Premium
Intravascular Mechanical Cavopulmonary Assistance for Patients With Failing Fontan Physiology
Author(s) -
Bhavsar Sonya S.,
Kapadia Jugal Y.,
Chopski Steven G.,
Throckmorton Amy L.
Publication year - 2009
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.2009.00940.x
Subject(s) - impeller , diffuser (optics) , medicine , central venous pressure , hemodynamics , ventricular assist device , axial flow pump , blood flow , inferior vena cava , cardiology , materials science , blood pressure , biomedical engineering , surgery , mechanics , heart failure , physics , heart rate , light source , variable displacement pump , reciprocating pump , optics
To provide a viable bridge‐to‐transplant, bridge‐to‐recovery, or bridge‐to‐surgical reconstruction for patients with failing Fontan physiology, we are developing a collapsible, percutaneously inserted, magnetically levitated axial flow blood pump to support the cavopulmonary circulation in adolescent and adult patients. This unique blood pump will augment pressure and thus flow in the inferior vena cava through the lungs and ameliorate the poor hemodynamics associated with the univentricular circulation. Computational fluid dynamics analyses were performed to create the design of the impeller, the protective cage of filaments, and the set of diffuser blades for our axial flow blood pump. These analyses included the generation of pressure–flow characteristics, scalar stress estimations, and blood damage indexes. A quasi‐steady analysis of the diffuser rotation was also completed and indicated an optimal diffuser rotational orientation of approximately 12°. The numerical predictions of the pump performance demonstrated a pressure generation of 2–25 mm Hg for 1–7 L/min over 3000–8000 rpm. Scalar stress values were less than 200 Pa, and fluid residence times were found to be within acceptable ranges being less than 0.25 s. The maximum blood damage index was calculated to be 0.068%. These results support the continued design and development of this cavopulmonary assist device, building upon previous numerical work and experimental prototype testing.