高速押し込みによる大脳表層部の力学特性評価

概要

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Recently, brain injury has been mainly analyzed by computer simulation. However, simulation model of brain needed to obtain accurate analysis results has been shown variety of values. Simulation model reproduced deformational behavior of brain with velocity has not been built. We obtained relaxation curve from hemisphere indentation test for cerebral surface using our own experiment setup, and calculated shear modulus and viscosity. We built viscoelastic model of cerebral surface and evaluated effect of velocity, sites, and leptomeninx on mechanical properties. Our experiment showed that short term shear modulus with leptomeninx was approximately 1.4 times higher values than it without leptomeninx, and viscosity value in high speed range was lower than slow speed. We evinced that brain tissue depends on velocity on high speed range, and leptomeninx affects a rigidity of cerebral surface. Additionally, we confirmed that our viscoelastic model is numerically able to reproduce deformational behavior of brain on high speed range, and acquired parameter values for functions of viscoelastic model.