In vivo degradability and biocompatibility of a rheo-formed Mg–Zn–Sr alloy for ureteral implantation

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet


  • Di Tie
  • Renguo Guan
  • Huinan Liu
  • Minfang Chen
  • Sviatlana A. Ulasevich
  • Ekaterina V. Skorb
  • Patricia Holt-Torres
  • Xiaopeng Lu
  • Norbert Hort

The introduction of biodegradable implant materials has significantly improved the postoperative subjective feelings of patients within the past few decades, among which magnesium alloy is widely considered a favorable choice as its appropriate biodegradability and evident antibacterial activity. Here, we reveal a semisolid rheo-formed Mg–Zn–Sr alloy ureteral implant that displayed suitable degradability and biocompatibility in a pig model. Refined non-dendritic microstructure was observed in the rheo-formed alloy, which led to ca. 47% increase in ultimate tensile strength (from 195.0 MPa to 288.1 MPa) and more homogeneous degradation process compared with the untreated alloy. No post-interventional inflammation or pathological changes of the test animals were observed during the implantation period, and the corrosion rate (0.22 ± 0.04 mm·y−1) perfectly fitted the clinical ureteral stent indwelling time. The urine bacteria numbers decreased from 88 ± 13 CFU·mL−1 at 7 weeks post operation to 59 ± 8 CFU·mL−1 at 14 weeks post operation, which confirmed the evident antibacterial activity of the alloy. Our study demonstrates that the Mg–Zn–Sr alloy is clinically safe for urinary system, enabling its efficacious use as ureteral implant materials.

ZeitschriftJournal of Magnesium and Alloys
Seiten (von - bis)1631-1639
Anzahl der Seiten9
PublikationsstatusErschienen - 01.06.2022

Bibliographische Notiz

Funding Information:
Authors acknowledge National Natural Science Foundation of China (grant numbers 51771045 and U1764254) and the Fundamental Research Funds for the Central Universities (grant number N2002016) for the financial supports. Special thanks are due to the instrumental analysis from Analytical and Testing Center, Northeastern University. All the staff in Animal Experimental Center of China Medical University are grateful acknowledged for the animal experiments.

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