US2728869A - Piezoelectric oscillator or vibrator for ultrasonic waves, especially as an instrument for therapeutical treatment and diagnosis - Google Patents

Piezoelectric oscillator or vibrator for ultrasonic waves, especially as an instrument for therapeutical treatment and diagnosis Download PDF

Info

Publication number
US2728869A
US2728869A US137092A US13709250A US2728869A US 2728869 A US2728869 A US 2728869A US 137092 A US137092 A US 137092A US 13709250 A US13709250 A US 13709250A US 2728869 A US2728869 A US 2728869A
Authority
US
United States
Prior art keywords
vibrator
ultrasonic waves
resonators
diagnosis
instrument
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
US137092A
Inventor
Pohlman Reimar
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.)
Ultraschall A G
ULTRASCHALL AG
Original Assignee
Ultraschall A G
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 Ultraschall A G filed Critical Ultraschall A G
Priority to US137092A priority Critical patent/US2728869A/en
Application granted granted Critical
Publication of US2728869A publication Critical patent/US2728869A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607Methods 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
    • B06B1/0622Methods 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

Definitions

  • This invention relates to a piezoelectric oscillator or vibrator for ultrasonic waves that is utilizable in particular as an instrumentfor purposes of therapeutic treatment (so-called massage-head).
  • An object of the present invention is the provision of an instrument which is distinguished by a compact design that enables a particularly high intensity of output to be radiated, and not only ensures, even when high voltages are used, perfect electrical protection of the body of the patient under treatment and painless transmission of the ultrasonic vibrations to said patient, but also conducts away and otherwise diminishes, in an eflicient manner, the heat generated in the oscillatory system.
  • said metal plate is firmly joined mechanically to the vibrator proper, for instance a piezoelectric resonator, by cementing with a solvent-free cement.
  • a solvent-free cement is particularly advantageous for use as the cement for this purpose.
  • the cement for this purpose is a polymerization cement whose state of aggregation at operating temperatures is that of a solid.
  • the polymerization cement it is also possible to use a thin film of oil or a thin film of a suitable grease or Canada balsam or the like, by means of which the piezoelectric resonator is mechanically joined to the metal plate in the known manner, but this joint is sufliciently firm only if the two elements to be joined together are each individually tuned to the same natural frequency.
  • Figures 1 to 7 are diagrams each of which illustrates a separate embodiment of the inventive idea.
  • the quartz and the metal plate In order to enable the quartz to operate against a layer of low characteristic impedance, thereby securing improved adaptation of the oscillator to the highfrequency generator, it may be found expedient to dispose between the quartz and the metal plate an appropriately tuned layer of a medium of low characteristic impedance and high tensile strength such as unvulcanized rubber, etc.
  • the characteristic impedance of the cemented-on plate may also be reduced by providing said plate at the cemented joint with recesses 10 so adapted in depth and cross-section that on the one hand good transmission of sound from the quartz 2d to the plate 1d is achieved (Fig. and on the other 2,728,869 Patented Dec. 27, 1955 the Fresnel lens, an influencing of the radiation field in the desired manner is achieved.
  • a metal mass 3 or some other In order to prevent a portion of the ultrasonic output being radiated otf in the rearward direction, i. e., by the back electrode located on the rear side of the piezoelectric resonator, a metal mass 3 or some other,
  • a back electrode for instance ceramic, superficially metallized mass (as shown in Figs. 1 and 5) out of tune with the oscillating system is used as the back electrode in accordance with a further embodiment of the invention, which mass, whilst standing in excellent electrical contact with the oscillating system, is at the same time arranged in such slight mechanical contact therewith that no or practically no energy is withdrawn from the oscillating system thereby.
  • a back electrode is a metal plate which, on its surface facing the piezoelectric resonator, is either well roughened or sand blasted or provided with mechanically-produced grooves or the like.
