嚥下シミュレーションと呼吸シミュレーションの統合

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  • Biomechanical Simulation Integrating Swallowing and Breathing

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<p>The breath is to inhale and exhale the air from the nose or mouth to the lung through the throat. Swallowing is to transport food from the mouth to the esophagus via the throat. That means the throat has an intrinsic risk to be obstructed by food known as suffocation or to transport food to the lung as a mistake occurring aspiration pneumonia. In order to avoid both of suffocation and aspiration, breathing and swallowing must act under a precise coordination mechanism to fulfill each function. However, the mechanism has never been revealed yet, since even the latest medical imaging technology cannot visualize the whole motion of the breathing and swallowing at all. The purpose of this study is to produce a numerical simulation model that integrates breathing with swallowing and is to visualize the whole movement of the breathing and swallowing to clarify the coordination mechanism. First, we combined two numerical models of Lung 4Cer CFD for breathing and Swallow Vision® for swallowing. The two models were connected at the larynx of Swallow Vision®. Then the connected model had anatomical structures of the mouth, throat and esophagus as well as trachea, bronchi and lung. To validate the connected model, the lung movement and the airflow during breathing were analyzed. As a result, the flow rate of inflow/outflow surface was confirmed to equal the volume change of the lung.</p>

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