Abstract: An apparatus includes a navigational guidewire and a suction device. The navigational guidewire includes a sensing element, an outer member and a conductor. The sensing element is configured to respond to positioning within an electromagnetic field. The conductor extends along the length of the outer member and is in communication with the sensing element. The shaft assembly has an open distal end. The shaft assembly also defines a suction lumen and a guidewire lumen extending through the open distal end. The guidewire lumen is dimensioned to receive the sensing element of the navigational guidewire.