EP0436809A2 - Sonde ultrasonore comportant des éléments piézoélectriques - Google Patents

Sonde ultrasonore comportant des éléments piézoélectriques Download PDF

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Publication number
EP0436809A2
EP0436809A2 EP90122050A EP90122050A EP0436809A2 EP 0436809 A2 EP0436809 A2 EP 0436809A2 EP 90122050 A EP90122050 A EP 90122050A EP 90122050 A EP90122050 A EP 90122050A EP 0436809 A2 EP0436809 A2 EP 0436809A2
Authority
EP
European Patent Office
Prior art keywords
electrodes
transducer elements
transducer
ultrasonic transducer
figures
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Withdrawn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
EP90122050A
Other languages
German (de)
English (en)
Other versions
EP0436809A3 (en
Inventor
Dagobert Dipl.-Ing. Schäfer
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.)
Richard Wolf GmbH
Original Assignee
Richard Wolf 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 Richard Wolf GmbH filed Critical Richard Wolf GmbH
Publication of EP0436809A2 publication Critical patent/EP0436809A2/fr
Publication of EP0436809A3 publication Critical patent/EP0436809A3/de
Withdrawn legal-status Critical Current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
    • 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
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
    • B06B1/0637—Spherical array

Definitions

  • the invention relates to an ultrasound transducer for lithotripsy, in which piezoelectric transducer elements are fastened to a carrier and are connected on the front side to first electrodes and on the rear side to second electrodes which can be connected to an electrical pulse generator in order to generate electrical fields in pulses in the transducer elements via the electrodes and make them vibrate.
  • Ultrasonic transducers designed in this way are known. Their mode of operation is based on the fact that when a voltage is applied, the piezoceramic transducer element in the interior is suddenly produced a mechanical stress state which arises from the fact that an electrical field builds up in the interior of the transducer element, which causes every layer of the transducer element endeavors to change its thickness. If the electrodes of the ceramic bodies of the transducer elements are parallel, a homogeneous electric field is generated inside them, which generates transducer elements with negative signs in addition to positive pressure pulses when the transducer elements are attached to a reflection-free backing (backing). These appear as pulling impulses, which in particular with the usual focusing transducers entail the risk of tissue damage in the focus environment.
  • DE-PS 34 25 992 shows a piezoelectric transducer in which a plurality of transducer elements are arranged on the front of a spherical cap-shaped carrier.
  • the dome material is selected so that its wave resistance hardly differs from that of the ceramic elements and the back of the surface of the dome is designed in such a way that the sound waves reflected on it, generated by the ceramic elements, are not focused. This allows a favorable ratio of the amplitudes of the achieve positive and negative pulses, but a desired further reduction of the negative pulses cannot be achieved, since their shape at the transducer element carrier interface is predetermined by the existing geometry of the transducer elements and the electrode arrangement.
  • DE-OS 31 19 295 shows a further device for destroying concrements, in which the risk of tissue damage is reduced by the fact that the ultrasound transducer to be focused on the concretion is so large that on the one hand, the sound power density on the transmission path is small, but on the other hand the focus is so large that it is sufficient to destroy the concretion in focus.
  • the electrodes are designed and arranged in such a way that a homogeneous field can be generated in the region of one end of the transducer elements and an inhomogeneous field in the opposite region of the transducer elements.
  • the second electrodes have an at least partially different shape from the first electrodes and specifically in that the second, cup-shaped electrodes each completely enclose one area of the transducer elements.
