Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1993-05-03
1994-07-26
Reynolds, Bruce A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
29 2542, 333182, 333185, H01G 442
Patent
active
053330951
ABSTRACT:
A feedthrough filter capacitor assembly and related installation method are provided for shielding a conductive terminal pin or lead of the type used, for example, in an implantable medical device such as a heart pacemaker or defibrillator, against passage of external interference signals. The feedthrough assembly includes a terminal pin subassembly having at least one terminal pin supported within a cylindrical conductive ferrule by a hermetically sealed insulator ring. The ferrule is adapted for mounting onto a conductive pacemaker housing, as by welding or brazing, to support the terminal pin for feedthrough passage to the housing interior. A co-axial filter capacitor is mounted at an inboard side of the pacemaker housing, with capacitor electrode plate sets coupled respectively to the pacemaker housing and to the terminal pin by a conductive adhesive or the like. In one preferred form, multiple filter capacitors are provided in a substantially coplanar array within a common base structure, with each capacitor in association with a respective terminal pin.
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Pruett Donald N.
Stevenson Robert A.
Maxwell Laboratories, Inc., Sierra Capacitor Filter Division
Mills Gregory L.
Reynolds Bruce A.
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