Abstract: An apparatus for providing Tumor-Treating Fields comprises an electrode layer having a plurality of electrode elements. First and second electrode elements are spaced apart within the electrode layer along a first axis. The electrode layer has at least one filler structure having a first filler portion positioned within a space between the first and second electrode elements. The at least one filler structure is configured to provide the electrode layer with a substantially consistent height along the first axis. The apparatus can further have an upper adhesive layer, a lower adhesive layer, and a layer of anisotropic material therebetween. The plurality of electrode elements can be in electrical contact with the outwardly facing surface of the layer of anisotropic material.

Abstract: A medical probe such as a catheter (20) is guided within the body of a patient by determining the relative positions of the probe relative to another probe, as by transmitting non-ionizing radiation to or from field transducers (30, 230) mounted on both probes. In one embodiment, a site probe (28) is secured to a lesion within the body, and an instrument probe (200) for treating the lesion may be guided to the lesion by monitoring relative positions of the probes. Two or more probes may be coordinated with one another to perform a medical procedure.