Multiscale Brain Electrodes Nested Micro-Macro Recording
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Solution Overview
Problem
Current electrode technologies face challenges in effectively probing and recording the multiscale spatiotemporal dynamics of brain activity, particularly in accessing and mapping the brain's spatial scales from single neurons to large-scale networks, due to limitations in electrode design and functionality.
Innovation Solution
The development of multiscale electrodes comprising macroelectrodes and embedded microelectrodes, configured as strips, grids, or penetrating depth electrodes, which allow for simultaneous stimulation and recording across a wide range of spatial and temporal scales, enabling the detection of microscale EEGs and biomarkers like micro-seizures, high-frequency oscillations, and focal slow-wave oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If macroelectrodes are used for large-scale brain stimulation and recording, then the ability to deliver current safely to macroscopic brain tissue is improved, but the ability to record activity at micro-domain scales and deliver micro-stimulation to probe local neuronal assemblies deteriorates
Solution Approach 1:
The patent embeds multiple microelectrodes within each macroelectrode contact, creating a nested structure where microelectrodes (10-100 μm) are contained inside macroelectrodes (1-10 mm²). This allows the device to function at both macroscopic scales (for safe current delivery and LFP recording) and microscopic scales (for single-unit activity recording and micro-stimulation), resolving the contradiction between macroscopic recording capability and multiscale adaptability
2Measurement precision
If microelectrodes are used to record activity at micro-domain scales and deliver micro-stimulation, then the ability to probe local neuronal assemblies is improved, but the ability to safely deliver current to macroscopic brain regions and record large-scale networks deteriorates
Solution Approach 1:
Each macroelectrode contact contains multiple microelectrodes, allowing the system to switch between micro-scale recording (using individual microelectrodes for single-unit activity) and macro-scale stimulation (using the macroelectrode as a whole for safe current delivery to large brain regions). This nested architecture enables seamless transition between different operational modes and spatial scales
3Reliability
If separate macroelectrodes and microelectrodes are used for different scales, then the specialized functionality for each scale is improved, but the device complexity and the need for multiple electrode implants deteriorates
Solution Approach 1:
The patent combines macroelectrodes and microelectrodes into a single integrated device, where each macroelectrode contact contains multiple microelectrodes. This merging eliminates the need for separate macroelectrode and microelectrode implants, reducing surgical complexity and device count while maintaining specialized functionality for both macroscopic and microscopic recording and stimulation through the nested electrode architecture
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
These electrodes facilitate the identification of seizure loci and biomarker activity, allowing for real-time monitoring and adaptive therapeutic interventions, thereby improving the diagnosis and treatment of neurological and psychiatric disorders.
Implementation Method 1
the electrode surface area must be such that current can be safely delivered to the region and scale of interest and the brain response recorded
Data Source
AI summary
Multiscale brain electrodes can be used for spatiotemporal mapping, probing, and therapeutic modulation of the human brain. The applications for such functional mapping and electrical stimulation modulation span, for example, neurological and psychiatric diseases, and brain rehabilitation.