US 11,690,567 B2
Tissue hydration monitor
Debbie K. Chen, San Diego, CA (US)
Assigned to HYDROSTASIS, INC., San Diego, CA (US)
Filed by Hydrostasis, Inc., San Diego, CA (US)
Filed on Apr. 1, 2021, as Appl. No. 17/220,843.
Application 17/220,843 is a continuation of application No. 16/395,148, filed on Apr. 25, 2019, granted, now 10,966,655.
Claims priority of provisional application 62/663,926, filed on Apr. 27, 2018.
Prior Publication US 2021/0361231 A1, Nov. 25, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/00 (2006.01)
CPC A61B 5/4875 (2013.01) [A61B 5/0075 (2013.01); A61B 5/443 (2013.01); A61B 5/6831 (2013.01); A61B 5/6833 (2013.01); A61B 5/746 (2013.01); A61B 5/4261 (2013.01); A61B 5/6813 (2013.01); A61B 5/7267 (2013.01); A61B 5/7278 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A hydration monitoring system, comprising:
a sensor assembly configured to be disposed within a housing having a contact surface configured to be secured against a wearer's skin, the sensor assembly comprising:
a plurality of LEDs configured to sequentially emit pulses of light through one or more light transmissive windows disposed within the contact surface toward the wearer's skin, each LED emitting at a discrete wavelength corresponding to one of a plurality of chromophores of interest;
at least one detector configured to sequentially detect pulses of light emitted by each LED, wherein the light is transmitted into, partially absorbed and reflected through the wearer's skin over a period of time, and generate signals corresponding to an intensity of detected light at each wavelength, wherein the detected light is received via the one or more light transmissive windows;
a processor/controller module configured for receiving signals from the at least one detector, at time points within the period of time;
a communication module in electrical communication with the processor/controller module; and
a power supply disposed within the housing and configured to provide power to the sensor assembly; and
an application configured to receive the signals and determine a personal hydration index (PHI) for the wearer at the time points by:
calculating average hydrated intensity values for the plurality of LEDs over an initial calibration period after wearer hydration;
collecting intensity values over a full calibration period;
normalizing the collected intensity values using the average hydrated intensity values; and
calculating average normalized collected intensity values to establish a baseline PHI for the wearer;
wherein the PHI at the time points is determined relative to the baseline PHI, and wherein the application is further configured to display the PHI at a user interface associated with the application.