US 11,864,874 B2
Method, apparatus and computer program for determining a blood pressure value
Martin Proença, Marly (CH); Josep Sola i Caros, Corcelles (CH); Mathieu Lemay, St-Sulpice (CH); and Christophe Verjus, Neuchâtel (CH)
Assigned to CSEM CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE SA—RECHERCHE ET DÉVELOPPEMENT, Neuchâtel (CH)
Appl. No. 15/543,299
Filed by CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement, Neuchâtel (CH)
PCT Filed Jun. 18, 2015, PCT No. PCT/EP2015/063765
§ 371(c)(1), (2) Date Jul. 13, 2017,
PCT Pub. No. WO2016/138965, PCT Pub. Date Sep. 9, 2016.
Prior Publication US 2017/0360314 A1, Dec. 21, 2017
Int. Cl. A61B 5/021 (2006.01); A61B 5/00 (2006.01); A61B 5/024 (2006.01); A61B 5/0215 (2006.01); A61B 5/0535 (2021.01)
CPC A61B 5/02116 (2013.01) [A61B 5/02125 (2013.01); A61B 5/02154 (2013.01); A61B 5/02156 (2013.01); A61B 5/02416 (2013.01); A61B 5/7221 (2013.01); A61B 5/7235 (2013.01); A61B 5/7278 (2013.01); A61B 5/02108 (2013.01); A61B 5/02438 (2013.01); A61B 5/0535 (2013.01); A61B 2562/0219 (2013.01)] 19 Claims
OG exemplary drawing
 
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.