Do you mean supra-pubic catheters. lf so - As someone who has had a SPC for 19yrs. lt has been my experience - that if you do not give the catheter a couple of turns - do it most days - lt will adhere to the walls of the bladder and become blocked. This also makes the bladder wall sore leaving it open uti’s. l have mine changed every 5 weeks - any longer it becomes difficult to remove as it get crystallised - gummed up! Also, l have a short female length cath - attached to a drainage bag with a direct contact valve - so no length of tubing that can get kinked and cause blocking. l just tie the bag with a lace around my waist - it sits nice and neat and comfortable inside my ‘short style nix’. Tap end near my hip - so easy to just undo top button of jeans to allow me to empty. lt is virtually undetectable.
Also, l do take D-Mannose capsules - they help keep bladder healthy. Tea/Coffee/Coke will irritate the bladder.
l heard of a new catheter - in US - that has two balloons. One on the very tip that prevents the problem of irritating and blocking the bladder. lt is called Duette - So far not available in UK as they only have FDA approval - still waiting for CE stamp to export.
You can look up this Duette cath on youtube - and see the damage an ordinary foley type cath can do.
Because the SPC is on permanent drain - it means the bladder is like an old deflated balloon - and the sides fall in and can get stuck onto the cath as the drainage eyes/holes are sucking the urine through.
My district nurses are intrigued by the way l wear mine - as it is the opposite to what they have been taught. But it works well with very little problem. ln fact the last time they came - l questioned whether the nurse had inflated the balloon. She was a bit shirty that l had doubted her - and said of course she had. An hour later it came out - yes, she had not inflated it. So l quickly pushed it back in and filled the balloon with the liquid myself.