Abstract: A multi-leaded, filter feed-thru assembly for implantable medical devices, such as heart pacemakers, defibrillators, and neurostimulators, which integrates both multi-element semiconductor devices and passive component devices, or multi-element combinations thereof, together with a discoidal capacitive filter device to provide filtration of electromagnetic interference is provided. The assembly additionally provides for the suppression of high voltage transients from defibrillation and electrocautery procedures, as well as providing additional circuit and network functions.

Abstract: A feed-through filter assembly such as may be used in an implantable medical device. The assembly includes a conductive mounting element which may be hermetically sealed to an outer housing of the implantable medical device. In many embodiments, the conductive mounting element will be a conductive canister in which a feed-through filter structure is located. Alternatively, the conductive mounting element may include a suitable subplate structure. Because the filter structure exhibits both varistor and capacitive characteristics, effective transient suppression and interference filtering is achieved in a single package. Secondary filtering may be provided downstream of the filter assembly for additional interference filtering at lower frequencies.