Use disposable flexible Ureteroscope(URS) with the Clearpetra® Ureteral Access Sheath
Make sure the shaft of the flexible URS is at the least 2 Fr smaller than the sheath
Set the continuous negative aspiration at the least 200 mmhg
Use the continuous pressurized irrigation at the least 60CC/minute
Withdraw the URS to the red band on the sheath to open anunimpeded channel for the passage of larger stonefragments
Advance the Sheath onto the stone and fire the laser inside the sheath whenever possible