  • the back electrode may consist of a flexible metallic mass 4, e. g. a copper-wire net, pressed against the vibrator by an elastic cushion or pad 5.
  • a further protection against such undesirable sparkovers is achieved, as shown in Fig. 4, by providing a length of cylindrical or tapering metal tube 6 coaxial with the piezoelectric resonator, said tube surrounding the piezoelectric resonator and the back electrode whilst being suitably spaced therefrom.
  • the end achieved by the provision of this length of tube is that, in a manner In this position, however, the are no longer constitutes a danger to the quartz and does not in any way jeopardize the useful life of the object of the invention.
  • the oscillatory system operates at maximum efficiency when not only any radiation of its ultrasonic output in a rearward direction, i. e., by the back electrode, is prevented as far as possible, but, in addition, if also the diameter of the vibrator plate is tuned to the corresponding natural radial frequency. In addition it is desirable to choke as far as possible any radial deflection of the generated vibrations in the direction of the handle. According to a further embodiment of the invention, this aim is achieved by providing in the metal plate located on the radiating side of the piezoelectric resonator one or a plurality of annular grooves 4c whose diameter and depth are selected in accordance with the purpose stated.
  • a filling mass arranged in this way is particularly effective if its melting-point or point of transformation is in the vicinity of the maximum desired operating temperature and if it at the same time possesses as high as possible a heat of fusion or of transformation.
  • a filling mass whose melting or transformation point is as near as possible to 37 C., as this is the temperature found most agreeable when physical contact with the instrument takes place.
  • substances that can be used to constitute such a mass are phenol, lauric acid, capric acid, p-toluidin and similar organic compounds, and also low-melting metallic alloys, or such inorganic salts as sodium thiosulphate; tetracresyl silicate, for instance, and many other substances, can be used as a mass of high thermal capacity.
  • an elastically deformable vibrator surface comprising a multiplicity of flat-built oscillators, comprising metal plates 1e and resonators 2e of Fig. 6, or metal plates 1] and resonators 2f of Fig.
  • the individual vibrators are in this case independent radiators surrounded by an insulating casing 12 and jointly pressed, by an elastic medium such as a sponge-rubber pad 13, against the area of the body to be treated.
  • the whole is covered with a flexible envelope 12.
  • metal plates of predetermined curvature may be used, said curvature either coinciding with the curvature of the bodily area to be treated or providing the desired focusing of the radiators in this way arranged to radiate convergently.
  • a plurality of piezoelectric resonators a plurality of metal plates each associated with one of said resonators and firmly connected to one side thereof, means for flexibly connecting said metal plates in juxtaposition to form a flexible mosaic-like surface adapted to transmit ultrasonic waves, electricallyintegral flexible back-electrode means in electrical contact with said resonators on the side thereof remote from said metal plates, and a flexible mat of electrically-insulating material disposed on the side of said backelectrode means remote from said resonators, said combination being adapted, under pressure against said mat, to establish contact between said mosaic-like surface and a curved surface for transmitting said ultrasonic waves thereto.
  • a plurality of piezoelectric resonators a plurality of metal plates each associated with one of said resonators and firmly connected to one side thereof, means for flexibly connecting said metal plates in juxtaposition to form a flexibly mosaic-like surface adapted to transmit ultrasonic waves, electrically-integral flexible back-electrode means in electrical contact with said resonators on the side thereof remote from said metal plates, a plurality of electrically-insulating covers each associated with one of said resonators and covering the side of said back-electrode means remote from said resonators, and a flexible mat of electricallyinsulating material disposed on the side of said electrode means remote from said resonators, said combination being adapted, under pressure against said mat, to establish contact between said mosaic-like surface and a curved surface for transmitting said ultrasonic waves thereto.

