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Wireless Telemetry Device Implantation in a Fontan Ovine Model for Continuous and Long-Term Hemodynamic Monitoring

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Published on: May 2, 2025

Autonomous Fontan pump: Computational feasibility study.

Mark D Rodefeld¹, Timothy Conover², Richard Figliola²

¹Section of Cardiothoracic Surgery, Department of Surgery, Indiana University School of Medicine and James Whitcomb Riley Hospital for Children, Indianapolis, Ind.

|November 13, 2024

Summary

This summary is machine-generated.

This study explores a novel Fontan pump that uses systemic arterial pressure to improve blood flow in patients with single-ventricle physiology. The self-powered device shows potential for enhancing Fontan circulation efficiency and patient outcomes.

Keywords:

Fontan circulation autonomous cavopulmonary assist subpulmonary pump

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Area of Science:

Cardiovascular Engineering
Pediatric Cardiology
Biomedical Devices

Background:

Patients with single-ventricle physiology after Fontan palliation experience chronic circulatory inefficiency due to the absence of a subpulmonary ventricle.
This inefficiency contributes to the Fontan paradox, highlighting a need for improved circulatory support.

Purpose of the Study:

To investigate the feasibility of a self-powered Fontan pump designed to augment subpulmonary circulation.
To assess the potential of harnessing reserve pressure energy from the systemic arterial circulation to improve Fontan physiology.

Main Methods:

A double-inlet, double-outlet rotary pump was designed, powered by a systemic arterial shunt and radial turbine.
Computational fluid dynamics and lumped parameter modeling were employed to analyze pump integration into the Fontan circulation.

Main Results:

The proposed pump design can augment all four limbs of the total cavopulmonary connection flow.
Simulations predicted a cavopulmonary pressure rise of +2.5 mm Hg, a systemic shunt flow of 22% cardiac output, and a reduction in systemic venous pressure by 1.4 mm Hg.
Improved ventricular preload and cardiac output were observed in the models.

Conclusions:

Tapping into systemic circulation's reserve pressure energy offers a potential strategy to enhance Fontan circulatory efficiency.
Further research is essential for optimizing pump design, fabrication, and testing for hydraulic performance and hemocompatibility.
An autonomous Fontan pump could lead to a durable physiologic shift towards biventricular health, offering freedom from external power and improved quality of life.