Patent ID: 8539670

Claim:
A method for producing a hermetic and electrically insulating feedthrough for electrical connection through an electrically conductive metal wall, said wall having an external side and an internal side, the method comprising: a) forming an electrically insulating external layer on the external side of the electrically conductive metal wall and an electrically insulating internal layer on the internal side of the electrically conductive metal wall; b) forming, on the internal side of the electrically conductive metal wall, a non-through groove having a closed contour defining in the electrically conductive metal wall a metal islet that is physically and electrically isolated from the rest of the electrically conductive metal wall, the islet formed by removing the entire thickness of the electrically insulating internal layer and of the electrically conductive metal wall and leaving the electrically insulating external layer intact to have a thickness sufficient to mechanically support the metal islet; and c) exposing an external pad on the external side of the electrically conductive metal wall and an internal pad on the internal side of the electrically conductive metal wall for making electrical contacts to the metallic islet, the pads exposed by removing material corresponding to the thickness of the electrically insulating external layers and the electrically insulating internal layers, respectively.