Ultrasonic treatment of pathological tissue
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United States of America Patent
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May 11, 1993
Issued Date -
N/A
app pub date -
Sep 20, 1991
filing date -
Mar 1, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for generating sonic signal forms for limiting, preventing or regressing the growth of pathological tissue comprises an ultrasonic transmission system for transmitting sound waves, focussed on the tissue to be treated, by way of a coupling medium. An ultrasonic signal produced at the focus of the system comprises brief pulses having at least one rarefaction phase with a negative sonic pressure amplitude with a value greater than 2.times.10.sup.5 Pa. The ultrasonic signal is radiated with a carrier frequency exceeding 20 kHz, a sonic pulse duration T of less than 100 .mu.s and a pulse recurrence rate of less than 1/(5T). The device produces controlled cavitation in the tissue to be treated.
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