CN205006923U - Blood vessel ultrasonic focus diagnostic equipment and focus transducer - Google Patents
Blood vessel ultrasonic focus diagnostic equipment and focus transducer Download PDFInfo
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- CN205006923U CN205006923U CN201520682024.XU CN201520682024U CN205006923U CN 205006923 U CN205006923 U CN 205006923U CN 201520682024 U CN201520682024 U CN 201520682024U CN 205006923 U CN205006923 U CN 205006923U
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Abstract
The utility model discloses a blood vessel ultrasonic focus diagnostic equipment and focus transducer, this blood vessel ultrasonic focus diagnostic equipment includes ultrasound catheter, withdrawing drive arrangement and electronic imaging system, vascular ultrasonic focus transducer is installed to ultrasound catheter's front end, the rear end links to each other with withdrawing drive arrangement, withdrawing drive arrangement links to each other with electronic imaging system. This blood vessel ultrasonic focus transducer includes ultrasound energy transducing unit and focus unit, and the ultrasound energy transducing unit is used for launching the supersound signal to supersound signal to reflecting is back received, and the focus unit is used for focusing on the supersound signal of ultrasound energy transducing unit transmission. The utility model discloses a focus of blood vessel ultrasonic is technological, has improved the resolution ratio of diagnostic equipment, has improved the SNR of diagnostic equipment formation of image simultaneously to improve the diagnosis accuracy.
Description
Technical field
This utility model relates to intravascular ultrasound diagnostic apparatus, particularly a kind of intravascular ultrasound focused diagnostic instrument and focused transducer.
Background technology
Intravascular ultrasound diagnostic apparatus is the most effective diagnostic ultrasonic equipment of the congestion situations in order to diagnosis of cardiovascular or external perihaemal canal; To be known as " goldstandard " of congestion situations of analyzing cardiovascular or external perihaemal canal.It can detect the distance and position and range size etc. that block cross section quantitatively.Due to vascular wall by blood vessel wall from tube chamber towards be made up of inner membrance (tunicaintima), middle film (tunicamedia) and adventitia (tunicaadventitia) successively, intravascular ultrasound diagnostic apparatus can also be used to analyze the pathological changes situation of vascular wall.
Vessel diameter only millimeter to centimetre scope.In order to analyze the pathological changes of blood vessel blockage and tube wall, need high-resolution intravascular ultrasound diagnostic apparatus.The operating frequency of current intravascular ultrasound diagnostic apparatus is at 40MHz, and its vertical and horizontal resolution is approximately respectively at 100 microns and 400 microns.Improve the operating frequency of instrument, the resolution of detection can be improved, but, also can reduce the detection range (distance) of instrument simultaneously and increase because endovascular environment is to the scattering of signal, causing the detection signal-to-noise ratio lowering instrument.
Utility model content
This utility model is for above-mentioned problems of the prior art, a kind of intravascular ultrasound focused diagnostic instrument and focused transducer are proposed, utilize focus ultrasonic technology, significantly improving the resolution of vascular diagnostic instrument, solving in prior art to improve the problem that resolution makes detection signal-to-noise ratio reduce.
For solving the problems of the technologies described above, this utility model is achieved by the following technical solution:
This utility model provides a kind of intravascular ultrasound focused diagnostic instrument, and it comprises: ultrasound catheter, withdraw/driving device and electronic imaging system.The front end of described ultrasound catheter is provided with intravascular ultrasound focused transducer, withdraws/driving device described in rear end connects; Describedly to withdraw/the driving device other end connects described electronic imaging system, described electronic imaging system is mounted with the electronic unit rebuilding image, the aperture of described intravascular ultrasound focused transducer is 0.3mm ~ 2mm, it focuses on the ultrasonic signal launched, reduce the sensing angle factor of ultrasonic signal, and reduce scattering volume.
Intravascular ultrasound focused transducer of the present utility model is miniature ultrasonic sensor, can intravasation inner, internal blood vessel pathological changes is detected.Describedly to withdraw/ultrasound catheter first delivered to target lesion position far-end through seal wire by driving device, then slowly withdraw ultrasound catheter and carry out ultrasonic examination, just can see a series of vessel cross-section image on the display screen of electronic imaging system, assist clinicians is diagnosed vessel inner lesion.
