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#9: Le Cerveau, la machine et l'humain: Le cerveau au XXI ème siècle
Le Cerveau, la machine et l'humain: Le cerveau au XXI ème siècle
Pierre-Marie Lledo

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Presse médicale
Il y a 1 heures
ScienceDirect

Publication date: Available online 22 April 2017
Source:Morphologie
Author(s): J. Mao, Y. Wang, E. Philippe, T. Cianciulli, I. Vesely, D. How, J.-M. Bourget, L. Germain, Z. Zhang, R. Guidoin
IntroductionCross-linking and anti-calcification of prosthetic heart valves have been continuously improved to prevent degeneration and calcification. However, non-calcific structural deteriorations such as cuspal dehiscences along the stent still require further analysis.Material and methodBased upon the previous analysis of an explanted valve after 7 years, a fresh commercial aortic valve was embedded in poly(methyl methacrylate) (PMMA) and cut into slices to ensure the detailed observation of the assembly and material structures. A pericardial patch embossed to provide the adequate shape of the cusps was investigated after paraffin embedding and appropriate staining. The microstructural damages that occurred during manufacturing process were identified and evaluated by light microscopy, polarized microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM).ResultsThe wavy collagen bundles, the key structure of the pericardium patch, were damaged to a great extent at suture sites along the stent and in the compressed areas around the stent post. The fixation of the embossed pericardium patch along the plots of the stent aggravated the microstructural modifications. The damages mainly appeared as the elimination of collagen bundle waviness and delamination between the bundles.ConclusionConsidering [...]

Presse médicale
Il y a 1 heures
ScienceDirect

Publication date: Available online 22 April 2017
Source:Morphologie
Author(s): J. Mao, Y. Wang, E. Philippe, T. Cianciulli, I. Vesely, D. How, J.-M. Bourget, L. Germain, Z. Zhang, R. Guidoin
IntroductionCross-linking and anti-calcification of prosthetic heart valves have been continuously improved to prevent degeneration and calcification. However, non-calcific structural deteriorations such as cuspal dehiscences along the stent still require further analysis.Material and methodBased upon the previous analysis of an explanted valve after 7 years, a fresh commercial aortic valve was embedded in poly(methyl methacrylate) (PMMA) and cut into slices to ensure the detailed observation of the assembly and material structures. A pericardial patch embossed to provide the adequate shape of the cusps was investigated after paraffin embedding and appropriate staining. The microstructural damages that occurred during manufacturing process were identified and evaluated by light microscopy, polarized microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM).ResultsThe wavy collagen bundles, the key structure of the pericardium patch, were damaged to a great extent at suture sites along the stent and in the compressed areas around the stent post. The fixation of the embossed pericardium patch along the plots of the stent aggravated the microstructural modifications. The damages mainly appeared as the elimination of collagen bundle waviness and delamination between the bundles.ConclusionConsidering [...]

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Amazon medecine
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Frédéric Saldmann
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Amazon medecine
Le meilleur médicament, c'est vous !
Frédéric Saldmann
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Amazon medecine
Le meilleur médicament, c'est vous !
Frédéric Saldmann
(363)

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83 neuf & d'occasion à partir de EUR 2,56

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Actualité
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Amazon medecine
Le meilleur médicament, c'est vous !
Frédéric Saldmann
(363)

Acheter neuf : EUR 18,90
83 neuf & d'occasion à partir de EUR 2,56

(Consultez la liste Meilleures ventes Médecine pour des informations officielles sur le classement actuel de ce produit.)