This was due to "continuous tourniquet effect".
There are many choices of condom catheters. I use the ones with adhesive (comes off easily when I take it off but stays on just fine when in use) and there is no band causing any tourniquet effect.
I believe in this case the condom catheter was on continuously for long periods of time.
The article also proper care and routine maintenance. I believe that would mean throwing it away after use and washing and probably not wrapping the band so tight that it causes a tourniquet effect in the first place. I guess a good rule of thumb would be "if it turns blue, it is too tight!".
I'm still a happy user of the condom catheters at night. Best sleep I've had in years since I started using them.
