A catheter or other elongated member can include an elongated inner portion, an elongated outer portion, a flex circuit ribbon comprising at least one conductor, and an electrical contact. The flex circuit ribbon can be situated between the inner portion and the outer portion. The inner portion and the outer portion can be (1) affixed together between portions of the flex circuit ribbon or (2) integrally formed such that masses of the inner and outer portions are joined together between portions of the flex circuit ribbon. The electrical contact can be configured to be exposed during use. The electrical contact can be situated at, or connected to, the at least one conductor of the flex circuit ribbon.