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Minimally Invasive Kidney Stone Treatment

RIRS for Kidney Stones

RIRS (Retrograde Intrarenal Surgery) uses a flexible endoscopic approach through the natural urinary passage to reach selected kidney stones. Laser lithotripsy may be used to fragment the stone, with treatment planning based on stone burden, location, anatomy, infection risk, kidney function and the patient’s overall clinical situation.
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Minimally Invasive Endoscopic Approach

Flexible Ureteroscope + Laser Lithotripsy

Personalised Stone Treatment Planning

Follow-Up & Stone-Prevention Guidance

What Is RIRS?

RIRS stands for Retrograde Intrarenal Surgery. A flexible ureteroscope is introduced through the urethra and bladder and then advanced through the ureter into the kidney. Because the kidney is approached through the natural urinary tract, there is no skin incision for the endoscopic access itself. Once the stone is visualised, laser lithotripsy may be used to dust or fragment it. Selected fragments may be retrieved with endoscopic instruments while smaller fragments may be allowed to pass, depending on stone characteristics and the operative plan. The exact technique, devices and need for a ureteric access sheath or temporary stent vary between patients.

When May RIRS Be Considered?

RIRS may be considered when active treatment of a renal stone is appropriate and flexible retrograde access offers a reasonable balance of expected clearance, invasiveness and risk for the individual patient.

Selected renal stones

RIRS is commonly considered for selected small-to-moderate renal stones, with the exact choice depending on stone size, number, density and location.

Lower-pole or difficult locations

Flexible instruments can access different calyces, although unfavourable lower-pole anatomy can reduce the likelihood of successful clearance.

Previous treatment not suitable or unsuccessful

RIRS may be discussed after observation, SWL or another approach is unsuitable or has not achieved the desired result.

Need for retrograde endoscopic treatment

In selected patients, a retrograde approach may be preferable because of anatomy, comorbidity, bleeding-risk considerations or other clinical factors.

Larger stones in selected situations

EAU guidance allows flexible URS for stones >2 cm when PCNL or SWL are not options, but patients should understand that staged procedures and stent placement may be more likely.

Evaluation Before RIRS

A thorough assessment helps determine whether RIRS is appropriate, whether infection is present, whether the kidney is obstructed and whether another stone procedure would offer a better risk-benefit balance.

Consultation & History

Symptoms, previous stone episodes, prior procedures, medicines, medical conditions and available reports are reviewed.

Imaging

Non-contrast CT is frequently used in adults when detailed stone size, location, density and anatomy are required. Ultrasound or other imaging may be appropriate in selected situations.

Urine Testing

Urinalysis and urine culture are considered when infection is suspected or before instrumentation according to clinical protocol.

Blood Tests & Kidney Function

Renal function and other laboratory tests may be checked based on the patient and planned procedure.

Anaesthesia & Medical Fitness

Overall health, allergies, cardiopulmonary status and medicines including antithrombotic therapy are reviewed.

Treatment Choice Discussion

The expected role of RIRS is compared with observation, SWL, PCNL or other approaches where relevant.

How RIRS Fits Into the Treatment Pathway

This section should explain the pathway at a high level for patient education. Do not turn the website into an operating manual.

Access Through the Natural Urinary Tract

The endoscope is introduced through the urethra and bladder and guided into the ureter/kidney.

Flexible Scope Reaches the Kidney

A flexible ureteroscope is used to inspect the collecting system and locate the target stone.

Laser Lithotripsy

Holmium:YAG or thulium-fiber laser technology may be used for flexible ureteroscopic lithotripsy according to equipment and clinical judgement.

Fragment Management

Stone material may be dusted, actively retrieved under direct visualisation or managed using a combination of techniques.

Stent If Clinically Required

A temporary ureteric stent may be placed in selected cases. EAU guidance does not recommend routine stenting after uncomplicated URS, so the website must not imply that every patient needs one.

Flexible Ureteroscopy & Laser Technology

Modern flexible ureteroscopes are designed to navigate within the collecting system and allow visualisation and treatment of stones in different renal calyces. EAU guidance identifies Ho:YAG and thulium-fiber laser (TFL) as effective lithotripsy systems for flexible ureteroscopy. Technology does not replace patient selection. Scope size, deflection, access, irrigation, intrarenal pressure, stone location and duration of the procedure can influence technical feasibility and safety. The live page should focus on what the patient needs to know rather than technical device specifications.

Possible Advantages of RIRS

Potential advantages should be framed as characteristics of the approach, not guaranteed outcomes.

No Percutaneous Skin Tract

The kidney is reached through the natural urinary pathway rather than through a PCNL tract in the back.

Flexible Access to the Renal Collecting System

A flexible scope can reach many intrarenal locations, although anatomy can still limit access.

Option in Selected Higher-Bleeding-Risk Situations

Retrograde flexible URS may be considered when stone removal is essential and antithrombotic therapy cannot be discontinued, with individual specialist planning.

Laser Stone Fragmentation

Laser lithotripsy allows targeted fragmentation/dusting under endoscopic vision.

Often Shorter Inpatient Recovery Than PCNL

Some patients may have a shorter stay than with more invasive procedures, but discharge timing varies by clinical status and local protocol.

Limitations & Risks

Like any intervention, RIRS has limitations and potential complications. The consent discussion must be individualised.

Not Suitable for Every Stone

Large or complex stone burden may be better suited to PCNL, and difficult anatomy can reduce the chance of complete clearance.

