US 12,433,496 B2
Vital sign detection apparatus and system and data processing method
Yongxin Guo, Singapore (SG); Bo Wang, Singapore (SG); and Zhi Zheng, Singapore (SG)
Assigned to NATIONAL UNIVERSITY OF SINGAPORE, Singapore (SG); and NATIONAL UNIVERSITY OF SINGAPORE (SUZHOU) RESEARCH INSTITUTE, Jiangsu (CN)
Appl. No. 18/557,403
Filed by NATIONAL UNIVERSITY OF SINGAPORE, Singapore (SG); and NATIONAL UNIVERSITY OF SINGAPORE (SUZHOU) RESEARCH INSTITUTE, Jiangsu (CN)
PCT Filed Apr. 29, 2022, PCT No. PCT/SG2022/050266
§ 371(c)(1), (2) Date Oct. 26, 2023,
PCT Pub. No. WO2022/231525, PCT Pub. Date Nov. 3, 2022.
Claims priority of application No. 202110474401.0 (CN), filed on Apr. 29, 2021; application No. 202110476260.6 (CN), filed on Apr. 29, 2021; and application No. 202111678411.2 (CN), filed on Dec. 31, 2021.
Prior Publication US 2024/0237905 A1, Jul. 18, 2024
Int. Cl. A61B 5/021 (2006.01); A61B 5/00 (2006.01); A61B 5/05 (2021.01); G01S 7/292 (2006.01)
CPC A61B 5/02108 (2013.01) [A61B 5/05 (2013.01); A61B 5/7257 (2013.01); G01S 7/292 (2013.01); A61B 5/742 (2013.01); A61B 2562/06 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A vital sign detection device comprising:
a main body;
a plurality of sensors coupled to the main body, the plurality of sensors being configured to simultaneously detect a plurality of corresponding vital sign signals of a test subject;
a controller in data connection with the plurality of sensors; and
a first filter and a second filter,
wherein the controller being configured to receive the plurality of corresponding vital sign signals from the plurality of sensors, and to provide at least one vital sign information of the test subject based on at least one of the plurality of corresponding vital sign signals received,
the plurality of sensors includes a radar device and a video device;
the plurality of corresponding vital sign signals includes a first pulse wave signal and a second pulse wave signal;
the controller includes a radar signal processor coupled to the radar device and a video signal processor coupled to the video device;
the at least one vital sign information includes a blood pressure value;
wherein the radar device is configured to transmit a radar signal to the test subject and to receive a radar echoes from a first part of the test subject, and the radar signal processor being configured to extract the first pulse wave signal from the radar echoes;
the video device is configured to receive a video signal from a second part of the test subject, and the video signal processor being configured to extract the second pulse wave signal from the video signal stream;
the controller being configured to obtain a measured pulse wave transit time from the first pulse wave signal and the second pulse wave signal, and to match the measured pulse wave transit time with a reference pulse wave transit time to obtain the blood pressure value,
wherein the radar signal processor is further configured to demodulate in-phase signals and orthogonal signals in the radar echoes to obtain an initial radar signal, and to perform a phase compensation to the initial radar signal to obtain a complete radar signal,
wherein the radar signal processor being further configured to transform the complete radar signal from time domain to frequency domain to obtain a highest amplitude corresponding to a reference frequency; the first filter being configured to filter the complete radar signal to obtain the first pulse wave signal, wherein an upper bound frequency of the first filter is configured to vary based on the reference frequency,
wherein the video signal processor being further configured to: extract an original green channel signal from the video signal stream; remove interference signals from the original green channel signal to obtain a baseline-drift-eliminated green channel signal; set an interval upper bound of the second filter; filter the baseline-drift-eliminated green channel signal with the second filter to obtain the second pulse wave signal, wherein the interval upper bound of the second filter varies based on the reference frequency.