News and Events


2013 年 10 月 08 日
Seminar - Development and Performance Evaluation of Electromagnetictype Shock Wave Generator for Lipolysis by Dr. Shen-Min Liang

Date:   08 October 2013 (Tuesday)

Time:   11:00 am – 12:00 pm

Venue:  EF305, The Hong Kong Polytechnic University


This study aims at the design and development of electromagnetic-type intermittent shock wave generation in a liquid. The shock wave generated is focused at a focal point through an acoustic lens. This hardware device mainly consists of a full-wave bridge rectifier, 6 capacitors, a spark gap and a flat coil. A metal disk is mounted in a liquid-filled tube and is placed in close proximity to the flat coil. Due to the repulsive force existing between the coil and disk shock waves are generated while an eddy current is induced in the metal disk. Some components and materials associated with the device are also described. By increasing the capacitance content to enhance electric energy level, a highly focused pressure can be achieved at the focal point through an acoustic lens in order to lyse fat tissue. Focused pressures were measured at the focal point and its vicinity for different operation voltages. The designed shock wave generator with an energy intensity of 0.0016mJ/mm2 (at 4kV) and 2000 firings or higher energy intensities with 1000 firings is found to be able to rupture pig fat tissue.


Dr. Shen-Min Liang received his B.S. in Applied Math at National Chung-Hsing University in 1973, M.S. in Math at Carleton University in 1978 and Ph. D. in Applied Math at University of Arizona in 1985. He became an Associate Professor and professor of Dept. of Aero & Astro. at National Cheng Kung University in 1985 and 1992. He is currently Professor of the Department of Computer Application Engineering at Far East University. Dr. Liang has research experiences in CFD researches, Medical applications of extracorporeal shock waves and Acoustic researches of flows with blast waves.