The main purpose of this study is to determine if the Angiotech central venous catheter (CVC) is equal in effectiveness to a CVC coated with chlorhexidine and silver sulfadiazine in preventing bacterial catheter colonization. Other objectives of this study are to determine if the Angiotech CVC is equal in effectiveness to a CVC coated with chlorhexidine and silver sulfadiazine in preventing catheter-related local infection, and catheter-related bloodstream infection. This study will also assess the safety of the Angiotech CVC.