The design of intravascular ultrasound catheter conventional at present mainly contains two kinds: machinery rotating type and electronically phased array formula.Machinery rotating type is the rotation of transducer within the scope of 360 degree by single array element, and launch ultrasound wave, the sound collecting be simultaneously reflected back by vascular cross-section, passes through image procossing, obtain vessel cross-sections image, now withdraw device and will have the function driving transducer to rotate concurrently.The cylindrical arrangement of transducer of electronically phased array formula, without the need to rotating, utilizing the method that electronic delay encourages, the sound collecting be reflected back by vascular cross-section, obtaining vessel cross-sections image after image procossing.
Design corresponding transducer have two kinds with these two kinds, be respectively: the planar transducer (as shown in Figure 1) of (1) simple beam; (2) transducer (as shown in Figure 2) of cylindrical array.
The planar transducer of simple beam is usually by back lining materials, and piezoelectric and matching layer composition, back lining materials, piezoelectric and matching layer can be that only one or more layers is composited, to obtain required performance requirement.The transducer of cylindrical array is the cylindric transducer array composition be composed of multiple units, and the center of cylindric transducer is back lining materials and suitable electronic device, and the unit of strip is distributed on the face of cylinder by certain acoustical demands.
The function that the wave beam of these two kinds of transducers existing does not all focus on the direction of detection.Sound wave only has the natural separating surface in a near field and far field on the direction of propagation of detection.Therefore, the lateral resolution of image depends on the natural bandwidth of wave beam, and do not have the natural broader bandwidth of the wave beam focused on, its resolution is lower.The sound wave of ultrasonic focusing energy transducer of the present utility model is focused sound waves, natural zone width, and therefore, its resolution is high, namely improves the resolution of vascular diagnostic instrument.
The sound intensity that medical ultrasound detects is defined as the acoustic energy in unit are, namely equals the ratio of total energy W and beam area:
Obviously, for given acoustical power, reduce beam area S, just can increase sound intensity I, thus improve the signal to noise ratio of image checking.
For given Space Angle d Ω, ultrasonic scattering sound intensity is
to the volume integral in space.Wherein Sv is volume scattering coefficient.Dv is scattering volume unit, is defined as
wherein: r is ultrasonic transducer range-to-go, and c is the velocity of sound, and τ is pulse length;
with
be respectively the sensing angle factor of transmitting and receiving, its principle as shown in Figure 3.
Be not difficult to find out, reduce to point to angle factor
with
to directly improve the resolution of image checking.The method of existing raising intravascular ultrasound detection resolution, for the operating frequency by improving instrument realizes.The operating frequency improving instrument reduces sensing angle factor
with
but with the rising of operating frequency, volume scattering coefficient S v exponent function relation increases, the endovascular environment of increase to the scattering of signal, causes the detection signal-to-noise ratio of instrument to reduce, thus reduces the investigative range of instrument by this.
Ultrasonic focusing energy transducer of the present utility model not only reduces sensing angle factor
with
improve the resolution of image checking; Also reduce scattering volume dv simultaneously, reduce the scattering strength of Ink vessel transfusing environment (platelet etc.), thus improve the signal to noise ratio (signal dispersion noise ratio) of image checking, improve the definition of imaging, the i.e. quality of image, also improves the investigative range of diagnostic apparatus simultaneously.
The realization of this utility model focus supersonic technology can be divided into by the method realized: (1) frame for movement focuses on; (2) electron focusing.Frame for movement focuses on and whole acoustic structure can be divided into again to focus on and sound lens focusing.Preferably, described ultrasonic focusing energy transducer comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; Wherein: described backing layer, described piezoelectric layer and described acoustic matching layer all have required mechanical curved surface, then superpose, be bonded together, be achieved sound beam focusing, it adopts whole acoustic structure focusing technology to realize focusing on.
Preferably, described intravascular ultrasound focused transducer is Ink vessel transfusing high-frequency transducer, and its implementation is by reducing the piezoelectric layer of transducer and the thickness of matching layer.
Preferably, described intravascular ultrasound focused transducer comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; Wherein: described backing layer and/or described piezoelectric layer and/or described acoustic matching layer have mechanical curved surface, the radius of curvature of described mechanical curved surface is determined according to predetermined focal distance f, (ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: the size of K=f/d, aperture d can be determined according to predetermined (ionospheric) focussing factor K and focal distance f.
