Silicon Carbide and Carbon Electrode for Neural Interfaces
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Solution Overview
Problem
Conventional implantable neural interfaces (INIs) face limitations due to low impedance, small detection windows, poor long-term performance, foreign body response, and irreversible dissolution of noble metals, leading to undesirable damage and limited application in neural stimulation.
Innovation Solution
An electrode device comprising a silicon carbide base and capping layers with a carbon-based intermediate layer, such as graphene or pyrolyzed-photoresist-film, which replaces metal traces, enhancing biocompatibility and manufacturing efficiency, and allowing for chronic implantation with improved neural recording and stimulation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noble metals are used for INIs, then electrical recording capability is improved, but irreversible dissolution occurs causing damage to the human body
Solution Approach 1:
The patent changes the material parameter from noble metals to carbon-based materials (graphene, carbon nanotubes, amorphous carbon), fundamentally altering the electrochemical properties to eliminate dissolution while maintaining electrical recording capability. This material substitution resolves the contradiction by providing a non-dissolving alternative that preserves measurement functionality.
Solution Approach 2:
The patent employs composite material structures combining carbon-based materials with biocompatible substrates (silicon, glass, polymers). These composites integrate the electrical recording capabilities of carbon materials with the structural integrity and biocompatibility of substrate materials, achieving both measurement precision and safety without dissolution.
2Stability of the object's composition
If silicon-based materials are used for INIs, then structural stability is improved, but foreign body response and scar formation occur reducing long-term performance
Solution Approach 1:
The patent modifies the surface chemical composition parameter by coating silicon-based structures with carbon-based materials or biocompatible polymers. This changes the surface chemistry from silicon oxide (which triggers foreign body response) to carbon-rich or polymer surfaces that are more biocompatible, thereby improving long-term reliability while retaining structural stability.
Solution Approach 2:
The patent introduces intermediary layers (carbon-based coatings, polymer coatings, or bioactive glass coatings) between the silicon substrate and the neural tissue. These intermediary layers act as mediators that prevent direct interaction between the silicon and biological tissues, reducing foreign body response and gliosis while maintaining the structural benefits of silicon.
3Manufacturing precision
If conventional manufacturing processes are used for INIs, then manufacturing precision is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent employs disposable photomaskless direct laser writing technology for fabricating carbon-based electrode patterns directly on substrates. This eliminates the need for expensive, complex photolithography processes including photomask fabrication, photoresist coating, and etching steps, significantly reducing manufacturing complexity and cost while maintaining sufficient precision for neural interface applications.
Solution Approach 2:
The patent replaces traditional mechanical and chemical manufacturing processes (photolithography, etching, deposition) with direct laser writing. This substitution uses laser energy to directly carbonize or pattern materials, eliminating multiple mechanical steps and chemical processing stages, thereby reducing device complexity and manufacturing cost while achieving required precision.
Data Source
AI summary
The present disclosure provides an electrode device and methods of making and using the same. The electrode device includes a base layer, an intermediate layer, and a capping layer. Both the intermediate layer and the capping layer are located over the base layer. The intermediate layer includes a carbon-based electrode. The base layer and the capping layer each include silicon carbide. The capping layer partially surrounds the carbon-based electrode. The method of using the electrode device as an implantable neural interface involves providing the electrode device, electrically coupling the carbon-based electrode to neural tissue of a patient, and electrically coupling the carbon-based electrode to at least one of recording electronics and stimulating electronics. The recording electronics are configured to electrically record neural signals from the neural tissue, whereas the stimulating electronics are configured to electrically stimulate the neural tissue.