EP0108190B1 - Stosswellenreflektor - Google Patents

Stosswellenreflektor Download PDF

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Publication number
EP0108190B1
EP0108190B1 EP83106090A EP83106090A EP0108190B1 EP 0108190 B1 EP0108190 B1 EP 0108190B1 EP 83106090 A EP83106090 A EP 83106090A EP 83106090 A EP83106090 A EP 83106090A EP 0108190 B1 EP0108190 B1 EP 0108190B1
Authority
EP
European Patent Office
Prior art keywords
reflector
angle
wave
die
max
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
Application number
EP83106090A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0108190A3 (en
EP0108190A2 (de
Inventor
Othmar Dr.Rer.Nat. Wess
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 System GmbH
Original Assignee
Dornier System 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 System GmbH filed Critical Dornier System GmbH
Publication of EP0108190A2 publication Critical patent/EP0108190A2/de
Publication of EP0108190A3 publication Critical patent/EP0108190A3/de
Application granted granted Critical
Publication of EP0108190B1 publication Critical patent/EP0108190B1/de
Expired 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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/28—Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors

Definitions

  • the invention relates to a reflector for focusing shock waves for the contact-free comminution of concrements in bodies of living beings according to DE-A-23 51247.
  • the reflector has the shape of an ellipsoid and has the task of absorbing shock waves that are generated at a spark gap in the first focal point and spread through a liquid in the reflector to the second focal point, in which the concrement to be destroyed e.g. a kidney stone is in focus.
  • the reflector should transmit as high a proportion of the wave energy generated in the first focal point as possible in phase to the second focal point.
  • Reflectors made of brass are known with an enclosure angle of approximately 250 °, whereby the full solid angle (4n) is used to approximately 90% and an axis ratio a: b of approximately 2: 1 (E. Schmiedt: Contributions to Urology, Vol. 2 , Pages 8-13, Kunststoff 1980).
  • the other constraints such as stability and easy workability have led to the use of brass.
  • the invention has for its object to provide a reflector that focuses shock waves with a higher efficiency than the reflectors known from the prior art.
  • the invention is based on the knowledge that it is not the jump in sound wave resistance ⁇ ⁇ c that alone is the decisive variable for good focusing, but that the speeds of the sound wave in the reflector material and in the liquid must be coordinated with one another.
  • the waves hitting the surface of the reflector stimulate it, among other things. to transversal vibrations that propagate with characteristic propagation velocities in the reflector material and on its surface.
  • the reflected wavefront is disturbed if, due to time differences, the reflection surface already swings in the direction of the surface normal when the primary wavefront arrives.
  • In-phase focusing in the second focal point is achieved when the wave propagates faster in the liquid than in the reflector.
  • the wavefront then always hits a stationary reflector surface.
  • materials can also be used whose transverse surface speed is greater than the speed of sound in the coupling medium, e.g. Water is when only the leading of the surface wave is prevented by the geometry of the reflector by complying with the condition mentioned in claim 1.
  • the reflected useful wave itself remains undisturbed and retains the original steepness of the primary wave. All other faults - e.g. are generated by the lagging surface wave - follow the useful wave with a time delay and cannot impair the focusing process.
  • Reflectors according to the invention realize a much better focusing than before, since all wave components overlap in phase.
  • the slope of the pressure rise which is essential for comminution, remains high.
  • the shredding performance increases, fewer applications than before are necessary, which relieves the patient and increases the service life of the spark gap.
  • the condition c To ⁇ c s is met if lead is used as the reflector material and water is used as the coupling liquid. Since the transverse speed of sound in lead at 710 m / sec is lower than the speed of sound in water at 1480 m / sec, the propagating primary wave 7 is always faster than the surface wave 10. The condition is therefore always fulfilled regardless of the reflector geometry. A critical angle ⁇ k does not occur. It is not necessary for the entire reflector body to be made of lead. It is sufficient if the inner surface of the reflector consists of a layer of lead.
  • the condition according to the invention can also be met by reflectors made of a material whose c To > c s .
  • the focus can be improved for the same material by choosing the axial ratio of the ellipsoid closer to 1 or by dispensing with edge zones (smaller angle of coverage).
  • the edge zones are extremely important for the transmission and should not be left out.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Surgical Instruments (AREA)
EP83106090A 1982-11-06 1983-06-22 Stosswellenreflektor Expired EP0108190B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3241026 1982-11-06
DE3241026A DE3241026C2 (de) 1982-11-06 1982-11-06 Reflektor zur Fokussierung von Stoßwellen

Publications (3)

