Thermal treatment methods and apparatus with focused energy application
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United States of America Patent
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Feb 5, 2008
Grant Date -
Jan 12, 2006
app pub date -
Sep 16, 2005
filing date -
Jul 13, 2000
priority date (Note) -
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Abstract
A collapsible ultrasonic reflector incorporates a gas-filled reflector balloon, a liquid-filled structural balloon an ultrasonic transducer disposed within the structural balloon. Acoustic energy emitted by the transducer is reflected by a highly reflective interface between the balloons. In a cardiac ablation procedure, the ultrasonic energy is focused into an annular focal region to ablate cardiac tissue extending in an annular path along the wall. Devices for stabilizing the balloon structure and for facilitating collapse and withdrawal of the balloon structure are also disclosed.
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