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Method and apparatus for cardiac shock therapy

  • US 20040111123A1
  • Filed: 12/02/2003
  • Published: 06/10/2004
  • Est. Priority Date: 01/04/2001
  • Status: Active Grant
First Claim
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1. 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.

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