ATTENUATION OF FLOW DISTURBANCES IN TAPERED ARTERIAL GRAFTS

被引:17
作者
BLACK, RA [1 ]
HOW, TV [1 ]
机构
[1] UNIV LIVERPOOL, INST MED & DENT BIOENGN, LIVERPOOL L69 3BX, ENGLAND
来源
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME | 1989年 / 111卷 / 04期
关键词
D O I
10.1115/1.3168383
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Flow disturbances in tapered arterial grafts of angles of taper between 0.5 and 1.0 deg were measured in vitro using a pulsed ultrasound Doppler velocimeter. The increase in transition Reynolds numbers with angle of taper and axial distance was determined for steady flow. The instantaneous centerline velocities were measured distal to a 50 percent area stenosis (as a model of a proximal anastomosis), in steady and pulsatile flow, from which the disturbance intensities were calculated. A significant reduction in post-stenotic disturbance intensity was recorded in the tapered grafts, relative to a conventional cylindrical graft. In pulsatile flow with a large backflow component, however, there was an increase in disturbance intensity due to diverging flow during flow reversal. This was observed only in the 1.0 deg tapered graft. These findings indicate that taper is an important consideration in the design of vascular prostheses.
引用
收藏
页码:303 / 310
页数:8
相关论文
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WALBURN, FJ ;
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JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME, 1981, 103 (02) :116-120
[32]  
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