A system and method for converting a non-cognitive radio into a cognitive radio is presented. A far-field interval window is set following the delivery of the ventricular stimulation, during which a far-field signal is detected and compared to a signal representing a predetermined far-field R-wave that represents successful capture of one or both ventricular chambers. An outer shell of the hollow structure includes both of a part made of only metal and a part made of only fiber reinforced plastic.