Description

Dec. 27. 1995 R. POHLMAN 2,728,869
PIEZOELECTRIC OSCILLATOR OR VIBRATOR FOR ULTRASONIC WAVES, ESPECIALLY AS AN INSTRUMENT FOR THERAPEUTICAL TREATMENT AND DIAGNOSIS Filed Jan. 6, 1950 2 Sheets-Sheet 1 1 5- z 4 I I 4 C; ny
INVENTOR REIMAR F'DHLMAN Dec. 27. 1905 o MAN 2,728,869
PIEZOELEICT OSCILLATOR VIBRATOR FOR ULTRASONIC WAVE ESPECI LY AN L RUMENT FOR THERAPEUTICA REA ENT A DIAGNOSIS Filed Jan. 6, 1950 2 Sheets-Sheet 2.
V WWW INVENTOR REIMAR F'IJHLMAN AEIENT United States Patent PIEZOELECTRIC OSCILLATOR OR VIBRATOR FOR ULTRASONIC WAVES, ESPECIALLY AS AN IN- STRUMENT FOR THERAPEUTICAL TREAT- MENT AND DIAGNOSIS Reimar Pohlman, Zurich, Switzerland, assignor to USAG Ultraschall A. G., Zurich, Switzerland, a company of Switzerland Application January 6, 1950, Serial No. 137,092
3 Claims. (Cl. 3108.7)
This invention relates to a piezoelectric oscillator or vibrator for ultrasonic waves that is utilizable in particular as an instrumentfor purposes of therapeutic treatment (so-called massage-head). An object of the present invention is the provision of an instrument which is distinguished by a compact design that enables a particularly high intensity of output to be radiated, and not only ensures, even when high voltages are used, perfect electrical protection of the body of the patient under treatment and painless transmission of the ultrasonic vibrations to said patient, but also conducts away and otherwise diminishes, in an eflicient manner, the heat generated in the oscillatory system. These advantages are primarily achieved according to the invention by disposing on that side of the vibrator from which the ultrasonic waves are emitted a metal plate the thickness of which is an integral multiple of half the ultrasonic wavelength (M2) and conveniently double said half wave-length (i. e., A). The result of this arrangement is that the surface of contact between the vibrator and the metal exactly coincides with the nodal pressure point, i. e., in the loop of the ultrasonic Waves, so that said surface of contact is mechanically relieved.
In accordance with a preferred embodiment of the invention, said metal plate is firmly joined mechanically to the vibrator proper, for instance a piezoelectric resonator, by cementing with a solvent-free cement. Particularly advantageous for use as the cement for this purpose is a polymerization cement whose state of aggregation at operating temperatures is that of a solid. Instead of the polymerization cement it is also possible to use a thin film of oil or a thin film of a suitable grease or Canada balsam or the like, by means of which the piezoelectric resonator is mechanically joined to the metal plate in the known manner, but this joint is sufliciently firm only if the two elements to be joined together are each individually tuned to the same natural frequency.
The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawings, showing by way of example, preferred embodiments of the inventive idea. In the drawings:
Figures 1 to 7 are diagrams each of which illustrates a separate embodiment of the inventive idea.
In order to enable the quartz to operate against a layer of low characteristic impedance, thereby securing improved adaptation of the oscillator to the highfrequency generator, it may be found expedient to dispose between the quartz and the metal plate an appropriately tuned layer of a medium of low characteristic impedance and high tensile strength such as unvulcanized rubber, etc. The characteristic impedance of the cemented-on plate may also be reduced by providing said plate at the cemented joint with recesses 10 so adapted in depth and cross-section that on the one hand good transmission of sound from the quartz 2d to the plate 1d is achieved (Fig. and on the other 2,728,869 Patented Dec. 27, 1955 the Fresnel lens, an influencing of the radiation field in the desired manner is achieved.
In order to prevent a portion of the ultrasonic output being radiated otf in the rearward direction, i. e., by the back electrode located on the rear side of the piezoelectric resonator, a metal mass 3 or some other,
for instance ceramic, superficially metallized mass (as shown in Figs. 1 and 5) out of tune with the oscillating system is used as the back electrode in accordance with a further embodiment of the invention, which mass, whilst standing in excellent electrical contact with the oscillating system, is at the same time arranged in such slight mechanical contact therewith that no or practically no energy is withdrawn from the oscillating system thereby. Conveniently used as such a back electrode is a metal plate which, on its surface facing the piezoelectric resonator, is either well roughened or sand blasted or provided with mechanically-produced grooves or the like. In this way it is possible to ensure that the contact between the metal plate serving as the back electrode and the, conveniently, metallized surface of the piezoelectric resonator is punctual or linear only, so that the greater portion of the surface of the back electrode remains out of mechanical contact with the piezoelectric resonator without, however, satisfactory electrical contact between the two parts suffering thereby. According to still another embodiment of the oscillator, in cases where the vibrator consists of a plurality of separate pieces of quartz (2'a 2"a) (as shown by Fig. 2) (a so-called mosaic quartz), the back electrode may consist of a flexible metallic mass 4, e. g. a copper-wire net, pressed against the vibrator by an elastic cushion or pad 5.
