Microfluidic Chemogradient CTC Separation
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Solution Overview
Problem
Current methods for separating and subtyping circulating tumor cells (CTCs) face challenges due to limited availability of viable CTCs, inefficiencies in label-based technologies, and complications in label-free methods, which result in low purity and time-consuming sample preparation, hindering comprehensive molecular analysis and further separation of CTCs.
Innovation Solution
The development of microfluidic devices and kits that utilize chemo-modulatory fluids to create chemogradient-based separation and subtyping of CTCs, allowing for enrichment, separation, and classification of rare cells through microfluidic channels and collection channels, enabling the distinction of target cells from non-target cells based on migratory behaviors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If label-based CTC separation technologies are used to selectively enrich CTCs through specific biological markers, then CTC enrichment is improved, but the heterogeneity of CTCs and variable biomarker expression render these technologies ineffective for general use
Solution Approach 1:
The patent transitions from label-based separation (relying on variable biomarker expression) to label-free separation exploiting physical parameters (size, deformability, density) that are consistent across all CTCs regardless of biomarker status, thereby achieving both high enrichment accuracy and universal applicability
Solution Approach 2:
The patent replaces biochemical labeling mechanisms with physical separation mechanisms, using microfluidic devices that exploit mechanical properties (size, deformability) of CTCs to achieve separation without relying on variable biological markers
2Measurement precision
If label-free methods are used to separate CTCs based on size, then CTC enrichment is achieved, but the existence of large white blood cells with overlapping sizes reduces the purity of the sample
Solution Approach 1:
The patent moves from relying on size alone (which causes overlap with WBCs) to utilizing multiple physical parameters simultaneously, including cell deformability, density, and mechanical properties, to achieve both high enrichment and high purity separation
Solution Approach 2:
The patent employs multiple sequential separation stages in the microfluidic device, each targeting different physical properties, to progressively purify the CTC sample from contaminants like large white blood cells
3Measurement precision
If previous separation methods are used, then CTC separation is achieved, but time-consuming and laborious sample preparation is required due to complications from overlapping cell sizes
Solution Approach 1:
The patent combines multiple separation mechanisms (size-based filtration, deformability-based sorting, density-based separation) into a single integrated microfluidic device, achieving high-purity CTC separation in one continuous process without time-consuming sequential preparation steps
Solution Approach 2:
The microfluidic device performs automated separation based on inherent physical properties of cells, eliminating the need for manual intervention, labeling, or complex sample preparation steps that characterize previous methods
4Measurement precision
If label-based technologies are used for CTC separation, then CTC enrichment is achieved, but comprehensive molecular analysis is hindered because cells are either dead or immobilized to a surface
Solution Approach 1:
The patent replaces adhesive surface-based separation with non-contact or minimal-contact physical separation mechanisms, using flow-based sorting and mechanical property differences to separate CTCs while maintaining them in a viable, analysis-ready state
Solution Approach 2:
The patent changes the separation mechanism from biochemical adhesion (which requires cell attachment and often kills cells) to physical parameter-based separation in flowing media, preserving cell viability and enabling downstream molecular analysis
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
These devices and methods achieve high-purity separation and subtyping of CTCs, maintaining cell viability and allowing for further characterization, thereby overcoming previous limitations in CTC separation and analysis.
Implementation Method 1
utilize chemo-modulatory fluids to create chemogradient-based separation and subtyping of CTCs, allowing for enrichment, separation, and classification of rare cells through microfluidic channels
Data Source
AI summary
The present disclosure provides devices, kits, and methods for enriching/separating and/or subtyping target cells from a biological sample, such as circulating tumor cells or other types of rare cells or differentiating cells. Devices, kits, and methods of the present disclosure utilize a created chemogradient to modulate movement of target and/or non-target cells in a sample based on attraction and/or repulsion to certain chemical compounds to separate and subtype cells in a sample.