Prospective, Randomized Trial Comparing Soft and Firm Ureteral Stents

The goal of this clinical trial is to evaluate whether ureteral stent type impacts stent-related symptoms and quality of life in patients undergoing ureteroscopy (URS) and stone lithotripsy for ureteral stones. The main questions it aims to answer are: * Does a soft polymer stent reduce stent-related symptoms compared to a firm polymer stent? * Does stent type affect intra- and postoperative complications? Researchers will compare patients receiving a soft polymer stent (Universa®, Cook Medical) to those receiving a firm polymer stent (Percuflex®, Boston Scientific) to determine if soft stents improve patient comfort and quality of life while maintaining a similar safety profile. Participants will: * Undergo URS and stone lithotripsy for ureteral stones. * Be randomly assigned to receive either a soft or firm ureteral stent. * Complete the Ureteral Stent Symptoms Questionnaire (USSQ) upon stent removal, 14 days after URS.