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The Journal of Thoracic and Cardiovascular Surgery, Vol 88, 11-21, Copyright © 1984 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Investigations with an implantable, electrically actuated ventricular assist device

WF Bernhard, DG Gernes, WC Clay, FJ Schoen, R Burgeson, RC Valeri, AJ Melaragno and VL Poirier

A permanent, implantable, circulatory support system for patients with irreversible cardiomyopathy is gradually becoming a reality. Progress has been achieved toward formation of a stable, nonthrombogenic, blood- prosthesis interface, and an electrically actuated ventricular assist device has reached an advanced stage of fabrication. The two most important components of the system, an electromechanical energy converter and a contiguous, pusher-plate, blood pump (stroke volume 85 ml) were employed in these studies. The energy converter consisted of a 50 volt, low-speed, brushless, torque motor and a mechanism to convert rotary motion into a pulsatile output. An electronic controller and variable-volume compliance chamber were not evaluated. Left ventricular bypass experiments were conducted in 13 calves for periods of 30 to 149 days. Preoperatively, four devices were inoculated with bovine, fetal fibroblasts to accelerate formation of a collagenous lining, and nine nonseeded pumps served as controls. The collagen-lined devices functioned for longer periods of time with unrestricted blood flow and no thromboembolic complications when compared to the control devices. Additional studies are contemplated employing a complete VAD system prior to undertaking preclinical trials.


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J. N. Nanas, C. T. Lolas, C. E. Charitos, S. N. Nanas, Z. J. Margari, E. V. Agapitos, and S. D. Moulopoulos
A VAVLELESS HIGH STROKE VOLUME COUNTERPULSATION DEVICE RESTORES HEMODYNAMICS IN PATIENTS WITH CONGESTIVE HEART FAILURE AND INTRACTABLE CARDIOGENIC SHOCK AWAITING HEART TRANSPLANTATION
J. Thorac. Cardiovasc. Surg., January 1, 1996; 111(1): 55 - 61.
[Abstract] [Full Text]


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