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Biomedical Microdevices

, Volume 13, Issue 1, pp 159–167 | Cite as

Asymmetry of blood flow and cancer cell adhesion in a microchannel with symmetric bifurcation and confluence

  • Takuji IshikawaEmail author
  • Hiroki Fujiwara
  • Noriaki Matsuki
  • Takefumi Yoshimoto
  • Yohsuke Imai
  • Hironori Ueno
  • Takami Yamaguchi
Article

Abstract

Bifurcations and confluences are very common geometries in biomedical microdevices. Blood flow at microchannel bifurcations has different characteristics from that at confluences because of the multiphase properties of blood. Using a confocal micro-PIV system, we investigated the behaviour of red blood cells (RBCs) and cancer cells in microchannels with geometrically symmetric bifurcations and confluences. The behaviour of RBCs and cancer cells was strongly asymmetric at bifurcations and confluences whilst the trajectories of tracer particles in pure water were almost symmetric. The cell-free layer disappeared on the inner wall of the bifurcation but increased in size on the inner wall of the confluence. Cancer cells frequently adhered to the inner wall of the bifurcation but rarely to other locations. Because the wall surface coating and the wall shear stress were almost symmetric for the bifurcation and the confluence, the result indicates that not only chemical mediation and wall shear stress but also microscale haemodynamics play important roles in the adhesion of cancer cells to the microchannel walls. These results provide the fundamental basis for a better understanding of blood flow and cell adhesion in biomedical microdevices.

Keywords

Microchannel Blood flow Red blood cells Cancer cells Bifurcation Confluence 

Notes

Acknowledgments

The authors are grateful for helpful discussions with Dr. R. Lima in Braganca Polytechnic Institute, and Prof. C. T. Lim in National University of Singapore. This study was supported by Grant-in-Aid for Scientific Research (S) from the Japan Society for the Promotion of Science (JSPS; No. 19100008) and by a Grant-in-Aid for Young Scientists (A) from the JSPS (No. 19686016). We also acknowledge the support from the 2007 Global COE Program “Global Nano-Biomedical Engineering Education and Research Network Centre”.

Supplementary material

Movie 1

Distribution of RBCs and cell-free layers around the bifurcation. The movie is taken by a standard halogen light, and hematocrit is about 10%. (MOV 1345 kb)

Movie 2

Distribution of RBCs and cell-free layers around the confluence. The movie is taken by a standard halogen light, and hematocrit is about 10%. (MOV 1355 kb)

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Takuji Ishikawa
    • 1
    Email author
  • Hiroki Fujiwara
    • 1
  • Noriaki Matsuki
    • 2
  • Takefumi Yoshimoto
    • 1
  • Yohsuke Imai
    • 1
  • Hironori Ueno
    • 3
  • Takami Yamaguchi
    • 2
  1. 1.Department of Bioengineering and Robotics, Graduate School of EngineeringTohoku UniversitySendaiJapan
  2. 2.Department of Biomedical Engineering, Graduate School of Biomedical EngineeringTohoku UniversitySendaiJapan
  3. 3.International Advanced Research and Education OrganizationTohoku UniversitySendaiJapan

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