Title :
Prosthetic valve selection for a pulsatile LVAD
Author :
Kovacs, S.G. ; Ondrovic, L.E. ; Connar, R.G.
Author_Institution :
James A. Haley Veterans Hospital, Tampa, FL, USA
Abstract :
During the final development period of a unique magnetically actuated LVAD, three of the most widely used clinical prosthetic valves were evaluated for LVAD use in both the inflow and outflow positions. The three valves (St. Jude, Medtronic, Bjork-Shiley), of 25 mm lumen size, were all tested in the same mock loop, with the following set of hydraulic parameters: (1) afterload systemic pressure, constant 80 mm-Hg; (2) preload pressure, ranged from 3 to 18 mmHg; (3) beat rate, from 60 to 80 b.p.m. Pump actuator power was held constant, corresponding to the specific b.p.m. rate. Results from a series of ten testings per valve clearly established no significant differences in flow output at fill pressures of 10 mmHg or greater, despite obvious differences in effective lumen cross-sectional area of each valve
Keywords :
cardiology; prosthetics; 10 mmHg; 80 mmHg; Bjork-Shiley; Medtronic; St. Jude; afterload systemic pressure; beat rate; clinical prosthetic valves; effective lumen cross-sectional area; fill pressure; flow output; hydraulic parameters; left ventricular assist device; lumen size; magnetically actuated device; pump actuator power; Actuators; Filling; Geometry; Heart valves; Hospitals; Immune system; Prosthetics; Steady-state; Surgery; System testing;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.95660
