Design of Cardiac Status Indicator and R-R Interval Adjustment Circuits

Despite great advancements in medical field, millions of people suffer from cardiac arrhythmia. The solutions for arrhythmia rely largely on early diagnosis and recognition, and therefore in this paper, we have designed a Cardiac Status Indicator and R-R interval (RRI) adjustment circuit to continuously indicate the status of ECG and generate anti-wave to normalize the abnormal waveform for next-generation cardiac pacemakers. The design accurately detects RRI's and for RRI lesser than 0.6s, an anti-wave is generated to suppress extra heartbeats against irregular heartbeats and on the other hand, for RRI greater than 1s, an anti-wave with extra beats is generated to normalize the heartbeat. The simulation is implemented in 0.18µm CMOS process and the circuits operate in the range of 0.9V to 1.8V.