Abstract
Purpose
Commercial double J stents (DJS) have a uniform shape regardless of the specific nature of various ureteral diseases. We tested renovated DJS and compared them with conventional DJS using ureter models.
Methods
One straight ureter model included stenosis at the distal ureter near the ureterovesical junction and the other did not. We used conventional DJS and renovated 5- and 6-Fr soft DJS for ureter stones and 6-, 7-, and 8.5-Fr hard DJS for tumors. The DJS comprised holes in the upper, middle, or lower one-third of the shaft (length, 24 cm; 2-cm-diameter coils at both ends). More holes were created along the shaft based on the ureteral disease location. Conventional DJS had holes spaced 1 cm apart along the shaft. Renovated DJS had holes spaced 1 cm apart along the shaft with 0.5-cm intervals on the upper, middle, or lower one-third of the shaft. Urine flow was evaluated.
Results
As the DJS diameter increased, the flow rate decreased. The flow rates of DJS with holes in the lower shaft were relatively lower than those of conventional DJS and DJS with holes in the upper and middle shafts. In the ureter model without stenosis, 6-, 7-, and 8.5-Fr renovated stents exhibited significantly higher flow rates than conventional stents. In the ureter model with stenosis, 5-, 6-, 7-, and 8.5-Fr renovated stents did not exhibit significantly higher flow rates than conventional stents.
Conclusion
Renovated stents and conventional stents did not exhibit significant differences in urine flow with stenosis.
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Data supporting this study are included within the article and/or supporting materials.
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Acknowledgements
The authors would like to thank the Sungwon Medical Corp. (Osan, Korea) for their support.
Funding
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2021R1F1A1051004).
The datasets generated and analyzed during the current study are available from the corresponding authors only under a data-sharing agreement request. There are no restrictions on the use of published data after project completion, but we expect users to follow standard scientific citation guidelines and they will need to acknowledge the source of the data in any resulting publication.
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Hyo Jeong Kang, Kyung-Wuk Kim, and Mun Seong Jo contributed to data analysis and data collection or management. Jeong Sik Kim, Sang Jin Jeon, and Changje Lee were involved in data collection or management. Md. Didarul Islam was involved in manuscript writing/editing. Seung Bae Lee and Min Uk Kim analyzed the data. Young Ho Choi and Hyoung-Ho Kim contributed to protocol/project development, data analysis, and manuscript writing/editing.
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Choi, YH., Kang, H.J., Kim, KW. et al. Evaluation of renovated double J stents using ureter models with and without stenosis. World J Urol 42, 228 (2024). https://doi.org/10.1007/s00345-024-04920-7
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DOI: https://doi.org/10.1007/s00345-024-04920-7