Patent ID: 8428713

Claim:
An implantable apparatus, comprising: an implantable electrostimulation therapy output circuit, including: a first defibrillation supply node; a first defibrillation output node; a second defibrillation supply node; a first rectifier; a first switch having a control input configured to control a conductive state of the first switch, the first switch coupled to the first defibrillation supply node and the first defibrillation output node, and the first switch configured to controllably connect the first defibrillation supply node to the first defibrillation output node; a second switch coupled to the second defibrillation supply node, the control input of the first switch, and the first output node, the second switch configured to controllably connect the second defibrillation supply node to the first defibrillation output node through the first rectifier; wherein the second switch is configured to inhibit the first switch from connecting the first defibrillation supply node to the first defibrillation output node when the second defibrillation supply node is connected to the first defibrillation output node through the second switch; and wherein the first output node is configured to be coupled to a first implantable electrode to provide a defibrillation therapy to a heart.