WO1996025244A1 - Electrical coupling for piezoelectric ultrasound detector - Google Patents
Electrical coupling for piezoelectric ultrasound detector Download PDFInfo
- Publication number
- WO1996025244A1 WO1996025244A1 PCT/GB1996/000368 GB9600368W WO9625244A1 WO 1996025244 A1 WO1996025244 A1 WO 1996025244A1 GB 9600368 W GB9600368 W GB 9600368W WO 9625244 A1 WO9625244 A1 WO 9625244A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrodes
- detector
- film
- array
- ultrasound
- Prior art date
Links
- 238000002604 ultrasonography Methods 0.000 title claims abstract description 25
- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000011159 matrix material Substances 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 3
- 230000001070 adhesive effect Effects 0.000 claims abstract description 3
- 229920001940 conductive polymer Polymers 0.000 claims description 8
- 239000002861 polymer material Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 7
- 238000009826 distribution Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 15
- 238000000576 coating method Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000002955 isolation Methods 0.000 description 4
- 238000003491 array Methods 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000005062 Polybutadiene Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 206010006187 Breast cancer Diseases 0.000 description 1
- 208000026310 Breast neoplasm Diseases 0.000 description 1
- 208000004434 Calcinosis Diseases 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000000913 Kidney Calculi Diseases 0.000 description 1
- 206010029148 Nephrolithiasis Diseases 0.000 description 1
- 208000001132 Osteoporosis Diseases 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 230000002308 calcification Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006880 cross-coupling reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 210000001525 retina Anatomy 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 210000004872 soft tissue Anatomy 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B06B1/0644—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 a single piezoelectric element
-
- 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
- B06B1/0688—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 with foil-type piezoelectric elements, e.g. PVDF
- B06B1/0692—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 with foil-type piezoelectric elements, e.g. PVDF with a continuous electrode on one side and a plurality of electrodes on the other side
Definitions
- the present invention relates to an ultrasound detector, and in particular to an array type detector for detecting in the 150 kHz to 30MHz range which is typically used in medical and high definition sonar applications.
- ultrasound detectors which comprise a two-dimensional array of discrete detector elements, which may number from 20 or so to several hundred. Aside from the complexity of handling the information output from the individual elements, the known detectors suffer from a very complex or intricate manufacturing process. Typically each element in an array has a discrete electrical coupling.
- PVDF polyvinylidenediflouride
- the present invention provides an ultrasound detector comprising a layer of piezoelectric material having first and second major surfaces, and an array of electrodes adjacent and facing one of the major surfaces, the electrodes being electrically coupled to the material by an ohmic or capacitive coupling.
- the other major surface has a conductive film extending across it to form an electrode pair with each of the electrodes of the array.
- the array may be one-dimensional, but the invention is particularly suited to providing a two dimensional array.
- the preferred materials for forming the detector are PVDF, a homopolymer or co-polymer incorporating PVDF, or a piezo electric composite material.
- the detector of the invention may be readily manufactured by embedding an array of wire or conductive polymer electrodes in an electrically insulating material.
- the piezoelectric film is then bonded to the surface of the electrode/insulating material matrix.
- the piezoelectric film may also be deposited on the matrix, or, particularly in the case of a piezo composite material, it may be injection moulded onto the matrix surface.
- a matching layer may be provided in front of the piezoelectric material layer to minimise acoustic mismatch between the propagation medium in front of the detector and piezoelectric layer.
- a layer of anechoic material may be provided to dissipate or absorb the ultrasound which is transmitted through the piezoelectric layer, to prevent reflection back towards the piezoelectric layer.
- an anechoic material with a high acoustic fractional power dissipation is used.
- the conductive polymer electrodes may also be made of a polymeric material with acoustically engineered properties. Silicone, polyurethane and polybutadiene based polymers can be used to provide anechoic and acoustically engineered materials.
- the insulating material with the electrodes embedded in it may be machined or moulded to provide a surface in which the ends of the electrodes are exposed.
- an ultrasound detector comprising a layer of piezoelectric material having first and second major surfaces, and an array of electrodes adjacent and facing one of the major surfaces, wherein the electrodes are formed of conductive polymer material.
- the conductive polymer electrodes may be in direct electrical contact with the piezoelectric layer or separated from it by an ohmic or capacitive coupling.
- the piezoelectric layer should be in intimate contact with the electrode array and its surrounding matrix. This could be achieved by depositing the piezoelectric material layer onto the electrode/matrix composite body by a coating process.
- An electronic module is connected to the array of electrodes for processing the signals generated by the piezoelectric film.
