ABSTRACT
Automatic control systems for the artificial heart (AH) and ventricular assist device were developed using selected criteria of effectiveness, a mathematical model of regulation, and noninvasive measures of the hemodynamic parameters. The Sinus IS2 system was developed for control of the AH; its main component is a high-speed servomechanism that provides for the generation of pneumatic pulses. The servomechanism is controlled by automatic regulation with pressure feedback. Mean aortic pressure was used as the primary regulated hemodynamic parameter. The systems were tested using both a physical model and a physiologic experiment. Contractile insufficiency of the left ventricle was simulated in testing the control system for circulatory assistance. The studies demonstrate that automatic control systems function effectively by providing normal blood circulation in both the resting state and in certain transient processes occurring in a real, dynamic circulatory system.
Subject(s)
Assisted Circulation , Heart, Artificial , Heart-Assist Devices , Biomedical Engineering , Hemodynamics , Humans , Models, Cardiovascular , Models, Theoretical , Prosthesis DesignABSTRACT
The control system, type "Sinus", for an artificial heart is proposed. The use of servomechanisms in this system allows one to obtain pressure pneumopulses of any required form. The form of pneumopulses can be determined either by an external source, e. g. and analog computer, or by a built-in generator forming an electric control signal having one of three possible forms. The structural diagram of the type "Sinus" system and its brief technical specifications are given.
Subject(s)
Heart, Artificial , Animals , Computers, Analog , Electronics, Medical/instrumentationABSTRACT
To develop a system for the artificial heart control the algorhythm of the latter, with the blood pressure in the aorta acting as a regulation parameter, was analyzed on its mathematical model. The results of the algorhythm operation in three model situation describing transitional processes under physical efforts, stress and resuscitation are reported. The technical implemetation of the described algorhythm is set forth and a comparison of the obtained experimental data versus the design curves is made.
