Electrode spacing in a subcutaneous implantable cardiac stimulus device

摘要

Methods and implantable cardiac stimulus devices that include leads designed to avoid post-shock afterpotentials. Some examples are directed toward lead-electrode designs that reduce the impact of an applied stimulus on sensing attributes. These examples may find particular use in systems that provide both sensing and therapy delivery from subcutaneous location.

主权项

1. An implantable defibrillator system for subcutaneous placement comprising:
an implantable canister housing operational circuitry for sensing electrical cardiac activity and delivering electrical stimulus to correct arrhythmia; and a lead electrode assembly comprising:
a proximal connector end for coupling to the implantable canister;a distal end having a distal tip with a distal tip electrode;an elongated body extending between the proximal connector end and the distal end; anda defibrillation electrode; wherein the distal tip electrode is spaced from the defibrillation electrode by a portion of the elongated body having a length of at least nineteen (19) millimeters, with no other electrode therebetween; wherein the implantable canister is configured to enable insertion of the lead electrode assembly for operation therewith.