Laser kidney stone removal is a minimally invasive treatment used to break kidney or ureter stones into smaller pieces so they can be removed or passed naturally through the urine. Rather than making a large incision, the urologist usually reaches the stone through the body's natural urinary passage using a thin instrument called a ureteroscope.
Once the stone is reached, a small laser fibre delivers controlled pulses of energy to fragment it. Depending on the stone and the treatment plan, the surgeon may remove the pieces with a small basket or use a technique called dusting, in which the stone is broken into very small particles that can pass through the urine.
Laser treatment is usually performed as part of ureteroscopy. If you are exploring treatment options, the Kidney Stone Surgery process can include several techniques, and the choice depends on the stone's size, location, composition and the patient's individual circumstances.
What exactly is laser kidney stone removal?
Laser kidney stone removal is a form of laser lithotripsy. “Lithotripsy” simply means breaking a stone into smaller pieces. The procedure generally uses a flexible or rigid ureteroscope. A flexible ureteroscope can travel through the ureter and into different parts of the kidney, allowing the surgeon to treat stones located within the kidney as well as stones in the ureter. The laser fibre is extremely small and can be passed through the working channel of the ureteroscope. This allows the surgeon to target the stone directly under visual guidance.
How does the procedure work?
The process can be understood as a series of steps.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Step 1: The urinary tract is accessed
Laser stone treatment is generally performed under anaesthesia. The urologist introduces the ureteroscope through the urethra into the bladder and then into the ureter. There is usually no external surgical incision for this approach because the instrument follows the natural urinary passage.
Step 2: The surgeon locates the stone
Once the ureteroscope reaches the appropriate area, its camera provides a magnified view of the urinary tract. A flexible scope can be manoeuvred into the kidney to reach stones in different calyces. This direct visual access allows the surgeon to identify the stone and position the laser fibre precisely.
Step 3: The laser breaks the stone
A thin laser fibre is placed close to the stone. The laser delivers controlled energy that breaks the stone into smaller pieces. The surgeon can adjust the laser settings depending on the treatment objective and the characteristics of the stone. Some techniques aim to create small fragments that can be removed, while others aim to turn the stone into very fine particles.
Step 4: The fragments are removed or allowed to pass
After the stone has been fragmented, the surgeon may remove larger pieces using a small basket passed through the ureteroscope. Alternatively, the stone can be broken into very fine particles, often described as “dust.” These tiny fragments may then pass naturally through the urine after the procedure.
Step 5: The urinary tract is checked
At the end of the procedure, the surgeon checks the treated area and assesses whether significant residual fragments remain. In selected cases, a temporary ureteral stent may be placed. The stent helps maintain urine drainage while the ureter recovers and any remaining small fragments pass.
What does “dusting” mean?
You may hear the term laser dusting when researching kidney stone surgery. Dusting does not mean the stone disappears instantly. Instead, the laser is used to break the stone into very small particles. These fragments can then be cleared from the urinary tract naturally or with the help of irrigation and suction during the procedure.
The alternative is to create larger fragments and remove them using a basket. In some procedures, surgeons combine fragmentation and basket extraction depending on the size and location of the stone. The goal is to achieve effective stone clearance while limiting unnecessary manipulation and keeping the procedure as safe as possible.
How does the laser reach a kidney stone without cutting the kidney?
This is one of the reasons laser ureteroscopy is considered minimally invasive. The ureteroscope enters through the urethra and bladder before travelling up the ureter. When a flexible scope is used, it can bend and navigate into the kidney's collecting system.
The laser fibre then passes through the scope and is positioned directly next to the stone. The surgeon can therefore treat the stone from inside the urinary tract without making a large incision through the skin.
This approach is different from percutaneous nephrolithotomy (PCNL), in which the surgeon creates a small access tract through the back to reach the kidney. PCNL is generally preferred for larger or complex renal stone burdens.
Which types of kidney stones can be treated with a laser?
Laser lithotripsy can be used for many types of kidney and ureteral stones. The laser does not depend solely on the stone being a particular chemical type; treatment planning is more strongly influenced by factors such as size, location, density, number of stones and the patient's anatomy.
Some stone compositions can be harder or easier to fragment, but modern laser systems can treat a broad range of urinary stones. The stone's composition may become particularly important when planning future prevention, because knowing what caused the stone can help guide dietary or medical measures to reduce recurrence.
