Pacing and cardioversion lead systems with shared lead conductors

摘要

An implantable electrical lead having an elongated insulative lead body carrying a cardioversion/defibrillation electrode and a sensing electrode spaced from the cardioversion/defibrillation electrode. A diode enclosure is mounted in the lead body between the cardioversion/defibrillation electrode and the sensing electrode, the diode enclosure having conductive end walls and including a diode or diodes therein coupled between the conductive end walls. The enclosure is also provided with a feedthrough tube extending through said enclosure, passing through the end walls. An elongated conductor extends through the lead body and through the feedthrough tube of said enclosure and is electrically coupled to the sensing electrode. The cardioversion/defibrillation electrode and the sensing electrode are each electrically coupled to one of the conductive end walls of the diode enclosure.