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 peripheral venous catheter. A urinary catheter. A male catheter is placed over the penis. A patient's body type should be considered when selecting an appropriate urinary catheter. When selecting a catheter for a blood transfusion, the primary consideration should be the size of the patient's vein. Recent scientific developments have affected the sizing standards for blood transfusion catheters.