RF currents will be induced within implanted neuro-stimulation leads when exposed to Magnetic Resonance Imaging (MRI) fields. Induced currents result in dissipative heating that manifests at the electrode/patient contact points. The ideal lead design will attenuate induced 64-MHz RF energy coming from the MRI while passing signals in the lower, intended neuro-stimulation frequency range. A Nuvectra™ SCS lead, having a helical conductor coiling design, is evaluated. Results of MRI phantom experiments demonstrate RF-induced power attenuation between -6.2 and -12.5 dB/meter when exposed to combined fields from 1.5 Tesla, 2.77 W/kg for minutes.
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