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Which kidney stone surgery is safer for your ureter? a large study investigates

NCT ID NCT07767773

Knowledge-focused Sponsor: Al-Azhar University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Aug 17, 2026 · Last updated Aug 19, 2026 · Updated 2 times

Summary

This study looks back at adults who had surgery for kidney stones up to 20 mm, comparing those who had a ureteral access sheath placed during the procedure with those who did not. The goal is to see whether using the sheath affects the risk of developing a narrowed ureter or hydronephrosis (kidney swelling) at least a year later. By reviewing medical records and inviting patients for follow-up, researchers hope to identify which approach is safer for long-term kidney and urinary tract health.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Ureteral access sheath-assisted retrograde intrarenal surgery (RIRS) versus sheathless RIRS
What this could lead to
If the sheath is found to be safer, it could guide surgeons to choose the approach that reduces the risk of long-term ureteral damage after kidney stone surgery.
What could go wrong
This is a retrospective study, so it can only show associations, not proof. Results may be affected by differences between patient groups, and the follow-up is at least 12 months, which may not capture all long-term complications.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 1,200 people

The number the study aims to enrol. It can still change while the study runs.

Started

Aug 2026

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Adult patients (≥18 years) who underwent primary RIRS for renal stones ≤20 mm without ipsilateral preoperative ureteral stenting or nephrostomy at Al-Azhar University Hospitals between Jan 1, 2020 and Dec 31, 2025; active follow-up performed ≥12 months after index procedure.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age ≥18 years at time of index RIRS. * Primary RIRS performed at Al-Azhar University Hospitals between Jan 1, 2020 and Dec 31, 2025. * Renal stone(s) with maximum diameter ≤20 mm on preoperative imaging. * No ipsilateral ureteral stent or nephrostomy before index RIRS. * Documented operative record specifying whether a UAS was used. * At least 12 months elapsed since index RIRS. * Available contact information allowing invitation for active follow-up. Exclusion Criteria: * Primary ureteral stone treated during the same procedure. * Staghorn or \>20 mm stone burden. * Prior ipsilateral ureteral stricture or reconstructive surgery. * Congenital renal/ureteral anomalies affecting outcome (e.g., horseshoe kidney, duplicated system). * Incomplete operative or preoperative imaging records that preclude determination of eligibility or exposure (UAS use). * Additional ipsilateral ureteral procedure during follow-up that independently causes ureteral narrowing. * Refusal to participate in active follow-up or failure to attend after repeated attempts.

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Conditions

The condition(s) this trial relates to.

hydronephrosis nephrolithiasis stricture or kinking of ureter urolithiasis

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Hydronephrosis Renal stone disease Retrograde intrarenal surgery Ureteral access sheath Ureteral stricture Urolithiasis

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Department of Urology, Al-Hussein and Sayed Galal University Hospitals, Al-Azhar University

    RECRUITING

    Cairo, Egypt

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