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People who self cath can develop what is known as a false passage from the catheter going the wrong place int he urethra on occasion. The catheter can get "hung up" in this sort of divot in the urethra. You may also have a stricture (scar tissue) preventing passage of the catheter.You will need to see your urologist to see if they can get the catheter in and if they can't, they will need to look in the urethra with a cystoscope and possibly dilate the urethra. Hope this helps and let me know if there is anything else I can answer.