HYDRODYNAMIC FUNCTION OF 2ND GENERATION PORCINE BIOPROSTHETIC HEART-VALVES

被引：15

作者：

BUTTERFIELD, M ^{[1
]}

FISHER, J ^{[1
]}

KEARNEY, JN ^{[1
]}

DAVIES, GA ^{[1
]}

机构：

[1] UNIV LEEDS,DEPT MECH ENGN,LEEDS LS2 9JT,W YORKSHIRE,ENGLAND

来源：

JOURNAL OF CARDIAC SURGERY | 1991年 / 6卷 / 04期

关键词：

D O I：

10.1111/j.1540-8191.1991.tb00350.x

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

The hydrodynamic function and leaflet dynamics of second generation porcine valves prepared with low- or zero-pressure fixation have been studied and compared to first generation porcine bioprostheses, bileaflet, and tilting disc mechanical valves. The Carpentier-Edwards Supra-Annular and Hancock II valves showed lower pressure drops than the Medtronic Intact valve and first generation porcine valves, and comparable overall energy losses to mechanical valves at normal cardiac outputs. Only the zero-pressure fixed Intact valve showed synchronous leaflet opening. Delayed leaflet opening and high opening pressures were found in both low- and high-pressure fixed porcine valves. All porcine bioprostheses showed high open leaflet bending strains. Fixation of valve leaflets with "near zero" pressure fixation and a more physiological neutral geometry is necessary to ensure synchronous leaflet opening at low flows and a reduction in commissural bending strains.

引用

页码：490 / 498

页数：9

共 13 条

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