Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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PIV Measurements of Flow Downstream of Polyurethane Heart Valve Prosthesis for Artificial Heart: Pulsatile Flow Experiment

PIV를 이용한 인공심장용 폴리우레탄 인공판막 하류의 유동 측정 : 맥동유동실험

  • 유정열 (서울대학교 기계항공공학부) ;
  • 김중경 ((주)바이오메드랩) ;
  • 성재용 ((주)LG전자) ;
  • 장준근 (서울대학교 전기컴퓨터공학부) ;
  • 민병구 (서울대학교 의과대학 의공학교실, 서울대학교 의학연구원 의용생체공학연구소)
  • Published : 2002.05.01
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Abstract

In-vitro flow characteristics downstream of a polyurethane artificial heart valve and a Bjork-Shiley Monostrut mechanical valve have been comparatively investigated in pulsatile flow using particle image velocimetry (PIV). With a triggering system and a time-delayed circuit the velocity distributions on the two perpendicular measurement planes downstream of the valves are evaluated at any given instant in conjunction with the opening behaviors of valve leaflets during a cardiac cycle. The regions of stasis and high shear stress can be found simultaneously by examining the entire view of the instantaneous velocity and Reynolds shear stress fields. It is known that high shear stress regions exist at the interface between strong axial jet flows along the wall and vortical flows in the central area distal to the valves. In addition. there are large stagnation or recirculation regions in the vicinity of the valve leaflet, where thrombus formation can be induced by accumulation of blood elements damaged in the high shear stress zones. A correlation between the unsteady flow patterns downstream of the valve and the corresponding opening postures of the polyurethane valve membrane gives useful data necessary for improved design of the frame structure and leaflet geometry of the polyurethane valve.

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References

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