LEAFLET GEOMETRY AND FUNCTION IN PORCINE BIOPROSTHESES

被引：12

作者：

BUTTERFIELD, M

FISHER, J

DAVIES, GA

KEARNEY, JM

机构：

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

[2] KILLINGBECK HOSP,CARDIAC RES UNIT,LEEDS,ENGLAND

[3] PINDERFIELDS HOSP,REG TISSUE BANK,WAKEFIELD,ENGLAND

来源：

EUROPEAN JOURNAL OF CARDIO-THORACIC SURGERY | 1991年 / 5卷 / 01期

关键词：

PORCINE BIOPROSTHESES; LEAFLET GEOMETRY FUNCTION;

D O I：

10.1016/1010-7940(91)90079-Y

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

The leaflet geometry and hydrodynamic function of five porcine bioprostheses have been studied and compared to a fresh tissue porcine valve. The neutral leaflet geometries in two high pressure fixed valves (Carpentier Edwards and Hancock) and two low pressure fixed valves (Carpentier Edwards Supra-Annular and Hancock 2) had been modified during fixation and mounting. The leaflets were extended or displaced downwards towards the base of the valve, producing a higher ratio of circumferential leaflet length to inter-commissural spacing than in the fresh tissue valve. This produced high bending strains in the commissural area of the open leaflet in hydrodynamic tests. The leaflet geometry of the fresh tissue porcine valve studied was defined by a cylindrical shell inclined at approximately 27-degrees to the base of the valve and showed reduced open leaflet bending strains. Leaflet opening at low flows was dependent on leaflet geometry. Geometrical changes which are induced during mounting and fixation produced higher bending strains in the commissural area of the open leaflets. These may be contributing factors to tissue degeneration and calcification in this area.

引用

页码：27 / 33

页数：7

共 19 条

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