Preferably, described ultrasonic focusing energy transducer comprises close-connected backing layer, piezoelectric layer, acoustic matching layer and acoustic lens successively; Wherein: described acoustic lens has mechanical curved surface, its radius of curvature is determined according to predetermined focal distance f, and (ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: K=f/d, and the size of aperture d can be determined according to predetermined (ionospheric) focussing factor K and focal distance f.
Preferably, described acoustic lens is plano-convex or plano-concave acoustic lens, and the concaveconvex shape of lens is determined by the velocity of sound of acoustic lens.
Preferably, described ultrasonic focusing energy transducer comprises multiple ultrasonic transduction unit and multiple delay circuit; Wherein: each described ultrasonic transduction unit accesses a described delay circuit, carry out compensation sound wave from launch point to the time difference caused by the path difference of individual ultrasonic focusing energy transducer, path difference and time difference are determined according to predetermined centre-to-centre spacing deviation; I-th ultrasonic transduction unit is D to the distance of central axis
i, by centre-to-centre spacing deviation D
ithe path difference introduced is:
time difference T
ifor:
wherein: i=1,2 ..., 5, f is focal length, and c is the velocity of sound.This ultrasonic focusing energy transducer, can the focal length of free adjustment system by regulating time of delay circuit, and more flexibly, it adopts electron focusing technology to realize focusing on.
Preferably, described multiple ultrasonic transduction unit is arrange with one heart or array arrangement.
Preferably, when described multiple ultrasonic transduction unit is arranged with one heart, it is donut arrangement or Fang Huan arrangement with one heart.
Preferably, the material that described piezoelectric layer uses can be piezoceramic material, piezoelectric thick material, piezoelectric film material, piezo-electric ceramic composite material or piezoelectric monocrystalline composite material.
Preferably, when the material of described piezoelectric layer is piezoelectric monocrystalline composite material, it is PMN-PT piezoelectric monocrystalline composite material or PIN-PMN-PT piezoelectric monocrystalline composite material.PMN-PT and PIN-PMN-PT has very high k33 (can up to more than 0.9), and therefore the composite transducers of PMN-PT and PIN-PMN-PT has very high sensitivity and bandwidth.
Preferably, described intravascular ultrasound focused transducer is piezoelectric micromotor processing ultrasonic focusing energy transducer (PMUT) or electric capacity micro-machined ultrasonic focused transducer (CMUT).
This utility model also provides a kind of intravascular ultrasound focused transducer, and it comprises: ultrasonic transduction unit and focusing unit; Wherein: described ultrasonic transduction unit for launching a ultrasonic signal, and receives the ultrasonic signal reflected; Described ultrasonic transduction unit comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; The ultrasonic signal that focusing unit is used for described ultrasonic transduction unit is launched focuses on.
It should be noted that, herein said focusing unit be decided to be a concrete structure, can be that ultrasonic transduction unit self structure is changed, make it have focusing function.The focusing technology that intravascular ultrasound focused transducer of the present utility model adopts specifically can be divided into two large classes: (1) frame for movement focuses on; (2) electron focusing.Frame for movement focuses on and whole acoustic structure can be divided into again to focus on and sound lens focusing.
Preferably, described focusing unit is specially the mechanical curved surface formed on described backing layer, described piezoelectric layer and described acoustic matching layer, and it is the intravascular ultrasound focused transducer adopting whole acoustic structure focusing technology.
Preferably, described focusing unit is specially the acoustic lens with mechanical curved surface, the acoustic matching layer compact siro spinning technology of described acoustic lens and described ultrasonic transduction unit, described acoustic lens is positioned at the side of described matching layer back to described piezoelectric layer, it is for adopting the intravascular ultrasound focused transducer of sound lens focusing technology.
Preferably, described ultrasonic transduction unit comprises multiple; Described focusing unit is specially multiple delay circuit, and each described ultrasonic transduction unit connects a described delay circuit, and it is the intravascular ultrasound focused transducer adopting electron focusing technology.
