Flexible ECoG Arrays for Brain Surface Contouring
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Solution Overview
Problem
Current electrocorticography (ECoG) techniques face challenges in obtaining clear neural signals without interference and in providing adequate access for surgeons during medical procedures, such as epilepsy surgery, due to rigid electrode arrays that require significant pressure for contact and limited contour adaptation to the brain surface.
Innovation Solution
The development of flexible ECoG arrays with adaptable substrates and sensors that contour the brain surface, allowing for simultaneous recording and stimulation, and wireless communication to transmit neural signals, enabling real-time monitoring and minimizing signal noise while allowing for precise access and tailored feedback during procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid electrode arrays are used for ECoG recording, then structural stability is improved, but contact pressure requirements increase and contour adaptation to brain surface deteriorates
Solution Approach 1:
The patent applies flexible substrates (e.g., polyimide, parylene) as thin films to support the electrode array, allowing the rigid electrodes to conform to the curved brain surface while maintaining structural integrity. This resolves the contradiction by enabling contour adaptation through the flexible substrate without compromising the structural stability of the electrode elements themselves.
Solution Approach 2:
The patent introduces dynamic elements such as flexible connectors and adaptable mounting mechanisms that allow the electrode array to adjust its configuration during implantation and recording. This enables the array to adapt to different brain surface contours while maintaining stable electrical contacts, resolving the contradiction between structural stability and contour adaptation.
2Manufacturing precision
If rigid electrode arrays are used for ECoG recording, then manufacturing precision is improved, but surgical access during procedures deteriorates
Solution Approach 1:
The patent divides the electrode array into modular segments or strips that can be independently positioned and secured on the brain surface. This segmentation allows surgeons to access different regions of the brain while maintaining precise electrode placement, resolving the contradiction between manufacturing precision and surgical access.
Solution Approach 2:
The flexible substrate allows the precisely manufactured electrode array to be conformally wrapped around brain structures, enabling surgical access to areas that would be obscured by a rigid structure. This maintains manufacturing precision while improving ease of surgical operation.
3Measurement precision
If pressure is applied to ensure electrode contact with brain surface, then signal recording quality is improved, but tissue damage risk increases
Solution Approach 1:
The flexible substrate distributes contact pressure uniformly across the brain surface, eliminating the need for concentrated pressure to ensure electrode contact. This maintains high signal recording quality while minimizing the risk of tissue damage, resolving the contradiction between measurement precision and harmful effects.
Solution Approach 2:
The patent replaces mechanical pressure-based contact assurance with electrostatic or adhesive bonding mechanisms that secure the flexible electrode array to the brain surface without requiring sustained pressure. This eliminates tissue damage risk while maintaining excellent signal recording quality.
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 arrays provide clear, low-noise neural signal recordings with reduced pressure requirements, enabling precise identification of brain tissue responses and real-time monitoring during surgeries, enhancing the accuracy of epilepsy intervention and brain tumor procedures.
Implementation Method 1
The substrate may be flexible and may be configured such that electrodes or other sensors supported by the substrate may contour a target testing area of a brain of a patient
Implementation Method 2
employing active electrodes or other sensors positioned adjacent to brain matter in order to discern neural signals of the cerebral cortex or other neural sources
Data Source
AI summary
ElectroCorticoGraphy (ECoG) sensors and uses are disclosed. These ECoG arrays, systems, and processes may be operable or configured to: i) simultaneously record neural signals while providing stimulation on specific portions of the cortex using a user-guided stimulator; ii) acquire neural signals over a large cortex area; iii) provide individual or group stimulation while concurrently receiving neural feedback; and/or iv) acquire neural signals at a setting remote from the neural source using wireless or other communication techniques.