| 摘要 |
An implantable electrical device comprising an RV coil and a pacing probe. The RV coil provides defibrillation and cardioversion waveforms to the heart and the pacing probe provides pacing signals to the heart and also acts as a sensor of the heart's intrinsic activity. The pacing probe is advantageously positioned within the apex of the heart. The device includes a controllable interconnect circuit that interconnects the RV coil and the pacing probe so that when the RV coil provides a defibrillation or cardioversion therapeutic shock to the heart, a portion of the energy provided to the RV coil is provided to the pacing probe so that an electrical shock is simultaneously provided to the apex for defibrillation or cardioversion purposes. In the preferred embodiment, a shunt resistor is positioned in series with the pacing probe so that the current being supplied to the pacing probe is limited. This protects the pacing probe from damage and also reduces the possibility that the cardiac cells surrounding the pacing probe will be stunned as a result of the pacing probe applying a therapeutic shock to the apex of the heart for defibrillation or cardioversion purposes.
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