公开(公告)号：EP1455897A2

公开(公告)日：2004-09-15

申请号：EP02804520.1

申请日：2002-12-03

申请人： Medtronic, Inc.

发明人： HAVEL, William, J. ,  DEGROOT, Paul, J. ,  SINNER, Thomas, W. ,  KUEHN, Kevin ,  KEMMETMUELLER, Gary ,  WOLD, Warren, W.

IPC分类号： A61N1/39

CPC分类号： A61N1/3906 ,  A61N1/3912 ,  A61N1/3937

摘要： The present invention outlines structures and methods for delivering a controllable amount of energy to a patient by automatically compensating for the load impedance detected by an implantable-cardioverter defibrillator (ICD). The invention employs high speed, switching power converter technology for the efficient generation of high energy, arbitrary waveforms. Unlike a linear amplifier, switching power converters deliver high-energy waveforms with an efficiency that is independent of the size and amplitude of the desired waveform. An ICD that uses a switching power converter to deliver the desired energy to the patient stores the energy to be delivered in a storage capacitor. The converter then transforms this energy into an arbitrarily shaped output voltage-controlled or current-controlled waveform by switching the storage capacitor in and out of the output circuit at a high rate of speed. Preferably, the waveform comprises a ramp-type waveform.