Microfluidic Rare Cell Capture With Low-Hemolysis Blood Circulation
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Solution Overview
Problem
Current methods for isolating circulating tumor cells (CTCs) from blood face challenges such as cell damage, low yield, and hemolysis, limiting the ability to process large volumes efficiently and accurately, which is crucial for early detection and analysis.
Innovation Solution
A microfluidic system with a bionic pump simulating cardiac compression and a microfluidic chip with pin-fin row arrays and smoothly transitioned curved surfaces, reducing shear stress and hemolysis, allowing for online capture of CTCs with reduced anticoagulant usage and enabling analysis of whole blood samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flow sorting technology is used to achieve high-speed cell sorting, then sorting speed is improved, but cell activity and integrity are damaged due to transient laser exposure
Solution Approach 1:
The patent replaces the optical/mechanical flow sorting system with a magnetic field-based isolation system. Magnetic particles coated with anti-EpCAM antibodies are used to capture CTCs through magnetic attraction, eliminating the need for laser exposure and mechanical shear forces that damage cell integrity while maintaining high throughput capability.
Solution Approach 2:
The patent introduces magnetic particles as an intermediary medium between the blood sample and the separation process. These particles carry specific antibodies that bind to CTC surface markers, enabling indirect capture and isolation without direct physical contact or laser exposure that would harm cell activity.
2Measurement precision
If Clear-cut system is used for CTC isolation, then detection capability is improved, but sample volume is limited and selective deviation occurs
Solution Approach 1:
The patent designs a universal isolation platform that can process large volumes of blood samples while maintaining high CTC detection sensitivity. The magnetic particle-based system can be scaled to handle various sample volumes without compromising detection capability, making it applicable to different clinical scenarios and patient populations.
Solution Approach 2:
The patent divides the isolation process into distinct functional modules: magnetic particle coating, antibody binding, magnetic separation, and cell recovery. This segmentation allows for optimized performance at each stage and enables processing of larger sample volumes by controlling the flow and concentration parameters of each module independently.
3Productivity
If conventional blood processing is used, then CTC capture is achieved, but hemolysis occurs and cell integrity is compromised
Solution Approach 1:
The patent replaces mechanical blood processing methods with a magnetic field-based approach. Magnetic particles are introduced to carry antibodies that bind to CTCs, and magnetic separation is performed using magnetic fields rather than mechanical force, thereby avoiding hemolysis and maintaining red blood cell integrity while effectively capturing CTCs.
Solution Approach 2:
The patent changes the physical and chemical parameters of the blood sample during processing by introducing magnetic particles and antibodies, then applying magnetic field forces for separation. This parameter change enables selective CTC capture without the mechanical stress and chemical agents that cause hemolysis in conventional methods.
4Device complexity
If small-volume blood sampling is used, then processing simplicity is maintained, but CTC detection sensitivity is reduced due to selective deviation
Solution Approach 1:
The patent employs a self-service isolation system where magnetic particles automatically bind to CTCs through antibody-antigen recognition, and the magnetic field automatically separates them from the blood sample. This automated process eliminates the need for complex manual processing while enabling large-volume sampling to improve detection sensitivity without compromising simplicity.
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 system ensures high capture efficiency of intact CTCs, reduces hemolysis, and allows for large-volume processing, improving the accuracy and sensitivity of CTC detection and analysis, while maintaining blood quality for reinfusion standards.
Implementation Method 1
a bionic pump simulating cardiac compression to provide circulating power for the system
Implementation Method 2
a pin-fin row array on the microfluidic chip reduces shear stress, allowing for efficient online capture of CTCs with low hemolysis
Implementation Method 3
The CellSearch system uses magnetic particles labeled with an anti-EpCAM antibody for the capture of CTCs in blood
Data Source
AI summary
Disclosed are a rare cell capture system and an application thereof. The system comprises a fluid tube device, a circulation power apparatus device, a component capture device and an optional anticoagulant release device, the circulation power apparatus device and the component capture device being connected in series to a fluid circulation system via the fluid tube device to form an extracorporeal fluid circulation pathway, the component capture device comprising a microfluidic chip or a chipset. Also disclosed is a method for using the capture system to capture rare cells in blood. The system and the application thereof have the advantages of being large-capacity, in-line and low-hemolysis.