許多的統計資料指出，心血管疾病是現代人死亡原因的前幾名，而心臟瓣膜的疾病就是其中的一種，然而目前之人工機械心瓣仍存在有穴蝕的問題，會造成血球的破壞、形成血栓。本研究利用體外脈動流循環模擬系統，裝設兩種不同的人工機械心瓣，St. Jude. Medical 29和Omniscience 29進行模擬，並以高頻率壓力計及雷射都卜勒測速儀量測其關閉時之流場狀況。由壓力量測結果發現，人工機械心瓣產生穴蝕現象之原因，並非單純由水錘效應所造成；而由雷射都卜勒測速儀的結果則發現，渦流的影響亦只佔其中之ㄧ部分。 A lot of data show that cardiovascular diseases plays an important role of death of modern people, and heart valve disease is one kind of them. Until now, implantation of mechanical heart valves still has the problem of cavitation, and it may cause blood damage and thrombosis. This study uses two kinds of mechanical heart valves St. Jude Medical 29 and Omniscience 29 with the pulsatile circularity system, and measures the flow fields during valve closure with PCB pressure sensor and laser Doppler velocimetry. The result shows that only water hammer effect or the vortex would not be strong enough to cause cavitation.
