Dialyser with measuring devices for monitoring the blood pressure, method of determining the blood pressure and a storage medium for use in a dialyser

Abstract

The invention relates to a dialyser having a blood-pressure measuring unit assigned to the dialyser, a pulse-wave-transit-time measuring system assigned to the dialyser and an evaluation unit, the evaluation unit being configured such that a signal representing the blood pressure can be derived from this pulse wave transit time; the parameters describing the relationship between the pulse wave transit time and the blood pressure can be determined from a plurality of measurements made by the blood-pressure measuring unit and simultaneous measurements made by the pulse-wave-transit-time measuring system, it being possible to determine at least two of these pairs of measured values at times when the absolute and/or the relative pulse-wave-transit-time deviation is above a threshold value. The invention relates further to a method of determining the parameters describing the relationship between a pulse-wave-transit-time signal and a blood-pressure-measurement signal, a signal representing the blood pressure subsequently being derived from the pulse wave transit time; the parameters describing the relationship between the pulse wave transit time and the blood pressure are determined from blood-pressure-measurement-signal values and simultaneous pulse-wave-transit-time values, at least two of these pairs of measured values being obtained at points in time when the absolute and/or the relative deviation of the pulse wave transit time and/or of the blood pressure is above a threshold value.