Two different aortic prostheses can be used for performing the Bentall procedure: a standard straight graft and the Valsalva graft that better reproduces the aortic root anatomy. The aim of the present work is to study the effect of the graft geometry on the blood flow when a bileaflet mechanical heart valve is used, as well as to evaluate the stress concentration near the suture line where the coronary arteries are connected to graft. An accurate three-dimensional numerical method is proposed, based on the immersed boundary technique. The method accounts for the interactions between the flow and the motion of the rigid leaflets and of the deformable aortic root, under physiological pulsatile conditions. The results show that the graft geometry only slightly influences the leaflets dynamics, while using the Valsalva graft the stress level near the coronary-root anastomoses is about half that obtained using the standard straight graft.

Fluid–structure interaction of deformable aortic prostheses with a bileaflet mechanical valve / DE TULLIO, Marco Donato; Afferrante, Luciano; Demelio, Giuseppe Pompeo; Pascazio, Giuseppe; Verzicco, R.. - In: JOURNAL OF BIOMECHANICS. - ISSN 0021-9290. - 44:9(2011), pp. 1684-1690. [10.1016/j.jbiomech.2011.03.036]

Fluid–structure interaction of deformable aortic prostheses with a bileaflet mechanical valve

DE TULLIO, Marco Donato;AFFERRANTE, Luciano;DEMELIO, Giuseppe Pompeo;PASCAZIO, Giuseppe;
2011-01-01

Abstract

Two different aortic prostheses can be used for performing the Bentall procedure: a standard straight graft and the Valsalva graft that better reproduces the aortic root anatomy. The aim of the present work is to study the effect of the graft geometry on the blood flow when a bileaflet mechanical heart valve is used, as well as to evaluate the stress concentration near the suture line where the coronary arteries are connected to graft. An accurate three-dimensional numerical method is proposed, based on the immersed boundary technique. The method accounts for the interactions between the flow and the motion of the rigid leaflets and of the deformable aortic root, under physiological pulsatile conditions. The results show that the graft geometry only slightly influences the leaflets dynamics, while using the Valsalva graft the stress level near the coronary-root anastomoses is about half that obtained using the standard straight graft.
2011
Fluid–structure interaction of deformable aortic prostheses with a bileaflet mechanical valve / DE TULLIO, Marco Donato; Afferrante, Luciano; Demelio, Giuseppe Pompeo; Pascazio, Giuseppe; Verzicco, R.. - In: JOURNAL OF BIOMECHANICS. - ISSN 0021-9290. - 44:9(2011), pp. 1684-1690. [10.1016/j.jbiomech.2011.03.036]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/52048
Citazioni
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 23
social impact