3D Stretchable Microelectrode Arrays With Pockets for Organoid Recording
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Solution Overview
Problem
Current in vitro research methods fail to replicate the conditions of cells in an organism, leading to discrepancies between in vitro and in vivo cell behavior, particularly in drug screening for neurological diseases like Alzheimer's and traumatic brain injury, limiting the predictive value of in vitro data.
Innovation Solution
A 3D stretchable microelectrode array (sMEA) with 3D pockets lined with microelectrodes and embedded in a 3D matrix of Matrigel or hydrogel, incorporating microfluidic channels for biochemical diffusion, and capable of mechanical stretching and electrical stimulation to mimic physiological and pathological conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rigid substrate plates with culture wells are used for in vitro cell culture, then ease of manufacture and operation are improved, but the ability to replicate physiological conditions and predict in vivo behavior deteriorates
Solution Approach 1:
The patent employs flexible thin films including elastomeric substrates and polymeric membranes that can be stretched and deformed to create 3D pocket structures. These flexible films replace rigid substrate plates, enabling the formation of physiologically relevant 3D cell cultures while maintaining ease of operation through vacuum suction formation and integration with microelectrode arrays for simultaneous mechanical stimulation and electrophysiological recording.
Solution Approach 2:
The invention transitions from traditional 2D planar culture surfaces to 3D pocket structures by introducing a third dimension through vacuum-formed deformations in the flexible substrate. This dimensional change allows cells to grow in three-dimensional configurations that better mimic in vivo tissue architecture, thereby improving predictive value while maintaining operational simplicity.
2Adaptability or versatility
If 3D pocket structures are formed using vacuum suction, then the ability to accommodate differently shaped organoids and replicate physiological conditions is improved, but device complexity increases
Solution Approach 1:
The flexible substrate serves multiple functions simultaneously: it provides the structural basis for 3D pocket formation, acts as the medium for vacuum suction deformation, integrates microelectrodes for electrical recording and stimulation, and supports cell culture. This multi-functionality reduces overall device complexity despite the added adaptability for accommodating various organoid shapes and sizes.
Solution Approach 2:
The flexible substrate with integrated microelectrodes is designed to automatically form 3D pockets through vacuum suction without requiring complex external molding equipment or multi-step fabrication processes. The vacuum force self-assembles the desired 3D structure, and the integrated microelectrodes automatically provide both stimulation and recording capabilities, reducing operational complexity.
3Reliability
If microelectrode arrays are integrated with flexible substrates for simultaneous mechanical and electrical stimulation, then physiological relevance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention uses composite material structures combining elastomeric substrates with integrated microelectrode arrays. The elastomeric material provides flexibility for mechanical deformation while the integrated microelectrodes maintain electrical functionality. This composite approach allows simultaneous achievement of physiological relevance through mechanical stretching and electrical stimulation without requiring extremely high manufacturing precision, as the flexible nature accommodates reasonable variations in electrode 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
Provides a physiologically relevant in vitro model for drug screening and mechanistic studies, enhancing the accuracy of pre-clinical drug development by simulating mechanical and electrical environments, thereby improving the prediction of in vivo responses.
Implementation Method 1
a microelectrode array including a plurality of microelectrodes embedded in an elastomeric substrate
Implementation Method 2
at least one microfluidic channel for diffusing a biochemical into chambers of the 3D sMEA
Implementation Method 3
flexible pockets formed, for example, by vacuum suction
Data Source
AI summary
A soft and stretchable microelectrode array (sMEA) including a first circuit board having a first though hole; a second circuit board having a second through hole; a microelectrode array including a plurality of microelectrodes embedded in an elastomeric substrate, wherein the microelectrode array is disposed between the first and second printed circuit boards, and includes an exposed portion corresponding the first and second through holes; a plurality of contact pads formed on a top or bottom surface of the first printed circuit board and electrically connected to the plurality of microelectrodes; and a culture well mounted on the first printed circuit board and encompassing the first through hole. Further, the exposed portion of the microelectrode array includes a 3D pocket lined with stretched microelectrodes for electrically stimulating and recording signals from an organoid placed in the 3D pocket.