GraWood, I have had a urethral catheter on around 13 separate occasions , probably amounting to around a couple of hundred nights. In that time I have probably had a couple of disconnections and they were the catheter to leg bag connection and were probably after a new leg bag had been fitted, make sure that connection is tight, nurses never seem too push them together properly. If they do come apart make sure the surfaces are dry before reconnecting or they may just come apart again. Technically a bag should never be refitted, but in the middle of the night I know what I would do.
At night make sure the inside of the leg bag connection is dry before connecting the night bag, make sure the connection is tight. I use a g strap or thigh strap to secure the night bag tube to my ankle, get a spare one from the hospital, I can toss and turn all night and there is no strain on the joint. The night bag is designed to fit on a stand, I have my night bag on a stand inside a bucket. I have read a medical article that suggested blockages in the catheter were frequently caused by unsupported night bags.
If it is not too warm a pair of pyjama bottoms will also help stop and tangles.
There are some gels that contain anesthetic, antiseptic and lubricant that are designed for catheter insertion and maintenance. The gels are available from a pharmacy without prescription (except Boots), for around £3. Instilagel, hydrocaine or optilube are the three I have used ,they are particularly good if the eye of the penis gets sore. The hospital may supply you with some. Make sure the catheter is fixed to you leg, the less it can move the less likely it is to rub in the eye of the penis.
Your catheter should be your new best friend for those first days after surgery,no need to get out of bed in the middle of the night. Make sure you remember to open the leg bag tap before going to sleep and make sure you close the leg bag tap before disconnecting the night bag.
It is sometimes easy to accidentally catch the leg bag tap , you only find out when your socks get wet. I use a lock, but a cut down velcro leg strap can achieve the same result.
The extra thigh strap is also useful when showering. Disconnect the night bag if applicable. Make sure the catheter is secured to the leg strap, drain the leg bag and remove the bag straps. Either let the bag hang from the catheter or tuck the leg bag tap under the thigh strap. Shower as normal, some leg bags have a fabric backing just dab it dry after showering. Dry off after your shower, take the spare G,-strap and put it on the opposite leg , transfer the catheter to the dry strap and refit the leg bag straps, remove the wet strap and let it dry for next time.
The catheter is quite robust and the balloon inside will prevent it from pulling out. Almost Inevitably at some point you will catch the catheter,that will get your attention.
I was told rosé coloured urine in the bag should be okay ,red coloured urine needs attention.
Hope all goes well.