| CPC A61N 1/3754 (2013.01) [A61N 1/05 (2013.01)] | 23 Claims |
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1. An assembly that is attachable to an active implantable medical device (AIMD), the assembly comprising:
a) a feedthrough, comprising:
i) an electrically conductive ferrule comprising a ferrule sidewall defining a ferrule opening extending to a ferrule body fluid side spaced from a ferrule device side;
ii) an insulator hermetically sealed to the ferrule in the ferrule opening, the insulator extending to an insulator body fluid side spaced from an insulator device side, wherein, when the ferrule hermetically sealed to the insulator is attached to an opening in a housing of an AIMD, the ferrule body fluid side adjacent to the insulator body fluid side, and the ferrule device side adjacent to the insulator device side reside outside and inside the AIMD, respectively; and
iii) a first terminal pin hermetically sealed to the insulator in a first via hole by a first braze, and a second terminal pin hermetically sealed to the insulator in a second via hole by a second braze, wherein the first and second terminal pins extend outwardly beyond the insulator device side; and
b) a polymeric washer positioned on the insulator device side, the polymeric washer comprising at least a washer first opening and a washer second opening through which the respective first and second terminal pins extend, wherein:
i) the washer first opening comprises a washer first opening inner arcuate portion that contacts the first terminal pin and a washer first opening outer perimeter portion that is spaced from the first terminal pin and that exposes a portion of the first braze hermetically sealing the first terminal pin to the insulator in the first via hole; and
ii) the washer second opening comprises a washer second opening inner arcuate portion that contacts the second terminal pin and a washer second opening outer perimeter portion that is spaced from the second terminal pin and that exposes a portion of the second braze hermetically sealing the second terminal pin to the insulator in the second via hole,
iii) wherein, in an imaginary configuration having the washer first and second openings superimposed one on top of the other and when measured with respect to their orientations in the polymeric washer, the cumulative arcuate distance of the respective washer first and second opening inner arcuate portions about one of the first and second terminal pins, subtracting overlap, results in a gap between the superimposed washer first and second opening inner arcuate portions that is less than a diameter of either of the first and second terminal pins so that the polymeric washer is prevented from lateral movement with respect to the insulator device side.
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