More Than One Session May Be Needed

Staged treatment can be required, particularly with larger stone burden.

Infection / Sepsis Risk

Instrumentation of the urinary tract can lead to infection; pre-procedure urine assessment and appropriate antimicrobial strategy are important.

Ureteric Injury

Ureteric trauma, perforation or later narrowing can occur, although serious complications are uncommon.

Bleeding / Pain / Urinary Symptoms

Temporary haematuria, discomfort, frequency or urgency may occur, especially when a stent is present.

Stent-Related Symptoms

Some patients experience frequency, urgency, discomfort or flank pain from a temporary ureteric stent.

Residual Fragments / Recurrence

Not all stone material is necessarily cleared in one session, and future stone formation can occur without preventive management.

RIRS vs PCNL vs SWL vs URSL

ComparisonOptionPatient-Friendly Summary
Approach RIRS Flexible retrograde endoscopic access into kidney through urinary tract.
Approach PCNL Percutaneous tract through the back directly into kidney.
Approach SWL External shock waves fragment selected stones without endoscopic access.
Approach URSL Ureteroscopy primarily for stones in the ureter; flexible instruments may also access kidney.
Typical role RIRS Selected renal stones; option when flexible endoscopic treatment is appropriate.
Typical role PCNL First-line for many large/complex renal stones, especially >2 cm.
Typical role SWL Selected stones depending on size, location, density and favourable anatomy.
Key limitation RIRS May require staged treatment for larger stone burden; difficult lower-pole anatomy can reduce success.
Key limitation PCNL More invasive access with higher bleeding burden than retrograde URS in many comparisons.
Key limitation SWL May need repeat sessions and can be less effective with dense stones/unfavourable anatomy.

Ureteric Stent: What Patients Should Know

A ureteric stent is a temporary internal tube that can help maintain urine drainage. It may be placed before RIRS when retrograde access is initially difficult, or after treatment when the surgeon believes drainage or healing support is needed. EAU guidance states that a post-procedure stent is not required in uncomplicated URS. Therefore the website should say “stent if clinically required” rather than suggesting routine stenting for every RIRS patient. If a stent is used, the patient should receive clear instructions about expected symptoms, medicines where appropriate, planned removal or exchange and when to seek urgent care.

Recovery & After-Care

Hydration

Follow the treating team’s fluid advice; individual recommendations may differ in patients with heart, kidney or other medical conditions.

Medicines

Use prescribed pain relief, antibiotics or other medicines exactly as advised.

Activity

Return to work, travel, exercise and driving depends on anaesthesia, symptoms, stent status and the individual clinical plan.

Stent Guidance

If a stent is present, follow the planned removal/exchange instructions and contact the team if symptoms become severe.

Follow-Up Imaging

Imaging may be recommended to assess residual fragments, obstruction or stone clearance depending on the case.

Stone Analysis & Prevention

Stone analysis and metabolic evaluation may be recommended, especially for recurrent/high-risk stone formers.

Stone Prevention After RIRS

RIRS treats the current stone burden; it does not remove the tendency to form future stones. Prevention should be addressed after the acute episode.

✓ Maintain appropriate fluid intake according to medical advice.
✓ Review diet and sodium intake; avoid generic restrictive diets without understanding stone type and metabolic risk.
✓ Analyse recovered stone material where feasible.
✓ Consider metabolic evaluation in recurrent or high-risk stone disease.
✓ Treat urinary infection and correct relevant urinary drainage problems when clinically indicated.
✓ Use follow-up imaging according to stone burden, procedure result and recurrence risk.

Online / Outstation Consultation

Selected patients can use online consultation for report review, discussion of CT/ultrasound findings, previous procedure records and a second-opinion conversation. Remote review can help determine what information or tests may be required before travel, but it cannot replace physical examination or urgent emergency assessment when these are needed.

Useful records to share

CT KUB / ultrasound reports and images where available; urine culture; kidney-function tests; previous operative notes; current medicines; allergy history.

Book RIRS / Kidney Stone Consultation
Online Consultation / Report Review

Frequently Asked Questions

What is RIRS?
RIRS is flexible retrograde endoscopic surgery used to reach selected kidney stones through the natural urinary tract. Laser lithotripsy may be used to fragment or dust the stone.
The retrograde endoscopic access for RIRS does not require a PCNL-type skin tract. The endoscope passes through the urethra, bladder and ureter.
Suitability depends on stone size, number, location, density, renal anatomy, infection, kidney function and other patient factors. Larger or complex stones may be better treated with PCNL.
Flexible URS can be used in selected patients when PCNL or SWL are not options, but guideline guidance notes that staged treatment and stent placement may be more likely. PCNL remains first-line for many stones above 2 cm.
No. A stent is not routinely required after uncomplicated ureteroscopy, but it may be recommended in selected patients based on access, swelling, drainage, ureteric injury or other clinical factors.
Will the entire stone be removed in one procedure?
Not always. Complete treatment in one session depends on stone burden, location, anatomy and procedure conditions. Some patients require staged treatment.
Risks can include infection, bleeding, ureteric injury, residual stone fragments, stent-related symptoms and the need for additional treatment. Individual risks are discussed during consent.
Recovery varies with anaesthesia, procedure complexity, stent status, symptoms and general health. The website should not promise a fixed recovery period.
Travel timing should be discussed with the treating team, particularly if a stent is present or follow-up is due.
Yes, selected patients can share reports for an online review or second opinion. In-person assessment or additional testing may still be required.
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