Hi Boolya,
Don't know if this will help as I obviously don't know your DH's situation.
I have an atonic bladder and I have to self-catheterise several times every day.
I don't have a long-term catheter in situ, whereas your DH might? It sounds like the gel he has to use is possibly in a tube separate from the catheter?
If he would be able to self-catheterise I can give you the details of the catheters I use which you should be able to obtain through your GP. Each catheter comes in an individual plastic container about the size of a ballpoint pen. I simply have to unscrew the top and draw out the catheter tube which is already coated in the gel (no spillage!) I insert the catheter, draw off the urine, withdraw the catheter and throw it away.
Obviously if your DH has a long-term catheter that stays in situ for several weeks this wouldn't apply but whatever your situation you have my sympathy as it really is a drag to constantly have to do what your bladder should do naturally.
I hopes this helps and my best wishes to you both 