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Step-down coaxial microwave ablation applicators and methods for manufacturing same

  • US 9,987,087 B2
  • Filed: 03/28/2014
  • Issued: 06/05/2018
  • Est. Priority Date: 03/29/2013
  • Status: Active Grant
First Claim
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1. A microwave ablation applicator comprising:

  • a feed-line segment including a first inner conductor, a first dielectric disposed on an outer surface of the first inner conductor and having a first face in a plane perpendicular to a longitudinal axis of the first inner conductor, and a first outer conductor disposed on the outer surface of the first dielectric;

    a step-down segment adjacent to a distal end portion of the feed-line segment and including a second inner conductor, a second dielectric having a diameter less than a diameter of the first dielectric and disposed on the outer surface of the second inner conductor, and a second outer conductor disposed on the outer surface of the second dielectric; and

    a radiator base segment adjacent to a distal end portion of the step-down segment and including a third inner conductor, a third dielectric having a diameter less than the diameter of the first dielectric and disposed on the outer surface of the third inner conductor, a third outer conductor disposed on the outer surface of a proximal end portion of the third dielectric so as to form a feed gap at a distal end portion of the radiator base segment, a balun dielectric disposed on the outer surface of the third outer conductor, and a balun outer conductor disposed on the outer surface of the balun dielectric, the third outer conductor having a length that is less than a length of the third dielectric so as to form the feed gap,wherein a length of the step-down segment is based on a wavelength of an operation frequency of the microwave ablation applicator,wherein the balun outer conductor is directly connected to a proximal end portion of the third outer conductor,wherein the step-down segment includes multiple steps, andwherein a ferrule is disposed at each of the steps of the step-down segment.

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