Charli, I found some information for you on the preternal catheter at
www.homedialysis.org. This is a great site for information.
Here is an excerpt:
Presternal catheter
A presternal catheter is placed in the chest wall, and the tip reaches down into the abdomen. The chest is thinner and less germy than the abdomen, so infection is less likely. Chest skin also moves less than belly skin, so a presternal catheter is a good choice for a child or for someone who is heavy. You can take tub baths with a presternal catheter, if you keep it out of the bath water. Swimming is not suggested.
Before you get a presternal catheter, you'll be asked if you prefer it to exit on the right or left side. If you are a woman, be sure to avoid your bra area so the catheter will not rub. You will be given antibiotics through an intravenous within 24 hours before the catheter is placed. Using anesthesia, small (3-4 cm) cuts are made at the second and third rib and on the abdomen. Two parts of the catheter are inserted and held in place with a titanium connector. Pockets are made under the skin for the cuffs.