CN103341241B - A kind of high-intensity focusing ultrasonic transducer array - Google Patents
A kind of high-intensity focusing ultrasonic transducer array Download PDFInfo
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- CN103341241B CN103341241B CN201310312076.3A CN201310312076A CN103341241B CN 103341241 B CN103341241 B CN 103341241B CN 201310312076 A CN201310312076 A CN 201310312076A CN 103341241 B CN103341241 B CN 103341241B
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Abstract
The invention discloses a kind of high-intensity focusing ultrasonic transducer array, comprise a ball crown type rigid cage and several ultrasonic transducers, a ultrasonic transducer is placed separately by the central authorities of ball crown type rigid cage, all the other ultrasonic transducer Discrete Distribution are on some layers of concentric ring centered by this ultrasonic transducer, angular separation between each circular layer is all unequal, interval between each circular layer and with the spacing of adjacent ultrasonic transducer in ring within 5mm, the initial ultrasonic transducers locations of every layer of concentric ring is random and determine, each ultrasonic transducer has independently electric excitation signal feeder line, be connected to phased signal excitation system respectively.The present invention is by calculating phase place and the voltage amplitude distribution of ultrasonic transducer based on the focus mode synthetic method of pseudo inverse matrix theory, realize acoustic beam electron focusing and scanning, produce the required sound field indicators pattern such as single focus or multifocal, the Fast Heating being applied to human body internal object tumor focus melts.
Description
Technical field
The present invention relates to and utilize the supersonic vibration high strength sound field of inverse piezoelectric effect to export field, specifically, relate to a kind of high-intensity focusing ultrasonic transducer array being applied to high-intensity focus supersonic tumor treatment.
Background technology
Along with the development of ultrasonic technique, the aerial application of high power sound wave is increasingly extensive.In biomedical engineering, the fields such as ultrasonic medical technology, in order to obtain higher-strength sound field, the active self-focusing of many employing curved surfaces at present, sound lens focusing, complex array self-focusing, the modes such as phase array focusing, the obtain manner of this several high strength sound field all has application at multiple production field, substantially the needs of production application can be met, but also come with some shortcomings, the active self-focusing of curved surface and sound lens focusing mode, ultrasonic energy low conversion rate, focusing acoustical power is little, especially also to there is difficulty of processing large for the active self-focusing of curved surface, the problems such as cost is higher, although it is large that complex array self-focusing and phase array focusing focus on acoustical power, but also there is ultrasonic energy low conversion rate, power consumption is high, volume is large, be not easy to the problems such as mobile.
High intensity focused ultrasound phased array is one of critical component of phase control-type high-intensity focus supersonic tumor therapy system.By regulating and controlling excitation phase and the amplitude of wherein array element arbitrarily, external supersonic can be realized in human body, converge at one or more focus, high-strength sound field region is formed in target area, and then make non-normal tissue's cell at focus place rapid temperature increases (5 ~ 10 seconds Nei Wenduda more than 65 DEG C) and coagulation necrosis within very short time, and the normal structure outside focus only has a small amount of energy deposition and damage little.But in the surgical operation process of reality, if the distance between each ultrasonic energy unit is comparatively large, spatial distribution is compact not, easily produces larger secondary lobe when electron focusing and scanning, normal structure outside target area may be caused to be heated excessively, and harm patient normal structure is healthy.
In order to overcome the deficiency of above high strength sound field acquiring technology, publication number is the high-intensity focused ultrasound spherical phased array that patent document discloses a kind of array element dense distribution ringwise of CN1775327, this phased array is made up of the array element of a large aperture rigidity ball-crown body and several Discrete Distribution, the detection probe that the central circular hole of ball-crown body is ultrasound positioning device provides installing space, all array element is distributed in on the some layers of concentric ring that are initial point of ball-crown body center discretely, angular separation between each circular layer is equal, the initial element position of every one deck concentric ring is random and determine, all the other array elements then in succession by etc. angular separation be evenly distributed on concentric ring, each array element all has independently electric excitation signal feeder line, be connected to phased signal excitation system respectively." this phased array has been owing to having installed the detection probe of ultrasound positioning device in the central circular hole of ball-crown body; cause focus energy when beam axis focuses on not concentrated; the distance (i.e. focus scanning scope) of the beam axis of focus position skew is simultaneously restricted, and affects the therapeutic domain of this transducer; Each array element branch takes the angular separation between each circular layer equal in addition, cause the adjacent array element ring spacing of inner circular layer larger than the adjacent array element ring spacing of outer circular layer, the secondary lobe produced during phase array focusing is that densely arranged phased array is large than array element under the same terms, affects focusing effect.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of high-intensity focusing ultrasonic transducer array with sandwich type structural ultrasonic transducer, for the phase control-type high intensity focused ultrasound system that MRI guides, the present invention includes a ball crown type rigid cage and several are connected in ultrasonic transducer in ball crown type rigid cage.
