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RIRS, or Retrograde Intrarenal Surgery, is a minimally invasive procedure used to treat kidney stones and other urinary tract issues. The procedure involves accessing the kidney through the urinary tract to remove or treat stones or other obstructions. Here's what would typically be required for RIRS:

1. Patient Evaluation: Before the procedure, a thorough evaluation of the patient's medical history and imaging studies (such as CT scans or X-rays) is conducted to assess the size, location, and nature of the kidney stones or urinary tract problem.
2. Anesthesia: RIRS is usually performed under general anesthesia, so the patient will be unconscious during the procedure. Occasionally, local anesthesia and sedation may be used.
3. Cystoscopy: The procedure begins with a cystoscopy, which involves inserting a thin, flexible tube with a camera (cystoscope) into the patient's urethra and through the bladder to access the ureter.
4. Guide Wire Placement: After cystoscopy, a guide wire is inserted through the cystoscope and advanced up the ureter to the kidney, helping to create a pathway for the endoscope.
5. Endoscope Insertion: A ureteroscope, a thin, flexible instrument with a camera on the tip, is inserted through the guide wire into the ureter and then into the kidney.
6. Laser or Pneumatic Lithotripsy: Once the ureteroscope is in place, it can be used to locate and treat the kidney stones. This can be done using a laser to break up the stones (laser lithotripsy) or a pneumatic device to break them into smaller fragments.
7. Stone Removal: The fragmented stones or any other obstructions are removed or flushed out of the kidney through the ureteroscope.
8. Postoperative Stenting: In some cases, a temporary stent may be placed to help with urine flow from the kidney to the bladder. This is often necessary when there is swelling or a risk of obstruction.
9. Monitoring and Recovery: After the procedure, the patient is monitored in a recovery area. The duration of hospital stay or observation can vary depending on the patient's condition and the complexity of the procedure.
10. Postoperative Care: Patients are typically advised to drink plenty of fluids to help flush out any remaining stone fragments. Pain medication and antibiotics may be prescribed as needed.
11. Follow-Up: A follow-up appointment may be scheduled to evaluate the treatment's success and to remove any temporary stents if they were placed.

It's important to note that RIRS is a minimally invasive and effective technique for treating kidney stones and urinary tract issues. However, the specific requirements and details of the procedure may vary depending on the patient's condition and the healthcare facility's practices. Always consult with a urologist or medical professional for personalized guidance and treatment options.