Manufacturing and Performance Evaluation of Polyurethane Artificial Heart Valve

• Main Authors: Ruei-Lang Chen, 陳瑞龍
• Other Authors: Pong-Jeu Lu
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/04756969550293361010

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 91 === A modified Jellyfish valve was designed based on the original Jellyfish valve and fluid dynamic consideration. The new design reduced the number of spokes positional in the central flow region and adopted elliptic cross sections to make the spokes more streamline shaped. In order not to make the valve membrane prolapse during the diastole phase, a sinus was added at the outlet of the Jellyfish valve. This idea not only increases the supporting area of the membrane, but helps the membrane to close earlier so that the regurgitation is minimized. Experiments were conducted to evaluate the homodynamic performances of the two Jellyfish valves. In the steady-state flow test, the Effective Orifice Area (EOA) has been shown almost doubled with the modified design for flowrate up to 24 L/min. Unsteady experiment using pulse duplicator were also performed for Medtronic Hall, Jellyfish and modified Jellyfish valves. It was found that , for flowrate less than 5 L/min , Medtronic Hall Valve has larger EOA and regurgitation flow as compared to the two Jellyfish valves . Moreover, in this low flowrate range, the modified Jellyfish valve enjoys larger EOA but comparable regurgitation flow as compared to those of the original design. As a result, it is justified in the present research that the strategies proposed to modify the Jellyfish valve are feasible and effective.