The coupling layer that ultrasonic transducer comprises bolt, back shroud, piezoelectric ceramic piece, electrode slice, horn, swivel sleeve, oscillating plate and is bonded on oscillating plate.The back shroud, piezoelectric ceramic piece, electrode slice and the horn that are set in successively on bolt are connected clamping by bolt by back shroud and horn, constitute the energy conversion part of ultrasound transducer array, the excitation power supply signal that excitation power supply exports is converted to the ultrasonic vibrational energy of ultrasonic transducer horn front end.In addition horn is provided with the ring flange connected with ball crown type rigid cage.Swivel sleeve is arranged on the front end of horn by welding or thread connection, or swivel sleeve and horn manufacture an one-piece parts, oscillating plate is by welding or the bonding front end being arranged on swivel sleeve, coupling layer is bonded in the front end of oscillating plate, and the material of coupling layer is foam plastics or epoxy resin.The extensional vibration that energy conversion part produces is delivered to through swivel sleeve the bending vibration being converted to oscillating plate and coupling layer after oscillating plate, bending vibration is that ultrasound wave is easy to one of vibration mode propagated with Air Coupling most, be conducive to the propagation of ultrasonic vibrational energy from oscillating plate to air, the coupling layer that oscillating plate front end is pasted in addition improves the transmission coefficient of ultrasonic vibrational energy from oscillating plate to air, is more conducive to the realization of the high-strength sound field in oscillating plate front.Oscillating plate is consistent with ultrasonic transducer Natural Frequency of Longitudinal Vibration with the bending vibration natural frequency of coupling layer, after the signal of telecommunication of the electrode slice access excitation power supply of ultrasonic transducer, ultrasonic transducer is operated in its natural frequency point, ultrasound transducer system forms resonance, and the bending vibration amplitude of oscillating plate and coupling layer reaches maximum.
Ball crown type rigid cage is provided with several for the hole of installing ultrasonic transducer, radius of curvature R=the L1+L2+L3 of ball crown type rigid cage, wherein L1 is the focusing minimum-depth of this phased array, L2 is the axial scan scope of this phased array, L3 is the distance in ultrasonic transducer between coupling layer to fixed flange, the f value of ball crown type rigid cage meets 0.70≤f value≤0.85, and wherein f value is the radius of curvature R of rigid cage spherical crown and the ratio of spherical crown base diameter D.
A ultrasonic transducer is placed separately by the central authorities of ball crown type rigid cage, all the other ultrasonic transducer Discrete Distribution are on some layers of concentric ring centered by this ultrasonic transducer, angular separation between each circular layer is all unequal, angular separation is centered by the ultrasonic transducer of ball crown type rigid cage central authorities, with the corner dimension in circular layer between two ultrasonic transducers, interval between each circular layer and with the spacing of adjacent ultrasonic transducer in ring within 5mm, the initial ultrasonic transducers locations of every layer of concentric ring is random and determine, all the other ultrasonic transducers in succession by etc. angular separation be closely evenly distributed on concentric ring, each ultrasonic transducer has independently electric excitation signal feeder line, be connected to phased signal excitation system respectively.The operating frequency of all ultrasonic transducers is all identical with the excitation power supply signal frequency of all ultrasonic transducers, each excitation power supply signal is independent controlled, phase place and voltage amplitude different, by calculating phase place and the voltage amplitude combination of ultrasonic transducer based on the focus mode synthetic method of pseudo inverse matrix theory, after ultrasonic transducer is energized power supply signal excitation, the sound wave of radiation superposes in three dimensions, the wavefront curvature of sound wave and center can be made to change, realize electron focusing and the scanning of acoustic beam, single focus needed for generation or multifocal sound field indicators pattern, the Fast Heating being applied to human body internal object tumor focus melts.
Compare with the high-intensity focused ultrasound spherical phased array of array element dense distribution ringwise, ultrasonic transducer in this high-intensity focusing ultrasonic transducer array have employed sandwich type structural, there is power capacity large, ultrasonic vibrational energy conversion ratio is high, the advantage that sound field output intensity is high, action time tumor focus in patient body being added to heating ablation is short, the operation decreasing patient is painful, also there is novel structure in addition simple, overall volume is little, conveniently moving, sweep limits is large, difficulty of processing is little, production cost comparatively, the advantages such as long service life, be conducive to its industrialized development, have a extensive future.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of ball crown type rigid cage of the present invention.
Fig. 3 is the structural representation of ultrasonic transducer in the present invention.
