This includes peripheral venous catheters and central venous catheters. These "cath labs" are often equipped with cabinets of catheters, stents, balloons, etc. This occurs most commonly on intravenous catheters and on medical prostheses. There are no absolute contraindications to the use of central venous catheters. Urinary catheters or surgery are generally not recommended. Commonly used tunneled catheters include Hickman catheters and Groshong catheters. Patients with compromised immunity or those with central vascular catheters are at especial risk. Applicators are non-radioactive and are typically needles or plastic catheters. Commonly used non-tunneled catheters include Quinton catheters. The use of intrauterine catheters are also indicated. Silver is incorporated into medical implants and devices such as catheters. There are many different types of catheters for bladder problems. Acinetobacter can enter through open wounds, catheters and breathing tubes. The most advanced catheters have a thin hydrophilic surface coating. Skin microbes are a potential source of infected medical devices such as catheters.