中文摘要：

以弹性波声导理论为基础,设计频率范围为50～60kHz的低频高能量＂纯＂纵向振动的球形刀头的超声手术刀.采用有限元方法优化刀头曲率半径R,对其进行模态分析和谐振分析,获取刀头输出位移、刀身应力分布等参数,使所设计的超声刀在50～60kHz频段内的振动模式为＂纯＂纵向振动,刀头纵向输出位移最大,刀身应力最小.为验证有限元分析结果,试制超声刀模型,进行超声刀振动模态和位移的实验测量.结果表明：通过优化超声刀刀头的曲率半径,可以实现超声刀＂纯＂纵向振动,且实验数据与仿真结果相一致,达到预期效果.

英文摘要：

An ultrasonic scalpel with spherical tip,which operates in the high power low-frequency range 50~60 kHz for biological tissue cutting and removal,is designed based on the theory of elastic wave guide.In order to make the scalpel operated in a ＂pure＂ longitudinal vibration mode and have the largest output displacement of the tip as well as the least stress distribution in the scalpel body,the design is optimized with finite element method（FEM）.According to the optimized design,the ultrasonic scalpel with spherical tip is produced and its output displacement of the spherical tip is measured with optical method.The experimental results are compared with FEM results.It shows that both are in agreement.