US 12,245,847 B2
Microcirculation detection system and method
Wei-Ru Han, Hsin-Chu County (TW); and Chih-Yuan Chuang, Hsin-Chu County (TW)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on Mar. 8, 2022, as Appl. No. 17/689,342.
Application 17/689,342 is a division of application No. 16/355,864, filed on Mar. 18, 2019, granted, now 11,311,203.
Application 16/355,864 is a continuation in part of application No. 15/996,652, filed on Jun. 4, 2018, granted, now 11,020,013.
Application 15/996,652 is a continuation in part of application No. 14/955,463, filed on Dec. 1, 2015, granted, now 10,478,080.
Claims priority of provisional application 62/587,114, filed on Nov. 16, 2017.
Claims priority of application No. 104103138 (TW), filed on Jan. 29, 2015; and application No. 104116752 (TW), filed on May 25, 2015.
Prior Publication US 2022/0183577 A1, Jun. 16, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/026 (2006.01); A61B 5/00 (2006.01); A61B 5/01 (2006.01); A61B 5/0295 (2006.01); A61B 5/024 (2006.01); A61B 5/11 (2006.01)
CPC A61B 5/0261 (2013.01) [A61B 5/015 (2013.01); A61B 5/0295 (2013.01); A61B 5/4848 (2013.01); A61B 5/4884 (2013.01); A61B 5/7235 (2013.01); A61B 5/742 (2013.01); A61B 5/02416 (2013.01); A61B 5/1118 (2013.01); A61B 2562/046 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A microcirculation detection system, comprising:
a light source configured to irradiate light to illuminate a skin area;
a heating device configured to heat the skin area within a heating period;
a photosensitive array configured to detect outgoing light from the skin area and output a plurality of PPG signals;
a processing unit configured to
convert the plurality of PPG signals to an array energy distribution,
identify a first arc-like pattern in the array energy distribution at a first time point and a second arc-like pattern in the array energy distribution at a second time point, and
identify whether a frequency variation of an oscillation frequency, of oscillating between the first arc-like pattern and second arc-like pattern has a peak respectively within a first time interval and a second time interval of the heating period to detect a biphasic blood flow response to heat; and
a display, wherein the processing unit is further configured to control the display to show the first and second arc-like patterns, and the frequency variation within the heating period.