The JJ catheter is a flexible, thin tube (about 3 mm in diameter), the ends of which each form a loop (hence the double J term) which allows the catheter to stay in place between the kidney and the bladder. JJ catheters are inserted into the ureter, which is the channel through which urine flows from the kidney to the bladder. A JJ catheter is placed to prevent or bypass an obstacle in the ureter. Treatment of kidney stones or ureteral stones is the most common indication for placing this catheter. When the stone has been fragmented, by intra- or extracorporeal lithotripsy, it is common for small debris to migrate into the canal and totally or partially block the flow of urine which can cause severe pain (renal colic) or severe pain. urinary tract infection.
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