DIMENSIONS AND GEOMETRIC RELATIONSHIPS OF HUMAN AORTIC VALUE AS A FUNCTION OF PRESSURE
DIMENSIONS AND GEOMETRIC RELATIONSHIPS OF HUMAN AORTIC VALUE AS A FUNCTION OF PRESSURE
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DOI：
10.1161/01.res.35.6.871
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发表时间：
1974-01-01
影响因子：
20.1
通讯作者：
CLARK, RE
中科院分区：
文献类型：
--
作者：
SWANSON, WM;CLARK, RE
在开发改进的人工心脏瓣膜的持续努力中，进行了作为应力的函数的人类主动脉瓣的解剖结构的重新定义。从一系列硅橡胶瓣膜铸件中获得了人主动脉瓣的尺寸和几何关系，作为0 - 120 mm Hg主动脉内压的函数。阀区域的轴向长度被发现随压力的变化可以忽略不计，但在几何形状和角度尺寸的显着变化。瓣叶附接环在与从左心室道穿过主动脉的圆柱形表面相交的平面处形成椭圆形。从测量几何结构的应力考虑中进行的扣除表明，加载瓣叶是圆柱形表面的一部分。获得了该展开表面的方程，并使用100 mm Hg下的平均值确定了假体设计。瓣叶可展开到平面上，沿着初始圆柱形部分和平面接合表面之间的接合线的沿着部分进行切割。最佳瓣膜形状要求圆柱形瓣叶与中心轴之间的底角为70°（α =20-22°，其中α为瓣叶角度）。
In a continuing effort to develop improved prosthetic heart valves, a redefinition of the anatomy of the human aortic valve as a function of stress was undertaken. Dimensions and geometric relationships of the human aortic valve as a function of intraaortic pressure between 0 and 120 mm Hg were obtained from a series of silicone rubber valve casts. The axial length of the valve region was found to vary negligibly with pressure, but significant variations in geometry and angular dimensions were seen. The leaflet attachment annulus forms an ellipse at the plane of intersection with the cylindrical surface passing from the left ventricular tract through the aorta. Deductions from stress considerations for the measured geometry indicate that the loaded leaflet is a section of a cylindrical surface. The equation for this developed surface was obtained, and a prosthetic design was determined using average values at 100 mm Hg. The leaflet is developable onto a plane with a cut required along part of the junction line between the initially cylindrical part and the plane coapting surfaces. Optimum valve shape mandates a base angle between the cylindrical leaflet and the center axis of 70° (α =20-22°, where α is the leaflet angle).