An intermediate board has a board core formed by a main core body and a sub-core portion. The control circuit receives an input signal and provides an output signal to the ballast controller IC. The polar liquid may be one or more of an aromatic liquid, a polar aprotic liquid, a ketone-containing liquid, an ester-containing liquid, an ether-containing liquid, an amide-containing liquid and a sulfoxide-containing liquid. The section assumes different heights relative to a part of the floor wall of the first partial region in the at least two positions, wherein the section assumes for at least one of the at least two positions a height above a height of the part of the floor wall of the first partial region. The microlens directs light onto the light sensitive device. The catheter is advanced toward a target destination within the vasculature.