| 摘要 |
A pacemaker and a method of operation thereof are provided for configuring or operating a conventional pacemaker having a plurality of lead electrodes. Each lead can be independently configured for any combination of unipolar or bipolar, pacing and sensing. During a pacing mode of operation, a selected return electrode is switchably connected to the most positive battery potential, VDD. The return electrode of the packemaker, can selectively be either the pacemaker case or one or more ring electrodes. During a fast discharge time period, which occurs immediately subsequent to the delivery of a pacing pulse, the return electrode is disconnected from VDD and connected to the proximal side of a coupling capacitor through which the pacing pulse has passed. Also during this fast discharge time period, the proximal side of the coupling capacitor is switchable connected to the most negative battery potential, VSS. During sensing, one input of the sensing amplifier is connected to either the tip electrode or the ring electrode. A second input of the sensing amplifier is switchably connected to the selected return electrode, either the case or the ring electrode. Sensing can therefore occur between tip electrode and ring electrode, tip electrode and case, or ring electrode and case. Furthermore, the case electrode is switchably connected to -0.5 volts during the sensing phase of operation.
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