In order to prevent, in cases where a metal plate is used as the back electrode, undesirable corona discharges from arising on said back electrode, it is advisable so to arrange the layout that the metal plate projects slightly beyond the edge of the piezoelectric resonator and is well rounded on all sides, as shown in Figs. 1 and 2. This arrangement at the same time affords the further advantage that it is possible to operate the oscillator, without hesitation, under relatively very high voltage, this being, as is known, important if it is desired to achieve a particularly high density of output. For, as a result of the use of the design here selected, sparkovers, which would result in the formation of a luminous arc dangerous to the piezoelectric resonator, are avoided.
It is particularly convenient in this connection to make the electrode of such thickness, or at least to make the edge of the electrode of such width, that as homogeneous as possible a cylindrical field arises between the electrode and the grounded outer jacket.
A further protection against such undesirable sparkovers is achieved, as shown in Fig. 4, by providing a length of cylindrical or tapering metal tube 6 coaxial with the piezoelectric resonator, said tube surrounding the piezoelectric resonator and the back electrode whilst being suitably spaced therefrom. The end achieved by the provision of this length of tube is that, in a manner In this position, however, the are no longer constitutes a danger to the quartz and does not in any way jeopardize the useful life of the object of the invention.
The oscillatory system operates at maximum efficiency when not only any radiation of its ultrasonic output in a rearward direction, i. e., by the back electrode, is prevented as far as possible, but, in addition, if also the diameter of the vibrator plate is tuned to the corresponding natural radial frequency. In addition it is desirable to choke as far as possible any radial deflection of the generated vibrations in the direction of the handle. According to a further embodiment of the invention, this aim is achieved by providing in the metal plate located on the radiating side of the piezoelectric resonator one or a plurality of annular grooves 4c whose diameter and depth are selected in accordance with the purpose stated.
In order by special means to render ineffective as far as possible the waste heat inevitably generated in the oscillator in accordance with the invention, and to deflect said waste heat from the closure plate itself, it is possible, in accordance with a further embodiment of the invention, to provide a special filling mass 9 (as shown in Fig. 3) behind the metallic mass, for instance a metal plate, serving as the back electrode, said filling mass being, for electrical reasons, preferably not in direct contact with said metallic mass, through which filling mass 9 the thermal capacity of the structural members of the oscillator is enhanced. A filling mass arranged in this way is particularly effective if its melting-point or point of transformation is in the vicinity of the maximum desired operating temperature and if it at the same time possesses as high as possible a heat of fusion or of transformation. In the case of ultrasonic oscillators used for therapeutic purposes (electric vibrators for massage) it is expedient to employ a filling mass whose melting or transformation point is as near as possible to 37 C., as this is the temperature found most agreeable when physical contact with the instrument takes place. Examples of substances that can be used to constitute such a mass are phenol, lauric acid, capric acid, p-toluidin and similar organic compounds, and also low-melting metallic alloys, or such inorganic salts as sodium thiosulphate; tetracresyl silicate, for instance, and many other substances, can be used as a mass of high thermal capacity.
In stationary treatmen of the human body with ultrasonics, it is often found n cessary to allow the radiation to take effect from several directions 'or over large surfaces, even on pronouncedly curved areas of the body. This can be done by the simultaneous use of a plurality of separate oscillators pressed against the appropriate areas of the body by springs or similar elastic devices or by means of a suitable stand. For the stationary irradiation of pronouncedly curved areas of the body it is proposed in accordance with the invention that an elastically deformable vibrator surface be used comprising a multiplicity of flat-built oscillators, comprising metal plates 1e and resonators 2e of Fig. 6, or metal plates 1] and resonators 2f of Fig. 7 held together by elastic members, springs, rubber, etc., such as indicated by members 18 of Figs. 6 and 7, respectively, flexibly coupling the metal plates 12 or If, respectively. As is appropriate to the widely-varying indications, it is advisable so to adapt the surface of the vibrator that the individual vibrators can, as shown in Fig. 6, be assembled to form a long row, a square, etc., etc. The individual vibrators are in