Flow behavior within the 12-cc Penn State pulsatile pediatric ventricular assist device: an experimental study of the initial design

Artificial Organs
Keefe B ManningSteven Deutsch

Abstract

Planar particle image velocimetry was used to explore the flow behavior of the newly designed 12-cc Penn State pneumatic pediatric assist pump. Wall shear maps complemented the velocity data. Bjork-Shiley Monostrut 17-mm mechanical heart valves were used in the inlet and outlet ports. In comparison with larger Penn State pumps, the 12-cc device is not only smaller but has reduced valve effective orifice areas and more highly angled valve ports. In contrast to results from the larger pumps, the flow field was highly three dimensional during early diastole with poorer penetration by the valve inlet jet. This led to a later start to a "wall washing" rotational pattern. A significant separation region, never before observed, was created upstream of the outlet valve leaflet during late diastole--effectively reducing the area and increasing the pressure drop through the valve. Wall shear maps suggest that regions of low shear might persist throughout the cycle at the bottom of the pump on the outlet side. An attempt to improve the flow field characteristics by exploring different valves, valve orientations and inlet valve angles, systolic/diastolic flow timing, and perhaps a larger outlet valve was planned.

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Citations

Nov 26, 2009·Annals of Biomedical Engineering·Breigh N RoszelleKeefe B Manning
Feb 5, 2010·Annals of Biomedical Engineering·D BluesteinK B Manning
Mar 16, 2011·Annals of Biomedical Engineering·Breigh N RoszelleKeefe B Manning
Aug 30, 2012·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Markus SchönbergerKeefe B Manning
Feb 28, 2009·Artificial Organs·Paul S Malchesky
May 8, 2010·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Hwansung LeeYoshiyuki Taenaka
Jan 27, 2019·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Branka LukicWilliam J Weiss
Aug 30, 2012·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Yanjiao XuanBin Gao
Jun 19, 2010·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Breigh N RoszelleKeefe B Manning

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