Based On Three Rows Of Multi-functional Composite Piezoelectric Material Probe Design

With the increasing of living standards, people are more attention to health andmedical equipment, as a representative， modern machinery industry also willdevelop quickly，the status of the medical device industry in economic developmenthas become more important. owing to strongly supported by the state，the medicaldevice industry has a good prospect. At present，about15%of the total medicaldevice were produced in the last century70’s.about60%were produced before themid-1980s. so upgrading is a very important problem.Ultrasound probe,as an important part of the medical device, the structural ofprobe will directly affect it’s performance. When the structure of probe is reasonable,then there is a good imaging; in contrary, the image is poor, it is difficult to find thecause, and even misdiagnosed condition. At the same time, the traditional probe onlycheck function, structure and purpose are both simple, does not have the therapeuticfunction, it has no specific destination in the drug transport process, the efficacy of thedrug reduce. greatlyAiming at the problem of structure and function of the ultrasound probe issimple, according to characteristic of ultrasonic and theory of controlling particle inultrasonic field, we developed a dual-band and multi-purpose ultrasound probe whichhas t the new structure with three rows, the new probe the side array with lowfrequency and the middle array with high frequency imaging are integrated in probe.,so that "ultrasound imaging" and "ultrasound radiation force" can run in parallel,ultrasound imaging and controlling in three-dimensional of ultrasound radiation forcewill come true at the same time. achieve the applications that controlling inthree-dimensional is guided by real-time ultrasound image-radiation. Successfullydeveloping three-row probe with dual frequency ultrasound will really play as a instrument in drug transport potential, expanding from the traditional imaging totherapeutic field, and achieve Multifunctional Medical Ultrasound Technology of"Imaging-administration-Treatment integration". The main thesis of this paper isdesign three-row probe of multi-functional which based on composite piezoelectricmaterial. It will provide new ideas for researching and developing high-end of theprobe, and lay the foundation for industrialization. Paper has made the followingknowledge and achievements:(1) Analyzing the feature of ultrasonic transducer in sound field, analyzingcharacteristics of the plane circular piston transducer, flat rectangular transducer andconcave spherical focused transducer in sound field, as well as their distribution ofsound pressure, and then making a acoustic o simulation for a ring of transducers andfigure out their characteristics and the relevant parameters(2)Exploring movement of particles in different waveforms，analyzing particlemovement from standing and traveling wave through mechanical equations of particlemotion and different application generated by different impact for standing waves andtravelling wave and its trajectory. At the same time, analyzing energy distributionwhich is the generated by the ultrasound transducer and the controlling of particle.Explore how to achieve the different forms of controlling for the particles usingdifferent forms of the transducer and achieve sound field superposition by using aplurality of transducers at the same time, then manipulate the particles or bubbles inthree-dimensional space will realize.(3) According to the Technical requirements of image forming-multifunctionalhis medical-ultrasonic treatment and the theory of controlling particle in sound field,a probe of three-row configuration is designed, we have designed it’s structure, shape,size, their connections-administration and the spatial position of transducer distributein the probe. To make three-row transducer more perfect， so we make someprecise fixtures. The parameters of Three-rows probe is that: the left and rightexhaust probe-1.5D、 effective height-6mm、 center frequency-1.5MHz、 arrayelement-64、distance of array element center-0.6mm、pulse echo--6dB、 bandwidthpercentage-50%; the middle probe:1D linear array、effective height-4mm、centerfrequency-5.3MHz、number of array element-128; distance of array element center-0.30mm、pulse echo--6dB、percentage Bandwidth-75%; axial focus Depth-35mm；Spatial position: the middle transducer was flat, the left and right transducersrespectively, and the intermediate plane of the transducer is angled about8.75degreesplaced in the middle of the sides of the transducer so that their focal length is35mm. (4) work out the process of the probe according to the design of the three-rowprobes, the piezoelectric ceramic grinding-grooving ceramic-ceramic injectionmolding-Polished ceramic-ceramic cutting picket-spray Mercury-Weldingflexible circuit boards-Preparation backing acoustic lens, matching layer-adhesivemember-welding cables.(5) Explore the problems which appear in the bonding process, the weldingprocess, the cutting process and cutting process, and come up with some ways tosolve these problems.