Multi-Channel Microfluidic Device for CTC Capture
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Solution Overview
Problem
Current methods for detecting circulating tumor cells (CTCs) and cancer stem cells (CSCs) in blood are inefficient due to their rarity and the invasiveness of existing detection techniques, limiting their clinical significance and utility in cancer diagnosis and prognosis.
Innovation Solution
A multi-channel microfluidic device that captures CTCs and CSCs using specific markers like EpCAM, HER-2, and CSC markers such as CD44, utilizing cell rolling agents like E-selectin and multivalent binding through dendrimer nanolinkers to enhance capture efficiency and specificity, allowing for high-throughput analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional detection methods are used for CTCs, then detection can be performed, but sensitivity and specificity are insufficient due to the rarity of CTCs among normal blood cells
Solution Approach 1:
The device segments the detection process into multiple sequential steps: initial capture using E-selectin for cell rolling, enrichment through flow-based separation, and final identification using specific markers. This multi-stage segmentation allows progressive purification of CTCs from the vast excess of normal blood cells, achieving high sensitivity despite low CTC concentration
Solution Approach 2:
E-selectin acts as an intermediary molecule that facilitates the capture of CTCs by inducing cell rolling on the channel surface. This intermediary mechanism enables indirect capture of CTCs through their interaction with E-selectin, which then allows subsequent specific binding to CTC markers, significantly improving detection sensitivity
2Productivity
If Ficoll-based assays or immunomagnetic enrichment are used, then DTCs in bone marrow can be enriched, but the process is invasive and time-consuming
Solution Approach 1:
The invention replaces complex mechanical enrichment systems (Ficoll density gradient centrifugation, immunomagnetic separation) with a streamlined microfluidic flow-based system. The microchannel device uses controlled fluid flow to achieve cell separation and enrichment in a single pass, dramatically reducing processing time while maintaining high enrichment efficiency
Solution Approach 2:
The microchannel device integrates multiple functions into a single platform: initial cell capture, enrichment, concentration, and preparation for analysis. This multi-functional integration eliminates the need for multiple separate enrichment steps, reducing both time and operational complexity while achieving efficient CTC enrichment
3Productivity
If single-channel device design is used, then device complexity is low, but analysis throughput is limited
Solution Approach 1:
Multiple parallel microchannels are merged into a single integrated device structure, allowing simultaneous processing of multiple samples or sequential processing with rapid turnaround. The merged channel design maintains the simplicity of individual channels while achieving high throughput through parallelization and efficient sample flow management
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 device significantly improves the sensitivity and specificity of CTC and CSC detection, enabling efficient capture and differentiation, with a 25-fold increase in CTC purity and the ability to analyze 1 mL of blood in 7 minutes, compared to 20 minutes with single-channel designs.
Implementation Method 1
The chamber of microfluidic device comprises an immobilized cell rolling-inducing agent
Implementation Method 2
The cell capture surface includes a cell rolling-inducing agent and a CTC and/or CSC specific capturing agent
Data Source
AI summary
A method of capturing a Circulating Tumor Cell (CTC) and Circulating Cancer Cells (CSC) from a sample includes introducing a sample into a flow based multichannel device having a cell capture surface and a flow modification surface under conditions that allow a CTC to bind to a cell rolling-inducing agent and a capturing agent disposed on the cell capture surface. The invention also provides for flow based multichannel devices to capture CTCs and CSCs from a sample.