- the detector that is the piezoelectric layer with the backing material (s) and electrodes
- the detector arrays of different types may be substituted, and damaged arrays replaced. For example, measurement of the high intensity field of an ultrasound source used in medical lithotripters is likely to damage the detector.
- the invention provides a device which can be manufactured economically to meet the needs of a two-dimensional array detector for rapid measurement of the sound pressure distribution in both amplitude and phase (or some other waveform feature) of an ultrasound field and also for assessing the ultrasound field generated by a scanner, both of which are particularly important in medical applications. This is of use not only for diagnostic purposes but also in assessing therapeutic fields such as the acoustic fields emitted by lithotripters to fragment kidney stones.
- an important additional medical application of such an array would be its use as a receiver in transmission ultrasonography in applications involving structural determinations such as osteoporosis screening, and in breast cancer screening where the detection of small calcifications in human breast tissue is required.
- the receiver (or transmitter) could be mechanically manouevred to fill-in missing data points, or electrically phased to achieve this.
- Figure 1 is a cross-section through an ultrasound detector forming an embodiment of the invention
- Figure 2 is a cross-section along the line II-II of Figure 1
- Figure 3 illustrates a modification of the embodiment of Figure 1
- Figure 4 is a schematic diagram illustrating a method of processing signals from the detectors of Figures 1 and 3 in a field measurement system
- Figure 5 illustrates a method of processing signals in a real-time imaging system.
- a detector 1 comprises two-dimensional array of pin-like electrodes 2 embedded in an insulating matrix 4 to form a composite body 5 which is surrounded by an outer electrode casing 6 which provides a ground connection.
- the material of the matrix surrounding the electrodes is preferably polyurethane or polybutadiene based but a variety of materials may be used if they meet the requirements of providing suitable electrical isolation between the pins and have suitable acoustic properties, for example some epoxy resins or silicone rubbers
- a continuous PVDF film 8 has one of its major surfaces 10 bonded to an upper surface 14 of the body 5 by an electrically non-conducting adhesive 12.
- the opposite major surface 16 of the PVDF film 8 is coated with a gold electrode film 18 which is electrically connected to the casing 6 by a conducting silver loaded paint or epoxy resin 20.
- One end 22 of the electrode pins 2 project from the body 5 to enable connection to associated electronics (not shown) which monitor the signal generated between each pin 2 and the gold electrode film 18 as the PVDF film 8 is stressed by ultrasound.
- the projecting ends 22 of the pins 2 are surrounded by the casing 6.
- a connector (not shown) may be provided to mate with the pin ends 22, or wires or other connections may be attached directly to the pin ends 22.
- the pin ends may be polished flat in the matrix to provide an array of pads for touch or pressure connection.
- An integrated package of electronic buffers and multiplexers, etc. may be coupled directly to the pins by mounting them on the body 5 (the electrodes 2 being flush with the major surfaces of the body 5 at both ends of the electrodes), or via a matting having uniaxial conductors distributed throughout - as commonly used in liquid crystal display technology, or one of similar such proprietary connection containing a regular array of through connectors, e. g. ISOCON (trade mark) connector mats produced by Circuit Components Inc. of Arizona, USA.
- the end surface 24 of the pins 2 are coupled electrically (via the ohmic/capacitive coupling of the adhesive layer 12) only to the area immediately in front of them, and fringing effects from the surrounding area are not significant.
- the effect is a response which is similar to that expected from using an array of discrete PVDF elements.
- piezoelectric material such as PVDF or a piezo composite and an appropriate infilling material 4 such as an electrically insulating polymer between the electrodes 2 provides good electrical and acoustic insulation between the regions coupled to the respective electrodes 2. It is felt that a pure ceramic piezoelectric material, for example, may result in greater coupling between regions and hence performance would be degraded and more sophisticated signal processing would be required at the very least.
- the device may be manufactured by embedding an array of electrodes 2 in the matrix 4, within the casing 6.
- the composite body 5 then machined flat on one surface for adhering the PVDF film 8.
- the PVDF film is typically supplied with an electrode coating on each major surface, and in this case one of these is stripped off for bonding to the body 5.
- PVDF film supplied with an electrode coating only on one (the outer) side may be used, or uncoated film may be used and an electrode film deposited after fabrication of the device.
- Silver paint 20 then connects the outer electrode coating 18 to the casing 6.
- PVDF film is available in a thickness of 9 to 110 microns, and a thickness of about 28 microns has been found suitable.
- the electrode cross-section will depend on the application, including the array size and sensitivity, but an electrode diameter of 0.1 to 1mm and in particular 0.5mm is suitable.
