Flexible Microelectrode Array for Stable Long-Term Neural Recording

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Implantable microelectrodes tend to migrate within soft tissue, causing damage and impairing signal recording due to their stiffness and size, which triggers glial responses and encapsulation, making long-term neural studies challenging.

Innovation Solution

A microelectrode array with flexible, oblong microelectrodes connected by biodegradable microfibers and expandable biocompatible glue, allowing mechanical adaptation to tissue and maintaining positional stability, while using a control unit for signal analysis and neuron identification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If microelectrodes are made stiff and firmly bundled to ensure structural integrity, then manufacturing precision is improved, but positional stability in soft tissue deteriorates due to migration and tissue irritation

Engineering Contradiction:

Improvestructural integrityVSAvoidpositional stability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent changes the mechanical parameters of the microelectrode array by using flexible individual electrodes instead of rigid bundled structures. Each microelectrode is made sufficiently flexible to move with brain tissue while maintaining electrical functionality, thereby resolving the contradiction between structural integrity and positional stability.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If microelectrode arrays are made larger to include more electrodes for precise neuron identification, then measurement precision is improved, but tissue damage worsens due to increased stiffness and glial encapsulation

Engineering Contradiction:

Improveneuron identification accuracyVSAvoidtissue damage

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent segments the microelectrode array into multiple independent flexible microelectrodes rather than a single rigid structure. This segmentation allows each electrode to move independently with tissue, reducing overall stiffness and glial response while maintaining the multi-electrode configuration needed for precise neuron identification through signal triangulation.

Inventive Principle:

Principle #1Segmentation

3Manufacturing precision

If microelectrodes are firmly bundled to maintain fixed geometry, then manufacturing precision is improved, but adaptability to tissue movement deteriorates

Engineering Contradiction:

Improveelectrode geometryVSAvoidmechanical adaptation to tissue

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent introduces dynamic flexibility into the microelectrode design, allowing each electrode to move and adapt to tissue dynamics while maintaining their relative geometric configuration for signal processing. The flexible electrodes can dynamically adjust to tissue movement rather than being constrained by rigid bundling.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3548139B1Microelectrode array comprising connecting microfibers

Publication Date: 2025.12.03 NEURONANO AB

Figure 1a~2b
Figure 1b~3b
Figure 2c~7c

AI summary

A microelectrode array comprises three or more flexible oblong, electrically co-operating microelectrodes in wire and/or ribbon form disposed substantially in parallel. The microelectrodes are electrically insulated except for at a distal section thereof. The array further comprises electrically non-conducting microfibres connecting central portions of the microelectrodes in oblique directions in respect of the array axis. In a preferred array variety the microelectrodes are joined by a glue that is dissolvable or degradable in aqueous body fluid. Also disclosed is a combination of two or more arrays of the invention.