Mini PCNL is a minimally invasive surgical procedure designed to remove kidney stones through a small incision in the back. The “mini” designation refers to the use of smaller instruments and access sheaths compared to standard PCNL, typically instruments between 14 and 20 French in diameter (approximately 4.7-6.7mm). During this procedure, a urologist creates a direct channel from the skin into the kidney, allowing for stone fragmentation and removal under direct visualisation.
This technique may be suitable for kidney stones ranging from 1 to 3 centimetres in size, though it can also address larger or multiple stones, depending on their location and composition. The procedure utilises specialised endoscopic equipment, including a nephroscope (a thin telescope-like instrument) and various stone-fragmentation devices, such as lasers or ultrasonic lithotripters. Mini PCNL bridges the gap between less invasive procedures such as shock wave lithotripsy (ESWL) or ureteroscopy and traditional PCNL, aiming to reduce tissue trauma while maintaining stone clearance rates.
The procedure addresses various types of kidney stones, including calcium oxalate, calcium phosphate, struvite, and uric acid stones. Stone clearance rates with Mini PCNL can vary depending on stone size, location, and composition.