Patent ID: 9636176
Date: 2017-05-02
CPC Classifications: A61B,H01Q

Claim:
1. An electrosurgical resection instrument for applying to biological tissue radiofrequency (RF) electromagnetic (EM) energy having a first frequency and microwave EM energy having a second frequency higher than the first frequency, the instrument comprising: an instrument tip comprising a body made of a first dielectric material separating a first conductive element from a second conductive element; a coaxial feed cable comprising an inner conductor, an outer conductor coaxial with the inner conductor, and a second dielectric material separating the outer conductor and the inner conductor, the coaxial feed cable being for conveying, simultaneously or separately, an RF signal having the first frequency and a microwave signal having the second frequency; a fluid feed conduit for delivering fluid to the instrument tip; wherein the inner conductor is electrically connected to the first conductive element and the outer conductor is electrically connected to the second conductive element to enable the instrument tip to receive the RF signal and the microwave signal, and wherein the first conductive element and the second conductive element are arranged to act: wherein the fluid feed conduit is arranged to deliver liquid to the instrument tip, the fluid feed conduit having an outlet at the distal end of the instrument tip for introducing the liquid into the biological tissue, wherein the instrument tip further comprises a planar transmission line element in which the body of the first dielectric material is a substantially planar element, the first conductive element is a first conductive layer on a first surface of the substantial planar element, and the second conductive element is a second conductive layer on a second surface of the substantial planar element that is opposite to the first surface, and wherein the first surface of the substantially planar element and the second surface of the sustainably planer element extend between the first conductive element and the second conductive element in a direction parallel to a longitudinal axis of the coaxial feed cable; wherein both the first conductive layer and the second conductive layer extend up to at least one edge of the planer element in a region designated as an RF cutting portion, and are set back from the edges of the planer element except at the RF cutting portion; and wherein the instrument further comprises a common carrier tube for conveying the fluid flow conduit and the coaxial cable together to the instrument tip body.