US 12,232,862 B2
Noninvasive/non-contact device and method for detecting and diagnosing sleep apnea by using IR-UWB radar
Sung Ho Cho, Seoul (KR); Seok Hyun Cho, Seoul (KR); and Sun Kang, Seoul (KR)
Assigned to IUCF-HYU (INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY), Seoul (KR)
Appl. No. 17/595,876
Filed by IUCF-HYU (INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY), Seoul (KR)
PCT Filed May 15, 2020, PCT No. PCT/KR2020/006421
§ 371(c)(1), (2) Date Nov. 29, 2021,
PCT Pub. No. WO2020/242101, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 10-2019-0063563 (KR), filed on May 30, 2019.
Prior Publication US 2022/0313113 A1, Oct. 6, 2022
Int. Cl. A61B 5/08 (2006.01); A61B 5/00 (2006.01); A61B 5/05 (2021.01)
CPC A61B 5/0826 (2013.01) [A61B 5/05 (2013.01); A61B 5/4818 (2013.01); A61B 5/7203 (2013.01); A61B 5/7275 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A device for detecting and diagnosing sleep apnea, the device comprising:
a signal acquisition unit configured to acquire clutter subtraction signals by removing a clutter signal from reception signals received when impulse signals are emitted from one or more impulse radio ultra-wideband (IR-UWB) radars disposed at predetermined positions and are reflected;
a respiration signal extraction unit configured to determine a position at which a change is greatest in the plurality of clutter subtraction signals acquired during a predetermined signal acquisition period, extract the clutter subtraction signal at the determined position to acquire a respiration signal that is a respiration waveform signal, and detect a local maximum value and a local minimum value that are peaks of the respiration signal;
a threshold value setting unit configured to accumulate deviations between the local maximum value and the local minimum value to set a first threshold value that is a criterion for a normal state, set a first weight for determining a start of an apnea state according to a change in the local maximum value or the local minimum value, set a second weight for determining an end of the apnea state according to a change in the number of the local maximum values and the local minimum values obtained during a predetermined reference time period, and set a second threshold value, which is a criterion for determining the apnea state, from the first threshold value and the first and second weights; and
a detection diagnosis unit configured to compare the deviation with the second threshold value to detect the apnea state and diagnose a level of sleep apnea of an examinee based on the number of times of the detected apnea state.