US 11,911,179 B2
Hydration assessment system
Mark Ries Robinson, Albuquerque, NM (US); Elena A Allen, Albuquerque, NM (US); Cole Derby, Santa Clara, CA (US); Akifusa Nakazawa, Mountain View, CA (US); Haiping Liao, Chicago, IL (US); and Michael Chad Makay, Santa Clara, CA (US)
Assigned to Medici Technologies LLC, Albuquequerque, NM (US)
Filed by Medici Technologies LLC, Albuquerque, NM (US)
Filed on Jul. 20, 2022, as Appl. No. 17/869,093.
Application 17/869,093 is a continuation of application No. 17/049,508, granted, now 11,471,102, previously published as PCT/US2020/038825, filed on Jun. 19, 2020.
Claims priority of provisional application 62/864,465, filed on Jun. 20, 2019.
Prior Publication US 2022/0361813 A1, Nov. 17, 2022
Int. Cl. A61B 5/00 (2006.01); G16H 40/63 (2018.01); A61B 5/02 (2006.01); A61B 5/0205 (2006.01); A61B 5/024 (2006.01); A61B 5/11 (2006.01)
CPC A61B 5/4875 (2013.01) [A61B 5/0205 (2013.01); A61B 5/02028 (2013.01); A61B 5/486 (2013.01); A61B 5/6826 (2013.01); A61B 5/6843 (2013.01); A61B 5/7278 (2013.01); A61B 5/7282 (2013.01); G16H 40/63 (2018.01); A61B 5/02416 (2013.01); A61B 5/1116 (2013.01); A61B 5/742 (2013.01); A61B 5/7405 (2013.01); A61B 5/7455 (2013.01); A61B 2562/0219 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for determining a current hydration status of a user, comprising:
(a) acquiring a signal from a wearable sensor, where the sensor is configured to detect changes in blood volume in a measurement region of the user, where the changes are indicative of opening and closing of the user's aortic valve, while the user is in one or more distinct postures;
b) providing an analysis system to determine from the signal (1) an ejection time from an aortic valve opening until a subsequent aortic valve closing and (2) an interbeat interval from an aortic valve opening until a subsequent aortic valve opening;
(c) providing a hydration determination model configured to determine a hydration status of the user from one or more ejection times and one or more interbeat intervals;
(d) using the hydration determination model to determine the current hydration status of the user;
(e) communicating the current hydration status to the user.