US 11,832,933 B2
System and method for wireless detection and measurement of a subject rising from rest
Rumen Hristov, Cambridge, MA (US); Zachary Kabelac, Cambridge, MA (US); Hariharan Rahul, Cambridge, MA (US); and Dina Katabi, Cambridge, MA (US)
Assigned to Emerald Innovations Inc., Cambridge, MA (US)
Filed by Emerald Innovations Inc., Cambridge, MA (US)
Filed on Apr. 20, 2021, as Appl. No. 17/235,447.
Claims priority of provisional application 63/012,730, filed on Apr. 20, 2020.
Prior Publication US 2021/0321938 A1, Oct. 21, 2021
Int. Cl. A61B 5/11 (2006.01); A61B 5/00 (2006.01); G01S 7/41 (2006.01); G01S 13/34 (2006.01); G01S 13/89 (2006.01)
CPC A61B 5/1118 (2013.01) [A61B 5/11 (2013.01); A61B 5/1126 (2013.01); A61B 5/4809 (2013.01); G01S 7/41 (2013.01); G01S 13/34 (2013.01); G01S 13/343 (2013.01); G01S 13/89 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for wireless detection of a subject rising from a rest state, comprising:
a. producing transmitted wireless signals from one or more transmitting antennas;
b. receiving reflected wireless signals at one or more receiving antennas, the reflected wireless signals being reflected from the subject partially or fully;
c. processing the reflected wireless signals in a computer to estimate a lying-down area of the subject, the computer including a microprocessor and memory electrically coupled to the microprocessor;
d. processing the reflected wireless signals in the computer to determine a plurality of candidate trajectories of the subject, each candidate trajectory corresponding to a movement of the subject over a time period;
e. aligning the candidate trajectories, in the computer, with an initial template trajectory;
f. determining, in the computer, a new template trajectory using the aligned candidate trajectories;
g. determining, in the computer, whether the new template trajectory is within a predetermined distance of the initial template trajectory;
h. when the new template trajectory is greater than the predetermined distance of the initial template trajectory:
replacing the new template trajectory with the initial template trajectory; and
repeating steps e-g until the new template trajectory is within the predetermined distance of the initial template trajectory;
i. when the new template trajectory is less than or equal to the predetermined distance of the initial template trajectory:
saving the new template trajectory as a final template trajectory;
determining, in the computer, a lying-down surface exit initiation area using the aligned candidate trajectories;
determining, in the computer, a lying-down surface exit initiation area exit time for each aligned candidate trajectory using the lying-down surface exit initiation area;
determining, in the computer, a time-up-and-go (TUG) plane entry time for each aligned candidate trajectory; and
calculating, in the computer, a TUG time based on a difference between the TUG plane entry time and the lying-down surface exit initiation area exit time.