Shifting of transducer array to reduce skin irritation

A transducer apparatus for delivering tumor treating fields to a subject's body, the transducer apparatus comprising:

• an array of electrodes, the array configured to be positioned over the subject's body with a face of the array facing the subject's body, said array comprising electrode elements positioned in existing electrode positions arranged around a centroid of the array, and each tracing an existing electrode footprint;
• wherein the array further comprises potential electrode positions arranged around the centroid of the array, each potential electrode position tracing a potential electrode footprint,
• wherein each potential electrode footprint has an identical shape, area, and distance from the centroid, as that of one or more existing electrode footprints, and in rotational coincidence about the centroid with said one or more existing electrode footprints,
• wherein the array further comprises one or more medication regions encompassing at least 40% of an areal footprint defining potential electrode positions,
• wherein each medication region comprises (i) a substrate capable of at least one of receiving, absorbing, or holding a topical medication thereon or therein, and, optionally, (ii) a topical medication integrated in or on the medication substrate,
• such that a rotational shift of the electrode array about the centroid may position at least one potential electrode position to be coincident upon an existing electrode position, thereby after the rotation providing a resting state or applying the topical medication to an area of skin formerly beneath at least one electrode.

A transducer apparatus for delivering tumor treating fields to a subject's body, the transducer apparatus comprising:

• an array of electrodes, the array configured to be positioned over the subject's body with a face of the array facing the subject's body;
• and
• a medication region, where no exposed adhesive is present, located between at least one pair of adjacent electrodes of the array when viewed from a direction perpendicular to the face of the array,
• wherein the medication region comprises:
• a medication substrate;
• and
• a topical medication integrated in or on the medication substrate.