Finite element static displacement optimization of 20-100 kHz flexural transducers for fully portable ultrasound applicator.
Finite element static displacement optimization of 20-100 kHz flexural transducers for fully portable ultrasound applicator.
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DOI：
10.1016/j.ultras.2012.09.005
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发表时间：
2013-02
期刊：
影响因子：
4.2
通讯作者：
Lewin, Peter A.
中科院分区：
文献类型：
--
作者：
Bawiec, Christopher R.;Sunny, Youhan;Nguyen, An T.;Samuels, Joshua A.;Weingarten, Michael S.;Zubkov, Leonid A.;Lewin, Peter A.
关键词：
本文重点介绍有限元模型的开发和随后的静态分析，以优化单个弯曲压电元件在20-100 kHz频率范围内的操作。这些元件形成了可行的、未拴系的和便携式超声施加器的基本构建块，该超声施加器可以产生具有最小（大约15 V）激励电压的大约100 mW/cm 2空间峰值时间峰值（ISPTP）的强度。超声施加器可以构造有不同数量的单独换能器元件和不同的几何形状，使得其覆盖区或有效面积是可调节的。这项研究背后的主要动机是开发一种无系绳、电池供电、完全便携式的超声施加器，用于治疗应用，如伤口愈合和无创透皮递送裸露和封装药物。它示出，仔细选择的组件确定施加器架构允许的位移振幅被最大化为一个特定的操作频率。这里描述的工作使用有限元分析软件COMSOL来识别允许施用器的设计被优化的几何形状和材料特性。通过最小化实现所需输出（100 mW/cm 2 ISPTP）所需的激励电压，可以减小电源（可充电锂聚合物电池）的尺寸，从而允许电子器件和超声施加器都适合可穿戴外壳。
This paper focuses on the development of a finite-element model and subsequent stationary analysis performed to optimize individual flexural piezoelectric elements for operation in the frequency range of 20–100 kHz. These elements form the basic building blocks of a viable, un-tethered, and portable ultrasound applicator that can produce intensities on the order of 100 mW/cm2 spatial-peak temporal-peak (ISPTP) with minimum (on the order of 15 V) excitation voltage. The ultrasound applicator can be constructed with different numbers of individual transducer elements and different geometries such that its footprint or active area is adjustable. The primary motivation behind this research was to develop a tether-free, battery operated, fully portable ultrasound applicator for therapeutic applications such as wound healing and non-invasive transdermal delivery of both naked and encapsulated drugs. It is shown that careful selection of the components determining applicator architecture allows the displacement amplitude to be maximized for a specific frequency of operation. The work described here used the finite-element analysis software COMSOL to identify the geometry and material properties that permit the applicator’s design to be optimized. By minimizing the excitation voltage required to achieve the desired output (100 mW/cm2 ISPTP) the power source (rechargeable Li-Polymer batteries) size may be reduced permitting both the electronics and ultrasound applicator to fit in a wearable housing.
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DOI：
10.7863/jum.2012.31.4.623
发表时间：
2012-04
期刊：
Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine
影响因子：
--
作者：
Miller DL;Smith NB;Bailey MR;Czarnota GJ;Hynynen K;Makin IR;Bioeffects Committee of the American Institute of Ultrasound in Medicine
通讯作者：
Bioeffects Committee of the American Institute of Ultrasound in Medicine
DOI：
10.1109/58.726463
发表时间：
1998-09-01
影响因子：
3.6
作者：
Tressler, JF;Cao, WW;Newnham, RE
通讯作者：
Newnham, RE
影响因子：
3.6
作者：
Ennis, William J.;Lee, Claudia;Meneses, Patricio
通讯作者：
Meneses, Patricio
影响因子：
3.6
作者：
Lai, Jengyu;Pittelkow, Mark R.
通讯作者：
Pittelkow, Mark R.
影响因子：
10.8
作者：
Lavon, Ilana;Grossman, Nili;Enden, Giora
通讯作者：
Enden, Giora