An In Vitro Study of the Hinge and Near-Field Forward Flow Dynamics of the St. Jude Medical® Regent™ Bileaflet Mechanical Heart Valve

10.1114/1.297 ◽  
2000 ◽  
Vol 28 (5) ◽  
pp. 524-532 ◽  
Author(s):  
Jeffrey T. Ellis ◽  
Brandon R. Travis ◽  
Ajit P. Yoganathan
Keyword(s):  
Heart Valve ◽  
Near Field ◽  
Mechanical Heart Valve ◽  
In Vitro Study ◽  
Flow Dynamics ◽  
Vitro Study ◽  
Forward Flow ◽  
Jude Medical ◽  
Bileaflet Mechanical Heart Valve

scholarly journals Near Valve Flows and Potential Blood Damage During Closure of a Bileaflet Mechanical Heart Valve

2011 ◽  
Vol 133 (9) ◽  
Author(s):  
L. H. Herbertson ◽  
S. Deutsch ◽  
K. B. Manning
Keyword(s):  
Heart Valve ◽  
Heart Valves ◽  
Mechanical Heart Valve ◽  
In Vitro Study ◽  
Blood Damage ◽  
Bileaflet Mechanical Heart Valve ◽  
Fluid Velocities ◽  
Design Characteristics ◽  
Valve Housing

Blood damage and thrombosis are major complications that are commonly seen in patients with implanted mechanical heart valves. For this in vitro study, we isolated the closing phase of a bileaflet mechanical heart valve to study near valve fluid velocities and stresses. By manipulating the valve housing, we gained optical access to a previously inaccessible region of the flow. Laser Doppler velocimetry and particle image velocimetry were used to characterize the flow regime and help to identify the key design characteristics responsible for high shear and rotational flow. Impact of the closing mechanical leaflet with its rigid housing produced the highest fluid stresses observed during the cardiac cycle. Mean velocities as high as 2.4 m/s were observed at the initial valve impact. The velocities measured at the leaflet tip resulted in sustained shear rates in the range of 1500–3500 s−1, with peak values on the order of 11,000–23,000 s−1. Using velocity maps, we identified regurgitation zones near the valve tip and through the central orifice of the valve. Entrained flow from the transvalvular jets and flow shed off the leaflet tip during closure combined to generate a dominant vortex posterior to both leaflets after each valve closing cycle. The strength of the peripheral vortex peaked within 2 ms of the initial impact of the leaflet with the housing and rapidly dissipated thereafter, whereas the vortex near the central orifice continued to grow during the rebound phase of the valve. Rebound of the leaflets played a secondary role in sustaining closure-induced vortices.

scholarly journals Mitral Prosthesis Opening and Flow Dynamics in a Model of Left Ventricle: An In Vitro Study on a Monoleaflet Mechanical Valve

2005 ◽  
Vol 5 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Frederic Mouret ◽  
Lyes Kadem ◽  
Eric Bertrand ◽  
Jean G. Dumesnil ◽  
Philippe Pibarot ◽  
...  
Keyword(s):  
Left Ventricle ◽  
In Vitro Study ◽  
Mechanical Valve ◽  
Flow Dynamics ◽  
Vitro Study ◽  
Mitral Prosthesis

Impact of hypertension on bioprosthetic heart valve calcification – a short-term in vitro study

2012 ◽  
Vol 60 (S 01) ◽  
Author(s):  
M Schleicher ◽  
T Schlichthärle ◽  
JG Mannheim ◽  
A Pfäfflin ◽  
M Schmauder ◽  
...  
Keyword(s):  
Heart Valve ◽  
In Vitro Study ◽  
Vitro Study ◽  
Bioprosthetic Heart Valve ◽  
Short Term ◽  
Valve Calcification

Innovative, Replaceable Heart Valve: Concept, In Vitro Study, and Acute In Vivo Study

2008 ◽  
Vol 32 (3) ◽  
pp. 226-229 ◽  
Author(s):  
Kiyotaka Fukamachi ◽  
Yoshio Ootaki ◽  
Chiyo Ootaki ◽  
Masatoshi Akiyama ◽  
Keiji Kamohara ◽  
...  
Keyword(s):  
Heart Valve ◽  
In Vitro Study ◽  
Vitro Study ◽  
In Vivo Study
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