- the electrodes may be spaced apart by less than the electrode diameter.
- the array size and shape is also variable. Circular, square and rectangular arrays of, fro example, 1024 or 8192 elements could be used.
- the polymer matrix 4 may be used to bond directly to the PVDF film 8, the electrodes 2 being spaced from the film 8 by a thin layer of the polymer.
- the detector may present a curved surface, the pins 2 and insulating polymer body 4 being moulded or machined to form the curved surface to which the PVDF film is attached.
- PVDF co-polymer coating may be deposited in situ, i. e. onto the upper surface of the body 5, a conductive coating 18 then being deposited on the PVDF co-polymer layer.
- PVDF is usually supplied pre-polled (it is heated to above its Curie point and exposed to an intense electric field to render it piezoelectric). If an unpolled film is used (or deposited, in situ), then it may be polled by heating (for example in an oil bath) and applying the required electric potential between the electrodes 2 and the outer electrode coating 18. Polling in situ may have the advantage that the PVDF film is activated only in the regions immediately opposite the electrode 2, giving improved inter-element isolation.
- the electrodes 2 may be wire electrodes or strips of conductive polymer, such as carbon impregnated silicone rubber as used in electrically coupling liquid crystal displays to printed circuit boards.
- the acoustic properties of the insulating matrix 4 and the conductive polymer electrodes 2 may be matched to the acoustic properties of the medium that the detector is in contact with (usually water or a water-like material such as human soft tissue).
- the insulating matrix can be tailored to have a high acoustic fractional power dissipation In this way the face of the array can be made as acoustically invisible as possible and/or cross-coupling between elements minimised.
- a two dimensional array of conductive polymer strips in a non-conducting matrix may be used as the body 5 to connect to the PVDF film, or to couple to the underside of the body 5.
- the electrodes 2 are electrically shielded from each other by a thin metal honeycomb 26 of electrically conductive material, for example metal, which is connected to ground.
- An air gap may also be provided to provide acoustic isolation. This will provide additional electrical and acoustic isolation between the electrodes 2 and is illustrated in Figure 3.
- the detector might be mounted on the outer surface of a cathode ray tube with the electrode pins touching the outer surface of the tube or extending through the tube wall.
- the electrical charge on the pins could be read by scanning the pin ends with an electron beam.
- the charge distribution on the pin ends may also be read by an array of detectors using solid-state techniques, such as a field emission display device or charge coupled device.
- this shows a schematic circuit diagram for reading and analysing the signal produced by the detector 1.
- This system is particularly suited for a field measurement system, in which the ultrasound field distribution of a source 38 is to be determined.
- the signal generated in the individual electrodes 2 of the detector 1 is read by a multiplexor/addressor circuit 30 coupled to the electrodes 2 by buffer electronics 32.
- the analogue signals are digitised by an analogue to digital converter 34 and fed to a central processor 36.
- Central processor 36 receives a timing or synchronism signal from a timing signal detector 37 linked to the ultrasound transmitter 38, to initiate scanning of the electrodes 2 after a suitable time lapse from the ultrasound generation at the transmitter 38.
- the timing signal may be supplied direct by the ultrasound transmitter, or it may be detected remotely.
- the location of the detector 1 relative to the source 38 may be varied by a control 39 to measure the field more extensively in two dimensions and/or in three dimensions. "Real-time" addressing is not required and so the electrodes 2 may be addressed in turn by the multiplexor/addressor 30 at a relatively slow rate as the transmitter 38 is operated so that the signal waveform at each electrode is detected in sequential field transmissions.
- the electronic circuitry for detecting the full signal waveform at each electrodes may be impractical.
- an array of peak detectors 40 captures the peak signal generated in each electrode, and the outputs of the peak detectors 40 are processed by the central processor 36' .
