24 research outputs found

    Small Vessel Replacement by Human Umbilical Arteries With Polyelectrolyte Film-Treated Arteries In Vivo Behavior

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    ObjectiveThe aim of this study was to evaluate the patency of human umbilical arteries treated with polyelectrolyte multilayers (PEMs) after rabbit implantation.BackgroundThe development of small-caliber vascular substitutes with high patency after implantation remains a real challenge for vascular tissue engineering.MethodsCryopreserved human umbilical arteries were enzymatically de-endothelialized and the luminal surfaces were coated with poly(styrene sulfonate)/poly(allylamine hydrochloride) (PSS/PAH) multilayers. The PEM-untreated arteries and PEM-treated rabbit carotids were used as graft control. The native rabbit carotids were bypassed by grafts.ResultsThe Doppler ultrasound evaluation, performed in vivo, showed that all PEM-treated grafts remained patent during the full experimental period, whereas after only 1 week, no blood circulation was detected in untreated arteries. Scanning electron microscopy and histological graft examination showed pervasive thrombus formation on the luminal surface of untreated arteries after 1 week and clean luminal surface for treated arteries for at least up to 12 weeks. The arterial wall cells were identified through alpha-smooth muscle actin αυδ platelet endothelial cell adhesion molecule-1 expression. The smooth muscle cells positive to alpha-smooth muscle actin were identified in adventitia and media and the endothelial cells positive to platelet endothelial cell adhesion molecule in intima. Von Kossa reaction didn't reveal any calcium salt deposits on the wall arteries, suggesting a good wall remodelling with no sign of graft rejection.ConclusionsThe in vivo evaluation of human umbilical arteries treated with PSS/PAH multilayers demonstrated a high graft patency after 3 months of implantation. Such modified arteries could constitute a useful option for small vascular replacement

    Modifications de surfaces de prothèses vasculaires en polyéthylène de térephtalate : optimisation de l'étanchéité et de l'endothélialisation

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    Trois types de films multicouches ont été construits sur des prothèses en polyéthylène de térephtalate : le Poly(Styrène Sulfonate)/Poly(Allylamine Hydrochloride), le Poly(L-Lysine)/acide hyaluronique, le poly(L-lysine)/poly(L-acide glutamique). Après caractérisation statique, nous avons testé leurs propriétés mécaniques par soumission des films appliqués aux constituants d'une prothèse, à une traction longitudinale puis à des forces de cisaillement (flux pulsé simulant le débit sanguin), avec une bonne tenue. La dynamométrie a démontré l'absence de modification de la force à la rupture d'un filament traité. Les trois systèmes ont permis une amélioration significative de l'étanchéité par rapport à la prothèse contrôle. Le système (PAH/PSS) a été le plus apte à la croissance et l'adhésion cellulaire après culture de cellules HUVEC sur une prothèse traitée.Three films of polyelectrolytes were tested on polyethylene terephthalate: poly(allylamin hydrochlorid)/poly(sodium styrenesulfonate), poly(L-lysine)/hyaluronan polysaccharide and poly(L-lysine)/poly(L-glutamic acid).Static characterizations were carried out, of filaments, threads and prosthesis treated by the three systems. Longitudinal traction have been applied, with constatation of a good resistance. Dynamometric tests demonstrated the absence of modification of the behaviour of a treated filament. Shear stress have been applied with an hydraulic circuit on treated prosthesis, with good resistance of the three systems. Tests of water etancheity were carried out with an improvement between non treated and treated prosthesis. Biocompatibility has been assessed by HUVEC culture upon treated PET and demonstrated better cellular adhesion and proliferation for (PAH/PSS) system.Layer-by-layer films present good mechanical and biological properties for an application in vascular use

    Modifications de surfaces de prothèses vasculaires en polyéthylène de térephtalate : optimisation de l'étanchéité et de l'endothélialisation

    No full text
    Trois types de films multicouches ont été construits sur des prothèses en polyéthylène de térephtalate : le Poly(Styrène Sulfonate)/Poly(Allylamine Hydrochloride), le Poly(L-Lysine)/acide hyaluronique, le poly(L-lysine)/poly(L-acide glutamique). Après carThree films of polyelectrolytes were tested on polyethylene terephthalate: poly(allylamin hydrochlorid)/poly(sodium styrenesulfonate), poly(L-lysine)/hyaluronan polysaccharide and poly(L-lysine)/poly(L-glutamic acid).Static characterizations were carrie

    Chirurgie carotidienne chez les plus de 80 ans, Ă  propos de 132 cas

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    BESANCON-BU MĂ©decine pharmacie (250562102) / SudocSudocFranceF

    Modifications de surfaces de prothèses vasculaires en polyéthylène de térephtalate (Optimisation de l étanchéité et de l endothélialisation)

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    Trois types de films multicouches ont été construits sur des prothèses en polyéthylène de térephtalate : le Poly(Styrène Sulfonate)/Poly(Allylamine Hydrochloride), le Poly(L-Lysine)/acide hyaluronique, le poly(L-lysine)/poly(L-acide glutamique). Après caractérisation statique, nous avons testé leurs propriétés mécaniques par soumission des films appliqués aux constituants d une prothèse, à une traction longitudinale puis à des forces de cisaillement (flux pulsé simulant le débit sanguin), avec une bonne tenue. La dynamométrie a démontré l absence de modification de la force à la rupture d un filament traité. Les trois systèmes ont permis une amélioration significative de l étanchéité par rapport à la prothèse contrôle. Le système (PAH/PSS) a été le plus apte à la croissance et l adhésion cellulaire après culture de cellules HUVEC sur une prothèse traitée.Three films of polyelectrolytes were tested on polyethylene terephthalate: poly(allylamin hydrochlorid)/poly(sodium styrenesulfonate), poly(L-lysine)/hyaluronan polysaccharide and poly(L-lysine)/poly(L-glutamic acid).Static characterizations were carried out, of filaments, threads and prosthesis treated by the three systems. Longitudinal traction have been applied, with constatation of a good resistance. Dynamometric tests demonstrated the absence of modification of the behaviour of a treated filament. Shear stress have been applied with an hydraulic circuit on treated prosthesis, with good resistance of the three systems. Tests of water etancheity were carried out with an improvement between non treated and treated prosthesis. Biocompatibility has been assessed by HUVEC culture upon treated PET and demonstrated better cellular adhesion and proliferation for (PAH/PSS) system.Layer-by-layer films present good mechanical and biological properties for an application in vascular use.STRASBOURG-Sc. et Techniques (674822102) / SudocSudocFranceF

    Don't Miss the Follow Up

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