Patent ID: 7803122

Claim:
Device for determining the transition between systole and diastole within a pulse cycle, having an input channel for reading in a pressure signal that can change over time and at least approximately corresponds to the aorta pressure of a patient, as a function of the time P(t), and a calculation unit that has differentiation means for forming the second derivation y″ from the function P(t), as well as evaluation means for determining a location of maximal curvature of the function P(t) in a determination range between the maximal and the minimal function value of the pulse cycle as the location of the transition between systole and diastole, and furthermore having differentiation means for forming the first derivation y′ from the function P(t), wherein the location of maximal curvature is defined for the evaluation means as the location of the smallest radius of curvature (1+ y′ 2 ) 3/2 /y″.