this case independent radiators surrounded by an insulating casing 12 and jointly pressed, by an elastic medium such as a sponge-rubber pad 13, against the area of the body to be treated. It is also possible, for the purposes of such treatment, to press against the appropriate areas of the body an ultrasonic pad or cushion of predetermined form similar to a heating pad, in which cushion the individual vibrators are non-interchangeably interconnected by elastic means, and a common back electrode in the form of a flexible metallic net 4f, which is pressed up by a pad orcushion 5 of a material of low loss-angle (Fig. 7). The whole is covered with a flexible envelope 12. For the purpose of pressing on this sound pad, metal plates of predetermined curvature may be used, said curvature either coinciding with the curvature of the bodily area to be treated or providing the desired focusing of the radiators in this way arranged to radiate convergently. Should it be desired to achieve these effects with a single plate, it is advisable to make the latter of lead. It is also possible to assemble the individual radiators permanently for special, frequentlyrepeated cases such as nasal treatment, treatment of the knee, etc. These devices, and the sound cushions or pads referred to, are secured to the appropriate areas of the body, during treatment, by means of elastic members, springs, elastic bands, etc., or pressed against said areas by a flexibly-operating stand.
Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:
1. In combination, a plurality of piezoelectric resonators, a plurality of metal plates each associated with one of said resonators and firmly connected to one side thereof, means for flexibly connecting said metal plates in juxtaposition to form a flexible mosaic-like surface adapted to transmit ultrasonic waves, electricallyintegral flexible back-electrode means in electrical contact with said resonators on the side thereof remote from said metal plates, and a flexible mat of electrically-insulating material disposed on the side of said backelectrode means remote from said resonators, said combination being adapted, under pressure against said mat, to establish contact between said mosaic-like surface and a curved surface for transmitting said ultrasonic waves thereto.
2. In combination, a plurality of piezoelectric resonators, a plurality of meta] plates each associated with one of said resonators and firmly connected to one side thereof, means for flexibly connecting said metal plates in juxtaposition to form a flexible mosaic-like surface adapted to transmit ultrasonic waves, electrically-integral flexible back-electrode means in electrical contact with said resonators on the side thereof remote from said metal plates, a flexible mat of electrically-insulating spongy material disposed on the side of said back-electrode means remote from said resonators, and a flexible cover of electrically-insulating material covering the side of said mat remote from said electrode means, said combination being adapted, under pressure against said cover, to establish contact between said mosaic-like surface and a curved surface for transmitting said ultra sonic waves thereto.
3. In combination, a plurality of piezoelectric resonators, a plurality of metal plates each associated with one of said resonators and firmly connected to one side thereof, means for flexibly connecting said metal plates in juxtaposition to form a flexibly mosaic-like surface adapted to transmit ultrasonic waves, electrically-integral flexible back-electrode means in electrical contact with said resonators on the side thereof remote from said metal plates, a plurality of electrically-insulating covers each associated with one of said resonators and covering the side of said back-electrode means remote from said resonators, and a flexible mat of electricallyinsulating material disposed on the side of said electrode means remote from said resonators, said combination being adapted, under pressure against said mat, to establish contact between said mosaic-like surface and a curved surface for transmitting said ultrasonic waves thereto.
(References on following page) References Cited in the file of this patent UNITED STATES PATENTS Steinberger Dec. 15, 1936 Sawyer Jan. 11, 1938 Pohlman May 19, 1942 Gruetzmacher June 29, 1943 Hayes Apr. 24, 1945 Beniofi Aug. 6, 1946 Shapiro Oct. 8, 1946 10 Mason Feb. 25, 1947 Washburn Sept. 23, 1947 6 Franklin Aug. 17, 1948 Smoluchowski Jan. 25, 1949 Jaffee Feb. 14, 1950 Holden Feb. 28, 1950 Roberts Mar. 13, 1951 Chess Aug. 14, 1951 Keller Feb. 26, 1952 FOREIGN PATENTS France May 21, 1927 Italy Mar. 3, 1945
US137092A 1950-01-06 1950-01-06 Piezoelectric oscillator or vibrator for ultrasonic waves, especially as an instrument for therapeutical treatment and diagnosis Expired - Lifetime US2728869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US137092A US2728869A (en) 1950-01-06 1950-01-06 Piezoelectric oscillator or vibrator for ultrasonic waves, especially as an instrument for therapeutical treatment and diagnosis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US137092A US2728869A (en) 1950-01-06 1950-01-06 Piezoelectric oscillator or vibrator for ultrasonic waves, especially as an instrument for therapeutical treatment and diagnosis

