Label-Free Particle Sorting via Magnetic Buoyancy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current particle and cell sorting techniques, such as those using magnetic-activated cell sorters, are label-based and time-consuming, and they face challenges with scaling due to variability in magnetic beads, limiting their efficiency and throughput.
Innovation Solution
A device and method utilizing a non-uniform magnetic field to separate particles within a magnetic fluid, allowing for label-free, high-efficiency, and high-throughput sorting of cells and particles by exploiting magnetic buoyancy forces, using ferrofluids and permanent magnets to direct particles into different outlets based on size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If label-based magnetic-activated cell sorting is used, then particles can be sorted by magnetic properties, but the process becomes time-consuming and throughput is limited
Solution Approach 1:
The invention extracts and eliminates the labeling step from the sorting process. By using label-free sorting based on intrinsic magnetic properties of cells, the time-consuming bead conjugation step is removed, directly increasing throughput while maintaining sorting precision
Solution Approach 2:
The invention performs preliminary magnetic buoyancy separation based on cell size and magnetic susceptibility before final sorting. This pre-separation step enriches the target population and reduces the complexity of subsequent sorting, improving both speed and accuracy
2Measurement precision
If magnetic beads are used for labeling, then particle sorting can be achieved, but variability in magnetic beads limits efficiency and scaling
Solution Approach 1:
The invention enables cells to sort themselves based on their intrinsic magnetic properties and size without requiring external magnetic bead labels. This self-sorting mechanism eliminates variability introduced by bead conjugation and ensures consistent, reliable sorting across different batches
Solution Approach 2:
The invention changes the sorting parameter from magnetic bead presence to intrinsic magnetic susceptibility and size. By measuring and sorting based on these fundamental cellular parameters, the system achieves higher reliability and consistency independent of bead variability
3Measurement precision
If complex microfabrication and auxiliary power supplies are used, then precise particle control can be achieved, but device complexity and cost increase
Solution Approach 1:
The invention replaces complex mechanical microfabrication structures and auxiliary power supplies with a simple magnetic field generation system. Permanent magnets create the necessary magnetic gradients without requiring powered actuators, significantly reducing device complexity while maintaining precise particle control
Solution Approach 2:
The invention uses simple, inexpensive permanent magnets instead of complex, expensive powered magnetic field generation systems. This substitution reduces both device complexity and cost while achieving the same particle manipulation precision
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
Achieves sorting efficiencies of 95% or more and throughputs of up to 10^7 cells per hour, with the device being cost-effective and straightforward to operate, eliminating the need for complex microfabrication and auxiliary power supplies.
Implementation Method 1
exposing the magnetic fluid and the particles to a non-uniform magnetic force; and separating the types of particles
Implementation Method 2
the first liquid includes a magnetic fluid and/or is mixed with the magnetic fluid
Data Source
AI summary
Embodiments of the present disclosure provide for devices, methods for separating particles, and the like.