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引言微电子学的迅速发展,已可以设计和生产成这样的起搏器电路,它以种治疗的实际需要出发,把该电路装入一个适当大小的可植入装置内,具有以满足患者生存希望的工作寿命。近几年来,这种进展也使新的电极概念得到了发展,对电极的长期阈值特性加以改进,会延长植入装置的工作寿命。在其寿命将终止期间;降低阈值对安全容限尤为重要。理想的刺激电极应该满足下列要求: (1)能量阈值低,以便节约能虽和防止过分的电极反应而引起的干扰,因为这种干扰会影响无关电极控制电路的正常工作。 (2)所感知的腔内心电信号应包括腔内ECG的所有频谱,以提供最佳的信噪比来区别于其它的心电信号(如PVC、逆传导、扑动和纤颤)。 (3)此外,在电路的设计中必须考虑抑制EMI(电磁干扰)和肌电。
INTRODUCTION The rapid development of microelectronics has allowed the design and manufacture of pacemaker circuits that incorporate the actual needs of therapy into an appropriately sized implantable device that meets patient survival Hope of working life. In recent years, this progress has also led to the development of a new electrode concept, which improves the long-term threshold characteristics of the electrodes and prolongs the working life of the implanted device. During the end of its life expectancy; lowering the threshold is particularly important for safety margins. The ideal stimulating electrode should meet the following requirements: (1) low energy threshold to save energy and prevent excessive electrode reaction caused by interference, because this interference will affect the normal operation of unrelated electrode control circuit. (2) The perceived intracavity signal should include all the spectra of the intracavitary ECG to provide the best signal-to-noise ratio to distinguish it from other ECG signals such as PVC, reverse conduction, flutter and fibrillation. (3) In addition, EMI (electromagnetic interference) and electromyography must be considered in the circuit design.