Publications (1)

Publication Number Publication Date
US2728869A true US2728869A (en) 1955-12-27

Family

ID=22475797

Family Applications (1)

Application Number Title Priority Date Filing Date
US137092A Expired - Lifetime US2728869A (en) 1950-01-06 1950-01-06 Piezoelectric oscillator or vibrator for ultrasonic waves, especially as an instrument for therapeutical treatment and diagnosis

Country Status (1)

Country Link
US (1) US2728869A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102535A (en) * 1960-07-11 1963-09-03 Dailey Ultrasonics Inc Transducer device
US3989965A (en) * 1973-07-27 1976-11-02 Westinghouse Electric Corporation Acoustic transducer with damping means
US3995179A (en) * 1974-12-30 1976-11-30 Texaco Inc. Damping structure for ultrasonic piezoelectric transducer
US4051396A (en) * 1974-02-28 1977-09-27 Channel Products, Inc. Encapsulation to prevent fracture of piezoelectric high voltage mechanism
US4163394A (en) * 1975-06-30 1979-08-07 Siemens Aktiengesellschaft Method of ultrasonic scanning of bodies
US4211950A (en) * 1978-09-13 1980-07-08 Harris Corporation Arrangement for coupling RF energy into piezoelectric transducers
US4269176A (en) * 1977-12-16 1981-05-26 Siemens Aktiengesellschaft Treatment head for electromedical diagnostic or therapeutic treatment of body parts
US4333029A (en) * 1979-09-04 1982-06-01 Baker Industries, Inc. Piezoelectric seismic sensor for intrusion detection
US4499566A (en) * 1981-01-21 1985-02-12 The United States Of America As Represented By The Secretary Of The Navy Electro-ceramic stack
US4721106A (en) * 1984-07-14 1988-01-26 Richard Wolf Gmbh Piezoelectric transducer for destruction of concretions inside the body
US5189332A (en) * 1991-11-18 1993-02-23 Wild John J Flexible energy coupling and associated mounting for piezo electric crystals
US5659220A (en) * 1992-08-13 1997-08-19 Siemens Aktiengesellschaft Ultrasonic transducer
US5989202A (en) * 1997-03-18 1999-11-23 Ten Kabushiki Kaisha Medical ultrasonic generator
US20020026976A1 (en) * 2000-09-07 2002-03-07 Alps Electric Co., Ltd. Ultrasonic vibrator, wet-treatment nozzle, and wet-treatment apparatus
US20120056511A1 (en) * 2010-09-08 2012-03-08 Murata Manufacturing Co., Ltd. Ultrasonic Transducer
EP2317928A4 (en) * 2008-08-27 2015-04-08 Syneron Medical Ltd High power ultrasound transducer
US9199096B2 (en) 2009-12-31 2015-12-01 Zetroz, Inc. Portable ultrasound system

