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Ann Thorac Surg 1999;68:790-794
© 1999 The Society of Thoracic Surgeons
a Nimbus Inc, Rancho Cordova, California, USA
b Tracor Analysis and Applied Research, Austin, Texas, USA
c McGowan Center for Artificial Organ Development, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
Address reprint requests to Mr Butler, Nimbus Inc, 2945 Kilgore Rd, Rancho Cordova, CA 95670
e-mail: kcbutler{at}pacbell.net
Presented at the Fourth International Conference on Circulatory Support Devices for Severe Cardiac Failure, Houston, TX, Oct 3–5, 1997.
Abstract
Background. Nimbus Inc, and the University of Pittsburgh’s McGowan Center for Artificial Organ Development have been collaborators on rotary blood pump technology initiatives since 1992. Currently, a major focus is an innovative ventricular assist system (IVAS) that features an implantable, electrically powered axial flow blood pump. In addition to the blood pump, a major development item is the electronic controller and the control algorithm for modulating pump speed in response to varying physical demand.
Methods. Methods used in developing the IVAS include computational fluid dynamic modeling of the pump’s interior flow field, flow visualization of the flow field using laser-based imaging, computer simulation of blood pump-physiological interactions, vibroaccoustic monitoring, and an extensive in vivo test program.
Results. Results to date, which are presented below, include successful in vivo tests of blood pumps with blood-immersed bearings, and feasibility demonstration of vibroacoustic monitoring in this application.
Conclusions. This unique blend of industrial experience and technologies with the University-based Research and Development Center has greatly enhanced the progress made on this IVAS project.
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