腔内组织粉碎术用于高效组织消融——换能器设计与特性。

Endocavity Histotripsy for Efficient Tissue Ablation-Transducer Design and Characterization.

出版信息

IEEE Trans Ultrason Ferroelectr Freq Control. 2021 Sep;68(9):2896-2905. doi: 10.1109/TUFFC.2021.3055138. Epub 2021 Aug 27.

Abstract

A 34-mm aperture transducer was designed and tested for proof of concept to ablate tissues using an endocavity histotripsy device. Several materials and two drivers were modeled and tested to determine an effective piezoelectric-matching layer combination and driver design. The resulting transducer was fabricated using 1.5 MHz porous PZT and PerFORM 3-D printed acoustic lenses and was driven with a multicycle class-D amplifier. The lower frequency, compared to previously developed small form factor histotripsy transducers, was selected to allow for more efficient volume ablation of tissue. The transducer was characterized and tested by measuring pressure field maps in the axial and lateral planes and pressure output as a function of driving voltage. The axial and lateral full-width-half-maximums of the focus were found to be 6.1 and 1.1 mm, respectively. The transducer was estimated to generate 34.5-MPa peak negative focal pressure with a peak-to-peak driving voltage of 1345 V. Performance testing was done by ablating volumes of bovine liver tissues ( n = 3 ). The transducer was found to be capable of ablating tissues at its full working distance of 17 mm.

摘要

设计并测试了一种 34mm 孔径的换能器,用于腔内组织的证明概念验证,使用的是腔内组织粉碎装置。对几种材料和两个驱动器进行了建模和测试,以确定有效的压电匹配层组合和驱动器设计。该换能器使用 1.5MHz 多孔 PZT 和 PerFORM 3D 打印声透镜制造,并使用多周期 Class-D 放大器驱动。与之前开发的小尺寸因子组织粉碎换能器相比,选择较低的频率以允许更有效地消融组织。通过测量轴向和横向的压力场图以及作为驱动电压函数的压力输出,对换能器进行了特性和测试。焦点的轴向和横向半最大值分别为 6.1mm 和 1.1mm。该换能器估计在 1345V 的峰峰值驱动电压下可产生 34.5MPa 的峰值负压焦点压力。通过消融牛肝组织的体积(n=3)进行了性能测试。结果表明,该换能器能够在其 17mm 的全工作距离内消融组织。

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