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR622035A (en) * 1926-01-27 1927-05-21 Method and arrangements for improving the efficiency of piezoelectric ultrasonic projectors
US2063951A (en) * 1931-12-04 1936-12-15 George W Pierce Apparatus for transmission and reception
US2105010A (en) * 1933-02-25 1938-01-11 Brush Dev Co Piezoelectric device
US2283285A (en) * 1938-05-25 1942-05-19 Pohlman Reimar Massage
US2323030A (en) * 1939-07-11 1943-06-29 Gruetzmacher Johannes Electrode for piezoelectric crystal oscillators
US2374637A (en) * 1931-09-10 1945-04-24 Harvey C Hayes Supersonic apparatus
US2405187A (en) * 1941-11-07 1946-08-06 Submarine Signal Co Piezoelectric transducer
US2408816A (en) * 1944-02-10 1946-10-08 Maurice M Shapiro Piezoelectric gauge and method of making the same
US2416337A (en) * 1943-06-10 1947-02-25 Bell Telephone Labor Inc Vibration damping circuit
US2427825A (en) * 1943-11-06 1947-09-23 Rca Corp Art of mounting piezoelectric crystals
US2447061A (en) * 1945-07-18 1948-08-17 Cambridge Thermionic Corp Piezoelectric system
US2460153A (en) * 1946-07-30 1949-01-25 Gen Electric Piezoelectric crystal holder
US2497672A (en) * 1945-03-19 1950-02-14 Brush Dev Co Piezoelectric apparatus
US2498737A (en) * 1946-06-07 1950-02-28 William H T Holden Electromechanical transducer
US2545309A (en) * 1948-05-29 1951-03-13 Transducer Corp Weld testing instrument
US2564562A (en) * 1945-11-27 1951-08-14 Gerald E Chess Microphone
US2587482A (en) * 1946-09-06 1952-02-26 Bell Telephone Labor Inc Piezoelectric type switching relay

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR622035A (en) * 1926-01-27 1927-05-21 Method and arrangements for improving the efficiency of piezoelectric ultrasonic projectors
US2374637A (en) * 1931-09-10 1945-04-24 Harvey C Hayes Supersonic apparatus
US2063951A (en) * 1931-12-04 1936-12-15 George W Pierce Apparatus for transmission and reception
US2105010A (en) * 1933-02-25 1938-01-11 Brush Dev Co Piezoelectric device
US2283285A (en) * 1938-05-25 1942-05-19 Pohlman Reimar Massage
US2323030A (en) * 1939-07-11 1943-06-29 Gruetzmacher Johannes Electrode for piezoelectric crystal oscillators
US2405187A (en) * 1941-11-07 1946-08-06 Submarine Signal Co Piezoelectric transducer
US2416337A (en) * 1943-06-10 1947-02-25 Bell Telephone Labor Inc Vibration damping circuit
US2427825A (en) * 1943-11-06 1947-09-23 Rca Corp Art of mounting piezoelectric crystals
US2408816A (en) * 1944-02-10 1946-10-08 Maurice M Shapiro Piezoelectric gauge and method of making the same
US2497672A (en) * 1945-03-19 1950-02-14 Brush Dev Co Piezoelectric apparatus
US2447061A (en) * 1945-07-18 1948-08-17 Cambridge Thermionic Corp Piezoelectric system
US2564562A (en) * 1945-11-27 1951-08-14 Gerald E Chess Microphone
US2498737A (en) * 1946-06-07 1950-02-28 William H T Holden Electromechanical transducer
US2460153A (en) * 1946-07-30 1949-01-25 Gen Electric Piezoelectric crystal holder
US2587482A (en) * 1946-09-06 1952-02-26 Bell Telephone Labor Inc Piezoelectric type switching relay
US2545309A (en) * 1948-05-29 1951-03-13 Transducer Corp Weld testing instrument

