3D Printed Microelectrode Array for High-Throughput Electrophysiology
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Solution Overview
Problem
Conventional high-throughput microelectrode arrays with 2D substrates are inadequate for capturing physiologically relevant signals in three-dimensional microphysiological systems due to low Signal to Noise Ratio (SNR) and poor tissue interface, and existing manufacturing techniques are costly and complex for producing 3D configurations.
Innovation Solution
A 3D printed microelectrode array with a bifacial configuration, featuring 3D printed culture wells and conductive traces, where microchannels on the top face are filled with conductive paste to form self-isolated microelectrodes, and conductive traces are printed on the bottom face, enabling high-throughput electrophysiological measurements without the need for insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 2D planar microelectrodes are used in conventional high-throughput microelectrode arrays, then manufacturing is simpler and cost-effective, but the Signal to Noise Ratio is low and the interface with 3D tissue architecture is poor
Solution Approach 1:
The patent transitions from 2D planar microelectrodes to 3D vertically-oriented microelectrodes. The microelectrodes extend vertically through the substrate at multiple depths, enabling three-dimensional electrical stimulation and recording that matches the spatial architecture of 3D tissue models, thereby improving signal quality and tissue interface without requiring complex multi-layer assembly
2Reliability
If 3D microelectrode configurations are implemented to improve tissue interface, then electrophysiological signal quality improves, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The patent combines multiple functional elements into a single monolithic substrate: the 3D microelectrode array, insulation structures, and electrical interconnections are all integrated into one piece using additive manufacturing. This eliminates the need for complex multi-step assembly processes required by conventional 3D electrode approaches, maintaining manufacturability while achieving superior electrophysiological signal quality
Solution Approach 2:
The patent uses additive manufacturing technology to enable complex 3D geometries that would be difficult or expensive to produce using conventional subtractive or lamination methods. The layer-by-layer deposition process allows for cost-effective production of vertically-oriented microelectrodes with precise spatial control, improving signal quality without proportionally increasing manufacturing cost
3Manufacturing precision
If standard silicon or glass wafer-based manufacturing is used for bio plates, then manufacturing precision is high, but the awkward geometry requires multiple levels of assembly increasing device complexity
Solution Approach 1:
The patent divides the bio plate into modular standard format configurations (e.g., 6-well, 12-well, 24-well plates) that are compatible with existing high-throughput equipment. Each module maintains precise electrode positioning through additive manufacturing while the overall plate geometry conforms to standard specifications, eliminating the need for complex custom assembly of multiple components
Solution Approach 2:
The patent designs the microelectrode array substrate to serve multiple functions simultaneously: it provides the structural platform for cell culture, contains the 3D microelectrode array for electrical recording, provides insulation between electrodes, and includes integrated interconnection structures. This multi-functionality in a single component reduces assembly complexity while maintaining manufacturing precision through additive manufacturing
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 provides a cost-effective, high-throughput, and accurate method for electrophysiological measurements, capable of handling multiple well configurations, and integrates well with standard assay equipment, improving the monitoring and control of electro-active tissue.
Implementation Method 1
A conductive paste fills the microtroughs and the microchannels and forms a plurality of self-isolated microelectrodes in each culture well and conductive traces that communicate with the plurality of self-isolated microelectrodes
Data Source
AI summary
A high-throughput, three-dimensional microelectrode array for in vitro electrophysiological applications includes a 3D printed well plate having a top face and bottom face, and a plurality of culture wells formed on the top face of the well plate. Each culture well includes a plurality of vertical microchannels on the top face and microtroughs formed on the bottom face and communicating with the microchannels. A conductive paste fills the microtroughs and the microchannels and forms self-isolated microelectrodes in each culture well and conductive traces that communicate with the self-isolated microelectrodes.