the catheter is a tube with a bulb on the end. It is inserted in the penis and the bulb end goes up inside the bladder. Once in place, the bulb is inflated with sterile water by filling the bulb, using a syringe. This line to the bulb is very small and seperate from the catheter itself. Once the bulb is inflated, it swells up and seals the bottom or neck of the bladder, keeping the catheter tube inside and preventing urine leakage outside. The bulb and end is inside the bladder maybe 3/4 to 1 inch and the bulb does an excellent job of keeping the catheter inside. Pulling, tugging and such will not dislodge an inflated catheter bulb. The danger of injury from the bulb is the act of pulling on the catheter and bulb to the extent that it breaks the stitches that are holding the bladder neck together for healing. I couldn't feel my catheter, except at the head of the penis. The line there did irritate and the penis would actually slide up and down on the tubing, which is why the tube there is kept lubricated with an antibiotic salve such as neosporin and such. There is no danger of anything being sucked up inside, the device is gravity driven and has no internal suction capability. Mobility can be a pain until you figure how to move with it. The act itself isn't a problem, hundreds of thousands of people live their daily life with them, it's just the newness to us the first time. Most of us will use the big bag especially the firsdt few days and while at home. This bag is carried around and causes little problems itself. The tubing and positioning is the problem with it, it seems. The smaller leg bag is attached to the leg, either the thigh or the calf, and allows for hidden use when outside and moving around. This bag holds 1/4 the urine the big bag does, but allows for much more mobility. Removal of the catheter is usually a non-event. The nurse or doctor will remove the sterile water in the bulb with a syringe and the catheter will usually just slide out on its own, with a 'funny' feeling", as described here many times. The whole thing slides out and is discarded, you pull up your pants, with a pad or diaper the first time, just to be safe and you are on your way. Here's a link to a diagram of the Foley Catheter system.
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