Trust Dr. Carlos Marois to Treat Your Urinary Disorders in Verdun

Trust Dr. Carlos Marois to Treat Your Kidney Stones in the Lower Ureter in a Private Hospital

Laser Semi-Rigid Ureteroscopy

This procedure is suggested in the following cases:

  • When a stone in the distal third of the ureter does not spontaneously get expelled because it is larger than 6 mm
  • In cases of severe pain (the stone is not advancing)
  • In case of infection or obstruction of a single kidney


We begin by introducing a “Sensor”-type metallic telescope to get our bearings and for security purposes. The instrument used is a rigid ureteroscope that is introduced via natural passageways till it reaches the stone. Generally, the stone is fragmented by fibre laser or caught using a “retrieval basket” probe (Zero Tip® in nitinol).


The higher the stone, the more difficult its progress. The procedure sometimes requires a flexible ureteroscope or a second intervention, administered after having prepared the ureter by installing a double J stent to help progressive dilation.


Dr. Carlos Marois Urologist

Dr. Carlos Marois Urologist


The intervention takes place under general or spinal anesthetic. It is performed in one day without hospitalisation. The movement is executed by direct vision using a camera and under fluoroscopic monitoring. Today, it is rarely necessary to dilate the ureter to ease the penetration of the instrument. When the stone is removed or fragmented, it becomes necessary to leave a double J stent in place in the ureter to reduce post-operative pain. This is also helps facilitate the elimination of eventual stone debris.


Dr. Carlos Marois Urologist

Resuming work and physical effort is permitted very shortly after the intervention. The double J stent leads to a certain amount of discomfort: bleeding in the urine (variable depending on activities), burning while urinating, frequent urination or back pain while urinating (which can be avoided by urinating frequently and sitting down bending forward). The double J stent is then removed under local anesthetic by cystoscopy.

Before Undergoing Semi-Rigid Ureteroscopy

The surgeries are performed in the only accredited private hospital in Quebec, the Centre Métropolitain de Chirurgie.

Centre Métropolitain de Chirurgie Logo

An evaluation appointment with a copy of the Uroscan imagery is required at one of our two offices.


A blood work, an ECG and a preoperative meeting with a nurse are also necessary. She will be able to answer any additional questions you may have about the surgery.


Lastly, we need to obtain the approval of a CMC anesthesiologist to ensure your health allows general anesthesia.


Call us for more information about our private practice and hospital services.

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