Design of Anti-interference Defibrillator with Short Delay

Ventricular fibrillation, atrial fibrillation, and other malignant arrhythmias are the main causes of human death. Defibrillator is an effective device to terminate abnormal heart rhythms and to deliver an electric shock to control heart activity. However, most existing defibrillation devices can only treat ventricular fibrillation and cannot handle abnormal rhythms such as atrial fibrillation that require synchronized defibrillation. A few devices that can perform synchronous defibrillation also have some obvious drawbacks, including significant synchronization time delay and limitations in reliability and anti-interference. In this study, we designed a novel synchronous defibrillator with high anti-interference and short delay for treating abnormal heart rhythms that require synchronous defibrillation. This defibrillator could collect electrocardiogram signals in real-time, recognize the R-waves, and release defibrillation energy at appropriate time. The discharge of this device occurred in the absolute refractory period of the heart, rather than during the ventricular vulnerable period near the peak of the T wave. The experimental results showed that this new synchronous defibrillator accurately recognized the R waves even in severe baseline drift and high-frequency interference situations. The synchronous defibrillator only took 1ms to recognize the R-wave and complete the discharge, significantly lower than the other commercialized defibrillators. This innovative defibrillator can be used in multiple scenarios of emergency and may promote the first-aid capacity for cardiovascular disorders.