Hybrid ECoG Intracortical Neural Interface for Stable Recording
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Solution Overview
Problem
Current neural interface systems for motor prosthetics face challenges in long-term functional stability, signal durability, and clinical adoption due to issues with intracortical electrodes, noise interference, and mechanical mismatch, leading to frequent device failures and neurosurgical complications.
Innovation Solution
An implantable device with a hermetic package, thin film electrode array, and inductive coil for wireless data transmission, designed for electrocorticographic and local field potential signal recording and stimulation, featuring a biocompatible substrate, flip-chip bonding, and wire bonding for secure electrode attachment, minimizing mechanical mismatch and enhancing long-term reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intracortical electrodes are used for high-resolution neural recording, then measurement precision is improved, but reliability deteriorates due to long-term functional instability and signal loss
Solution Approach 1:
The device segments the neural interface function into two distinct components: intracortical electrodes for high-precision signal acquisition and ECoG electrodes for stable long-term monitoring. This segmentation allows each component to optimize its specific function while mitigating the weaknesses of the other.
Solution Approach 2:
The patent introduces ECoG electrodes as an intermediary solution between intracortical electrodes and non-invasive EEG. The ECoG electrodes provide a stable interface that can transmit neural information over long periods without the signal degradation problems of intracortical electrodes, acting as a mediator that preserves signal reliability.
2Productivity
If intracortical electrodes are implanted for motor control recording, then productivity is improved through accurate BMI operation, but object-affected harmful factors increase due to surgical risk and device failure
Solution Approach 1:
The device incorporates redundant recording capabilities through both intracortical and ECoG electrodes, providing a backup system that cushions against the risk of intracortical electrode failure. This prior cushioning ensures continuous operational capability even if one electrode type fails.
Solution Approach 2:
The patent changes the recording parameters by utilizing both high-frequency intracortical signals for fine motor control and lower-frequency ECoG signals for stable baseline monitoring. This parameter diversification allows the system to maintain productivity through multiple signal acquisition modes.
3Reliability
If ECoG electrodes are used instead of intracortical electrodes, then reliability is improved through greater long-term stability, but measurement precision deteriorates due to lower spatial resolution
Solution Approach 1:
The patent merges the advantages of both ECoG and intracortical electrode systems into a single hybrid device. The ECoG portion provides stable long-term recording capability while the intracortical portion maintains high spatial resolution for detailed motor control signals.
Solution Approach 2:
The device achieves multi-functionality by incorporating both ECoG and intracortical recording capabilities in one implantable system. This universal design allows the device to perform both high-precision short-term monitoring and stable long-term recording, adapting to different clinical needs.
4Reliability
If hermetic package with flip-chip bonding is used for electrode attachment, then reliability is improved through secure attachment and reduced mechanical mismatch, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical wire bonding with flip-chip bonding technology, which uses controlled compression and thermal reflow processes instead of manual wire manipulation. This substitution improves attachment reliability while reducing the complexity of manual assembly operations.
Solution Approach 2:
The hermetic package incorporates gold-plated contacts and reflective surfaces that enhance electrical connectivity and signal quality. The metallic coatings provide both electrical functionality and visual identification during surgical implantation, reducing operational 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
The device provides stable neural recording and stimulation with reduced noise interference, improved signal durability, and enhanced biocompatibility, enabling reliable chronic use without the need for battery replacement or transcutaneous leads, thus addressing the limitations of existing systems.
Implementation Method 1
an implantable device with at least one package that houses electronics that sends and receives data or signals, and optionally power, from an external system through at least one coil attached to at least one package
Implementation Method 2
The passage of current causes changes in electrical potentials across neuronal membranes, which can initiate neuron action potentials, which are the means of information transfer in the nervous system.
Data Source
AI summary
The present invention consists of an implantable device with at least one package that houses electronics that sends and receives data or signals, and optionally power, from an external system through at least one coil attached to the at least one package and processes the data, including recordings of neural activity, and delivers electrical pulses to neural tissue through at least one array of multiple electrodes that is/are attached to the at least one package. The device is adapted to electrocorticographic (ECoG) and local field potential (LFP) signals. The output signals provide control for a motor prosthesis and the inputs signals provide sensory feedback for the motor prosthesis. The invention, or components thereof, is/are intended to be installed in the head, or on or in the cranium or on the dura, or on or in the brain.