Flexible Micro-Electrode Array with Distributed Electrodes
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Solution Overview
Problem
Existing micro-electrode arrays cause tissue damage and are difficult and expensive to assemble, with concentric metallizations leading to high capacitance and signal interference when measuring neural activity.
Innovation Solution
A micro-electrode array with a flexible substrate and cylindrical core featuring multiple, spatially distributed electrode surfaces connected to narrow measurement lines, which reduce capacitance and allow for improved signal differentiation, along with the use of field effect transistors for sensitive signal detection and directional light sources for precise neural stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If concentric metallization layers are used for electrode coating, then electrical conductivity is improved, but capacitance increases and signal interference occurs
Solution Approach 1:
The patent divides the continuous concentric metallization into discrete, spatially distributed electrode surfaces arranged in a matrix pattern around the core. This segmentation reduces the total capacitive coupling area while maintaining electrical conductivity at each electrode site, thereby reducing overall capacitance and signal interference.
Solution Approach 2:
The patent applies metallization locally only where electrode surfaces are needed around the core periphery, rather than coating the entire core surface uniformly. This localized metallization approach maintains necessary electrical conductivity at electrode sites while minimizing unnecessary capacitive areas that cause signal interference.
2Reliability
If micro-electrode arrays are assembled using conventional methods, then electrode functionality is achieved, but assembly complexity and cost increase
Solution Approach 1:
The patent combines multiple functions into a single integrated structure: the core serves as both the optical waveguide and the mechanical support for the electrode array. The electrode surfaces are directly formed on the core periphery, eliminating the need for separate assembly steps for mounting electrodes to the core, thereby reducing assembly complexity and cost.
Solution Approach 2:
The core structure serves multiple functions simultaneously: it acts as the optical waveguide for light delivery, provides the mechanical support structure for the electrode array, and serves as the substrate for forming the electrode surfaces. This multi-functionality reduces the number of separate components and simplifies the overall assembly process.
3Measurement precision
If electrode tips are inserted into tissue, then neural activity measurement is enabled, but tissue damage occurs and neural activity declines
Solution Approach 1:
The patent distributes multiple small electrode surfaces around the core periphery rather than using a single large electrode tip. This segmentation allows the electrode array to measure neural activity from multiple spatial locations simultaneously, enabling accurate measurement while distributing the mechanical stress across multiple contact points, thereby reducing localized tissue damage.
Solution Approach 2:
The patent transitions from a single-point electrode tip measurement to a distributed array of electrode surfaces arranged in a spatial matrix around the core. This dimensional change from 0D (point) to 2D (distributed surfaces) enables measurement of neural activity from multiple spatial locations, improving measurement precision while reducing the depth of penetration required and thereby reducing tissue damage.
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
The design minimizes tissue damage, reduces signal interference, and enables more accurate and sensitive measurement and stimulation of neural activity, facilitating better brain-computer interfaces and patient interaction.
Implementation Method 1
a plurality of measurement lines 9 that are electrically insulated from one another are arranged around the core... electrically conductively connected to an associated measurement line
Implementation Method 2
an optical waveguide formed from a central shaft... the core... for optical stimulation
Data Source
AI summary
A micro-electrode array (1) comprising a flexible substrate (2) and a multiplicity of electrodes (3) for electrically measuring neural activity is described. The electrodes (3) are arranged on the substrate (2), project from the plane of the substrate (2) and have a core (4). A plurality of measurement lines (9) that are electrically insulated from one another are arranged around the core (4). Adjacent to the end surface (7) of the core (4), at the end of the electrodes (3) there are a plurality of electrode surfaces (8) arranged in a manner distributed spatially around the end surface (7), said electrode surfaces in each case being electrically conductively connected to an associated measurement line (9). The micro-electrode array (1) is passivated with a polymer-containing material, such as e.g. polyimide, such that only the electrodes (3) electrically contact neural tissue with their electrode surfaces (8, E1, E2).