Magnetic Particle Separator Using Induced Wire Field
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Solution Overview
Problem
Current magnetic separation techniques for microscopic particles, such as magnetically tagged cells, face limitations in resolution, efficiency, and throughput, particularly in miniaturized systems, which hinder the effective separation and enumeration of target cell populations with high collection efficiencies and scalability.
Innovation Solution
A magnetic particle separator utilizing an induced magnetic field through an externally magnetizable wire within a microfluidic channel, allowing for the separation of magnetic particles based on their distinct properties, such as magnetic susceptibility and size, by generating a repulsive magnetic force that deflects particles into spatially addressable routes, enabling continuous, multi-target, and high-throughput separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional MACS techniques are used for cell separation, then high-purity cell populations can be obtained, but the procedure becomes very time-consuming due to multiple pre-processing and washing steps
Solution Approach 1:
The invention performs magnetic separation directly on the sample without requiring preliminary enrichment or washing steps. The continuous flow system separates target cells from the original heterogeneous suspension in a single operation, eliminating the multiple pre-processing and washing procedures that characterize conventional MACS techniques.
Solution Approach 2:
The invention implements continuous flow magnetic separation where the sample flows continuously through the magnetic field gradient, enabling uninterrupted separation of target cells. This continuous operation replaces the batch-wise processing of conventional MACS, significantly reducing processing time while maintaining high purity cell population separation.
2Quantity of substance
If microfluidic MACS technology is used to miniaturize the analysis chamber, then smaller sample volumes can be analyzed, but the throughput is limited compared to other continuous flow methods
Solution Approach 1:
The invention optimizes the magnetic field gradient strength and flow rate parameters to achieve high throughput in a microfluidic system. By carefully controlling these parameters, the system processes larger volumes per unit time while maintaining the miniaturized chamber design, thus increasing productivity without sacrificing the sample volume reduction benefits of microfluidics.
Solution Approach 2:
The invention introduces a strong magnetic field gradient dimension perpendicular to the flow direction, creating a three-dimensional separation space within the microfluidic channel. This allows particles to be separated along the magnetic field gradient while flowing through the channel, effectively increasing the separation capacity and throughput beyond what would be possible with simple two-dimensional microfluidic approaches.
3Adaptability or versatility
If affinity-based approaches such as cell adhesion chromatography are used, then alternative separation methods are provided, but the efficiency and purity of cell capture are limited
Solution Approach 1:
The invention replaces affinity-based chemical interactions with physical magnetic field gradient-based separation. Instead of relying on cell adhesion to chromatography media or receptor-ligand binding, the system uses magnetophoresis to separate magnetically labeled target cells from non-magnetic cells, achieving higher capture purity and efficiency while maintaining method versatility.
Solution Approach 2:
The invention changes the separation mechanism from chemical affinity to physical magnetic properties. By applying a magnetic field gradient, the system separates cells based on their magnetic susceptibility rather than biochemical affinity, fundamentally altering the separation parameter and achieving superior cell capture purity while preserving the ability to separate different cell types by labeling with appropriate magnetic markers.
4Manufacturing precision
If fluorescence activated cell sorting is used to achieve highly pure cell populations, then individual cell sorting based on fluorescence properties is possible, but expensive equipment and limited throughput are required
Solution Approach 1:
The invention replaces the complex optical detection and sorting mechanism of FACS with a simpler magnetic field-based separation system. Instead of using lasers, photodetectors, and electronic sorting controls, the system uses magnetic field gradients to physically separate magnetically labeled cells, achieving comparable or superior purity with much lower cost and significantly higher throughput.
Solution Approach 2:
The invention extracts and utilizes only the magnetic labeling aspect of cell identification, eliminating the need for fluorescent dyes, optical detection systems, and complex sorting electronics. By taking out the magnetic separation function and isolating it from the complex FACS apparatus, the system achieves high purity cell separation with simplified equipment and increased throughput.
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
The solution enhances the separation efficiency and scalability of magnetic particles, allowing for the collection and detection of target particles with high purity, and can be integrated with other processes or platforms for enhanced sorting protocols, addressing the limitations of existing technologies.
Implementation Method 1
An external magnetic field source may be provided for generating an external magnetic field along a lateral axis orthogonal to both the longitudinal axis and the transverse axis. The external magnetic field generates an induced magnetic field in and around the externally magnetizable wire
Implementation Method 2
The magnetic particle separator uses an induced magnetic field to separate magnetic particles held in solution by magnetophoresis
Implementation Method 3
this induced magnetic field applies a repulsive magnetic force to the target magnetic particles
Implementation Method 4
The mixture of the first and second magnetic particles in the buffer solution flows through the hollow channel along the longitudinal direction toward the outlet end thereof
Data Source
AI summary
The magnetic particle separator uses an induced magnetic field to separate magnetic particles held in solution by magnetophoresis. The magnetic particles may be, for example, inherently paramagnetic or superparamagnetic, may be magnetically tagged or the like. First and second magnetic particles initially flow along a longitudinal direction. An external magnetic field along a lateral direction, orthogonal (or near orthogonal) to the longitudinal direction, is applied to an externally magnetizable wire, which extends along a transverse direction orthogonal to both the longitudinal and lateral directions. The external magnetic field generates an induced magnetic field in the externally magnetizable wire, and the induced magnetic field generates repulsive magnetic force on the first and second magnetic particles. Due to differing magnetic susceptibility, size and/or mass between the first and second magnetic particles, they are separated by following separate paths generated by the respective magnetic forces thereon.