| 摘要 |
A highly efficacious defibrillation lead system and method of use in the middle cardiac vein. The lead system includes a catheter shaft having a plurality of electrode channels and a venous electrode within each channel. A lead wire is electrically interconnected to each venous electrode and extends through the associated electrode channel to the distal end of the shaft. The lead system can be efficiently implanted in the middle cardiac vein when the electrodes are in retracted positions within the channels. After the lead system is implanted, the electrodes are moved to branched deployed positions beyond a distal end of the shaft and into a plurality of tributaries of the middle cardiac vein. The branched electrode distribution in the middle cardiac vein is achieved with relatively little trauma during deployment and enables successful defibrillation with reduced defibrillation threshold energy to enhance the overall defibrillation procedure.
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