Patent ID: 8670841

Claim:
An implantable lead configured to be removably connectable to an active implantable medical device, the implantable lead comprising: a) a conductor having a length extending from a proximal end to a distal end; b) a distal electrode contactable with biological cells inside a human body, the distal electrode being electrically connected to the distal end of the conductor; c) a bandstop filter disposed in series along the length of the conductor, the bandstop filter comprising a self-resonant inductor having an equivalent circuit comprising an inductance in parallel with a parasitic capacitance; and d) an electromagnetic shield substantially surrounding the bandstop filter, e) wherein the bandstop filter comprises a first resonant center frequency when not in the surrounded relationship with the electromagnetic shield and a second, higher resonant center frequency when in the surrounded relationship with the electromagnetic shield, f) wherein at least one of the inductance and the parasitic capacitance is adjusted to account for a frequency shift between the first and second resonant center frequencies, g) wherein the second resonant center frequency is about 63.84 MHz, h) wherein the frequency shift between the first and second resonant center frequencies is greater than 4.3MHz or 6.8% of the about 63.84 MHz, and i) wherein the bandstop filter comprises a circuit Q, wherein the resultant 3 dB bandwidth is at least 100 kHz, such that when in the surrounded relationship with the electromagnetic shield, the bandstop filter attenuates RF current flow substantially about the second resonant center frequency.