Hello SJ,
Here's some information for you:
What If the Suprapubic Catheter Doesn't Work?
http://www.healthcentral.com/incontinence/c/52/7950/catheter-work/
More Information About Suprapubic Catheters
http://www.healthcentral.com/incontinence/c/52/9099/multiple/
As far as how adhesions might interfere, this is an issue that would be best addressed by your doctor.
Best to you,
MG