Flexible Faraday Shield for Medical Sensor EMI
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Solution Overview
Problem
Medical sensors, particularly pulse oximeters, face challenges in maintaining measurement quality due to bulkiness and inflexibility caused by traditional metallic shielding materials, which also degrade over time, leading to reduced electromagnetic interference (EMI) shielding efficiency.
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, replacing traditional metallic shields to enhance conformance, flexibility, and EMI/RFI shielding without the drawbacks of degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional metallic shielding materials are used in medical sensors, then EMI shielding effectiveness is improved, but sensor flexibility and patient comfort deteriorate
Solution Approach 1:
The patent changes the material parameters from traditional rigid metallic shields to flexible conductive materials such as conductive polymers, conductive adhesives, and metallic fabrics. These materials maintain the essential electrical conductivity parameter for EMI shielding while altering the mechanical properties to provide flexibility, thereby resolving the contradiction between shielding effectiveness and sensor flexibility.
Solution Approach 2:
The patent employs composite material structures combining conductive elements with flexible substrates. Examples include conductive polymer composites, metallic fabric laminates, and hybrid structures integrating conductive adhesives with flexible circuits. These composites achieve both EMI shielding performance and mechanical flexibility simultaneously.
2Object-affected harmful factors
If traditional metallic shielding materials are used in medical sensors, then EMI shielding effectiveness is improved, but sensor durability deteriorates due to degradation over time
Solution Approach 1:
The patent transitions from traditional metallic materials to advanced conductive polymers and composite materials that exhibit superior resistance to oxidation, corrosion, and environmental degradation. These material parameter changes enhance long-term reliability while maintaining EMI shielding effectiveness.
Solution Approach 2:
The patent describes remanufacturing processes that restore degraded sensors to like-new condition by replacing flexible Faraday shields and other components. This approach extends sensor lifecycle and improves durability through systematic component renewal rather than relying solely on inherently durable materials.
3Object-affected harmful factors
If traditional metallic shielding materials are used in medical sensors, then EMI shielding effectiveness is improved, but sensor bulkiness increases
Solution Approach 1:
The patent utilizes thin-film conductive materials including conductive polymer coatings, metallic fabric laminates, and flexible circuit traces that provide EMI shielding in ultra-thin configurations. These thin-film structures dramatically reduce the volume and bulkiness of sensors while maintaining effective EMI shielding through optimized material properties and geometric arrangements.
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 improves patient comfort by increasing sensor flexibility and durability while maintaining effective EMI/RFI shielding, reducing waste through the reuse of components in remanufactured sensors and cables, and lowering production costs.
Implementation Method 1
The flexible, electrically conductive materials may be used to form a Faraday shield for mitigation of EMI and/or RFI in electrical leads and/or circuitry of the sensor and cable
Data Source
AI summary
Present embodiments include a remanufactured bandage-type medical sensor having an optical assembly with an emitter adapted to transmit one or more wavelengths of light and a photodetector adapted to receive the one or more wavelengths of light transmitted by the emitter. The sensor also includes a laminate assembly having an electrically conductive adhesive transfer tape (ECATT) layer disposed over the photodetector, and the ECATT layer is adapted to shield the photodetector from electromagnetic interference (EMI). A nonconductive layer supports the emitter, the photodetector, and the ECATT layer within the sensor. At least a portion of the optical assembly is from a used bandage-type medical sensor, and at least a portion of the laminate assembly is new.