Surgery – Truss – Pad
Patent
1991-11-20
1993-07-06
Howell, Kyle L.
Surgery
Truss
Pad
128734, A61N 139
Patent
active
052244750
ABSTRACT:
An implantable defibrillator provided with a plurality of defibrillation electrodes, which may be reconfigured to define a plurality of defibrillation pathways. The device is capable of measuring the impedance along a selected defibrillation pathway, during delivery of an impedance pulse, and monitoring the success or failure of the pulse to accomplish defibrillation or cardioversion. In response to a detected failure to accomplish cardioversion in conjunction with a measured change of impedance of greater than a predetermined amount, a new defibrillation pathway is selected, which may employ some or all of the electrodes employed to define the original impedance pathway. The device also includes apparatus for varying the relative amplitude of defibrillation pulses applied to individual electrodes used in sequential or simultaneous, multiple electrode pulse regimens, in order to equalize current distribution, in response to measured pathway impedances.
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Berg Gary L.
Neumann Robert A.
Peterson David K.
Rossing Martin A.
Duthler Reed A.
Howell Kyle L.
Medtronic Inc.
Patton Harold R.
Schaetzle Kennedy J.
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