US 11,890,081 B2
Apparatus and method for estimating blood pressure
Dae Geun Jang, Yongin-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Oct. 8, 2019, as Appl. No. 16/595,714.
Claims priority of application No. 10-2019-0004015 (KR), filed on Jan. 11, 2019.
Prior Publication US 2020/0221960 A1, Jul. 16, 2020
Int. Cl. A61B 5/021 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/02108 (2013.01) [A61B 5/7239 (2013.01); A61B 5/7242 (2013.01); A61B 5/7278 (2013.01); A61B 2560/0223 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus implemented in a wearable device worn by a user for continuously estimating blood pressure of the user, the apparatus comprising:
a pulse wave sensor, including a light sensor, configured to measure a first pulse wave signal at a time of estimating the blood pressure from the user;
a processor configured to:
differentiate or integrate the measured first pulse wave signal to obtain a reference signal;
correct the measured first pulse wave signal, based on the obtained reference signal, to obtain a second pulse wave signal, wherein correcting the measured first pulse wave signal adjusts for changing light intensity of an environment of the apparatus detected by the light sensor; and
estimate the blood pressure of the user, based on the obtained second pulse wave signal and a third pulse wave signal measured at a calibration time when the user is in a stable state, different from the time of estimating the blood pressure to provide a continuous blood pressure condition of the user; and
a display configured to display the estimated blood pressure of the user.