Compared to prior art, this utility model has the following advantages:
(1) the intravascular ultrasound focused diagnostic instrument that provides of this utility model and focused transducer, utilize focus ultrasonic technology, the sound intensity of ultrasound detection can be strengthened, and signal to noise ratio and the resolution of the imaging of intravascular ultrasound diagnostic apparatus can be significantly improved, namely utilize focus ultrasonic technology can under the prerequisite not increasing ultrasound detection beam angle, improve the vertical and horizontal resolution that instrument detects simultaneously, namely improve and be detected as the quality of picture and the definition of detection, thus improve the degree of accuracy of diagnosis;
(2) the intravascular ultrasound focused diagnostic instrument that provides of this utility model and focused transducer, reduce the aperture of transducer, intravascular ultrasound focused diagnostic instrument can be made to get involved in more tiny blood vessel (such as cerebrovascular) and to implement ultra sonic imaging and checkout and diagnosis, range of activity is larger in the blood vessel to make it, convenient rotates freely, and decreases the friction with blood vessel wall;
(3) conventional at present medical ultrasonic transducer, the thickness of its piezoelectric layer is 1/2 wavelength of operating frequency, and matching layer thickness is 1/4 wavelength of operating frequency, is namely respectively Cc/2f and Cm/4f.Wherein Cc, Cm be piezoelectric with the velocity of sound (m/s) of matching layer, f is operating frequency (Hz), and this utility model, by reducing the thickness of piezoelectric layer and matching layer, improves operating frequency, thus improves image checking resolution; Although improve operating frequency scattering can be increased, turn reduce scattering by focusing.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
Fig. 1 is the schematic diagram of existing simple beam planar transducer;
Fig. 2 is the schematic diagram of existing cylindrical array transducer;
Fig. 3 is the volume scattering coefficient of ultrasonic transducer and the schematic diagram of diffuse sound intensity;
Fig. 4 is the schematic diagram of the intravascular ultrasound focused transducer of embodiment 1 of the present utility model;
Fig. 5 is the schematic diagram of the intravascular ultrasound focused transducer of embodiment 2 of the present utility model;
Fig. 6 is the schematic diagram of the intravascular ultrasound focused transducer of embodiment 3 of the present utility model;
Fig. 7 is the intravascular ultrasound focused transducer of embodiment 3 of the present utility model is the left view that donut is arranged;
Fig. 8 is the intravascular ultrasound focused transducer of embodiment 3 of the present utility model is the left view that concentric Fang Huan arranges;
Fig. 9 is the intravascular ultrasound focused transducer of embodiment 3 of the present utility model is the left view of array arrangement;
Figure 10 is the schematic diagram of intravascular ultrasound focused diagnostic instrument of the present utility model.
Label declaration: 1-ultrasound catheter, 2-withdraws/driving device, 3-electronic imaging system; 11-backing layer, 12-piezoelectric layer, 13-acoustic matching layer, 14-lens.
Detailed description of the invention
Below embodiment of the present utility model is elaborated; the present embodiment is implemented under premised on technical solutions of the utility model; give detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
Ultrasonic focusing energy transducer of the present utility model comprises: ultrasonic transduction unit and focusing unit; Wherein: described ultrasonic transduction unit is used for ultrasonic transmitting and receiving; Described ultrasonic transduction unit comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; Focusing unit is used for ultrasonicly focusing on described.Ultrasonic focusing energy transducer of the present utility model is described in detail below in conjunction with specific embodiment.
Embodiment 1: the intravascular ultrasound focused transducer adopting whole acoustic structure focusing technology
Be illustrated in figure 4 the schematic diagram of the ultrasonic focusing energy transducer of the present embodiment, it comprises close-connected backing layer 11, piezoelectric layer 12 and acoustic matching layer 13 successively, wherein: backing layer 11, piezoelectric layer 12 and acoustic matching layer 13 all have mechanical curved surface, the radius of curvature of three can calculate according to the requirement of focusing acoustic field and set.(ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: K=f/d.After given (ionospheric) focussing factor K and focal distance f, just can calculate the size of aperture d.
Embodiment 2: the intravascular ultrasound focused transducer adopting sound lens focusing technology
Be illustrated in figure 5 the schematic diagram of the ultrasonic focusing energy transducer of the present embodiment, it comprises close-connected backing layer 11, piezoelectric layer 12, acoustic matching layer 13 and acoustic lens 14 successively, wherein, acoustic lens 4 has mechanical curved surface, and its radius of curvature can calculate according to the requirement of focusing acoustic field and set.
Acoustic lens 14 can be planoconvex lens or planoconcave lens, and it determines according to the velocity of sound of lens material.For the lens material of the velocity of sound lower than the medium velocity of sound, be planoconvex lens, as shown in phantom in Figure 5; For the lens material of the velocity of sound higher than the medium velocity of sound, be planoconcave lens, as shown in solid line in Fig. 5.
