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Size-based hydrodynamic rare tumor cell separation in curved microfluidic channels
Jiashu Sun1, Chao Liu2, Mengmeng Li1
1CAS Key Lab for Biological Effects of Nanomaterials and Nanosafety, National Center for NanoScience and Technology, Beijing 100190, China.
Biomicrofluidics
|January 8, 2014
Summary
This study presents a novel method for separating rare tumor cells from blood using hydrodynamic forces in a microfluidic device. The technique achieves high purity and throughput for label-free cancer cell isolation.
Area of Science:
- Biomedical Engineering
- Microfluidics
- Cell Separation Technology
Background:
- Accurate separation of rare tumor cells from blood is crucial for cancer diagnosis and treatment monitoring.
- Existing cell separation methods often require cell labeling or are limited in throughput and efficiency.
Purpose of the Study:
- To develop a rapid, continuous, and label-free method for rare tumor cell separation.
- To leverage hydrodynamic forces within a microchannel for size-based cell separation.
Main Methods:
- Utilized a double spiral microchannel to exploit the interplay between inertial lift force and Dean drag force.
- Employed numerical modeling to investigate the hydrodynamic separation mechanism.
- Conducted experiments using polystyrene particles and spiked cancer cells in diluted blood.
Main Results:
- Achieved over 95% separation purity for polystyrene particles of different sizes at flow rates above 30 ml/h.
- Demonstrated high throughput (2.5 × 10^8 cells/min) and efficient separation (over 90%) of HeLa cells from diluted blood.
Conclusions:
- The double spiral microchannel effectively separates cells based on size using hydrodynamic effects.
- This label-free approach offers a promising solution for high-throughput rare tumor cell isolation in clinical applications.
