Comparison Between Two Methods for Renal Stone Treatment Mini Percutaneous Nephrolithotomy and Flexible Ureteroscopy With Suction Sheath

NCT07306819 | Recruiting

• 1 other identifier: FMASU MS 725/2025
• Study Type: interventional
• Target: 120
• Locations: 1 country
• Sites: 1

Brief Summary

This study aims to compare the efficacy and safety of two modern, minimally invasive surgical techniques for the removal of kidney stones: Mini-Percutaneous Nephrolithotomy (Mini-PCNL) and Flexible Ureteroscopy (FURS) with Flexible and navigable suction sheath The primary objective is to determine which procedure results in a higher stone-free rate, as measured by post-operative imaging. Secondary objectives include comparing operative time, hospitalization length andcomplication rates between the two treatment groups. Patients with two to three centimeter kidney stones who are candidates for either procedure will be randomly assigned to undergo either Mini-PCNL or suctioning FURS. The outcomes will be critically assessed to help establish a higher level of evidence for guiding surgical management of kidney stones.

Conditions

Stone;Renal; Stone, Urinary; Stone, Kidney; Stone Clearance

Outcome Measures

Primary Outcomes (1)

• stone free rate

  The proportion of participants in each treatment arm who are completely free of any stone fragments in the treated kidney, following the initial procedure and without the need for any secondary surgical interventions. Status will be determined by a blinded central radiologist.

  one month postoperative

Secondary Outcomes (2)

• length of hospital stay

  From date of surgery until date of hospital discharge for 14 days (measured in days).

• operative time

  Measured intraoperatively, from procedure start to end (in minutes).

Study Arms (2)

mini-PCNL

EXPERIMENTAL

Under general anesthesia, a 6 Fr ureteral catheter will be placed into the target ureter via cystoscopy, and bladder drainage will be achieved with a 16 Fr Foley catheter. The patient will then be repositioned to the prone position. Percutaneous renal access will be obtained by puncturing the selected calyx with an 18-gauge coaxial needle under fluoroscopic or ultrasound guidance. Tract dilation will be performed using fascial dilators up to 20 Fr then the mini-PCNL sheath (mini-Amplatz sheath) will be inserted and the mini nephroscope 12 to 15 Fr will be used. If multiple nephrostomy tracts are required for stone removal, the same approach will be repeated for each tract. Stone fragmentation will be carried out with a pneumatic lithotripter. At the end of the procedure, a 6 Fr double-J ureteral stent will be inserted for 4 weeks, and whether to place a nephrostomy tube will be determined at the discretion of the operating surgeon.

Procedure: mini-percutaneous nephrolithotomy

FURS with Tip-Bendable Suction Sheath

EXPERIMENTAL

under general anesthesia with the patient in the lithotomy position. A 6 Fr ureteral catheter will first be placed into the ureter, followed by retrograde pyelography to assess the upper urinary tract. A guidewire will then be advanced into the renal pelvis. either a 12/14 Fr or 11/13 Fr tip-bendable S-UAS will be inserted. If insertion is not possible due to ureteral narrowing, a smaller 10/12 Fr UAS will be attempted. if failed, a double-J stent will be placed and the procedure terminated, with a second session scheduled 4 weeks later. fURS will be performed using digital flexible ureteroscopes either 8.5 Fr or 7.5 Fr according to UAS size; an 8.5-Fr scope for a 12/14 Fr UAS, and a 7.5-Fr scope for an 11/13-Fr or 10/12-Fr UAS. Stone fragmentation will be performed using a holmium laser (Ho: YAG) with a 272-μm fiber and an energy setting below 30 W. Irrigation will be maintained at 50-100 ml/min and suction pressure at 80-120 mmHg. at the end a 6 Fr JJ will be inserted for 4 weeks.

