Arrangements are disclosed in which proximal portions of a marker wire (1700) are effectively secured. In one embodiment, a proximal portion of the marker wire is positioned inside a tubular member (100) that allows for slidable movement of the marker wire within the tubular member. In some embodiments, a proximal portion of the marker wire is coupled to a spring member (1060). Some embodiments also disclose a movement-resisting member (1170) having flaps (1274) that contact the surface of the marker wire and resist movement of the marker wire in one or more directions.
