Hemodynamic Flow Characterization of St. Jude Medical Bileaflet Mechanical and Bioprosthetic Heart Valve Prostheses in a Left Ventricular Model via Digital Particle Image Velocimetry

Simple item page
dc.contributor.authorPierrakos, Olgaen
dc.contributor.committeecochairTelionis, Demetri P.en
dc.contributor.committeecochairVlachos, Pavlos P.en
dc.contributor.committeememberPyle, Robert Leeen
dc.contributor.committeememberBerry, Joelen
dc.contributor.departmentEngineering Science and Mechanicsen
dc.date.accessioned2014-03-14T20:31:52Zen
dc.date.adate2003-03-18en
dc.date.available2014-03-14T20:31:52Zen
dc.date.issued2002-11-15en
dc.date.rdate2004-03-18en
dc.date.sdate2003-02-18en
dc.description.abstractThe performance of the heart after a valve replacement operation will greatly depend on the flow character downstream the mitral valve thus a better understanding of the flow character is essential. Most in vitro studies of the flow downstream of a MHV have been conducted with the valve in the aortic position. Researchers reported detailed measurements most of which were obtained by Laser Doppler Velocimetry (LDV) in rigid models of the aorta. Digital Particle Image Velocimetry (DPIV) has also been utilized to reveal intricate patterns of interacting shed vortices downstream of the aortic valve. The orientation of the valves may considerably affect the flow development and slight difference may produce significant differences in the ventricular flow fields. Two orientations, respectively anatomical and anti-anatomical, of the St. Jude Medical (SJM) bileaflet valve are presented and compared with the SJM Biocor porcine valve, which served to more closely represent the natural valve. In this effort, we employ a powerful tool to monitor the velocity field in a flexible, transparent LV and study the evolution of large eddies and turbulence through a complete cardiovascular cycle. Both time average and instantaneous results of velocity, vorticity, and turbulent kinetic energy distributions are presented. The presence and location of vortical structures were deduced as well as the level of coherence of these structures. The presence of three distinct flow patterns were identified, by the location of vortical structures and level of coherence, for the three configurations corresponding to significant differences in the turbulence level distribution inside the LV.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-02182003-143111en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02182003-143111/en
dc.identifier.urihttp://hdl.handle.net/10919/31262en
dc.publisherVirginia Techen
dc.relation.haspartporcine_velocity.avien
dc.relation.haspartPierrakos_Thesis.pdfen
dc.relation.haspartold_anti_velocity.avien
dc.relation.haspartold_anat_velocity.avien
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSt. Jude Medicalen
dc.subjectorientationen
dc.subjectMechanical heart valvesen
dc.subjectvorticityen
dc.subjectTurbulenceen
dc.subjectDPIVen
dc.titleHemodynamic Flow Characterization of St. Jude Medical Bileaflet Mechanical and Bioprosthetic Heart Valve Prostheses in a Left Ventricular Model via Digital Particle Image Velocimetryen
dc.typeThesisen
thesis.degree.disciplineEngineering Science and Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 4 of 4
Name:
porcine_velocity.avi
Size:
29.02 MB
Format:
Unknown data format
Download
Thumbnail Image
Name:
Pierrakos_Thesis.pdf
Size:
10.54 MB
Format:
Adobe Portable Document Format
Download
Name:
old_anti_velocity.avi
Size:
28.31 MB
Format:
Unknown data format
Download
Name:
old_anat_velocity.avi
Size:
32.38 MB
Format:
Unknown data format
Download

Collections

Masters Theses