Patent ID: 6388866
Filing Date: 2002-05-14
Classification: A61N

Abstract:
An implantable medical device comprising:a housing; an electronics module disposed within the housing; an energy source within the housing electrically coupled to the electronics module; a capacitor assembly within the housing electrically coupled to the electronics module, the capacitor further comprising: a sealed capacitor case defining an interior case chamber, the case having a base having a base peripheral edge, a case side wall extending between the base peripheral edge through a side wall height to a side wall opening edge defining a case opening edge and a case chamber height Hcw; a cover adapted to be sealed against the case opening edge to enclose an interior case chamber, whereby the interior case chamber has a case chamber periphery defined by said case side wall; and an electrode stack assembly located within the interior case chamber, the electrode stack assembly having a stack periphery configured in mating relation with the case chamber periphery and further comprising a plurality of N capacitor layers stacked in registration upon one another and between the case base and the cover through a stack height HN selected to be equal to or less than the case chamber height Hcw by a predetermined tolerance, wherein N1 capacitor layers of the N capacitor layers each have a first capacitor layer thickness TCL1 and N2 capacitor layers of the N capacitor layers each have a second capacitor layer thickness TCL2, whereby the stack height HN is dependent upon N1*TCL1+N2*TCL2, wherein each of the N1 capacitor layers include a first anode sub-assembly having a first anode sub-assembly thickness corresponding to a first number of anode layers, each of the first number of anode layers having a first anode layer thickness, and each of the N2 capacitor layers include a second anode sub-assembly having a second anode sub-assembly thickness corresponding to a second number of anode layers, each of the second number of anode layers having a second anode layer thickness, wherein the first number of anode layers not being equal to the second number of anode layers corresponds to a first condition, and one of the first number of anode layers not being equal to the second number of anode layers and the first number of anode layers being equal to the second number of anode layers corresponds to a second condition, and wherein the first anode sub-assembly thickness not being equal to the second anode subassembly thickness is achieved by one of the first condition and the second condition and corresponding variations in the first anode layer thickness and the second anode layer thickness.