多压电堆复合材料的小型化超声换能器

Howuk Kim, Huaiyu Wu, Leela D. Goel, Xiaoning Jiang
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引用次数: 2

摘要

本文旨在研制一种用于血管内溶栓的小型化超声换能器,该换能器要求具有高机械指数(> 0.3)和远焦距(> 2.0 mm)。为了满足这一需求,设计并制造了一种由PZT-4、导电环氧树脂、软弹性体和金属凹透镜组成的多柱压电堆叠(MPPS)复合传感器。仿真结果表明,在0.92 MHz左右是主要的扩展模式。与具有相同孔径的普通单柱压电堆叠(SPPS)换能器相比,−6 dB的焦距延长了150%。焦点区声压提高了8.2 dB。其次,实验结果显示,在120 Vpp输入下,峰负压为1.92 MPa,足以引起微泡造影剂的惯性空化。- 6 dB的焦距达到3.4 mm,与传统的SPPS传感器相比,这是一个显着的改进。所开发的血管内换能器将用于微泡介导的超声溶栓,以缩短治疗时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Miniaturized Ultrasound Transducer Composed of a Composite of Multiple Piezoelectric Stacks
This paper aims to develop a miniaturized ultrasound transducer for intravascular thrombolysis, which requires a transducer with high mechanical index (> 0.3) and a long focal distance (> 2.0 mm). To meet this need, a composite of a multi-pillar piezo stack (MPPS) transducer was designed and fabricated by using PZT-4, conductive epoxy, soft elastomer, and a metallic concave lens. The simulation results showed the predominant extensional mode at around 0.92 MHz. The −6 dB focal distance was elongated by 150% from that of the common single-pillar piezo stack (SPPS) transducer with the same aperture. The acoustic pressure was improved by 8.2 dB at the focal zone. Next, the experimental results showed the peak-to-negative pressure of 1.92 MPa under 120 Vpp input, which was sufficient to cause the inertial cavitation of microbubble contrast agents. The −6 dB focal distance reached up to 3.4 mm which was a significant improvement compared to the conventional SPPS transducer. The developed intravascular transducer will be employed for the microbubble-mediated ultrasound thrombolysis to reduce the treatment time.
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