ON MECHANICAL VALVE PROSTHESIS

Abstract

Cardiovascular illness treatment demand extremely various solutions from simple drugs till supporting circulation temporary devices for implanted artificial hearts. The problem of valve prosthesis quality parameters is a very sensitive one, because it must ensure not only functional but also physiological. In this paper we propose to present the dependence between valve’s diameter and its type, patient’s homodynamic characteristics and its physical activity. Also, in order to choose the appropriate diameter of a valve prosthesis one must take into account the relationship between pressure passing through valve, the temporary evolution of the blood volume and the cardiac frequency. Further, some dimensional and non-dimensional parameters that estimate the valve’s quality function are presented: the effective passing section, the effective free section, and reflux.