Piezoelectric device with reduced negative waves, and use of said device for extracorporeal lithotrity or for destroying particular tissues
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United States of America Patent
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May 14, 1991
Issued Date -
N/A
app pub date -
Dec 1, 1989
filing date -
Sep 7, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a device generating ultrasonic waves focused in aocal point. Said generator device comprises a plurality of transducer elements arranged externally on a support means for focusing into a focal point, such as a circular dome, and is characterized in that the transducer elements are divided into at least two groups of transducer elements, of which the resonance frequency differs in such a way that the principal positive ultrasonic waves produced by each group add up together and the positive and negative secondary ultrasonic waves are at least partly cancelled, thus reducing significantly the negative waves. This device can be advantageously used for extracorporeal lithotripsy.
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