Semi-quantitative elemental imaging of corrosion products from bioabsorbable Mg vascular implants in vivo

Authors

Weilue He, Michigan Technological UniversityFollow
Keith W. MacRenaris, Michigan State University
Adam Griebel, Fort Wayne Metals
Maria P. Kwesiga, Grand Valley State University
Erico Freitas, Michigan Technological UniversityFollow
Amani Gillette, Morgridge Institute for Research
Jeremy Schaffer, Fort Wayne Metals
Thomas V. O'Halloran, Michigan State University
Roger J. Guillory Ii, Marquette University

Document Type

Article

Publication Date

1-2025

Department

Department of Biomedical Engineering; Department of Materials Science and Engineering

Abstract

While metal materials historically have served as permanent implants and were designed to avoid degradation, next generation bioabsorbable metals for medical devices such as vascular stents are under development, which would elute metal ions and corrosion byproducts into tissues. The fate of these eluted products and their local distribution in vascular tissue largely under studied. In this study, we employ a high spatial resolution spectrometric imaging modality, laser ablation inductively coupled plasma time-of-flight mass spectrometry (LA-ICP-TOF-MS) to map the metal distribution, (herein refered to as laser ablation mapping, or LAM) from Mg alloys within the mouse vascular system and approximate their local concentrations. We used a novel rare earth element bearing Mg alloy (WE22) wire implanted within the abdominal aorta of transgenic hypercholesterolemic mice (APOE-/-) to simulate a bioabsorbable vascular prosthesis for up to 30 days. We describe qualitatively and semi-quantitatively implant-derived corrosion product presence throughout the tissue cross sections, and their approximate concentrations within the various vessel structures. Additionally, we report the spatial changes of corrosion products, which we postulate are mediated by phagocytic inflammatory cells such as macrophages (MΦ's).

Publisher's Statement

© 2024 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. Publisher’s version of record: https://doi.org/10.1016/j.bioactmat.2024.07.023

Publication Title

Bioactive materials

Recommended Citation

He, W., MacRenaris, K. W., Griebel, A., Kwesiga, M. P., Freitas, E., Gillette, A., Schaffer, J., O'Halloran, T. V., & Guillory Ii, R. J. (2025). Semi-quantitative elemental imaging of corrosion products from bioabsorbable Mg vascular implants in vivo. Bioactive materials, 43, 225-239. http://doi.org/10.1016/j.bioactmat.2024.07.023
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p2/1329

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.

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Publisher's PDF