Non-Equilibrium Gravity Fractionation for Stem Cell Viability
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Solution Overview
Problem
Current methods for fractionating adherent stem cells, such as GrFFF, are unsuitable for high-throughput sorting due to equilibrium conditions that lead to cell damage and viability reduction, and existing techniques are costly, complex, and not suitable for clinical applications.
Innovation Solution
The Non-Equilibrium, Earth Gravity-Assisted Dynamic Fractionation (NEEGA-DF) method performs flow/gravity-assisted fractionation under non-equilibrium conditions, allowing cells to maintain native features and viability, and is designed for high-throughput sorting of adherent stem cells without the need for complex instrumentation or genetic manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional GrFFF methods are used for stem cell fractionation, then separation of cell populations is achieved, but cell viability and differentiation capability are reduced due to equilibrium conditions
Solution Approach 1:
The patent applies dynamic fractionation by continuously moving the cell sample through the fractionation device under controlled flow conditions, preventing the system from reaching equilibrium. This dynamic approach maintains cell viability while achieving separation based on cell size and density, resolving the contradiction between separation precision and cell viability.
Solution Approach 2:
The patent changes the operational parameters by controlling flow rate and pressure gradients to maintain non-equilibrium conditions throughout the fractionation process. By adjusting these parameters, the system achieves effective cell separation without the adverse effects of equilibrium conditions on cell viability.
2Productivity
If high-throughput sorting is implemented, then productivity increases, but cell damage and viability reduction occur
Solution Approach 1:
The patent employs hydraulic flow control systems to manage the movement of cell suspensions through the fractionation device. By using controlled fluid flow rather than mechanical manipulation, high-throughput sorting is achieved while minimizing mechanical stress and damage to cells.
Solution Approach 2:
The patent replaces traditional mechanical sorting mechanisms with a flow-based fractionation system that uses pressure gradients and fluid dynamics to separate cells. This substitution eliminates the need for physical contact and mechanical forces that could damage cells, enabling high-throughput sorting without cell damage.
3Measurement precision
If FACS or MACS methods are used for positive selection, then stem cell sorting capability is improved, but physiological suffering and viability reduction occur
Solution Approach 1:
The patent replaces the mechanical and chemical processes of FACS/MACS with a purely physical fractionation method based on flow dynamics and cell biophysical properties. This substitution achieves accurate stem cell sorting without the physiological stress caused by flow cytometry or magnetic bead attachment.
Solution Approach 2:
The patent uses the cell suspension medium and flow field as intermediaries to achieve separation, rather than direct interaction with cells through antibodies or magnetic beads. This indirect approach maintains cell integrity while enabling precise sorting based on intrinsic cell properties.
4Measurement precision
If genetic-engineering approaches are used for cell selection, then selection precision is improved, but cost and complexity increase
Solution Approach 1:
The patent enables cells to be separated based on their inherent biophysical properties (size, density, deformability) without requiring external genetic modification or labeling. The cells essentially sort themselves through the flow field based on their natural characteristics, eliminating the need for complex genetic engineering protocols.
Solution Approach 2:
The patent extracts and utilizes the intrinsic biophysical properties of cells for separation, removing the need for artificial genetic markers or engineering. By focusing on naturally occurring cell properties, the method achieves accurate selection with minimal complexity.
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
NEEGA-DF enables high-throughput fractionation of viable, totipotent stem cells with full maintenance of viability and differentiation potential, reducing operational and maintenance costs, and is suitable for clinical applications with improved sample recovery and throughput.
Implementation Method 1
Non-Equilibrium, Earth Gravity-Assisted Dynamic Fractionation (NEEGA-DF) method performs flow/gravity-assisted fractionation under non-equilibrium conditions
Implementation Method 2
The sample is eluted from the fractionation device and the stem cell fractions are collected
Data Source
AI summary
A method and the relevant instrumentation to fractionate living, adherent stem cells, particularly of human origin, from different sources is disclosed, said method is based on the non-equilibrium, dynamic fractionation of cells assisted by the Earth gravity field.