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Time-Resolved Micro PIV in the Pivoting Area of the Triflo Mechanical Heart Valve

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Abstract

The Lapeyre-Triflo FURTIVA valve aims at combining the favorable hemodynamics of bioprosthetic heart valves with the durability of mechanical heart valves (MHVs). The pivoting region of MHVs is hemodynamically of special interest as it may be a region of high shear stresses, combined with areas of flow stagnation. Here, platelets can be activated and may form a thrombus which in the most severe case can compromise leaflet mobility. In this study we set up an experiment to replicate the pulsatile flow in the aortic root and to study the flow in the pivoting region under physiological hemodynamic conditions (CO = 4.5 L/min / CO = 3.0 L/min, f = 60 BPM). It was found that the flow velocity in the pivoting region could reach values close to that of the bulk flow during systole. At the onset of diastole the three valve leaflets closed in a very synchronous manner within an average closing time of 55 ms which is much slower than what has been measured for traditional bileaflet MHVs. Hot spots for elevated viscous shear stresses were found at the flanges of the housing and the tips of the leaflet ears. Systolic VSS was maximal during mid-systole and reached levels of up to 40 Pa.

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Acknowledgments

The authors would like to thank Triflo Medical Switzerland Sarl for providing us with the Lapeyre-Triflo FURTIVA valve used in this project.

Conflict of Interest

Bernhard M. Vennemann, Thomas Rösgen, Thierry P. Carrel and Dominik Obrist declare that they have no conflict of interest.

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No human and animal studies were carried out by the authors for this article.

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Correspondence to Bernhard M. Vennemann.

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Associate Editor Ajit P. Yoganathan oversaw the review of this article.

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Vennemann, B.M., Rösgen, T., Carrel, T.P. et al. Time-Resolved Micro PIV in the Pivoting Area of the Triflo Mechanical Heart Valve. Cardiovasc Eng Tech 7, 210–222 (2016). https://doi.org/10.1007/s13239-016-0264-z

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  • DOI: https://doi.org/10.1007/s13239-016-0264-z

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