Abstract
Background
Ureteral obstruction is a urinary system disease that causes urinary retention, renal injury, renal colic, and infection. Ureteral stents are often used for conservative treatment in clinics, and their migration usually results in ureteral stent failure. The migrations include proximal migration to the kidney side and distal migration to the bladder side, but the biomechanism of stent migration is still unknown.
Method
Finite element models of stents with lengths from 6–30 cm were developed. The stents were implanted into the middle of the ureter to analyze the effect of stent length on its migration, and the effect of stent implantation position on 6-cm-long stent migration was also observed. The stents’ maximum axial displacement was used to assess the ease of stent migration. A time-varying pressure was applied to the ureter outer wall to simulate peristalsis. The stent and ureter adopted friction contact conditions. The two ends of the ureter were fixed. The radial displacement of the ureter was used to evaluate the effect of the stent on peristalsis.
Results and discussion
The maximum migration occurs in the positive direction for a 6-cm-long stent implanted at the proximal ureter (CD and DE), but in the negative direction at the distal ureter (FG and GH). The 6-cm-long stent demonstrated almost no effect on ureteral peristalsis. The 12-cm-long stent diminished the radial displacement of the ureter from 3–5 s. The 18-cm stent diminished the radial displacement of the ureter from 0–8 s, and the radial displacement within 2–6 s was weaker than other time. The 24-cm stent diminished the radial displacement of the ureter from 0–8 s, and the radial displacement within 1–7 s was weaker than other time.
Conclusion
The biomechanism of stent migration and ureteral peristalsis weakening after stent implantation was explored. Shorter stents were more likely to migrate. The implantation position had less influence on ureteral peristalsis compared with the stent length, which provided a reference for stent design aimed at reducing stent migration. Stent length was the main factor affecting ureteral peristalsis. This study provides a reference for the study of ureteral peristalsis.
Graphical Abstract
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (12172034, U20A20390, 11827803), Beijing Municipal Natural Science Foundation (7212205), the 111 project (B13003) and the Fundamental Research Funds for the Central Universities.
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Zhu, L., Wang, L., Gao, Y. et al. Effect of ureteral stent length and implantation position on migration after implantation. Med Biol Eng Comput 61, 2067–2076 (2023). https://doi.org/10.1007/s11517-023-02856-5
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DOI: https://doi.org/10.1007/s11517-023-02856-5