A catheter assembly includes a tubular member having a first connector at its distal end for coupling with the proximal end of a catheter. The tubular member has at least one external guide wire that is slidably contained inside the tubular member. The at least one external guide wire has an attachment member for attaching to an internal guide wire catch that is slidably contained inside the catheter, whereby manipulation of the guide wire causes motion in the distal end of the catheter. The catheter assembly can be articulated within an internal cavity of a patient to more completely and accurately fill and/or drain the cavity during, for example, peritoneal dialysis.
