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1. WO2020142308 - ELECTROSURGICAL ANTENNA INCLUDING A FLUID FILLED BALUN

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[ EN ]

WHAT IS CLAIMED IS:

1. An energy applicator for directing energy to tissue, comprising:

a feedline including an inner conductor, an outer conductor coaxially disposed around the inner conductor, and a first dielectric material disposed therebetween;

an antenna including a radiating section operably coupled to the feedline; and

a balun structure coaxially disposed around the outer conductor of the feedline with a medium disposed therebetween, such that the balun structure is galvanically isolated from the feedline.

2. The energy applicator of claim 1, wherein the medium is a second dielectric material.

3. The energy applicator of claim 1, wherein the medium is air, de-ionized water, saline, or a coolant fluid.

4. The energy applicator of claim 1, further comprising a tube coaxially disposed around the outer conductor.

5. The energy applicator of claim 4, wherein the balun structure is composed of a metal coating on at least one of an inner surface of the tube or an outer surface of the tube.

6. The energy application of claim 5, further comprising a second balun structure composed of a second metal coating on at least one of the inner surface of the tube or the outer surface of the tube spaced apart from the balun structure.

7. The energy applicator of claim 1, wherein a length of the balun structure is approximately equal to half of a wavelength of the energy.

8. The energy applicator of claim 1, wherein the medium is a liquid fluid producing a dielectric buffering of electromagnetic wavelength on the radiating section of the antenna.

9. An energy application system for directing energy to tissue, comprising:

an energy generator;

a feedline configured to transmit energy from the energy generator, the feedline including an inner conductor, an outer conductor coaxially disposed around the inner conductor, and a first dielectric material disposed therebetween;

an antenna including a radiating section operably coupled to the feedline; and

a balun structure coaxially disposed around the outer conductor of the feedline with a medium disposed therebetween, such that the balun structure is galvanically isolated from the feedline.

10. The energy application system of claim 9, wherein the medium is a second dielectric material.

11. The energy application system of claim 9, wherein the medium is air, de-ionized water, saline, or a coolant fluid.

12. The energy application system of claim 9, further comprising a tube coaxially disposed around the outer conductor.

13. The energy application system of claim 12, further comprising a vacuum source coupled to the tube, wherein the tube is configured to provide suction proximate the antenna.

14. The energy application system of claim 12, further comprising a pump coupled to the tube, the pump being configured to pump a coolant fluid through the tube.

15. The energy application system of claim 12, wherein the balun structure is composed of a metal coating on at least one of an inner surface of the tube or an outer surface of the tube.

16. The energy application system of claim 15, further comprising a second balun structure composed of a second metal coating on at least one of the inner surface of the tube or the outer surface of the tube spaced apart from the balun structure.

17. The energy application system of claim 9, wherein a length of the balun structure is approximately equal to half of a wavelength of the energy.

18. The energy application system of claim 9, wherein the medium is a liquid fluid producing a dielectric buffering of electromagnetic wavelength on the radiating section of the antenna.