Conductive Adhesive Faraday Shield for Medical Sensor EMI
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Solution Overview
Problem
Medical sensors, particularly pulse oximeters, face challenges in mitigating electromagnetic interference (EMI) and radio frequency interference (RFI) due to the bulkiness and inflexibility of traditional shielding materials, which can degrade and lose efficiency, affecting the quality and comfort of measurements.
Innovation Solution
The use of flexible electrically conductive materials such as electrically conductive adhesive transfer tapes (ECATT) and conductive polymers as Faraday shields in medical sensors and cables to provide EMI/RFI shielding, replacing traditional metallic shields, allowing for enhanced conformance to patient tissue and increased flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metallic shielding materials are used in medical sensors, then EMI/RFI shielding effectiveness is improved, but flexibility and comfort are worsened
Solution Approach 1:
The patent changes the material parameters from traditional rigid metallic shields to flexible conductive materials such as conductive polymers, conductive fabrics, and conductive adhesives. These materials maintain the essential electrical conductivity parameter for EMI/RFI shielding while fundamentally changing the mechanical properties to provide flexibility, conformability, and patient comfort in medical sensor applications
Solution Approach 2:
The patent employs composite material structures combining conductive fillers (such as metal particles, fibers, or flakes) embedded in flexible polymer matrices or fabric substrates. This composite approach achieves both EMI/RFI shielding effectiveness through the conductive network and flexibility through the polymer or fabric base material, resolving the contradiction between shielding performance and mechanical compliance
2Reliability
If traditional metallic shielding materials are used in medical sensors, then EMI/RFI shielding effectiveness is improved, but durability is worsened due to degradation and breakage
Solution Approach 1:
The patent transitions from rigid metallic shielding to flexible conductive materials that are inherently more resistant to mechanical degradation. The flexible polymer and fabric-based conductive materials do not suffer from the same brittleness, fatigue, and breakage issues as traditional metallic shields, thereby improving durability while maintaining shielding effectiveness through their conductive network structure
Solution Approach 2:
The patent describes flexible conductive shielding materials that can be integrated into disposable medical sensor systems. These materials maintain shielding effectiveness throughout the product lifecycle and can be disposed of after use, eliminating durability concerns entirely while providing cost-effective shielding for single-use medical applications
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 solution enhances the flexibility and durability of medical sensors and cables, reducing interference while maintaining measurement quality and patient comfort, and offers a cost-effective method for remanufacturing used sensors and cables with improved shielding efficiency.
Implementation Method 1
a laminated sensor body having several layers. One layer may be an electrically conductive adhesive transfer tape (ECATT) layer disposed about a detector of the sensor to reduce EMI/RFI
Implementation Method 2
a cable, such as a sensor cable, may incorporate one or more conductive polymers extruded or otherwise disposed over one or more wires of the cable... providing enhanced flexibility and EMI/RFI shielding for the cable
Data Source
AI summary
Present embodiments include a bandage sensor having an electrically conductive adhesive transfer tape layer as a Faraday shield. The electrically conductive transfer tape layer may be used in lieu of a fully metallic Faraday shield. The present embodiments also include a sensor cable having one or more conductive polymer EMI/RFI shields in place of a fully metallic EMI/RFI shield. Methods for manufacturing and remanufacturing such sensors and cables are also disclosed.