乳幼児期に拘束を受けた脳組織解析モデルにおける応力分布に及ぼす髄液要素の影響

抄録

The purpose of this study was to clarify the effect of cerebrospinal fluid elements on the brain stress model, in order to develop a tool to support the treatment of craniosynostosis using the finite element method. The growth of the brain was expressed by the thermal expansion. A soft solid element, which imitates cerebrospinal fluid, was introduced into the model consisting of brain, pia mater, arachnoid mater, dura mater and skull. The thermal expansion coefficient of the brain was set as 0.04049, which corresponds to a volumetric expansion of the brain of 1% when the pia mater element contacts the cerebrospinal fluid elements. As a result, a maximum stress of 2.588×10^-5 [MPa] was generated in the brain, and the stress on the brain element was reduced by introducing the cerebrospinal fluid elements. Here, the stress distribution of the cerebrospinal fluid elements was not uniform, due to the coarse meshing, resulting in the generation of the localized high stresses. Therefore, it would be necessary to improve the accuracy of the stress analysis model in the future.