LASER ASSESSMENT OF LEAFLET CLOSING MOTION IN PROSTHETIC HEART-VALVES

被引：22

作者：

GUO, GX ^{[1
]}

XU, CC ^{[1
]}

HWANG, NHC ^{[1
]}

机构：

[1] MEMPHIS STATE UNIV,DEPT BIOMED ENGN,MEMPHIS,TN 38152

来源：

JOURNAL OF BIOMEDICAL ENGINEERING | 1990年 / 12卷 / 06期

关键词：

Heart valves; laser assessment; leaflet closure;

D O I：

10.1016/0141-5425(90)90057-T

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

The dynamics of leaflet motion in heart valve prostheses (HVP), and in particular the closing velocity, is believed to be related to the valve sound and possibly to the phenomenon of valve cavitation. This paper describes a non-intrusive laser sweeping technique enabling the study of leaflet motion. The principle of measurement and the equipment involved are presented, together with the results of two commerially available, 29 mm bileaflet mitral valves, a St. Jude Medical, and an Edwards Duromedic valve. Experiments were carried out in a pulsatile mock flow testing loop designed to mimic physiological pressure waveforms and ventricular contraction. Measurements of heart rate were made in the range 70-120 beats min-1, with a ventricular pressure slope range of 1800-5600 mm Hgs-1 and a cardiac output range of 5.0-7.5 litres min-1. Motion analysis of the measured data focuses on the velocity of the leaflet immediately before closure. © 1990.

引用

页码：477 / 481

页数：5