超声手术刀振动特性分析

Vibration Analysis of Ultrasonic Scalpel

超声手术刀工作时的频率高达几万赫兹,即每秒振动几万次,容易产生疲劳损坏。介绍了超声手术刀的工作原理,并设计了一把工作频率在55.5k Hz左右的超声刀。然后,通过有限元分析软件ANSYS建模,对超声刀进行模态分析,得出它的固有频率和振型图,并进行谐响应分析,得到超声刀的振幅大小、应力应变参数以及谐响应曲线,研究超声手术刀在设计要求的谐振频率下的振动特性。通过有限元分析,超声刀在固有频率55053Hz下做纵向振动,在谐振频率55.5k Hz附近刀头振幅最大,刀头应力达到最大,刀身应力分布均匀。

Ultrasonic scalpel prone to fatigue damage, because it can come to tens of thousands vibrations per second when it is working. In this paper,the working principle of ultrasonic scalpel is introduced and an ultrasonic scalpel with a frequency of 55.5kHz is designed. Then, the ultrasonic scalpel with finite element analysis software ANSYS is ana-lyzed and the natural frequencies and modal shapes are obtained. The axial resonant frequency under the range of ultra-sonic excitation frequency is found by observing. The input terminal of ultrasonic scalpel is applied with displacement load. Harmonic response analysis is conducted to obtain the amplitude,stress distributions and harmonic response curves of ultrasonic scalpel. Then it can be used to analysis vibration characteristics of ultrasonic scalpel.