Embodiment 3: the intravascular ultrasound focused transducer adopting electron focusing technology
Be illustrated in figure 6 the schematic diagram of the ultrasonic focusing energy transducer of the present embodiment, it comprises multiple ultrasonic transduction unit and multiple delay circuit T, the corresponding delay circuit T of each ultrasonic transduction unit,
The present embodiment is for five concentric side's ring transducing unit, and its left view as shown in Figure 7, is denoted as e1 ... e5, the time that sound wave F point from free found field arrives each ultrasonic transduction unit is different.Therefore, total Received signal strength is the superposition of the signal of out of phase, and output signal can not be maximum.Output termination delay circuit of each ultrasonic transduction unit, carrys out compensation sound wave from F point to the time difference caused by the path difference of each ultrasonic transduction unit.I-th ultrasonic transduction unit is D to the distance of central axis
i, then by centre-to-centre spacing deviation D
ithe path difference introduced is:
Time difference T
ifor:
In formula, i=1,2 ..., 5, f is focal length, and c is the velocity of sound.As given D
i, by regulating the time difference T of delay circuit
i, can focus f, reaches variable focal length focus ultrasonic.
In different embodiment, multiple ultrasonic transduction unit also can be that concentric Fang Huan arranges, and its left view as shown in Figure 8; Also can be array arrangement, its left view as shown in Figure 9.In above-described embodiment, the material of piezoelectric layer 12 can be piezoceramic material, piezoelectric thick material, piezoelectric film material, piezo-electric ceramic composite material or piezoelectric monocrystalline composite material; Intravascular ultrasound focused transducer can be PMUT or CMUT.
Embodiment 4: intravascular ultrasound focused diagnostic instrument
As shown in Figure 10, for the structural representation of focus ultrasonic vascular diagnostic instrument of the present utility model, it comprises ultrasound catheter 1, withdraw/driving device 2 and electronic imaging system 3, the front end of ultrasound catheter 1 is provided with ultrasonic focusing energy transducer, rear end connection withdraws/driving device 2, withdraw/driving device 2 is connected with electronic imaging system 3, the electronic unit rebuilding image is mounted with in electronic imaging system 3, rebuild the image of Ink vessel transfusing transverse section according to the ultrasonic signal received, thus judge vessel inner lesion according to image.Wherein: the ultrasonic focusing energy transducer of ultrasonic focusing energy transducer described by any one in such as embodiment 1-3, the aperture of ultrasonic focusing energy transducer is millimeter magnitude herein, preferably between 0.3mm ~ 2mm, and can intravasation diseased region.
Ultrasonic focusing energy transducer is utilized to not only reduce sensing angle factor
with
also reduce scattering volume dv simultaneously, thus improve the resolution of image checking, and reduce the scattering strength of Ink vessel transfusing environment, improve the signal to noise ratio of image checking, improve the definition of imaging, also improve the investigative range of diagnostic apparatus simultaneously.
Disclosed herein is only preferred embodiment of the present utility model, and this description is chosen and specifically described these embodiments, and being to explain principle of the present utility model and practical application better, is not to restriction of the present utility model.The modifications and variations that any those skilled in the art do within the scope of description, all should drop in scope that this utility model protects.
Claims (15)
1. an intravascular ultrasound focused diagnostic instrument, is characterized in that, comprising:
Ultrasound catheter, the front end of described ultrasound catheter is provided with intravascular ultrasound focused transducer, and the aperture of described intravascular ultrasound focused transducer is 0.3mm ~ 2mm, and it focuses on the ultrasonic signal launched, reduce the sensing angle factor of ultrasonic signal, and reduce scattering volume;
Withdraw/driving device, and
Electronic imaging system, it is mounted with the electronic unit rebuilding image; Wherein:
The rear end of described ultrasound catheter withdraws with described/and driving device is connected; Describedly to withdraw/driving device is connected with described electronic imaging system.
2. intravascular ultrasound focused diagnostic instrument according to claim 1, is characterized in that, described intravascular ultrasound focused transducer is Ink vessel transfusing high-frequency transducer.
3. intravascular ultrasound focused diagnostic instrument according to claim 1, is characterized in that, described intravascular ultrasound focused transducer comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively; Wherein:
Described backing layer and/or described piezoelectric layer and/or described acoustic matching layer have mechanical curved surface, the radius of curvature of described mechanical curved surface is determined according to predetermined focal distance f, (ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: the size of K=f/d, aperture d can be determined according to predetermined (ionospheric) focussing factor K and focal distance f.
