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 16:
17. Method for determining a blood pressure value comprising the steps of:
providing a pulsatility signal section comprising a PPG sensor and supplying a single pulsatility signal of a user, said single pulsatility signal comprising a plurality of pulses;
identifying a plurality of consecutive pulses of said single pulsatility signal and selecting only one pulse of the identified plurality of pulses;
for the selected only one pulse, calculating a time-related feature comprising a time duration within the selected only one pulse and a normalized amplitude-related feature;
calculating a blood pressure value on the basis of a blood pressure function depending on the time-related feature, the normalized amplitude-related feature, and function parameters,
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.