  • This measure increases the amplitude of the positive pressure pulse, while at the same time reducing that of the negative pressure pulse and increasing its duration.
  • the result is opposite behavior when the positive and negative pressure pulses are generated, the duration multiplied by the square of the amplitude being a measure of the energy density contained in the respective pressure pulse.
  • the bottom of the cup-shaped second electrodes can run parallel to the first electrodes.
  • the second electrodes can also be designed in the form of rings which lie on the same axis as the transducer elements assigned to them and each surround the rear part of the transducer elements.
  • the electrical connection can be made on the rear side in that the rear end surfaces of the transducer elements and the rings are connected in an electrically conductive manner to the likewise conductive carrier.
  • Another possibility of the rear electrical connection is that the second electrodes are formed by recesses in the electrically conductive carrier and that the electrodes with their rear parts are fixed in the recesses.
  • the electrical connection of the transducer elements at the front can take place in that the front ends of the transducer elements are covered together with an electrical conductor forming the first electrodes.
  • FIG. 1 shows a focusing ultrasound transducer 1 which has a multiplicity of piezoelectric ultrasound transducer elements 2 in a ring arrangement around the central axis.
  • the ultrasound transducer 1 is designed in the shape of a spherical cap and is therefore mechanically focused and, moreover, can be electronically focused in a known and therefore not to be described in detail.
  • the transducer elements 2 are fastened according to FIG. 2 with their rear ends to an electrically conductive carrier 3, which has a dome-shaped basic shape, preferably by gluing.
  • Each converter element 2 as can be seen better in FIG. 3, is bordered at its rear end by a cup-shaped electrode 4, so that it forms the contact with the electrically conductive carrier 3. This contact is ensured by using an electrically conductive adhesive.
  • the cup-shaped design of the electrode 4 has the effect that not only the flat end face of the transducer elements 2 is electrically conductively connected, but also parts of the lateral boundary surfaces thereof. This fact has the effect that when a voltage is applied between a front electrode 5 and the rear cup-shaped electrodes 4, an electrical field as indicated in FIG.
  • the front electrode 5 can be provided in the form of an electrically conductive film to which the front faces of the transducer elements 2 are connected.
  • the structure of the ultrasound transducer 1 according to FIG. 4 provides that the transducer elements 2 are attached with their front faces to a plate 6 that conducts sound energy and is electrically conductive, and the cup-shaped electrodes 4 attached to the back of the transducer elements 2 are individually electrically conductively connected to one another .
  • the transducer elements 2 designed according to the invention are fastened with their rear ends, bordered by cup-shaped electrodes 4, to a flat support surface and, according to FIG. 6, are fitted into a recess 7 in the support 3, thus giving the cup-shaped configuration of the electrode 4. 7, a conical recess 8 is provided, which likewise causes an inhomogeneity of the electrical field in the region of the rear end of the transducer element 2.
  • the pulse-wise electrical impingement of the transducer elements 2 takes place in a known manner by means of a pulse generator 9, the poles of which are connected on the one hand to the carrier 3 and on the other hand to the film connecting the front ends of the transducer elements 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Surgical Instruments (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
EP19900122050 1990-01-09 1990-11-17 Ultrasonic transducer using piezoelectric elements Withdrawn EP0436809A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4000362 1990-01-09
DE4000362A DE4000362C2 (de) 1990-01-09 1990-01-09 Ultraschallwandler mit piezoelektrischen Wandlerelementen

