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Biopolymer-bioglass-antioxidant composite coatings for protection of 316LVM stainless steel sternal wires against inflammation-induced corrosion

Descrizione del progetto

Migliorare la durata dei fili sternali

I fili sternali in acciaio inossidabile sono essenziali per chiudere il torace dopo un intervento chirurgico al cuore. Tuttavia, all’interno del corpo umano devono affrontare sfide significative. La corrosione causata da stress, spazi ristretti e specie reattive dell’ossigeno provoca il rilascio di metalli nocivi o addirittura la rottura dei fili. Con il supporto del programma di azioni Marie Skłodowska-Curie, il progetto BioCoatCorr studierà come questi fili si degradano in condizioni realistiche. I ricercatori svilupperanno un nuovo rivestimento protettivo composto da biopolimero di zeina e cerio per migliorare la durata dei fili e ridurre la corrosione, migliorando così la sicurezza e la qualità della vita dei pazienti.

Obiettivo

316LVM stainless steel sternal wires (SW) are widely used in cardiothoracic surgery for chest closure. However, in the aggressive environment of the human body, SWs are likely to corrode without a protective coating. This can lead to the release of harmful chromium and nickel in the surrounding tissues or, worse, SW rupture with potentially life-threatening complications, such as heart lacerations. SW degradation is caused by several factors, like chloride attack promoted by the creation of confined areas (e.g. at the chest bone/SW interface), plastic deformation due to the placement of SW around the bone, and tensile stress. Moreover, after implantation, the patients immune system unavoidably triggers an acute inflammation episode during which leukocytes generate reactive oxygen species (ROS), such as H2O2 and radicals (notably via the Fenton reactions), that also contribute to the SW deterioration. BioCoatCorr aims to investigate in-depth in vitro degradation of 316LVM SW in phosphate buffer saline involving simultaneously multiple degradation factors (plastic deformation, H2O2, confined areas). For that purpose, electrochemical measurements (corrosion potential monitoring coupled with impedance spectroscopy) will be carried out at various levels of wire deformation. Furthermore, a novel zein-bioglass-cerium protective coating capable of withstanding the harsh SW operative conditions will be prepared using electrophoretic deposition (EPD). The zein biopolymer has been selected for its ductile properties required for matching the significant SW deformation. The cerium will have the functionality of ROS scavenger, limiting the polymer degradation. The anti-corrosion behaviour and mechanical properties of the coatings will be assessed as a function of the synthesis parameters. The results of BioCoatCorr will contribute to developing the next-generation SW with enhanced durability and thus improve patient life quality postoperatively.

Campo scientifico (EuroSciVoc)

Parole chiave

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Meccanismo di finanziamento

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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(si apre in una nuova finestra) HORIZON-MSCA-2024-PF-01

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Coordinatore

INSTITUT DE LA CORROSION SASU
Contributo netto dell'UE
€ 242 260,56
Indirizzo
RUE RIVOALON 220 TECHNOPOLE DE BREST IROISE
29200 Brest
Francia
Regione
Bretagne Bretagne Finistère
Tipo di attività
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Costo totale
Nessun dato