Ferromagnet-Infused Microstructure Array for Cell Sorting
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Solution Overview
Problem
Current biological cell sorting methods are inefficient for adherent cells, leading to cell loss and purity issues due to reliance on chemical digestion and gravity-based transfer, which also compromise imaging clarity.
Innovation Solution
A magnet-infused microstructure array with photolithographically patterned through holes filled with ferromagnetic material, allowing for individual cell capture and transfer without disrupting imaging conditions, using a magnetic probe for precise collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If chemical digestion methods are used to remove cells from growth substrates, then cell sorting can be achieved, but cell purity is reduced and cell phenotypes are altered
Solution Approach 1:
The microarray divides the cell culture into discrete, isolated microstructures where each structure contains one or a few cells. This segmentation allows individual cells to be manipulated and sorted without affecting surrounding cells, enabling high-purity sorting without chemical digestion. The physical isolation in separate microstructures prevents contamination from chemical enzymes and maintains cell phenotype integrity.
Solution Approach 2:
The patent replaces chemical digestion mechanisms with magnetic field-based mechanical manipulation. Ferromagnetic materials integrated into the microstructures enable magnetic probes to physically capture and transfer cells without chemical enzymes. This substitution eliminates the harmful chemical effects while maintaining precise cell-level control for high-purity sorting.
2Ease of operation
If gravity-based transfer is used to collect microstructures, then cell collection is simplified, but imaging clarity is compromised and sample purity is reduced
Solution Approach 1:
The patent replaces gravity-based passive transfer with active magnetic field-based collection. Magnetic probes selectively attract and capture microstructures containing cells of interest, enabling precise control over which cells are collected. This active mechanism maintains imaging clarity by allowing targeted collection without disrupting the optical pathways required for clear imaging, while gravity-based methods cause uncontrolled mixing and loss of purity.
Solution Approach 2:
Ferromagnetic materials serve as intermediaries between the microstructures and the magnetic probes. These magnetic particles enable selective interaction between the collection system and target cells without requiring direct contact or gravity-dependent processes. The magnetic intermediary allows precise, controlled collection that preserves both imaging quality and sample purity.
3Adaptability or versatility
If ferromagnetic material is added to microstructures, then magnetic collection capability is enabled, but imaging clarity may be affected
Solution Approach 1:
The ferromagnetic materials are strategically positioned at specific locations within the microstructures rather than uniformly distributed throughout. This localized placement enables magnetic interaction at the needed interfaces while minimizing interference with optical pathways for imaging. The spatial separation of magnetic and optical functions allows both capabilities to coexist without compromising either.
Solution Approach 2:
The magnetic materials are confined to specific regions of the microstructure where they serve their collection function, leaving other regions optically clear for imaging. This localized quality approach ensures that the magnetic properties are present only where necessary for magnetic capture, while the overall microstructure remains transparent and suitable for high-quality imaging.
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
Enables selective and efficient sorting of adherent cells with improved purity and imaging clarity, facilitating faster data acquisition and more effective cell collection compared to previous methods.
Implementation Method 1
Each of the through holes or vias is individually filled with a small selection of ferromagnetic material such as, e.g., gold coated nickel
Implementation Method 2
The exemplary embodiment utilizes a magnetic probe to individually collect ejected microstructures carrying cell colonies from the array
Implementation Method 3
Each of the through holes or vias is individually filled with a small selection of ferromagnetic material such as, e.g., gold coated nickel created using a three (3) step electrolytic metal plating process
Data Source
AI summary
Systems and methods directed to an array of microstructures for biological cell sorting with each individual structure component including an integrated magnetic element.