Graphene Microwire Neural Electrode with Flexible Polymer Coating
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Solution Overview
Problem
Current neural electrodes, such as intrafascicular implants, face challenges with mechanical compatibility and longevity due to their size and compliance, leading to limited duration of implantation and low signal-to-noise ratios in recording neural activity.
Innovation Solution
The development of an intrafascicular neural electrode with a microwire body that matches the mechanical and biological properties of the target nerve, featuring a distal anchoring end with a spiral or helical shape to prevent pullout and minimize damage, and coated with biocompatible insulation materials to enhance integration and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional intrafascicular electrodes are used, then recording capability is achieved, but mechanical compatibility with nerve tissue deteriorates due to size and compliance mismatch
Solution Approach 1:
The patent employs a flexible polymer coating layer that envelops the microwire electrode, providing mechanical compliance matching with soft nerve tissue while maintaining electrical conductivity. This flexible shell allows the rigid micrawire to adapt to the deformable nerve environment, resolving the contradiction between structural integrity for recording and mechanical compatibility for long-term implantation.
Solution Approach 2:
The electrode structure combines multiple materials with complementary properties: a conductive micrawire core for electrical recording, a flexible polymer coating for mechanical compliance, and potentially biocompatible surface treatments. This composite structure integrates the strengths of different materials to simultaneously achieve recording capability and mechanical compatibility with nerve tissue.
2Reliability
If existing intrafascicular electrodes are implanted, then neural activity can be recorded, but longevity is limited due to foreign body reaction and mechanical stress
Solution Approach 1:
The flexible polymer coating acts as a protective barrier that reduces mechanical stress concentration at the electrode-nerve interface and minimizes foreign body reaction by providing a biocompatible surface. This protective shell enables chronic implantation by preventing tissue damage and reducing inflammatory response, thereby extending implantation duration while maintaining recording function.
Solution Approach 2:
The patent modifies physical parameters of the electrode including reducing micrawire diameter to minimize mechanical disruption, optimizing coating thickness to balance protection and signal transmission, and adjusting material properties to match nerve tissue characteristics. These parameter optimizations collectively enhance both recording reliability and long-term implantation durability.
3Ease of operation
If needle introducer is used for implantation, then insertion is facilitated, but complete withdrawal leaves anchoring portion inside fascicle
Solution Approach 1:
The electrode is divided into functional segments: a sharp needle portion for easy insertion through tissue, a micrawire recording portion, and a flexible anchoring portion with coating. This segmentation allows each part to perform its specific function optimally while simplifying the overall implantation process and reducing structural complexity through functional specialization.
Solution Approach 2:
The flexible polymer-coated anchoring portion serves as an intermediary element that remains implanted in the fascicle to secure the electrode while the external needle introducer is completely removed. This intermediary anchoring structure facilitates easy initial insertion while providing stable long-term retention, resolving the contradiction between insertion ease and structural simplicity.
Data Source
AI summary
One aspect of the present disclosure can include an intrafascicular neural electrode. The intrafascicular neural electrode can include a microwire body having a proximal end, a distal anchoring end, and a middle portion extending between the proximal end and the distal anchoring end. The distal anchoring end can substantially match the mechanical and biological properties of the target nerve. The microwire body can have a middle anchoring portion extending between the proximal end and the distal end, wherein at least a portion of the distal end and/or the middle anchoring portion substantially match(es) the mechanical and biological properties of the target nerve. The electrode can be made of graphene. The microwire body, except for the distal anchoring end, can be coated with an insulation material, preferably with a biocompatible agent adsorbed onto the insulation material.