulating distance between the flat coil and the electrically conductive section does not correspond to the single, but double the distance between the two, so that the same Distance between the two, the risk of voltage flashovers and thus damage to the membrane is considerably less than in the prior art.
  • this measure enables an increased efficiency in converting electrical energy into impact energy, since the electrically conductive section of the membrane can be arranged closer to the flat coil.
  • the material of the carrier is insensitive to cavitation and the membrane is attached to the housing in such a way that the electrically conductive section faces the flat coil and thus only the side of the carrier with the liquid facing away from the electrically conductive section comes into contact, the risk that the membrane will fail prematurely as a result of pitting caused by the cavitation phenomena is considerably reduced.
  • the carrier is formed from an elastomeric material, in particular rubber. These materials are good insulators and, due to their elastic flexibility, are insensitive to cavitation. In addition, the required elastic flexibility of the support in the region of its edge can be achieved with these materials under certain circumstances without special measures.
  • the carrier can be designed as an overall elastically flexible plate, the thickness of which is dimensioned such that the carrier has the required flexibility in the region of its edge. If desired, the comparatively low stiffness of a membrane formed using such a carrier can be sufficient by using a membrane rigid electrically conductive section can be increased.
  • one embodiment of the invention provides that the electrically conductive section is covered by a metal foil, e.g. can consist of aluminum, is formed.
  • a metal foil e.g. can consist of aluminum
  • Such a membrane is particularly easy to produce, since only a metal foil corresponding to the shape of the electrically conductive section has to be connected to the carrier by gluing or vulcanization.
  • the electrically conductive section is electrically insulated from the housing in addition to the connections of the flat coil. This is of particular importance if the housing with one of the connections of the flat coil at a common potential, e.g. Ground potential, since in such a case the insulation of the electrically conductive section from the connections of the flat coil is ineffective if it is not also electrically insulated from the housing.
  • a common potential e.g. Ground potential
  • the membrane can have a plurality of electrically conductive sections which, for example can be formed in the form of concentric rings.
  • the space located between the membrane and the flat coil can be evacuated. An optimal contact of the membrane on the flat coil is then ensured, which is advantageous with regard to the efficiency of the shock wave generator according to the invention.
  • the shock wave generator according to the invention shown in FIG. 1 has a tubular housing 1, which encloses a space 2 filled with a liquid, which is closed by a membrane 3.
  • a spirally wound flat coil 4 is arranged on an insulator 5, which is accommodated in a cap 6, which is fastened to the housing 1 by means of screws 7.
  • the membrane 3 has a plate-shaped carrier 8 which is formed from an electrically insulating material and on one side of which an electrically conductive section 9 of circular shape is attached, in such a way that it is located in the area of the flat coil 4.
  • the membrane 3 is connected to the housing 1 in that the carrier 8 is held with its edge between the cap 6 and the housing 1 by means of the screws 7.
  • the flat coil 4 is connected to a schematically illustrated high-voltage supply 11 by means of suitable switching means 10. This gives a pulse-like current surge to the flat coil 4, whereby this builds up a magnetic field. At the same time, a current of opposite direction is induced in the electrically conductive section 9, which causes an opposing magnetic field. The membrane 3 is thus abruptly repelled by the flat coil 4, which creates a shock wave in the liquid in the space 2. This is focused with suitable means, not shown, on a concrement to be destroyed in a patient and coupled into the patient's body by a housing 1 on the of the membrane 3 distal end closing flexible bag 12 is pressed against the patient's body.
  • the carrier 8 is made of a material, namely rubber, which is not only a good insulator, but is also insensitive to cavitation.
  • the carrier 8 is formed in its central region 13, to which the electrically conductive section formed as a thin copper disk 9 is attached by vulcanization, from a comparatively hard rubber with a hardness of approximately 90 Shore.
  • the edge 14 of the carrier 8 adjoining the central region 13, on the other hand, is formed from a relatively soft rubber with a hardness of approximately 30 Shore. Since the edge 14 of the carrier 8 is designed to be resilient in comparison to the central region 13 thereof, the central region 13 of the carrier 8 and the copper disk 9 attached to it can be deflected to generate shock waves without being subjected to harmful deformations or stresses are. This leads to an increase in the life of the membrane 3. In addition, the shock waves generated are easier to focus.
  • annular section 15 At the edge 14 of the carrier 8 there is an annular section 15, by means of which the membrane 3 is held between the housing 1 and the cap 6.
