J021011 偏光高速度カメラを用いたゼラチン脳内応力の光弾性解析

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  • J021011 Photoelastic analysis of stress in gelatin brain using high-speed polarized camera

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Shaken baby syndrome (SBS) is a type of traumatic brain injury caused by violent shaking of an infant head. It's characterized by some forms of intracranial damages such as subdural hemorrhage, gliding contusion, or diffuse axonal injury. However the mechanism of SBS is not yet clearly understood. In this study, we analyzed intracerebral stress distribution by photoelastic analysis using a two-dimensional sagittal-plane gelatin brain model to elucidate the mechanism underlying intracranial damages in SBS. We modified Holbourn's brain model and added the lateral ventricle. The device consisted of rotational table, green light source, linear polarizer, the gelatin model, and high speed polarized camera. The model oscillated rotationally in the sagittal direction with 60 degrees of central angle and 3Hz of frequency. The peak average values during flexion (negative value) and extension (positive value) of sagittal linear acceleration, angular velocity and angular acceleration were -1.31G, 1.24G, -3.93rad/s, 5.75rad/s, -148.64rad/s^2, 107.06rad/s^2, respectively. In color image for retardation indicating stress generations, stress wave began to appear in the parietal region near the brain surface and the deep region of the brain, after that before full flexion of the model, stress concentration could be observed in the parietal region near the brain surface, midbrain and the corpus callosum. These results suggest the mechanism of occurrence of subdural hemorrhage, brain damage such as gliding contusion or diffuse axonal injury in SBS.

収録刊行物

  • 年次大会

    年次大会 2012 (0), _J021011-1-_J021011-4, 2012

    一般社団法人 日本機械学会

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