Dynamic analysis of flutter in disk type mechanical heart valve prostheses

Hemolytic and subhemolytic blood damage by mechanical heart valve prostheses have been observed in both clinical and in vitro investigations. A direct comparison between these studies is not possible. Nevertheless the transfer of some in vitro results to the behaviour of the valve in situ may be performed considering the similarity principle. This requires the use of dimensionless similarity numbers such as the plasma's hemoglobin concentration (PHb) or others, instead of dimensioned parameters. To evaluate the in vitro hemolysis of valve prosthesis a test chamber filled with human banked blood was used. An artificial ventricle ensuring an oscillatory flow through the valve was also used. The rise of PHb was evaluated in terms of a similarity number, called the lysis number. This number describes the probability of destroying a single red blood cell participating once in the hemolytic process under consideration. The lysis number, a Björk-Shiley valve (TAD 29), was found to be in the order of 2 × 10−4. From this, the survival time of erythrocytes in patients with an artificial heart valve was estimated. It was found to be in the order of 20 d of T50 Cr in agreement with clinical results

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Does the noise of mechanical heart valve prostheses affect quality of life as measured by the SF-36® questionnaire?

European Journal of Cardio-Thoracic Surgery ◽

10.1016/s1010-7940(03)00172-6 ◽

2003 ◽

Vol 24 (1) ◽

pp. 52-58 ◽

Cited By ~ 17

Author(s):

H Koertke

Keyword(s):

Quality Of Life ◽

Heart Valve ◽

Mechanical Heart Valve ◽

Heart Valve Prostheses ◽

Sf 36 ◽

Valve Prostheses

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Closure Mechanics of Mechanical Heart Valve Prostheses – Experimental and Computational Analysis

IFMBE Proceedings - International Conference on Advancements of Medicine and Health Care through Technology ◽

10.1007/978-3-642-04292-8_80 ◽

2009 ◽

pp. 363-368

Author(s):

A. Turcu ◽

A. Lungu ◽

S. Vlad ◽

D. Rafiroiu ◽

R. V. Ciupa ◽

...

Keyword(s):

Heart Valve ◽

Computational Analysis ◽

Mechanical Heart Valve ◽

Heart Valve Prostheses ◽

Valve Prostheses

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Safety of low intensity warfarin regimen in Chinese patients With mechanical heart valve prostheses

Journal of Thrombosis and Haemostasis ◽

10.1111/j.1538-7836.2003.tb05603.x ◽

2003 ◽

Vol 1 ◽

pp. P1953-P1953

Author(s):

S. El Rouby ◽

L. Chan ◽

F. M. Laduca ◽

M. L. Zucker ◽

Keyword(s):

Heart Valve ◽

Mechanical Heart Valve ◽

Chinese Patients ◽

Heart Valve Prostheses ◽

Low Intensity ◽

Valve Prostheses

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A Comparative Study of Structural Analyses for Flat and Curved Mechanical Heart Valve Prostheses to Enhance Durability

Advances in Bioengineering ◽

10.1115/imece2003-41184 ◽

2003 ◽

Cited By ~ 1

Author(s):

Young Joo Kwon

Keyword(s):

Comparative Study ◽

Heart Valve ◽

Dynamic Characteristics ◽

Mechanical Heart Valve ◽

Rigid Body Dynamics ◽

Valve Prosthesis ◽

Fluid Force ◽

Heart Valve Prostheses ◽

Valve Prostheses ◽

Dynamics Analyses

This paper addresses a comparative study of structural analyses for flat and curved mechanical heart valve prostheses. The same fluid force computed by the fluid mechanics analysis for the blood flow passing through the leaflets of a bileaflet mechanical heart valve prosthesis is used to both flat and curved mechanical heart valve prostheses for comparison. This fluid force is applied to both mechanical heart valve prostheses for the rigid body dynamics analyses to confirm the kinematic and dynamic characteristics of leaflet motions, the structural mechanics analyses for deformed leaflets of both flat and curved mechanical heart valve prostheses are executed to give quite different stress and deflection results even though they have the almost same kinematic and dynamic characteristics.

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