- the peak detectors 40 may be refreshed at pre-determined intervals in synchronism with the transmitter pulses and at a suitable frame rate, such as 25 or 50Hz for visual imaging. This system could also be used for field measurement.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96903100A EP0809542B1 (en) | 1995-02-16 | 1996-02-16 | Electrical coupling for piezoelectric ultrasound detector |
GB9717274A GB2314205A (en) | 1995-02-16 | 1996-02-16 | Electrical coupling for piezoelectric ultrasound detector |
US08/875,982 US6094988A (en) | 1995-02-16 | 1996-02-16 | Electrical coupling for piezoelectric ultrasound detector |
DE69605770T DE69605770T2 (en) | 1995-02-16 | 1996-02-16 | ELECTRICAL COUPLING FOR PIEZOELECTRIC ULTRASONIC DETECTOR |
AT96903100T ATE187904T1 (en) | 1995-02-16 | 1996-02-16 | ELECTRICAL COUPLING FOR PIEZOELECTRIC ULTRASONIC DETECTOR |
AU47251/96A AU720051B2 (en) | 1995-02-16 | 1996-02-16 | Electrical coupling for piezoelectric ultrasound detector |
NO973773A NO973773L (en) | 1995-02-16 | 1997-08-15 | Electrical connection for piezoelectric ultrasonic detector |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9502999.7 | 1995-02-16 | ||
GBGB9502999.7A GB9502999D0 (en) | 1995-02-16 | 1995-02-16 | Ultrasound detector |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996025244A1 true WO1996025244A1 (en) | 1996-08-22 |
Family
ID=10769679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1996/000368 WO1996025244A1 (en) | 1995-02-16 | 1996-02-16 | Electrical coupling for piezoelectric ultrasound detector |
Country Status (8)
Country | Link |
---|---|
US (1) | US6094988A (en) |
EP (1) | EP0809542B1 (en) |
AT (1) | ATE187904T1 (en) |
AU (1) | AU720051B2 (en) |
DE (1) | DE69605770T2 (en) |
GB (2) | GB9502999D0 (en) |
NO (1) | NO973773L (en) |
WO (1) | WO1996025244A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6012779A (en) * | 1997-02-04 | 2000-01-11 | Lunar Corporation | Thin film acoustic array |
WO2007072026A1 (en) * | 2005-12-23 | 2007-06-28 | De La Rue International Limited | Document monitoring device |
EP2283935A1 (en) * | 2009-08-13 | 2011-02-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Ultrasound converter system and method for its operation |
CN110191765A (en) * | 2016-11-11 | 2019-08-30 | 诺沃声波有限公司 | Ultrasonic transducer |
EP3817075A1 (en) * | 2019-10-29 | 2021-05-05 | Continental Automotive GmbH | Piezoceramic ultrasonic transducer |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000114918A (en) * | 1998-10-05 | 2000-04-21 | Mitsubishi Electric Corp | Surface acoustic wave device and its manufacture |
US6980017B1 (en) * | 1999-03-10 | 2005-12-27 | Micron Technology, Inc. | Test interconnect for bumped semiconductor components and method of fabrication |
US6360611B1 (en) * | 2000-04-21 | 2002-03-26 | Kohji Toda | Device for ultrasound radiation into a material |
WO2002005868A2 (en) * | 2000-07-13 | 2002-01-24 | Transurgical, Inc. | Thermal treatment methods and apparatus with focused energy application |
US20020068885A1 (en) * | 2000-07-13 | 2002-06-06 | Harhen Edward Paul | Energy application with inflatable annular lens |
US6763722B2 (en) * | 2001-07-13 | 2004-07-20 | Transurgical, Inc. | Ultrasonic transducers |
US6707236B2 (en) * | 2002-01-29 | 2004-03-16 | Sri International | Non-contact electroactive polymer electrodes |
US20040082859A1 (en) | 2002-07-01 | 2004-04-29 | Alan Schaer | Method and apparatus employing ultrasound energy to treat body sphincters |
JP4104445B2 (en) * | 2002-12-12 | 2008-06-18 | 株式会社イデアルスター | Linear device |
CN1764419A (en) | 2003-02-20 | 2006-04-26 | 普罗里森姆股份有限公司 | Cardiac ablation devices |
US20050075571A1 (en) * | 2003-09-18 | 2005-04-07 | Siemens Medical Solutions Usa, Inc. | Sound absorption backings for ultrasound transducers |
US10499937B2 (en) | 2006-05-19 | 2019-12-10 | Recor Medical, Inc. | Ablation device with optimized input power profile and method of using the same |
CA2653202A1 (en) * | 2006-05-25 | 2008-06-05 | Ultra-Scan Corporation | Biometrical object reader having an ultrasonic wave manipulation device |
US20080228074A1 (en) * | 2007-03-12 | 2008-09-18 | Ketterling Jeffrey A | System and method for measuring acoustic pressure at multiple locations simultaneously |
