用于体内碎石的超声振动系统设计

Ultrasound Vibration System Designed for in Vivo Breaking Stones

针对常见的超声振动系统难以满足体内碎石对小体积和大振幅的要求,对小体积实现大振幅的超声振动系统的设计原理和方法进行研究。根据任意截面杆的波动方程,得到单一截面杆的位移方程和应力方程,并通过振动系统的边界条件,推导出超声振动系统的频率方程。根据推导出的频率方程,设计出用于碎石的超声振动系统,对所设计的超声振动系统振动性能进行有限元分析和试验测试,分析和试验结果表明,振动系统谐振频率的设计结果和有限元分析及测试结果的误差均在3%以内,测得碎石振动系统的振幅为25μm。

As common ultrasonic vibration system cannot meet the requirements of small size and large amplitude in vivo breaking stones,the design principle and method of ultrasonic vibration system with large amplitude and small volume were studied.Meanwhile,the displacement equation and stress equation of single-section rod were received through the wave equation of arbitrary cross-section rod.The frequency equation of ultrasonic vibration system was deduced by the boundary conditions of vibration system.The ultrasonic vibration system for gravel was designed by the deduced frequency equation.The performances of the frequency of vibration system were obtained by FEM analysis and test.The results showed that the error of the designed frequency of vibration system was less than 3%,compared with the results obtained by FEM analysis and test.The maximum amplitude of the vibration system was 25μm.