Microelectrode Array With Segmented Return Surface
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Solution Overview
Problem
Existing microelectrode arrays face challenges in achieving focal stimulation of living tissue, with monopolar and bipolar stimulations being inefficient due to non-homogeneous potential distribution and the need for higher currents, and existing solutions either double the number of electrodes or create blind zones where neurons are not stimulated.
Innovation Solution
A matrix of microelectrodes arranged in a specific configuration with an additional conductive surface that provides focal stimulation by connecting conductive zones around each microelectrode, allowing for efficient current return and homogeneous stimulation without duplicating electrodes, using a grid or surface with high interface conductivity to focus the stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If monopolar stimulation is used with a remote mass electrode, then the stimulation can be applied to living tissue, but the potential distribution is non-homogeneous and current requirements are increased
Solution Approach 1:
The remote mass electrode is segmented into multiple discrete return electrodes positioned around the stimulation electrode. This segmentation allows the return current to be distributed across multiple localized paths, creating a more homogeneous potential distribution while reducing the total current requirement compared to a single remote mass electrode.
Solution Approach 2:
The invention transitions from a monopolar configuration (single stimulation electrode, remote return) to a multipolar configuration where return electrodes are positioned in the same spatial plane as the stimulation electrode. This dimensional change in electrode arrangement optimizes the current distribution and creates a more focused, homogeneous stimulation field.
2Manufacturing precision
If bipolar stimulation is used with two stimulation microelectrodes, then focal stimulation can be achieved, but blind zones are created where neurons close to the electrodes are not excited
Solution Approach 1:
The stimulation function is segmented across multiple electrodes arranged in a ring configuration around the central stimulation electrode. This segmentation allows current to be delivered through multiple pathways simultaneously, eliminating blind zones by ensuring continuous current flow around the entire perimeter of the stimulation site.
Solution Approach 2:
Multiple return electrodes positioned around the stimulation electrode are electrically combined to form a unified return path. This merging of return electrodes creates a continuous current distribution that eliminates the blind zones present in bipolar stimulation, while maintaining focal stimulation characteristics.
3Manufacturing precision
If groups of electrodes are used for each stimulation site, then more homogeneous potential distribution is obtained, but the number of electrodes is doubled and device complexity increases
Solution Approach 1:
The ring of return electrodes serves multiple functions: it provides the return path for current injected by the central stimulation electrode, creates a homogeneous potential distribution, and can independently stimulate neurons in different orientations. This multi-functionality eliminates the need to double the number of electrodes while achieving homogeneous potential distribution.
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 solution enables focal and spatially homogeneous stimulation of living tissue with reduced current requirements and eliminates the need for multiple electrodes, improving stimulation focus and efficiency while maintaining amplitude.
Implementation Method 1
comprises a plurality of conductive zones located respectively in the vicinity of a determined plurality of sections local application of microelectrodes of the matrix, connection means being provided to ensure an electrical connection between the conductive areas
Implementation Method 2
using a grid or surface with high interface conductivity to focus the stimulation
Data Source
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AI summary
The invention relates to a device for stimulating living tissue, comprising an array (1) of stimulating microelectrodes (11) that are placed in a defined configuration side by side and able to be selected by applying an electrical signal for stimulation by one of the microelectrodes. According to the invention, an additional conducting surface (3) for application against the living tissue, is provided in the vicinity of a defined plurality of sections (210) for local application of microelectrodes (11), connecting means (32) being provided for electrical connection between the zones (31), and the additional conducting surface (3) being also connected to a lead (33) and being formed so as to ensure local stimulation via a microelectrode (11).