損傷形態を考慮した肝臓傷害耐性の検討(<特集>D&D2009)

概要

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Injury tolerance has been actively researched as a part of establishing injury criterion of internal organs and application to a simulation model. Mechanical response of the internal organs removed from a cadaver has been often measured by direct compression using a rigid body. However, it is shown that the injury pattern is significantly different between direct impact and indirect impact through soft tissue like muscle and fat. To measure the mechanical response of the liver in the state that load transfer approached in vivo, we conducted an impact test using an abdominal model of a liver surrounded by two groups of muscles, which was removed from a porcine trunk. An impact testing machine utilizing a torsion spring as the energy source and a slider crank mechanism makes it possible to launch an impactor into the abdominal model. Then, deformation volume of only the liver and the hepatic surface pressure were measured using an ultrasonic device and a contact pressure transducer with little influence on the liver behavior. In the result, liver was damaged over 40% maximum compression ratio, and injury scale was proportional to maximum compression ratio. Our experiment shows that the injury pattern in this test was close to that in a traffic accident, and there was high correlation between injury scale and maximum compression ratio.
2010-05-25