Switchable Electrode Array for Neural Stimulation Resolution
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Solution Overview
Problem
Current electrode arrangements for stimulating and recording electrical signals in biological matter face challenges in achieving high resolution while avoiding tissue damage and electrode corrosion, particularly due to issues with charge density and overpotential.
Innovation Solution
An electrode arrangement with a switchable array of electrodes that can dynamically form combined macroelectrode sites, where perimeter and central electrodes receive different stimulation signals to control current density and prevent charge accumulation, allowing for localized and efficient stimulation and recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the surface area of stimulation electrodes is decreased to achieve high resolution, then the resolution of treatment and analysis is improved, but the charge density increases causing tissue damage and electrode corrosion
Solution Approach 1:
The patent divides a large stimulation electrode into multiple smaller microelectrodes arranged in an array. Each microelectrode can be independently controlled or grouped to form a combined stimulation site. This segmentation allows the system to achieve high spatial resolution while distributing the stimulation charge across multiple smaller electrodes, preventing excessive charge density at any single location and thereby avoiding tissue damage and electrode corrosion.
2Reliability
If the charge injected is increased to achieve effective stimulation, then the stimulation efficacy is improved, but the overpotential of the electrode increases causing tissue damage or electrode corrosion
Solution Approach 1:
The patent enables different charge densities to be applied to different regions of the electrode array. By selectively activating specific microelectrodes or groups of electrodes, the system can concentrate higher charge injection at target locations requiring strong stimulation while using lower charge densities at other locations. This localized control of charge injection achieves effective stimulation where needed while avoiding excessive overpotential and its harmful effects at other sites.
3Object-affected harmful factors
If a single large electrode is used for stimulation, then the charge delivery is sufficient to avoid tissue damage, but the resolution of treatment and recording is reduced
Solution Approach 1:
The patent segments a large electrode into multiple smaller microelectrodes that can function independently or in combination. When multiple microelectrodes are grouped together to form a combined stimulation site, they collectively provide sufficient charge delivery area to avoid tissue damage, similar to a large electrode. Simultaneously, the individual microelectrodes maintain high spatial resolution for both stimulation and recording, enabling precise localization of treatment and analysis.
Solution Approach 2:
The patent allows multiple small microelectrodes to be electrically connected and function as a single combined electrode site. By merging the functional output of multiple microelectrodes, the system achieves the charge delivery capacity of a large electrode while retaining the resolution benefits of individual microelectrodes. The combined site provides sufficient surface area for safe charge injection while the modular structure maintains high spatial precision.
Data Source
Figure 1A~1B
Figure 2~2(f)
Figure 3~4
AI summary
An electrode arrangement for stimulating and recording electrical signals in biological matter comprises: an array (110) of electrodes (112), wherein electrodes (112) are configured to be switchable between stimulating and recording of electrical signals; a control unit (120), wherein the control unit (120) is configured to select a plurality of electrodes (112) to form a combined macroelectrode site (114) for providing a stimulating signal, wherein the control unit (120) is further configured to determine a perimeter electrode (112b) and a central electrode (112a), wherein the perimeter electrode (112b) is arranged at a perimeter of the combined macroelectrode site (114) and the central electrode (112a) is arranged centrally within the combined macroelectrode site (114), and wherein the control unit (120) is further configured to provide a stimulation signal to the perimeter electrode (112b) that has a lower magnitude than a stimulation signal provided to the central electrode (112a).