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혈장추출을 위한 high-throughput 미세유체소자
남정훈(Jeonghun Nam),이용진(Yongjin Lee),임현정(Hyunjung Lim),설수빈(Shubin Xue),신유진(Yoojin Shin),정석(Seok Chung),신세현(Sehyun Shin) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The technique for plasma extraction from blood is important in clinical diagnostics or biochemical analysis. Recently, with the rapid progress of micrototal-analysis (micro-TAS), techniques for cell separation have been required. In this work, we have developed the microfluidic device using standing surface acoustic wave (SSAW) for blood plasma extraction. The device was consisted of polydimethysiloxane (PDMS) microchannel and SSAW substrate. The test for the evaluation of extraction efficieny was performed on diluted blood samples having different hematocrit levels(5%, 10%, 15%, 20%). The results obtained in this study will provide useful informatiom in developing of high-throughput microfluidic device for plasma extraction from whole blood.
이용진(Yongjin Lee),남정훈(Jeonghun Nam),임현정(Hyunjung Lim),설수빈(Shubin Xue),신유진(Yoojin Shin),정석(Seok Chung),신세현(Sehyun Shin) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Particles in various sizes(diameter 1, 10㎛) were lined up in the middle of the micro-fluidic channel by sheath flow. Standing surface acoustic wave(SSAW) pushes the particles that was initially at the center of the micro-channel to the walls of the microchannel. SSAW was formed by two parallel inter-digital transducers (IDTs) on a LiNbO₃ substrate. As AC signal (frequency: 25.1 ㎒) was applied to the IDTs, depending on the particle physical components, such as size and density, the distance between sample flow which was the initial position of the particle and the position after the particle is pushed by SSAW differs. By this phenomenon we can sort particles by its size and density.
Comparison of Backscattering and Transmission Methods for Measuring RBC Aggregation
Yijie Yang(양 이지에),Jaeyong Ko(고재용),Jeonghun Nam(남정훈),ChangBeom Kim(김창범),Sehyun Shin(신세현) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The aggregation characteristics of red blood cells (RBCs) play an important role in the microvascular flow system and increased RBC aggregation has been observed in various pathological diseases, such as thrombosis and myocardial infarction. Currently available techniques for measuring RBC aggregation used to adopt optical methods such as backscattering and transmission. The present study aims to compare these two methods in measuring RBC aggregation based on a disposable microchip with a magnetic stirring mechanism and a laser-light backscattering/transmission detection system. In the results, the backscattering method showed higher value of aggregation index than the transmission method. In order to discussed the cause of the difference between two methods and optical characteristics in RBC suspensions, two methods were investigated with varying chamber height of microchip, hematocrit and fibrinogen concentration.
A Novel Stress-Scanning Microfluidic Assay of RBC Aggregation Characteristics
Yijie Yang(양 이지에),Jianxun Hou(호우 지엔쉰),Jaeyong Ko(고재용),Jeonghun Nam(남정훈),ChangBeom Kim(김창범),Sehyun Shin(신세현) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Red blood cell (RBC) aggregation is a hemorheological characteristic which plays an important role in microcirculation. This paper presents a new approach using optical method and shear stress-scanning mechanism to measuring RBC aggregation in varied shear flow. The backscattered light intensity and shear stress were measured in a microchannel with respect to time. Then, the critical time and critical shear stress were introduced, as newly-proposed indexes of aggregation, after analysis of the time recording of the backscattered light intensity and shear stress. It is experimentally proven that the new indexes quantitatively represent the aggregation characteristics of RBC-plasma suspensions with varying fibrinogen concentrations. The present approach to measuring RBC aggregation offers a new concept in the study of hemorheology and has potential to be applied to basic science research and point-of-care use.