EMI feedthrough filter terminal assembly having surface mounted, internally grounded hybrid capacitor

An EMI feedthrough filter terminal assembly, comprising:

• a feedthrough filter capacitor having first and second sets of electrode plates, a plurality of first passageways therethrough each having a distinct first termination surface conductively coupling a distinct first set of electrode plates, a second passageway therethrough having a second termination surface conductively coupling the second set of electrode plates, and a plurality of third termination surfaces exteriorly conductively coupling the second set of electrode plates;
• a conductive ferrule adjacent to the feedthrough filter capacitor, having a plurality of oxide resistant biostable conductive pads on a surface thereof corresponding to the plurality of third termination surfaces, each conductive pad being conductively coupled to a respective third termination surface;
• a plurality of conductive terminal pins each extending through a respective first passageway in conductive relation with the respective first set of electrode plates, and through the ferrule in non-conductive relation;
• and
• at least one conductive ground lead extending through the second passageway in conductive relation with the second set of electrode plates.

An EMI feedthrough filter terminal assembly for medical implant applications, comprising:

• a feedthrough filter capacitor having first and second sets of electrode plates, a plurality of first passageways therethrough each having a distinct first termination surface conductively coupling a distinct first set of electrode plates, a second passageway therethrough having a second termination surface conductively coupling the second set of electrode plates, and a plurality of third termination surfaces exteriorly conductively coupling the second set of electrode plates;
• a conductive ferrule adjacent to the feedthrough filter capacitor, having a plurality of oxide resistant biostable conductive pads on a surface thereof corresponding to the plurality of third termination surfaces, each conductive pad being conductively coupled to a respective third termination surface;
• a plurality of conductive terminal pins each extending through a respective first passageway in conductive relation with the respective first set of electrode plates, and through the ferrule in non-conductive relation;
• at least one conductive ground lead extending through the second passageway and the ferrule in conductive relation with the second set of electrode plates;
• an oxide resistant biostable hermetic seal between the ground lead and the ferrule, for conductively coupling the ferrule to the second termination surface;
• and
• an insulator fixed to the ferrule for supporting the terminal pins in conductive isolation from the ferrule;
• wherein the ground lead, the ferrule and the insulator comprise a pre-fabricated hermetic terminal pin sub-assembly.