脳動脈瘤クリップの把持力評価とレーザ加工された把持面の摩擦特性評価(機械要素,潤滑,設計,生産加工,生産システムなど)

概要

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A cerebral aneurysm is the dilation, bulging, or ballooning out of part of the wall of a vein or artery in the brain. If the cerebral aneurysm ruptures, it will become serious life-threatening condition. An aneurysm clip is a medical instrumentation that is used in operation of the cerebral aneurysm to clip the ruptured aneurysm and to reduce the risk of rebleeding. In order to prevent the aneurysm clips from slipping out of the blood vessels, a number of pyramidal depressions are formed on their clamp surfaces. Generally friction forces are determined by the normal load applied on the frictional surface and friction coefficient of the mating surfaces. In this study, load-displacement characteristics of the aneurysm clips were theoretically obtained based on the curved beam theory. The existing pyramidal depressions of the aneurysm clips increased the friction coefficient on the clamp surfaces. However, it is not verified whether the form of pyramidal depression is optimum or not. We used a THG laser process machine to produce the clamp surface with circular depressions or grooves. Frictional characteristic of each clamp surface was examined.
2010-10-25