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A Phospholipid-modified Polystyrene—Polyisobutylene— Polystyrene (SIBS) Triblock Polymer for Enhanced Hemocompatibility and Potential Use in Artificial Heart ValvesDepartment of Biomedical Engineering, Florida International University, Miami, Florida, USA, ndura002{at}fiu.edu, nandvish{at}yahoo.com
Department of Biomedical Engineering, Florida International University, Miami, Florida, USA
Innovia LLC, Miami, Florida, USA
College of Engineering, University of Texas at El Paso El Paso, Texas, USA Poly(styrene-block-isobutylene-block-styrene) (`SIBS') is selected for a novel trileaflet heart valve due to its high resistance to oxidation, hydrolysis, and enzyme attack. SIBS is modified using six different phospholipids and its mechanical properties characterized by tensile stress, peel strength, shear strength, contact angle, and surface energy, and then for hemocompatibility by studying the adhesion of fluorescently labeled platelets in a parallel plate chamber under physiological flow conditions. Phospholipid modification decreases SIBS tensile stress (at 45% strain) by 30% and reduces platelet adhesion by a factor of 10, thereby improving its hemocompatibility and its potential use as a synthetic heart valve.
Key Words: SIBS phospholipids platelets biomaterial synthetic heart valve hemocompatibility.
This version was published on January
1, 2009 Journal of Biomaterials Applications, Vol. 23, No. 4,
367-379 (2009) |
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