Is laser treatment better than shock wave lithotripsy?
Neither treatment is automatically better for every patient. Shock wave lithotripsy (SWL) breaks the stone using shock waves delivered from outside the body. Laser treatment, by contrast, reaches the stone directly with a ureteroscope.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Ureteroscopy generally provides a higher likelihood of becoming stone-free after a single procedure for many ureteral stones, but it is more invasive than SWL and can have a higher complication rate. SWL has the advantage of avoiding passage of an instrument through the urinary tract, but some patients may require more than one session.
What happens if the stone is very large?
Laser ureteroscopy can treat many large stones, but it may not always be the most efficient first choice for a large stone burden. For kidney stones larger than 2 cm, current European guidance recommends percutaneous nephrolithotomy as the first-line treatment in appropriate cases. Flexible ureteroscopy can be considered when PCNL is unsuitable, although additional procedures may be needed. This is why the phrase “laser surgery” should not be interpreted as meaning that every kidney stone, regardless of size, should be treated with a laser.
Will a stent be placed after laser stone removal?
Sometimes, but not always. A ureteral stent is a thin tube placed temporarily inside the urinary tract to help urine flow from the kidney to the bladder. It may be used when the ureter needs support after treatment, when there is swelling, or when residual fragments need to pass.
In uncomplicated ureteroscopy, routine stent placement is not always necessary. The decision depends on the circumstances of the procedure and the condition of the urinary tract. When a stent is placed, some people experience urinary frequency, urgency, discomfort or pain until it is removed.
How long does laser kidney stone removal take?
The duration varies according to the number, size and location of the stones and how difficult they are to reach. A small ureteral stone may be treated relatively quickly, while a larger or more complex collection of kidney stones can require a longer procedure. Very large stone burdens may sometimes need staged procedures rather than attempting to remove everything during one operation. Longer ureteroscopy procedures can carry a higher risk of complications, so surgeons balance stone clearance with procedure time and patient safety.
What is recovery like after laser stone removal?
Because laser ureteroscopy is minimally invasive, recovery is generally shorter than recovery from traditional open stone surgery. It is common to experience some discomfort or burning while urinating for a short period after the procedure. Blood-tinged urine may also occur temporarily. If a ureteral stent has been placed, urinary urgency or discomfort may continue until the stent is removed.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Small residual fragments may pass in the days following treatment. Some patients may be advised to increase fluid intake according to their doctor's instructions and to remain alert for symptoms of infection or significant obstruction. The exact recovery period depends on the extent of treatment, the number of stones treated and whether a stent was placed.
Are there risks with laser kidney stone removal?
Laser ureteroscopy is generally considered an effective minimally invasive treatment, but it is still a medical procedure with potential risks. Possible complications include:
- Urinary tract infection
- Bleeding
- Pain or urinary discomfort
- Ureteral injury
- Residual stone fragments
- Ureteral narrowing or stricture
- Need for another procedure
- Rarely, serious infection or other major complications
What happens after the stone is removed?
Removing the stone treats the immediate problem, but it does not necessarily eliminate the reason the stone formed. If you have had a kidney stone, your doctor may recommend analysing the stone or performing urine and blood tests to identify factors that increase the risk of future stones.
Depending on the findings, prevention may involve changes in fluid intake, diet or medicines. This is particularly important for people who have recurrent stones. Follow-up imaging may also be recommended to check for residual fragments or additional stones that were not treated during the procedure.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
The Bottom Line
Laser kidney stone removal is a minimally invasive procedure in which a urologist reaches the stone through the urinary tract using a ureteroscope and then uses a small laser fibre to break the stone into smaller fragments.
The fragments may be removed with a basket or broken into very fine particles through laser dusting so they can pass naturally. Modern ureteroscopy commonly uses either a holmium:YAG or thulium fiber laser, with the choice of laser and settings tailored to the procedure.
Laser treatment can be highly effective for many kidney and ureteral stones, but it is not automatically the best treatment for every stone. Size, location, density, anatomy and overall health all influence the choice between ureteroscopy, shock wave lithotripsy and PCNL.
A temporary ureteral stent may or may not be required, and recovery is generally relatively short, although urinary discomfort and other temporary symptoms can occur. The long-term goal should also include identifying why the stone formed and taking appropriate steps to reduce the chance of another one developing.
