ABSTRACT
This report summarizes the results of the in vitro evaluation of Soviet and American artificial hearts. The devices were tested at the All-Union Institute of Transplantation and Artificial Organs, Moscow, U.S.S.R., and Baylor College of Medicine, Houston, Texas, U.S.A. These studies were designed to standardize procedures to allow comparison of artificial ventricles of different designs. Also, these studies might provide a means for evaluation of other characteristics such as hemolysis, durability, and reliability. Static and dynamic tests were performed, varying preload, afterload, rate, and systolic and diastolic time intervals. All designs demonstrated comparable function curves with capability of taking over the pressure and volume work of the natural heart.
Subject(s)
Heart, Artificial/standards , Hemodynamics , Blood Flow Velocity , Cardiac Output , Evaluation Studies as Topic , Humans , In Vitro Techniques , Stroke Volume , Systole , USSR , United States , Ventricular FunctionSubject(s)
Heart, Artificial , Animals , Dogs , Heart, Artificial/adverse effects , Hemodynamics , HemolysisABSTRACT
A new type of a ventricle pump incorporated in an arterial blood line of the artificial circulation device has been designed. A poor pulsatile flow generated by the artificial circulation system is transformed by the pump into one characterized by marked fluctuations. It may be synchronized with heart cycle phases, if necessary. Basic principles of the method as well as the circuit of the device and its arrangement within the artificial circulation system are considered.
Subject(s)
Assisted Circulation/instrumentation , Arteries , Cardiac Surgical Procedures/instrumentation , Humans , PulseABSTRACT
The results of experimental studies of hydrodynamics in acute drainage are described. Four series of experiments were carried on a transparent model filled with a liquid. The authors have revealed the phenomenon of dyraulic "strokes" which promote mechanical purification of the cavity from the purulent content. It has been established that a running-water fractional regimen of washing should be used for the cavities of more than 15--20 cm3 volume.