  • the annular section 15 also consists of a rubber with a hardness of approximately 90 Shore, in order to be able to withstand the forces exerted by the screws 7 without any significant deformation.
  • the central region 13, the edge 14 and the annular section 15 of the carrier 8, the different hardnesses of which are indicated by corresponding hatching in FIG. 1, can be produced separately from one another and connected to one another by vulcanization.
  • the carrier 8 in a mold, the mold cavity of which can be subdivided by slides, as an integral component in the injection molding process.
  • the materials of different hardness are then essentially simultaneously heated in the viscous Condition introduced into the respective sections of the mold cavity and the slider withdrawn before the materials harden.
  • the copper disk 9 can be in the mold as an insert.
  • an insulating film 16 is provided between the copper disc 9 and the flat coil 4. Since the membrane 3 is connected to the housing 1 and the cap 6 exclusively with its electrically insulating support 8, the copper disk 9 is thus insulated both from the housing 1 and the cap 6 and from the flat coil 4 and its connections 17 and 18 . This also applies in the event that e.g. one of the connections 17 and 18 of the flat coil 4 together with the housing 1 and / or the cap 6 is at ground potential. The result of this is that the effective insulating distance between the copper disc 9 and the flat coil 4 or its connections 17 and 18 corresponds to twice the thickness of the insulating film 16. The risk of voltage flashovers between the copper disc 9 and the flat coil 4 is thus extremely low and damage caused by voltage flashovers which are disadvantageous for the life of the membrane 3 is practically excluded.
  • the membrane 3 is attached to the housing 1 in such a way that the copper disk 9 faces the flat coil 4.
  • the copper disc 9 is arranged as close as possible to the flat coil 4 with the interposition of the insulating film 16, so that there is a high degree of efficiency in converting electrical energy into impact energy.
  • the risk of voltage flashovers is avoided as a result of the measures for insulating the copper disk 9 described above.
  • the membrane 3 is in contact with the liquid in the space 2 only with its carrier 8, which is made of cavitation-insensitive rubber, so that a reduction in the life of the membrane 3 due to pitting that occurs as a result of cavitation is avoided.
  • a membrane 19 is shown, which in a shock wave generator according to the invention e.g. can be used instead of the membrane 3 described above.
  • the electrically conductive section is designed as a copper disk 20, but this has a considerably greater thickness in comparison with the copper disk 9.
  • the carrier 21, as can be seen from the hatching 2 consists of a relatively soft elastomeric material with a hardness of approximately 40 Shore and therefore sufficient rigidity of the membrane 19 only by a corresponding Dimensioning of the copper disc 20 can be achieved.
  • annular recesses 23 and 24 are provided on the edge 22 of the carrier 21, so that the edge 22 of the carrier 21 has a reduced thickness.
  • annular section 25 by means of which the membrane 19 can be held between the housing 1 and the cap 6.
  • the annular section 25 is surrounded by a sheet metal ring 26 with a U-shaped cross section for the purpose of reinforcement.
  • FIGS. 3 and 4 show an embodiment of a shock wave generator according to the invention, which differs from the one described above in that its membrane 27 has a carrier 28, which as a whole is a thin, resilient plate made of an elastomeric material with a hardness of approximately 40 Shore is formed.
  • Three electrically conductive sections 29, 30 and 31 are provided on the carrier 28, which are formed from a thin aluminum foil and fastened to the carrier 28 by gluing.
  • the electrically conductive section 29 is designed as a disk, while the electrically conductive sections 30 and 31 have the form of rings and surround the electrically conductive section 29 concentrically. If the electrically conductive sections 29 to 31 are suitably dimensioned, they are driven by the flat coil 4 in such a way that that they move away from this in a plane.
  • the shock wave generator according to FIGS. 3 and 4 thus has all the advantages mentioned above.
  • the atmosphere located between the membrane 27 and the insulating film 16 is evacuated due to the porosity of the annular body 33, so that the membrane 27 as in the right half of FIG. 3 shown applied to the insulating film 16. This ensures that the electrically conductive sections 29 to 31 of the membrane are as close as possible to the flat coil 4, so that there is a high degree of efficiency in converting electrical energy into impact energy.
  • shock wave generators are described in which the windings of the flat coil are arranged in one plane and the membrane is flat.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Surgical Instruments (AREA)
  • Disintegrating Or Milling (AREA)
EP88105999A 1987-04-27 1988-04-14 Stosswellengenerator für eine Einrichtung zum berührungslosen Zertrümmern von Konkrementen im Körper eines Lebewesens Expired - Lifetime EP0288836B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8706039U 1987-04-27
DE8706039U DE8706039U1 (de) 1987-04-27 1987-04-27 Stoßwellengenerator für eine Einrichtung zum berührungslosen Zertrümmern von Konkrementen im Körper eines Lebewesens

