- Patent Title: Self-centering ceramic washer that prevents misalignment when positioned between a feedthrough and an EMI filter capacitor or a circuit board supporting EMI filter capacitors for a medical device
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Application No.: US18633096Application Date: 2024-04-11
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Publication No.: US12268889B1Publication Date: 2025-04-08
- Inventor: Jason Woods , Robert A. Stevenson , Christine A. Frysz , Thomas Marzano , Keith W. Seitz
- Applicant: Greatbatch Ltd.
- Applicant Address: US NY Clarence
- Assignee: Greatbatch Ltd.
- Current Assignee: Greatbatch Ltd.
- Current Assignee Address: US NY Clarence
- Agent Michael F. Scalise
- Main IPC: A61N1/375
- IPC: A61N1/375 ; F16B43/00 ; H01G4/35 ; H01R13/52 ; H01R13/533 ; H05K1/02

Abstract:
A self-centering ceramic washer is positioned between a feedthrough and a filter circuit board. The washer has openings through which first and second terminal pins extend. A first opening has an inner arcuate portion contacting the first terminal pin and an outer perimeter portion exposing the braze sealing the terminal pin to the insulator. A second opening has an inner arcuate portion contacting the second terminal pin and an outer perimeter portion exposing the braze sealing the terminal pin to the insulator. In an imaginary configuration with the first and second washer openings superimposed one on top of the other, the cumulative arcuate distance of the inner arcuate portions about one of the terminal pins, subtracting overlap, results in a gap between the superimposed washer openings that is less than a diameter of the first and second terminal pins so that the washer is prevented from lateral movement.
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