Hermetically Sealed 3D Electrode Array for Neural Interfaces
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Solution Overview
Problem
Existing electrode devices for neural interfaces face challenges in establishing stable, non-destructive electrical contact with multiple individual nerve fibers, as they often cause tissue damage during insertion and are prone to instability due to their bulk and design, limiting their ability to penetrate deeply and maintain long-term contact.
Innovation Solution
A hermetically sealed electrode array with a 'bed-of-nails' configuration, featuring an array of sharp, conductive needles arising from a substrate, coated with an insulating layer except for a revealed band or hole, allowing focused contact with single cells and minimizing tissue disruption, while being anchored by tissue ingrowth for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple needle electrodes are used to contact individual nerve fibers, then the ability to make electrical contact with multiple nerve fibers is improved, but the device complexity and difficulty of implantation increase
Solution Approach 1:
The device segments the electrode array into multiple independent needle electrodes arranged in a grid pattern on a flexible substrate. Each needle can independently contact individual nerve fibers, allowing simultaneous contact with multiple fibers while maintaining a relatively simple overall structure that can be implanted as a single unit.
Solution Approach 2:
The invention transitions from using multiple separate needle electrodes to a two-dimensional array of needles mounted on a flexible substrate. This dimensional arrangement allows multiple contact points to be delivered through a single insertion site, reducing implantation complexity while maintaining the ability to contact multiple nerve fibers simultaneously.
2Reliability
If needle electrodes are inserted into the nerve to contact individual nerve fibers, then electrical contact with nerve fibers is improved, but tissue damage increases and long-term stability deteriorates
Solution Approach 1:
The electrode array is segmented into multiple fine needle electrodes rather than using a single large electrode. This segmentation allows the device to contact individual nerve fibers with minimal disruption to surrounding tissue, reducing overall tissue damage while maintaining stable electrical contact.
Solution Approach 2:
The flexible substrate allows the needle array to conform to and move with the nerve tissue dynamically. This dynamic adaptation reduces mechanical stress and tissue damage during movement, while maintaining stable electrical contact between the needles and nerve fibers over the long term.
3Manufacturing precision
If a rigid electrode array is used to maintain structural integrity, then manufacturing precision is improved, but tissue damage during insertion increases
Solution Approach 1:
The electrode array is mounted on a flexible substrate rather than a rigid support structure. This flexible foundation maintains the precise geometric arrangement of the needle electrodes during manufacturing, while allowing the entire array to bend and conform to the nerve tissue during insertion and implantation, thereby reducing tissue damage.
Data Source
AI summary
The electrode array is a device for making electrical contacts with cellular tissue or organs. The electrode array includes an assembly of electrically conductive electrodes arising from a substrate where the electrodes are hermetically bonded to the substrate. The electrodes also include an insulating layer which leaves at least one zone or at least one hole exposed for making focused electrical contact with the tissue. A hole passing completely or partially through the electrode may further provide an anchor to the living tissue, thereby stabilizing the array with respect to the tissue being examined. Also, a method of manufacture of an electrode array and associated circuitry is disclosed.