An In Vitro Comparative Study of St. Jude Medical and Edwards-Duromedics Bileaflet Valves Using Laser Anemometry

Fatemi, Reza; Chandran, K. B.

doi:10.1115/1.3168382

Cited by 21 publications

(12 citation statements)

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“…Therefore, it may be considered favorable to the VAD design. Although there is still a conflict between researchers regarding the advantage of any of the MHV type implanted in the natural heart, 10,14,33 in the configuration of VAD both our results and the experiments by Yin et al found the monoleaflet valve (placed in an S-shape conduit) to be beneficial over the bileaflet valve.…”

Section: Discussioncontrasting

confidence: 58%

The Hemodynamics of the Berlin Pulsatile VAD and the Role of its MHV Configuration

2006

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The 3D flow in a model of the Berlin ventricular assist device (VAD) chamber with monoleaflet valves placed in S-shape conduits was simulated numerically. The blood flow dynamics were described in terms of flow patterns, velocity, pressure, and shear stress. The hemodynamic properties and the VAD's potential risk for thrombosis were evaluated in terms of mixing and washout properties, and global estimations of platelet level of activation (LOA). In order to evaluate the role of valves on the flow in the chamber, the flow in a model with bileaflet valves in straight conduits was simulated and compared with the original case. The results showed that in both models a large rotating flow was developed in the chamber during filling. This vortex filled the entire chamber and moved constantly up to the peak ejection phase, resulting in relatively low shear stress (up to 0.4 Pa) and no lasting stagnation regions. Significant shear stresses were found near the valves with higher values near the outlet valve in both models. The configuration of valves and conduits had a large effect on VAD washout and mixing properties, with advantage to the bileaflet model. However, since the bileaflet valves exhibited higher shear stresses, higher LOA were found for the bileaflet model.

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Section: Discussioncontrasting

confidence: 58%

The Hemodynamics of the Berlin Pulsatile VAD and the Role of its MHV Configuration

2006

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“…So far many studies for the improvement of the design of the mechanical heart valve prosthesis have been reported. Some of them are on the blood flow passing through the leaflet for a single cycle with inelastic artery wall [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of a bileaflet mechanical heart valve prosthesis with curved leaflet

Kwon

2008

J Mech Sci Technol

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Structural analysis, especially the thickness effect on the structural strength, of a bileaflet mechanical heart valve prosthesis with curved leaflets is presented in this paper. Taking the wide variations of the blood flow pressure on the leaflet surface, the structural stresses inside the leaflet and deflections of the leaflet are investigated by adopting both linear and nonlinear structural analysis techniques for more accurate results comparison. The thickness of the curved leaflet also varies considerably from 0.50 mm to 0.75 mm by 0.05 mm. These are very useful for the design of the mechanical heart valve (MHV) prosthesis. Linear and nonlinear structural mechanic analyses for the leaflet of the MHV prosthesis are conducted to predict the structural strength variation of the leaflet as the leaflet thickness changes. Analysis results show that the structural strength of the leaflet decreases as the leaflet thickness becomes thinner and thinner, and the nonlinear structural behaviors of thin leaflets are very conspicuous for large applied blood pressures. Hence, these thin leaflets are not desirable for the in vivo use of the MHV prosthesis.

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“…However, this clinically accepted axiom has not been proved analytically as yet. Only one reference [3] showed that the curved leaflet geometry used in the Edwards Duromedics MHV prosthesis does not provide any fluid dynamic advantage. Hence, the purpose of this paper is to analytically prove and/or justify that the bileaflet MHV with flat leaflet geometry is structurally stronger than the bileaflet MHV prosthesis with curved leaflet geometry by using the numerical analysis method (i.e., FEM).…”

Section: Introductionmentioning

confidence: 98%

Numerical analysis for the structural strength comparison of St. Jude Medical and Edwards MIRA bileaflet mechanical heart valve prostheses

Kwon

2010

J Mech Sci Technol

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This paper presents a numerical analysis for the structural strength comparison of the St. Jude Medical bileaflet mechanical heart valve prosthesis with flat leaflet and the Edwards MIRA bileaflet mechanical heart valve prosthesis with curved leaflet. Computer aided engineering systems are used in the analysis. The blood fluid pressure is applied to both flat and curved leaflets of the bileaflet mechanical heart valve prostheses for the rigid body dynamic analysis to confirm the almost same dynamic characteristics of both flat and curved leaflet motions. Thereafter, using the same blood fluid pressure and dynamic characteristics of leaflet motions, structural mechanic analyses for both flat and curved leaflets of the mechanical heart valve prostheses are carried out to show quite different stress and deformation results, respectively. Conclusively, from the viewpoint of stress, it is revealed that the St. Jude Medical bileaflet mechanical heart valve prosthesis is structurally stronger and better than the Edwards MIRA bileaflet mechanical heart valve prosthesis. Computer aided engineering systems used in this comparative structural analysis are ADAMS for the rigid body dynamic analysis, and NISA for the structural mechanic analysis.

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An In Vitro Comparative Study of St. Jude Medical and Edwards-Duromedics Bileaflet Valves Using Laser Anemometry

Cited by 21 publications

References 0 publications

The Hemodynamics of the Berlin Pulsatile VAD and the Role of its MHV Configuration

The Hemodynamics of the Berlin Pulsatile VAD and the Role of its MHV Configuration

Structural analysis of a bileaflet mechanical heart valve prosthesis with curved leaflet

Numerical analysis for the structural strength comparison of St. Jude Medical and Edwards MIRA bileaflet mechanical heart valve prostheses

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