Many people use the terms ocean and sea interchangeably when speaking about the ocean, but there is a difference between the two terms when speaking of geography (the study of the Earth's surface).
The peritoneal dialysis catheter is composed of a flexible silicone tube with an open-end port and several side holes to provide optimal drainage and absorption of the dialysate. The extraperitoneal component of the catheter has either one or two Dacron cuffs. The Dacron cuffs are for optimal ingrowth and fixation.
Sometimes, a doctor will insert the catheter into the bladder through a tiny hole in the abdomen. This type of indwelling catheter is known as a suprapubic catheter. A tiny balloon at the end of the catheter is inflated to prevent the tube from sliding out of the body.