Extracorporeal shock wave source with a piezoelectric generator

Details Extracorporeal shock wave source with a piezoelectric generator Extracorporeal shock wave source with a piezoelectric generator

1987-04-01

1989-04-25

Smith, Ruth S.

Surgery

Truss

Perineal

128328, A61B 1722

Patent

active

048237736

ABSTRACT:
An extracorporeal lithotripter with a piezoceramic pressure source which emits focused pressure waves focussed at a point within a patient at which a calculus to be disintegrated is located. A number of discrete piezoceramic elements are arranged along a curve forming an ultrasound resonator having a diameter of at least about 10 cm and a radius of curvature up to about 20 cm, and operated at an ultrasound frequency below about 500 kHz. The volume between the ultrasound resonator and a terminating membrane through which the pressure waves pass is filled with a A having an acoustic impedance higher than water, preferably greater than or equal to the acoustic impedance of ethylene glycol, so that the piezoceramic elements, forming the pressure source, can be disposed closer to the focus, thereby reducing losses due to non-linear attenuation. The overall efficiency of the lithotripter is thereby increased, and the load of acoustical energy on the patient is diminished. A coupling member may be disposed between the terminating membrane and the patient.

REFERENCES:
patent: 4217516 (1980-08-01), Iinuma et al.
patent: 4281550 (1981-08-01), Erikson
patent: 4526168 (1985-07-01), Hassler et al.
patent: 4610249 (1986-09-01), Makofski et al.
"Der Ultraschall", Bergmann, pp. 374-381, 955 (1954).

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