一种超声手术刀推挽激励换能器的研究

A study of push-pull excitation transducer for ultrasonic scalpel

设计了一种超声手术刀用的新型推挽激励换能器。它是在夹心式单晶堆压电超声换能器的经典构造基础上,把原先激励一组压电陶瓷晶片堆的方式,改为同时施加反相激励的前后两组晶堆。利用有限元方法,对该推挽激励换能器进行模态分析和频率响应分析。在相同大小的电压激励下,相对单晶堆换能器,推挽激励换能器可以获得更高的工作带宽和机电耦合系数,提高了换能器的电声转换效率。按照仿真结果加工推挽激励换能器,实现良好的动力学和电学特性,满足设计要求。

This paper designed a new type of push-pull excitation transducer for the need of ultrasonic surgical knife. Based on the classical structure of the sandwich typed single piezoelectric ceramic stack ultrasonic transducer, the way of meantime exciting two piezoelectric ceramic stacks in inverse phases is adopted to replace the original way of excit- ing only one piezoelectric ceramic stack. By using the finite element method, the modal analysis and harmonic response analysis of the push-pull excitation transducer has been done in this paper. Under the same voltage excitation, compared to the single stack transducer, the push-pull excitation transducer can obtain higher frequency bandwidth and electromechanical coupling coefficient, and so improve the electroacoustic conversion efficiency of the transducer. According to the results of simulation to process the push-pull excitation transducer, good dynamic and electrical characteristics of the transducer, which meet the design requirements, are achieved.