Peritoneal Dialysis

In medicine, peritoneal dialysis is a method for removing waste such as urea and potassium from the blood, as well as excess fluid, when the kidneys are incapable of this (i.e. in renal failure). It is a form of renal dialysis, and is thus a renal replacement therapy. Peritoneal dialysis works on the principle that the peritoneal membrane that surrounds the intestine, can act as a natural semipermeable membrane (see dialysis), and that if a specially formulated dialysis fluid is instilled around the membrane then dialysis can occur, by diffusion. Excess fluid can also be removed by osmosis, by altering the concentration of glucose in the fluid.
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Peritoneal dialysis n. The removal of soluble substances and water from the body by transfer across the peritoneum, utilizing a solution which is [more]Peritoneal dialysis - Community and Resources

Technique that uses the patient’s own body tissues inside of the belly (abdominal cavity) to act as a filter. The intestines lie in the abdominal cavity, the space between the abdominal wall and the spine. A plastic tube called a "dialysis catheter" is placed through the abdominal wall into the abdominal cavity. A special fluid is then flushed into the abdominal cavity and washes around the intestines. The intestinal walls act as a filter between this fluid and the blood stream. By using different types of solutions, waste products and excess water can be removed from the body through this process.

see dialysis.
  

PD uses a cleaning solution, called dialysate, that flows through a special tube into your abdomen. After a few hours, the dialysate gets drained from your abdomen, taking the wastes from your blood with it. Then you fill your abdomen with fresh dialysate and the cleaning process begins again. This treatment can be done at home, at your workplace, or at another convenient location (See dialysis and hemodialysis.).