Patent ID: 11864874
Assignee: CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE SA—RECHERCHE ET DéVELOPPEMENT
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. Method for determining a blood pressure value comprising the steps of:
providing a pulsatility signal of a user, the pulsatility signal comprising a plurality of pulses;
selecting only one pulse of the plurality of pulses of the pulsatility signal;
for the selected only one pulse, determining a first feature and a second feature on the basis of the pulsatility signal; and
calculating a blood pressure value on the basis of a blood pressure function depending on the first feature, the second feature, and function parameters, the first feature being a time-related feature comprising a time duration within the selected only one pulse, and the second feature being a normalized amplitude-related feature,
wherein the calculating does not use a non-normalized amplitude-related feature,
wherein the normalized amplitude-related feature is an amplitude-related feature normalized by another amplitude-related feature,
wherein the blood pressure function further linearly depends on a user feature,
wherein the function parameters comprise a time-related coefficient, an amplitude-related coefficient, and a user coefficient,
wherein the time-related feature is multiplied with the time-related coefficient, the normalized amplitude-related feature is multiplied with the amplitude-related coefficient before summing the time-related feature with the normalized amplitude-related feature,
wherein the user feature is multiplied with the user coefficient before adding the user feature to the time-related feature and the normalized amplitude-related feature, and
wherein the time-related coefficient, the amplitude-related coefficient, and the user coefficient are determined by a calibration process comprising measuring the blood pressure of the user with an independent sensor.