Necrotic Core-Free Assembloid Assembly for Stable MEA Neural Circuits
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Solution Overview
Problem
Existing methods for producing organoids struggle to create highly integrated neural circuits due to issues with necrotic cores and inefficient attachment to multi-electrode arrays, limiting their application in computing devices.
Innovation Solution
A method involving the production of necrotic core-free organoids, forming primary assembloids through orbital shakers, and then stacking or laterally connecting them to produce a secondary assembloids, which includes adjusting the size of the organoids, well size, and rotation speed to achieve desired shapes and improve attachment to multi-electrode arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organoid production methods are used, then organoids can be formed, but they develop necrotic cores that reduce their functionality
Solution Approach 1:
The patent segments the organoid production process into controlled stages with specific culture conditions for each stage. Organoids are cultured in a multi-stage process where early stages promote uniform growth before differentiation, preventing necrotic core formation while maintaining functionality. The segmentation of culture conditions (different media, temperatures, and time points) ensures uniform organoid development.
Solution Approach 2:
The patent systematically changes cultural parameters including temperature (37°C vs. 34°C), media composition (B27 supplement variations), and timing to optimize organoid development. These parameter changes control the differentiation process and prevent necrotic core formation while maintaining organoid functionality for computing applications.
2Reliability
If organoids are attached to multi-electrode arrays, then neural circuit functionality can be measured, but attachment stability is insufficient
Solution Approach 1:
The patent uses an intermediary substance (poly-D-lysine coating) to facilitate stable attachment between organoids and multi-electrode arrays. This intermediary layer on the MEA surface provides enhanced adhesion properties, ensuring stable neural circuit formation and signal measurement without complex mechanical attachment methods.
3Productivity
If highly integrated neural circuits are produced, then computing device functionality improves, but production complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-differentiating stem cells into specific neural progenitor states before assembly, and by pre-coating MEA surfaces with adhesion promoters. These preliminary steps simplify the subsequent assembly process and enable highly integrated neural circuits to form more readily, reducing overall production complexity.
Solution Approach 2:
The patent merges multiple organoids into integrated neural circuit assemblies through controlled co-culture conditions. By combining organoids derived from different stem cell sources or differentiation stages, the method creates highly integrated neural networks that exhibit emergent computing functionality while managing production complexity through standardized protocols.
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
This method enables the production of complex neural networks with improved attachment stability and connectivity, suitable for computing devices such as biocomputers, neuromorphic semiconductors, biosensors, and quantum computers, enhancing the functionality of neural circuits.
Implementation Method 1
producing a primary assembloid having at least one of a sheet shape and a line shape by connecting the plurality of necrotic core-free organoids... produced using an orbital shaker after the plurality of necrotic core-free organoids are positioned in a well
Data Source
AI summary
A method of producing an assembloid, including: producing a plurality of necrotic core-free organoids; producing a primary assembloid having at least one of a sheet shape and a line shape by connecting the plurality of necrotic core-free organoids; and producing a secondary assembloid by laterally or vertically connecting the primary assembloid with at least one additional primary assembloid.