Efficient generation of sensing signals in an implantable medical device such as a pacemaker or ICD

摘要

An implantable cardiac device such as a pacemaker or an implantable cardioverter defibrillator (ICD) that stores a broad band electrogram signal in response to the detecting of a particular cardiac event. The system includes an external programmer which is capable of accessing the stored electrogram via a telemetry circuit so that the stored electrogram can be downloaded and reviewed on a display of the external programmer. The external programmer is also equipped with a digital filter emulator that is capable of emulating the filtering of the broad band electrogram signal that is being provided to the processor of the implanted cardiac device. The emulator therefore allows a treating physician to review an emulation of the waveform that the processor of the implanted cardiac device is seeing when the processor is initiating the delivery of therapeutic electrical stimulation to the heart.