4. intravascular ultrasound focused diagnostic instrument according to claim 1, is characterized in that, described intravascular ultrasound focused transducer comprises close-connected backing layer, piezoelectric layer, acoustic matching layer and acoustic lens successively; Wherein:
Described acoustic lens has mechanical curved surface, and its radius of curvature is determined according to predetermined focal distance f, and (ionospheric) focussing factor K is defined as the ratio of focal distance f and transducer aperture d, that is: K=f/d, and the size of aperture d can be determined according to predetermined (ionospheric) focussing factor K and focal distance f.
5. intravascular ultrasound focused diagnostic instrument according to claim 4, is characterized in that, described acoustic lens is plano-convex or plano-concave acoustic lens.
6. intravascular ultrasound focused diagnostic instrument according to claim 1, is characterized in that, described intravascular ultrasound focused transducer comprises multiple ultrasonic transduction unit and multiple delay circuit; Wherein:
Each described ultrasonic transduction unit connects a described delay circuit, and in order to compensation sound wave from focus to the time difference caused by the path difference of each ultrasonic transduction unit, path difference and time difference are determined according to predetermined centre-to-centre spacing deviation; I-th ultrasonic transduction unit is D to the distance of central axis
i, by centre-to-centre spacing deviation D
ithe path difference introduced is:
time difference T
ifor:
wherein: i=1,2 ..., 5, f is focal length, and c is the velocity of sound.
7. intravascular ultrasound focused diagnostic instrument according to claim 6, is characterized in that, described multiple ultrasonic transduction unit is arrange with one heart or array arrangement.
8. intravascular ultrasound focused diagnostic instrument according to claim 7, is characterized in that, when described multiple ultrasonic transduction unit is arranged with one heart, it is donut arrangement or Fang Huan arrangement with one heart.
9. intravascular ultrasound focused diagnostic instrument according to claim 1, it is characterized in that, the material of the piezoelectric layer of described intravascular ultrasound focused transducer is any one in piezoceramic material, piezoelectric thick material, piezoelectric film material, piezo-electric ceramic composite material, piezoelectric monocrystalline composite material.
10. intravascular ultrasound focused diagnostic instrument according to claim 9, is characterized in that, when the material of described piezoelectric layer is piezoelectric monocrystalline composite material, it is PMN-PT piezoelectric monocrystalline composite material or PIN-PMN-PT piezoelectric monocrystalline composite material.
11. intravascular ultrasound focused diagnostic instrument according to claim 9, is characterized in that, described intravascular ultrasound focused transducer is piezoelectric micromotor processing ultrasonic focusing energy transducer or electric capacity micro-machined ultrasonic focused transducer.
12. 1 kinds of intravascular ultrasound focused transducers, is characterized in that, comprising: ultrasonic transduction unit and focusing unit; Wherein:
Described ultrasonic transduction unit for launching a ultrasonic signal, and receives the ultrasonic signal reflected; Described ultrasonic transduction unit comprises close-connected backing layer, piezoelectric layer and acoustic matching layer successively;
The ultrasonic signal that focusing unit is used for described ultrasonic transduction unit is launched focuses on.
13. intravascular ultrasound focused transducers according to claim 12, is characterized in that, described focusing unit is specially the mechanical curved surface formed on described backing layer, described piezoelectric layer and described acoustic matching layer.
14. intravascular ultrasound focused transducers according to claim 12, it is characterized in that, described focusing unit is specially the acoustic lens with mechanical curved surface, the acoustic matching layer compact siro spinning technology of described acoustic lens and described ultrasonic transduction unit.
15. intravascular ultrasound focused transducers according to claim 12, is characterized in that, described ultrasonic transduction unit comprises multiple;
Described focusing unit is specially multiple delay circuit, and each described ultrasonic transduction unit connects a described delay circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105105791A (en) * | 2015-09-02 | 2015-12-02 | 上海爱声生物医疗科技有限公司 | Intravascular ultrasonic focusing method, focusing diagnostic device and focusing energy transducer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105105791A (en) * | 2015-09-02 | 2015-12-02 | 上海爱声生物医疗科技有限公司 | Intravascular ultrasonic focusing method, focusing diagnostic device and focusing energy transducer |
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