EP0079351A1 - Installation pour emettre et recevoir des ondes ultrasonores focalisees - Google Patents

Installation pour emettre et recevoir des ondes ultrasonores focalisees

Info

Publication number
EP0079351A1
EP0079351A1 EP19820901511 EP82901511A EP0079351A1 EP 0079351 A1 EP0079351 A1 EP 0079351A1 EP 19820901511 EP19820901511 EP 19820901511 EP 82901511 A EP82901511 A EP 82901511A EP 0079351 A1 EP0079351 A1 EP 0079351A1
Authority
EP
European Patent Office
Prior art keywords
liquid
plane
oscillator
liquid lens
lens
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Withdrawn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
EP19820901511
Other languages
German (de)
English (en)
Inventor
Ernst-Günter LIERKE
Helmut Sudhof
Karl Flögel
Rudolf Grossbach
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.)
Battelle Institut eV
Original Assignee
Battelle Institut eV
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
Priority claimed from DE19813120611 external-priority patent/DE3120611A1/de
Priority claimed from DE19813142639 external-priority patent/DE3142639A1/de
Application filed by Battelle Institut eV filed Critical Battelle Institut eV
Publication of EP0079351A1 publication Critical patent/EP0079351A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
    • 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
    • G10K11/30—Sound-focusing or directing, e.g. scanning using refraction, e.g. acoustic lenses

