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The Effect of Compliance Structures Near the Mechanical Heart Valve on Valve Surface Erosion  

Lee, Hwan-Sung (Department of Biomedical Engineering, Korea University Medical Center)
Hwang, Sung-Won (Department of Mechanical Engineering, Graduate School of Engineering, Chonbuk National University)
Sun, Kyung (Department of Thoracic and Cardiovascular Surgery Korea University, Medical Center)
Publication Information
Journal of Biomedical Engineering Research / v.23, no.4, 2002 , pp. 309-315 More about this Journal
Abstract
Since the discovery, in the 1980s, of erosion-pit-induced fractures in implanted mechanical heart valves. cavitation on the surface of mechanical heart valves has been widely studied as a possible cause of pitting. Several factors, including peak dp/dt of the ventricular pressure. maximum closing velocity of the leaflet, and squeeze flow. have been studied as indices of the cavitation threshold. In the present study. cavitation erosion on the surface of a mechanical valve was examined by focusing on squeeze flow and the water hammer phenomenon during the closing period of the valve. In this study, we measures pressure wave forms near a valve and closing velocities of a disk, which were placed in a holder with and without compliance. In case of all holders, pressure drop of below vapor pressure expect at near the surface disk. It was also found that the closing velocity of the disk increased and that cavitation erosion was enhanced too. These results suggest that disk closing velocity during the closing phase has signifiant effects on pitting erosion.
Keywords
Mechanical heart valve; Cavitation erosion; Closing velocity; Compliance structure;
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  • Reference
1 Cavitation /
[ R.T. Knapp;J.W. Daily;F.G. Hammitt ] / Iowa City, Instutite of Hydraulic Research
2 Cavitation dynamics of Mechanical heart vavle prostheses /
[ C.S. Lee;K.B. Chandran;L.D. Chen ] / Artif Organs   DOI   ScienceOn
3 Causes and formation of cavitation in mechanical heart valve /
[ T. Graf;H. Reul;C. Detlefs;R. Wilmes;G. Rau ] / J Heart Valve Disease
4 Leaflet fracture in Edwards Duromedics bileaflet valves /
[ W. Klepetko;A. Moritz;J. Mlczoch;H. Schurawitzki;E. Domanig;E. Wolner ] / J Thorac. Cardiovasc. Surg
5 Control of structure of carbon for use in bioengineering /
[ J.C. Bokros;L.D. LaGrange;F.J. Schoen ] / Chemistry and Physics of Carbon
6 Cavittion dynamics of Medtronic Hall mechanical heart valve prosthesis:fluid squeezing effect /
[ C.S. Lee;K.B. Chandran;L.D. Chen ] / J Biomech Engineering   DOI   ScienceOn
7 Transient pressure at closing of a monoleaflet mechanical heart valve prosthesis: Mounting compliance effect /
[ Z.J. Wu;B.Z. Gao;N.H.C. Hwang ] / J Heart Valve Disease
8 In vitro observations of mechanical heart valve cavitation /
[ M.C.S. Shu;L.H. Leuer;T.L. Armitage;T.E. Schneider;D.R. Christiansen ] / J Heart Valve Disease
9 Surface pitting of heart valve disks tested in an accelerated fatigue tester /
[ H.S. Lee;T. Shimooka;Y. Mitamura;K. Yamamoto;T. Yuhta ] / Frontiers Med. Biol. Engng   DOI   ScienceOn
10 Occluder closing behavior: A key factor in mechanical heart valve cavitation /
[ Z.J. Wu;Y. Wang;N.H.C. Hwang ] / J Heart Valve Disease
11 An experimental- computational analysis of MHV cavitation: Effect of leaflet squeezing and rebound /
[ V.B. Makhijani;H.Q. Yang;A.K. Singhal;N.H.C. Hwang ] / J Heart Valve Disease