Patent ID: 6032075
Filing Date: 2000-02-29
Classification: A61N

Abstract:
An hermetically sealed implantable medical device, comprising:(a) an hermetically sealed housing;(b) an energy source disposed within the housing;(c) a substantially flat electrolytic capacitor connected to the energy source and disposed within the housing, the capacitor comprising:(i) at least one flat cathode layer formed of cathode foil;(ii) a plurality of cold-welded flat anode layers formed of anode foil, the plurality of cold-welded anode layers forming an anode sub-assembly having a thickness T and top and bottom surfaces, the top and bottom surfaces of the anode sub-assembly having corresponding at least one vertically-aligned cold-welded region formed thereon, the at least one cold-welded region of the anode sub-assembly having a thickness T+.DELTA.T, the ratio .DELTA.T/T of the anode sub-assembly being less than or equal to 0.50;(iii) at least a first separator layer formed of separator material and defined by a third perimeter;(iv) a capacitor case having sidewalls extending upwardly from a substantially flat planar base to form an open end;(v) a cover for sealing the open end of the capacitor case, the cover being disposed over and hermetically sealing the open end of the case;wherein the at least one cathode layer, the anode sub-assembly and the first separator layer are vertically stacked in the case such that the first separator layer is disposed between the at least one cathode layer and the anode sub-assembly.