Think of the bladder as a very large and powerful muscle!
When the prostate is removed the surgeon has to put the bladder back together with the urethra. A catheter is placed to “stent” this area of the anastomosis. The reason a catheter is used and left in from 6-14 days is to allow time for this area to heal. In doing so keeping urine from leaking out into the area where the prostate was removed.
So…you have the bladder sewed to the urethra and going through this is a catheter. The catheter, a foley catheter, has a balloon on it that keeps it from falling out. The balloon is just inside the bladder on the proximal side of the anastomosis.
There is a space around the catheter that allows both blood and urine to leak around the catheter, through the anastomosis, and then out the tip of the penis, not through the catheter, but around it.
In the case of…
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