Definitions

  • the invention relates to a device for emitting and receiving focused ultrasonic waves, in particular for local heating of biological tissues, e.g. Tumors with a piezoelectric ultrasonic transducer system and a lens.
  • Ultrasonic waves can be focused just like any other type of wave. At operating frequencies between 0.5 and 5 MHz, the corresponding wavelengths are e.g. in liquids (water) between 3 and 0.3 mm and
  • the present invention is therefore based on the object of developing a focusing ultrasound transducer system with which the area to be examined or treated can be scanned in a targeted manner without great technical effort.
  • a focusing ultrasound transducer system with which the area to be examined or treated can be scanned in a targeted manner without great technical effort.
  • Such a device should be usable in all relevant areas of medicine and biology as well as material testing and should be constructed as possible so that the transducer system is interchangeable.
  • the ultrasonic transducer system has a disk-shaped plane oscillator, in front of which a liquid chamber with a first liquid is arranged, in which one is filled with a second liquid Liquid lens is located, the focal length of the liquid lens being variable by changing the volume of the second liquid and / or the focal point in the focal plane is mechanically displaceable.
  • the device according to the invention can be used both in medical diagnosis, for example for locating tumors, kidney stones or the like, and in therapy, for example. be used for local hyperthermia treatment.
  • the main advantage in these areas compared to the previously known devices of this type is that the focusing converter can be easily adapted to commercially available therapy or diagnostic devices or material testing devices. As a result, a relatively large volume area can be scanned automatically with considerable gain for the useful level-noise level ratio, or any volume area can be treated as gently and specifically as possible.
  • FIG. 1 shows an embodiment of the device according to the invention, in which the focal point in the focal plane 25 can be shifted linearly or azimuthally and the focal length can be varied;
  • FIG. 2 shows a top view of the mounting of the ultrasound transducer system in order to achieve a linear or azimuthal displacement of the focal point in the focal plane;
  • FIG. 3 shows the formation of a plano-convex liquid lens *, - k -
  • FIG. 4 shift of the focal point in the focal plane by rotation
  • FIG. 5 shows a transducer composed of diagnostic and therapeutic parts and proposed according to the invention
  • FIG. 6 shows the effective range of the sound during therapy operation with an axial sound-free zone
  • the device according to the invention essentially consists of a liquid chamber 1, which contains a liquid lens 2 and a, comprising the ultrasonic transducer system 3, with the liquid chamber 1 e.g. outer housing 5 detachably connected by a threaded closure 4
  • the liquid lens 2 is formed from two, more or less spherically curved, elastic and hydraulically deformable membranes 6, between which a liquid, e.g. Frigen, glycerin or the like at the speed of sound c. is included.
  • the liquid in the liquid chamber 1 has a different speed of sound c ⁇ and is preferably water.
  • the liquid volume of the lens 2 can be varied via a line 7, a cylinder 8 with a piston, which is operated by a gearwheel with a transmission 9 and a motor 10.
  • membranes 6 are more or less curved. From the radius of curvature r. , r_ of the two membranes 6 and from the sound velocities c,, c_ the focal length f of the liquid lens 2 thus formed can be calculated, according to the formula
  • the rear half of the liquid chamber 1 does not need to be closed off by a membrane or film if the ultrasound transducer 3 is permanently installed and directly coupled.
  • the film 12 to which the transducer must in turn be acoustically coupled by means of a suitable coupling medium ensures unimpeded passage of energy.
  • a flexible bearing 15 is provided towards the liquid chamber 1 so that the planar oscillator 3 lies taut on the film 12 even when its angle of inclination with respect to the optical axis of the liquid lens 2 changes.
  • the storage 15 is e.g. made of a metal bellows and forms part of the lateral wall of the liquid chamber 1.
  • the faceplate 3 is placed in a housing 16 on its n ⁇ 2-thick base plate 17, e.g. made of metal, fastened.
  • the housing of the planar transducer 3 in such a housing 16 facilitates the interchangeability of the ultrasonic transducer system. This is expedient for a versatile applicability of the device according to the invention.
  • damped pulses can be obtained to achieve short pulses and e.g. undamped circular disk-shaped piezoelectrically arranged face-plates are used in therapy.
  • the outer housing 5 is either uncoupled from the liquid chamber 1 or provided with a window 18 through which manipulation is made possible. So that the contact with the film 12 is not lost when the angle of inclination of the planar transducer 3 or the base plate 17 changes, the housing 16 or the planar transducer is on the side opposite the liquid chamber 1 via a spring-loaded, central, in the direction of the surface normal rod 19 ge ge. This rod 19 moves. in the hollow cylinder 2o in the axial direction and the suspension 21 ensures in the zu ⁇
  • the rod 19 is on a disc 22 arranged perpendicular to the optical axis of the liquid lens 2 in a radial groove 23
  • modification enables the angle of inclination of the plane transducer with respect to the optical axis of the liquid lens 2, and thus a linear Ver ⁇ shift of the focal point in the focal plane.
  • the adjustment of the actuator 24 can be done manually as well as m x. motorized.
  • the disk 22 is designed as a turntable, which is driven by a motor 27 with a gear ratio 28 in Rotation can be offset.
  • a circular movement of the support point on the turntable, while at the same time changing the support point 24, is achieved.
  • only a linear or only a circular displacement can also be brought about.
  • the liquid lens with the second liquid 29 can also be formed by the plane oscillator 3 on the one hand and a film 3o on the other hand, as shown in FIG. 3.
  • a liquid chamber is only between the lens system and the area to be treated. However, this is also unnecessary if the therapy is carried out in a water bath.
  • FIG. 1 A further, simpler focus shift is shown schematically in FIG.
  • the unit containing the plane vibrator 3 and the liquid lens 2 is arranged eccentrically to the axis of rotation.
  • the rotation can be brought about by a motor.
  • the focal length can be done manually or periodically by means of a pump by changing the lens volume.
  • the plane oscillator consists of two parts, namely an outer ring 31, which is undamped and is used for line radiation, and a central part 32, which is damped with a damping substance 33, for pulse echo - Business. Both parts are fastened concentrically on the base plate 34 of the housing (not shown here).
  • n can be the same or different.
  • the proposed combination enables diagnosis and treatment to be carried out simultaneously.
  • the temperature rise in the focal point of the therapy head is registered with a thermocouple and must be kept constant within predetermined temperature limits.
  • the diagnostic insert 32 the focal point can be adjusted precisely to the target area, ie the thermocouple located in the center of the target area, before the therap is carried out via the same, now adjustable lens system.
  • FIG. 6 shows that tissue overheating in the region of the focal point of the lens 35 is made possible when the transducer part 31, which is only intended for therapy, is used. At the same time, the sound-free leading section 36 is protected.
  • the target area can be diagnostically explored and monitored immediately before and during therapy without the treatment head having to be replaced. If only the converter head with a lens system is adapted, simultaneous diagnosis and therapy can be carried out with commercially available generators or diagnostic devices.
  • the low-performance use of diagnostics in the center of the therapy head reduces the transmission power only slightly in proportion to the area with the same intensity, but has a favorable influence on the axial temperature profile in the distance between the lens and the focal point.
  • the transducer construction according to the invention enables tissue overheating in the area of the acoustic focal point of the lens while protecting the leading section at the same time.
  • the inventive device for hyperthermia in combination with radiation therapy of tumors can be gleich ⁇ sets.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Surgical Instruments (AREA)

