Title :
New discharge circuit using high voltage transmission line for efficient shock wave generation: application to lithotripsy
Author :
Broyer, P. ; Cathignol, D. ; Theillère, Y. ; Mestas, J.L.
fDate :
Oct. 31 1994-Nov. 3 1994
Abstract :
In extracorporeal shock wave lithotripsy (ESWL), spreading wave amplitude is limited by the inductance of the discharge circuit. The goal of this study is to demonstrate the possibility of increasing pressure wave amplitude by using a low inductance transmission line. A high voltage transmission line has been constructed using a ferroelectric ceramic with relative dielectric constant equal to 1700 to give a total capacitance of 100 nF. A coaxial spark gap, with minimal inductance, has been developed to obtain triggered breakdown of the charged line. This new discharge circuit generates a high voltage rectangular pulse between underwater electrodes and then creates a spreading wave. Pressure amplitude and electroacoustic efficiency compared to conventional generators results demonstrate qualities of this new generator
Keywords :
biomedical electronics; biomedical ultrasonics; coaxial cables; power transmission lines; pulse generators; radiation therapy; shock waves; spark gaps; 100 nF; capacitance; charged line; coaxial spark gap; dielectric constant; discharge circuit; efficient shock wave generation; electroacoustic efficiency; extracorporeal shock wave lithotripsy; ferroelectric ceramic; high voltage rectangular pulse; high voltage transmission line; inductance; lithotripsy; low inductance transmission line; pressure amplitude; pressure wave amplitude; spreading wave; spreading wave amplitude; triggered breakdown; underwater electrodes; Biomedical applications of acoustic radiation; Biomedical electrodes; Coaxial transmission lines; Power transmission lines; Pulse generation; Shock waves; Spark gaps;
Conference_Titel :
Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE
Conference_Location :
Cannes, France
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1994.401958