EP2174360A4 (en) | 2007-06-29 | 2013-12-11 | Artificial Muscle Inc | Electroactive polymer transducers for sensory feedback applications |
WO2010080886A1 (en) | 2009-01-09 | 2010-07-15 | Recor Medical, Inc. | Methods and apparatus for treatment of mitral valve in insufficiency |
EP2239793A1 (en) | 2009-04-11 | 2010-10-13 | Bayer MaterialScience AG | Electrically switchable polymer film structure and use thereof |
KR20140008416A (en) | 2011-03-01 | 2014-01-21 | 바이엘 인텔렉쳐 프로퍼티 게엠베하 | Automated manufacturing processes for producing deformable polymer devices and films |
US9195058B2 (en) | 2011-03-22 | 2015-11-24 | Parker-Hannifin Corporation | Electroactive polymer actuator lenticular system |
WO2013142552A1 (en) | 2012-03-21 | 2013-09-26 | Bayer Materialscience Ag | Roll-to-roll manufacturing processes for producing self-healing electroactive polymer devices |
WO2013192143A1 (en) | 2012-06-18 | 2013-12-27 | Bayer Intellectual Property Gmbh | Stretch frame for stretching process |
US9590193B2 (en) | 2012-10-24 | 2017-03-07 | Parker-Hannifin Corporation | Polymer diode |
DE102013201928A1 (en) | 2013-02-06 | 2014-08-07 | Richard Wolf Gmbh | Electroacoustic transducer for producing acoustic waves e.g. shock waves in medical field, has piezoelectric elements whose one side is provided with electrode which is electrical insulated in relation to piezoelectric elements |
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US4555953A (en) * | 1984-04-16 | 1985-12-03 | Paolo Dario | Composite, multifunctional tactile sensor |
US4755708A (en) * | 1984-05-30 | 1988-07-05 | Siemens Aktiengesellschaft | Hydrophone |
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-
1995
- 1995-02-16 GB GBGB9502999.7A patent/GB9502999D0/en active Pending
-
1996
- 1996-02-16 AU AU47251/96A patent/AU720051B2/en not_active Ceased
- 1996-02-16 AT AT96903100T patent/ATE187904T1/en not_active IP Right Cessation
- 1996-02-16 US US08/875,982 patent/US6094988A/en not_active Expired - Fee Related
- 1996-02-16 DE DE69605770T patent/DE69605770T2/en not_active Expired - Fee Related
- 1996-02-16 WO PCT/GB1996/000368 patent/WO1996025244A1/en active IP Right Grant
- 1996-02-16 EP EP96903100A patent/EP0809542B1/en not_active Expired - Lifetime
- 1996-02-16 GB GB9717274A patent/GB2314205A/en not_active Withdrawn
-
1997
- 1997-08-15 NO NO973773A patent/NO973773L/en not_active Application Discontinuation
Patent Citations (5)
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US4555953A (en) * | 1984-04-16 | 1985-12-03 | Paolo Dario | Composite, multifunctional tactile sensor |
US4755708A (en) * | 1984-05-30 | 1988-07-05 | Siemens Aktiengesellschaft | Hydrophone |
US4914565A (en) * | 1987-05-22 | 1990-04-03 | Siemens Aktiengesellschaft | Piezo-electric transducer having electrodes that adhere well both to ceramic as well as to plastics |
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Cited By (7)
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US6012779A (en) * | 1997-02-04 | 2000-01-11 | Lunar Corporation | Thin film acoustic array |
US6305060B1 (en) | 1997-02-04 | 2001-10-23 | Ge Lunar Corporation | Method of making a thin film acoustic array |
WO2007072026A1 (en) * | 2005-12-23 | 2007-06-28 | De La Rue International Limited | Document monitoring device |
EP2283935A1 (en) * | 2009-08-13 | 2011-02-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Ultrasound converter system and method for its operation |
CN110191765A (en) * | 2016-11-11 | 2019-08-30 | 诺沃声波有限公司 | Ultrasonic transducer |
EP3538289B1 (en) * | 2016-11-11 | 2022-06-01 | Novosound Ltd | Ultrasound transducer |
EP3817075A1 (en) * | 2019-10-29 | 2021-05-05 | Continental Automotive GmbH | Piezoceramic ultrasonic transducer |
Also Published As
Publication number | Publication date |
---|---|
AU4725196A (en) | 1996-09-04 |
GB9502999D0 (en) | 1995-04-05 |
EP0809542B1 (en) | 1999-12-22 |
GB9717274D0 (en) | 1997-10-22 |
US6094988A (en) | 2000-08-01 |
NO973773L (en) | 1997-10-15 |
DE69605770D1 (en) | 2000-01-27 |
DE69605770T2 (en) | 2000-07-20 |
EP0809542A1 (en) | 1997-12-03 |
ATE187904T1 (en) | 2000-01-15 |
GB2314205A (en) | 1997-12-17 |
NO973773D0 (en) | 1997-08-15 |
AU720051B2 (en) | 2000-05-25 |
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