[Study on modeling, simulation, and sensorless feedback control algorithm of the cavopulmonary assist device based on...

Area of Science:

• Biomedical Engineering
• Pediatric Cardiology
• Computational Fluid Dynamics

Background:

• The Fontan procedure improves quality of life for children with single ventricle physiology.
• Postoperative Fontan circulation failure presents significant clinical limitations.
• Cavopulmonary assist devices (CPAD) offer a solution to mitigate these limitations.

Purpose of the Study:

• To evaluate the efficacy of CPAD in managing Fontan circulation failure using a coupled in-silico and in-vitro model.
• To develop and assess a sensorless feedback control algorithm for CPAD to optimize cardiac output and prevent vena caval suction.
• To provide a theoretical and technical foundation for CPAD design and clinical application.

Main Methods:

• Established a coupled in-silico and in-vitro experimental model of Fontan circulation failure with CPAD.
• Developed a sensorless feedback control algorithm utilizing an extended Kalman filter to estimate cavopulmonary pressure head (CPPH).
• Implemented a gain-scheduled proportional-integral (PI) controller to regulate CPPH based on estimated values.

Main Results:

• CPAD effectively enhanced physiological perfusion in pediatric patients with single ventricle defects.
• The sensorless control algorithm successfully maintained adequate cardiac output and prevented vena caval suction.
• The study demonstrated reduced workload on the single ventricle with CPAD implementation.

Conclusions:

• CPAD is a viable solution for improving outcomes in children with Fontan circulation failure.
• The proposed sensorless feedback control algorithm offers a robust and practical method for CPAD management.
• This research supports the clinical potential and optimization of CPAD systems.