Ultrasonic apparatus for therapeutical use
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Jun 27, 1989
filing date -
Jul 1, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ultrasonic apparatus for thereapeutical use, especially for remedying a malignant tumor, through activation of a drug at a desired local portion inside of a living body by sequentially irradiating a plurality kinds of convergent ultrasonic waves having different focal positions of different acoustic pressure distribution shapes but having a mutually overlapping focal zone and by switching them within a short period. The drug is activated as a promotor for an ultrasonic therapeutical effect through continuous generation and rupture of cavitation caused by the irradiated and switched ultrasonic waves.
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