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New laser may zap kidney stones faster and safer

NCT ID NCT06667557

Disease control Sponsor: Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 2 times

Summary

This study compares two types of lasers used to break up kidney stones during a minimally invasive procedure called ureteroscopy. One laser uses a superpulse thulium fiber (sTFL), the other is a standard holmium laser. Researchers will enroll 136 adults aged 18–70 with kidney stones 6–20 mm in size. The main goal is to see which laser clears more stones after 3 months, and which causes fewer complications or shorter surgery times.

What this could mean

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

Active substance
Superpulse thulium fiber laser (sTFL) and holmium:YAG laser (Ho:YAG) — both used as surgical devices to break up kidney stones during ureteroscopy.
What this could lead to
If sTFL proves better, it could become the preferred laser for kidney stone surgery, offering higher stone clearance and fewer complications.
What could go wrong
This is a relatively small trial (136 people) comparing two established techniques. Even if sTFL shows advantages, the difference may be modest and not change practice widely.

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 136 people

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

Started

Jan 2025

Expected to finish

Oct 2028

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

Patients aged 18-70 years who plan to undergo fURS lithotripsy for kidney stones and/or upper ureteral stones (6-20mm)

Ages

18 to 70 years

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 old * Diagnosis of kidney stones and/or upper ureteral stones with stone diameter ≥6mm and ≤20mm * Plan to undergo fURS lithotripsy * General anesthesia to complete the operation * The latest urine culture before surgery is negative * Signed and dated informed consent indicating that the patient or his or her legal representative has been fully informed about the study and has consented to participate Exclusion Criteria: * Isolated kidney * Previous history of kidney transplantation or urinary diversion surgery * Congenital malformations of urinary system * Abnormal coagulation mechanism due to blood system diseases, liver diseases, etc. * Severe heart or lung disease, malignancy and immune deficiency status * Neurogenic bladder * Failure to provide informed consent * Have an untreated urinary tract infection * The presence of known anatomic abnormalities (such as ureteral stenosis), urothelial tumors, or stones that can be removed directly without the use of laser lithotripsy * Pregnant women * In cases where the stone cannot be reached with a bendable negative pressure suction sheath, or in cases where the stone cannot be reached with a conventional sheath or the pyeloureteral junction * Surgical completion under epidural anesthesia or lumbar anesthesia * Recurrent stones due to genetic metabolic diseases

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Conditions

The condition(s) this trial relates to.

Kidney Calculi nephrolithiasis ureterolithiasis

As listed by the trial registrant

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

Kidney calculi

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

  • Shanghai General Hospital

    RECRUITING

    Shanghai, Shanghai Municipality, 201620, China

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