Thin-Film Neural Interface With Polymer Backing Adhesion
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Solution Overview
Problem
Conventional neural interfaces face mechanical mismatch with neural tissue due to rigid substrates, leading to adhesion degradation and potential release of electrodes, which compromises mechanical and performance reliability.
Innovation Solution
A thin-film neural interface with a supporting structure of dielectric material, conductive traces, and electrodes, where a medical-grade polymer backing fills through holes or patterns for enhanced mechanical adhesion, and a method of manufacturing involving a mandrel and backing material injection or reflow to secure the backing to the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible substrates are used for neural interfaces, then design flexibility and scalability are improved, but mechanical adhesion to neural tissue degrades over time
Solution Approach 1:
The substrate is segmented into multiple thin layers (first substrate layer, second substrate layer, third substrate layer) with intermediate adhesive layers between them. This segmentation allows each layer to contribute specific properties: flexibility from thin layers, adhesion from intermediate layers, and structural integrity from the stacked configuration, resolving the contradiction between design flexibility and mechanical adhesion reliability.
Solution Approach 2:
The patent employs composite material structure by combining different substrate materials (polyimide, PEEK, or glass) with intermediate adhesive layers. This composite approach integrates the flexibility benefits of polyimide/PEEK with the adhesion properties of the intermediate layers, while the glass layer provides structural stability, thereby achieving both design flexibility and reliable mechanical adhesion simultaneously.
2Strength
If conventional lead assemblies are used, then mechanical strength is maintained, but device size and complexity increase
Solution Approach 1:
The patent merges multiple functional layers (conductive traces, insulating layers, adhesive layers, and protective coatings) into a single integrated thin-film substrate structure. This consolidation eliminates the need for separate conventional lead assembly components while maintaining mechanical strength through the stacked layer configuration, thereby reducing device complexity without sacrificing strength.
Solution Approach 2:
The patent replaces rigid conventional lead assemblies with flexible thin-film substrates that have integrated conductive traces and functional layers. These thin films provide sufficient mechanical strength for neural interface applications while dramatically reducing device complexity and enabling miniaturization, as the entire lead assembly functionality is embedded within the flexible substrate itself.
Data Source
AI summary
The present disclosure relates to thin-film lead assemblies and neural interfaces, and methods of microfabricating thin-film lead assemblies and neural interfaces. Particularly, aspects of the present disclosure are directed to a thin-film neural interface that includes a proximal end, a distal end, a supporting structure that extends from the proximal end to the distal end, one or more of conductive traces formed on a portion of the supporting structure, one or more electrodes formed on the front side of the supporting structure in electrical connection with the one or more conductive traces, and a backing formed on the back side of the supporting structure. The supporting structure comprises one or more features to facilitate mechanical adhesion between the supporting structure and the backing.