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直流心脏除颤器所用峰值电流量级为60A,持时为4～10ms。除颤所需要的大部分能量必须在极短时间内给出。为此,用电容器通过电感放电来提供所要求的波形。一、除颤要求 Peleska(1960)认为最佳脉冲持时为12～16ms,然而低于10ms的脉冲也一样有效,而且也是现在常用的Lowm等(1966)。虽然电流是心肌纤维易激膜的刺激因素,但是通常仍是用能量来表示抗电击强度的参数。大多数除颤器用“焦耳”来刻度,新近文献(Tacker等1974,Geddes 1976)指出所需要的电击强度是病人体重的函数;因
DC defibrillator peak current used in the magnitude of 60A, holding time of 4 ~ 10ms. Most of the energy needed for defibrillation must be given in a very short period of time. To do this, capacitors are used to provide the required waveforms by inductive discharge. First, the defibrillation requirements Peleska (1960) that the best pulse duration of 12 ~ 16ms, however less than 10ms pulse is equally effective, but also now commonly used Lowm et al. (1966). Although current is a stimulating factor in the muscle fibers’ deflagration membrane, it is usually still a parameter that uses energy to represent the intensity of the shock. Most defibrillators use “Joules” to scale, and recent literature (Tacker et al. 1974, Geddes 1976) indicates that the required electric shock intensity is a function of the patient’s body weight;