Magnetic Levitation Cell Sorting for Portable Label-Free Diagnosis
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Solution Overview
Problem
Existing magnetic levitation technologies are not compatible with microscopy and are not suitable for portable, robust, and inexpensive disease diagnosis and prognosis monitoring platforms for point-of-living applications, particularly in clinical and home settings, lacking the ability to separate and analyze cells without labels.
Innovation Solution
A magnetic levitation-based diagnosis system using a smartphone-integrated imaging device separates cells based on their magnetic susceptibility and intrinsic density, allowing label-free identification and quantification of cell types, such as white and red blood cells, through a microcapillary or microfluidic channel with a magnetic field, enabling high-throughput isolation of circulating tumor cells and other biological moieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional magnetic levitation setups are used, then separation based on density and magnetic susceptibility is achieved, but the system is not compatible with microscopy and not suitable for portable applications
Solution Approach 1:
The system segments the magnetic levitation function into a compact microfluidic chip with integrated magnets, separating it from the imaging function performed by external microscopy equipment. This allows the magnetic separation core to be miniaturized while maintaining compatibility with standard microscopy systems.
Solution Approach 2:
The patent nests the magnetic levitation components (magnets, microchannel) within a compact housing that can be integrated into or positioned near microscopy equipment. The smartphone is nested within the device housing, providing both imaging and computational capabilities in a portable package.
2Ease of operation
If label-free cell identification is implemented, then ease of operation and cost are improved, but measurement precision and reliability may be compromised
Solution Approach 1:
The system changes the measurement parameters from optical/chemical labels to physical properties (density and magnetic susceptibility) that inherently differ between cell types. This label-free approach uses fundamental cellular properties rather than added markers, simplifying operation while maintaining precision through multi-parameter measurement.
Solution Approach 2:
The patent replaces complex optical labeling and detection systems with a magnetic field-based separation and imaging approach. This substitution uses magnetic forces and optical imaging of the magnetic field interaction, eliminating the need for fluorescent labels or complex staining protocols while maintaining cell identification accuracy.
3Productivity
If high-throughput isolation is achieved, then productivity increases, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The system uses microfluidic hydraulic principles to achieve high-throughput cell processing. The paramagnetic medium flow through the microchannel enables continuous sample processing, and the magnetic field applied perpendicular to flow direction separates cells based on their magnetic susceptibility, allowing high throughput without complex mechanical moving parts.
Solution Approach 2:
The patent changes the operating parameters by using a flowing paramagnetic medium instead of static separation methods. This enables continuous high-throughput processing while the microfluidic channel design and integrated magnets keep the manufacturing process relatively simple using standard microfabrication techniques.
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 efficient separation and analysis of cells at single-unit resolution, facilitating disease diagnosis and monitoring in various settings, including home and clinical environments, and supports applications like high-throughput isolation of rare CTCs and three-dimensional cell culture.
Implementation Method 1
a magnetic field is applied using the magnet(s) to the sample, such that the application of the magnetic field levitates at least a portion of the population of moieties
Implementation Method 2
separates cells based on their magnetic susceptibility and intrinsic density
Implementation Method 3
different units (for example, white and red blood cells or other moieties) are levitated in a magnetic gradient and separated due to their unique densities
Data Source
Figure 1A~2H
Figure 3A~3F
Figure 4A~4E
AI summary
Systems and methods for levitating populations of moieties, cells, or other such units using one or more magnets in a microfluidic environment are provided. These systems and methods may be used to, for example, separate or sort heterogeneous populations of the units from one another, to assembly a multi-unit assembly during the levitating of the units, and to evaluate samples at the point of care in real-time. These systems and methods may also utilize a frame that enables an imaging device, such as a smartphone, to capture the units in real time as they are manipulated in the system.