Tissue hydration monitor
AssigneeHydrostasis, Inc.
InventorDebbie K. Chen
Life of this patent
Estimating the term…
Abstract
A tissue hydration monitor and method includes a sensor module having a plurality of LEDs positioned to emit a plurality of different wavelengths of light toward the user's skin and a detector that detects light transmitted and reflected through the user's skin to generate signals corresponding to an intensity of detected light at each of the different wavelengths. A processor/controller module generates a baseline hydration level based on the received signals, calculates a relative hydration level, and generates an output indicative of relative hydration personalized to the user. The housing is secured against the user's skin by an adhesive patch or a strap.
Claims11
A system for monitoring personal hydration, 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 module comprising:
- a plurality of LEDs configured to emit light through one or more light transmissive windows disposed within the contact surface toward the wearer's skin, each LED emitting at a wavelength corresponding to one of a plurality of chromophores of interest;
- and
- at least one detector configured to detect 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 sensor assembly, executing an algorithm for generating a baseline hydration level based on the received signals, calculating a relative hydration level at time points within the period of time, and generating an output indicative of relative hydration at the time points;
- a communication module in electrical communication with the processor/controller module;
- a power supply disposed within the housing and configured to provide power to the sensor assembly, the communication module, and the processor/controller module;
- and
- a mobile device in wireless communication with the processor/controller module, the mobile device comprising a user interface and having stored thereon an application configured to receive the output and determine a personal hydration index (PHI) for the wearer at the time points by:
- executing a calibration process 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 from the full calibration period using the average hydrated intensity values from the initial calibration period;
- and
- establishing a baseline PHI range for the wearer by calculating average normalized collected intensity values;
- calculating an activity PHI corresponding to a wearer activity period, wherein the activity PHI is determined relative to the baseline PHI;
- and
- displaying the activity PHI at the user interface.
Dependencies are inferred from the claim text.