A circuit board comprising a dielectric material provided with a conductive layer is drilled with laser operated at an energy density below the ablation threshold of the conductive layer. In at least one embodiment, the method includes determining as rib pixels which represent a rib, determining pixels which delimit an area inside the rib cage, determining pixels which represent a pixel of the liver and determining a probability, for each pixel inside the rib cage, as to whether the pixel belongs to the liver or not, with the aid of a Random Walker method. The semiconductor protective layer is disposed adjacent to the semiconductor layer and includes a composite lamination structure, which includes a protective layer formed of an insulating material capable of preventing de-oxygen of the semiconductor layer and an insulating layer formed of an insulating material to be etched more easily. The device is used to compensate for a deficit in resistance to being pulled out presented by an existing shallow foundation for a pylon.