Subdural Microelectrode Arrays for Precise Neural Stimulation
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Solution Overview
Problem
Current neurological stimulation and recording technologies face challenges with large, metallic electrodes that are inefficient for precise stimulation and recording of small brain targets due to their size and placement on the dura mater, leading to ineffective charge transfer and low signal-to-noise ratios, requiring complex and risky surgical procedures with high costs and risks of infection.
Innovation Solution
The development of subdural penetrating microelectrode arrays with multiple microelectrode elements that can be implanted near the cortical surface, allowing for localized stimulation and recording, and a control circuitry system to manage signal application and data transmission, enabling precise targeting and reduced surgical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large metallic electrodes (e.g., 3 mm in diameter) are used for cortical stimulation, then the electrode structure is simple and easy to manufacture, but the stimulation precision and recording accuracy deteriorate because the large size prevents specific targeting of small brain structures
Solution Approach 1:
The patent divides a single large electrode into multiple small microelectrode elements (e.g., 50-500 micrometers in diameter) arranged in arrays. This segmentation enables precise targeting of small brain structures while maintaining manufacturing feasibility through standardized microfabrication processes for each element.
Solution Approach 2:
The patent transitions from two-dimensional electrode surfaces to three-dimensional configurations by arranging microelectrode elements in arrays with specific spacing and patterns, enabling volumetric coverage and multi-point stimulation/recording that cannot be achieved with flat large electrodes.
2Ease of operation
If electrodes are placed on the dura mater (epidural placement), then the surgical procedure is simpler, but the charge transfer efficiency and signal-to-noise ratio deteriorate due to the electrically insulating property of dura mater
Solution Approach 1:
The patent extracts the electrodes from the epidural space and places them directly on the cortical surface (subdural placement), removing the dura mater barrier that causes electrical insulation. This enables direct contact between electrodes and neural tissue, dramatically improving charge transfer efficiency and signal quality.
3Device complexity
If large electrodes are used for cortical stimulation, then the device complexity is reduced, but the surgical risk and infection probability increase due to larger craniotomy requirements
Solution Approach 1:
The patent segments the electrode system into multiple small elements that can be placed through smaller surgical openings, reducing the size of required craniotomies and associated surgical risks while achieving the same or better therapeutic effect through distributed microelectrode arrays.
4Ease of manufacture
If large electrodes are used for stimulation, then the manufacturing cost is lower, but the therapeutic efficacy deteriorates because the electric field does not concentrate on the intended target
Solution Approach 1:
The patent applies local quality by making each microelectrode element small (50-500 micrometers) to concentrate the electric field locally at the target site, while the overall array can be manufactured using standardized processes. This local concentration of electrical energy dramatically improves stimulation efficacy for specific brain regions.
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 approach allows for highly localized and efficient neural stimulation and recording, reducing surgical risks and costs by improving precision and efficacy in targeting small brain areas, enabling more accurate diagnostic and therapeutic interventions.
Implementation Method 1
conductive electrodes are placed in contact with certain cortical brain structures in order to treat certain neurological conditions
Data Source
AI summary
Described herein are microelectrode array devices, and methods of fabrication and use of the same, to provide highly localized and efficient electrical stimulation of a neurological target. The device includes multiple microelectrode elements arranged along an supportive backing layer. The microelectrode elements are dimensioned and shaped so as to target individual neurons, groups of neurons, and neural tissue as may be located in an animal nervous system, such as along a region of a cortex of a human brain. Beneficially, the neurological probe can be used to facilitate location of the neurological target and remain implanted for long-term monitoring and/or stimulation.