Annular Electrode Array for Stable Nerve Interface
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Solution Overview
Problem
Current electrode arrays for nerve stimulation and recording, such as microelectrode arrays and sieve electrodes, face issues like mechanical damage, inflammatory responses, and instability due to rigidity and foreign body reactions, leading to signal loss and dislodgment, and lack a reliable long-term biocompatible interface for neural control of bionic devices.
Innovation Solution
A three-dimensional annular electrode array designed with FDA-approved biocompatible materials and insulated microwires, specifically carbon nanotube yarn, that securely attaches to nerve stumps, allowing axon regeneration and minimizing mechanical damage, with electrode terminals captured by regenerating nerve axons, providing a stable interface for both motor and sensory signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If penetrating microelectrode arrays are implanted into nerve tissue, then electrode contact with nerve fibers is achieved, but mechanical damage, cell death, and inflammatory responses occur
Solution Approach 1:
The patent introduces a flexible polymer sleeve as an intermediary component between the electrode array and nerve tissue. The sleeve acts as a mediator that allows nerve fibers to regenerate through its porous structure without direct penetration, thereby eliminating mechanical damage and inflammatory responses while maintaining stable electrode contact. The sleeve material serves as a biocompatible interface that prevents foreign body reactions.
Solution Approach 2:
The flexible polymer sleeve is constructed with a porous structure that enables nerve fibers to regenerate through and anchor to the sleeve material. This porous configuration allows the nerve tissue to integrate with the implant without requiring penetrating electrodes, thus avoiding mechanical damage while maintaining electrical contact for reliable signal detection and stimulation.
2Stability of the object's composition
If rigid electrode arrays are used to maintain position, then structural stability is improved, but nerve movement causes extraction and dislodgment
Solution Approach 1:
The patent employs a flexible polymer sleeve that can deform and move with the nerve tissue while maintaining the structural integrity of the electrode array. This flexible shell allows the nerve to move without exerting extraction forces on the electrodes, preventing dislodgment while preserving position stability through the sleeve's confining structure.
Solution Approach 2:
The electrode array system is designed to be dynamic rather than static, allowing the flexible polymer sleeve to move and adapt with nerve tissue deformation. This dynamic configuration enables the array to maintain contact with moving nerve fibers without rigid constraints that would cause extraction or dislodgment during nerve movement.
3Stability of the object's composition
If electrode arrays are anchored to nerve surface, then position is secured, but maximum size is limited by cylindrical geometry
Solution Approach 1:
The patent transitions from two-dimensional surface anchoring to three-dimensional integration within the flexible polymer sleeve. The electrode array is positioned within the sleeve's volumetric space, allowing larger array sizes that can be anchored through the sleeve's porous structure rather than limited by surface area on a cylindrical nerve. This dimensional change enables expanded electrode coverage while maintaining stable positioning.
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 a high-resolution, stable, long-term interface between biological and electromechanical systems, reducing surgical risks, preventing tissue damage, and maintaining electrode contact, while allowing for signal sampling and updating without disturbing the nerve-electrode connection.
Implementation Method 1
insulated microwires, specifically carbon nanotube yarn
Data Source
AI summary
A three-dimensional annular electrode array (AEA) device is disclosed for use as a cybernetic neural interface for the neural control and sensory feedback of a bionic prosthetic device. The AEA, designed for implantation into a nerve, is comprised of a body (6) that can be coupled to a sleeve(s) (9, 10) or a sleeve(s) with a compartmentalized inner core (12) for connection to the proximal and distal ends of a transected nerve, respectively. Regenerating nerve axons capture and sequester laterally projecting electrode terminals (4) arranged in radiating clusters (5) of a plurality of electrode sub-array nodes (2) that make up the array; connected by a primary electrode lead (7) to a connector contact array (3) in a plurality of connectors (1) for connection to wired or wireless electromechanical systems.