Abstract

Dans l'installation pour emission et reception d'ondes ultrasonores focalisees un oscillateur plan (3) en forme de disque est couple a une chambre a liquide (1). Dans la chambre a liquide (1) se trouve une lentille liquide (2) qui contient un second liquide. La distance focale de la lentille liquide (2) peut etre modifiee en agissant sur le volume de liquide qu'elle contient. En outre, le foyer est deplacable dans le plan focal par exemple en reglant l'angle de l'oscillateur plan (3) par rapport a l'axe optique de la lentille liquide (2) ou par rotation excentree de la lentille liquide (2) avec l'oscillateur plan (3).
EP19820901511 1981-05-23 1982-05-19 Installation pour emettre et recevoir des ondes ultrasonores focalisees Withdrawn EP0079351A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19813120611 DE3120611A1 (de) 1981-05-23 1981-05-23 "vorrichtung zur abstrahlung und zum empfang fokussierter ultraschallwellen"
DE3120611 1981-05-23
DE3142639 1981-10-28
DE19813142639 DE3142639A1 (de) 1981-10-28 1981-10-28 "vorrichtung zur abstrahlung und zum empfang fokussierter ultraschallwellen

Publications (1)

Publication Number Publication Date
EP0079351A1 true EP0079351A1 (fr) 1983-05-25

Family

ID=25793477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820901511 Withdrawn EP0079351A1 (fr) 1981-05-23 1982-05-19 Installation pour emettre et recevoir des ondes ultrasonores focalisees

Country Status (2)

Country Link
EP (1) EP0079351A1 (fr)
WO (1) WO1982004157A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0131653A1 (fr) * 1983-07-19 1985-01-23 N.V. Optische Industrie "De Oude Delft" Dispositif pour la destruction à distance des objets pierreux présents dans le corps par ondes de choc soniques
EP0131654A1 (fr) * 1983-07-19 1985-01-23 N.V. Optische Industrie "De Oude Delft" Dispositif pour la destruction à distance des objets pierreux présents dans le corps par ondes de choc soniques
FR2562747B1 (fr) * 1984-04-04 1987-09-11 Edap Sonde d'echograhie a disque piezoelectrique oscillant solidaire d'une membrane deformable formant lentille de focalisation
EP0275460A1 (fr) * 1986-12-22 1988-07-27 Siemens Aktiengesellschaft Tête émettrice d'ondes de choc pour la fragmentation à distance de concrétions
DE3739393C2 (de) * 1987-11-20 1996-07-18 Siemens Ag Lithotripter mit verstellbarer Fokussierung
EP1171780A1 (fr) * 1999-04-20 2002-01-16 Synthes Ag Chur Dispositif permettant d'obtenir par voie percutanee des coordonnees tridimensionnelles a la surface d'un organe d'humain ou d'animal
CN114067778B (zh) * 2021-10-20 2024-08-16 西安交通大学 一种高折射率平板声聚焦透镜及聚能装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2313267A1 (de) * 1973-03-06 1974-09-26 Holotron Corp Verfahren und vorrichtung zur umwandlung von strahlung durch rotierende abtastung
US3927557A (en) * 1974-05-30 1975-12-23 Gen Electric Acoustic imaging apparatus with liquid-filled acoustic corrector lens
US3968459A (en) * 1975-01-29 1976-07-06 Sperry Rand Corporation Ultrasonic driver transducer
JPS52130178A (en) * 1976-04-23 1977-11-01 Tokyo Shibaura Electric Co Ultrasonic high speed repetition scanning device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8204157A1 *

Also Published As

Publication number Publication date
WO1982004157A1 (fr) 1982-11-25

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19830801

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SUDHOF, HELMUT

Inventor name: GROSSBACH, RUDOLF

Inventor name: FLOEGEL, KARL

Inventor name: LIERKE, ERNST-GUENTER