Abstract: An output circuit for use in an implantable cardiac defibrillation provides an output pulse having a waveform of virtually any desired shape. The device includes a sensing circuit that senses cardiac activity. An arrhythmia detector detects fibrillation responsive to the cardiac activity signal. The device further includes an output circuit that provides a stimulation output pulse when the arrhythmia detector detects a cardiac arrhythmia. The output circuit includes an H-bridge having a pair of switching devices which control the output pulse waveform with pulse-width modulation and a second pair of switching devices that control the output pulse polarity.

Abstract: An implementation of a technology, described herein, for implantable medical therapy devices and techniques related to gathering and processing data field-collected by such implantable medical therapy devices. With an ICTD system and a central database, at least one embodiment of the invention, described herein, collects and analyzes data—which includes historical cardiac-status-and-treatment information—for a specific patient and adjusts a patient's therapy accordingly. With an ICTD system and a central database, at least one embodiment of the invention, described herein, collects and analyzes data—which includes historical cardiac-status-and-treatment information—for a patient population and adjusts a patient's therapy accordingly. This abstract itself is not intended to limit the scope of this patent. The scope of the present invention is pointed out in the appending claims.