Patent ID: 7758520

Claim:
A medical device for use with an MRI machine, the MRI machine adapted to apply a radio frequency pulse having a wavelength which creates an image, the medical device comprising: an elongated core member, the core member including: a first conductive elongate member having a solid cross section; a second conductive elongate member comprising a tubular member, wherein an end of the first elongate member has a recess, and a mating end of the tubular second elongate member is disposed therein; a third conductive elongate member, wherein an end of the second elongate member has an opening, and a mating end of the third elongate member is disposed therein; a first joint having low electrical conductivity relative to the elongate members, wherein the first joint is situated between and adjoins the first and second elongate members; a second joint having low electrical conductivity relative to the elongate members, wherein the second joint is situated between and adjoins the second and third elongate members; wherein the length of each of the three elongate members is less than one half the wavelength of the radio frequency pulse applied by the MRI machine; and wherein the first and second joints retard the occurrence of a conductive path between the elongate members wherein the first and second joints comprise an adhesive or bonding material which has a relatively low conductivity to at least some of the elongate members.