The Pulse Generator
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THE FIRST ICDs, implanted in 1980, were large (162 cm3, 292 g)1 compared to the most current devices that are about 60 cm3 and 110 g. Since that time, emphasis on packaging of current ICDs has focused on the continual increase of device functions, whether it be therapies (pacing, different defibrillation modes) or features (telemetry, electrocardiogram storage, etc.), with continuing emphasis on decreasing the package size. Until recently, most devices have required abdominal implantation because of their size, as was the case with early pacemakers. Whereas pacemaker development had definite leaps in technology to allow the downsizing of that device (lithium batteries, integrated circuits, hermetic enclosures), size reduction of the ICD has been a net result of paying close attention to detail and making small reductions that have added up to the overall package efficiency.
KeywordsPulse Generator Implantable Cardioverter Defibrillator Therapy Lithium Iodide Terminal Block Defibrillation Pulse
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