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US 2004/0111123 A1Published application
Method and apparatus for cardiac shock therapy
AssigneeCardiac Pacemakers, Inc.
InventorsKurt Ware, Robert S. Harguth, Kristine M. Larsen-Kelly
Life of this patent
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Abstract
An apparatus and method for delivering defibrillation shock therapy employing a multi-terminal pulse output circuit. In such a circuit, at least three electrode lead terminals are switchably connected to the positive and negative terminals of an energy storage capacitor. By serially switching selected electrode lead terminals to the capacitor terminals, a variety of shock pulse waveforms may be generated.
Claims18
An apparatus for delivering defibrillation shock pulses, comprising:
- pulse output circuitry for delivering shock pulses, the circuitry including a storage capacitor with positive and negative terminals and further including at least three electrode lead terminals with each such electrode lead terminal switchably connected to the positive and negative capacitor terminals;
- control circuitry for switching a selected electrode lead terminal to either the positive or negative capacitor terminal to impose a capacitor voltage between electrode lead terminals and deliver a shock pulse, and,
- wherein the control circuitry is configured to output a shock pulse by serially switching a plurality of selected pairs of electrode lead terminals to selected capacitor terminals and thereby deliver a multiphasic shock pulse which varies both temporally and spatially.
Dependencies are inferred from the claim text.