Air-core microwave ablation antennas
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United States of America Patent
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Jul 17, 2007
Grant Date -
Dec 7, 2006
app pub date -
Sep 28, 2005
filing date -
Apr 29, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A method and device delivers microwave power to an antenna through a coaxial cable utilizing air or other gases as its dielectric core. The cable includes supports made of low-loss materials to keep the inner conductor centered in the cable, and defining spaces therebetween for the air or gas. Channels in the supports allow the air or gas to circulate in the cable. The gas may be chilled or cooled to provide an addition level of heat dissipation. The device enables delivery of large amounts of power to tissue without undue heating of the feed cable or peripheral tissues, and without increasing the diameter of the feeding cable or antenna, keeping the antenna safe for percutaneous use.
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