Electrosurgical devices with choke shorted to biological tissue
View Patent ↗A device for directing energy to tissue includes a feedline and a radiating portion electrically coupled to the feedline. The radiating portion includes a distal radiating section and a proximal radiating section. The feedline includes an inner conductor, an outer conductor and a first dielectric material disposed therebetween. The device also includes a choke disposed around at least a portion of the feedline. The choke includes a second dielectric material disposed around at least a portion of the outer conductor, wherein the second dielectric material includes at least one opening defined therein, and an electrically-conductive member disposed in the at least one opening electrically coupled to the outer conductor, wherein the electrically-conductive member is configured to contact tissue.
1. A device for directing energy to tissue, comprising:
a feedline including an inner conductor, an outer conductor and a first dielectric material disposed therebetween;
a radiating portion electrically coupled to the feedline, the radiating portion having a distal radiating section and a proximal radiating section; and
a choke disposed around at least a portion of the feedline, the choke including:
a second dielectric material disposed around at least a portion of the outer conductor, wherein the second dielectric material includes at least one opening defined therein; and
an electrically-conductive member disposed in the at least one opening electrically coupled to the outer conductor, wherein the electrically-conductive member is configured to contact tissue.
2. The device of claim 1 , wherein the electrically-conductive member is positioned about one-quarter of a wavelength from a proximal end of the proximal radiating section.
3. The device of claim 2 , wherein the electrically-conductive member is formed in a ring-like shape concentrically disposed around the outer conductor.
4. The device of claim 1 , wherein the electrically-conductive member includes a protrusion portion that protrudes outwardly relative to an outer surface of the second dielectric material.
5. The device of claim 1 , wherein the proximal radiating section includes at least a portion of the inner conductor and the first dielectric material and the distal radiating section includes a conductive element.
6. An ablation probe for providing energy to tissue, comprising:
an inner conductor;
an outer conductor coaxially surrounding the inner conductor, the outer conductor having a proximal portion and a distal portion;
a first dielectric material disposed between the inner conductor and the outer conductor;
a second dielectric material disposed around at least a portion of the distal portion of the outer conductor;
a third dielectric material disposed around the proximal portion of the outer conductor, wherein the third dielectric material includes an opening defined therein; and
an electrically-conductive member disposed in the opening electrically coupled to the proximal portion of the outer conductor, wherein the electrically-conductive member is configured to contact tissue.
7. The ablation probe of claim 6 , further comprising:
a feed point defined by the inner conductor and the outer conductor; and
a radiating portion electrically coupled to the feed point at a point distal to the feed point.
8. The ablation probe of claim 7 , wherein the feed point is positioned about one-half of a wavelength from a distal end of the radiating portion.
9. The ablation probe of claim 7 , wherein the electrically-conductive member is positioned about one-half of a wavelength from the feed point.
10. The ablation probe of claim 7 , wherein the electrically-conductive member is positioned about one-quarter of a wavelength from a proximal end of the radiating portion.
11. The ablation probe of claim 6 , wherein the electrically-conductive member includes a protrusion portion that protrudes outwardly relative to an outer surface of the third dielectric material.