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research-article

HEMODYNAMICS CHARACTERISTICS OF A FOUR-WAY RIGHT-ATRIUM BYPASS CONNECTOR

[+] Author and Article Information
Elizabeth Mack

Department of Biomedical Engineering and Mechanics, Laboratory for Turbomachinery and Components, Virginia Tech, Norris Hall, Room 107, 495 Old Turner Street, Blacksburg, VA 24061
emack434@vt.edu

Alexandrina Untaroiu

Department of Biomedical Engineering and Mechanics, Laboratory for Turbomachinery and Components, Virginia Tech, Norris Hall, Room 107, 495 Old Turner Street, Blacksburg, VA, 24061
alexu@vt.edu

1Corresponding author.

ASME doi:10.1115/1.4040214 History: Received September 07, 2017; Revised April 30, 2018

Abstract

The surgical procedure followed by the majority of cardiac surgeons to address right ventricular dysfunction is the Fontan procedure. However, this is not the most efficient configuration from a hemodynamics perspective. The goal of this study was to develop a patient-specific 4-way connector to bypass the dysfunctional right ventricle and augment pulmonary circulation. By creating a connector with proper hemodynamic characteristics, one can control the jet flow interactions between the inferior and superior vena cava and streamline the flow towards the right and left pulmonary arteries. This study focused on creating a system that could identify the optimal configuration for the 4-way connector for patients from 0-20 years of age. A platform was created in ANSYS that utilized the DOE function to minimize power-loss and blood damage propensity in the connector based on junction geometries. A CFD model was created to simulate the blood flow through the connector. The geometry of the bypass connector was parameterized for the DOE process using the inlet and outlet diameters, corner radius, and length of the connector pathways. The chosen range for each geometric parameter was based on the relative size of the patient's arteries found in the literature. It was confirmed that as the patient's age and artery size change, the optimal size and shape of the connector also changes. It was also found that power losses within the connector decrease and average and maximum blood traversal time through the connector increased for increasing opening radius.

Copyright (c) 2018 by ASME
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