ディスク型人工弁の流体力学的研究 : 装着方向の違いによる影響について

概要

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Three tilting disc mechanical heart valves (Bjork-Shiley c-c, Bjork-Shiley monostrut and Bicer-Val) have been tested in the mitral position under pulsatile flow conditions. The test program included measurements of velocity and turbulent stresses at six downstream locations. The study was carried out using a sophisticated cardiac simulator in conjunction with a highly sensitive two-component laser Doppler anemometer system. The continuous monitoring of parametric time histories revealed useful details about the complex flow and helped establish the location and time of the peak parameter values. Based on the nondimensional presentation of data, the following general conclusions can be made : (i) all 3 valve designs created elevated turbulent stresses during acceleration and peak flow phase presenting a possibility of thromboembolism, and perhaps, hemolysis ; (ii) flow characteristics are affected by the maximum opening angles of each valve ; and (iii) posterior orientation generates less turbulent stress than anterior orientation.
一般社団法人日本機械学会の論文
1994-09-25