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.
A permcath is a long, flexible tube that is inserted into a vein most commonly in the neck (internal jugular vein) and less commonly in the groin (femoral vein). This type of ventral venous catheter is tunneled under the skin for a few centimeters usually on the chest before it enter the neck vein.