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Pulsatile Physiological Control of Blood Pump-Cardiovascular System Based on Feedforward Compensation.

Yanjun Bao1, Teng Jing1, Weimin Ru1

  • 1Research Center of Fluid Machinery Engineering & Technology, Jiangsu University, Zhenjiang 212013, China.

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Summary

This study introduces a new pulsatile physiological control for Rotary Blood Pumps (RBPs) using feed-forward compensation (FFC). This advanced control improves blood flow pulsatility, enhancing ventricular assist device performance and patient outcomes.

Keywords:
Rotary Blood Pumpcardiovascular systemfeed-forward compensationphysiologicalpulsatility

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Engineering
  • Control Systems

Background:

  • Rotary Blood Pumps (RBPs) are crucial ventricular assist devices.
  • Constant speed operation reduces blood flow pulsatility, causing adverse effects.
  • Restoring pulsatility is key to improving RBP function and patient outcomes.

Purpose of the Study:

  • To design and evaluate a pulsatile physiological control algorithm with feed-forward compensation (FFC) for RBPs.
  • To improve real-time regulation of rotational speed for accurate pulsatile blood flow output.
  • To enhance ventricular unloading and pulsatile performance compared to existing methods.

Main Methods:

  • Developed a coupled model of the RBP and cardiovascular system (CVS) in SIMULINK.
  • Designed a control algorithm combining FFC-based pulsatile control and an anti-reflux algorithm.
  • Implemented adaptive switching between control strategies based on pump flow rate thresholds.
  • Validated the system through simulations and extracorporeal circulation experiments.

Main Results:

  • FFC reduced pulsatile physiological control tracking error by 80%.
  • The system demonstrated rapid and stable tracking during a 50% physiological parameter change, preventing reflux.
  • Achieved a 30 mmHg increase in aortic beat-to-beat differential pressure in experiments.
  • Superior pulsatile and ventricular unloading performance compared to non-FFC and constant-speed controls.

Conclusions:

  • The FFC-based pulsatile physiological control effectively restores blood flow pulsatility in RBPs.
  • This control strategy significantly improves RBP performance and ventricular unloading.
  • The developed method offers a promising advancement for RBP technology and patient care.