Abstract
Electrohydraulic, electromagnetic and piezoelectric shock wave generators used in the treatment of renal calculi and gallstones have their focal zone determined by their geometrical parameters. A piezoelectric shock wave generator with electronic focalization is proposed. The system is composed of a bidimensional array of 25 piezoelectric independent transducers arranged in a spherical shell 10 cm in diameter. The electronic circuitry of the system includes 25 pulsers. The interdelay of each channel can be adjusted between 10 ns and 100 mu s by steps of 10 ns. The pressure at the surface of the shell was 22*10/sup 5/ Pa. The focal point can be electronically moved in an ellipsoidal zone 3 cm in diameter and 4 cm long. These values are large enough to follow the displacement of the renal calculus during respiration. >
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