Journal
LAB ON A CHIP
Volume 12, Issue 20, Pages 3952-3960Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2lc40679a
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Funding
- MOST [2011CB933201, 2009CB930001, 2011CB707604]
- NSFC [51105086, 21025520, 90813032, 50890182]
- CAS [KJCX2-YW-M15]
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This work reports on a passive double spiral microfluidic device allowing rapid and label-free tumor cell separation and enrichment from diluted peripheral whole blood, by exploiting the size-dependent hydrodynamic forces. A numerical model is developed to simulate the Dean flow inside the curved geometry and to track the particle/cell trajectories, which is validated against the experimental observations and serves as a theoretical foundation for optimizing the operating conditions. Results from separating tumor cells (MCF-7 and Hela) spiked into whole blood indicate that 92.28% of blood cells and 96.77% of tumor cells are collected at the inner and the middle outlet, respectively, with 88.5% tumor recovery rate at a throughput of 3.33 x 10(7) cells min(-1). We expect that this label-free microfluidic platform, driven by purely hydrodynamic forces, would have an impact on fundamental and clinical studies of circulating tumor cells.
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