Number in the figure illustrates: 1. ball crown type rigid cage, 2. ultrasonic transducer, 3. bolt, 4. back shroud, 5. piezoelectric ceramic piece, 6. electrode slice, 7. horn, 8. ring flange, 9. swivel sleeve, 10. oscillating plate, 11. coupling layers.
Detailed description of the invention
embodiment 1
Shown in composition graphs 1-3, a kind of high-intensity focusing ultrasonic transducer array, comprises a ball crown type rigid cage 1 and 37 sandwich ultrasonic transducers 2 be connected in ball crown type rigid cage 1.The coupling layer 11 that each ultrasonic transducer 2 includes bolt 3, back shroud 4, piezoelectric ceramic piece 5, electrode slice 6, horn 7, swivel sleeve 9, oscillating plate 10 and is bonded on oscillating plate 10.The back shroud 4 be set in successively on bolt 3, piezoelectric ceramic piece 5, electrode slice 6 and horn 7 are connected clamping by bolt 3 by back shroud 4 and horn 7, constitute the energy conversion part of ultrasonic transducer 2.Swivel sleeve 9 is arranged on the front end of horn 7 by thread connection, and oscillating plate 10 is arranged on the front end of swivel sleeve 9 by welding, and coupling layer 11 is bonded in the front end of oscillating plate 10, and the material of coupling layer 11 is epoxy resin.Ultrasonic transducer 2 piezoelectric ceramics section diameter 12mm, piezoelectric ceramic piece 5 material is PZT-8, be of a size of: Ф 12 × Ф 5 × 3mm, horn 7 sections of diameter 7mm, swivel sleeve 9 is end external diameter 14mm greatly, large end internal diameter 10mm, and transducer natural frequency is 40.5KHz, impedance is 43 ohm, and dynamic electric resistor is 16.5 ohm.
Radius of curvature R=the L1+L2+L3 of ball crown type rigid cage 1, wherein L1 is the focusing minimum-depth of this phased array, L2 is the axial scan scope of this phased array, the f value of ball crown type rigid cage 1 meets 0.70≤f value≤0.85, wherein f value is the radius of curvature R of ball crown type rigid cage 1 and the ratio of spherical crown base diameter D, and L3 is the distance in ultrasonic transducer 2 between coupling layer 11 to fixed flange 8.
Screw is used ultrasonic transducer 2 and ball crown type rigid cage 1 to be linked together by the ring flange 8 in horn 7, a ultrasonic transducer 2 is placed separately by the central authorities of ball crown type rigid cage 1, all the other ultrasonic transducer 2 Discrete Distribution are on 4 layers of concentric ring centered by this ultrasonic transducer 2, ultrasonic transducer 2 centered by ground floor, angular separation is 0 °; The second layer has 6 ultrasonic transducers 2, and angular separation is 60 °; Third layer has 12 ultrasonic transducers 2, and angular separation is 30 °; 4th layer has 18 transducers, and angular separation is 20 °.
In an embodiment of the present invention, the focusing minimum-depth L1=3.5cm of this array, axial scan range L 2=3.2cm, the coupling layer 11 of ultrasonic transducer 2 arrives the distance L3=2.5cm between fixed flange 8, therefore radius of curvature R=the L1+L2+L3=9.2cm of ball crown type rigid cage 1, the f value of ball crown type rigid cage 1 is taken as 0.8, its spherical crown base diameter D=11.5cm.
Each ultrasonic transducer 2 has independently electric excitation signal feeder line, is connected to phased signal excitation system respectively.The operating frequency of all ultrasonic transducers 2 is all identical with the excitation power supply signal frequency of all ultrasonic transducers 2, each excitation power supply signal is independent controlled, phase place and voltage amplitude different, by calculating phase place and the voltage amplitude combination of each ultrasonic transducer 2 based on the focus mode synthetic method of pseudo inverse matrix theory, after ultrasonic transducer 2 is energized power supply excitation, the sound wave of radiation superposes in three dimensions, the wavefront curvature of sound wave and center are changed, realize electron focusing and the scanning of acoustic beam, single focus needed for generation or multifocal sound field indicators pattern, the Fast Heating being applied to human body internal object tumor focus melts.
