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    Influence of the manufacturing process on the corrosion and mechanical behavior of esophageal stents

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    Authors
    Alferi, D.
    Fojt, J.
    Kristianova, E.
    Edwards, D. W.
    Laasch, Hans-Ulrich
    Affiliation
    Faculty of Medicine in Hradec Kralove, Charles University, 500 03 Hradec Kralove, Czech Republic
    Issue Date
    2023
    
    Metadata
    Show full item record
    Abstract
    Esophageal nitinol stents are an established method for treating swallowing difficulties caused by obstructing cancer. This raesearch investigates the influence of different qualities of raw metal alloys in combination with production technology on corrosion resistance in standardized simulated gastric fluid (SGF). Four different international stent manufacturers produced samples of their standard stents from nitinol sourced from three different alloy manufacturers. The stents were subjected to a 6-week immersion in SGF. During the immersion, the surface was studied at specified intervals using microscopy. The surface of the samples was also studied by X-ray Photoelectron Spectroscopy and after immersion the released ions were analyzed. Results demonstrated that both raw material and certain steps in the manufacturing process negatively affect corrosion resistance. Analysis of the SGF showed that the amount of nickel released is proportional to the degree of corrosion attack. Finally, current accepted standard test methods are inadequate for assessing susceptibility to corrosion by gastric acid and should take the low pH of the implanted environment into account. Conversely, certain measures in the manufacturing process are able to reduce the impact of the base material on corrosion susceptibility.
    Citation
    Alferi D, Fojt J, Kristianova E, Edwards DW, Laasch HU. Influence of the Manufacturing Process on the Corrosion and Mechanical Behavior of Esophageal Stents. Metals. 2023 Sep;13(9). PubMed PMID: WOS:001075948600001.
    Journal
    Metals
    URI
    http://hdl.handle.net/10541/626671
    DOI
    10.3390/met13091542
    Additional Links
    https://dx.doi.org/10.3390/met13091542
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.3390/met13091542
    Scopus Count
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