Patent ID: 8918189
Filing Date: 2014-12-23
Classification: A61N,G01R,H01F,H03H

Abstract:
1. An implantable lead configured to be permanently or removably connectable to an active implantable medical device, comprising: a) a conductor having a length extending from a proximal end to a distal end; b) an extendable and retractable helix coil electrode contactable with biological tissue disposed at the distal end of the conductor; c) a bandstop filter disposed in series near, at or within the helix coil electrode, the bandstop filter comprising a self-resonant insulated inductor wherein an equivalent circuit model comprises an inductance in parallel with a capacitance, wherein the bandstop filter equivalent circuit capacitance is at least partially formed from a parasitic capacitance between adjacent turns of the inductor; d) an electromagnetic shield substantially surrounding the bandstop filter, wherein the bandstop filter equivalent circuit capacitance also includes a parasitic capacitance between the adjacent turns of the coiled or spiral inductor and the shield; and e) a torque carrier attached between the distal end of the conductor and the helix coil electrode, the torque carrier disposed mechanically in parallel to the bandstop filter such that torque experienced by the helix coil electrode when inserted into the biological tissue is not transmitted to the bandstop filter; f) wherein the bandstop filter comprises an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz, such that the bandstop filter attenuates RF current flow.