グリーンフィールド下大静脈フィルターの機械特性の数値解析(機械力学,計測,自動制御)

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A vena cava filter is a device inserted percutaneously into a major vein to prevent a blood clot from entering the lungs. A thrombus clot traveling to the lungs is called a pulmonary embolism. Many types of vena cava filters, such as the Greenfield filter, are available. Although their insertion seems to be a safe and effective method to prevent recurrence of pulmonary embolisms, patients in whom the filter has become tilted may experience pulmonary embolism recurrence because of a decrease in the filter's thrombus-trapping performance. However, there are little quantitative data about the mechanical properties of these filters, such as the ease of filter delivery. In this study, we therefore evaluated the mechanical properties of the Greenfield filter by numerical analysis. This model of filter is constructed with viscoelastic springs and segments for the dynamic deformation of a flexible structure. The blood vessel is an elastic tube. The contact forces between the filter and the vessel are calculated according to the stiffness and friction of the vessel wall. Using these models, the position and the configuration of the filter were calculated to represent the deployment of a Greenfield filter inside the blood vessel and its prsence for a fixed time under a constant force. When the introducer catheter does not align with the axis of the vena cava, the inserted filter tilts. When the filter does not expand uniformly, the inserted filter tilts as well.
社団法人日本機械学会の論文
2009-04-25

グリーンフィールド下大静脈フィルターの機械特性の数値解析(機械力学,計測,自動制御)

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