Claims (7)
1. a high-intensity focusing ultrasonic transducer array, is characterized in that: comprise a ball crown type rigid cage and several ultrasonic transducers, ball crown type rigid cage is provided with several for the hole of installing ultrasonic transducer, the coupling layer that ultrasonic transducer comprises bolt, back shroud, piezoelectric ceramic piece, electrode slice, horn, swivel sleeve, oscillating plate and is bonded on oscillating plate, the back shroud, piezoelectric ceramic piece, electrode slice and the horn that are set in successively on bolt are connected clamping by bolt by back shroud and horn, swivel sleeve is arranged on the front end of horn, oscillating plate is arranged on the front end of swivel sleeve, and coupling layer is bonded in the front end of oscillating plate, a ultrasonic transducer is placed separately by the central authorities of ball crown type rigid cage, all the other ultrasonic transducer Discrete Distribution are on some layers of concentric ring centered by this ultrasonic transducer, angular separation between each circular layer is all unequal, interval between each circular layer and with the spacing of adjacent ultrasonic transducer in ring within 5mm, the initial ultrasonic transducers locations of every layer of concentric ring is random and determine, all the other ultrasonic transducers in succession by etc. angular separation be closely evenly distributed on concentric ring, each ultrasonic transducer has independently electric excitation signal feeder line, be connected to phased signal excitation system respectively, radius of curvature R=the L1+L2+L3 of described ball crown type rigid cage, wherein L1 is the focusing minimum-depth of this phased array, L2 is the axial scan scope of this phased array, L3 is the distance in ultrasonic transducer between coupling layer to fixed flange, the f value of ball crown type rigid cage meets 0.70≤f value≤0.85, and wherein f value is the radius of curvature R of rigid cage spherical crown and the ratio of spherical crown base diameter D, the operating frequency of all ultrasonic transducers is all identical with the excitation power supply signal frequency of all ultrasonic transducers, each excitation power supply signal is independent controlled, phase place and voltage amplitude different, by calculating phase place and the voltage amplitude combination of array element based on the focus mode synthetic method of pseudo inverse matrix theory, realize electron focusing and the scanning of acoustic beam, the single focus needed for generation or multifocal sound field indicators pattern.
2. high-intensity focusing ultrasonic transducer array according to claim 1, is characterized in that: the swivel sleeve of described ultrasonic transducer and horn manufacture an one-piece parts.
3. high-intensity focusing ultrasonic transducer array according to claim 1, is characterized in that: the swivel sleeve of described ultrasonic transducer is welded on the front end of horn.
4. high-intensity focusing ultrasonic transducer array according to claim 1, is characterized in that: the swivel sleeve of described ultrasonic transducer is by the front end of thread connection in horn.
5. high-intensity focusing ultrasonic transducer array according to claim 1, is characterized in that: the oscillating plate of described ultrasonic transducer is welded on the front end of swivel sleeve.
6. high-intensity focusing ultrasonic transducer array according to claim 1, is characterized in that: the material of the coupling layer of described ultrasonic transducer is foam plastics.
7. high-intensity focusing ultrasonic transducer array according to claim 1, is characterized in that: the material of the coupling layer of described ultrasonic transducer is epoxy resin.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103754820B (en) * | 2013-12-27 | 2015-11-25 | 浙江大学 | Based on sound field synthesis and the parallel operation device of ultrasonic transducer annular array |
| CN106076450B (en) * | 2016-06-03 | 2018-07-20 | 杭州电子科技大学 | A kind of particle suspension dynamic focusing heating system and its heating means |
| CN109031318A (en) * | 2018-06-05 | 2018-12-18 | 中国计量大学 | Submarine target acoustic imaging method based on spheric array |
| CN109431544A (en) * | 2018-12-24 | 2019-03-08 | 深圳先进技术研究院 | Sound field fusing device |
| CN112967709B (en) * | 2021-02-20 | 2022-11-25 | 河北工业大学 | Phase control method based on lossless cranial nerve stimulation focusing sound field |
| CN115821000A (en) * | 2022-11-21 | 2023-03-21 | 西北工业大学 | Phased array based focused ultrasonic cavitation shot blasting device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775327A (en) * | 2005-12-01 | 2006-05-24 | 上海交通大学 | Wide focal domain phased array focusing ultrasonic transducer |
| CN101828960A (en) * | 2010-05-07 | 2010-09-15 | 上海交通大学 | High-intensity focused ultrasound spherical phased array with array elements annually and intensively distributed |
| CN203342224U (en) * | 2013-07-24 | 2013-12-18 | 苏州科技学院 | High-intensity focused ultrasonic transducer array |
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| US9623266B2 (en) * | 2009-08-04 | 2017-04-18 | Insightec Ltd. | Estimation of alignment parameters in magnetic-resonance-guided ultrasound focusing |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775327A (en) * | 2005-12-01 | 2006-05-24 | 上海交通大学 | Wide focal domain phased array focusing ultrasonic transducer |
| CN101828960A (en) * | 2010-05-07 | 2010-09-15 | 上海交通大学 | High-intensity focused ultrasound spherical phased array with array elements annually and intensively distributed |
| CN203342224U (en) * | 2013-07-24 | 2013-12-18 | 苏州科技学院 | High-intensity focused ultrasonic transducer array |
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