Procedure: Flexible Uerteroscopy with Tip-Bendable Suction Sheath

Interventions

mini-percutaneous nephrolithotomy PROCEDURE

Under general anesthesia, a 6 Fr ureteral catheter will be placed into the target ureter via cystoscopy, and bladder drainage will be achieved with a 16 Fr Foley catheter. The patient will then be repositioned to the prone position. Percutaneous renal access will be obtained by puncturing the selected calyx with an 18-gauge coaxial needle under fluoroscopic or ultrasound guidance. Tract dilation will be performed using fascial dilators up to 20 Fr then the mini-PCNL sheath (mini-Amplatz sheath) will be inserted and the mini nephroscope 12 to 15 Fr will be used. If multiple nephrostomy tracts are required for stone removal, the same approach will be repeated for each tract. Stone fragmentation will be carried out with a pneumatic lithotripter. At the end of the procedure, a 6 Fr double-J ureteral stent will be inserted for 4 weeks, and whether to place a nephrostomy tube will be determined at the discretion of the operating surgeon.

Also known as: Mini-PCNL, mPCNL

mini-PCNL

Flexible Uerteroscopy with Tip-Bendable Suction Sheath PROCEDURE

under general anesthesia with the patient in the lithotomy position. A 6 Fr ureteral catheter will first be placed into the ureter, followed by retrograde pyelography to assess the upper urinary tract. A guidewire will then be advanced into the renal pelvis. either a 12/14 Fr or 11/13 Fr tip-bendable S-UAS will be inserted. If insertion is not possible due to ureteral narrowing, a smaller 10/12 Fr UAS will be attempted. if failed, a double-J stent will be placed and the procedure terminated, with a second session scheduled 4 weeks later. fURS will be performed using digital flexible ureteroscopes either 8.5 Fr or 7.5 Fr according to UAS size; an 8.5-Fr scope for a 12/14 Fr UAS, and a 7.5-Fr scope for an 11/13-Fr or 10/12-Fr UAS. Stone fragmentation will be performed using a holmium laser (Ho: YAG) with a 272-μm fiber and an energy setting below 30 W. Irrigation will be maintained at 50-100 ml/min and suction pressure at 80-120 mmHg. at the end a 6 Fr JJ will be inserted for 4 weeks.

Also known as: FANS, FURS with Suction Sheath

FURS with Tip-Bendable Suction Sheath

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Adult patients aging 18 years old or more.
• Patients with renal stones between 2-3 cm in size confirmed by CT scan.

You may not qualify if:

• Patients with previous ureteric injury.
• Patients with uncontrolled diabetes mellitus or hypertension.
• Patients with uncontrolled hepatic dysfunction.
• Patients with uremia or renal failure.
• Pregnant patients.
• patients with active urinary tract infection.
• Patients with bleeding tendency or uncontrolled coagulopathy.
• Patients with congenital anomalies as horse-shoe kidney and pelvi-ureteric junction obstruction.

Sponsors & Collaborators

• Ain Shams University: lead

Study Sites (1)

Ain shams university hospitals

Cairo, Egypt

RECRUITING

Related Publications (8)

• Zhu W, Liu S, Cao J, Wang H, Liang H, Jiang K, Cui Y, Chai CA, Sahinler EB, Aquino A, Mazzon G, Zhong W, Zhao Z, Zhang L, Ding J, Wang Q, Wang Y, Chen KW, Liu Y, Choong S, Sarica K, Zeng G. Tip bendable suction ureteral access sheath versus traditional sheath in retrograde intrarenal stone surgery: an international multicentre, randomized, parallel group, superiority study. EClinicalMedicine. 2024 Jul 5;74:102724. doi: 10.1016/j.eclinm.2024.102724. eCollection 2024 Aug.

  PMID: 39070176 RESULT

• Tang QL, Liang P, Ding YF, Zhou XZ, Tao RZ. Comparative efficacy between retrograde intrarenal surgery with vacuum-assisted ureteral access sheath and minimally invasive percutaneous nephrolithotomy for 1-2 cm infectious upper ureteral stones: a prospective, randomized controlled study. Front Surg. 2023 Jul 7;10:1200717. doi: 10.3389/fsurg.2023.1200717. eCollection 2023.

  PMID: 37483661 RESULT

• Skolarikos A, Jung H, Neisius A, et al. EAU guidelines on urolithiasis. Arnhem, Netherlands: European Association of Urology; 2024.

