An energy conveying structure for invasive electrosurgery, the energy conveying structure comprising a coaxial layered structure having: an innermost insulating layer; an inner conductive layer formed on the innermost insulating layer; an outer conductive layer formed coaxially with the inner conductive layer; and a dielectric layer separating the inner conductive layer and the outer conductive layer, wherein the inner conductive layer, the outer conductive layer and the dielectric layer form a transmission line for conveying radiofrequency and/or microwave energy, characterised in that: the coaxial layered structure is insertable in a flexible insertion tube of an invasive surgical scoping device, wherein the innermost insulating layer is hollow to form an instrument channel of the invasive surgical scoping device, and characterized in that the energy conveying structure includes: a first terminal that is electrically connected to the inner conductive layer and which extends through the innermost insulating layer into the instrument channel; and a second terminal that is electrically connected to the outer conductive layer and which extends through the dielectric layer and innermost insulating layer into the instrument channel. an innermost insulating layer; an inner conductive layer formed on the innermost insulating layer; an outer conductive layer formed coaxially with the inner conductive layer; and a dielectric layer separating the inner conductive layer and the outer conductive layer, wherein the inner conductive layer, the outer conductive layer and the dielectric layer form a transmission line for conveying radiofrequency and/or microwave energy, characterised in that: the coaxial layered structure is insertable in a flexible insertion tube of an invasive surgical scoping device, wherein the innermost insulating layer is hollow to form an instrument channel of the invasive surgical scoping device, and characterized in that the energy conveying structure includes: a first terminal that is electrically connected to the inner conductive layer and which extends through the innermost insulating layer into the instrument channel; and a second terminal that is electrically connected to the outer conductive layer and which extends through the dielectric layer and innermost insulating layer into the instrument channel. the coaxial layered structure is insertable in a flexible insertion tube of an invasive surgical scoping device, wherein the innermost insulating layer is hollow to form an instrument channel of the invasive surgical scoping device, and characterized in that the energy conveying structure includes: a first terminal that is electrically connected to the inner conductive layer and which extends through the innermost insulating layer into the instrument channel; and a second terminal that is electrically connected to the outer conductive layer and which extends through the dielectric layer and innermost insulating layer into the instrument channel. a first terminal that is electrically connected to the inner conductive layer and which extends through the innermost insulating layer into the instrument channel; and a second terminal that is electrically connected to the outer conductive layer and which extends through the dielectric layer and innermost insulating layer into the instrument channel.