摘要
目的 分析理想状态下主动脉瓣关闭机制。方法 建立理想的主动脉瓣模型,用几何学的方法对不同瓣叶情况下的瓣膜受力情况进行分析。结果 二叶瓣无法开放,不符合生理要求。四叶瓣完全开放后,瓣叶完全贴于瓣环,在血液返流的方向上没有受力面积,不利于瓣膜的关闭。三叶瓣在完全开放的状态下,在血液返流的方向上有一个大小较为合理的截面积,有利于瓣膜的闭合受力。结论 在完全开放状态下,主动脉瓣在血液返流方向上的截面积是其关闭动力的重要来源,从关闭角度来讲,三叶瓣是唯一理想的瓣膜。
Objective To analyse the closing mechanism of ideal aortic valve model. Methods An ideal aortic valve model was established, and the force on the valvular surface in different situations were analyzed with geometric method. Results Bicuspid valve was not a satisfactory valve because it could not open theoretically in the physical situation. The leaves of tetracuspid valve would be adhered to the valvular ring when the valve opened completely. Therefore, in the direction of blood regurgitation, there would be no area to sustain the force which was necessary for the closing of the valve. For the tricuspid valve, when the valve opened completely, there would be a suitable area on the valvular surface in the direction of blood regurgitation provided an essential resource to exert enough force for the valve closing. Conclusion When aortic valve opened completely, the area on the valvular surface in the direction of blood regurgitation provides an essential resource to exert enough force for the valve closing. From the point of valve closing, the tricuspid valve was the only physiologically rational valve.
