3D Printed Microelectrode Array with Integrated Microchamber
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Solution Overview
Problem
Current microelectrode array devices lack a controlled microenvironment for studying organoids, which are 3D dimensional cell constructs, and struggle with integrating oxygenation and sensing/stimulus systems effectively, limiting their ability to mimic in-vivo conditions for drug testing and personalized medicine applications.
Innovation Solution
A three-dimensional microchannel-based microelectrode array device with a base substrate, microchambers, and microconduits filled with liquid metal, featuring a multilevel configuration and double-metallization for enhanced sensing capabilities, allowing for precise control of fluid and gas exchange, and integration of organoids within the microchambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional microelectrode array devices are used, then device simplicity is maintained, but the ability to provide controlled microenvironment for organoid studies is insufficient
Solution Approach 1:
The device is segmented into distinct functional modules: microchambers for organoid cultivation, microconduits for fluid/gas delivery, and microelectrode arrays for sensing. This segmentation allows each component to be optimized independently while collectively providing a controlled microenvironment, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent merges multiple functions into a single integrated platform: organoid cultivation, oxygenation control, electrophysiological sensing, and stimulus delivery. This consolidation creates a comprehensive controlled microenvironment system that enhances adaptability without proportionally increasing overall device complexity.
2Adaptability or versatility
If microelectrode array devices integrate sensing systems, then sensing capability is improved, but integration with oxygenation and stimulus systems remains insufficient
Solution Approach 1:
The microelectrode array serves multiple functions: electrical sensing of organoid activity, electrical stimulus delivery, and potential electrochemical sensing of metabolites. This multi-functionality enhances the device's adaptability for electrophysiological studies while managing integration complexity through shared infrastructure.
Solution Approach 2:
The device employs a nested structure where microelectrodes are positioned within or adjacent to microchambers, which are themselves integrated with microconduit networks. This nesting allows sensing, oxygenation, and stimulus systems to be tightly coupled at multiple scales, improving integration efficiency.
3Reliability
If 3D organoid structures are studied, then physiological relevance is improved, but lack of controlled microenvironment limits in-vivo condition mimicry
Solution Approach 1:
The device uses microfluidic hydraulics to deliver oxygen, nutrients, and drugs to organoids through controlled flow through microconduits. This hydraulic control system enables precise regulation of the microenvironment, improving in-vivo condition mimicry while managing complexity through standardized microfluidic components.
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 device provides a controlled microenvironment for electrophysiological studies, enabling effective oxygenation and multi-modal sensing, thereby improving the accuracy of drug testing and personalized medicine applications by closely mimicking in-vivo conditions.
Implementation Method 1
A liquid metal, such as Galinstan, Gallium, Eutectic Gallium-Indium (EGaIn) and Mercury fills the microconduits to form an array of microelectrodes
Implementation Method 2
Each of the first plurality of microconduits may comprise a first set of ports on the top face outside the at least one microchamber, and a second set of ports on the top face within the at least one microchamber
Data Source
AI summary
A monolithically 3D printed array of microchannels in a multilayer circuit includes a base substrate and integrated microchamber to form a microelectrode array (MEA) device. Microchannels at different levels serve as conduits towards a centrally located 2.5D/3D Microelectrode Array (MEA) for electrical stimulation/recording of electrogenic spheroids, and as inlet/outlet for injection/suction of liquids, e.g., samples or reagents. The microchamber allows for control and isolation of the cultured microenvironment, and additionally perfusion of gases, such as O2 and CO2 for electroactive responses. The device is operative with organoids under Phosphate Buffer Saline (PBS) and sample gas (Oxygen) injection.