ELECTRONIC BEAM-STEERING OF SHOCK-WAVES

被引:14
作者
CATHIGNOL, D
BIRER, A
NACHEF, S
CHAPELON, JY
机构
[1] INSERM U 281, Lyon
关键词
SHOCK WAVES; LITHOTRIPSY; BEAM STEERING; ULTRASOUND THERAPY; HIGH INTENSITY FOCUSED ULTRASOUND; RENAL STONES;
D O I
10.1016/0301-5629(94)00115-T
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Shock-wave generators are now currently used for the treatment of renal stones. In all these generators the focal zone is determined by their geometrical parameters. We propose, for the first time, a piezocomposite shock-wave generator with electronic focusing. The system is composed of a two-dimensional array and its electronic hardware. The array is composed of 121 independent piezocomposite transducers arranged in a spherical shell 20 cm in diameter and focused at 190 mm, The electronic hardware includes 121 X 6 kV-impulse generators. The interdelay of each channel can be adjusted between 10 ns to 100 mu s by steps of 10 ns. The results show: the use of composite material is possible for the generation of high amplitude pressure waves; the pressure-voltage relationship is linear up to a pressure of about 28 x 10(5) Pa at the transducer front face; the material can be used for a long period of time; i.e,, after one million shocks, no decrease in sensitivity, no alteration in its electrical behaviour and no time wave form distortion were observed. Electronic focusing is efficient in an ellipsoidal region of about 4 cm in diameter and 6 cm in length. The pressure in the focal zone is about 600 X 10(5) Pa.
引用
收藏
页码:365 / 377
页数:13
相关论文
共 30 条
[11]  
ISHIDA A, 1989, Patent No. 0336620
[12]  
ISHIDA A, 1991, Patent No. 0461479
[13]   DESIGN OF SLOTTED TRANSDUCER ARRAYS WITH MATCHED BACKINGS [J].
KINO, GS ;
DESILETS, CS .
ULTRASONIC IMAGING, 1979, 1 (03) :189-209
[14]   PRESSURE SENSORS FOR CONTROLLING ELECTROHYDRAULIC SHOCK-WAVE GENERATORS [J].
MESTAS, JL ;
CATHIGNOL, D .
JOURNAL DE PHYSIQUE, 1990, 51 (C2) :1287-1290
[15]  
NACHEF S, 1992, EUROPEAN CONFERENCE ON UNDERWATER ACOUSTICS, P652
[16]  
NACHEF S, 1992, THESIS I NATIONAL SC
[17]   THEORY OF FOCUSING RADIATORS [J].
ONEIL, HT .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1949, 21 (05) :516-526
[18]  
PRADA C, 1991, THESIS U PARIS 7
[19]  
PRADA C, 1993, IEEE ULTRASONIC S BA, V2, P1139
[20]  
RENAUD P, 1985, R B M, V7, P369