A medical device may be provided for insertion into a body of a patient. The medical device includes an elongate member made of a first material. The elongate member includes a first lumen and a second lumen. The second lumen defines a chamber within the second lumen. The chamber contains powdered metal. The density of the chamber differs from the density of the first material such that the chamber is distinguishable within the elongate member under a visualization technique while the elongate member is in the body of the patient.
