Flow-Enhanced Non-Linear Magnetophoresis for Particle Separation
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Solution Overview
Problem
Current bio-separation techniques, such as liquid chromatography, electrophoresis, and linear magnetophoresis, are slow and face challenges with particle coagulation, making them inefficient for multiple separations and complex sample analysis.
Innovation Solution
A flow-enhanced non-linear magnetophoretic (F-NLM) separator using a chip-based device with distinct fluid paths and magnetic arrays, where a rotating magnetic field and controlled flow rates selectively trap and transport particles based on their magnetic properties, allowing for efficient separation of different particle types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If linear magnetophoresis is used with a very strong magnetic field and field gradient, then separation of particles can be achieved, but magnetic particles coagulate to form undetectable complexes such as chains
Solution Approach 1:
The patent applies a rotating magnetic field instead of a static strong magnetic field. The field rotates at a frequency that prevents particles from settling into fixed chains while still providing sufficient magnetic force for separation. This dynamic approach maintains particle dispersion while achieving separation based on magnetic moment differences.
Solution Approach 2:
The magnetic field is applied periodically through rotation at specific frequencies. By controlling the rotation frequency to match or exceed the particle response time, the system prevents coagulation while maintaining separation efficiency. The periodic reversal of field direction disrupts chain formation.
2Measurement precision
If conventional bio-separation techniques like liquid chromatography, electrophoresis, or centrifugation are used, then high resolution separation is achieved, but the process is slow and difficult to implement
Solution Approach 1:
The patent replaces mechanical separation mechanisms (chromatography columns, electrophoresis buffers, centrifugal force) with a magnetic field-based system. This substitution enables faster separation speeds while maintaining high resolution, as magnetic forces act directly on particles without requiring complex mechanical setups or long processing times.
3Device complexity
If a single fluid path is used in the separation device, then device complexity is reduced, but the ability to separate multiple particle types simultaneously is limited
Solution Approach 1:
The device divides the single fluid path into multiple parallel fluid paths, each equipped with its own magnetic array. This segmentation allows different particle types to be separated simultaneously in different channels based on their specific magnetic properties, while each individual channel remains relatively simple in design.
Solution Approach 2:
The magnetic array system is designed to be universally applicable across multiple fluid paths. The same basic magnetic array structure can be replicated and configured in different channels to handle various particle types, providing multi-functionality without significantly increasing overall device 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
Enables rapid and efficient separation of particles with high sensitivity to size and magnetic moment, improving the resolution and speed of bio-separation processes, particularly in complex mixtures like blood samples.
Implementation Method 1
a magnetic array provided proximal to the first fluid path such that particles within the sample operably experience an induced magnetic field causing a retention of particles of the first type within the first fluid path
Implementation Method 2
flow-enhanced non-linear magnetophoretic (F-NLM) separator... where a rotating magnetic field and controlled flow rates selectively trap and transport particles based on their magnetic properties
Data Source
Figure 1(a)~1(c)
Figure 2(a)
Figure 2(b)
AI summary
A flow enhanced method and system for flow non-linear magnetophoresis (F-NLM) is described. By tuning an external field frequency and the flow rate the migration velocities of different bead types may be caused to differ by several orders of magnitude over an extended range of frequencies to allow for separation of particles. Use of such efficiency in separation in bio-separation and similar assays is described.