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

Vennemann, Bernhard Martin; Rösgen, Thomas; Carrel, Thierry; Obrist, Dominik (2016). Time-Resolved Micro PIV in the Pivoting Area of the Triflo Mechanical Heart Valve. Cardiovascular Engineering and Technology, 7(3), pp. 210-222. Springer 10.1007/s13239-016-0264-z

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > ARTORG Center for Biomedical Engineering Research > ARTORG Center - Cardiovascular Engineering (CVE)
04 Faculty of Medicine > Department of Cardiovascular Disorders (DHGE) > Clinic of Cardiovascular Surgery

UniBE Contributor:

Vennemann, Bernhard Martin; Carrel, Thierry and Obrist, Dominik

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1869-408X

Publisher:

Springer

Language:

English

Submitter:

Daniela Huber

Date Deposited:

25 Jul 2016 16:02

Last Modified:

25 Aug 2016 01:31

Publisher DOI:

10.1007/s13239-016-0264-z

PubMed ID:

27177747

Uncontrolled Keywords:

Gap flow; Hemodynamics; High-speed imaging; Mechanical heart valve; Particle image velocimetry; Shear stress; Triflo furtiva valve; μPIV

BORIS DOI:

10.7892/boris.84064

URI:

https://boris.unibe.ch/id/eprint/84064

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