On October 13, 2025, the Urology Team of the Affiliated Ruikang Hospital of Guangxi University of Chinese Medicine successfully completed the first national implantation of a domestic ureteral stent system. The procedure was uneventful, and post - operative imaging studies confirmed the restoration of patency in the patient's ureteral lumen. The EVT Medical Ureteral Stent System is indicated for the treatment of ureteral obstruction resulting from benign strictures or malignant tumor compression, offering a novel endoluminal therapeutic alternative.

The patient was an elderly female diagnosed with left mid - ureteral stricture and secondary severe left hydronephrosis. She had a 12 - year history of routine ureteral stent placement, with scheduled replacements every 6 to 12 months, and had previously undergone left ureteral covered stent implantation.

Surgical Technique

1. 1.The patient was placed under general anesthesia and positioned in the lithotomy position. A ureteroscope was introduced, followed by the placement of a safety guidewire, whose position was verified under fluoroscopic guidance.
2. 2.Retrograde pyelography was performed to delineate the location and length of the ureteral stricture.
3. The strictured segment was dilated using a ureteral balloon catheter. Subsequently, the Eweidi Ureteral Stent System was advanced along the guidewire until the proximal end of the stent extended beyond the proximal margin of the stricture by more than 1.5 cm.
4. 3.The outer sheath was slowly retracted to deploy the stent, and complete stent deployment was confirmed under fluoroscopy. The pull - wire handle was loosened, and the pull - wire was removed.
5. 4.Following a 3 - minute period to allow for full stent expansion, the delivery system was withdrawn. A repeat ureteroscopy and retrograde angiography were conducted to confirm the proper positioning of the stent.
6. Finally, the guidewire and other instruments were removed, marking the completion of the procedure.

Stent System Advantages

• Self - expanding Nitinol Scaffold: The nitinol support structure exhibits self - expanding properties, ensuring effective scaffolding of the strictured segment and optimal drainage efficacy (1, 3, 4).
• Graded Terminal Radial Force: The progressive reduction in radial force at the stent distal end minimizes irritating effects on surrounding tissues (2, 4).
• Anchoring Mesh & Anti - Ingrowth Coating: The specialized mesh design facilitates secure apposition to the ureteral wall, preventing stent migration. The surface coating inhibits stent encrustation and tissue ingrowth (1, 2).
• Patent Lumen & Hydrophobic Surface: The large - bore lumen resists obstruction, while the hydrophobic surface property reduces the incidence of encrustation and associated infections (1, 4).

• References

  [1] Zhang, C. L., Wang, M. R., Wang, Q., Xu, K. X., Xu, T., & Hu, H. (2022). Long - term efficacy evaluation of covered metal ureteral stents in the maintenance treatment of refractory ureteral strictures after ureteroscopic lithotripsy. Journal of Peking University (Health Sciences), 54(4), 674 - 679.
  [2] Dong, W. M., Wang, M. R., Hu, H., Wang, Q., Xu, K. X., & Xu, T. (2020). Initial clinical experience and follow - up results of long - term indwelling Allium covered metal ureteral stents for the treatment of uretero - ileal anastomotic strictures. Journal of Peking University (Health Sciences), 52(4), 637 - 641.
  [3] Song, J. N., Zhang, X. X., Du, C. W., et al. (2025). Application of Allium metal covered stents in the treatment of medium - to long - segment ureteral strictures. Chinese Journal of Endourology (Electronic Edition), 19(02), 192 - 196. https://doi.org/10.3877/cma.j.issn.1674 - 3253.2025.02.011
  [4] Ming, Y. J., Shu, T. H., & Xiang, Z. G. (2023). Clinical application of Allium covered stents in urology. Advances in Clinical Medicine, 13(12), 20336 - 20341.