Publication Number Publication Date
EP0108190A2 EP0108190A2 (de) 1984-05-16
EP0108190A3 EP0108190A3 (en) 1984-07-25
EP0108190B1 true EP0108190B1 (de) 1986-09-24

Family

ID=6177450

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106090A Expired EP0108190B1 (de) 1982-11-06 1983-06-22 Stosswellenreflektor

Country Status (4)

Country Link
US (1) US4570634A (enrdf_load_stackoverflow)
EP (1) EP0108190B1 (enrdf_load_stackoverflow)
JP (1) JPS5988146A (enrdf_load_stackoverflow)
DE (2) DE3241026C2 (enrdf_load_stackoverflow)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5150712A (en) * 1983-12-14 1992-09-29 Edap International, S.A. Apparatus for examining and localizing tumors using ultra sounds, comprising a device for localized hyperthermia treatment
USRE33590E (en) 1983-12-14 1991-05-21 Edap International, S.A. Method for examining, localizing and treating with ultrasound
US5143073A (en) * 1983-12-14 1992-09-01 Edap International, S.A. Wave apparatus system
NL8400504A (nl) * 1984-02-16 1985-09-16 Optische Ind De Oude Delft Nv Inrichting voor het aanrakingsloos vergruizen van zich in een lichaam bevindende concrementen.
DE3617032C2 (de) * 1985-05-24 1997-06-05 Elscint Ltd Lithotripsiegerät mit extrakorporalem Stoßwellengenerator
DE3544344A1 (de) * 1985-12-14 1987-06-19 Dornier Medizintechnik Vorrichtung zur thromboisierung mittels stosswellen
FR2600520B1 (fr) * 1986-06-30 1990-09-21 Technomed Int Sa Appareil de generation d'ondes de choc de frequence elevee dans un liquide pour la destruction a distance de cibles, telles que des concretions dont la connectique d'alimentation en courant electrique est disposee a l'interieur d'un element tubulaire limitant ou empechant les fuites electromagnetiques
CS261485B1 (en) * 1986-10-29 1989-02-10 Jiri Mudr Rndr Benes Device for clinic out-of-body lithotripsy of gall stones
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
DE3835318C1 (enrdf_load_stackoverflow) * 1988-10-17 1990-06-28 Storz Medical Ag, Kreuzlingen, Ch
DE3900433A1 (de) * 1989-01-10 1990-07-12 Schubert Werner Verfahren und vorrichtung fuer die behandlung von erkrankungen mit ultraschallwellen
SE465552B (sv) * 1989-03-21 1991-09-30 Hans Wiksell Anordning foer soenderdelning av konkrement i kroppen paa en patient
US4945898A (en) * 1989-07-12 1990-08-07 Diasonics, Inc. Power supply
US5065761A (en) * 1989-07-12 1991-11-19 Diasonics, Inc. Lithotripsy system
US6755796B2 (en) 1999-02-07 2004-06-29 Medispec Ltd. Pressure-pulse therapy apparatus
IL128404A0 (en) * 1999-02-07 2000-01-31 Spector Avner Device for transmission of shock waves on to large surfaces of human tissue

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1264681B (de) * 1961-07-05 1968-03-28 Siemens Ag Fuer die medizinische Ultraschalldiagnose nach dem Impuls-Echoverfahren bestimmtes ultraschall-spiegeloptisches System zum Senden und Empfangen von Ultraschallwellen
US3302163A (en) * 1965-08-31 1967-01-31 Jr Daniel E Andrews Broad band acoustic transducer
CH574734A5 (enrdf_load_stackoverflow) * 1973-10-12 1976-04-30 Dornier System Gmbh
DE2508494A1 (de) * 1975-02-27 1976-09-02 Hansrichard Dipl Phys D Schulz Anordnung zum fokussieren von elektromagnetischen oder mechanischen wellen
DE2538960C2 (de) * 1975-09-02 1985-04-11 Dornier System Gmbh, 7990 Friedrichshafen Vorrichtung zum berührungslosen Zertrümmern von in einem Lebewesen befindlichen Konkrementen
US4311147A (en) * 1979-05-26 1982-01-19 Richard Wolf Gmbh Apparatus for contact-free disintegration of kidney stones or other calculi

Also Published As

Publication number Publication date
DE3366440D1 (en) 1986-10-30
JPH0417660B2 (enrdf_load_stackoverflow) 1992-03-26
EP0108190A3 (en) 1984-07-25
EP0108190A2 (de) 1984-05-16
JPS5988146A (ja) 1984-05-22
DE3241026C2 (de) 1986-12-04
DE3241026A1 (de) 1984-05-10
US4570634A (en) 1986-02-18

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