Laminated Insulative Seal for EMI Feedthrough Filter Terminal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing EMI feedthrough filter assemblies for medical devices lack an effective configuration to prevent the entry of body fluids and efficiently decouple interference signals, leading to a need for an improved hermetic seal and interference shielding solution.
Innovation Solution
The EMI feedthrough filter terminal assembly incorporates a laminated insulative layer between the feedthrough filter capacitor and insulator, featuring a ceramic feedthrough filter capacitor with alternating electrode layers, a conductive ferrule, and hermetic sealing materials to prevent fluid entry and shield electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hermetic seal is provided to prevent body fluid entry, then reliability is improved, but device complexity increases due to additional insulator structure and mounting requirements
Solution Approach 1:
The patent combines the insulator and seal functions into a single integrated insulator structure. The insulator is designed with features that simultaneously provide electrical isolation and hermetic sealing, eliminating the need for separate sealing components and reducing assembly complexity while maintaining reliability.
Solution Approach 2:
The insulator structure is designed to perform multiple functions: electrical insulation, hermetic sealing, and mechanical support for terminal pins. This multi-functional design reduces the number of separate components needed while achieving both reliability and simplicity goals.
2Object-affected harmful factors
If ceramic feedthrough filter capacitor is combined with hermetic terminal pin assembly, then electromagnetic interference shielding is improved, but device complexity increases due to integration requirements
Solution Approach 1:
The patent integrates the ceramic feedthrough filter capacitor directly into the hermetic terminal pin assembly structure. The capacitor is positioned and connected such that it forms an integrated EMI filtering solution within the terminal assembly, reducing the number of separate components and simplifying the overall device architecture while maintaining effective EMI shielding.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides a hermetic seal and effective decoupling of electromagnetic interference, ensuring the integrity of medical device electronics while preventing body fluid ingress and enhancing performance with low parasitic capacitance and ESR.
Implementation Method 1
a feedthrough filter capacitor having a plurality of first electrode layers and a plurality of second electrode layers
Implementation Method 2
a laminated insulative layer between the insulator and the feedthrough filter capacitor
Data Source
AI summary
The present invention is directed to an EMI feedthrough filter terminal assembly. The EMI feedthrough filter terminal assembly comprises: a feedthrough filter capacitor having a plurality of first electrode layers and a plurality of second electrode layers, a first passageway therethrough having a first termination surface conductively coupling the plurality of first electrode layers, a second termination surface conductively coupling the plurality of second electrode layers; a feedthrough ferrule conductively coupled to the feedthrough filter capacitor via the second termination surface; at least one conductive terminal pin extending through the passageway in conductive relation with the plurality of first electrode layers; an insulator fixed to the feedthrough ferrule for conductively isolating the conductive terminal pin from the feedthrough ferrule; and a laminated insulative layer between the insulator and the feedthrough filter capacitor.