Neural Interface with Flexible Polymer Substrate

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Solution Overview

Problem

Traditional ECoG electrode grids face complications such as hemorrhage, infection, and infarction due to their invasive nature and material limitations, necessitating improved designs for long-term neural activity recordings.

Innovation Solution

A neural interface system comprising an intracranial electrode grid integrated with a subcutaneous microelectronic signal processing unit and a wired connector, utilizing a flexible, biocompatible polymer substrate like parylene with a moisture barrier and ion barrier for reduced complications and enhanced durability, allowing for high-resolution neural activity detection and processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional PDMS-based ECoG electrode grids are used, then the grid can be implanted invasively to detect neural activity, but the grid suffers from hemorrhage, infection, and infarction complications due to material limitations and invasive nature

Engineering Contradiction:

Improvereliability of neural activity detectionVSAvoidhemorrhage, infection, and infarction complications

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs a composite structure combining a flexible polymer substrate (such as parylene) with an array of electrodes and integrated signal processing electronics. This composite material approach provides both mechanical flexibility for conformal brain surface attachment and electrical functionality for neural signal detection, while the biocompatible polymer reduces infection and inflammatory complications compared to traditional rigid PDMS grids

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes a flexible polymer substrate that forms a thin film structure, allowing the electrode grid to conform to the curved surface of the brain without causing mechanical damage. This flexible thin film design reduces tethering forces and minimizes the risk of hemorrhage and infarction compared to rigid traditional grids, while maintaining long-term stability for chronic recordings

Inventive Principle:

Principle #30Flexible shells and thin films

2Measurement precision

If large area, high-resolution ECoG electrode grids are developed for BMI applications, then neural signal information can be obtained for brain-machine interfaces, but the grid complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveneural signal detection resolutionVSAvoidgrid structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent divides the large-area electrode grid into multiple modular segments or modules, each containing a subset of electrodes and associated signal processing circuitry. This segmentation allows for simplified manufacturing of individual modules that can be assembled into a complete high-resolution grid, reducing overall manufacturing complexity while maintaining high measurement precision through the dense electrode array

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent integrates signal processing electronics directly onto the flexible polymer substrate alongside the electrode array, merging detection and processing functions into a single unified device. This integration reduces the need for separate external wiring and processing units, simplifying the overall system complexity while enabling high-resolution neural signal acquisition across large brain areas

Inventive Principle:

Principle #5Merging (Combining)

3Duration of action of stationary object

If traditional invasive ECoG grids are implanted, then neural activity can be detected, but the grids are subject to tethering forces and infection risks during chronic implantation

Engineering Contradiction:

Improveduration of neural activity recordingVSAvoidtethering forces and infection risks

Core Design Contradiction:

Duration of action of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The flexible polymer substrate allows the electrode grid to move with the brain surface without creating excessive tethering forces, as the material can stretch and conform to physiological movements. This flexibility enables chronic implantation for extended recording durations while minimizing mechanical damage and infection risks associated with rigid fixed structures

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The biocompatible polymer material creates an inert, non-reactive interface between the implant and the biological environment, reducing inflammatory responses and infection risks. This chemically inert environment allows for long-term chronic implantation without the complications of tissue rejection or infection that plague traditional non-biocompatible electrode grids

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Data Source

PatentUS10058263B2Neural interface

Publication Date: 2018.08.28 UNIV OF UTAH RES FOUND

AI summary

Technology for a neural interface is described. The neural interface can include an intracranial electrode grid operable to detect neural activity. The neural interface can include a subcutaneous microelectronic signal processing unit operable to process the neural activity in order to obtain digital neural activity information. The neural interface can include a cable connecting the intracranial electrode grid and the subcutaneous microelectronic signal processing unit. The neural interface can include a wired connector attached to the subcutaneous microelectronic signal processing unit that is operable to transmit the digital neural activity information from the subcutaneous microelectronic signal processing unit to an external signal processing device.