Ultrasonic freeze ablation catheters and probes
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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Dec 20, 1990
filing date -
Dec 20, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Probes for medical surgery and flexible catheters for internal tissue ablation in which the tissue cells are frozen and deadened and yet extreme supercooling of tissue below the tissues' melting point is not required. The tissue cells are moderately supercooled by the probe or catheter and freezing of the cells is caused by cavitation nucleation of ice particles within the cells induced by a low power ultrasonic wave generator. The ultrasonic energy causes well distributed nucleation in the supercooled tissue cells and, as a result, the cells rapidly freeze and, due to such freezing, expand and burst their membranes.
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