Making chaos with an artificial heart system

If chaotic dynamics are useful for creatures, we must consider its application to the Total Artificial Heart (TAH) system. We tried to make chaos in an electrical circuit model and Moc circulation and acute and chronic animal experiments using TAH automatic control algorithm. If we consider from a viewpoint of artificial heart control, baroreflex delay means the control delay of an artificial heart. Firstly, chaotic dynamics were observed in an electric simulation model with some time delay. We confirm the achievement of chaotic dynamics in an artificial heart circulation with automatic control algorithm simulating baroreflex system in the chronic animal experiments. The reconstructed attractor of the artificial heart pump output in chronic animal experiments under awake condition suggests the formation of a strange attractor in the phase space during automatic TAH control algorithm, and the positive largest Lyapunov exponents suggest a chaotic system. Our results suggest that we can achieve chaotic dynamics by the use of the TAH automatic control algorithm, similar to the baroreflex system