Publications (2)

Publication Number Publication Date
EP0436809A2 true EP0436809A2 (fr) 1991-07-17
EP0436809A3 EP0436809A3 (en) 1992-07-22

Family

ID=6397744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900122050 Withdrawn EP0436809A3 (en) 1990-01-09 1990-11-17 Ultrasonic transducer using piezoelectric elements

Country Status (3)

Country Link
US (1) US5101133A (fr)
EP (1) EP0436809A3 (fr)
DE (1) DE4000362C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997016260A1 (fr) * 1995-11-02 1997-05-09 Sonident Anstalt Transducteur ultrasonore piezo-electrique
EP1452141A1 (fr) 2003-02-26 2004-09-01 HMT High Medical Technologies AG Dispositif de génération d'ondes de choc

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329202A (en) * 1991-11-22 1994-07-12 Advanced Imaging Systems Large area ultrasonic transducer
DE4307669C2 (de) * 1993-03-11 1995-06-29 Wolf Gmbh Richard Gerät zur Erzeugung von Schallimpulsen für den medizinischen Anwendungsbereich
US5743855A (en) * 1995-03-03 1998-04-28 Acuson Corporation Broadband phased array transducer design with frequency controlled two dimension capability and methods for manufacture thereof
US5438998A (en) * 1993-09-07 1995-08-08 Acuson Corporation Broadband phased array transducer design with frequency controlled two dimension capability and methods for manufacture thereof
US5415175A (en) * 1993-09-07 1995-05-16 Acuson Corporation Broadband phased array transducer design with frequency controlled two dimension capability and methods for manufacture thereof
US5595178A (en) * 1994-10-02 1997-01-21 Hmt High Medical Technologies Gmbh System, method and apparatus for treatment of degenerative bone
DE19733233C1 (de) * 1997-08-01 1998-09-17 Wolf Gmbh Richard Elektroakustischer Wandler
EP1779784B1 (fr) * 2004-06-07 2015-10-14 Olympus Corporation Transducteur ultrasonique à capacité électrostatique
EP1832314B8 (fr) * 2004-12-27 2023-07-19 Chengdu Heuk Medical Equipment Co., Ltd Transducteur a ultrasons d'intensite elevee et de grande puissance a mise au point quasi automatique
JP4703382B2 (ja) * 2005-02-14 2011-06-15 富士フイルム株式会社 振動子アレイの構造、およびその作製方法、並びに超音波プローブ
WO2016054448A1 (fr) * 2014-10-02 2016-04-07 Chirp Microsystems Transducteurs à ultrasons micro-usinés piézoélectriques ayant des circuits d'émission et de réception différentiels
CN105234063A (zh) * 2015-11-06 2016-01-13 中国科学院深圳先进技术研究院 基于径向模式的单阵元超声低频换能器
DE102021128282B4 (de) 2021-10-29 2023-08-24 Pi Ceramic Gmbh Halterungsvorrichtung

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183007A (en) * 1978-02-22 1980-01-08 Fischer & Porter Company Ultrasonic transceiver
US4217684A (en) * 1979-04-16 1980-08-19 General Electric Company Fabrication of front surface matched ultrasonic transducer array
DE3119295A1 (de) * 1981-05-14 1982-12-16 Siemens AG, 1000 Berlin und 8000 München Einrichtung zum zerstoeren von konkrementen in koerperhoehlen
US4460841A (en) * 1982-02-16 1984-07-17 General Electric Company Ultrasonic transducer shading
US4551647A (en) * 1983-03-08 1985-11-05 General Electric Company Temperature compensated piezoelectric transducer and lens assembly and method of making the assembly
US4608507A (en) * 1984-06-29 1986-08-26 Micro Pure Systems, Inc. Damping device for focused piezoelectric transducer
DE3425992C2 (de) * 1984-07-14 1986-10-09 Richard Wolf Gmbh, 7134 Knittlingen Piezoelektrischer Wandler zur Zerstörung von Konkrementen im Körperinneren
JPH0660896B2 (ja) * 1984-11-02 1994-08-10 株式会社日立製作所 超音波探触子
US4604543A (en) * 1984-11-29 1986-08-05 Hitachi, Ltd. Multi-element ultrasonic transducer
DE3545353A1 (de) * 1985-12-20 1987-06-25 Siemens Ag Verfahren und vorrichtung zur messung der schalleistung eines fokussierten ultraschallfeldes
JPS6382100A (ja) * 1986-09-26 1988-04-12 Hitachi Ltd 圧電素子およびその製造方法
EP0267475B1 (fr) * 1986-11-04 1990-02-21 Siemens Aktiengesellschaft Capteur d'ultrasons
DE3803275A1 (de) * 1988-02-04 1989-08-17 Dornier Medizintechnik Piezoelektrische stosswellenquelle
DE3932959C1 (fr) * 1989-10-03 1991-04-11 Richard Wolf Gmbh, 7134 Knittlingen, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997016260A1 (fr) * 1995-11-02 1997-05-09 Sonident Anstalt Transducteur ultrasonore piezo-electrique
EP1452141A1 (fr) 2003-02-26 2004-09-01 HMT High Medical Technologies AG Dispositif de génération d'ondes de choc

Also Published As

Publication number Publication date
EP0436809A3 (en) 1992-07-22
DE4000362C2 (de) 1993-11-11
DE4000362A1 (de) 1991-07-11
US5101133A (en) 1992-03-31

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