A vascular access system and clearing method. A vascular access system is provided comprising an implantable access port for receiving medication transdermally, a catheter connected to an outlet in said port for infusing that medication into the blood stream, a wire for clearing the catheter of an obstruction,...http://www.google.com.au/patents/US5281205?utm_source=gb-gplus-sharePatent US5281205 - Vascular access system and clearing method
