A catheter system for positioning of a medical instrument includes a first elongate member having a first lumen. The system also includes a second elongate member that includes a second lumen that receives the medical instrument. The second elongate member is coupled directly to the first elongate member, and the second elongate member is cuttable to allow removal of the medical instrument from the second lumen. The second elongate member is also selectively collapsible and expandable to change a size of the second lumen. Furthermore, the system includes a navigation tool operable for allowing detection of a location of the catheter system. The navigation tool is received in the first lumen, and the second elongate member is cuttable without cutting the first elongate member and the navigation tool.