  RESULT

• Pauchard F, Ventimiglia E, Corrales M, Traxer O. A Practical Guide for Intra-Renal Temperature and Pressure Management during Rirs: What Is the Evidence Telling Us. J Clin Med. 2022 Jun 15;11(12):3429. doi: 10.3390/jcm11123429.

  PMID: 35743499 RESULT

• Guven S, Yigit P, Tuncel A, Karabulut I, Sahin S, Kilic O, Balasar M, Seckiner I, Canda E, Sonmez MG, Tefik T, Boz MY, Atis G, Ergin G, Soytas M, Senel C, Kirac M, Kiremit MC, Akand M, Tugcu V, Erkurt B, Muslumanoglu A, Sarica K. Retrograde intrarenal surgery of renal stones: a critical multi-aspect evaluation of the outcomes by the Turkish Academy of Urology Prospective Study Group (ACUP Study). World J Urol. 2021 Feb;39(2):549-554. doi: 10.1007/s00345-020-03210-2. Epub 2020 Apr 28.

  PMID: 32347334 RESULT

• Geraghty R, Abourmarzouk O, Rai B, Biyani CS, Rukin NJ, Somani BK. Evidence for Ureterorenoscopy and Laser Fragmentation (URSL) for Large Renal Stones in the Modern Era. Curr Urol Rep. 2015 Aug;16(8):54. doi: 10.1007/s11934-015-0529-3.

  PMID: 26077357 RESULT

• Gauhar V, Traxer O, Castellani D, Sietz C, Chew BH, Fong KY, Hamri SB, Gokce MI, Gadzhiev N, Galosi AB, Yuen SKK, El Hajj A, Ko R, Zawadzki M, Sridharan V, Lakmichi MA, Corrales M, Malkhasyan V, Ragoori D, Soebhali B, Tan K, Chai CA, Tursunkulov AN, Tanidir Y, Persaud S, Elshazly M, Kamal W, Tefik T, Shrestha A, Tiong HC, Somani BK. Could Use of a Flexible and Navigable Suction Ureteral Access Sheath Be a Potential Game-changer in Retrograde Intrarenal Surgery? Outcomes at 30 Days from a Large, Prospective, Multicenter, Real-world Study by the European Association of Urology Urolithiasis Section. Eur Urol Focus. 2024 Dec;10(6):975-982. doi: 10.1016/j.euf.2024.05.010. Epub 2024 May 24.

  PMID: 38789313 RESULT

• Alenezi H, Denstedt JD. Flexible ureteroscopy: Technological advancements, current indications and outcomes in the treatment of urolithiasis. Asian J Urol. 2015 Jul;2(3):133-141. doi: 10.1016/j.ajur.2015.06.002. Epub 2015 Jun 23.

  PMID: 29264133 RESULT

MeSH Terms

Conditions

Nephrolithiasis; Urinary Calculi; Kidney Calculi

Condition Hierarchy (Ancestors)

Kidney Diseases; Urologic Diseases; Female Urogenital Diseases; Female Urogenital Diseases and Pregnancy Complications; Urogenital Diseases; Urolithiasis; Male Urogenital Diseases; Calculi; Pathological Conditions, Anatomical; Pathological Conditions, Signs and Symptoms

Study Officials

• Ahmed M Tawfeek, assistant proffessor

  Ain Shams University, Department Of Urology

  STUDY CHAIR

• Ahmed Higazy, lecturer of urology

  Ain Shams University, Department Of Urology

  STUDY DIRECTOR

• Ashraf Satour, lecturer of urology

  Ain Shams University, Department Of Urology

  STUDY DIRECTOR

Central Study Contacts

Mohamed M Hasab Allah, resident

CONTACT

+201012663766; Mohamed-Hasaballah@med.asu.edu.eg

Ahmed Higazy, Lecturer of Urology

CONTACT

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: resident of urology

Study Record Dates

• First Submitted: November 28, 2025
• First Posted: December 29, 2025
• Study Start: October 15, 2025
• Primary Completion (Estimated): August 15, 2026
• Study Completion (Estimated): September 15, 2026
• Last Updated: December 29, 2025

Record last verified: 2025-11

Data Sharing

• IPD Sharing: Will not share

Locations

EG (1)