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102535A (en) * 1960-07-11 1963-09-03 Dailey Ultrasonics Inc Transducer device
US3989965A (en) * 1973-07-27 1976-11-02 Westinghouse Electric Corporation Acoustic transducer with damping means
US4051396A (en) * 1974-02-28 1977-09-27 Channel Products, Inc. Encapsulation to prevent fracture of piezoelectric high voltage mechanism
US3995179A (en) * 1974-12-30 1976-11-30 Texaco Inc. Damping structure for ultrasonic piezoelectric transducer
US4163394A (en) * 1975-06-30 1979-08-07 Siemens Aktiengesellschaft Method of ultrasonic scanning of bodies
US4269176A (en) * 1977-12-16 1981-05-26 Siemens Aktiengesellschaft Treatment head for electromedical diagnostic or therapeutic treatment of body parts
US4211950A (en) * 1978-09-13 1980-07-08 Harris Corporation Arrangement for coupling RF energy into piezoelectric transducers
US4333029A (en) * 1979-09-04 1982-06-01 Baker Industries, Inc. Piezoelectric seismic sensor for intrusion detection
US4499566A (en) * 1981-01-21 1985-02-12 The United States Of America As Represented By The Secretary Of The Navy Electro-ceramic stack
US4721106A (en) * 1984-07-14 1988-01-26 Richard Wolf Gmbh Piezoelectric transducer for destruction of concretions inside the body
US5189332A (en) * 1991-11-18 1993-02-23 Wild John J Flexible energy coupling and associated mounting for piezo electric crystals
US5659220A (en) * 1992-08-13 1997-08-19 Siemens Aktiengesellschaft Ultrasonic transducer
US5989202A (en) * 1997-03-18 1999-11-23 Ten Kabushiki Kaisha Medical ultrasonic generator
US20020026976A1 (en) * 2000-09-07 2002-03-07 Alps Electric Co., Ltd. Ultrasonic vibrator, wet-treatment nozzle, and wet-treatment apparatus
US20040173248A1 (en) * 2000-09-07 2004-09-09 Alps Electric Co., Ltd. Ultrasonic vibrator, wet-treatment nozzle, and wet-treatment apparatus
EP2317928A4 (en) * 2008-08-27 2015-04-08 Syneron Medical Ltd High power ultrasound transducer
US9199096B2 (en) 2009-12-31 2015-12-01 Zetroz, Inc. Portable ultrasound system
US20120056511A1 (en) * 2010-09-08 2012-03-08 Murata Manufacturing Co., Ltd. Ultrasonic Transducer
US8779649B2 (en) * 2010-09-08 2014-07-15 Murata Manufacturing Co., Ltd. Ultrasonic transducer

Similar Documents

Publication Publication Date Title
US2728869A (en) Piezoelectric oscillator or vibrator for ultrasonic waves, especially as an instrument for therapeutical treatment and diagnosis
US5174280A (en) Shockwave source
KR102000971B1 (en) Device for extracorporeal therapy
US20180099162A1 (en) Apparatus and method for treating electile disfunction applying transversal ultrasound waves
US8162858B2 (en) Ultrasonic medical treatment device with variable focal zone
ES2567269T3 (en) Ultrasonic generator in torsional mode
US5526815A (en) Therapy apparatus for locating and treating a zone located in the body of a life form with acoustic waves
US20080262358A1 (en) Thermally enhanced piezoelectric element
GB2140693A (en) Piezoelectric transducer for the destruction of concretions within an animal body
US4622969A (en) Shock wave matching in therapeutic equipment
US20070167803A1 (en) Thermally enhanced ultrasound transducer system
JP2584584B2 (en) Shock wave generator
US6953439B1 (en) Therapeutic mattress
US2668529A (en) Device for transmitting ultrasound energy
US20190134429A1 (en) Ultrasonic thermal ablation probe
US4823773A (en) Extracorporeal shock wave source with a piezoelectric generator
KR20190090366A (en) Device for extracorporeal therapy
KR101159452B1 (en) Ultrasonic treatment apparatus
JPH05244690A (en) Ultrasonic probe
KR102054002B1 (en) Medical treatment apparatus for arthritis using focused-ultrasound
WO1992018081A1 (en) Ultrasonic cutter
Sheuaskov et al. A phased array antenna for simultaneous thermotherapy and sonography
JP2549673B2 (en) Ultrasound therapy applicator
GB2264420A (en) Electro -acoustic transducers comprising a flexible and sealed transmitting shell
JPH0871078A (en) Ultrasonic generator