Key result
A total artificial heart control system using estimated flow rate and pressure head demonstrated sufficient estimator accuracy and stable control in vitro and in vivo.
A sensorless control system for a total artificial heart using estimated flow and pressure is feasible and stable, potentially avoiding sensor-related thrombosis.
Sensorless total artificial heart control is feasible in animals; leaves open human translation and clinical adoption.
A total artificial heart (TAH) is not connected to the central nervous system, and then the TAH system has to determine an adequate operation by itself. Pressure and flow rate are important indices for the decision, however, embedded pressure and flow sensors tend to cause thrombus formation and their durability is insufficient. To avoid this problem, we studied the flow rate and pressure head estimation with rotational speed and supplied power using an ARX model. In this paper, we discuss about the TAH control system using the estimated value instead of the measured value. We had experiments to identify parameter of estimator and control flow rate using the estimated value instead of the measured value, in in vitro and in vivo. In the identification experiment, we could verify enough accuracy of estimator. In the control experiment, the control system was stable but a biased error between measured and estimated value was found.
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Ogawa et al. (2004) studied Total artificial heart (TAH). TAH control system using estimated flow rate and pressure head vs. Measured values was evaluated on Accuracy of estimator and control system stability. A total artificial heart control system using estimated flow rate and pressure head demonstrated sufficient estimator accuracy and stable control in vitro and in vivo.
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