Electromagnetic shield for a passive electronic component in an active medical device implantable lead

An active fixation tip electrode disposed at a distal end of an implantable lead configured to be permanently or removably connectable to an active implantable medical device, comprising:

• a) an extendable and retractable helix coil electrode contactable with biological fluid or tissue;
• b) a bandstop filter disposed in series near, at or within the helix coil electrode, the bandstop filter comprising a self-resonant inductor having an inductance in parallel with a capacitance;
• c) a conductor attached in series to the bandstop filter and disposed opposite the helix coil electrode;
• and
• d) an electromagnetic shield at least partially surrounding the bandstop filter.

An active fixation tip electrode, comprising:

• a) a helix coil electrode contactable with biological tissue disposed at a distal end of an implantable lead;
• b) a bandstop filter disposed in series near, at or within the helix coil electrode, the bandstop filter comprising a self-resonant inductor, wherein a bandstop filter inductance comprises a coiled or spiral inductor, and wherein a bandstop filter capacitance comprises a parasitic capacitance between adjacent turns of the coiled or spiral inductor;
• c) a conductor attached in series to the bandstop filter opposite the helix coil electrode, the conductor electrically connected to the implantable lead;
• and
• d) an electromagnetic shield substantially surrounding the bandstop filter.

An active fixation tip electrode, comprising:

• a) a helix coil electrode connectable with biological tissue disposed at a distal end of an implantable lead;
• b) a passive electrical component comprising a self resonant inductor bandstop filter having an equivalent electrical schematic wherein an inductance is in parallel with a capacitance disposed in series near, at or within the helix coil electrode;
• and
• c) a conductor attached in series to the passive electrical component opposite the helix coil electrode, the conductor electrically connected to the implantable lead;
• d) wherein the passive electrical component comprises an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz, such that the passive electrical component attenuates RF current flow.