US 11,744,526 B2
Apparatus and method for estimating blood pressure
Ui Kun Kwon, Hwaswong-si (KR); and Chang Soon Park, Chungju-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Gyeonggi-do (KR)
Filed on Mar. 9, 2022, as Appl. No. 17/690,615.
Application 17/690,615 is a continuation of application No. 16/409,128, filed on May 10, 2019, granted, now 11,298,086.
Claims priority of application No. 10-2018-0118825 (KR), filed on Oct. 5, 2018.
Prior Publication US 2022/0192607 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/029 (2006.01); A61B 5/00 (2006.01); A61B 5/02 (2006.01); A61B 5/021 (2006.01)
CPC A61B 5/7278 (2013.01) [A61B 5/02007 (2013.01); A61B 5/029 (2013.01); A61B 5/02116 (2013.01); A61B 2560/0223 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An apparatus for estimating blood pressure, the apparatus comprising:
a photoplethysmogram (PPG) sensor configured to measure a bio-signal from a user at a measurement time; and
a processor configured to:
extract, from the bio-signal, a cardiac output (CO) feature value and a total peripheral resistance (TPR) feature value,
in response to determining that the user is in a non-stable state based on a heart rate change of the user that is monitored at a same time as the blood pressure is estimated, obtain a CO variation in the CO feature value between the measurement time and a reference time, a TPR variation in the TPR feature value between the measurement time and the reference time, and a product of the CO variation and the TPR variation,
adaptively determine a combination coefficient for combining the CO variation, the TPR variation, and the product of the CO variation and the TPR variation, based on a reference value associated with vascular compliance, and
estimate a blood pressure by combining the CO variation, the TPR variation, and the product of the CO variation and the TPR variation, using the combination coefficient.