Publications (2)

Publication Number Publication Date
EP0288836A1 EP0288836A1 (de) 1988-11-02
EP0288836B1 true EP0288836B1 (de) 1991-08-21

Family

ID=6807420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105999A Expired - Lifetime EP0288836B1 (de) 1987-04-27 1988-04-14 Stosswellengenerator für eine Einrichtung zum berührungslosen Zertrümmern von Konkrementen im Körper eines Lebewesens

Country Status (4)

Country Link
US (1) US4905675A (es)
EP (1) EP0288836B1 (es)
JP (1) JPH0436819Y2 (es)
DE (2) DE8706039U1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19612061C1 (de) * 1996-03-27 1997-09-18 Dornier Medizintechnik Elektromagnetische Stoßwellenquelle
WO2013082352A1 (en) 2011-12-01 2013-06-06 Microbrightfield, Inc. Acoustic pressure wave/shock wave mediated processing of biological tissue, and systems, apparatuses, and methods therefor
TWI548402B (zh) * 2015-09-04 2016-09-11 寶健科技股份有限公司 震波探頭結構
US10658912B2 (en) * 2017-03-31 2020-05-19 Lite-Med Inc. Shock wave generating unit
US20180280231A1 (en) * 2017-03-31 2018-10-04 Lite-Med Inc. Invasive shock wave applicator for applying shock waves sideways

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1029846A (en) * 1974-12-20 1978-04-18 Huntec (70) Limited Underwater transient sound generator having pressure compensating fillet
DE3146626C2 (de) * 1981-11-25 1985-10-10 Dornier System Gmbh, 7990 Friedrichshafen Vorrichtung zum Zerstören von im Körper eines Lebewesens befindlichen Konkrementen
DE3312014C2 (de) * 1983-04-02 1985-11-07 Wolfgang Prof. Dr. 7140 Ludwigsburg Eisenmenger Einrichtung zur berührungsfreien Zertrümmerung von Konkrementen im Körper von Lebewesen
DE3443295A1 (de) * 1984-11-28 1986-06-05 Wolfgang Prof. Dr. 7140 Ludwigsburg Eisenmenger Einrichtung zur beruehrungsfreien zertruemmerung von konkrementen im koerper von lebewesen
DE3505894A1 (de) * 1985-02-20 1986-08-21 Siemens AG, 1000 Berlin und 8000 München Stosswellenrohr mit spule und membran
EP0256203A1 (de) * 1986-06-05 1988-02-24 Siemens Aktiengesellschaft Stosswellengenerator zum berührungslosen Zertrümmern von Konkrementen im Körper eines Lebewesens
DE8627238U1 (de) * 1986-10-06 1988-02-04 Siemens AG, 1000 Berlin und 8000 München Stoßwellenquelle

Also Published As

Publication number Publication date
JPS63172409U (es) 1988-11-09
EP0288836A1 (de) 1988-11-02
US4905675A (en) 1990-03-06
DE8706039U1 (de) 1988-08-25
JPH0436819Y2 (es) 1992-08-31
DE3864303D1 (de) 1991-09-26

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