Abstract
In baroreflex mechanism, since a brain can be thought to vary cardiac output harmonizing with peripheral vascular resistance by sensing pressure variation at about 0.1Hz(this oscillation is called Mayer waves), it can be said to filter blood pressure fluctuation.On the other hand, 1/R, and ΔP control methods was developed for realizing physiological circulation of a total artificial heart(TAH). One of problems of these methods is matching cardiac output rhythm of TAH to the Mayer waves in a natural heart for steadily of blood pressure.Aortic pressure is one of input factors for these control methods, a low-pass filter is applied to for cutting noise. Therefore, it is expected to provide Mayer waves similar physiological fluctuations in cardiac output of TAH, by obtaining a filter with the same function as a brain, and using it as a filter for the input factors.As a result of analysis for hemodynamics of a TAH goat these control methods had being applied to and of a normal goat, and analysis for this of same TAH goat with different time constant of the low-pass filter, peak frequency differed between these goats, and by the time constant. The relation of the time constant and the frequency has being considered.
