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Air-core microwave ablation antennas

  • US 7,244,254 B2
  • Filed: 09/28/2005
  • Issued: 07/17/2007
  • Est. Priority Date: 04/29/2004
  • Status: Active Grant
First Claim
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1. A device for delivery of microwave power to an antenna, comprising:

  • a coaxial cable having an outer conductor and an inner conductor; and

    a plurality of supports in the coaxial cable for holding and centering the inner conductor relative to the outer conductor, wherein a space is defined in the coaxial cable between adjacent supports; and

    a gas dielectric filling the space between adjacent supports such that the coaxial cable utilizes air or other gas as a dielectric core;

    wherein the plurality of supports each have at least one flow channel allowing for the passage of gas through each support;

    wherein the coaxial cable has a proximal end and a distal end, wherein the distal end is closed and the proximal end is open such that gas may only enter or exit the device through the proximal end of the coaxial cable.

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