Electrical and Optical Properties of Flowing Blood.
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概要
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The effects of flow on the changes of electrical resistivity of blood were experimentally and theoretically discussed. Studies indicated that most erythrocytes deform and orient themselves in the flow direction when blood flows. Such oriented blood shows anisotropic physical properties. Anisotropic electrical resistivity of flowing blood was measured in three rectangular directions with a measurement cell of coaxial cylindrical type. A fresh whole blood, an erythrocytes suspension in saline and a hardened erythrocytes suspension in saline were used as samples. From these experimental results, the orientation and the deformation of erythrocytes were discussed. For whole blood 45% in hematocrit, the anisotropy increased with the increase of shear rate and approached a saturation state, and the saturation values of resistivity were about 20% higher than the initial value in the radial direction, and about 15% lower than the initial value in the circumferential and axial directions respectively. The erythrocyte suspension in saline showed anisotropic resistivity even at rest. The resistivity of hardened blood did not depend on the shear rate of flow. The orientation ratio and the deformation were calculated with a simplified spheroidal model of an erythrocyte. The result for whole blood showed that both the fractions of erythrocytes with their short axis parallel to each direction and the equivalent axis ratio for a simplified spheroidal model changed with the shear rate of flow. However calculated results of hardened blood coincided well with the Jefferys' theory. These results suggested that not only the orientation but also the deformation of erythrocytes are very important for the analysis of physical properties of flowing blood.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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