Microbead Filtration Column for Rare Cell Isolation Without Clogging
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Solution Overview
Problem
Existing methods for isolating circulating rare cells, such as CTCs and CTMs, face challenges in capturing efficiency, isolation purity, and throughput due to variability in cell surface markers, size overlap, cell damage, clogging, and complex designs, leading to inaccurate results and long processing times.
Innovation Solution
A method using a column with microbeads of specific diameters forming interstices as filters, allowing particles above a certain size to be trapped while minimizing shear stress and preventing clogging, with a suspension step to release trapped particles into a buffer solution for separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If filtration methods with porous filters are used to separate CTCs from blood cells by size, then isolation purity is improved, but cell damage and clogging occur
Solution Approach 1:
The invention uses a porous filtration matrix with controlled pore sizes (e.g., 8-12 μm) to separate CTCs from blood cells. The porous structure allows smaller cells to pass through while retaining larger CTCs, achieving high isolation purity without causing mechanical damage to the cells.
Solution Approach 2:
The invention transitions from traditional 2D filter surfaces to a 3D porous matrix structure. This three-dimensional filtration approach increases the available filtration area and reduces clogging by distributing cell flow through multiple pathways, thereby preventing cell damage while maintaining high isolation purity.
2Manufacturing precision
If filtration methods are used to separate CTCs by size, then isolation purity is improved, but processing time increases
Solution Approach 1:
The 3D porous matrix provides multiple parallel flow pathways, allowing large sample volumes to be processed simultaneously. This dimensional expansion of the filtration surface area enables rapid processing while maintaining high isolation purity through the size-selective porous structure.
Solution Approach 2:
The filtration matrix is divided into numerous small pores distributed throughout a three-dimensional structure. This segmentation creates many parallel filtration channels that process cells simultaneously, reducing overall processing time while each individual pore maintains high isolation purity through size-based separation.
3Device complexity
If conventional filtration systems are used, then simple design is maintained, but clogging occurs reducing throughput
Solution Approach 1:
The invention employs a three-dimensional porous matrix instead of traditional 2D filters. This 3D structure provides vastly increased surface area and multiple flow pathways, preventing clogging by distributing cell traffic throughout the matrix volume. The design remains relatively simple while achieving high throughput through this dimensional transformation.
Solution Approach 2:
The use of porous materials with controlled pore sizes creates a matrix structure that resists clogging. The interconnected porous network allows fluid and small particles to pass through while retaining larger CTCs, maintaining high throughput without requiring complex anti-clogging mechanisms.
4Reliability
If immunoaffinity-based enrichment is used targeting EpCAM, then capturing efficiency is improved for epithelial cells, but adaptability to different cell types decreases
Solution Approach 1:
The invention segments the enrichment approach into multiple independent targeting strategies. Rather than relying on a single EpCAM antibody, the system can be configured with different antibody specificities or physical filtration parameters to target various cell types, thereby maintaining high capturing efficiency across different cell populations while improving adaptability.
Solution Approach 2:
The filtration matrix design provides a universal platform that can be adapted to target different cell types by adjusting pore size or antibody selection. This multi-functional approach allows the same basic system to efficiently capture various cell types including CTCs, stem cells, or other rare cells, enhancing both capturing efficiency and adaptability.
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 method achieves high capturing efficiency, purity, and throughput by preserving cell viability and enabling rapid processing of large sample volumes, suitable for clinical applications.
Implementation Method 1
a first section comprising a first plurality of microbeads of a first diameter, wherein the first plurality of microbeads forms filtering interstices
Implementation Method 2
suspending the retained second portion of particles of the biological sample and the first section in a buffer solution to form a suspension
Data Source
AI summary
A method and an automated liquid handling system for the isolation of particles from a biological sample are provided. A column, a container and a filtration unit which are adapted to be used in such a method and system are provided. The column can include a section comprising a plurality of microbeads retained there.