Patent ID: 6968230
Filing Date: 2005-11-22
Classification: A61N

Abstract:
1. A circuit for use in an external unit that generates a defibrillation pulse in a defibrillation mode and a pacing pulse in a pacing mode, the circuit comprising: at least one energy storage device having a first electrode and a second electrode; a charging circuit coupled to the energy storage device, wherein the charging circuit is configured to charge the energy storage device; an energy transfer circuit coupled to the energy storage device, the energy transfer circuit having a first output lead and a second output lead, and also having a plurality of output switches including one or more SCR switches in an H-bridge circuit having a first leg, a second leg, a third leg, and a fourth leg, wherein the energy transfer circuit is configured to switch the plurality of output switches to selectively electrically couple the first and second electrodes of the energy storage device to the first and second output leads; and a control circuit coupled to the charging circuit and the energy transfer circuit, wherein the control circuit is configured to control the energy transfer circuit to couple the first and second electrodes of the energy storage device to the first and second output leads of the energy transfer circuit such that: