3D Nerve Implant with Ground Plane for Spatial Selectivity
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Solution Overview
Problem
Existing nerve stimulation implants face challenges in achieving high spatial selectivity and minimizing tissue damage due to insufficient localization of electrical stimulation, often requiring higher current intensities that exceed safety thresholds and necessitating a large number of electrodes for improved resolution.
Innovation Solution
A three-dimensional implant configuration with an electrically insulating substrate, an array of cavities, stimulation electrodes at the bottom of each cavity, and an electrically conductive ground plane on the upper surface, which focuses electrical stimulation within the cavities, reducing current amplitude and allowing for independent control of stimulation units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If monopolar configuration is used, then current flows between stimulation electrode and remote return electrode, but spatial selectivity of electrical stimulation is poor
Solution Approach 1:
The implant is divided into multiple independent stimulation units, each with its own electrodes positioned at different depths. This segmentation allows each unit to independently stimulate specific nerve fibers at targeted depths while minimizing cross-talk between adjacent units, thereby improving spatial selectivity without requiring higher current amplitudes.
Solution Approach 2:
The patent transitions from a two-dimensional planar electrode array to a three-dimensional configuration with electrodes positioned at varying depths within the implant. This depth dimension enables selective stimulation of nerve fibers at specific depths by activating only the relevant stimulation units, significantly improving spatial selectivity while maintaining low current amplitudes.
2Measurement precision
If bipolar configuration is used, then localization of electrical stimulation is improved, but spatial selectivity may still be insufficient for certain applications
Solution Approach 1:
The implant is segmented into multiple stimulation units that share a common return electrode. Each unit has its own stimulation electrodes but uses the same ground plane, which divides the internal wiring by two compared to fully independent bipolar configurations. This segmentation maintains improved localization while reducing wiring complexity.
Solution Approach 2:
The common ground plane serves as a universal return electrode for all stimulation units simultaneously. This multi-functional design allows each unit to perform bipolar stimulation with shared infrastructure, maintaining precise localization capability while significantly simplifying the internal wiring architecture.
3Reliability
If current intensity is increased to obtain response in targeted neurons, then stimulation effect is improved, but safety thresholds for tissues are exceeded
Solution Approach 1:
Different stimulation units are positioned at specific depths to target different nerve fiber populations. Each unit delivers current locally to its intended target, creating a highly focused electric field that concentrates stimulation effect where needed while minimizing current spread to surrounding tissues, thereby improving reliability without exceeding safety thresholds.
Solution Approach 2:
The three-dimensional arrangement of stimulation units at varying depths creates depth-selective stimulation. By activating only the units at the appropriate depth, the electric field is confined to the target nerve fibers at that depth, intensifying the local stimulation effect while reducing overall current requirements and preventing tissue damage from excessive current spread.
4Measurement precision
If number of electrodes is multiplied to increase spatial resolution, then spatial resolution is improved, but device complexity increases
Solution Approach 1:
The implant is segmented into multiple stimulation units with shared infrastructure. Each unit contains stimulation electrodes for spatially selective addressing, while the common ground plane serves all units. This segmentation enables high spatial resolution through multiple independently addressable units without proportionally increasing overall device complexity.
Solution Approach 2:
The common ground plane performs the function of return electrode for all stimulation units simultaneously. This universal component allows multiple electrodes to be deployed for high spatial resolution while sharing the ground connection infrastructure, thereby increasing spatial resolution capability without linearly increasing device complexity.
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 configuration achieves high spatial selectivity, minimizing tissue damage and enabling a higher density of stimulation units while maintaining safe current levels, optimizing the distribution of electrical stimulation for targeted nerve structures.
Implementation Method 1
an electrically conductive layer forming a ground plane at an upper portion of the cavities
Implementation Method 2
The three-dimensional configuration of the implant with a ground plane makes it possible to focus the electrical stimulation of the target cells inside the cavity
Data Source
AI summary
The invention relates to an implant which includes, in order to electrically stimulate a nerve structure, in particular the retina, an electrically insulating substrate (1), a array of recesses (2) formed in an upper surface of the substrate, stimulation electrodes (3) arranged at the bottom of the recesses, and an electrically conductive layer forming a ground plane (4) at the upper portion of the recesses. The sizes of the recesses and of the electrodes of the implant are such that the spatial selectivity of the stimulation current applied to the nerve structure is maximized.