Implantable N-phasic defibrillator output bridge circuit

Details

Inventors: Bocchi, David E.; Laackman, Jeffrey T.; Bach, Jr., Stanley M.;
Assignee: Cardiac Pacemakers, Inc. (St. Paul, MN)
Primary Examiner: Jaworski; Francis
Assistant Examiner: Manuel; George
Attorney, Agent or Firm: Fleit, Jacobson, Cohn, Price, Holman & Stern

An output bridge circuit comprising four independently controlled transistors connected between first and second electrode terminals and a defibrillation capacitor. Two of the four transistors are driven by push-pull driver circuits and connected between the capacitor and the first and second electrode terminals. The remaining two transistors are connected between the first and second electrode terminals and ground terminals. By triggering one of the transistors connected to the push-pull driver circuits and one of the transistors connected between the electrode terminals and the ground terminal, a mono-phasic, multi-phasic, or sequential defibrillation pulse can be generated by activating the appropriate transistors.

DETAILED DESCRIPTION It is a primary object of the present invention to provide an implantable defibrillator output circuit capable of delivering a multi-phasic defibrillation pulse without having to repeatedly disconnect the ground return reference terminal.
It is another object of this invention to provide an implantable defibrillator output bridge circuit wherein energy on a defibrillator capacitor can be used for the delivery of bi-phasic, tri-phasic, and sequential defibrillation pulses.
The present invention comprises an implantable defibrillator output circuit comprising a bridge configuration having four Metal Oxide Silicon Insulated Gate Transistors (MOSIGT's) and arranged with the top two transistors having transformer isolated gate drives and the bottom two transistors having turn off time control and low impedance clamping.
Furthermore, all four MOSIGT's have independent on/off control to allow for mono-phasic, bi-phasic, tri-phasic, and sequential defibrillation pulses, and permit the selection of delivery polarity as either positive or negative without having to disconnect the ground return reference.
The above and other objects and advantages will become more readily apparent when reference is made to the following description taken in conjunction with the accompanying drawings.

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